/* ============================================================
   PinyinDic (拼字集) — Complete CSS Design System
   ============================================================ */

/* --- CSS Custom Properties (Light Mode Default) --- */
:root {
  color-scheme: light;

  /* Brand colors */
  --color-primary: #FF9A56;
  --color-primary-dark: #D4845C;
  --color-primary-light: #FFB88C;
  --color-accent: #50E3C2;
  --color-accent-dark: #3BBFA3;
  --color-accent-light: #7AECD5;

  /* Surfaces */
  --color-bg: #F8F6F3;
  --color-bg-alt: #FFFFFF;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F0EDE9;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-surface-glass-border: rgba(255, 255, 255, 0.45);

  /* Text */
  --color-text: #1A1A2E;
  --color-text-secondary: #5A5A72;
  --color-text-tertiary: #8E8EA0;
  --color-text-inverse: #FFFFFF;

  /* Borders & Shadows */
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-strong: rgba(0, 0, 0, 0.15);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.10);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-glow-primary: 0 4px 24px rgba(255, 154, 86, 0.25);
  --shadow-glow-accent: 0 4px 24px rgba(80, 227, 194, 0.25);

  /* Nav */
  --nav-height: 64px;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --nav-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
  --nav-shadow-scroll: 0 4px 20px rgba(0, 0, 0, 0.08);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Container */
  --container-max: 1200px;
  --container-padding: 20px;

  /* Gradient */
  --gradient-hero: linear-gradient(135deg, #FFF5ED 0%, #FFECD2 50%, #E8FDF5 100%);
  --gradient-char-bg: linear-gradient(135deg, #FFF0E6 0%, #FFDFC4 100%);
  --gradient-primary: linear-gradient(135deg, #FF9A56 0%, #FFB88C 100%);
  --gradient-accent: linear-gradient(135deg, #50E3C2 0%, #7AECD5 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 154, 86, 0.06) 0%, rgba(80, 227, 194, 0.06) 100%);
}

/* --- Dark Mode --- */
[data-theme="dark"] {
  color-scheme: dark;

  --color-bg: #0F0F1A;
  --color-bg-alt: #161625;
  --color-surface: #1C1C30;
  --color-surface-alt: #232340;
  --color-surface-glass: rgba(28, 28, 48, 0.78);
  --color-surface-glass-border: rgba(255, 255, 255, 0.08);

  --color-text: #E8E8F0;
  --color-text-secondary: #A0A0B8;
  --color-text-tertiary: #6E6E88;

  --color-border: rgba(255, 255, 255, 0.06);
  --color-border-strong: rgba(255, 255, 255, 0.12);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow-primary: 0 4px 24px rgba(255, 154, 86, 0.15);
  --shadow-glow-accent: 0 4px 24px rgba(80, 227, 194, 0.15);

  --nav-bg: rgba(15, 15, 26, 0.88);
  --nav-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
  --nav-shadow-scroll: 0 4px 20px rgba(0, 0, 0, 0.4);

  --gradient-hero: linear-gradient(135deg, #1A1420 0%, #1C1528 50%, #0F1A1A 100%);
  --gradient-char-bg: linear-gradient(135deg, #2A1E14 0%, #2E2218 100%);
  --gradient-card: linear-gradient(135deg, rgba(255, 154, 86, 0.04) 0%, rgba(80, 227, 194, 0.04) 100%);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Nunito', 'Noto Serif SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
  touch-action: manipulation;
  -webkit-tap-highlight-color: rgba(255, 154, 86, 0.18);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Chinese text uses serif */
h1, h2, h3, h4, h5, h6,
.cn-text,
.char-display,
.char-pinyin {
  font-family: 'Noto Serif SC', 'PingFang SC', 'SimSun', serif;
  scroll-margin-top: calc(var(--nav-height) + 16px);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  color: inherit;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid rgba(255, 154, 86, 0.55);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 2000;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  background: var(--color-text);
  color: var(--color-text-inverse);
  transform: translateY(-160%);
  transition: transform var(--transition-fast);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* --- Utility --- */
.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.section-title .icon {
  font-size: 1.25em;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 1px;
  margin-left: var(--space-md);
  opacity: 0.3;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: var(--nav-bg);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--nav-shadow);
  transition: box-shadow var(--transition-base), background var(--transition-slow);
}

