/* 钗头凤 · 红酥手 — 忧伤错过的沈园词意 */

:root {
  --ctf-ink: #0c0e12;
  --ctf-ink-soft: #161a22;
  --ctf-wine: #6b2438;
  --ctf-wine-deep: #3d1525;
  --ctf-peach: #c48a8a;
  --ctf-peach-fade: rgba(196, 138, 138, 0.35);
  --ctf-gold: #9a7b5a;
  --ctf-gold-dim: rgba(154, 123, 90, 0.5);
  --ctf-paper: rgba(245, 236, 228, 0.94);
  --ctf-muted: rgba(220, 210, 200, 0.65);
  --ctf-glass: rgba(14, 16, 22, 0.78);
  --ctf-border: rgba(154, 123, 90, 0.28);
  --ctf-radius: 4px;
  --font-serif: 'Songti SC', 'STSong', 'SimSun', 'FangSong', 'KaiTi', 'STKaiti', serif;
  --font-sans: system-ui, 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  color: var(--ctf-paper);
  background: var(--ctf-ink);
  overflow-x: hidden;
  line-height: 1.85;
}

#ctf-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.ctf-mist {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(107, 36, 56, 0.15), transparent 55%),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(60, 80, 100, 0.12), transparent 50%);
}

.ctf-grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* —— 导航 —— */
.ctf-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.5rem;
  background: linear-gradient(180deg, rgba(12, 14, 18, 0.9) 0%, transparent 100%);
}

.ctf-nav__brand {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  letter-spacing: 0.35em;
  color: var(--ctf-peach);
  text-decoration: none;
}

.ctf-nav__links {
  display: flex;
  gap: 1.1rem;
}

.ctf-nav__links a {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--ctf-muted);
  text-decoration: none;
  letter-spacing: 0.08em;
}

.ctf-nav__links a:hover {
  color: var(--ctf-paper);
}

.ctf-nav__back {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--ctf-gold-dim);
  text-decoration: none;
  border: 1px solid var(--ctf-border);
  padding: 0.3rem 0.75rem;
  border-radius: 2px;
}

.ctf-nav__back:hover {
  color: var(--ctf-peach);
  border-color: var(--ctf-peach-fade);
}

/* —— 主内容 —— */
.ctf-main {
  position: relative;
  z-index: 2;
}

.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 5rem 1.25rem 3.5rem;
}

.ctf-panel {
  width: 100%;
  max-width: 42rem;
  padding: 2rem 1.75rem;
  background: var(--ctf-glass);
  border: 1px solid var(--ctf-border);
  border-radius: var(--ctf-radius);
  backdrop-filter: blur(16px);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.ctf-panel--wide {
  max-width: 54rem;
}

.section.is-visible .ctf-panel {
  opacity: 1;
  transform: translateY(0);
}

.ctf-h2 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.4em;
  color: var(--ctf-gold);
  margin: 0 0 1rem;
  text-indent: 0.4em;
}

.ctf-lead {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--ctf-muted);
  margin: 0 0 1.25rem;
}

.ctf-panel p {
  margin: 0 0 1rem;
  font-size: 0.98rem;
}

.ctf-aside {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--ctf-muted);
  border-left: 2px solid var(--ctf-wine);
  padding-left: 1rem;
  margin-top: 1.25rem;
}

.ctf-note {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--ctf-muted);
  margin: 1.25rem 0 0;
}

/* —— Hero —— */
.ctf-hero {
  flex-direction: column;
  text-align: center;
}

.ctf-hero__dynasty {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--ctf-muted);
  margin: 0 0 1rem;
}

.ctf-hero__title {
  margin: 0 0 1.25rem;
}

.ctf-hero__line {
  display: block;
  font-size: clamp(3rem, 14vw, 5.5rem);
  font-weight: 600;
  letter-spacing: 0.45em;
  text-indent: 0.45em;
  color: var(--ctf-paper);
  text-shadow: 0 0 40px rgba(196, 138, 138, 0.35);
}

.ctf-hero__sub {
  display: block;
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  letter-spacing: 0.55em;
  text-indent: 0.55em;
  color: var(--ctf-peach);
  margin-top: 0.5rem;
}

.ctf-hero__lead {
  font-size: 1.05rem;
  color: var(--ctf-muted);
  max-width: 22em;
  margin: 0 auto 2.5rem;
  line-height: 2;
}

