/* ============================================================
   红楼读书会 (Honglou Club) — Design System
   Classical Chinese aesthetic · Bold red · Refined · Elegant
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@300;400;500;600;700&family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;0,700;1,300;1,400&display=swap');

:root {
  --color-red: #7A1020;
  --color-red-light: #8A1A2A;
  --color-red-dark: #5C0A14;
  --color-gold: #D4A94E;
  --color-gold-light: #E0BF6A;
  --color-gold-dark: #B8942A;
  --color-text: rgba(253,248,240,0.90);
  --color-text-muted: rgba(253,248,240,0.55);
  --color-border: rgba(212,169,78,0.18);

  --font-cn: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', 'STSong', serif;
  --font-en: 'Cormorant Garamond', 'EB Garamond', 'Georgia', 'Times New Roman', serif;

  --max-width: 1200px;
  --nav-height: 72px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-cn);
  color: var(--color-text);
  background-color: var(--color-red);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-cn);
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-text);
}
h1 { font-size: clamp(2.2rem, 4vw, 3.2rem); letter-spacing: 0.08em; }
h2 { font-size: clamp(1.8rem, 3vw, 2.4rem); letter-spacing: 0.06em; }
h3 { font-size: clamp(1.3rem, 2vw, 1.6rem); letter-spacing: 0.04em; }
h4 { font-size: 1.15rem; letter-spacing: 0.03em; }

.en-text { font-family: var(--font-en); letter-spacing: 0.04em; }

p { margin-bottom: 1.2rem; font-weight: 300; }

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

/* ---- Utility ---- */
.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md); }
.section { padding: var(--spacing-xl) 0; background-color: var(--color-red); }
.section-alt { background-color: var(--color-red-dark); }

.section-title {
  text-align: center; margin-bottom: var(--spacing-lg); position: relative;
  color: var(--color-gold-light);
}
.section-title::after {
  content: ''; display: block; width: 60px; height: 2px;
  background: var(--color-gold); margin: var(--spacing-sm) auto 0;
}
.section-subtitle {
  text-align: center; color: var(--color-text-muted); font-size: 0.95rem;
  margin-top: -1.5rem; margin-bottom: var(--spacing-lg);
  font-family: var(--font-en); font-style: italic;
}

/* ---- Seal ---- */
.seal {
  display: inline-block; width: 52px; height: 52px;
  border: 2px solid var(--color-gold); color: var(--color-gold);
  font-size: 0.7rem; text-align: center; line-height: 48px;
  transform: rotate(-5deg); font-family: var(--font-cn); font-weight: 600; flex-shrink: 0;
}

/* ============================================================
   Navigation
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-height);
  background: rgba(122, 16, 32, 0.94);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(212,169,78,0.18);
  transition: background var(--transition);
}
.nav.scrolled { background: rgba(92, 10, 20, 0.98); box-shadow: 0 2px 20px rgba(0,0,0,0.3); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--spacing-md);
}
.nav-logo {
  display: flex; align-items: center; gap: var(--spacing-xs);
  text-decoration: none; color: var(--color-gold);
  font-weight: 600; font-size: 1.15rem; letter-spacing: 0.06em;
}
.nav-links { display: flex; align-items: center; gap: var(--spacing-md); list-style: none; }
.nav-links a {
  color: rgba(253,248,240,0.75); font-size: 0.9rem; letter-spacing: 0.04em;
  padding: 0.4rem 0; position: relative; transition: color var(--transition);
}
.nav-links a::after {
  content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 1px;
  background: var(--color-gold); transition: width var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--color-gold); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }
.nav-links a.nav-external,
.nav-links a.nav-external:link,
.nav-links a.nav-external:visited {
  color: rgba(253,248,240,0.75); text-decoration: none;
}
.nav-links a.nav-external::after { width: 0; }
.nav-links a.nav-external:hover,
.nav-links a.nav-external:active { color: var(--color-gold); }
.nav-links a.nav-external:hover::after { width: 100%; }

