/* 
 * Phonics V2 Design System
 * Focus: Clarity, Premium Aesthetics, and Smooth Interactions
 */

/* Fonts: 微软雅黑优先（无外链）。
 * 注意：微软雅黑在 iOS/macOS 不一定存在，会回退到苹方/系统字体。
 */
:root {
  --font-sans: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", "Source Han Sans SC", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  --font-display: var(--font-sans);


  /* Color Palette - Premium & Soft */
  --p-50: #eff6ff;
  --p-100: #dbeafe;
  --p-500: #3b82f6;
  --p-600: #2563eb;
  --p-700: #1d4ed8;

  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-400: #94a3b8;
  --slate-600: #475569;
  --slate-900: #0f172a;

  /* Theme Tokens */
  --bg-main: var(--slate-50);
  --bg-card: #ffffff;
  --text-main: var(--slate-900);
  --text-muted: var(--slate-600);
  --border-soft: var(--slate-200);
  --accent: var(--p-600);
  --accent-soft: #e8f0ff;
  --surface-subtle: #f8fbff;

  /* Phoneme Colors - 彩虹渐变风格 */
  --phoneme-1: #3b82f6;
  /* 蓝色 - 辅音 */
  --phoneme-2: #10b981;
  /* 绿色 - 元音 */
  --phoneme-3: #f59e0b;
  /* 橙色 */
  --phoneme-4: #8b5cf6;
  /* 紫色 - digraph */
  --phoneme-5: #ef4444;
  /* 红色 - 高亮 */
  --phoneme-6: #06b6d4;
  /* 青色 */

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  /* Animation */
  --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg-main: #0b1120;
  --bg-card: #1e293b;
  --text-main: #f1f5f9;
  --text-muted: #cbd5e1;
  /* Lighter muted text for better readability */
  --border-soft: #334155;
  --accent: #60a5fa;
  --accent-soft: rgba(96, 165, 250, 0.14);
  --surface-subtle: rgba(255, 255, 255, 0.045);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

/* Force high contrast for sentence text in dark mode */
[data-theme="dark"] .sentence-en {
  color: #ffffff !important;
}

/* --- Base Reset --- */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: var(--transition-smooth);
  overflow-x: hidden;
}

h1,
h2,
h3,
.logo {
  font-family: var(--font-display);
}

/* --- Layout --- */
.container {
  max-width: 920px;
  margin: 0 auto;
  padding-top: 0;
  padding-bottom: 0;
  padding-left: calc(2rem + env(safe-area-inset-left));
  padding-right: calc(2rem + env(safe-area-inset-right));
}

.header {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding-top: env(safe-area-inset-top);
}

[data-theme="dark"] .header {
  background: rgba(30, 41, 59, 0.7);
}

.header-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

/* --- Navigation --- */
.nav {
  display: flex;
  gap: 1.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 0.5rem 0.2rem;
  position: relative;
  transition: var(--transition-smooth);
}

.nav-link.active {
  color: var(--accent);
}

@media (hover: hover) {
  .nav-link:hover {
    color: var(--accent);
  }
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: var(--transition-smooth);
}

.nav-link.active::after {
  width: 100%;
}

/* --- Hero Section --- */
.hero {
  padding: 100px 0 60px;
  text-align: center;
}

.hero h1 {
  font-size: clamp(2.2rem, 4vw + 1rem, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

/* --- Cards & Components --- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

@media (hover: hover) {
  .card:hover {
    /* transform: translateY(-8px); REMOVED */
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
  }
}


/* --- Phonics Specific --- */
.word-card {
  text-align: center;
  padding: 2.5rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* --- Practice View --- */
.practice-stage {
  margin-top: 3rem;
  position: relative;
}

.practice-header {
  text-align: center;
  margin-bottom: 3rem;
  cursor: pointer;
}

.practice-pattern {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.15;
  color: var(--text-main);
  max-width: 600px;
  margin: 0 auto;
  word-break: break-word;
}

.practice-pattern.is-concept {
  font-family: var(--font-sans);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
}

.practice-ipa {
  font-size: 1.5rem;
  color: var(--text-muted);
  font-weight: 300;
  margin-top: 0.5rem;
}

.practice-note {
  font-size: 0.85rem;
  color: var(--slate-400);
  margin-top: 0.5rem;
}

.practice-actions {
  display: none;
}

.practice-progress {
  text-align: center;
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
}

.flashcard .word-main {
  font-size: 4rem;
}

.flashcard .word-meaning {
  font-size: 1.5rem;
  margin-bottom: 2rem;
  color: var(--text-muted);
}

.word-main {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.word-highlight {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 6px;
  text-decoration-thickness: 3px;
}

.word-meaning {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 400;
}

/* --- Phoneme Breakdown Colors --- */
/* --- Phoneme Breakdown Colors (Text Only Mode) --- */
.breakdown-display {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.2rem;
  margin: 1rem 0 2rem;
  flex-wrap: wrap;
}

.phoneme {
  display: inline-block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 7vw, 3.5rem);
  /* Larger text since boxes are gone */
  font-weight: 700;
  padding: 0 0.2rem;
  line-height: 1;
  text-align: center;
  color: var(--phoneme-color, var(--text-main));
  background: none !important;
  box-shadow: none !important;
  border: none !important;
  min-width: auto;
  height: auto;
  /* Removed transition/transform */
}