.site-nav.scrolled {
  box-shadow: var(--nav-shadow-scroll);
}

.nav-inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-lg);
}

.nav-logo {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-text);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
  transition: color var(--transition-fast);
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-logo .logo-img {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  object-fit: contain;
  flex-shrink: 0;
}

/* Nav Search */
.nav-search {
  flex: 1;
  max-width: 400px;
  position: relative;
}

.nav-search-input {
  width: 100%;
  padding: 8px 16px 8px 40px;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  color: var(--color-text);
  outline: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  font-family: 'Noto Serif SC', serif;
}

.nav-search-input::placeholder {
  color: var(--color-text-tertiary);
}

.nav-search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(255, 154, 86, 0.15);
  background: var(--color-surface);
}

.nav-search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-tertiary);
  pointer-events: none;
  font-size: 0.9rem;
}

/* Nav Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-links a {
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.nav-links a:hover {
  color: var(--color-primary);
  background: rgba(255, 154, 86, 0.08);
}

/* Dark Mode Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background: var(--color-surface-alt);
  color: var(--color-primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  flex-shrink: 0;
}

.menu-toggle:hover {
  background: var(--color-surface-alt);
}

/* Mobile Nav */
@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-lg);
    gap: var(--space-xs);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    width: 100%;
    text-align: center;
  }

  .nav-search {
    max-width: 200px;
  }
}

@media (max-width: 480px) {
  .nav-search {
    display: none;
  }
}

/* ============================================================
   BREADCRUMBS
   ============================================================ */
.breadcrumbs {
  padding: var(--space-md) 0;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: var(--color-text-tertiary);
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.breadcrumbs li + li::before {
  content: '›';
  color: var(--color-text-tertiary);
  margin-right: var(--space-xs);
}

.breadcrumbs a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.breadcrumbs a:hover {
  color: var(--color-primary);
}

.breadcrumbs .current {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   HOME PAGE — HERO
   ============================================================ */
.hero {
  background: var(--gradient-hero);
  padding: var(--space-3xl) 0 var(--space-xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 154, 86, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(circle, rgba(80, 227, 194, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  margin-bottom: var(--space-md);
  line-height: 1.2;
  position: relative;
}

.hero-title .brand-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  position: relative;
}

/* Hero Search */
.hero-search {
  max-width: 520px;
  margin: 0 auto;
  position: relative;
}

.hero-search-input {
  width: 100%;
  padding: 16px 60px 16px 24px;
  font-size: 1.1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  background: var(--color-surface);
  color: var(--color-text);
  outline: none;
  box-shadow: var(--shadow-lg);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  font-family: 'Noto Serif SC', serif;
}

.hero-search-input::placeholder {
  color: var(--color-text-tertiary);
}

.hero-search-input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(255, 154, 86, 0.12);
}

.hero-search-btn {
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-glow-primary);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.hero-search-btn:hover {
  transform: translateY(-50%) scale(1.05);
  box-shadow: 0 6px 28px rgba(255, 154, 86, 0.35);
}

.screenshot-pager {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid rgba(255, 154, 86, 0.16);
  background: rgba(255, 255, 255, 0.34);
  box-shadow: 0 18px 48px rgba(96, 56, 24, 0.12);
}

.screenshot-pager-viewport {
  height: 100%;
  overflow: hidden;
}

.screenshot-pager-track {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  height: 100%;
  padding: 16px 24px 40px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-padding: 0 24px;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
}

