/* ==========================================================================
   HỆ THỐNG HỌC TIẾNG TRUNG TOÀN DIỆN: GOHANZI & THÀNH CÔNG CHI LỘ
   TÔNG SÁNG: TRẮNG TINH KHÔI · HỒNG PHẤN SAKURA · XANH NGỌC & CYAN PASTEL
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Ma+Shan+Zheng&family=Noto+Sans+SC:wght@400;500;700;900&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  /* Tông màu Sáng Trắng Hồng Xanh */
  --bg-gradient: linear-gradient(135deg, #fff7fa 0%, #ffffff 35%, #f2fbf9 70%, #f0f7ff 100%);
  --bg-pure: #ffffff;
  --bg-surface: #ffffff;
  --bg-surface-glass: rgba(255, 255, 255, 0.85);
  --bg-surface-elevated: #ffffff;
  --bg-subtle: #f8fafc;

  /* Hồng Phấn (Sakura Pink) */
  --pink-primary: #ff527b;
  --pink-primary-hover: #e03a63;
  --pink-soft: #fff0f5;
  --pink-light: #ffe4ec;
  --pink-border: rgba(255, 94, 134, 0.25);
  --pink-shadow: rgba(255, 82, 123, 0.15);

  /* Xanh Biển Ngọc (Teal & Cyan & Sky Blue) */
  --cyan-primary: #0284c7;
  --cyan-soft: #f0f9ff;
  --cyan-light: #e0f2fe;
  --cyan-border: rgba(2, 132, 199, 0.25);

  --teal-primary: #0d9488;
  --teal-soft: #f0fdfa;
  --teal-light: #ccfbf1;
  --teal-border: rgba(13, 148, 136, 0.25);

  /* Chữ & Độ tương phản */
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;

  /* Viền và Bóng đổ */
  --border-light: rgba(226, 232, 240, 0.85);
  --border-pink-subtle: rgba(255, 182, 193, 0.4);
  --border-cyan-subtle: rgba(56, 189, 248, 0.3);

  --shadow-xs: 0 1px 3px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 4px 12px rgba(255, 94, 134, 0.06), 0 2px 6px rgba(2, 132, 199, 0.04);
  --shadow-md: 0 10px 25px rgba(255, 94, 134, 0.08), 0 4px 12px rgba(2, 132, 199, 0.06);
  --shadow-lg: 0 20px 40px rgba(255, 94, 134, 0.12), 0 8px 20px rgba(13, 148, 136, 0.08);

  /* Fonts */
  --font-sans: 'Plus Jakarta Sans', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-hanzi: 'Noto Sans SC', 'Microsoft YaHei', sans-serif;
  --font-calligraphy: 'Ma Shan Zheng', 'Noto Serif SC', cursive, serif;

  /* HSK Badge Colors */
  --hsk1-color: #0d9488;
  --hsk1-bg: #ccfbf1;
  --hsk2-color: #0284c7;
  --hsk2-bg: #e0f2fe;
  --hsk3-color: #7c3aed;
  --hsk3-bg: #ede9fe;
  --hsk4-color: #ea580c;
  --hsk4-bg: #ffedd5;
  --hsk5-color: #e11d48;
  --hsk5-bg: #ffe4e6;
  --hsk6-color: #be123c;
  --hsk6-bg: #fecdd3;
  --hsk79-color: #854d0e;
  --hsk79-bg: #fef9c3;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ==========================================================================
   APP HEADER (TOP BAR)
   ========================================================================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-pink-subtle);
  box-shadow: 0 4px 20px rgba(255, 105, 180, 0.06);
}

.header-container {
  max-width: 1560px;
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
  user-select: none;
}

.brand-badge-icon {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(135deg, #ff6b8b, #0ea5e9);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-calligraphy);
  font-size: 26px;
  box-shadow: 0 4px 14px rgba(255, 107, 139, 0.35);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.brand-section:hover .brand-badge-icon {
  transform: rotate(-6deg) scale(1.08);
}

.brand-text h1 {
  font-size: 19px;
  font-weight: 800;
  background: linear-gradient(90deg, #ff4071 0%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-tag {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 20px;
  background: var(--pink-soft);
  color: var(--pink-primary);
  border: 1px solid var(--pink-border);
  letter-spacing: 0.4px;
}

.brand-text p {
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 500;
}

/* Global Search Bar */
.search-wrapper {
  flex: 1;
  max-width: 460px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 42px 10px 40px;
  border-radius: 999px;
  border: 1.5px solid rgba(255, 182, 193, 0.5);
  background: #ffffff;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--text-main);
  outline: none;
  transition: all 0.25s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.search-input:focus {
  border-color: var(--pink-primary);
  box-shadow: 0 0 0 4px rgba(255, 82, 123, 0.12), 0 4px 14px rgba(255, 82, 123, 0.08);
}

.search-icon-left {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--pink-primary);
  font-size: 15px;
  pointer-events: none;
}

.search-shortcut-badge {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--cyan-light);
  color: var(--cyan-primary);
  font-size: 10px;
  font-weight: 700;
  padding: 3px 6px;
  border-radius: 6px;
}

/* Header Action Buttons */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: var(--shadow-xs);
}

.action-btn:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
  transform: translateY(-1px);
}

.action-btn.btn-primary {
  background: linear-gradient(135deg, #ff527b, #ff758c);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 12px rgba(255, 82, 123, 0.25);
}

.action-btn.btn-primary:hover {
  background: linear-gradient(135deg, #e03a63, #ff637b);
  transform: translateY(-1.5px);
  box-shadow: 0 6px 16px rgba(255, 82, 123, 0.35);
}

.action-btn.btn-cyan {
  background: linear-gradient(135deg, #0284c7, #06b6d4);
  color: #ffffff;
  border: none;
  box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}

.action-btn.btn-cyan:hover {
  background: linear-gradient(135deg, #0369a1, #0891b2);
  transform: translateY(-1.5px);
}

.action-btn.btn-game-highlight {
  background: linear-gradient(135deg, #f43f5e, #fb7185);
  color: #ffffff;
  border: none;
  font-weight: 800;
  box-shadow: 0 4px 14px rgba(244, 63, 94, 0.35);
  animation: pulseGlow 1.8s infinite alternate;
}

.action-btn.btn-game-highlight:hover {
  background: linear-gradient(135deg, #e11d48, #f43f5e);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 6px 18px rgba(244, 63, 94, 0.45);
}

.game-btn-badge {
  background: #ffffff;
  color: #f43f5e;
  font-size: 10px;
  font-weight: 900;
  padding: 2px 7px;
  border-radius: 20px;
  margin-left: 4px;
}

/* Callout Banner for Game Arena */
.game-quick-banner {
  background: linear-gradient(135deg, #fff5f8 0%, #ffffff 40%, #f0fdfa 100%);
  border: 1.5px solid var(--border-pink-subtle);
  border-radius: 18px;
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 22px;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-sm);
}

.game-quick-banner:hover {
  border-color: var(--pink-primary);
  box-shadow: 0 10px 28px rgba(255, 82, 123, 0.2);
  transform: translateY(-2px);
}

.game-banner-avatar {
  font-size: 38px;
  line-height: 1;
  animation: floatBubble 2.5s infinite alternate;
}

/* ==========================================================================
   NAVIGATION BAR (PILL TABS)
   ========================================================================== */
.navigation-bar {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  padding: 6px 16px;
  position: sticky;
  top: 69px;
  z-index: 90;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.nav-tabs-wrapper {
  max-width: 1560px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 82, 123, 0.35) transparent;
  padding: 6px 2px;
}

.nav-tabs-wrapper::-webkit-scrollbar {
  height: 4px;
}

.nav-tabs-wrapper::-webkit-scrollbar-thumb {
  background: rgba(255, 82, 123, 0.35);
  border-radius: 4px;
}

.nav-tab-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-tab-pill:hover {
  background: rgba(255, 240, 245, 0.8);
  color: var(--pink-primary);
}

.nav-tab-pill.active {
  background: linear-gradient(135deg, #ff527b, #ff758c);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(255, 82, 123, 0.28);
}

.nav-tab-pill.active .nav-icon {
  transform: scale(1.15);
}

.nav-pill-badge {
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.35);
  font-weight: 700;
}

.nav-tab-pill:not(.active) .nav-pill-badge {
  background: var(--cyan-light);
  color: var(--cyan-primary);
}

/* ==========================================================================
   MAIN CONTENT AREA
   ========================================================================== */
.main-viewport {
  flex: 1;
  max-width: 1560px;
  width: 100%;
  margin: 0 auto;
  padding: 24px;
}

.tab-pane {
  display: none;
  animation: fadeIn 0.3s ease;
}

.tab-pane.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* SECTION TITLES & HEADINGS */
.section-header-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.section-title-group h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.section-title-group p {
  font-size: 13.5px;
  color: var(--text-muted);
  margin-top: 4px;
}

.controls-filter-group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* Level filter buttons */
.filter-btn-pill {
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
}

.filter-btn-pill:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

.filter-btn-pill.active {
  background: var(--pink-primary);
  color: #ffffff;
  border-color: var(--pink-primary);
  box-shadow: 0 2px 8px rgba(255, 82, 123, 0.3);
}

/* ==========================================================================
   MODULE 1: LƯỚI CHỮ HÁN GOHANZI (HANZI GRID 10x10)
   ========================================================================== */
.hanzi-dashboard-hero {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 240, 245, 0.85) 50%, rgba(240, 249, 255, 0.9) 100%);
  border: 1px solid var(--pink-border);
  border-radius: 20px;
  padding: 22px 28px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.hanzi-stat-box {
  display: flex;
  align-items: center;
  gap: 16px;
}

.hanzi-stat-icon {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: var(--pink-soft);
  color: var(--pink-primary);
  font-size: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--pink-border);
}

.hanzi-stat-info b {
  font-size: 24px;
  font-weight: 800;
  color: var(--pink-primary);
}

.hanzi-stat-info span {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

/* Hanzi 10x10 Grid */
.hanzi-matrix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(78px, 1fr));
  gap: 10px;
  margin-bottom: 24px;
}

.hanzi-card-cell {
  background: #ffffff;
  border: 1.5px solid rgba(226, 232, 240, 0.9);
  border-radius: 14px;
  padding: 10px 4px 8px;
  text-align: center;
  cursor: pointer;
  transition: all 0.22s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  user-select: none;
}

.hanzi-card-cell:hover {
  transform: translateY(-4px) scale(1.04);
  border-color: var(--pink-primary);
  box-shadow: 0 10px 22px rgba(255, 82, 123, 0.16);
  z-index: 5;
}

.hanzi-card-cell .hanzi-glyph {
  font-family: var(--font-hanzi);
  font-size: 32px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.15;
}

.hanzi-card-cell .hanzi-pinyin {
  font-size: 11px;
  font-weight: 700;
  color: var(--cyan-primary);
  margin-top: 3px;
}

.hanzi-card-cell .hanzi-hanviet {
  font-size: 10px;
  color: var(--text-muted);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 4px;
}