/* Remove hover scale */
.phoneme:hover {
  transform: none !important;
}

/* Vowels - just inherit text color logic, no special shape */
.phoneme-vowel {
  border-radius: 0;
  width: auto;
  height: auto;
  min-width: auto;
  padding: 0 0.2rem;
}

/* Digraph - just inherit text color logic */
.phoneme-digraph {
  min-width: auto;
  height: auto;
  padding: 0 0.2rem;
}

/* Highlight/Focus - maybe just a subtle underline or glow? User hated boxes. */
.phoneme-focus {
  text-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
  /* Glow instead of box */
  /* transform: scale(1.05); REMOVED scale as requested */
  animation: none;
  /* User requested NO motion */
}

/* Separator */
.phoneme-sep {
  color: var(--border-soft);
  font-size: 2rem;
  font-weight: 300;
  margin: 0 0.5rem;
  display: inline-block;
  vertical-align: middle;
}

/* Silent letters - grayed out with better contrast */
.phoneme-silent {
  color: var(--slate-400) !important;
  text-decoration: line-through;
  text-decoration-thickness: 2px;
  opacity: 0.6;
}

[data-theme="dark"] .phoneme-silent {
  color: var(--slate-400) !important;
  opacity: 0.5;
}

.phoneme-silent:hover {
  opacity: 1;
  transform: none;
}

/* 音节分隔显示 */
.syllables-display {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin: 0.5rem 0 1rem;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.3rem;
  letter-spacing: 0.15em;
}

/* --- Buttons --- */
.btn {
  padding: 0.8rem 2rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--accent);
  color: white;
}

@media (hover: hover) {
  .btn-primary:hover {
    background: var(--p-700);
    transform: translateY(-2px);
  }
}

/* --- Pattern Chips & Box --- */
.pattern-box {
  display: none;
  /* JS toggles to flex */
  flex-wrap: wrap;
  gap: 0.8rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 20px;
  margin-bottom: 2rem;
}

.pattern-chip {
  padding: 0.6rem 1.2rem;
  border-radius: 100px;
  background: var(--bg-main);
  border: 1px solid var(--border-soft);
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition-smooth);
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 500;
}

.pattern-chip .p-text {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  font-size: 1rem;
  font-weight: 600;
}

/* 当 pattern 是中文长文本时，调整样式 */
.pattern-chip.concept-chip {
  border-radius: 12px;
  padding: 0.5rem 1rem;
}

.pattern-chip.concept-chip .p-text {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
}

.pattern-chip.concept-chip .p-ipa {
  display: none;
}

@media (hover: hover) {
  .pattern-chip:hover {
    border-color: var(--accent);
    /* transform: translateY(-2px); REMOVED */
    background: var(--bg-card);
  }
}

.pattern-chip.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
}

.pattern-chip .p-ipa {
  font-size: 0.8rem;
  opacity: 0.6;
  color: rgba(255, 255, 255, 0.8) !important;
}

.pattern-chip.active .p-ipa {
  opacity: 0.9;
}

/* --- Flashcard Navigation --- */
.flashcard-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  max-width: 680px;
  margin: 0 auto;
}

.flashcard {
  flex: 0 1 500px;
  width: min(100%, 500px);
  min-height: 430px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 3rem !important;
  border-radius: 32px !important;
  background: var(--bg-card);
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}



.nav-btn {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  border: 1px solid var(--border-soft);
  background: var(--bg-card);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
  flex-shrink: 0;
}

@media (hover: hover) {
  .nav-btn:hover:not(:disabled) {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    /* transform: scale(1.1); REMOVED */
  }
}

.nav-btn:disabled {
  opacity: 0.2;
  cursor: not-allowed;
}

/* --- Sentence Info --- */
.sentence-box {
  width: 100%;
  margin-top: 1rem;
  padding: 1.5rem;
  background: var(--bg-main);
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
}

@media (hover: hover) {
  .sentence-box:hover {
    background: var(--p-50);
    border-color: var(--p-100);
  }

  /* Fix: Dark mode hover state should not be light */
  [data-theme="dark"] .sentence-box:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent);
  }
}

.sentence-en {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 0.4rem;
}

.sentence-cn {
  font-size: 1rem;
  color: var(--text-muted);
}

.play-tag {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --- Responsive Design --- */
/* 
 * Device Breakpoints (2026 Updated):
 * - Tablet Landscape: 1024px - 1280px
 * - Tablet Portrait: 768px - 1024px  
 * - Phone Landscape: 480px - 768px
 * - Phone Portrait: < 480px
 * 
 * 设备断点（2026 更新）：
 * - 平板横屏：1024px - 1280px
 * - 平板竖屏：768px - 1024px
 * - 手机横屏：480px - 768px
 * - 手机竖屏：< 480px
 */

/* === Tablet Landscape (iPad Pro, Android Tablets) === */
@media (min-width: 768px) and (max-width: 1024px) {
  .container {
    padding-left: calc(2.5rem + env(safe-area-inset-left));
    padding-right: calc(2.5rem + env(safe-area-inset-right));
  }
  