.screenshot-pager-track::-webkit-scrollbar {
  display: none;
}

.screenshot-slide {
  flex: 0 0 304px;
  min-width: 0;
  height: 100%;
  margin: 0;
  overflow: hidden;
  border-radius: 22px;
  background: #FFF4E9;
  scroll-snap-align: center;
  box-shadow: 0 16px 34px rgba(82, 47, 19, 0.16);
  opacity: 0.82;
  transition: opacity var(--transition-base), box-shadow var(--transition-base);
}

.screenshot-slide.is-active {
  opacity: 1;
  box-shadow: 0 20px 46px rgba(82, 47, 19, 0.22);
}

.screenshot-slide img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

.screenshot-pager-btn {
  position: absolute;
  top: 50%;
  z-index: 2;
  width: 36px;
  height: 36px;
  transform: translateY(-50%);
  border-radius: var(--radius-full);
  background: rgba(17, 17, 26, 0.72);
  color: white;
  font-size: 1.6rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.screenshot-pager-btn:hover {
  background: rgba(17, 17, 26, 0.9);
  transform: translateY(-50%) scale(1.04);
}

.screenshot-pager-prev {
  left: var(--space-lg);
}

.screenshot-pager-next {
  right: var(--space-lg);
}

.screenshot-pager-dots {
  position: absolute;
  left: 50%;
  bottom: 14px;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 7px;
  transform: translateX(-50%);
}

.screenshot-pager-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: rgba(17, 17, 26, 0.28);
  transition: width var(--transition-fast), background-color var(--transition-fast), transform var(--transition-fast);
}

.screenshot-pager-dot.is-active {
  width: 24px;
  background: var(--color-primary);
}

/* Stats */
.stats-bar {
  display: flex;
  justify-content: center;
  gap: var(--space-2xl);
  padding: var(--space-2xl) 0;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 2rem;
  font-weight: 800;
  font-family: 'Nunito', sans-serif;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-top: var(--space-xs);
}

/* Category Cards */
.category-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-lg);
  padding: var(--space-xl) 0 var(--space-3xl);
}

.category-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  position: relative;
  overflow: hidden;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
  color: var(--color-text);
}

.category-card:hover::before {
  opacity: 1;
}

.category-card-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto var(--space-md);
  position: relative;
}

.category-card-icon.pinyin-icon {
  background: rgba(255, 154, 86, 0.12);
  color: var(--color-primary);
}

.category-card-icon.radical-icon {
  background: rgba(80, 227, 194, 0.12);
  color: var(--color-accent-dark);
}

.category-card-icon.stroke-icon {
  background: rgba(100, 120, 255, 0.12);
  color: #6478FF;
}

.category-card-icon.poly-icon {
  background: rgba(200, 80, 200, 0.12);
  color: #C850C8;
}

.category-card-title {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: var(--space-sm);
  position: relative;
}

.category-card-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  position: relative;
}

/* Popular Characters */
.popular-chars {
  padding-bottom: var(--space-3xl);
}

.popular-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
  gap: var(--space-sm);
}

.popular-char-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md) var(--space-sm);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.popular-char-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
  color: var(--color-text);
}

.popular-char-link .char {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
}

.popular-char-link .py {
  font-size: 0.7rem;
  color: var(--color-primary);
  margin-top: var(--space-xs);
  font-family: 'Nunito', sans-serif;
}

/* ============================================================
   CHARACTER DETAIL PAGE
   ============================================================ */
.char-hero {
  background: var(--gradient-char-bg);
  padding: var(--space-2xl) 0 var(--space-xl);
  position: relative;
  overflow: hidden;
}

.char-hero::after {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 154, 86, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.char-hero-inner {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.char-display-wrapper {
  position: relative;
  flex-shrink: 0;
}

.char-display {
  width: 160px;
  height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
  font-weight: 900;
  color: var(--color-text);
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  position: relative;
  border: 1px solid var(--color-border);
  line-height: 1;
}