.hanzi-level-tag {
  position: absolute;
  top: 4px;
  right: 4px;
  font-size: 8.5px;
  font-weight: 800;
  padding: 1px 4px;
  border-radius: 4px;
  background: var(--pink-soft);
  color: var(--pink-primary);
}

/* Pagination bar */
.pagination-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 20px 0 30px;
}

.page-btn {
  padding: 8px 18px;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.page-btn:hover:not(:disabled) {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

.page-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.page-info-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

/* ==========================================================================
   MODULE 2: TẬP VIẾT BÚT THUẬN Ô MỄ TỰ (HANZI WRITER & PRACTICE)
   ========================================================================== */
.writer-studio-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
  align-items: start;
}

.writer-canvas-panel {
  background: #ffffff;
  border: 1.5px solid var(--border-pink-subtle);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  position: sticky;
  top: 135px;
}

.mizige-box-wrapper {
  position: relative;
  width: 250px;
  height: 250px;
  background: #fffdfd;
  border: 2px solid #ffccd8;
  border-radius: 18px;
  box-shadow: inset 0 0 16px rgba(255, 94, 134, 0.08);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

/* Ô Mễ Tự Cách (米字格) Lines */
.mizige-grid-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.mizige-line {
  position: absolute;
  border-color: #ffdce5;
}

.mizige-line.horizontal {
  top: 50%;
  left: 0;
  width: 100%;
  border-top: 1px dashed #ffb6c7;
}

.mizige-line.vertical {
  left: 50%;
  top: 0;
  height: 100%;
  border-left: 1px dashed #ffb6c7;
}

.mizige-line.diagonal-1 {
  width: 141.4%;
  top: 0;
  left: 0;
  transform-origin: 0 0;
  transform: rotate(45deg);
  border-top: 1px dotted #ffd4de;
}

.mizige-line.diagonal-2 {
  width: 141.4%;
  bottom: 0;
  left: 0;
  transform-origin: 0 100%;
  transform: rotate(-45deg);
  border-top: 1px dotted #ffd4de;
}

#hanziWriterTarget {
  width: 220px;
  height: 220px;
  position: relative;
  z-index: 2;
}

.writer-controls-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  width: 100%;
}

.writer-ctrl-btn {
  padding: 8px 14px;
  border-radius: 10px;
  font-size: 12.5px;
  font-weight: 700;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.writer-ctrl-btn:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

.writer-ctrl-btn.active {
  background: var(--pink-primary);
  color: #ffffff;
  border-color: var(--pink-primary);
}

.practice-status-banner {
  margin-top: 14px;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 8px;
  text-align: center;
  width: 100%;
  display: none;
}

.practice-status-banner.show {
  display: block;
}

.practice-status-banner.correct {
  background: #e6f9f0;
  color: #047857;
  border: 1px solid #a7f3d0;
}

.practice-status-banner.error {
  background: #fff1f2;
  color: #be123c;
  border: 1px solid #fecdd3;
}

/* Hanzi Analysis Detail Panel */
.writer-analysis-panel {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.analysis-header-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-bottom: 20px;
  border-bottom: 1.5px solid var(--pink-soft);
  margin-bottom: 24px;
}

.analysis-big-char {
  font-family: var(--font-hanzi);
  font-size: 58px;
  font-weight: 800;
  color: var(--pink-primary);
  line-height: 1;
}

.analysis-meta h3 {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.analysis-tags {
  display: flex;
  gap: 8px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.meta-pill {
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 8px;
}

.meta-pill.pinyin-pill {
  background: var(--cyan-light);
  color: var(--cyan-primary);
}

.meta-pill.hanviet-pill {
  background: var(--pink-soft);
  color: var(--pink-primary);
}

.meta-pill.radical-pill {
  background: var(--teal-light);
  color: var(--teal-primary);
}

.meta-pill.strokes-pill {
  background: #f1f5f9;
  color: var(--text-secondary);
}

.analysis-section-block {
  margin-bottom: 22px;
}

.analysis-section-block h4 {
  font-size: 15px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.meaning-box-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
}

/* Compounds chips */
.compounds-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.compound-chip {
  padding: 7px 12px;
  border-radius: 10px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.compound-chip:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xs);
}

.compound-chip .comp-zh {
  font-family: var(--font-hanzi);
  font-weight: 700;
  font-size: 15px;
  color: var(--text-main);
}

.compound-chip .comp-py {
  font-size: 11px;
  color: var(--cyan-primary);
  font-weight: 600;
}

/* ==========================================================================
   MODULE 3: BẢN ĐỒ HÁN TỰ (HANZI MINDMAP)
   ========================================================================== */
.mindmap-container-box {
  background: #ffffff;
  border: 1.5px solid var(--border-cyan-subtle);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow-sm);
  min-height: 520px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.mindmap-header-search {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.mindmap-center-core {
  align-self: center;
  margin: 20px auto 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.core-char-circle {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: linear-gradient(135deg, #ff527b, #ff758c);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-hanzi);
  font-size: 54px;
  font-weight: 800;
  box-shadow: 0 10px 28px rgba(255, 82, 123, 0.35);
  animation: pulseCore 3s infinite alternate;
}

@keyframes pulseCore {
  from { transform: scale(1); }
  to { transform: scale(1.05); box-shadow: 0 14px 36px rgba(255, 82, 123, 0.45); }
}

.core-char-meta {
  margin-top: 12px;
  text-align: center;
}

.core-char-meta b {
  font-size: 18px;
  color: var(--cyan-primary);
}

.core-char-meta p {
  font-size: 13px;
  color: var(--text-muted);
}

/* Branches nodes grid */
.mindmap-branches-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
  width: 100%;
}

.mindmap-node-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 16px;
  padding: 14px 16px;
  cursor: pointer;
  transition: all 0.22s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-xs);
}

.mindmap-node-card:hover {
  border-color: var(--cyan-primary);
  background: var(--cyan-soft);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(2, 132, 199, 0.12);
}

.node-zh-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.node-zh-badge {
  font-family: var(--font-hanzi);
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
}

.node-info b {
  display: block;
  font-size: 12px;
  color: var(--cyan-primary);
}

.node-info span {
  font-size: 12px;
  color: var(--text-secondary);
}

.node-action-icon {
  color: var(--pink-primary);
  font-size: 18px;
}

/* ==========================================================================
   MODULE 4: KHO 11.000 TỪ VỰNG HSK 1-9
   ========================================================================== */
.vocab-search-filter-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 20px;
  padding: 18px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-xs);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.vocab-grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 14px;
}

.vocab-item-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 18px;
  padding: 16px 18px;
  transition: all 0.22s ease;
  box-shadow: var(--shadow-xs);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.vocab-item-card:hover {
  transform: translateY(-3px);
  border-color: var(--pink-primary);
  box-shadow: 0 8px 22px rgba(255, 82, 123, 0.10);
}

.vocab-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.vocab-hanzi-text {
  font-family: var(--font-hanzi);
  font-size: 26px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: 0.5px;
}

.vocab-pinyin-text {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cyan-primary);
}

.vocab-hanviet-text {
  font-size: 12px;
  color: var(--pink-primary);
  font-weight: 600;
}

.vocab-meaning-text {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.vocab-example-box {
  background: var(--bg-subtle);
  border-left: 3px solid var(--cyan-primary);
  border-radius: 0 10px 10px 0;
  padding: 8px 10px;
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.vocab-example-zh {
  font-family: var(--font-hanzi);
  font-weight: 600;
  color: var(--text-main);
}

.vocab-example-vi {
  color: var(--text-muted);
  margin-top: 2px;
}

.card-actions-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 6px;
}

.mini-icon-btn {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mini-icon-btn:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

.mini-icon-btn.active-fav {
  color: #eab308;
  background: #fefce8;
  border-color: #fef08a;
}

/* ==========================================================================
   MODULE 5: THẺ NHỚ FLASHCARD 3D (FSRS STUDY SUITE)
   ========================================================================== */
.flashcard-stage-wrapper {
  max-width: 640px;
  margin: 20px auto 40px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.flashcard-scene {
  width: 100%;
  height: 380px;
  perspective: 1000px;
  cursor: pointer;
}

.flashcard-3d-box {
  width: 100%;
  height: 100%;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 28px;
  box-shadow: var(--shadow-md);
}

.flashcard-3d-box.flipped {
  transform: rotateY(180deg);
}

.card-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: 28px;
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 2px solid var(--pink-border);
}

.card-face.front {
  background: linear-gradient(145deg, #ffffff, #fff7fa);
}

.card-face.back {
  background: linear-gradient(145deg, #ffffff, #f0fdfa);
  transform: rotateY(180deg);
  border-color: var(--teal-border);
}

.fc-hanzi-huge {
  font-family: var(--font-hanzi);
  font-size: 72px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 12px;
}

.fc-hint-tag {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--pink-soft);
  color: var(--pink-primary);
  padding: 4px 12px;
  border-radius: 999px;
  font-weight: 600;
}

.fc-pinyin-huge {
  font-size: 26px;
  font-weight: 800;
  color: var(--cyan-primary);
  margin-bottom: 6px;
}

.fc-hanviet-badge {
  font-size: 15px;
  font-weight: 700;
  color: var(--pink-primary);
  margin-bottom: 12px;
}

.fc-meaning-text {
  font-size: 18px;
  color: var(--text-main);
  font-weight: 600;
  margin-bottom: 16px;
  max-width: 85%;
}

.fc-example-quote {
  font-size: 13px;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.8);
  padding: 10px 16px;
  border-radius: 12px;
  border: 1px dashed var(--teal-border);
}

/* FSRS Rating Buttons */
.fsrs-button-deck {
  display: flex;
  gap: 12px;
  margin-top: 24px;
  width: 100%;
  justify-content: center;
}

.fsrs-btn {
  flex: 1;
  max-width: 120px;
  padding: 12px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.fsrs-btn.btn-again { background: #fee2e2; color: #b91c1c; }
.fsrs-btn.btn-hard { background: #fef3c7; color: #b45309; }
.fsrs-btn.btn-good { background: #e0f2fe; color: #0369a1; }
.fsrs-btn.btn-easy { background: #dcfce7; color: #15803d; }

.fsrs-btn:hover {
  transform: translateY(-2px);
  filter: brightness(0.96);
}

/* ==========================================================================
   MODULE 6: THÀNH CÔNG CHI LỘ (ROAD TO SUCCESS - BLCU)
   ========================================================================== */
.curriculum-layout-grid {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}

.lesson-sidebar-tree {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  padding: 18px;
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}

.curriculum-tier-title {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--pink-primary);
  margin: 12px 6px 8px;
}

.lesson-tree-item {
  padding: 12px 14px;
  border-radius: 12px;
  margin-bottom: 6px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.lesson-tree-item:hover {
  background: var(--pink-soft);
  border-color: var(--pink-border);
}

.lesson-tree-item.active {
  background: linear-gradient(135deg, rgba(255, 82, 123, 0.12), rgba(2, 132, 199, 0.08));
  border-color: var(--pink-primary);
}

.lesson-tree-item b {
  display: block;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
}

