/* ============================================================
   🍵 Tea Encyclopedia — Design System & Global Styles
   Oriental aesthetics meets modern minimalism
   ============================================================ */

/* === Google Fonts === */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700;900&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* === CSS Custom Properties (Design Tokens) === */
:root {
  /* Colors — Dark oriental palette */
  --bg-primary: #0d1a0d;
  --bg-secondary: #142114;
  --bg-tertiary: #1a2e1a;
  --bg-card: rgba(26, 46, 26, 0.6);
  --bg-card-hover: rgba(35, 60, 35, 0.8);
  --bg-glass: rgba(255, 255, 255, 0.03);
  --bg-glass-hover: rgba(255, 255, 255, 0.06);

  /* Text */
  --text-primary: #f5f0e8;
  --text-secondary: #c4bfb4;
  --text-tertiary: #8a8578;
  --text-accent: #c8a96e;

  /* Accent colors */
  --gold: #c8a96e;
  --gold-light: #dcc08a;
  --gold-dark: #a68b4b;
  --green-tea: #7fb069;
  --white-tea: #e8dfd1;
  --yellow-tea: #d4a843;
  --oolong-tea: #5a9e6f;
  --red-tea: #c75b39;
  --dark-tea: #5c4a3a;

  /* Tea category accent colors */
  --cat-green: #7fb069;
  --cat-white: #d8cfc0;
  --cat-yellow: #d4a843;
  --cat-oolong: #3a8a5c;
  --cat-red: #c75b39;
  --cat-dark: #6b5344;
  --cat-flower: #d4789c;
  --cat-citrus: #e8943a;
  --cat-chenpi: #c47a2e;
  --cat-compressed: #8b7355;
  --cat-extract: #6aab9e;

  /* Borders */
  --border-subtle: rgba(200, 169, 110, 0.15);
  --border-medium: rgba(200, 169, 110, 0.25);
  --border-accent: rgba(200, 169, 110, 0.5);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(200, 169, 110, 0.15);

  /* Typography */
  --font-serif: 'Noto Serif SC', 'Songti SC', serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast: 0.2s var(--ease-out);
  --transition-base: 0.35s var(--ease-out);
  --transition-slow: 0.6s var(--ease-out);

  /* Layout */
  --container-max: 1280px;
  --container-wide: 1440px;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--gold-dark);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--gold);
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
h4 { font-size: 1.15rem; }

p {
  color: var(--text-secondary);
  line-height: 1.8;
}

a {
  color: var(--gold);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--gold-light);
}

/* === Container === */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}

/* Animated background gradient */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(200, 169, 110, 0.08) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, rgba(127, 176, 105, 0.06) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 80% 20%, rgba(90, 158, 111, 0.05) 0%, transparent 50%);
  animation: heroGlow 12s ease-in-out infinite alternate;
  z-index: 0;
}

@keyframes heroGlow {
  0% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.05); }
  100% { opacity: 0.8; transform: scale(1.02); }
}

/* Floating tea leaves decoration */
.hero-decoration {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.floating-leaf {
  position: absolute;
  font-size: 2rem;
  opacity: 0.12;
  animation: floatLeaf 20s ease-in-out infinite;
}

.floating-leaf:nth-child(1) { left: 10%; top: 20%; animation-delay: 0s; animation-duration: 18s; }
.floating-leaf:nth-child(2) { left: 80%; top: 15%; animation-delay: -4s; animation-duration: 22s; }
.floating-leaf:nth-child(3) { left: 25%; top: 70%; animation-delay: -8s; animation-duration: 16s; }
.floating-leaf:nth-child(4) { left: 70%; top: 65%; animation-delay: -12s; animation-duration: 20s; }
.floating-leaf:nth-child(5) { left: 50%; top: 40%; animation-delay: -6s; animation-duration: 24s; }
.floating-leaf:nth-child(6) { left: 90%; top: 80%; animation-delay: -10s; animation-duration: 19s; }

@keyframes floatLeaf {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-30px) rotate(10deg); }
  50% { transform: translateY(-15px) rotate(-5deg); }
  75% { transform: translateY(-40px) rotate(8deg); }
}