.char-display::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: calc(var(--radius-xl) + 3px);
  background: var(--gradient-primary);
  z-index: -1;
  opacity: 0.4;
}

.char-hero-info {
  flex: 1;
  min-width: 250px;
}

.char-hero-info h1 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  margin-bottom: var(--space-md);
  line-height: 1.3;
}

.char-pinyin-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.pinyin-badge {
  display: inline-flex;
  align-items: center;
  padding: 6px 16px;
  background: var(--gradient-primary);
  color: white;
  border-radius: var(--radius-full);
  font-size: 1.1rem;
  font-weight: 700;
  font-family: 'Nunito', sans-serif;
  box-shadow: var(--shadow-glow-primary);
  letter-spacing: 0.5px;
}

.char-english-def {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  font-style: italic;
  margin-top: var(--space-sm);
  font-family: 'Nunito', sans-serif;
}

/* Character App Handoff */
.character-app-handoff {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-xl);
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--color-border);
}

.app-handoff-copy {
  max-width: 680px;
}

.app-handoff-eyebrow {
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  margin-bottom: var(--space-xs);
}

.app-handoff-copy h2 {
  font-size: clamp(1.2rem, 2.2vw, 1.55rem);
  line-height: 1.35;
  margin-bottom: var(--space-xs);
}

.app-handoff-copy p {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.app-handoff-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.app-handoff-primary,
.app-handoff-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.app-handoff-primary {
  color: white;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-glow-primary);
}

.app-handoff-secondary {
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.app-handoff-primary:hover,
.app-handoff-secondary:hover {
  transform: translateY(-1px);
}

.app-handoff-qr {
  display: grid;
  justify-items: center;
  gap: var(--space-xs);
  color: var(--color-text-tertiary);
  font-size: 0.78rem;
  text-align: center;
}

.app-handoff-qr-code {
  width: 132px;
  height: 132px;
  display: grid;
  place-items: center;
  padding: 10px;
  border-radius: var(--radius-md);
  background: white;
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.app-handoff-qr-code svg {
  width: 100%;
  height: 100%;
  display: block;
}

.app-handoff-qr-code a {
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 800;
  text-decoration: none;
}

.app-handoff-qr p {
  margin: 0;
}

/* Stroke Animation Section */
.stroke-section {
  padding: var(--space-xl) 0;
}

.stroke-animation-container {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

#stroke-animation-target {
  width: 200px;
  height: 200px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.stroke-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.stroke-btn {
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
}

.stroke-btn:hover {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow-primary);
}

.stroke-btn.primary {
  background: var(--gradient-primary);
  color: white;
  border: none;
  box-shadow: var(--shadow-glow-primary);
}

.stroke-btn.primary:hover {
  transform: scale(1.03);
}

.stroke-order-text {
  font-size: 1.5rem;
  letter-spacing: 4px;
  color: var(--color-text-secondary);
  margin-top: var(--space-sm);
  font-family: 'Noto Serif SC', serif;
}

/* Info Grid */
.char-info-section {
  padding: var(--space-xl) 0;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--space-md);
}

.info-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.info-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.info-card-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-sm);
}

.info-card-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  font-family: 'Noto Serif SC', serif;
}

.info-card-value a {
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 2px solid var(--color-primary-light);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.info-card-value a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.info-card-value.mono {
  font-family: 'Nunito', 'SF Mono', 'Fira Code', monospace;
  letter-spacing: 1px;
}

/* Definitions */
.definitions-section {
  padding: var(--space-xl) 0;
}

.definition-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-sm);
}

.definition-block h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-md);
}

.definition-content {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

.definition-content p {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
  position: relative;
}

.definition-content p::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 4px;
  height: 4px;
  background: var(--color-primary);
  border-radius: 50%;
}