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }
  
  .flashcard-wrapper {
    max-width: 650px;
  }
  
  .flashcard {
    min-height: 400px;
    padding: 2.5rem !important;
  }
  
  .flashcard .word-main {
    font-size: 3.5rem;
  }
  
  .pattern-box {
    justify-content: center;
  }
}

/* === Tablet Portrait Mode === */
@media (min-width: 600px) and (max-width: 768px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .flashcard {
    min-height: 380px;
  }
}

/* === Landscape Mode for Phones === */
@media (max-height: 500px) and (orientation: landscape) {
  .hero {
    padding: 30px 0 20px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
    margin-bottom: 0.75rem;
  }
  
  .hero p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }
  
  .practice-header {
    margin-bottom: 1rem;
  }
  
  .practice-pattern {
    font-size: 2rem;
  }
  
  .flashcard {
    min-height: 250px !important;
    padding: 1.25rem 1.5rem !important;
  }
  
  .flashcard .word-main {
    font-size: 2rem !important;
  }
  
  .flashcard .word-meaning {
    font-size: 1rem !important;
    margin-bottom: 0.75rem !important;
  }
  
  .breakdown-display {
    margin: 0.5rem 0 0.75rem;
  }
  
  .phoneme {
    font-size: 1.5rem !important;
  }
  
  .sentence-box {
    padding: 0.75rem;
  }
  
  .practice-actions {
    padding-top: 0.5rem;
    padding-bottom: calc(0.5rem + env(safe-area-inset-bottom));
  }
}

/* === iOS Specific Optimizations === */
@supports (-webkit-touch-callout: none) {
  /* Prevent iOS text selection on interactive elements */
  .pattern-chip,
  .card,
  .btn,
  .nav-btn,
  .sentence-box {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
  }
  
  /* Fix iOS Safari 100vh issue */
  .flashcard {
    min-height: 50svh;
  }
  
  /* Smooth momentum scrolling */
  .pattern-box {
    -webkit-overflow-scrolling: touch;
  }
  
  /* Fix iOS Safari input zoom */
  input, select, textarea {
    font-size: 16px !important;
  }
}

/* === Android Specific Optimizations === */
@media (hover: none) and (pointer: coarse) {
  /* Larger touch targets for Android (48px minimum) */
  .pattern-chip {
    min-height: 48px;
    min-width: 48px;
  }
  
  .nav-link {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
  }
  
  .btn {
    min-height: 48px;
  }
  
  .btn-theme {
    min-height: 48px;
    min-width: 48px;
  }
  
  /* Remove hover effects on touch devices */
  .card:hover {
    transform: none;
  }
  
  /* Add active states instead */
  .card:active {
    transform: scale(0.98);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
  }
  
  .pattern-chip:active {
    transform: scale(0.95);
    background: var(--p-100);
  }
}

/* === High DPI Displays (Retina, etc.) === */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .phoneme {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* === Dark Mode System Preference Auto-Switch === */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-main: #0b1120;
    --bg-card: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #cbd5e1;
    --border-soft: #334155;
    --accent: #60a5fa;
  }
}

/* === Reduced Motion Accessibility === */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .flashcard {
    transition: none;
  }
}

/* === Small Phone Optimizations (iPhone SE, etc.) === */
@media (max-width: 375px) {
  .container {
    padding-left: calc(1rem + env(safe-area-inset-left));
    padding-right: calc(1rem + env(safe-area-inset-right));
  }
  
  .logo {
    font-size: 1.1rem;
  }
  
  .nav {
    gap: 0.5rem;
  }
  
  .nav-link {
    font-size: 0.85rem;
  }
  
  .flashcard {
    padding: 1.25rem 1rem !important;
  }
  
  .flashcard .word-main {
    font-size: 2rem !important;
  }
  
  .phoneme {
    font-size: 1.5rem !important;
  }
  
  .pattern-chip {
    padding: 0.4rem 0.7rem;
    font-size: 0.9rem;
  }
}

/* --- Legacy Responsive (Original) --- */
@media (max-width: 768px) {
  .header-inner {
    height: 60px;
  }

  .hero {
    padding: 60px 0 40px;
  }

  .hero h1 {
    font-size: clamp(2rem, 4vw + 1rem, 2.2rem);
  }

  .container {
    padding-top: 0;
    padding-bottom: 0;
    padding-left: calc(1.25rem + env(safe-area-inset-left));
    padding-right: calc(1.25rem + env(safe-area-inset-right));
  }

  /* 移动端卡片全宽，减少间距 */
  .flashcard-wrapper {
    gap: 0.5rem;
    position: relative;
  }

  /* 手机端隐藏左右按钮，主要靠滑动 */
  .nav-btn {
    display: none;
  }

  /* 允许纵向滚动，横向手势交给 JS 处理 */
  #current-flashcard {
    touch-action: pan-y;
  }


  .flashcard {
    flex: 1;
    width: 100%;
    padding: 2.5rem 1.5rem !important;
    min-height: 50vh;
    border-radius: 24px !important;
    box-shadow: var(--shadow-md);
  }