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

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: clamp(0.9rem, 2vw, 1.15rem);
  color: var(--text-tertiary);
  letter-spacing: 0.35em;
  text-transform: uppercase;
  margin-bottom: var(--space-lg);
  font-weight: 300;
}

.hero-title {
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 900;
  background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 40%, var(--gold-dark) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: var(--space-lg);
  letter-spacing: 0.08em;
  text-shadow: none;
}

.hero-desc {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
  line-height: 1.8;
}

/* Decorative line */
.hero-line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin: var(--space-xl) auto;
  border: none;
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  z-index: 1;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition-base);
}
.scroll-indicator:hover {
  opacity: 1;
}

.scroll-indicator span {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  letter-spacing: 0.2em;
}

.scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); opacity: 0.6; }
  50% { transform: rotate(45deg) translateY(8px); opacity: 1; }
}

/* ============================================================
   STICKY NAVIGATION
   ============================================================ */
.nav-sticky {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 26, 13, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-md) 0;
  transition: all var(--transition-base);
}

.nav-sticky.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.nav-logo {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gold);
  white-space: nowrap;
}

.nav-tabs {
  display: flex;
  gap: var(--space-xs);
  list-style: none;
}

.nav-tab {
  padding: var(--space-sm) var(--space-lg);
  font-size: 0.9rem;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
  white-space: nowrap;
}

.nav-tab:hover {
  color: var(--text-primary);
  background: var(--bg-glass-hover);
  border-color: var(--border-subtle);
}

.nav-tab.active {
  color: var(--bg-primary);
  background: var(--gold);
  border-color: var(--gold);
  font-weight: 500;
}

/* Search box */
.nav-search {
  position: relative;
}

.nav-search input {
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: var(--space-sm) var(--space-lg);
  padding-left: 2.5rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  width: 200px;
  outline: none;
  transition: all var(--transition-fast);
}

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

.nav-search input:focus {
  border-color: var(--gold);
  background: var(--bg-glass-hover);
  width: 260px;
  box-shadow: var(--shadow-glow);
}

.nav-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  font-size: 0.85rem;
  pointer-events: none;
}

/* ============================================================
   SECTION LAYOUT
   ============================================================ */
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--gold);
  background: rgba(200, 169, 110, 0.1);
  padding: var(--space-xs) var(--space-lg);
  border-radius: var(--radius-full);
  border: 1px solid var(--border-subtle);
  margin-bottom: var(--space-lg);
}

.section-title {
  margin-bottom: var(--space-md);
}

.section-desc {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1rem;
}

/* ============================================================
   FERMENTATION SPECTRUM BAR
   ============================================================ */
.spectrum-bar {
  max-width: 900px;
  margin: 0 auto var(--space-3xl);
  padding: var(--space-xl) var(--space-2xl);
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(10px);
}

.spectrum-label {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-lg);
  letter-spacing: 0.15em;
}

.spectrum-track {
  position: relative;
  height: 8px;
  background: rgba(255,255,255,0.05);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-2xl);
  overflow: visible;
}

.spectrum-gradient {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg,
    var(--cat-green) 0%,
    var(--cat-white) 15%,
    var(--cat-yellow) 30%,
    var(--cat-oolong) 50%,
    var(--cat-red) 75%,
    var(--cat-dark) 100%
  );
  opacity: 0.8;
}

.spectrum-markers {
  display: flex;
  justify-content: space-between;
  position: relative;
}

.spectrum-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  cursor: pointer;
  transition: transform var(--transition-fast);
}

.spectrum-marker:hover {
  transform: translateY(-3px);
}

.spectrum-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--bg-primary);
  box-shadow: 0 0 0 2px currentColor;
  transition: all var(--transition-fast);
}

.spectrum-marker:hover .spectrum-dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 2px currentColor, 0 0 12px currentColor;
}

.spectrum-name {
  font-size: 0.78rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.spectrum-pct {
  font-size: 0.65rem;
  color: var(--text-tertiary);
}

/* ============================================================
   TEA CATEGORY SECTION
   ============================================================ */
.tea-category {
  margin-bottom: var(--space-4xl);
  scroll-margin-top: 80px;
}

.category-header {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--border-subtle);
}

.category-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.category-info {
  flex: 1;
}

.category-name {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.category-meta {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
}