.lang-switch {
  display: flex; align-items: center; gap: 0.3rem;
  margin-left: var(--spacing-sm); padding-left: var(--spacing-sm);
  border-left: 1px solid rgba(253,248,240,0.2);
}
.lang-switch a {
  font-size: 0.8rem; color: rgba(253,248,240,0.45); padding: 0.2rem 0.4rem;
  transition: color var(--transition); font-weight: 400;
}
.lang-switch a.active { color: var(--color-gold); font-weight: 600; }
.lang-switch span { color: rgba(253,248,240,0.2); font-size: 0.8rem; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 4px;
}
.nav-toggle span {
  display: block; width: 24px; height: 1.5px; background: var(--color-gold);
  transition: transform var(--transition), opacity var(--transition);
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  position: relative; overflow: hidden;
  background: linear-gradient(180deg, var(--color-red-dark) 0%, var(--color-red) 40%, var(--color-red-light) 100%);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(212,169,78,0.07) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 80%, rgba(212,169,78,0.05) 0%, transparent 50%);
  pointer-events: none;
}
.hero::after {
  content: ''; position: absolute; inset: 0;
  background: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(212,169,78,0.012) 2px, rgba(212,169,78,0.012) 3px);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; text-align: center; max-width: 700px; padding: var(--spacing-lg); }
.hero-seal { margin: 0 auto var(--spacing-md); }

.hero-emblem {
  width: 130px; height: 130px; border-radius: 50%;
  border: 2px solid var(--color-gold);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  margin: 0 auto var(--spacing-md);
  color: var(--color-gold);
  font-family: var(--font-cn);
  font-weight: 600; font-size: 1.6rem;
  line-height: 1.45; letter-spacing: 0.04em;
  position: relative;
}
.hero-emblem::before {
  content: ''; position: absolute; inset: 6px; border-radius: 50%;
  border: 1px solid rgba(212,169,78,0.35); pointer-events: none;
}

.hero h1 {
  font-size: clamp(2.8rem, 5vw, 4rem); color: var(--color-gold);
  margin-bottom: var(--spacing-sm); letter-spacing: 0.12em; font-weight: 600;
}
.hero-title {
  font-family: var(--font-cn);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  color: var(--color-gold-light);
  letter-spacing: 0.1em;
  font-weight: 500;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}
.hero .tagline {
  font-size: clamp(1rem, 1.5vw, 1.2rem); color: rgba(253,248,240,0.7);
  line-height: 2; margin-bottom: var(--spacing-lg);
}
.hero .btn {
  display: inline-block; padding: 0.8rem 2.4rem; border: 1px solid var(--color-gold);
  color: var(--color-gold); font-family: var(--font-cn); font-size: 0.95rem;
  letter-spacing: 0.08em; transition: all var(--transition); cursor: pointer;
}
.hero .btn:hover { background: var(--color-gold); color: var(--color-red-dark); }

.scroll-indicator {
  position: absolute; bottom: var(--spacing-lg); left: 50%; transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  color: rgba(253,248,240,0.35); font-size: 0.75rem; letter-spacing: 0.06em;
  animation: float 2s ease-in-out infinite;
}
.scroll-indicator .line { width: 1px; height: 40px; background: linear-gradient(to bottom, var(--color-gold), transparent); }
@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-8px); }
}

/* ============================================================
   Feature Cards
   ============================================================ */
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.feature-card {
  background: rgba(253,248,240,0.05); padding: var(--spacing-lg) var(--spacing-md);
  text-align: center; border: 1px solid var(--color-border); position: relative; transition: all var(--transition);
}
.feature-card:hover {
  transform: translateY(-4px); background: rgba(253,248,240,0.10);
  border-color: var(--color-gold); box-shadow: 0 8px 40px rgba(0,0,0,0.35);
}
.feature-card .icon { font-size: 2.4rem; margin-bottom: var(--spacing-sm); }
.feature-card h3 { margin-bottom: var(--spacing-xs); font-size: 1.2rem; color: var(--color-gold-light); }
.feature-card p { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 0; }

/* ============================================================
   Content Grid
   ============================================================ */
.content-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); align-items: center; }
.content-grid.reverse { direction: rtl; }
.content-grid.reverse > * { direction: ltr; }
.content-image { width: 100%; aspect-ratio: 4/3; object-fit: cover; border: 1px solid rgba(212,169,78,0.25); }