  @supports (height: 1dvh) {
    .flashcard {
      min-height: 50dvh;
    }
  }

  .flashcard .word-main {
    font-size: clamp(2.2rem, 9vw, 3rem) !important;
  }

  .practice-header {
    margin-bottom: 2rem;
  }

  .practice-pattern {
    font-size: clamp(2.2rem, 9vw, 3rem);
  }

  #pattern-section {
    margin-top: 1.5rem !important;
  }

  .pattern-box {
    padding: 1rem;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
  }

  .mobile-hint {
    display: block !important;
  }

  .category-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .card {
    padding: 1.5rem;
  }

}

@media (max-width: 480px) {
  .header-inner {
    height: 56px;
  }

  .logo {
    font-size: 1.25rem;
  }

  .nav {
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  .nav-link,
  .btn-theme {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding-top: 0.3rem;
    padding-bottom: 0.3rem;
  }

  .hero {
    padding: 44px 0 28px;
  }

  .hero p {
    font-size: 1.05rem;
  }

  .practice-stage {
    margin-top: 1.75rem;
    padding-bottom: calc(88px + env(safe-area-inset-bottom));
  }

  .practice-header {
    margin-bottom: 1.5rem;
  }

  .practice-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.6rem;

    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;

    padding-top: 0.75rem;
    padding-left: calc(1.25rem + env(safe-area-inset-left));
    padding-right: calc(1.25rem + env(safe-area-inset-right));
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom));

    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--border-soft);
    z-index: 1100;
  }

  [data-theme="dark"] .practice-actions {
    background: rgba(16, 21, 29, 0.7);
  }

  .practice-actions .nav-action {
    width: 100%;
    justify-content: center;
  }

  .practice-actions .btn-primary {
    grid-column: 1 / -1;
  }

  .flashcard {
    padding: 1.75rem 1.25rem !important;
    border-radius: 20px !important;
  }

  .breakdown-display {
    margin: 0.75rem 0 1.25rem;
  }

  .phoneme-sep {
    margin: 0 0.25rem;
  }

  .word-meaning {
    font-size: 1.15rem !important;
    margin-bottom: 1.25rem !important;
  }

  .sentence-box {
    padding: 1.1rem;
  }

  .sentence-en {
    font-size: 1.05rem;
  }

  .sentence-cn {
    font-size: 0.95rem;
  }

  /* 手机端 pattern 列表改为横向滚动，避免撑太高 */
  .pattern-box {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .pattern-chip {
    flex: 0 0 auto;
    min-height: 44px;
    padding: 0.55rem 0.9rem;
  }

  .btn {
    min-height: 44px;
  }
}

.seo-link-corner {
  position: fixed;
  bottom: 10px;
  right: 10px;
  font-size: 0.7rem;
  color: var(--text-muted);
  opacity: 0.75;
  text-decoration: none;
  z-index: 9999;
}

.auto-pronounce-toggle {
  display: flex;
  width: fit-content;
  align-items: center;
  gap: 0.5rem;
  margin: 1rem auto 0;
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
}

.auto-pronounce-toggle input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent);
}

/* --- Learning page refresh --- */
.learning-page {
  padding-top: 2rem;
  padding-bottom: 4rem;
}

.learning-hero {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  padding: 2.25rem 2.4rem;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--border-soft));
  border-radius: 26px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 11%, var(--bg-card)), var(--bg-card) 60%);
}

.learning-kicker {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--accent);
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.learning-hero h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  letter-spacing: -0.035em;
}

.learning-hero p {
  max-width: 540px;
  margin: 0.6rem 0 0;
  color: var(--text-muted);
}

.learning-hero-meta {
  display: grid;
  gap: 0.2rem;
  flex: 0 0 auto;
  padding: 0.9rem 1rem;
  border-radius: 16px;
  background: var(--bg-main);
  color: var(--text-muted);
  font-size: 0.8rem;
}

.learning-hero-meta strong {
  color: var(--text-main);
  font-size: 0.95rem;
}

.learning-step-section {
  margin-top: 2.5rem;
}

.learning-section-heading {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
  margin-bottom: 1rem;
}

.learning-section-heading > span {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 800;
}

.learning-section-heading h3 {
  margin: 0;
  font-size: 1.1rem;
}

.learning-section-heading p {
  margin: 0.15rem 0 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.learning-page .category-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 0;
}

.learning-category {
  display: flex;
  align-items: center;
  width: 100%;
  min-height: 96px;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border-soft);
  border-radius: 18px;
  background: var(--bg-card);
  color: var(--text-main);
  cursor: pointer;
  text-align: left;
  transition: var(--transition-smooth);
}

.learning-category:hover,
.learning-category:focus-visible {
  border-color: var(--accent);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.1);
}

.learning-category-number {
  width: 2rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
}

.learning-category-content {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
  flex: 1;
}

.learning-category-content strong {
  font-size: 1rem;
}

.learning-category-content small {
  overflow: hidden;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.learning-category-arrow {
  color: var(--text-muted);
  font-size: 1.25rem;
  transition: transform var(--transition-smooth);
}

.learning-category:hover .learning-category-arrow,
.learning-category.is-selected .learning-category-arrow {
  color: var(--accent);
  transform: translateX(3px);
}