.category-tag {
  font-size: 0.78rem;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.category-tag .tag-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}

/* ============================================================
   TEA CARDS GRID
   ============================================================ */
.tea-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
}

.tea-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: default;
  /* Animation setup */
  opacity: 0;
  transform: translateY(30px);
}

.tea-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.tea-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  background: var(--bg-card-hover);
}

.tea-card.visible:hover {
  transform: translateY(-6px);
}

/* Card image */
.tea-card-img {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--bg-tertiary);
}

.tea-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.tea-card:hover .tea-card-img img {
  transform: scale(1.08);
}

/* Image overlay gradient */
.tea-card-img::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 50%;
  background: linear-gradient(to top, var(--bg-card), transparent);
  pointer-events: none;
}

/* Category badge on image */
.tea-badge {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  color: #fff;
  font-weight: 500;
  letter-spacing: 0.05em;
  z-index: 2;
  backdrop-filter: blur(8px);
}

/* Card body */
.tea-card-body {
  padding: var(--space-lg);
}

.tea-card-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.tea-card-name-en {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-md);
  font-style: italic;
}

/* Info grid inside card */
.tea-card-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.tea-info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-sm);
  background: var(--bg-glass);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255,255,255,0.03);
}

.tea-info-label {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.tea-info-value {
  font-size: 0.85rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* Temperature indicator */
.temp-bar {
  width: 100%;
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-full);
  margin-top: 4px;
  overflow: hidden;
}

.temp-bar-fill {
  height: 100%;
  border-radius: var(--radius-full);
  transition: width 1s var(--ease-out);
}

/* Storage info — full width */
.tea-info-storage {
  grid-column: 1 / -1;
}

/* ============================================================
   LAYER 3: NAMING TABLE
   ============================================================ */
.naming-table-wrapper {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.naming-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.naming-table thead {
  background: rgba(200, 169, 110, 0.08);
}

.naming-table th {
  padding: var(--space-md) var(--space-lg);
  text-align: left;
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--gold);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-medium);
}

.naming-table td {
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  vertical-align: top;
}

.naming-table tbody tr {
  transition: background var(--transition-fast);
}

.naming-table tbody tr:hover {
  background: var(--bg-glass-hover);
}

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

.naming-highlight {
  color: var(--gold);
  font-weight: 500;
}

.naming-actual {
  display: inline-block;
  font-size: 0.75rem;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: rgba(200, 169, 110, 0.1);
  border: 1px solid var(--border-subtle);
  color: var(--gold);
}

/* ============================================================
   BREWING GUIDE SECTION
   ============================================================ */
.brew-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-2xl);
}

.brew-card {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(20px);
}

.brew-card.visible {
  opacity: 1;
  transform: translateY(0);
}

.brew-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

.brew-card.visible:hover {
  transform: translateY(-4px);
}

.brew-thermometer {
  position: relative;
  width: 48px;
  height: 100px;
  margin: 0 auto var(--space-md);
  background: rgba(255,255,255,0.04);
  border-radius: 24px 24px 24px 24px;
  border: 2px solid var(--border-subtle);
  overflow: hidden;
}

.brew-mercury {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  border-radius: 0 0 22px 22px;
  transition: height 1.5s var(--ease-out);
}

.brew-temp {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.brew-name {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.brew-emoji {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-3xl) 0;
  text-align: center;
}

.footer-quote {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text-tertiary);
  font-style: italic;
  margin-bottom: var(--space-lg);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

.footer-author {
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xl);
}

.footer-copy {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  opacity: 0.6;
}

/* ============================================================
   SCROLL REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger animation for grid children */
.tea-card:nth-child(1) { transition-delay: 0.05s; }
.tea-card:nth-child(2) { transition-delay: 0.12s; }
.tea-card:nth-child(3) { transition-delay: 0.19s; }
.tea-card:nth-child(4) { transition-delay: 0.26s; }
.tea-card:nth-child(5) { transition-delay: 0.33s; }
.tea-card:nth-child(6) { transition-delay: 0.40s; }
.tea-card:nth-child(7) { transition-delay: 0.47s; }
.tea-card:nth-child(8) { transition-delay: 0.54s; }
.tea-card:nth-child(9) { transition-delay: 0.61s; }
.tea-card:nth-child(10) { transition-delay: 0.68s; }
.tea-card:nth-child(11) { transition-delay: 0.75s; }
.tea-card:nth-child(12) { transition-delay: 0.82s; }

