/* ============================================
   幽明录 · Hidden and Visible Realms
   You Ming Lu — Records of the Hidden and Visible
   ============================================ */

/* --- CSS Custom Properties (shared with Ghost Lore) --- */
:root {
  --ink-cyan: #2C3E50;
  --paper-white: #F5F1E8;
  --candle-yellow: #D4A574;
  --indigo: #5B8A72;
  --cinnabar: #C73E3A;
  --ink-light: rgba(44, 62, 80, 0.85);
  --ink-faint: rgba(44, 62, 80, 0.15);
  --ink-border: rgba(44, 62, 80, 0.12);
  --paper-warm: #EDE8DC;
  --paper-deep: #E5DFD2;
  --candle-glow: rgba(212, 165, 116, 0.15);
  --cinnabar-light: rgba(199, 62, 58, 0.1);
  --shadow-soft: rgba(44, 62, 80, 0.08);
  --shadow-medium: rgba(44, 62, 80, 0.15);

  --font-serif-cn: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;
  --font-serif-en: 'Crimson Text', 'Georgia', serif;
  --font-display-en: 'Cinzel', 'Georgia', serif;
  --font-sans-cn: 'Noto Sans SC', 'Source Han Sans SC', 'Microsoft YaHei', sans-serif;
  --font-sans-en: 'Inter', 'Helvetica Neue', sans-serif;

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

  --max-width: 1280px;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-serif-cn);
  color: var(--ink-cyan);
  background-color: var(--paper-white);
  line-height: 1.8;
  letter-spacing: 0.02em;
  overflow-x: hidden;
}
a { color: var(--indigo); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--candle-yellow); }
img { max-width: 100%; height: auto; display: block; }

/* --- Navigation --- */
.site-nav {
  background-color: var(--ink-cyan);
  color: var(--paper-white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 0 0 var(--ink-cyan);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--paper-white);
  font-family: var(--font-serif-cn);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}
.nav-brand .seal {
  width: 36px;
  height: 36px;
  border: 2px solid var(--cinnabar);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: var(--cinnabar);
  font-weight: 700;
  transform: rotate(-3deg);
}
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--paper-white);
  font-size: 1.5rem;
  cursor: pointer;
}
.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
  align-items: center;
}
.nav-links a {
  color: var(--paper-white);
  font-family: var(--font-sans-cn);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}
.nav-links a:hover { opacity: 1; color: var(--candle-yellow); }
.nav-lang-toggle {
  display: flex;
  gap: var(--space-xs);
}
.nav-lang-toggle button {
  background: none;
  border: 1px solid rgba(245,241,232,0.2);
  color: var(--paper-white);
  font-size: 0.75rem;
  padding: 4px 10px;
  cursor: pointer;
  font-family: var(--font-sans-en);
  letter-spacing: 0.05em;
  transition: all var(--transition-fast);
}
.nav-lang-toggle button.active {
  background: var(--candle-yellow);
  color: var(--ink-cyan);
  border-color: var(--candle-yellow);
}

/* Language toggle */
[data-lang="en"] { display: none; }
body.lang-en [data-lang="cn"] { display: none; }
body.lang-en [data-lang="en"] { display: unset; }

/* --- Breadcrumb --- */
.breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-sans-cn);
  font-size: 0.8rem;
  color: rgba(44, 62, 80, 0.5);
}
.breadcrumb a {
  color: rgba(44, 62, 80, 0.6);
  transition: color var(--transition-fast);
}
.breadcrumb a:hover { color: var(--candle-yellow); }
.breadcrumb .sep {
  margin: 0 var(--space-sm);
  opacity: 0.4;
}
.breadcrumb .current {
  color: var(--candle-yellow);
  font-weight: 500;
}

/* Breadcrumb dark variant (for hero pages) */
.breadcrumb-dark {
  background: var(--ink-cyan);
}
.breadcrumb-dark,
.breadcrumb-dark a { color: rgba(245,241,232,0.5); }
.breadcrumb-dark a:hover { color: var(--candle-yellow); }
.breadcrumb-dark .current { color: var(--candle-yellow); }