.learning-workspace {
  margin-top: 2.25rem;
  padding: 1.5rem;
  border: 1px solid var(--border-soft);
  border-radius: 24px;
  background: color-mix(in srgb, var(--bg-card) 92%, var(--accent));
}

.learning-workspace .pattern-box {
  margin-bottom: 0;
  padding: 0.65rem;
  border-radius: 16px;
  background: var(--bg-main);
}

.learning-workspace .practice-stage {
  margin-top: 2rem;
}

.learning-workspace .practice-header {
  margin-bottom: 1.5rem;
  padding: 1rem;
  border-radius: 18px;
  background: var(--bg-main);
}

.learning-workspace .practice-eyebrow {
  margin-bottom: 0.15rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.learning-workspace .practice-pattern {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
}

.learning-workspace .practice-ipa {
  font-size: 1.15rem;
}

.memory-guide {
  max-width: 620px;
  margin: 0 auto 1.25rem;
  padding: 1rem 1.1rem;
  border: 1px solid color-mix(in srgb, #f59e0b 30%, var(--border-soft));
  border-radius: 18px;
  background: color-mix(in srgb, #fef3c7 45%, var(--bg-card));
  color: var(--text-main);
}

[data-theme="dark"] .memory-guide {
  background: color-mix(in srgb, #78350f 24%, var(--bg-card));
}

.memory-guide-heading {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 0.75rem;
}

.memory-guide-heading strong { font-size: 0.95rem; }

.memory-guide-heading > span:last-child {
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.memory-guide-compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.memory-guide-compare > div {
  padding: 0.65rem 0.7rem;
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg-card) 82%, transparent);
}

.memory-guide-compare .is-current {
  outline: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
}

.memory-guide small {
  color: var(--text-muted);
  font-size: 0.72rem;
}

.memory-guide p {
  margin: 0.18rem 0 0;
  font-size: 0.85rem;
  line-height: 1.55;
}

.memory-guide-pairs {
  padding-top: 0.7rem;
  color: var(--accent);
  font-weight: 700;
  text-align: center;
}

.memory-guide-tip { color: var(--text-muted); }

.learning-page .category-grid.is-condensed {
  grid-template-columns: minmax(0, 1fr);
  max-width: 460px;
}

.learning-page .category-selection-summary {
  width: fit-content;
  padding: 0.5rem 0.7rem 0.5rem 0.85rem;
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  background: var(--bg-card);
}

@media (max-width: 700px) {
  .learning-page {
    padding-top: 1rem;
  }

  .learning-hero {
    align-items: flex-start;
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    border-radius: 22px;
  }

  .learning-hero-meta {
    width: 100%;
  }

  .learning-page .category-grid {
    grid-template-columns: 1fr;
  }

  .learning-workspace {
    margin-left: -0.15rem;
    margin-right: -0.15rem;
    padding: 1rem;
    border-radius: 20px;
  }

  .learning-workspace .practice-header {
    margin-bottom: 1rem;
  }

  .memory-guide-compare { grid-template-columns: 1fr; }
}

@media (hover: hover) {
  .seo-link-corner:hover {
    opacity: 1;
    color: var(--accent);
  }
}

/* --- Utils --- */
.glass {
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ========================================= */
/* MERGED UPDATES (Dark Mode Improvements)   */
/* ========================================= */

/* Dark mode text contrast improvements for English sentences */
@media (prefers-color-scheme: dark) {

  /* General English text - improve contrast */
  body.dark-mode {
    --text-color-primary: #ffffff;
    --text-color-secondary: #e0e0e0;
    --english-text-color: #ffffff;
    --highlight-bg-dark: #1a3a1a;
    --highlight-text-dark: #90ee90;
  }

  /* English sentence text with enhanced contrast */
  .english-sentence,
  .english-text,
  [lang="en"] {
    color: var(--english-text-color, #ffffff);
    font-weight: 500;
  }

  /* Highlighted English text in dark mode */
  .english-sentence mark,
  .english-text mark,
  [lang="en"] mark,
  mark {
    background-color: var(--highlight-bg-dark, #1a3a1a);
    color: var(--highlight-text-dark, #90ee90);
    font-weight: 600;
    padding: 4px 6px;
    border-radius: 4px;
  }

  /* Enhanced contrast for nested English elements */
  .english-sentence strong,
  .english-text strong,
  [lang="en"] strong {
    color: #ffffff;
    font-weight: 700;
  }

  /* English text in containers */
  .dark-mode .english-sentence,
  .dark-mode .english-text,
  .dark-mode [lang="en"] {
    color: var(--english-text-color, #ffffff);
  }
}

/* Light mode (fallback) */
@media (prefers-color-scheme: light) {
  body {
    --text-color-primary: #000000;
    --text-color-secondary: #333333;
    --english-text-color: #1a1a1a;
    --highlight-bg-light: #fff3cd;
    --highlight-text-light: #664d00;
  }

  .english-sentence,
  .english-text,
  [lang="en"] {
    color: var(--english-text-color, #1a1a1a);
  }

  .english-sentence mark,
  .english-text mark,
  [lang="en"] mark,
  mark {
    background-color: var(--highlight-bg-light, #fff3cd);
    color: var(--highlight-text-light, #664d00);
    padding: 4px 6px;
    border-radius: 4px;
  }
}