.ctf-hero__scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--ctf-gold-dim);
  animation: ctf-float 3s ease-in-out infinite;
}

.ctf-chevron {
  display: block;
  width: 10px;
  height: 10px;
  border-right: 1px solid var(--ctf-peach);
  border-bottom: 1px solid var(--ctf-peach);
  transform: rotate(45deg);
}

@keyframes ctf-float {
  0%, 100% { transform: translateY(0); opacity: 0.7; }
  50% { transform: translateY(6px); opacity: 1; }
}

/* —— 词章 —— */
.ctf-panel--poem {
  text-align: center;
}

.ctf-poem-block {
  margin: 1.5rem 0;
  padding: 1.5rem 1rem;
  border: 1px solid rgba(107, 36, 56, 0.4);
  background: rgba(61, 21, 37, 0.25);
  border-radius: var(--ctf-radius);
}

.ctf-poem-block--dim {
  opacity: 0.92;
  border-color: rgba(154, 123, 90, 0.25);
}

.ctf-stanza + .ctf-stanza {
  margin-top: 1.75rem;
  padding-top: 1.75rem;
  border-top: 1px dashed rgba(154, 123, 90, 0.25);
}

.ctf-poem-line {
  font-size: clamp(1rem, 3.5vw, 1.2rem);
  letter-spacing: 0.12em;
  margin: 0 0 0.65rem;
  line-height: 2;
}

.ctf-poem-line--triad {
  font-size: clamp(1.35rem, 5vw, 1.75rem);
  color: var(--ctf-peach);
  letter-spacing: 0.35em;
  text-indent: 0.35em;
  margin-top: 1rem;
  animation: ctf-pulse 4s ease-in-out infinite;
}

.ctf-poem-line--mo {
  color: #a87888;
}

@keyframes ctf-pulse {
  0%, 100% { opacity: 0.85; }
  50% { opacity: 1; text-shadow: 0 0 20px rgba(196, 138, 138, 0.4); }
}

.ctf-quote {
  margin: 1.5rem 0 0;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--ctf-wine);
  background: rgba(0, 0, 0, 0.2);
}

.ctf-quote p {
  font-size: 1.05rem;
  letter-spacing: 0.15em;
  margin: 0 0 0.5rem;
  color: var(--ctf-peach);
}

.ctf-quote footer {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--ctf-muted);
}

/* —— 意象网格 —— */
.ctf-imagery-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 30rem) {
  .ctf-imagery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 48rem) {
  .ctf-imagery-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.ctf-imagery-card {
  padding: 1.15rem 1rem;
  border: 1px solid rgba(107, 36, 56, 0.35);
  background: rgba(22, 26, 34, 0.6);
  border-radius: var(--ctf-radius);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.35s;
  transform-style: preserve-3d;
}

.ctf-imagery-card:hover {
  border-color: var(--ctf-peach-fade);
  box-shadow: 0 8px 28px rgba(107, 36, 56, 0.25);
}

.ctf-imagery-card h3 {
  font-size: 1rem;
  color: var(--ctf-gold);
  margin: 0 0 0.5rem;
  letter-spacing: 0.08em;
}

.ctf-imagery-card p {
  font-family: var(--font-sans);
  font-size: 0.82rem;
  color: var(--ctf-muted);
  margin: 0;
  line-height: 1.65;
}

/* —— 页脚 —— */
.ctf-footer {
  flex-direction: column;
  text-align: center;
  min-height: 50vh;
}

.ctf-footer__text {
  font-size: 1rem;
  letter-spacing: 0.2em;
  margin: 0 0 0.5rem;
}

.ctf-footer__sub {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--ctf-muted);
  margin: 0 0 1.5rem;
}

.ctf-btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--ctf-paper);
  text-decoration: none;
  padding: 0.55rem 1.4rem;
  border: 1px solid var(--ctf-border);
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}

.ctf-btn:hover {
  background: rgba(107, 36, 56, 0.4);
  color: var(--ctf-peach);
}

@media (max-width: 640px) {
  .ctf-nav__links { display: none; }
  .ctf-hero__line { letter-spacing: 0.25em; text-indent: 0.25em; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ctf-panel { transition: none; opacity: 1; transform: none; }
  .ctf-hero__scroll, .ctf-poem-line--triad { animation: none; }
}