/* --- Book Hero --- */
.book-hero {
  position: relative;
  min-height: 75vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  background: var(--ink-cyan);
}
.book-hero .hero-bg {
  position: absolute; inset: 0; z-index: 1;
}
.book-hero .hero-bg::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 30% 40%, rgba(91,138,114,0.15), transparent),
    radial-gradient(ellipse 60% 80% at 70% 60%, rgba(212,165,116,0.08), transparent),
    radial-gradient(ellipse 100% 100% at 50% 50%, rgba(44,62,80,0.9), transparent);
  animation: inkFlow 12s ease-in-out infinite alternate;
}
@keyframes inkFlow {
  0% { opacity: 1; }
  100% { opacity: 0.7; }
}
.book-hero .hero-particles {
  position: absolute; inset: 0; z-index: 2; overflow: hidden;
}
.book-hero .particle {
  position: absolute; width: 3px; height: 3px;
  background: rgba(245,241,232,0.15); border-radius: 50%;
  animation: float linear infinite;
}
@keyframes float {
  0% { transform: translateY(100vh); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(-10vh); opacity: 0; }
}
.book-hero .particle:nth-child(1) { left: 10%; animation-duration: 18s; }
.book-hero .particle:nth-child(2) { left: 25%; animation-duration: 22s; animation-delay: 3s; }
.book-hero .particle:nth-child(3) { left: 40%; animation-duration: 16s; animation-delay: 1s; }
.book-hero .particle:nth-child(4) { left: 55%; animation-duration: 20s; animation-delay: 5s; }
.book-hero .particle:nth-child(5) { left: 70%; animation-duration: 24s; animation-delay: 2s; }
.book-hero .particle:nth-child(6) { left: 85%; animation-duration: 19s; animation-delay: 4s; }
.book-hero .hero-content {
  position: relative; z-index: 3;
  padding: var(--space-3xl) var(--space-xl);
}
.book-hero .seal-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 80px; height: 80px;
  border: 2px solid var(--cinnabar);
  color: var(--cinnabar);
  font-family: var(--font-serif-cn);
  font-size: 1.8rem; font-weight: 700;
  margin-bottom: var(--space-lg);
  transform: rotate(-3deg);
  line-height: 1.2;
}
.book-hero .hero-title-cn {
  font-family: var(--font-serif-cn);
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 700; color: var(--paper-white);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
  background: linear-gradient(135deg, #F5F1E8 0%, #D4A574 40%, #F5F1E8 60%, #D4A574 100%);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.book-hero .hero-title-en {
  font-family: var(--font-display-en);
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  color: var(--candle-yellow);
  letter-spacing: 0.2em; text-transform: uppercase;
  margin-bottom: var(--space-xl); opacity: 0.9;
}
.book-hero .hero-meta {
  font-family: var(--font-sans-cn);
  font-size: 0.9rem; color: rgba(245,241,232,0.6);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.05em;
}
.book-hero .hero-meta strong { color: var(--candle-yellow); font-weight: 500; }
.book-hero .hero-subtitle {
  font-family: var(--font-serif-cn);
  font-size: 1.05rem; color: rgba(245,241,232,0.65);
  max-width: 600px; margin: var(--space-lg) auto 0;
  line-height: 1.9;
}
.book-hero .hero-subtitle-en {
  font-family: var(--font-serif-en);
  font-size: 0.9rem; font-style: italic;
  color: rgba(245,241,232,0.4);
  max-width: 500px; margin: var(--space-sm) auto 0;
}

/* --- Section Cards Grid --- */
.section-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-xl);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.section-card {
  background: var(--paper-white);
  border: 1px solid var(--ink-border);
  padding: 0;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  cursor: pointer;
  position: relative;
  overflow: visible;
}
.section-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px var(--shadow-medium);
}
.section-card:hover .card-accent { width: 100%; }
.section-card:hover .card-body { position: relative; z-index: 1; }
.card-icon-bar {
  height: 40px;
  background: var(--ink-border);
  position: relative;
  overflow: visible;
}
.card-icon-bar .card-accent {
  position: absolute; bottom: 0; left: 0;
  width: 0; height: 6px;
  background: var(--candle-yellow);
  transition: width var(--transition-normal);
}
.card-icon-bar .card-icon {
  position: absolute; bottom: -26px; right: 20px;
  width: 52px; height: 52px;
  background: var(--ink-cyan);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  border: 2px solid var(--paper-white);
  z-index: 2;
}
.card-body {
  padding: calc(var(--space-lg) + 20px) var(--space-xl) var(--space-xl);
}
.card-number {
  font-family: var(--font-display-en);
  font-size: 0.7rem; letter-spacing: 0.15em;
  text-transform: uppercase; color: var(--candle-yellow);
  margin-bottom: var(--space-sm);
}
.card-title-cn {
  font-family: var(--font-serif-cn);
  font-size: 1.35rem; font-weight: 600;
  margin-bottom: 2px;
  color: var(--ink-cyan);
}
.card-title-en {
  font-family: var(--font-display-en);
  font-size: 0.85rem; color: var(--candle-yellow);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}
.card-theme-label {
  font-family: var(--font-sans-cn);
  font-size: 0.75rem; color: var(--indigo);
  margin-bottom: var(--space-sm);
}
.card-desc {
  font-family: var(--font-serif-cn);
  font-size: 0.9rem; color: var(--ink-light);
  line-height: 1.8;
}
.card-desc-en {
  font-family: var(--font-serif-en);
  font-size: 0.85rem; color: rgba(44,62,80,0.5);
  font-style: italic; line-height: 1.6;
  margin-top: var(--space-sm);
}
.card-tags {
  display: flex; gap: var(--space-xs);
  flex-wrap: wrap; margin-top: var(--space-md);
}
.card-tags .tag {
  padding: 3px 8px; font-size: 0.65rem;
  font-family: var(--font-sans-cn);
  border: 1px solid var(--ink-border);
  color: var(--ink-light);
}