/* Mobile header notch adaptation - Improved safe area support */
header,
.header {
  padding-top: calc(1rem + env(safe-area-inset-top));
  padding-left: calc(1rem + env(safe-area-inset-left));
  padding-right: calc(1rem + env(safe-area-inset-right));
}

@media (max-width: 768px) {

  header,
  .header {
    padding-top: calc(0.75rem + env(safe-area-inset-top));
  }
}

@media (max-width: 480px) {

  header,
  .header {
    padding-top: calc(0.5rem + env(safe-area-inset-top));
  }
}

/* Sentence Click/Active State Visibility Fix */
.sentence-box:active,
.sentence-box.active {
  background: var(--p-100);
  /* Lighter background on click */
  border-color: var(--p-600);
}

/* Ensure text remains visible when sentence box is active/clicked */
.sentence-box:active .sentence-en,
.sentence-box.active .sentence-en {
  color: var(--p-700);
  /* Darker blue for contrast */
  font-weight: 600;
}

[data-theme="dark"] .sentence-box:active,
[data-theme="dark"] .sentence-box.active {
  background: var(--slate-800);
  border-color: var(--accent);
}

[data-theme="dark"] .sentence-box:active .sentence-en,
[data-theme="dark"] .sentence-box.active .sentence-en {
  color: var(--accent);
  /* Bright accent color for visibility in dark mode */
}

/* Accessibility improvements */
@media (prefers-contrast: more) {
  @media (prefers-color-scheme: dark) {

    .english-sentence,
    .english-text,
    [lang="en"] {
      color: #ffffff !important;
      text-shadow: 0 0 2px rgba(0, 0, 0, 0.5);
    }

    .english-sentence mark,
    .english-text mark,
    [lang="en"] mark {
      background-color: #0d2d0d;
      color: #ffff00;
      font-weight: 700;
    }
  }
}

/* Print styles */
@media print {

  .english-sentence,
  .english-text,
  [lang="en"] {
    color: #000000;
  }
}

/* 旧的 .quiz-* 样式已随考核功能重写移除，新样式见 css/assessment.css */

/* Learning-card polish and pronunciation feedback */
.practice-eyebrow,
.word-card-label,
.sentence-heading {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.07em;
}

.practice-eyebrow {
  margin-bottom: 0.5rem;
  color: var(--accent);
}

.word-card-label {
  margin-bottom: 0.8rem;
  color: var(--accent);
}

.flashcard {
  border-color: color-mix(in srgb, var(--accent) 18%, var(--border-soft));
}

.word-play-btn {
  min-height: 46px;
  margin-top: 1.15rem;
  padding: 0.62rem 1.1rem;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  box-shadow: 0 8px 18px rgba(37, 99, 235, 0.18);
  font: inherit;
  font-size: 0.94rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.word-play-btn:hover,
.word-play-btn.is-playing {
  transform: translateY(-1px);
  filter: brightness(1.05);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.3);
}

.sentence-box {
  background: var(--surface-subtle);
}

.sentence-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.45rem;
  color: var(--accent);
}

.audio-status {
  min-height: 1.5rem;
  margin-top: 0.35rem;
  color: var(--text-muted);
  font-size: 0.82rem;
  text-align: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.audio-status.is-visible {
  opacity: 1;
}

.category-card.is-selected {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.12);
}

.category-grid.is-condensed {
  grid-template-columns: minmax(280px, 420px);
  margin-top: 0.75rem;
}

.category-grid.is-condensed .category-card:not(.is-selected) {
  display: none;
}

.category-selection-summary {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin: 1rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.category-selection-summary strong {
  color: var(--text-main);
}

.category-selection-summary button {
  margin-left: 0.15rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  background: var(--bg-card);
  color: var(--accent);
  font: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
}

.pattern-chip .p-ipa {
  color: var(--text-muted) !important;
}

.pattern-chip.active .p-ipa {
  color: rgba(255, 255, 255, 0.85) !important;
}

.card:focus-visible,
.pattern-chip:focus-visible,
.nav-btn:focus-visible,
.btn:focus-visible,
.btn-theme:focus-visible,
.word-play-btn:focus-visible,
.sentence-box:focus-visible {
  outline: 3px solid rgba(59, 130, 246, 0.35);
  outline-offset: 3px;
}

@media (max-width: 560px) {
  .header-inner {
    height: auto;
    min-height: 64px;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 0.1rem;
    padding-top: 0.55rem;
  }

  .logo {
    width: 100%;
    flex: 0 0 100%;
    font-size: 1.3rem;
  }

  .nav {
    width: 100%;
    flex: 0 0 100%;
    justify-content: space-between;
    gap: 0;
    flex-wrap: nowrap;
    padding: 0.1rem 0 0.4rem;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .nav::-webkit-scrollbar {
    display: none;
  }

  .nav-link {
    flex: 0 0 auto;
    padding: 0.4rem 0.32rem;
    font-size: 0.8rem;
    white-space: nowrap;
  }

  .btn-theme {
    flex: 0 0 auto;
    margin-left: 0 !important;
    padding: 0.4rem 0.18rem;
    white-space: nowrap;
  }