.lesson-tree-item span {
  font-size: 11.5px;
  color: var(--text-muted);
}

/* Lesson Content Reader */
.lesson-article-viewer {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.lesson-banner-header {
  border-bottom: 1.5px solid var(--border-light);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.lesson-banner-header .unit-badge {
  display: inline-block;
  background: var(--cyan-light);
  color: var(--cyan-primary);
  font-size: 11px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}

.lesson-banner-header h3 {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-main);
  font-family: var(--font-hanzi);
}

.lesson-banner-header .pinyin-sub {
  font-size: 14px;
  color: var(--cyan-primary);
  font-weight: 600;
  margin-top: 4px;
}

.lesson-banner-header .vi-sub {
  font-size: 14.5px;
  color: var(--text-secondary);
  font-weight: 500;
  margin-top: 4px;
}

.article-paragraph-box {
  margin-bottom: 24px;
  background: var(--bg-subtle);
  border-radius: 16px;
  padding: 20px;
  border: 1px solid var(--border-light);
}

.paragraph-zh {
  font-family: var(--font-hanzi);
  font-size: 19px;
  line-height: 2.1;
  color: var(--text-main);
  letter-spacing: 0.5px;
}

.paragraph-zh span.word-highlight {
  background: #fef08a;
  color: #854d0e;
  padding: 2px 4px;
  border-radius: 4px;
  cursor: pointer;
}

.paragraph-py {
  font-size: 13.5px;
  color: var(--cyan-primary);
  line-height: 1.8;
  margin-top: 10px;
  font-weight: 500;
  display: none;
}

.paragraph-py.show {
  display: block;
}

.paragraph-vi {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-light);
  display: none;
}

.paragraph-vi.show {
  display: block;
}

.paragraph-audio-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}

/* ==========================================================================
   MODULE 7: ĐẠI ĐIỂN NGỮ PHÁP HSK 3.0 (577 ĐIỂM & 10 CHƯƠNG)
   ========================================================================== */
.grammar-suite-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 24px;
  align-items: start;
}

.grammar-index-panel {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  padding: 18px;
  box-shadow: var(--shadow-sm);
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}

.grammar-item-row {
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  margin-bottom: 6px;
  transition: all 0.2s ease;
}

.grammar-item-row:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-border);
}

.grammar-item-row.active {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.1), rgba(255, 82, 123, 0.08));
  border-color: var(--cyan-primary);
}

.grammar-item-row b {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.35;
}

.grammar-item-row span {
  font-size: 11.5px;
  color: var(--text-muted);
}

.grammar-detail-panel {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 24px;
  padding: 30px;
  box-shadow: var(--shadow-sm);
}

.grammar-formula-card {
  background: linear-gradient(135deg, #f0f9ff, #f8fafc);
  border: 1.5px solid var(--cyan-border);
  border-radius: 16px;
  padding: 18px 22px;
  margin: 18px 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan-primary);
  line-height: 1.6;
}

.grammar-notes-box {
  background: #fff7ed;
  border-left: 4px solid #f97316;
  border-radius: 0 14px 14px 0;
  padding: 16px;
  font-size: 13.5px;
  color: #9a3412;
  line-height: 1.65;
  margin: 18px 0;
  white-space: pre-wrap;
}

.grammar-examples-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 14px;
}

.grammar-example-item {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 14px 16px;
}

.ex-zh {
  font-family: var(--font-hanzi);
  font-size: 16.5px;
  font-weight: 700;
  color: var(--text-main);
}

.ex-py {
  font-size: 12.5px;
  color: var(--cyan-primary);
  font-weight: 600;
  margin: 3px 0;
}

.ex-vi {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ==========================================================================
   MODULE 8: TRẮC NGHIỆM & BÀI TẬP (OPENQUIZ ENGINE)
   ========================================================================== */
.quiz-arena-wrapper {
  max-width: 760px;
  margin: 20px auto 40px;
}

.quiz-card-box {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 24px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.quiz-progress-bar {
  width: 100%;
  height: 8px;
  background: #f1f5f9;
  border-radius: 999px;
  margin-bottom: 24px;
  overflow: hidden;
}

.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #ff527b, #0284c7);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.quiz-question-title {
  font-size: 20px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 22px;
}

.quiz-options-list {
  display: grid;
  gap: 12px;
}

.quiz-opt-btn {
  padding: 14px 18px;
  border-radius: 14px;
  border: 1.5px solid var(--border-light);
  background: #ffffff;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--text-main);
  text-align: left;
  cursor: pointer;
  transition: all 0.2s ease;
}

.quiz-opt-btn:hover:not(.disabled) {
  border-color: var(--pink-primary);
  background: var(--pink-soft);
  transform: translateX(4px);
}

.quiz-opt-btn.correct {
  background: #e6f9f0;
  border-color: #34d399;
  color: #047857;
}

.quiz-opt-btn.wrong {
  background: #fff1f2;
  border-color: #f87171;
  color: #b91c1c;
}

/* ==========================================================================
   MODAL DETAIL SHEET / DRAWER
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.show {
  display: flex;
}

.modal-card {
  background: #ffffff;
  border-radius: 24px;
  max-width: 600px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  padding: 28px;
  position: relative;
  border: 1.5px solid var(--pink-border);
  animation: modalPop 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes modalPop {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

.modal-close-btn {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-muted);
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.modal-close-btn:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

/* ==========================================================================
   RESPONSIVE DESIGN (MOBILE & TABLET)
   ========================================================================== */
@media (max-width: 1080px) {
  .writer-studio-layout,
  .curriculum-layout-grid,
  .grammar-suite-layout {
    grid-template-columns: 1fr;
  }

  .writer-canvas-panel {
    position: static;
  }

  .lesson-sidebar-tree,
  .grammar-index-panel {
    max-height: 300px;
  }
}

@media (max-width: 680px) {
  .header-container {
    padding: 10px 14px;
  }
  
  .brand-text p,
  .search-shortcut-badge {
    display: none;
  }
  
  .main-viewport {
    padding: 14px;
  }

  .hanzi-matrix-grid {
    grid-template-columns: repeat(auto-fill, minmax(64px, 1fr));
    gap: 6px;
  }

  .hanzi-card-cell .hanzi-glyph {
    font-size: 26px;
  }

  .mizige-box-wrapper {
    width: 200px;
    height: 200px;
  }

  #hanziWriterTarget {
    width: 180px;
    height: 180px;
  }
}

/* ==========================================================================
   TRUYỆN CHÊM AI (SANDWICH STORIES ENHANCEMENTS)
   ========================================================================== */
.chem-paragraph {
  font-size: 17px;
  line-height: 2.2;
  color: #1e293b;
  margin-bottom: 18px;
  text-align: justify;
}

.chem-badge {
  display: inline-flex;
  align-items: baseline;
  background: linear-gradient(135deg, #fff0f5, #fce7f3);
  border: 1.5px solid #fbcfe8;
  border-radius: 8px;
  padding: 1px 7px;
  margin: 0 3px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 1px 3px rgba(255, 82, 123, 0.1);
  vertical-align: middle;
}

.chem-badge:hover {
  background: #ff527b;
  border-color: #ff527b;
  color: #ffffff !important;
  transform: translateY(-2px) scale(1.04);
  box-shadow: 0 4px 12px rgba(255, 82, 123, 0.3);
}

.chem-badge:hover .chem-word,
.chem-badge:hover .chem-py,
.chem-badge:hover .chem-hv,
.chem-badge:hover .chem-vi {
  color: #ffffff !important;
}

.chem-word {
  font-family: var(--font-hanzi);
  font-size: 19px;
  font-weight: 800;
  color: #be185d;
  letter-spacing: 0.5px;
}

.chem-meta {
  font-size: 11.5px;
  margin-left: 5px;
  display: inline-flex;
  gap: 4px;
}

.chem-py {
  font-weight: 700;
  color: #0284c7;
}

.chem-hv {
  color: #64748b;
  font-weight: 600;
}

.chem-vi {
  color: #334155;
  font-weight: 500;
}

/* Sandwich Display Modes */
.chem-mode-hanzi-only .chem-meta {
  display: none !important;
}

.chem-mode-hanzi-pinyin .chem-hv,
.chem-mode-hanzi-pinyin .chem-vi {
  display: none !important;
}

/* Target Vocab Table in Stories */
.story-vocab-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 14px;
  background: #ffffff;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-light);
}

.story-vocab-table th {
  background: var(--pink-soft);
  color: var(--pink-primary);
  font-size: 12.5px;
  font-weight: 800;
  padding: 10px 14px;
  text-align: left;
}

.story-vocab-table td {
  padding: 10px 14px;
  border-top: 1px solid var(--border-light);
  font-size: 13px;
  color: var(--text-secondary);
}

.story-vocab-table tr:hover {
  background: #fdf2f8;
}

/* ==========================================================================
   NOTEBOOK & EXCEL/PDF EXPORT STYLES
   ========================================================================== */
.notebook-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  padding: 16px 22px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-xs);
  flex-wrap: wrap;
}

.notebook-stats-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 24px;
}

.notebook-stat-card {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 18px;
  padding: 18px 20px;
  box-shadow: var(--shadow-xs);
  display: flex;
  align-items: center;
  gap: 14px;
}

.notebook-stat-icon {
  width: 46px;
  height: 46px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.notebook-stat-icon.pink { background: var(--pink-soft); color: var(--pink-primary); }
.notebook-stat-icon.cyan { background: var(--cyan-light); color: var(--cyan-primary); }
.notebook-stat-icon.teal { background: var(--teal-light); color: var(--teal-primary); }

.notebook-stat-info b {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
}

.notebook-stat-info span {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

/* Notebook Table View */
.notebook-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: #ffffff;
  border-radius: 18px;
  overflow: hidden;
  border: 1.5px solid var(--border-light);
  box-shadow: var(--shadow-xs);
}

.notebook-table th {
  background: #f8fafc;
  color: var(--text-secondary);
  font-size: 12.5px;
  font-weight: 800;
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1.5px solid var(--border-light);
}

.notebook-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.7);
  font-size: 13.5px;
  vertical-align: middle;
}

.notebook-table tr:hover td {
  background: #fff0f5;
}

/* Tô màu chữ Hán nổi bật sắc nét trong Sổ tay */
.notebook-hanzi-colored {
  font-family: var(--font-hanzi);
  font-size: 24px;
  font-weight: 900;
  background: linear-gradient(135deg, #ff2a6d 0%, #ff527b 45%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.2s ease;
}

.notebook-hanzi-colored:hover {
  transform: scale(1.08);
  filter: brightness(1.15) drop-shadow(0 2px 8px rgba(255, 42, 109, 0.25));
}

.mini-icon-btn-inline {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  padding: 0;
  flex-shrink: 0;
}

.mini-icon-btn-inline:hover {
  background: var(--cyan-soft);
  border-color: var(--cyan-border);
  transform: translateY(-1px);
}

.btn-del-subtle {
  color: var(--text-muted);
  opacity: 0.6;
}

.btn-del-subtle:hover {
  background: #fff1f2;
  border-color: #fca5a5;
  color: #e11d48;
  opacity: 1;
}