/* --- Book Info Section --- */
.book-info-section {
  padding: var(--space-3xl) 0;
  background: var(--ink-cyan); color: var(--paper-white);
}
.book-info-inner {
  max-width: var(--max-width);
  margin: 0 auto; padding: 0 var(--space-xl);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-2xl);
}
.info-block h3 {
  font-family: var(--font-sans-cn);
  font-size: 0.75rem; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--candle-yellow);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid rgba(245,241,232,0.1);
}
.info-block p, .info-block li {
  font-size: 0.9rem; line-height: 1.8;
  opacity: 0.8;
}
.info-block ul { list-style: none; }
.info-block li {
  padding: var(--space-xs) 0;
  border-bottom: 1px solid rgba(245,241,232,0.05);
}
.info-block li a {
  color: var(--paper-white); opacity: 0.8;
  transition: opacity var(--transition-fast);
}
.info-block li a:hover { opacity: 1; color: var(--candle-yellow); }
.info-block .highlight { color: var(--candle-yellow); font-weight: 500; }

/* --- Content Page Styles --- */
.content-hero {
  position: relative;
  padding: var(--space-3xl) var(--space-xl) var(--space-2xl);
  background: var(--ink-cyan);
  text-align: center;
  min-height: 40vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.content-hero .hero-bg {
  position: absolute; inset: 0; z-index: 1;
}
.content-hero .hero-bg::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 30% 40%, rgba(91,138,114,0.12), transparent),
    radial-gradient(ellipse 100% 100% at 50% 50%, rgba(44,62,80,0.95), transparent);
}
.content-hero .hero-content {
  position: relative; z-index: 2;
}
.content-hero .section-label {
  font-family: var(--font-display-en);
  font-size: 0.7rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--candle-yellow);
  margin-bottom: var(--space-sm);
}
.content-hero .hero-title-cn {
  font-family: var(--font-serif-cn);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700; color: var(--paper-white);
  letter-spacing: 0.12em;
  margin-bottom: var(--space-sm);
}
.content-hero .hero-title-en {
  font-family: var(--font-display-en);
  font-size: clamp(0.9rem, 2vw, 1.3rem);
  color: var(--candle-yellow);
  letter-spacing: 0.15em; text-transform: uppercase;
  margin-bottom: var(--space-lg); opacity: 0.85;
}
.content-hero .hero-desc {
  font-family: var(--font-serif-en);
  font-size: 1rem; font-style: italic;
  color: rgba(245,241,232,0.55);
  max-width: 560px; margin: 0 auto;
  line-height: 1.8;
}

/* --- Article Content --- */
.article-wrap {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl);
}
.article-meta {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--ink-border);
  font-family: var(--font-sans-cn);
  font-size: 0.8rem;
  color: rgba(44,62,80,0.5);
}
.article-meta .meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}
.article-meta .meta-label {
  color: var(--candle-yellow);
  font-weight: 500;
}