  .practice-actions {
    display: none;
  }

  .practice-stage {
    padding-bottom: env(safe-area-inset-bottom);
  }

  .category-grid.is-condensed {
    grid-template-columns: 1fr;
  }

  .category-selection-summary {
    flex-wrap: wrap;
  }

  .word-play-btn {
    width: 100%;
  }

  .practice-eyebrow,
  .word-card-label {
    font-size: 0.72rem;
  }
}

/* ==========================================================================
   学习页操作性优化
   问题：规则字母格在 y≈700，练习卡在 y≈1100，而视口只有 ~900 高。
   选一个字母要往下滚一屏用卡片，选下一个又得滚回去，来回折腾。
   做法：宽屏改左右双栏（规则栏吸顶），窄屏保留上下但替用户滚一次。
   ========================================================================== */

/* 显隐改由 class 驱动，内联 display 会盖掉下面的 grid */
.learning-workspace {
  display: none;
}

.learning-workspace.is-active {
  display: block;
}

/* 选完模块后压缩页首，把首屏留给练习区 */
.learning-page.has-selection .learning-hero {
  padding: 1.1rem 1.6rem;
  align-items: center;
}

.learning-page.has-selection .learning-hero h2 {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}

.learning-page.has-selection .learning-hero p {
  display: none;
}

.learning-page.has-selection .learning-step-section {
  margin-top: 1.25rem;
}

.learning-page.has-selection .learning-workspace {
  margin-top: 1.25rem;
}

@media (min-width: 960px) {
  /* 左栏规则、右栏练习卡：点字母不用再上下跑 */
  .learning-workspace.is-active {
    display: grid;
    grid-template-columns: minmax(210px, 250px) minmax(0, 1fr);
    column-gap: 1.75rem;
    align-items: start;
  }

  .learning-workspace > .learning-section-heading {
    grid-column: 1 / -1;
  }

  /* 规则栏吸顶：滚到卡片后，字母始终留在视野里 */
  .learning-workspace > .pattern-box {
    position: sticky;
    top: 5.5rem;
    max-height: calc(100vh - 8rem);
    overflow-y: auto;
    gap: 0.5rem;
    padding: 0.9rem;
    align-content: flex-start;
  }

  .learning-workspace > .pattern-box .pattern-chip {
    padding: 0.45rem 0.85rem;
  }

  .learning-workspace > #practice-container {
    min-width: 0;
  }

  .learning-workspace .practice-stage {
    margin-top: 0;
  }

  /* 双栏腾出的横向空间给卡片，不再被五层嵌套挤成 482px */
  .learning-workspace .flashcard-wrapper {
    max-width: none;
  }

  .learning-workspace .flashcard {
    max-width: 100%;
  }

  /* 规则大字号那一栏在双栏里没必要再占满高 */
  .learning-workspace .practice-header {
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
  }

  .learning-workspace .practice-pattern {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
  }
}

/* 窄屏：翻词按钮要好按一点 */
@media (max-width: 768px) {
  .nav-btn {
    width: 52px;
    height: 52px;
  }
}

/* --- 卡片瘦身：642px 一屏放不下，例句总被截掉 --- */
@media (min-width: 960px) {
  /* 翻页按钮改为浮在卡片两侧，把整栏宽度让给卡片（原来横向被吃掉 128px） */
  .learning-workspace .flashcard-wrapper {
    position: relative;
    display: block;
    max-width: none;
  }

  .learning-workspace .flashcard {
    flex: none;
    width: 100%;
    max-width: none;
    min-height: 0;
    padding: 1.6rem 1.9rem !important;
  }

  .learning-workspace .nav-btn {
    position: absolute;
    top: 50%;
    z-index: 2;
    width: 42px;
    height: 42px;
    transform: translateY(-50%);
    background: color-mix(in srgb, var(--bg-card) 88%, transparent);
    box-shadow: var(--shadow-md);
  }

  .learning-workspace .nav-btn.prev {
    left: 0.55rem;
  }

  .learning-workspace .nav-btn.next {
    right: 0.55rem;
  }
}

/* 卡片内容压紧——各处都受益，不只是宽屏 */
.learning-workspace .flashcard {
  min-height: 0;
  padding: 1.75rem !important;
}

.learning-workspace .word-card-label {
  margin-bottom: 0.15rem;
}

.learning-workspace .flashcard .word-main {
  font-size: clamp(2.4rem, 5vw, 3rem);
  margin-bottom: 0.15rem;
}

.learning-workspace .breakdown-display {
  margin: 0.35rem 0 0.15rem;
}

.learning-workspace .flashcard .word-meaning {
  font-size: 1.15rem;
  margin-bottom: 0.85rem;
}

.learning-workspace .sentence-box {
  margin-top: 0.8rem;
  padding: 0.95rem 1.1rem;
}

.learning-workspace .sentence-box .play-tag {
  display: none;   /* 「点击阅读例句」——整块本来就可点，标题栏也有喇叭图标 */
}