.deco-panel {
  width: 100%; aspect-ratio: 4/3; border: 1px solid rgba(212,169,78,0.2);
  background: linear-gradient(135deg, var(--color-red-dark) 0%, var(--color-red) 40%, var(--color-red-light) 100%);
  position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center;
}
.deco-panel::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(212,169,78,0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(212,169,78,0.05) 0%, transparent 50%);
}
.deco-panel::after {
  content: ''; position: absolute; top: 10%; left: 10%; right: 10%; bottom: 10%;
  border: 1px solid rgba(212,169,78,0.18); pointer-events: none;
}
.deco-panel .deco-inner { position: relative; z-index: 1; text-align: center; }
.deco-panel .deco-char {
  font-size: 4rem; font-family: var(--font-cn); font-weight: 600;
  color: rgba(212,169,78,0.14); line-height: 1;
}
.deco-panel .deco-label {
  font-size: 0.75rem; color: rgba(212,169,78,0.4); margin-top: 0.5rem;
  font-family: var(--font-en); font-style: italic; letter-spacing: 0.06em;
}

.content-text h2 { margin-bottom: var(--spacing-sm); color: var(--color-gold); }
.content-text .en-subtitle {
  font-family: var(--font-en); font-style: italic; color: var(--color-gold-light);
  margin-bottom: var(--spacing-md); font-size: 1rem;
}

/* ---- Quote ---- */
.quote-block { text-align: center; padding: var(--spacing-xl) var(--spacing-md); position: relative; }
.quote-block::before {
  content: ''; display: block; width: 40px; height: 2px;
  background: var(--color-gold); margin: 0 auto var(--spacing-md);
}
.quote-block blockquote {
  font-size: clamp(1.2rem, 2vw, 1.6rem); font-family: var(--font-cn);
  color: var(--color-gold); line-height: 2; letter-spacing: 0.06em;
  max-width: 700px; margin: 0 auto; font-weight: 300;
}
.quote-block .attribution {
  margin-top: var(--spacing-sm); font-family: var(--font-en); font-style: italic;
  color: var(--color-text-muted); font-size: 0.9rem;
}

.divider-ornament { text-align: center; padding: var(--spacing-md) 0; color: var(--color-gold); font-size: 1.2rem; letter-spacing: 0.5em; user-select: none; }

/* ============================================================
   Gallery
   ============================================================ */
.gallery-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--spacing-sm); margin-top: var(--spacing-lg); }
.gallery-item {
  aspect-ratio: 3/4; overflow: hidden; border: 1px solid var(--color-border);
  position: relative; cursor: pointer; transition: all var(--transition);
  background: var(--color-red-light); display: flex; align-items: center; justify-content: center;
}
.gallery-item:hover { border-color: var(--color-gold); box-shadow: 0 4px 20px rgba(0,0,0,0.35); }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1); }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-item .gallery-placeholder {
  text-align: center; color: rgba(212,169,78,0.12); font-size: 4rem;
  font-family: var(--font-cn); font-weight: 600; pointer-events: none;
}
.gallery-item .caption {
  position: absolute; bottom: 0; left: 0; right: 0;
  background: linear-gradient(transparent, rgba(0,0,0,0.6)); color: var(--color-text);
  padding: var(--spacing-md) var(--spacing-sm) var(--spacing-sm); font-size: 0.85rem; letter-spacing: 0.04em;
}

/* ============================================================
   Character Cards
   ============================================================ */
.chars-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--spacing-md); margin-top: var(--spacing-lg); }
.char-card {
  text-align: center; padding: var(--spacing-md); border: 1px solid var(--color-border);
  background: rgba(253,248,240,0.05); transition: all var(--transition);
}
.char-card:hover { border-color: var(--color-gold); background: rgba(253,248,240,0.10); box-shadow: 0 4px 20px rgba(0,0,0,0.35); }
.char-card h4 { color: var(--color-gold-light); margin-bottom: 0.3rem; font-size: 1.1rem; }
.char-card .en-name {
  font-family: var(--font-en); font-style: italic; color: var(--color-text-muted);
  font-size: 0.85rem; margin-bottom: var(--spacing-xs);
}
.char-card .role { font-size: 0.85rem; color: rgba(253,248,240,0.55); }