/* Ô Viết Chữ (米字格) Trực Tiếp Trong Bảng Sổ Tay */
.table-mizige-strip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 5px 10px;
  border-radius: 14px;
  background: #ffffff;
  border: 1.5px solid var(--pink-border);
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
}

.table-mizige-strip:hover {
  background: var(--pink-soft);
  border-color: var(--pink-primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(255, 82, 123, 0.22);
}

.table-mizige-box {
  width: 42px;
  height: 42px;
  position: relative;
  background: #ffffff;
  border: 1.5px solid #ff9ebb;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(255, 82, 123, 0.1);
}

.table-mizige-box::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  border-top: 1px dashed #ffb6c7;
  pointer-events: none;
}

.table-mizige-box::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  height: 100%;
  border-left: 1px dashed #ffb6c7;
  pointer-events: none;
}

.table-mizige-diag {
  position: absolute;
  width: 141.4%;
  height: 0;
  border-top: 1px dotted #ffd4de;
  pointer-events: none;
}

.table-mizige-diag.d1 {
  top: 0;
  left: 0;
  transform-origin: 0 0;
  transform: rotate(45deg);
}

.table-mizige-diag.d2 {
  bottom: 0;
  left: 0;
  transform-origin: 0 100%;
  transform: rotate(-45deg);
}

.table-mizige-char-watermark {
  position: relative;
  z-index: 2;
  font-family: var(--font-hanzi);
  font-size: 24px;
  font-weight: 700;
  color: #ff527b;
  opacity: 0.35;
  user-select: none;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.table-mizige-strip:hover .table-mizige-char-watermark {
  opacity: 0.85;
  transform: scale(1.08);
}

.table-mizige-write-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--pink-primary);
  background: var(--pink-soft);
  border: 1px solid var(--pink-border);
  padding: 4px 8px;
  border-radius: 8px;
  margin-left: 2px;
  transition: all 0.2s ease;
}

.table-mizige-strip:hover .table-mizige-write-btn {
  background: var(--pink-primary);
  color: #ffffff;
  border-color: var(--pink-primary);
}

/* ==========================================================================
   GAME ARENA (BAOLINGO GAMIFIED LEARNING SYSTEM - 11,000 VOCABULARY POOL)
   ========================================================================== */

.game-header-hero {
  background: linear-gradient(135deg, #fff5f8 0%, #ffffff 40%, #f0fdfa 100%);
  border: 1px solid var(--border-pink-subtle);
  border-radius: 20px;
  padding: 24px 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
}

.game-hero-content {
  flex: 1;
  min-width: 280px;
}

.game-hero-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  color: var(--pink-primary);
  background: var(--pink-soft);
  border: 1px solid var(--pink-border);
  border-radius: 20px;
  padding: 4px 12px;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

.game-hero-content h2 {
  font-size: 24px;
  font-weight: 900;
  color: var(--text-main);
  margin-bottom: 6px;
}

.game-hero-content p {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.5;
  max-width: 680px;
}

.game-stats-pillbox {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.game-stat-item {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  box-shadow: var(--shadow-xs);
}

.game-stat-item .stat-icon {
  font-size: 22px;
}

.game-stat-item .stat-val {
  font-size: 18px;
  font-weight: 900;
  color: var(--text-main);
  line-height: 1.1;
}

.game-stat-item .stat-lbl {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}

.game-sfx-toggle {
  background: var(--cyan-soft);
  color: var(--cyan-primary);
  border: 1.5px solid var(--cyan-border);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.2s;
}

.game-sfx-toggle:hover {
  background: var(--cyan-light);
  transform: translateY(-2px);
}

/* Control Panel */
.game-control-panel {
  background: #ffffff;
  border-radius: 20px;
  padding: 22px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.game-type-selector {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-bottom: 20px;
}

.game-type-card {
  background: #ffffff;
  border: 2px solid var(--border-light);
  border-radius: 16px;
  padding: 18px;
  text-align: left;
  cursor: pointer;
  transition: all 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.game-type-card:hover {
  border-color: var(--pink-primary);
  box-shadow: 0 8px 24px var(--pink-shadow);
  transform: translateY(-3px);
}

.game-type-card.active {
  border-color: var(--pink-primary);
  background: linear-gradient(135deg, #fff5f8 0%, #ffffff 100%);
  box-shadow: 0 8px 24px var(--pink-shadow);
}

.game-card-icon {
  font-size: 32px;
  margin-bottom: 2px;
}

.game-card-title {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
}

.game-card-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

.game-filter-bar {
  display: flex;
  align-items: flex-end;
  gap: 16px;
  flex-wrap: wrap;
  padding-top: 18px;
  border-top: 1px solid var(--border-light);
}

.game-filter-group {
  flex: 1;
  min-width: 210px;
}

.game-filter-group label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  display: block;
  margin-bottom: 6px;
}

.game-select {
  width: 100%;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1.5px solid var(--border-light);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-main);
  background: #ffffff;
  cursor: pointer;
  outline: none;
  transition: border-color 0.2s;
}

.game-select:focus {
  border-color: var(--pink-primary);
  box-shadow: 0 0 0 3px rgba(255, 82, 123, 0.15);
}

/* Arena Viewport */
.game-arena-container {
  background: #ffffff;
  border-radius: 24px;
  padding: 24px;
  border: 1.5px solid var(--border-pink-subtle);
  box-shadow: var(--shadow-md);
  margin-bottom: 30px;
}

.game-hud-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding-bottom: 20px;
  border-bottom: 1.5px solid var(--border-light);
  flex-wrap: wrap;
}

.game-hud-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 900;
  color: var(--pink-primary);
  background: var(--pink-soft);
  padding: 8px 18px;
  border-radius: 30px;
  border: 1px solid var(--pink-border);
}

.game-target-box {
  text-align: center;
  padding: 10px 28px;
  background: linear-gradient(135deg, #fff0f5 0%, #f0fdfa 100%);
  border-radius: 18px;
  border: 1.5px solid var(--pink-border);
  position: relative;
  min-width: 240px;
}

.game-target-sub {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.game-target-main {
  font-size: 32px;
  font-weight: 900;
  color: var(--text-main);
  font-family: 'Noto Sans SC', sans-serif;
  margin: 2px 0;
}

.game-target-audio-btn {
  position: absolute;
  right: -14px;
  top: 50%;
  transform: translateY(-50%);
  background: #ffffff;
  border: 2px solid var(--pink-primary);
  color: var(--pink-primary);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.game-target-audio-btn:hover {
  transform: translateY(-50%) scale(1.1);
  background: var(--pink-soft);
}

.game-hud-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.game-hud-score-box {
  text-align: right;
}

.game-hud-score-val {
  font-size: 24px;
  font-weight: 900;
  color: var(--teal-primary);
  line-height: 1;
}

.game-hud-score-lbl {
  font-size: 10px;
  font-weight: 800;
  color: var(--text-muted);
}

.game-hud-combo-badge {
  background: linear-gradient(135deg, #f43f5e, #fb7185);
  color: #ffffff;
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 900;
  font-size: 13.5px;
  box-shadow: 0 4px 14px rgba(244, 63, 94, 0.35);
  animation: pulseGlow 1.2s infinite alternate;
}

.game-quit-btn {
  background: transparent;
  border: 1px solid var(--border-light);
  border-radius: 10px;
  padding: 8px 14px;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 700;
  transition: all 0.2s;
}

.game-quit-btn:hover {
  background: #fee2e2;
  color: #dc2626;
  border-color: #fca5a5;
}

/* 1. Mode Bubble Shooter */
.bubble-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 22px;
  min-height: 360px;
  padding: 30px 10px;
}

.bubble-ball {
  width: 145px;
  height: 145px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  cursor: pointer;
  position: relative;
  user-select: none;
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, #ffe4ec 45%, #ffb6c1 100%);
  box-shadow: 0 12px 28px rgba(255, 94, 134, 0.28), inset -6px -6px 14px rgba(255, 255, 255, 0.85), inset 6px 6px 14px rgba(255, 82, 123, 0.25);
  animation: floatBubble 3s ease-in-out infinite alternate;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s;
  padding: 10px;
}

.bubble-ball:nth-child(2) {
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, #e0f2fe 45%, #7dd3fc 100%);
  box-shadow: 0 12px 28px rgba(2, 132, 199, 0.28), inset -6px -6px 14px rgba(255, 255, 255, 0.85), inset 6px 6px 14px rgba(2, 132, 199, 0.25);
  animation-duration: 3.4s;
  animation-delay: -0.8s;
}

.bubble-ball:nth-child(3) {
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, #ccfbf1 45%, #5eead4 100%);
  box-shadow: 0 12px 28px rgba(13, 148, 136, 0.28), inset -6px -6px 14px rgba(255, 255, 255, 0.85), inset 6px 6px 14px rgba(13, 148, 136, 0.25);
  animation-duration: 3.8s;
  animation-delay: -1.5s;
}

.bubble-ball:nth-child(4) {
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, #fef3c7 45%, #fcd34d 100%);
  box-shadow: 0 12px 28px rgba(245, 158, 11, 0.28), inset -6px -6px 14px rgba(255, 255, 255, 0.85), inset 6px 6px 14px rgba(245, 158, 11, 0.25);
  animation-duration: 3.2s;
  animation-delay: -0.4s;
}

.bubble-ball:nth-child(5) {
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, #f3e8ff 45%, #d8b4fe 100%);
  box-shadow: 0 12px 28px rgba(168, 85, 247, 0.28), inset -6px -6px 14px rgba(255, 255, 255, 0.85), inset 6px 6px 14px rgba(168, 85, 247, 0.25);
  animation-duration: 3.6s;
  animation-delay: -1.2s;
}

.bubble-ball:nth-child(6) {
  background: radial-gradient(circle at 35% 35%, #ffffff 0%, #ffe4e6 45%, #fda4af 100%);
  box-shadow: 0 12px 28px rgba(244, 63, 94, 0.28), inset -6px -6px 14px rgba(255, 255, 255, 0.85), inset 6px 6px 14px rgba(244, 63, 94, 0.25);
  animation-duration: 3.5s;
  animation-delay: -0.6s;
}

.bubble-ball:hover {
  transform: scale(1.1);
  box-shadow: 0 18px 36px rgba(255, 94, 134, 0.38);
}

.bubble-hz {
  font-size: 30px;
  font-weight: 900;
  color: var(--text-main);
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.1;
}

.bubble-sub {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 4px;
}

.bubble-shortcut {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 11px;
  font-weight: 800;
  color: rgba(15, 23, 42, 0.45);
}

.bubble-pop-burst {
  animation: popBurst 0.35s ease-out forwards !important;
}

.bubble-wrong-shake {
  animation: shakeAnim 0.35s ease-in-out !important;
}

/* 2. Mode Word Match / Connect Pairs */
.match-board-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 720px;
  margin: 24px auto;
}

.match-column {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.match-card {
  background: #ffffff;
  border: 2px solid var(--border-light);
  border-radius: 14px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: var(--shadow-xs);
  min-height: 52px;
}

.match-card:hover {
  border-color: var(--pink-primary);
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}