.article-body {
  font-family: var(--font-serif-en);
  font-size: 1.05rem;
  line-height: 2;
  color: var(--ink-light);
}
.article-body h2 {
  font-family: var(--font-display-en);
  font-size: 1.4rem;
  color: var(--ink-cyan);
  letter-spacing: 0.08em;
  margin: var(--space-2xl) 0 var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--candle-glow);
}
.article-body h3 {
  font-family: var(--font-serif-cn);
  font-size: 1.15rem;
  color: var(--ink-cyan);
  margin: var(--space-xl) 0 var(--space-md);
}
.article-body p {
  margin-bottom: var(--space-lg);
}
.article-body blockquote {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  border-left: 3px solid var(--candle-yellow);
  background: var(--candle-glow);
  font-style: italic;
  color: var(--ink-cyan);
}
.article-body .chinese-text {
  font-family: var(--font-serif-cn);
  font-size: 1rem;
  line-height: 2;
  color: var(--ink-cyan);
  background: var(--paper-warm);
  padding: var(--space-xl);
  margin: var(--space-xl) 0;
  border: 1px solid var(--ink-border);
}
.article-body .cultural-note {
  margin: var(--space-xl) 0;
  padding: var(--space-lg) var(--space-xl);
  background: var(--paper-warm);
  border-left: 3px solid var(--indigo);
  font-size: 0.9rem;
}
.article-body .cultural-note strong {
  color: var(--indigo);
  display: block;
  margin-bottom: var(--space-sm);
  font-family: var(--font-sans-cn);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* --- Prev/Next Navigation --- */
.story-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-lg);
  max-width: 800px;
  margin: 0 auto var(--space-3xl);
  padding: 0 var(--space-xl);
}
.story-nav a {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg) var(--space-xl);
  border: 1px solid var(--ink-border);
  flex: 1;
  transition: all var(--transition-normal);
}
.story-nav a:hover {
  border-color: var(--candle-yellow);
  box-shadow: 0 4px 16px var(--shadow-soft);
}
.story-nav .nav-label {
  font-family: var(--font-display-en);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--candle-yellow);
  margin-bottom: var(--space-xs);
}
.story-nav .nav-title {
  font-family: var(--font-serif-cn);
  font-size: 1rem;
  color: var(--ink-cyan);
}
.story-nav .next { text-align: right; }

/* --- Footer --- */
.site-footer {
  background: var(--ink-cyan);
  color: var(--paper-white);
  padding: var(--space-3xl) 0 var(--space-xl);
}
.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-2xl);
}
.footer-brand .name {
  font-family: var(--font-serif-cn);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-sm);
}
.footer-brand .desc {
  font-size: 0.85rem;
  opacity: 0.6;
  line-height: 1.8;
}
.footer-col h4 {
  font-family: var(--font-sans-cn);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--candle-yellow);
  margin-bottom: var(--space-md);
}
.footer-col ul { list-style: none; }
.footer-col li { padding: var(--space-xs) 0; }
.footer-col a {
  color: var(--paper-white);
  opacity: 0.7;
  font-size: 0.85rem;
  transition: opacity var(--transition-fast);
}
.footer-col a:hover { opacity: 1; color: var(--candle-yellow); }
.footer-bottom {
  max-width: var(--max-width);
  margin: var(--space-2xl) auto 0;
  padding: var(--space-lg) var(--space-xl) 0;
  border-top: 1px solid rgba(245,241,232,0.1);
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  opacity: 0.5;
}

/* --- Fade-in Animation --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-hamburger { display: block; }
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--ink-cyan);
    flex-direction: column;
    padding: var(--space-lg) var(--space-xl);
    gap: var(--space-md);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
  }
  .nav-links.open { display: flex; }
  .nav-lang-toggle { margin-left: auto; }

  .book-hero { min-height: 60vh; }
  .book-hero .seal-icon { width: 60px; height: 60px; font-size: 1.4rem; }

  .section-cards {
    grid-template-columns: 1fr;
    padding: 0 var(--space-lg);
  }

  .book-info-inner {
    grid-template-columns: 1fr;
    padding: 0 var(--space-lg);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .breadcrumb { padding: var(--space-sm) var(--space-lg); }

  .content-hero { min-height: 30vh; padding: var(--space-2xl) var(--space-lg); }
  .article-wrap { padding: var(--space-2xl) var(--space-lg); }
  .story-nav { flex-direction: column; padding: 0 var(--space-lg); }
}

@media (max-width: 480px) {
  .book-hero .hero-title-cn { font-size: 2rem; }
  .book-hero .hero-title-en { font-size: 0.9rem; }
  .card-body { padding: calc(var(--space-lg) + 16px) var(--space-lg) var(--space-lg); }
}