/* ============================================================
   Events
   ============================================================ */
.events-list { max-width: 700px; margin: 0 auto; }
.event-item {
  display: flex; gap: var(--spacing-md); padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border); transition: all var(--transition);
}
.event-item:hover { padding-left: var(--spacing-sm); }
.event-date { flex-shrink: 0; width: 70px; text-align: center; padding-top: 4px; }
.event-date .day {
  display: block; font-size: 1.8rem; font-weight: 300; color: var(--color-gold);
  line-height: 1; font-family: var(--font-en);
}
.event-date .month { display: block; font-size: 0.8rem; color: var(--color-text-muted); letter-spacing: 0.06em; }
.event-info h4 { margin-bottom: 0.2rem; }
.event-info p { color: var(--color-text-muted); font-size: 0.9rem; margin-bottom: 0; }
.event-meta { font-size: 0.8rem; color: var(--color-text-muted); }

/* ============================================================
   Form
   ============================================================ */
.form-wrapper { max-width: 560px; margin: 0 auto; }
.form-group { margin-bottom: var(--spacing-md); }
.form-group label { display: block; margin-bottom: 0.4rem; font-size: 0.9rem; letter-spacing: 0.04em; color: rgba(253,248,240,0.7); }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%; padding: 0.8rem 1rem; border: 1px solid rgba(212,169,78,0.22);
  background: rgba(253,248,240,0.06); font-family: var(--font-cn); font-size: 0.95rem;
  color: var(--color-text); transition: border-color var(--transition); outline: none;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus { border-color: var(--color-gold); }
.form-group textarea { min-height: 140px; resize: vertical; }
.btn-submit {
  display: inline-block; padding: 0.8rem 2.8rem; background: var(--color-gold);
  color: var(--color-red-dark); border: none; font-family: var(--font-cn);
  font-size: 0.95rem; font-weight: 600; letter-spacing: 0.08em;
  cursor: pointer; transition: all var(--transition);
}
.btn-submit:hover { background: var(--color-gold-light); }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: #4A0812; color: rgba(253,248,240,0.55); padding: var(--spacing-lg) 0;
  font-size: 0.85rem; border-top: 1px solid rgba(212,169,78,0.12);
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: var(--spacing-lg); }
.footer h4 { color: var(--color-gold); margin-bottom: var(--spacing-sm); font-size: 0.95rem; }
.footer a { color: rgba(253,248,240,0.4); transition: color var(--transition); }
.footer a:hover { color: var(--color-gold); }
.footer p { margin-bottom: 0.5rem; }
.footer-bottom {
  margin-top: var(--spacing-lg); padding-top: var(--spacing-md);
  border-top: 1px solid rgba(253,248,240,0.06); text-align: center;
  font-size: 0.8rem; color: rgba(253,248,240,0.25);
}

/* ============================================================
   Page Header
   ============================================================ */
.page-header {
  padding: calc(var(--nav-height) + var(--spacing-xl)) 0 var(--spacing-lg);
  text-align: center;
  background: linear-gradient(180deg, var(--color-red-dark) 0%, var(--color-red) 100%);
  border-bottom: 1px solid rgba(212,169,78,0.08);
}
.page-header h1 { color: var(--color-gold); }
.page-header .en-subtitle {
  font-family: var(--font-en); font-style: italic; color: var(--color-gold-light);
  font-size: 1rem; margin-top: var(--spacing-xs);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .chars-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root { --nav-height: 60px; --spacing-xl: 4rem; --spacing-lg: 2.5rem; }
  .nav-links {
    position: fixed; top: var(--nav-height); left: 0; right: 0; bottom: 0;
    background: rgba(92, 10, 20, 0.98); backdrop-filter: blur(16px);
    flex-direction: column; justify-content: center; gap: var(--spacing-lg);
    transform: translateX(100%); transition: transform var(--transition);
  }
  .nav-links.open { transform: translateX(0); }
  .nav-links a { font-size: 1.1rem; }
  .lang-switch { margin-left: 0; padding-left: 0; border-left: none; margin-top: var(--spacing-sm); }
  .nav-toggle { display: flex; }
  .features-grid { grid-template-columns: 1fr; }
  .content-grid { grid-template-columns: 1fr; }
  .chars-grid { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .event-item { flex-direction: column; gap: var(--spacing-xs); }
  .event-date { display: flex; gap: 0.5rem; align-items: baseline; }
}

@media (max-width: 480px) {
  .chars-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
}

/* ============================================================
   Animations
   ============================================================ */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.8s ease, transform 0.8s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }
.page-transition { animation: pageIn 0.5s ease; }
@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}