.definition-content .def-heading {
  font-weight: 700;
  color: var(--color-text);
  padding-left: 0;
  margin-bottom: var(--space-md);
  margin-top: var(--space-lg);
  font-size: 1.05rem;
}

.definition-content .def-heading::before {
  display: none;
}

/* English definition */
.english-def-section {
  padding: 0 0 var(--space-xl);
}

.english-def-card {
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
}

.english-def-card .label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-sm);
}

.english-def-card .value {
  font-size: 1.1rem;
  font-family: 'Nunito', sans-serif;
  color: var(--color-text);
  font-weight: 600;
}

/* Word Examples */
.words-section {
  padding: var(--space-xl) 0;
}

.words-table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.words-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  table-layout: fixed;
}

.words-table thead {
  background: var(--color-surface-alt);
}

.words-table th {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-tertiary);
  border-bottom: 1px solid var(--color-border);
}

.words-table td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
  vertical-align: top;
}

.words-table th:nth-child(1),
.words-table td:nth-child(1) {
  width: 148px;
  white-space: nowrap;
}

.words-table th:nth-child(2),
.words-table td:nth-child(2) {
  width: 190px;
  white-space: nowrap;
}

.words-table tbody tr {
  background: var(--color-surface);
  transition: background var(--transition-fast);
}

.words-table tbody tr:hover {
  background: var(--color-surface-alt);
}

.words-table tbody tr:last-child td {
  border-bottom: none;
}

.word-link {
  display: inline-block;
  font-family: 'Noto Serif SC', serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  white-space: nowrap;
  word-break: keep-all;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.word-link:hover {
  color: var(--color-primary);
}

.word-pinyin {
  display: inline-block;
  color: var(--color-primary);
  font-family: 'Nunito', sans-serif;
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  word-break: keep-all;
}

.word-def {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  overflow-wrap: break-word;
}

/* Related Characters */
.related-section {
  padding: var(--space-xl) 0;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: var(--space-sm);
}

.related-char-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-md) var(--space-sm);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.related-char-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
  color: var(--color-text);
}

.related-char-link .char {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
}

.related-char-link .py {
  font-size: 0.7rem;
  color: var(--color-primary);
  margin-top: var(--space-xs);
  font-family: 'Nunito', sans-serif;
}

/* ============================================================
   INDEX PAGES (Pinyin / Radical / Stroke)
   ============================================================ */
.index-hero {
  background: var(--gradient-hero);
  padding: var(--space-2xl) 0;
  text-align: center;
}

.index-hero h1 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.index-hero .subtitle {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.not-found-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.not-found-actions a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1.2rem;
  border-radius: var(--radius-full);
  font-weight: 800;
}

.not-found-actions .btn-primary {
  color: white;
  background: var(--gradient-primary);
  box-shadow: var(--shadow-sm);
}

.not-found-actions .btn-secondary {
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.index-content {
  padding: var(--space-xl) 0 var(--space-3xl);
}

.char-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--space-md);
}

.char-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.char-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
  color: var(--color-text);
}

.char-card .card-char {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.char-card .card-pinyin {
  font-size: 0.85rem;
  color: var(--color-primary);
  font-weight: 600;
  font-family: 'Nunito', sans-serif;
  margin-bottom: var(--space-xs);
}

.char-card .card-meta {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  text-align: center;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.char-card,
.poly-card,
.popular-char-link,
.related-char-link,
.radical-hub-card,
.stroke-hub-card,
.pinyin-hub-card {
  content-visibility: auto;
  contain-intrinsic-size: 120px;
}

/* Polyphonic page character card */
.poly-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--space-lg) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  box-shadow: var(--shadow-sm);
}

.poly-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-light);
  color: var(--color-text);
}

.poly-card .card-char {
  font-family: 'Noto Serif SC', serif;
  font-size: 2.5rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.poly-card .card-readings {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  justify-content: center;
}