.brew-card:nth-child(1) { transition-delay: 0.05s; }
.brew-card:nth-child(2) { transition-delay: 0.10s; }
.brew-card:nth-child(3) { transition-delay: 0.15s; }
.brew-card:nth-child(4) { transition-delay: 0.20s; }
.brew-card:nth-child(5) { transition-delay: 0.25s; }
.brew-card:nth-child(6) { transition-delay: 0.30s; }

/* ============================================================
   TEA CARD MODAL / DETAIL OVERLAY
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-xl);
  max-width: 520px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--transition-base);
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-body {
  padding: var(--space-xl) var(--space-2xl) var(--space-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.modal-header {
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-sm);
}

.modal-title-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
}

.modal-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--gold);
  letter-spacing: 0.05em;
}

.modal-subtitle {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: 4px;
}

.modal-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-sm);
}

.modal-badge {
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.modal-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.modal-section-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--gold-light);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  border-left: 3px solid var(--gold);
  padding-left: var(--space-sm);
  margin-bottom: var(--space-xs);
}

.modal-text {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-secondary);
  text-align: justify;
}

.modal-poem {
  font-family: var(--font-serif);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-accent);
  background: rgba(200, 169, 110, 0.04);
  border: 1px dashed rgba(200, 169, 110, 0.2);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  text-align: center;
  white-space: pre-line;
  margin: var(--space-xs) 0;
  letter-spacing: 0.1em;
}

.modal-book {
  font-weight: 500;
  color: var(--gold);
}

.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  z-index: 201;
}

.modal-close:hover {
  background: rgba(200, 169, 110, 0.3);
  border-color: var(--gold);
}

/* ============================================================
   SECTION DIVIDERS
   ============================================================ */
.section-divider {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin: var(--space-4xl) 0;
  opacity: 0.4;
}

.section-divider::before,
.section-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}

.section-divider span {
  font-size: 1.5rem;
}

/* ============================================================
   PLACEHOLDER IMAGE (for missing tea images)
   ============================================================ */
.tea-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  font-size: 3rem;
}

/* ============================================================
   NO RESULTS
   ============================================================ */
.no-results {
  text-align: center;
  padding: var(--space-4xl) var(--space-xl);
  color: var(--text-tertiary);
  display: none;
}

.no-results.active {
  display: block;
}

.no-results-emoji {
  font-size: 3rem;
  margin-bottom: var(--space-md);
}

/* ============================================================
   RESPONSIVE DESIGN
   ============================================================ */
@media (max-width: 1024px) {
  .tea-grid {
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-lg);
  }

  .nav-inner {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .nav-tabs {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav-tab {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8rem;
  }

  .nav-search input {
    width: 100%;
  }
  .nav-search input:focus {
    width: 100%;
  }
  .nav-search {
    width: 100%;
  }

  .tea-grid {
    grid-template-columns: 1fr;
  }

  .spectrum-bar {
    padding: var(--space-lg);
    overflow-x: auto;
  }

  .spectrum-markers {
    min-width: 500px;
  }

  .brew-grid {
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  }

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

  .category-header {
    flex-direction: column;
    text-align: center;
  }

  .category-meta {
    justify-content: center;
  }

  .naming-table {
    font-size: 0.8rem;
  }

  .naming-table th,
  .naming-table td {
    padding: var(--space-sm) var(--space-md);
  }
}

@media (max-width: 480px) {
  .hero-title {
    letter-spacing: 0.03em;
  }

  .tea-card-info {
    grid-template-columns: 1fr;
  }

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

/* ============================================================
   UTILITY: hidden sections
   ============================================================ */
.layer-section {
  transition: opacity 0.5s var(--ease-out), max-height 0.5s var(--ease-out);
}

.layer-section.hidden {
  display: none;
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--gold);
  color: var(--bg-primary);
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition-base);
  box-shadow: var(--shadow-md);
  z-index: 99;
}

.back-to-top.show {
  opacity: 1;
  pointer-events: all;
}

.back-to-top:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
}