.match-card.selected {
  border-color: var(--pink-primary);
  background: #fff0f5;
  box-shadow: 0 4px 18px var(--pink-shadow);
  transform: scale(1.02);
}

.match-card.matched {
  border-color: var(--teal-primary);
  background: var(--teal-soft);
  color: var(--teal-primary);
  opacity: 0.3;
  pointer-events: none;
  transform: scale(0.95);
  transition: all 0.4s ease-out;
}

.match-card.wrong {
  border-color: #ef4444;
  background: #fef2f2;
  animation: shakeAnim 0.35s;
}

/* 3. Mode Speed Typing */
.speed-typing-arena {
  text-align: center;
  max-width: 580px;
  margin: 24px auto;
}

.speed-word-display {
  padding: 24px;
  background: linear-gradient(135deg, #fff5f8, #f0fdfa);
  border-radius: 24px;
  border: 1.5px solid var(--pink-border);
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
}

.speed-hanzi {
  font-size: 72px;
  font-weight: 900;
  color: var(--text-main);
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.1;
}

.speed-meaning {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-secondary);
  margin-top: 8px;
}

.speed-input-wrapper {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.speed-input-box {
  flex: 1;
  padding: 14px 20px;
  font-size: 18px;
  font-weight: 800;
  border-radius: 14px;
  border: 2px solid var(--pink-primary);
  outline: none;
  font-family: inherit;
  box-shadow: 0 4px 16px var(--pink-shadow);
  transition: all 0.2s;
}

.speed-input-box:focus {
  border-color: var(--pink-primary-hover);
  box-shadow: 0 0 0 4px rgba(255, 82, 123, 0.2);
}

.speed-quick-hints {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 16px;
}

.speed-hint-btn {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s;
}

.speed-hint-btn:hover {
  border-color: var(--pink-primary);
  color: var(--pink-primary);
  background: var(--pink-soft);
}

/* 4. Mode Audio Listening */
.listen-arena-box {
  text-align: center;
  max-width: 640px;
  margin: 24px auto;
}

.listen-big-speaker {
  width: 105px;
  height: 105px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--cyan-primary), #0ea5e9);
  border: none;
  color: #ffffff;
  font-size: 42px;
  cursor: pointer;
  box-shadow: 0 12px 32px rgba(2, 132, 199, 0.35);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.listen-big-speaker:hover {
  transform: scale(1.1);
  box-shadow: 0 16px 36px rgba(2, 132, 199, 0.45);
}

.listen-options-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.listen-option-card {
  background: #ffffff;
  border: 2px solid var(--border-light);
  border-radius: 16px;
  padding: 18px 20px;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-xs);
}

.listen-option-card:hover {
  border-color: var(--cyan-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.listen-opt-hz {
  font-size: 24px;
  font-weight: 900;
  color: var(--text-main);
  font-family: 'Noto Sans SC', sans-serif;
}

.listen-opt-py {
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan-primary);
}

.listen-opt-meaning {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* Modal Summary */
.game-summary-modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.3s;
}

.game-summary-card {
  background: #ffffff;
  border-radius: 24px;
  max-width: 780px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  padding: 32px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
  border: 1.5px solid var(--pink-border);
}

.game-summary-header {
  text-align: center;
  margin-bottom: 24px;
}

.summary-trophy {
  font-size: 54px;
  margin-bottom: 8px;
}

.game-summary-header h3 {
  font-size: 24px;
  font-weight: 900;
  color: var(--text-main);
}

.game-summary-header p {
  font-size: 14px;
  color: var(--text-muted);
}

.summary-metrics-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.summary-metric-card {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 14px;
  text-align: center;
}

.summary-metric-card .metric-val {
  font-size: 22px;
  font-weight: 900;
  color: var(--pink-primary);
}

.summary-metric-card .metric-lbl {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  margin-top: 4px;
}

.summary-vocab-review {
  margin-bottom: 24px;
}

.summary-vocab-review h4 {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 10px;
}

.summary-table-scroll {
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid var(--border-light);
  border-radius: 12px;
}

.summary-review-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.summary-review-table th {
  background: var(--bg-subtle);
  padding: 8px 12px;
  text-align: left;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 2;
}

.summary-review-table td {
  padding: 8px 12px;
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
  vertical-align: middle;
}

.summary-actions-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Animations */
@keyframes floatBubble {
  0% { transform: translateY(0px) rotate(0deg); }
  100% { transform: translateY(-12px) rotate(2deg); }
}

@keyframes popBurst {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.8; filter: brightness(1.6); }
  100% { transform: scale(0); opacity: 0; }
}

@keyframes pulseGlow {
  0% { transform: scale(1); filter: brightness(1); }
  100% { transform: scale(1.06); filter: brightness(1.2); }
}

@keyframes shakeAnim {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-8px); }
  40%, 80% { transform: translateX(8px); }
}

/* PRINT & PDF EXPORT MEDIA STYLES */
@media print {
  body {
    background: #ffffff !important;
    color: #000000 !important;
  }

  .app-header,
  .navigation-bar,
  .notebook-toolbar,
  .header-actions,
  .card-actions-row,
  .action-btn,
  .filter-btn-pill,
  .pagination-row,
  footer,
  .modal-overlay {
    display: none !important;
  }

  .main-viewport {
    padding: 0 !important;
    max-width: 100% !important;
  }

  .tab-pane:not(#pane_notebook) {
    display: none !important;
  }

  #pane_notebook {
    display: block !important;
  }

  .print-report-header {
    display: block !important;
    text-align: center;
    border-bottom: 2px solid #000;
    padding-bottom: 14px;
    margin-bottom: 20px;
  }

  .print-report-header h1 {
    font-size: 22pt;
    font-weight: 800;
    color: #000;
  }

  .print-report-header p {
    font-size: 11pt;
    color: #444;
  }

  .notebook-table {
    border: 1px solid #000 !important;
    width: 100% !important;
  }

  .notebook-table th {
    background: #eee !important;
    color: #000 !important;
    border: 1px solid #000 !important;
    font-size: 10pt !important;
  }

  .notebook-table td {
    border: 1px solid #ccc !important;
    font-size: 10.5pt !important;
    color: #000 !important;
  }

  .notebook-practice-col {
    display: table-cell !important;
    width: 140px;
    border: 1px dashed #999 !important;
    text-align: center;
    vertical-align: middle;
  }

  .print-mizige-row {
    display: flex !important;
    gap: 4px;
    justify-content: center;
    align-items: center;
  }

  .print-mizige-box {
    width: 34px;
    height: 34px;
    border: 1px solid #555;
    position: relative;
    display: inline-block;
  }

  .print-mizige-box::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    border-top: 1px dashed #aaa;
  }

  .print-mizige-box::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    height: 100%;
    border-left: 1px dashed #aaa;
  }
}

/* ==========================================================================
   MODULE: 1.000 CÂU SẮP XẾP TỪ & VIẾT PINYIN (HSK 3 - 9)
   ========================================================================== */
.unscramble-container {
  max-width: 1060px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.unscramble-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-surface);
  border-radius: 18px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  flex-wrap: wrap;
  gap: 12px;
}

.unscramble-direction-badge {
  background: var(--cyan-soft);
  border: 1.5px solid var(--cyan-border);
  color: var(--cyan-primary);
  font-weight: 800;
  padding: 8px 18px;
  border-radius: 24px;
  font-size: 13.5px;
  display: flex;
  align-items: center;
  gap: 8px;
  letter-spacing: 0.5px;
}

.unscramble-filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  background: rgba(255, 255, 255, 0.7);
  padding: 8px 14px;
  border-radius: 14px;
  border: 1px solid var(--border-pink-subtle);
}

.unscramble-question-card {
  background: #ffffff;
  border-radius: 24px;
  padding: 32px 36px;
  border: 1.5px solid var(--border-pink-subtle);
  box-shadow: var(--shadow-md);
  position: relative;
  text-align: center;
  transition: all 0.3s ease;
}

.unscramble-meta-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 10px;
}

.unscramble-vi-prompt {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.55;
  color: var(--text-main);
  margin: 16px 0;
  font-style: italic;
  font-family: var(--font-sans);
  position: relative;
  padding: 0 16px;
}

.unscramble-vi-prompt::before {
  content: '“';
  font-size: 38px;
  color: var(--pink-primary);
  font-family: serif;
  vertical-align: -8px;
  margin-right: 4px;
}

.unscramble-vi-prompt::after {
  content: '”';
  font-size: 38px;
  color: var(--pink-primary);
  font-family: serif;
  vertical-align: -8px;
  margin-left: 4px;
}

.unscramble-mode-tabs {
  display: inline-flex;
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 14px;
  padding: 4px;
  gap: 4px;
  margin-top: 10px;
}

.unscramble-mode-btn {
  padding: 8px 16px;
  border-radius: 10px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 13px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.unscramble-mode-btn.active {
  background: #ffffff;
  color: var(--pink-primary);
  box-shadow: var(--shadow-xs);
  border: 1px solid var(--pink-border);
}

/* Slots row */
.unscramble-slots-area {
  min-height: 84px;
  padding: 16px 20px;
  background: var(--pink-soft);
  border: 2px dashed var(--pink-border);
  border-radius: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: center;
  margin: 24px 0 16px;
  transition: all 0.25s ease;
}

.unscramble-slots-area.correct {
  background: #f0fdf4;
  border-color: #86efac;
}

.unscramble-slots-area.incorrect {
  background: #fff1f2;
  border-color: #fca5a5;
  animation: shakeAnim 0.4s ease;
}

.unscramble-slot-empty-hint {
  color: var(--text-muted);
  font-size: 14px;
  font-style: italic;
}

.unscramble-slot-tile {
  background: #ffffff;
  color: var(--text-main);
  border: 1.5px solid var(--pink-border);
  border-radius: 12px;
  padding: 10px 18px;
  font-family: var(--font-hanzi);
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
}

.unscramble-slot-tile:hover {
  transform: translateY(-2px);
  border-color: var(--pink-primary);
  color: var(--pink-primary);
}

/* Word bank */
.unscramble-wordbank-box {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  padding: 20px;
  background: var(--bg-surface);
  border-radius: 22px;
  border: 1.5px solid var(--border-light);
  min-height: 100px;
  margin-bottom: 24px;
}

.unscramble-bank-tile {
  background: #ffffff;
  color: var(--text-main);
  border: 1.5px solid var(--border-light);
  border-radius: 14px;
  padding: 12px 22px;
  font-family: var(--font-hanzi);
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  user-select: none;
}

.unscramble-bank-tile:hover {
  transform: scale(1.06);
  border-color: var(--cyan-primary);
  color: var(--cyan-primary);
  box-shadow: 0 8px 18px rgba(2, 132, 199, 0.15);
}

.unscramble-bank-tile:active {
  transform: scale(0.95);
}

.unscramble-bank-tile.used {
  opacity: 0.2;
  pointer-events: none;
  transform: scale(0.92);
  filter: grayscale(1);
}

/* Pinyin Input Mode */
.unscramble-pinyin-pane {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 680px;
  margin: 20px auto;
}