.poly-card .reading-tag {
  font-size: 0.8rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 154, 86, 0.1);
  color: var(--color-primary-dark);
  font-weight: 600;
  font-family: 'Nunito', sans-serif;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-md);
  padding-bottom: var(--space-xl);
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

.pagination a,
.pagination span {
  min-width: 88px;
  text-align: center;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.pagination a {
  color: var(--color-primary);
  font-weight: 700;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.pagination a:hover {
  transform: translateY(-1px);
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-sm);
}

.pagination span[aria-disabled="true"] {
  color: var(--color-text-tertiary);
}

/* ============================================================
   APP DOWNLOAD CTA
   ============================================================ */
.app-cta {
  padding: var(--space-3xl) 0;
}

.app-cta-card {
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl) var(--space-xl);
  color: white;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow-primary);
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(280px, 1.22fr);
  gap: var(--space-2xl);
  align-items: center;
  text-align: left;
}

.app-cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.app-cta-content {
  position: relative;
  z-index: 1;
}

.app-cta-card h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: var(--space-sm);
  position: relative;
}

.app-cta-card p {
  font-size: 1rem;
  opacity: 0.9;
  margin-bottom: var(--space-md);
  position: relative;
}

.app-feature-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  position: relative;
}

.app-feature-chips span {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.34);
  background: rgba(255, 255, 255, 0.14);
  color: white;
  font-size: 0.82rem;
  font-weight: 700;
  line-height: 1.2;
}

.app-badges {
  display: flex;
  justify-content: flex-start;
  gap: var(--space-md);
  flex-wrap: wrap;
  position: relative;
}

.app-badge {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-width: 148px;
  min-height: 54px;
  padding: 8px 16px;
  background: #11111A;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 14px;
  color: white;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}

.app-badge:hover {
  background: #242433;
  transform: translateY(-2px);
  color: white;
}

.app-badge span {
  font-size: 1rem;
  line-height: 1.05;
}

.app-badge small {
  font-size: 0.64rem;
  line-height: 1;
  letter-spacing: 0.02em;
  opacity: 0.72;
}

.app-badge em {
  font-size: 0.68rem;
  font-style: normal;
  line-height: 1;
  opacity: 0.78;
}

.app-badge.is-disabled {
  cursor: default;
  opacity: 0.72;
}

.app-badge.is-disabled:hover {
  background: #11111A;
  transform: none;
}

.app-cta-pager {
  width: 100%;
  height: clamp(280px, 30vw, 360px);
  min-height: 0;
  position: relative;
  z-index: 1;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.38);
  background: rgba(255, 255, 255, 0.22);
  box-shadow: 0 18px 48px rgba(100, 53, 20, 0.24);
}

.app-cta-pager .screenshot-pager-track {
  padding-top: var(--space-md);
  padding-bottom: 42px;
}

.app-cta-pager .screenshot-slide {
  flex-basis: 304px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-2xl) 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-xl);
  flex-wrap: wrap;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .footer-logo {
  font-family: 'Noto Serif SC', serif;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links-group {
  display: flex;
  gap: var(--space-2xl);
  flex-wrap: wrap;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer-col a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-primary);
}

.footer-link-muted {
  font-size: 0.9rem;
  color: var(--color-text-tertiary);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

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

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-fadeInUp {
  animation: fadeInUp 0.6s ease-out both;
}

.animate-fadeIn {
  animation: fadeIn 0.5s ease-out both;
}

.animate-scaleIn {
  animation: scaleIn 0.4s ease-out both;
}

/* Staggered children */
.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 60ms; }
.stagger > *:nth-child(3) { animation-delay: 120ms; }
.stagger > *:nth-child(4) { animation-delay: 180ms; }
.stagger > *:nth-child(5) { animation-delay: 240ms; }
.stagger > *:nth-child(6) { animation-delay: 300ms; }
.stagger > *:nth-child(7) { animation-delay: 360ms; }
.stagger > *:nth-child(8) { animation-delay: 420ms; }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}