/* --- 窄屏：规则格改成吸顶横条 ---
   单栏布局下规则格在卡片上方，选完一个字母要滚下去看卡片、
   选下一个又要滚上来。做成吸顶横向滚动条后，字母始终够得着。 */
@media (max-width: 959px) {
  .learning-workspace > .pattern-box {
    position: sticky;
    top: 72px;                       /* 站点 header 高度 */
    z-index: 20;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 0.5rem;
    padding: 0.6rem 0.75rem;
    margin: 0 -0.75rem 0.75rem;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
    background: color-mix(in srgb, var(--bg-card) 94%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    scrollbar-width: thin;
  }

  .learning-workspace > .pattern-box .pattern-chip {
    flex: 0 0 auto;                  /* 不压缩，横向排开 */
  }

  /* 吸顶后大字号规则栏就多余了，压扁让位给卡片 */
  .learning-workspace .practice-header {
    margin-bottom: 0.75rem;
    padding: 0.5rem;
  }

  .learning-workspace .practice-pattern {
    font-size: clamp(1.6rem, 7vw, 2.2rem);
  }

  .learning-workspace .practice-ipa {
    font-size: 1rem;
  }
}

/* --- 易混对比模块下移 ---
   .memory-guide 有 280px 高，原本夹在规则栏和卡片中间，
   直接把卡片顶出首屏。它是补充材料，卡片才是主操作对象，所以放到卡片后面。 */
.learning-workspace .practice-stage {
  display: flex;
  flex-direction: column;
}

.learning-workspace .practice-stage > .memory-guide {
  order: 3;
  margin-top: 1rem;
}

.learning-workspace .practice-stage > .practice-header {
  order: 1;
}

.learning-workspace .practice-stage > .flashcard-wrapper {
  order: 2;
}

.learning-workspace .practice-stage > .auto-pronounce-toggle {
  order: 4;
}

.learning-workspace .practice-stage > .practice-progress {
  order: 5;
}

.learning-workspace .practice-stage > .audio-status {
  order: 6;
}

.learning-workspace .practice-stage > .mobile-hint {
  order: 7;
}

/* ==========================================================================
   学习页宽屏调优
   1) 容器在大屏放宽（连同页首导航一起，避免内容比导航宽而错位）
   2) 规则栏加宽——250px 一行只放得下 3 个字母，太挤
   3) 卡片继续瘦身
   ========================================================================== */

/* 只放宽主应用页（学习 / 考核）。summary.html 和 downloads.html 有自己的
   内容容器（1000 / 900），全局放宽会让导航条比内容还宽，反而错位。 */
@media (min-width: 1180px) {
  .is-app-wide .container {
    max-width: 1120px;
  }
}

@media (min-width: 1440px) {
  .is-app-wide .container {
    max-width: 1240px;
  }
}

@media (min-width: 960px) {
  /* 规则栏 250 → 340，一行能排 5 个字母 */
  .learning-workspace.is-active {
    grid-template-columns: minmax(300px, 340px) minmax(0, 1fr);
    column-gap: 2rem;
  }

  /* 卡片不跟着容器无限变宽——太宽的单词卡反而难读 */
  .learning-workspace .flashcard {
    width: 100%;
    max-width: 640px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem !important;
  }

  /* 宽屏上这句提示是多余的，卡片本身就可点 */
  .learning-workspace .word-card-label {
    display: none;
  }
}

/* --- 卡片再瘦一圈 --- */
.learning-workspace .flashcard {
  padding: 1.25rem 1.4rem !important;
}

.learning-workspace .flashcard .word-main {
  font-size: clamp(2.1rem, 4vw, 2.5rem);
  margin-bottom: 0;
}

.learning-workspace .breakdown-display {
  margin: 0.2rem 0 0;
  transform: scale(0.92);
}

.learning-workspace .flashcard .word-meaning {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.learning-workspace .word-play-btn {
  margin-top: 0.55rem;
  padding: 0.5rem 1.1rem;
}

.learning-workspace .sentence-box {
  margin-top: 0.6rem;
  padding: 0.75rem 0.95rem;
}

.learning-workspace .sentence-box .sentence-heading {
  margin-bottom: 0.2rem;
}

/* .practice-stage 改成 flex 列之后，.flashcard-wrapper 自带的 margin:0 auto
   会抑制拉伸，让它收缩成内容宽度（实测只剩 239px）。这里把宽度要回来。 */
.learning-workspace .flashcard-wrapper {
  width: 100%;
  max-width: none;
  margin-left: 0;
  margin-right: 0;
  align-self: stretch;
}

/* --- 逐音音标（可在练习区开关） --- */
.ipa-display {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.2rem;
  margin: 0.15rem 0 0.35rem;
  font-family: "Segoe UI", "Charis SIL", "Doulos SIL", system-ui, sans-serif;
  font-size: 0.95rem;
  color: var(--text-muted);
  letter-spacing: 0.01em;
}

.ipa-token::before { content: "/"; opacity: 0.45; }
.ipa-token::after  { content: "/"; opacity: 0.45; }

/* 查不到读音时留个占位点，不硬标一个可能是错的音 */
.ipa-token.is-unknown {
  opacity: 0.35;
}

.ipa-token.is-unknown::before,
.ipa-token.is-unknown::after { content: ""; }

.ipa-sep {
  opacity: 0.3;
  font-size: 0.75rem;
}

.practice-toggles {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}