.pinyin-input-large {
  width: 100%;
  padding: 14px 20px;
  font-size: 20px;
  font-weight: 600;
  border-radius: 16px;
  border: 2px solid var(--cyan-border);
  background: #ffffff;
  outline: none;
  text-align: center;
  color: var(--text-main);
  font-family: var(--font-sans);
  transition: all 0.2s ease;
}

.pinyin-input-large:focus {
  border-color: var(--cyan-primary);
  box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.12);
}

.pinyin-tone-bar {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
  background: var(--bg-subtle);
  padding: 8px 12px;
  border-radius: 12px;
  border: 1px solid var(--border-light);
}

.tone-pill-btn {
  padding: 5px 10px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.tone-pill-btn:hover {
  background: var(--cyan-soft);
  color: var(--cyan-primary);
  border-color: var(--cyan-border);
  transform: translateY(-1px);
}

/* Feedback & Grammar banner */
.unscramble-feedback-banner {
  padding: 16px 20px;
  border-radius: 16px;
  display: none;
  margin-top: 16px;
  text-align: left;
  line-height: 1.6;
}

.unscramble-feedback-banner.show-correct {
  display: block;
  background: #f0fdf4;
  border: 1.5px solid #86efac;
  color: #166534;
}

.unscramble-feedback-banner.show-incorrect {
  display: block;
  background: #fff1f2;
  border: 1.5px solid #fca5a5;
  color: #991b1b;
}

/* Action button row */
.unscramble-actions-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

/* ==========================================================================
   MODULE: SỔ TAY TỪ VỰNG - TẬP VIẾT CẢ CỤM TỪ (PHRASE WRITER STUDIO)
   ========================================================================== */
.phrase-writer-modal-card {
  background: #ffffff;
  border-radius: 28px;
  padding: 32px 36px;
  max-width: 960px;
  width: 94%;
  max-height: 90vh;
  overflow-y: auto;
  border: 1.5px solid var(--border-pink-subtle);
  box-shadow: var(--shadow-lg);
  position: relative;
  text-align: center;
}

.phrase-writer-scroll-row {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  margin: 24px 0;
  padding: 10px;
}

.phrase-char-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.phrase-mizige-wrapper {
  width: 170px;
  height: 170px;
  position: relative;
  background: #ffffff;
  border: 2px solid var(--pink-border);
  border-radius: 18px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s ease;
}

.phrase-mizige-wrapper.active-quiz {
  border-color: var(--pink-primary);
  box-shadow: 0 0 0 4px rgba(255, 82, 123, 0.2);
  transform: scale(1.03);
}

.phrase-char-target {
  width: 170px;
  height: 170px;
  position: relative;
  z-index: 2;
}

.phrase-char-label {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-secondary);
}

.phrase-char-label span {
  color: var(--pink-primary);
}

/* ==========================================================================
   DEVELOPER CREDIT BADGE & LOGO (PHUONG THAO DOAN)
   ========================================================================== */
.developer-credit-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 14px;
  border-radius: 20px;
  background: linear-gradient(135deg, #fff0f3, #ffe4e9);
  border: 1px solid #ffccd5;
  color: #d81b60;
  font-size: 12.5px;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(255, 82, 123, 0.12);
  transition: all 0.25s ease;
  user-select: none;
}

.developer-credit-badge strong {
  color: #b7094c;
  font-weight: 800;
}

.developer-credit-badge:hover {
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(255, 82, 123, 0.2);
  background: linear-gradient(135deg, #ffe4e9, #ffccd5);
}

.developer-credit-badge.footer-credit {
  font-size: 13.5px;
  padding: 8px 22px;
  border-radius: 24px;
}

/* ==========================================================================
   SCIENTIFIC 577 GRAMMAR SUITE CARDS & COMPONENTS
   ========================================================================== */
.grammar-detail-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.grammar-header-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  padding: 24px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.grammar-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.grammar-title-text {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.45;
}

.grammar-title-text .zh-highlight {
  color: var(--pink-primary);
  font-family: var(--font-hanzi);
}

.grammar-title-text .py-highlight {
  color: var(--cyan-primary);
  font-size: 17px;
  font-weight: 700;
}

.grammar-actions-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.grammar-concept-card {
  background: linear-gradient(135deg, #f0fdf4, #f8fafc);
  border: 1.5px solid #bbf7d0;
  border-radius: 16px;
  padding: 16px 20px;
}

.grammar-concept-title {
  font-size: 13px;
  font-weight: 800;
  color: #15803d;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.grammar-concept-body {
  font-size: 15px;
  font-weight: 600;
  color: #166534;
  line-height: 1.6;
}

.grammar-formula-wrapper {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.grammar-formula-chip-card {
  background: linear-gradient(135deg, #eff6ff, #f8fafc);
  border: 1.5px solid #bfdbfe;
  border-radius: 14px;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.formula-label-tag {
  background: #2563eb;
  color: #ffffff;
  font-size: 11.5px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: 8px;
  text-transform: uppercase;
  flex-shrink: 0;
}

.formula-tokens-text {
  font-size: 16px;
  font-weight: 800;
  color: #1e40af;
  letter-spacing: 0.2px;
}

.grammar-diff-section {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 18px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.grammar-same-box {
  background: #fefce8;
  border-left: 4px solid #eab308;
  padding: 12px 16px;
  border-radius: 0 12px 12px 0;
  font-size: 14px;
  color: #854d0e;
  line-height: 1.6;
  margin-bottom: 16px;
}

.grammar-diff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.grammar-diff-card {
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-light);
  border-radius: 14px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: all 0.2s ease;
}

.grammar-diff-card:hover {
  border-color: var(--pink-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.diff-card-word {
  font-family: var(--font-hanzi);
  font-size: 22px;
  font-weight: 800;
  color: var(--pink-primary);
}

.diff-card-pinyin {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--cyan-primary);
}

.diff-card-desc {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.grammar-rules-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.grammar-rule-item-box {
  background: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.65;
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.grammar-rule-bullet {
  background: var(--pink-soft);
  color: var(--pink-primary);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 2px;
}

.grammar-examples-grid-v2 {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.grammar-example-card-v2 {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 16px;
  padding: 18px 22px;
  transition: all 0.2s ease;
  position: relative;
}

.grammar-example-card-v2:hover {
  border-color: var(--cyan-border);
  box-shadow: var(--shadow-sm);
}

.ex-v2-zh {
  font-family: var(--font-hanzi);
  font-size: 19px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.5;
}

.ex-v2-py {
  font-size: 14.5px;
  font-weight: 700;
  color: var(--cyan-primary);
  margin: 4px 0 6px;
}

.ex-v2-vi {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   GRAMMAR NOTEBOOK (SỔ TAY NGỮ PHÁP)
   ========================================================================== */
.grammar-notebook-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.grammar-notebook-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 18px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.grammar-notebook-card:hover {
  border-color: var(--pink-border);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ==========================================================================
   EXAM SIMULATOR STUDIO (BỘ ĐỀ THI MÔ PHỎNG NNT ĐH HUẾ)
   ========================================================================== */
.exam-arena-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
}

.exam-timer-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 30px;
  background: #fee2e2;
  border: 1.5px solid #fca5a5;
  color: #b91c1c;
  font-weight: 800;
  font-size: 15px;
}

.exam-question-item {
  background: var(--bg-subtle);
  border: 1px solid var(--border-light);
  border-radius: 16px;
  padding: 20px;
  margin-bottom: 16px;
  transition: all 0.2s ease;
}

.exam-question-item.answered {
  border-color: var(--teal-border);
  background: #f0fdfa;
}

.exam-choice-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1.5px solid var(--border-light);
  background: #ffffff;
  margin-top: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14.5px;
}

.exam-choice-option:hover {
  border-color: var(--cyan-border);
  background: var(--cyan-soft);
}

.exam-choice-option.selected {
  border-color: var(--pink-primary);
  background: var(--pink-soft);
  font-weight: 700;
  color: var(--pink-primary);
}

.exam-scan-preview-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(6px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.exam-scan-preview-modal.show {
  display: flex;
}

/* ==========================================================================
   THÀNH CÔNG CHI LỘ: VOCABULARY LEVEL ANALYSIS, DICTIONARY & COMPREHENSION
   ========================================================================== */
.article-word-clickable {
  cursor: pointer;
  border-bottom: 1.5px dashed rgba(2, 132, 199, 0.5);
  border-radius: 4px;
  padding: 1px 3px;
  transition: all 0.18s ease;
  color: var(--text-main);
  display: inline-block;
}

.article-word-clickable:hover {
  background: #fdf2f8;
  color: var(--pink-primary);
  border-bottom-color: var(--pink-primary);
  transform: translateY(-1px);
}

/* Curriculum Lesson Subtabs */
.curriculum-subtab-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-subtle);
  border: 1.5px solid var(--border-light);
  border-radius: 16px;
  margin: 28px 0 20px 0;
  flex-wrap: wrap;
}

.curriculum-subtab-btn {
  padding: 8px 18px;
  border-radius: 10px;
  border: none;
  background: transparent;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}

.curriculum-subtab-btn:hover {
  background: #ffffff;
  color: var(--text-main);
}

.curriculum-subtab-btn.active {
  background: #ffffff;
  color: var(--pink-primary);
  box-shadow: var(--shadow-sm);
  font-weight: 800;
}

/* Vocab Level Filter Chips */
.vocab-level-filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.vocab-level-chip {
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 700;
  border: 1.5px solid var(--border-light);
  background: #ffffff;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.vocab-level-chip:hover {
  border-color: var(--cyan-border);
  color: var(--cyan-primary);
}

.vocab-level-chip.active {
  background: var(--pink-primary);
  border-color: var(--pink-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(255, 82, 123, 0.3);
}

/* Vocab Analysis Grid & Cards */
.curriculum-vocab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 14px;
}

.curriculum-vocab-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 16px;
  padding: 18px;
  transition: all 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-xs);
}

.curriculum-vocab-card:hover {
  transform: translateY(-3px);
  border-color: var(--pink-primary);
  box-shadow: var(--shadow-md);
}

.curriculum-vocab-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 8px;
}

.curriculum-vocab-hz {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-main);
  font-family: 'Noto Sans SC', sans-serif;
  cursor: pointer;
}

.curriculum-vocab-hz:hover {
  color: var(--pink-primary);
}

.curriculum-vocab-py {
  font-size: 14px;
  font-weight: 700;
  color: var(--pink-primary);
  margin-bottom: 4px;
}

.curriculum-vocab-meaning {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.45;
  margin-bottom: 12px;
}

/* Reading Comprehension Questions Section */
.curriculum-question-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 18px;
  padding: 22px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-xs);
  transition: all 0.2s ease;
}

.curriculum-question-card:hover {
  border-color: rgba(2, 132, 199, 0.35);
}

.curriculum-question-prompt {
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.55;
  margin-bottom: 16px;
  font-family: 'Noto Sans SC', sans-serif;
}

.curriculum-choice-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1.5px solid var(--border-light);
  background: #ffffff;
  margin-bottom: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 14.5px;
  line-height: 1.45;
}

.curriculum-choice-item:hover {
  background: var(--bg-subtle);
  border-color: var(--cyan-border);
}