/* ============================================================
   GLASSMORPHISM HELPERS
   ============================================================ */
.glass {
  background: var(--color-surface-glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border: 1px solid var(--color-surface-glass-border);
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .char-grid {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 16px;
    --nav-height: 56px;
  }

  .char-hero-inner {
    flex-direction: column;
    text-align: center;
  }

  .char-pinyin-list {
    justify-content: center;
  }

  .character-app-handoff {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .app-handoff-copy {
    margin: 0 auto;
  }

  .app-handoff-actions {
    justify-content: center;
  }

  .info-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .char-grid {
    grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
    gap: var(--space-sm);
  }

  .footer-inner {
    flex-direction: column;
  }

  .stats-bar {
    gap: var(--space-lg);
  }

  .hero {
    padding: var(--space-3xl) 0 var(--space-2xl);
  }

  .category-cards {
    grid-template-columns: repeat(2, 1fr);
  }

  .stroke-animation-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .app-cta-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .app-badges {
    justify-content: center;
  }

  .app-feature-chips {
    justify-content: center;
  }

  .app-cta-pager {
    height: 330px;
    min-height: 0;
  }

  .app-cta-pager .screenshot-slide {
    flex-basis: min(72%, 240px);
  }
}

@media (max-width: 480px) {
  .info-grid {
    grid-template-columns: 1fr;
  }

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

  .char-display {
    width: 130px;
    height: 130px;
    font-size: 4.5rem;
  }

  .app-cta-card {
    padding: var(--space-xl) var(--space-md);
    gap: var(--space-xl);
  }

  .screenshot-pager-track {
    gap: 12px;
    padding: 16px 58px 42px;
    scroll-padding: 0 58px;
  }

  .screenshot-slide {
    flex-basis: 174px;
    border-radius: 18px;
  }

  .screenshot-pager-prev {
    left: var(--space-sm);
  }

  .screenshot-pager-next {
    right: var(--space-sm);
  }

  .app-cta-pager {
    height: 310px;
  }

  .app-cta-pager .screenshot-slide {
    flex-basis: min(76%, 230px);
  }

  .app-badge {
    width: 100%;
    max-width: 240px;
  }

  .words-table th,
  .words-table td {
    padding: var(--space-sm) var(--space-md);
    font-size: 0.85rem;
  }
}

/* ============================================================
   NAV DOWNLOAD BUTTON + QR POPUP
   ============================================================ */
.nav-download-wrapper {
  position: relative;
}

.nav-download {
  background: var(--gradient-primary) !important;
  color: white !important;
  padding: 6px 16px !important;
  border-radius: var(--radius-full) !important;
  font-weight: 700 !important;
  font-size: 0.85rem !important;
  box-shadow: var(--shadow-glow-primary);
  transition: all var(--transition-fast) !important;
  border: none;
  cursor: pointer;
  font-family: inherit;
  line-height: 1.5;
}

.nav-download:hover {
  transform: scale(1.05) !important;
  box-shadow: 0 4px 20px rgba(255, 154, 86, 0.4) !important;
}

/* QR Popup */
.nav-qr-popup {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  width: 220px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
  z-index: 1000;
  pointer-events: none;
}

.nav-qr-popup.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.nav-qr-popup-inner {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--space-lg);
  text-align: center;
  position: relative;
}

/* Arrow */
.nav-qr-popup-inner::before {
  content: '';
  position: absolute;
  top: -7px;
  right: 24px;
  width: 14px;
  height: 14px;
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  border-top: 1px solid var(--color-border);
  transform: rotate(45deg);
}

.nav-qr-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.nav-qr-code {
  width: 160px;
  height: 160px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-qr-code svg {
  width: 100% !important;
  height: 100% !important;
}

.nav-qr-hint {
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-sm);
  line-height: 1.4;
}

/* --- App CTA QR Code --- */
.app-download-area {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-top: var(--space-md);
  position: relative;
  z-index: 2;
}

.app-cta-qr-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  padding: 12px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  width: 140px;
  height: 140px;
  flex-shrink: 0;
}

.app-cta-qr-code {
  width: 116px;
  height: 116px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.app-cta-qr-code svg {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

/* Mobile: move popup to center */
@media (max-width: 768px) {
  .app-download-area {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-md);
  }
  
  .app-cta-qr-wrap {
    display: none;
  }

  .nav-qr-popup {
    position: fixed;
    top: auto;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    transform: translateY(100%);
    border-radius: 0;
  }

  .nav-qr-popup.is-open {
    transform: translateY(0);
  }

  .nav-qr-popup-inner {
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    padding: var(--space-xl) var(--space-lg) var(--space-2xl);
  }

  .nav-qr-popup-inner::before {
    display: none;
  }

  .nav-qr-code {
    width: 200px;
    height: 200px;
  }
}

/* ============================================================
   HUB PAGES — RADICAL / STROKE OVERVIEW GRIDS
   ============================================================ */

/* --- Pinyin Hub --- */
.pinyin-hub-groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.pinyin-group h2 {
  font-size: 1.2rem;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}

.pinyin-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: var(--space-sm);
}

.pinyin-hub-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 88px;
  padding: var(--space-md) var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
}

.pinyin-hub-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary-light);
  color: var(--color-text);
}

.pinyin-hub-card .hub-pinyin {
  font-family: 'Nunito', sans-serif;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--color-primary);
}

.pinyin-hub-card .hub-count {
  margin-top: 2px;
  font-size: 0.72rem;
  color: var(--color-text-tertiary);
  font-weight: 600;
}

/* --- Radical Hub --- */
.radical-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: var(--space-md);
}

.radical-hub-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg) var(--space-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  box-shadow: var(--shadow-sm);
  min-height: 110px;
}

.radical-hub-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-light);
  color: var(--color-text);
}

.radical-hub-card .hub-char {
  font-family: 'Noto Serif SC', serif;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: var(--space-sm);
}

.radical-hub-card .hub-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.radical-hub-card .hub-pinyin {
  font-size: 0.75rem;
  color: var(--color-primary);
  font-family: 'Nunito', sans-serif;
  font-weight: 600;
}

.radical-hub-card .hub-count {
  font-size: 0.7rem;
  color: var(--color-text-tertiary);
  font-weight: 600;
}

/* --- Stroke Hub --- */
.stroke-hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: var(--space-md);
}

.stroke-hub-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl) var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: color var(--transition-base), background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  box-shadow: var(--shadow-sm);
  min-height: 120px;
  position: relative;
  overflow: hidden;
}

.stroke-hub-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-card);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.stroke-hub-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-light);
  color: var(--color-text);
}

.stroke-hub-card:hover::before {
  opacity: 1;
}

.stroke-hub-card .hub-number {
  font-family: 'Nunito', sans-serif;
  font-size: 2.5rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  position: relative;
}

.stroke-hub-card .hub-label {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  font-weight: 600;
  margin-top: 2px;
  position: relative;
}

.stroke-hub-card .hub-count {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
  font-weight: 600;
  position: relative;
}

@media (max-width: 768px) {
  .radical-hub-grid {
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: var(--space-sm);
  }

  .stroke-hub-grid {
    grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: var(--space-sm);
  }

  .radical-hub-card .hub-char {
    font-size: 1.6rem;
  }

  .stroke-hub-card .hub-number {
    font-size: 2rem;
  }
}

/* ============================================================
   PRINT
   ============================================================ */
@media print {
  .site-nav,
  .theme-toggle,
  .menu-toggle,
  .app-cta,
  .site-footer {
    display: none !important;
  }

  body {
    background: white;
    color: black;
  }
}