.curriculum-choice-item.correct {
  background: #f0fdf4 !important;
  border-color: #22c55e !important;
  color: #166534;
  font-weight: 700;
}

.curriculum-choice-item.wrong {
  background: #fef2f2 !important;
  border-color: #ef4444 !important;
  color: #991b1b;
}

/* Quick Dictionary Modal */
.curriculum-dict-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(8px);
  z-index: 10000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease-out;
}

.curriculum-dict-modal.show {
  display: flex;
}

.curriculum-dict-box {
  background: #ffffff;
  border-radius: 24px;
  max-width: 680px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  border: 1.5px solid rgba(255, 255, 255, 0.8);
  padding: 28px;
  position: relative;
  display: flex;
  flex-direction: column;
}

.dict-chip-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  margin: 4px 6px 4px 0;
  transition: all 0.2s ease;
}

.dict-chip-synonym {
  background: #f0fdf4;
  border: 1.5px solid #86efac;
  color: #166534;
  cursor: pointer;
}

.dict-chip-synonym:hover {
  background: #dcfce7;
  transform: translateY(-1px);
}

.dict-chip-antonym {
  background: #fef2f2;
  border: 1.5px solid #fca5a5;
  color: #991b1b;
  cursor: pointer;
}

.dict-chip-antonym:hover {
  background: #fee2e2;
  transform: translateY(-1px);
}

/* ==========================================================================
   MODULE: 1.000 CÂU SỬA LỖI SAI NGỮ PHÁP HSK (HSK 病句诊断与修改)
   ========================================================================== */
.err-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 20px;
  padding: 24px;
  margin-bottom: 22px;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s ease;
}

.err-card:hover {
  border-color: rgba(2, 132, 199, 0.4);
  box-shadow: var(--shadow-md);
}

.err-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--border-light);
}

.err-wrong-box {
  background: #fff1f2;
  border: 1.5px solid #fecdd3;
  border-radius: 14px;
  padding: 14px 18px;
  margin-bottom: 16px;
}

.err-wrong-title {
  font-size: 12px;
  font-weight: 800;
  color: #e11d48;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.err-wrong-text {
  font-size: 18px;
  font-weight: 800;
  color: #9f1239;
  font-family: var(--font-hanzi);
  line-height: 1.5;
}

.err-options-grid {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.err-option-btn {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1.5px solid var(--border-light);
  background: #ffffff;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 15px;
  line-height: 1.5;
  text-align: left;
  color: var(--text-main);
  width: 100%;
}

.err-option-btn:hover {
  background: var(--bg-subtle);
  border-color: var(--cyan-border);
}

.err-option-btn.correct {
  background: #f0fdf4 !important;
  border-color: #22c55e !important;
  color: #166534;
  font-weight: 700;
}

.err-option-btn.wrong {
  background: #fef2f2 !important;
  border-color: #ef4444 !important;
  color: #991b1b;
}

.err-expl-box {
  background: #f8fafc;
  border-radius: 14px;
  padding: 16px 20px;
  margin-top: 14px;
  border-left: 4px solid var(--cyan-primary);
  font-size: 13.5px;
  line-height: 1.6;
}

.err-grammar-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: linear-gradient(135deg, #eff6ff, #f0f9ff);
  border: 1.5px solid #93c5fd;
  color: #1d4ed8;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: all 0.2s ease;
}

.err-grammar-link-btn:hover {
  background: #dbeafe;
  transform: translateY(-1.5px);
  box-shadow: 0 4px 12px rgba(29, 78, 216, 0.15);
}

/* ==========================================================================
   MODULE: TRUYỆN CHÊM TRUNG - TRUNG & PHÂN TÍCH TỪ VỰNG NGỮ PHÁP ĐẮT GIÁ
   ========================================================================== */
.story-mode-toggle-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-subtle);
  padding: 6px;
  border-radius: 14px;
  border: 1px solid var(--border-light);
  margin-bottom: 18px;
}

.story-mode-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 10px;
  border: none;
  background: transparent;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.story-mode-btn.active {
  background: #ffffff;
  color: var(--pink-primary);
  font-weight: 800;
  box-shadow: var(--shadow-sm);
}

.story-pure-chinese-box {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 18px;
  padding: 28px;
  margin-bottom: 24px;
}

.story-pure-paragraph {
  font-size: 19px;
  line-height: 1.9;
  color: var(--text-main);
  font-family: var(--font-hanzi);
  margin-bottom: 20px;
}

.story-gold-section {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1.5px dashed var(--border-light);
}

.story-gold-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
  margin-top: 14px;
}

.story-gold-vocab-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow-xs);
  transition: all 0.2s ease;
}

.story-gold-vocab-card:hover {
  border-color: var(--pink-border);
  box-shadow: var(--shadow-sm);
}

.story-gold-grammar-card {
  background: linear-gradient(135deg, #f8fafc, #f1f5f9);
  border: 1.5px solid #cbd5e1;
  border-radius: 16px;
  padding: 18px 20px;
  margin-bottom: 14px;
  transition: all 0.2s ease;
}

.story-gold-grammar-card:hover {
  border-color: #94a3b8;
  background: #ffffff;
}

/* --------------------------------------------------------------------------
   STORY COMPOUND & SINGLE CHAR SMART LOOKUP
   -------------------------------------------------------------------------- */
.story-word-compound {
  display: inline-block;
  padding: 1px 3px;
  margin: 0 1px;
  border-radius: 6px;
  border-bottom: 2px solid rgba(255, 71, 133, 0.45);
  background: rgba(255, 71, 133, 0.05);
  cursor: pointer;
  transition: all 0.18s ease;
  user-select: text;
}

.story-word-compound:hover {
  background: rgba(255, 71, 133, 0.18);
  border-bottom-color: var(--pink-primary);
  color: var(--pink-primary);
  transform: translateY(-1px);
}

.story-char-unit {
  display: inline-block;
  padding: 0 1px;
  border-radius: 4px;
  transition: all 0.15s ease;
}

.story-char-unit:hover {
  background: rgba(6, 182, 212, 0.25);
  color: var(--cyan-primary);
  text-decoration: underline;
}

/* In Single Character Mode */
.article-word-clickable.char-mode {
  padding: 1px 3px;
  margin: 0 1px;
  border-bottom: 1.5px dotted rgba(6, 182, 212, 0.5);
  border-radius: 4px;
}

.article-word-clickable.char-mode:hover {
  background: rgba(6, 182, 212, 0.2);
  color: var(--cyan-primary);
  border-bottom-color: var(--cyan-primary);
}

/* Dict Modal Decomposed Single Character Cards */
.dict-decomp-card {
  background: #ffffff;
  border: 1px solid #fecdd3;
  border-radius: 12px;
  padding: 12px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  transition: all 0.18s ease;
}

.dict-decomp-card:hover {
  border-color: var(--pink-primary);
  box-shadow: 0 3px 8px rgba(255, 71, 133, 0.15);
  transform: translateY(-1px);
}

.dict-decomp-char {
  font-family: var(--font-hanzi);
  font-size: 28px;
  font-weight: 900;
  color: var(--pink-primary);
  line-height: 1;
  min-width: 32px;
  text-align: center;
}

/* Dict Modal Related Compound Chips */
.dict-compound-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #f0fdfa;
  border: 1px solid #99f6e4;
  color: #0f766e;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.18s ease;
  user-select: none;
}

.dict-compound-chip:hover {
  background: #ccfbf1;
  border-color: #2dd4bf;
  color: #115e59;
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(15, 118, 110, 0.15);
}

.dict-compound-chip b {
  font-family: var(--font-hanzi);
  font-size: 15px;
  font-weight: 700;
}

/* ==========================================================================
   MODULE: LUYỆN NGHE NÓI & AI TUTOR (BAOLINGO & DUANFANGCAOXUEXIHANYU)
   ========================================================================== */

/* Sub-tab Navigation Bar */
.ai-subtab-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.9);
  padding: 8px 12px;
  border-radius: 16px;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.ai-subtab-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 12px;
  border: 1.5px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  font-size: 14.5px;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.ai-subtab-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-main);
}

.ai-subtab-btn.active {
  background: linear-gradient(135deg, #fff0f5 0%, #ffe4ec 100%);
  border-color: var(--pink-primary);
  color: var(--pink-primary);
  box-shadow: 0 4px 14px rgba(255, 82, 123, 0.18);
}

.ai-subtab-btn .badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.06);
  font-weight: 800;
}

.ai-subtab-btn.active .badge {
  background: var(--pink-primary);
  color: #fff;
}

/* Hero YouTube Creator Box (Baolingo Style) */
.yt-creator-card {
  background: linear-gradient(135deg, #fff1f2 0%, #fff7ed 50%, #f0fdfa 100%);
  border: 2px solid #fecdd3;
  border-radius: 20px;
  padding: 28px;
  margin-bottom: 28px;
  box-shadow: 0 10px 30px rgba(244, 63, 94, 0.08);
}

.yt-creator-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.yt-creator-header .icon-yt {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: #ff0000;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 6px 16px rgba(255, 0, 0, 0.3);
}

.yt-creator-input-row {
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.yt-creator-input {
  flex: 1;
  min-width: 280px;
  padding: 14px 18px;
  border-radius: 14px;
  border: 2px solid #fda4af;
  background: #ffffff;
  font-size: 15px;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.yt-creator-input:focus {
  border-color: var(--pink-primary);
  box-shadow: 0 0 0 4px rgba(255, 82, 123, 0.2);
}

.btn-create-lesson {
  padding: 14px 28px;
  border-radius: 14px;
  background: linear-gradient(135deg, #e11d48 0%, #be123c 100%);
  color: #fff;
  font-size: 15px;
  font-weight: 800;
  border: none;
  cursor: pointer;
  box-shadow: 0 6px 20px rgba(225, 29, 72, 0.35);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.18s, box-shadow 0.18s;
}

.btn-create-lesson:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(225, 29, 72, 0.45);
}

/* Video Lessons Grid Cards */
.video-lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 22px;
  margin-top: 20px;
}

.video-lesson-card {
  background: #ffffff;
  border-radius: 18px;
  border: 1px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.video-lesson-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--pink-border);
}

.video-thumb-wrapper {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 Aspect Ratio */
  background: #0f172a;
  overflow: hidden;
}

.video-thumb-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.video-lesson-card:hover .video-thumb-wrapper img {
  transform: scale(1.05);
}

.video-duration-tag {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 11.5px;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 6px;
}

.video-level-tag {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 11.5px;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.video-play-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.video-lesson-card:hover .video-play-overlay {
  opacity: 1;
}

.play-circle-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--pink-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 4px 20px rgba(255, 82, 123, 0.5);
  padding-left: 4px;
}

.video-card-body {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.video-channel-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.video-card-title {
  font-size: 15.5px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.4;
  margin: 0 0 8px 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin: 0 0 16px 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}

.video-card-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  border-top: 1px dashed var(--border-light);
  padding-top: 12px;
}

.card-action-btn {
  padding: 8px 12px;
  border-radius: 10px;
  font-size: 12.5px;
  font-weight: 700;
  border: 1px solid var(--border-light);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.card-action-btn:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

/* Modal Shadowing Player (Interactive Split-View) */
.shadowing-player-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  z-index: 99999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.shadowing-player-box {
  background: #ffffff;
  border-radius: 24px;
  width: 100%;
  max-width: 1320px;
  height: 92vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.shadowing-player-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: #ffffff;
}

.shadowing-split-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  flex: 1;
  overflow: hidden;
}

@media (max-width: 980px) {
  .shadowing-split-layout {
    grid-template-columns: 1fr;
    grid-template-rows: 280px 1fr;
  }
}

.shadowing-video-side {
  background: #0f172a;
  padding: 20px;
  display: flex;
  flex-direction: column;
}

.shadowing-video-container {
  width: 100%;
  flex: 1;
  position: relative;
  min-height: 320px;
}

.shadowing-subtitles-side {
  background: #f8fafc;
  border-left: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.subtitles-scroll-container {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Subtitle Item Card */
.subtitle-item-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 14px;
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

.subtitle-item-card:hover {
  border-color: #cbd5e1;
  transform: translateY(-1px);
}

.subtitle-item-card.active {
  border-color: var(--pink-primary);
  background: #fffbfa;
  box-shadow: 0 6px 18px rgba(255, 82, 123, 0.15);
}

.sub-item-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.sub-index-badge {
  font-size: 11px;
  font-weight: 800;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 2px 6px;
  border-radius: 4px;
}

.sub-time-tag {
  font-size: 12px;
  font-weight: 700;
  color: var(--cyan-primary);
  margin-left: 8px;
}

.sub-actions-right {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.sub-mini-btn {
  font-size: 11.5px;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-light);
  background: #fff;
  cursor: pointer;
  color: var(--text-secondary);
  transition: all 0.15s ease;
}

.sub-mini-btn:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  border-color: var(--pink-border);
}

.btn-mic-sub {
  background: #fff1f2;
  border-color: #fecdd3;
  color: #e11d48;
}

.sub-zh-text {
  font-family: var(--font-hanzi);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 4px;
}

.sub-py-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--cyan-primary);
  margin-bottom: 4px;
}

.sub-vi-text {
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.interactive-char {
  cursor: pointer;
  padding: 0 1px;
  border-radius: 4px;
  transition: background 0.15s, color 0.15s;
}

.interactive-char:hover {
  background: var(--pink-soft);
  color: var(--pink-primary);
  text-decoration: underline;
}

/* Dictation Input */
.dictation-input {
  flex: 1;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-light);
  font-size: 13px;
  outline: none;
}

.dictation-input:focus {
  border-color: var(--cyan-primary);
}

/* ==========================================================================
   AI PRONUNCIATION SCORING STUDIO (1.000 CÂU KHẨU NGỮ HSK)
   ========================================================================== */
.speaking-practice-card {
  background: #ffffff;
  border-radius: 24px;
  border: 1.5px solid var(--border-light);
  padding: 36px 32px;
  box-shadow: var(--shadow-md);
  max-width: 900px;
  margin: 0 auto;
}

.speaking-card-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.speaking-index-tag {
  font-size: 14px;
  font-weight: 800;
  color: var(--text-muted);
}

.speaking-target-zh {
  font-family: var(--font-hanzi);
  font-size: 34px;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 10px;
  text-align: center;
}

.speaking-target-py {
  font-size: 20px;
  font-weight: 700;
  color: var(--cyan-primary);
  margin-bottom: 8px;
  text-align: center;
}

.speaking-target-vi {
  font-size: 16px;
  color: var(--text-secondary);
  font-style: italic;
  text-align: center;
  margin-bottom: 28px;
}

/* Big Mic Arena & Waveform */
.speaking-record-arena {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 24px;
  background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
  border-radius: 20px;
  border: 1px dashed var(--border-light);
  margin-bottom: 24px;
}

.big-mic-btn {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--pink-primary) 0%, #e11d48 100%);
  color: #fff;
  border: none;
  font-size: 36px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 25px rgba(255, 82, 123, 0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}

.big-mic-btn:hover {
  transform: scale(1.06);
  box-shadow: 0 14px 30px rgba(255, 82, 123, 0.5);
}

.big-mic-btn.recording {
  background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  animation: pulseRecording 1.4s infinite;
  box-shadow: 0 0 0 12px rgba(239, 68, 68, 0.25);
}

@keyframes pulseRecording {
  0% { transform: scale(1); }
  50% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

.mic-status-label {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-secondary);
}

/* Waveform Bars */
.audio-waveform-bars {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 36px;
}

.wave-bar {
  width: 5px;
  height: 100%;
  background: var(--pink-primary);
  border-radius: 4px;
  animation: waveBarAnim 1s ease-in-out infinite alternate;
}

.wave-bar:nth-child(2) { animation-delay: 0.15s; height: 75%; }
.wave-bar:nth-child(3) { animation-delay: 0.3s; height: 90%; }
.wave-bar:nth-child(4) { animation-delay: 0.45s; height: 60%; }
.wave-bar:nth-child(5) { animation-delay: 0.2s; height: 100%; }
.wave-bar:nth-child(6) { animation-delay: 0.35s; height: 80%; }
.wave-bar:nth-child(7) { animation-delay: 0.5s; height: 65%; }
.wave-bar:nth-child(8) { animation-delay: 0.25s; height: 85%; }
.wave-bar:nth-child(9) { animation-delay: 0.4s; height: 70%; }

@keyframes waveBarAnim {
  0% { transform: scaleY(0.3); }
  100% { transform: scaleY(1); }
}

/* AI Score Result Card */
.ai-score-card {
  background: #ffffff;
  border: 2px solid #86efac;
  border-radius: 18px;
  padding: 22px;
  display: flex;
  align-items: center;
  gap: 24px;
  box-shadow: 0 8px 24px rgba(22, 163, 74, 0.1);
  margin-bottom: 24px;
}

@media (max-width: 680px) {
  .ai-score-card {
    flex-direction: column;
    text-align: center;
  }
}

.score-circle-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100px;
}

.score-number-display {
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
  color: #16a34a;
}

.score-number-display.excellent { color: #16a34a; }
.score-number-display.good { color: #0284c7; }
.score-number-display.needs-practice { color: #ea580c; }

.score-grade-text {
  font-size: 13px;
  font-weight: 800;
  color: var(--text-muted);
  margin-top: 4px;
}

.score-details-right {
  flex: 1;
}

.word-by-word-comparison {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.score-char-pill {
  padding: 5px 10px;
  border-radius: 8px;
  font-family: var(--font-hanzi);
  font-size: 16px;
  font-weight: 700;
  border: 1px solid transparent;
}

.score-char-pill.correct {
  background: #dcfce7;
  color: #166534;
  border-color: #86efac;
}

.score-char-pill.warning {
  background: #fef9c3;
  color: #854d0e;
  border-color: #fde047;
}

.score-char-pill.wrong {
  background: #fee2e2;
  color: #991b1b;
  border-color: #fca5a5;
}

.ai-tutor-feedback-msg {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.5;
  background: var(--bg-subtle);
  padding: 10px 14px;
  border-radius: 10px;
}

.speaking-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-light);
  padding-top: 18px;
}

/* ==========================================================================
   AI TUTOR ROLEPLAY 1-1 (PHƯƠNG THẢO LÃO SƯ 🌸)
   ========================================================================== */
.roleplay-container {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  background: #ffffff;
  border-radius: 24px;
  border: 1.5px solid var(--border-light);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  min-height: 650px;
}

@media (max-width: 900px) {
  .roleplay-container {
    grid-template-columns: 1fr;
  }
}

.roleplay-sidebar {
  background: #f8fafc;
  border-right: 1px solid var(--border-light);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.roleplay-topic-card {
  background: #ffffff;
  border: 1.5px solid var(--border-light);
  border-radius: 14px;
  padding: 14px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.roleplay-topic-card:hover {
  border-color: var(--pink-border);
  transform: translateY(-2px);
}

.roleplay-topic-card.active {
  border-color: var(--pink-primary);
  background: #fff5f7;
  box-shadow: 0 4px 12px rgba(255, 82, 123, 0.15);
}

.roleplay-topic-card .topic-title {
  font-size: 14.5px;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 6px;
}

.roleplay-topic-card .topic-roles {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.roleplay-chat-arena {
  display: flex;
  flex-direction: column;
  height: 650px;
  background: #ffffff;
}

.roleplay-messages-box {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  background: #fdfefe;
}

.chat-message-bubble {
  display: flex;
  gap: 12px;
  max-width: 80%;
}

.chat-message-bubble.ai-bubble {
  align-self: flex-start;
}

.chat-message-bubble.user-bubble {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.chat-content {
  background: #f1f5f9;
  border-radius: 18px;
  padding: 14px 18px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.ai-bubble .chat-content {
  background: linear-gradient(135deg, #fff5f7 0%, #ffffff 100%);
  border: 1.5px solid #fecdd3;
  border-top-left-radius: 4px;
}

.user-bubble .chat-content {
  background: linear-gradient(135deg, #e0f2fe 0%, #ffffff 100%);
  border: 1.5px solid #bae6fd;
  border-top-right-radius: 4px;
}

.chat-name {
  font-size: 12px;
  font-weight: 800;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.chat-zh {
  font-family: var(--font-hanzi);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.4;
  margin-bottom: 4px;
}

.chat-py {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--cyan-primary);
  margin-bottom: 4px;
}

.chat-vi {
  font-size: 13px;
  color: var(--text-secondary);
}

.chat-footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
  padding-top: 6px;
  border-top: 1px dashed rgba(0, 0, 0, 0.08);
}

.chat-time {
  font-size: 11px;
  color: var(--text-muted);
}

.chat-tts-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  padding: 2px;
  opacity: 0.7;
  transition: opacity 0.15s;
}

.chat-tts-btn:hover {
  opacity: 1;
}

.roleplay-input-bar {
  border-top: 1px solid var(--border-light);
  padding: 16px 20px;
  background: #ffffff;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.roleplay-suggestions-row {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.suggestion-chip-btn {
  display: inline-flex;
  flex-direction: column;
  padding: 6px 12px;
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid var(--border-light);
  cursor: pointer;
  white-space: nowrap;
  font-size: 12.5px;
  color: var(--text-main);
  transition: all 0.15s ease;
  text-align: left;
}

.suggestion-chip-btn:hover {
  background: var(--pink-soft);
  border-color: var(--pink-border);
  color: var(--pink-primary);
}

.roleplay-controls-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.roleplay-text-input {
  flex: 1;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1.5px solid var(--border-light);
  font-size: 14.5px;
  outline: none;
}

.roleplay-text-input:focus {
  border-color: var(--pink-primary);
}

.roleplay-mic-btn {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1.5px solid #fda4af;
  background: #fff1f2;
  color: #e11d48;
  font-size: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.18s ease;
}

.roleplay-mic-btn:hover {
  background: #ffe4e6;
  transform: scale(1.05);
}

.roleplay-mic-btn.recording {
  background: #ef4444;
  color: #fff;
  animation: pulseRecording 1.4s infinite;
}