@import url('https://fonts.googleapis.com/css2?family=Crimson+Text:wght@400;600;700&family=EB+Garamond:wght@400;500;600;700;800&display=swap');

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

html { scroll-behavior: smooth; }

:root {
  --ink: #171f26;
  --ice: #c8e0f4;
  --rose: #f5e0e8;
  --text: #e7eef4;
  --muted: #a0b5c4;
  --lift: 8px 8px 22px rgba(0, 0, 0, 0.55), -6px -6px 18px rgba(140, 180, 210, 0.09);
  --lift-hard: 12px 12px 30px rgba(0, 0, 0, 0.6), -8px -8px 24px rgba(150, 190, 215, 0.10);
  --sink: inset 8px 8px 20px rgba(0, 0, 0, 0.55), inset -7px -7px 18px rgba(140, 180, 210, 0.08);
  --r-lg: 28px;
  --r-md: 16px;
  --r-sm: 14px;
}

body {
  margin: 0;
  padding-bottom: 152px;
  font-family: 'EB Garamond', 'Crimson Text', 'Songti SC', 'Noto Serif SC', Georgia, serif;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text);
  background:
    radial-gradient(1100px 640px at 84% -12%, rgba(200, 224, 244, 0.11), transparent 62%),
    radial-gradient(820px 560px at -6% 108%, rgba(245, 224, 232, 0.09), transparent 58%),
    var(--ink);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--ice); text-decoration: none; }
a:hover { color: var(--rose); }

:focus-visible {
  outline: 2px solid var(--rose);
  outline-offset: 3px;
}

.shell {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 34px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 26px 24px 0;
}

/* 左侧凹槽目录 */
.rail {
  position: sticky;
  top: 22px;
  align-self: start;
  padding: 18px 14px 20px;
  border-radius: 22px;
  background: linear-gradient(150deg, #19222a, #141b21);
  box-shadow: var(--sink);
}

.rail-tag {
  margin: 0 0 12px;
  font-size: 0.82rem;
  letter-spacing: 0.22em;
  color: var(--rose);
}

.rail nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.rail nav a {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 14px;
  border-radius: var(--r-sm);
  font-size: 0.95rem;
  color: #c3d5e3;
  background: linear-gradient(145deg, #1e2831, #161e25);
  box-shadow: 5px 5px 14px rgba(0, 0, 0, 0.45), -4px -4px 12px rgba(150, 190, 215, 0.06);
}

.rail nav a:hover {
  color: var(--ink);
  background: linear-gradient(145deg, #d9ecfa, #bcd6ea);
}

.rail nav a:active {
  box-shadow: inset 4px 4px 10px rgba(0, 0, 0, 0.35), inset -3px -3px 9px rgba(255, 255, 255, 0.55);
}

.rail-note {
  margin: 16px 0 0;
  padding-left: 12px;
  border-left: 2px solid rgba(245, 224, 232, 0.3);
  font-size: 0.86rem;
  line-height: 1.7;
  color: #8ea5b5;
}

.main { min-width: 0; }

/* 首屏 */
.hero {
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 30px;
  min-height: 100vh;
  padding: 9vh 0 40px;
}

.hero-ghost {
  position: absolute;
  top: 4%;
  right: -3%;
  z-index: 0;
  font-family: 'EB Garamond', serif;
  font-weight: 800;
  font-size: clamp(7rem, 25vw, 19rem);
  line-height: 0.8;
  letter-spacing: -0.05em;
  color: rgba(200, 224, 244, 0.055);
  pointer-events: none;
  user-select: none;
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero-kicker {
  display: block;
  margin-bottom: 14px;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--rose);
}

.hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 6vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: #f0f7fc;
}

.hero-lead {
  margin: 0;
  max-width: 34em;
  font-size: 1.1rem;
  color: #c2d4e1;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: var(--r-md);
  font-size: 1rem;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.btn-main {
  background: linear-gradient(145deg, #dcefff, #b3d1e9);
  color: #16202a;
  box-shadow: var(--lift);
}

.btn-main:hover { color: #16202a; }

.btn-soft {
  background: linear-gradient(145deg, #232e38, #182128);
  color: #dbe7f1;
  box-shadow: var(--lift);
}

.btn:active { transform: scale(0.97); box-shadow: var(--sink); }

.rotor {
  position: relative;
  min-height: 3.6em;
  margin-top: 26px;
}

.rotor p {
  position: absolute;
  inset: 0;
  margin: 0;
  padding-left: 13px;
  border-left: 3px solid rgba(200, 224, 244, 0.28);
  font-size: 0.97rem;
  line-height: 1.6;
  color: #9db1c0;
  opacity: 0;
  animation: rotor 15s infinite;
}

.rotor p:nth-child(2) { animation-delay: 5s; }
.rotor p:nth-child(3) { animation-delay: 10s; }

@keyframes rotor {
  0% { opacity: 1; }
  31% { opacity: 1; }
  34% { opacity: 0; }
  100% { opacity: 0; }
}

.hero-figure {
  position: relative;
  z-index: 1;
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--lift-hard);
}

.hero-figure img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vh, 300px);
  object-fit: cover;
}

.hero-figure figcaption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  padding: 6px 12px;
  border-radius: var(--r-sm);
  background: rgba(23, 31, 38, 0.68);
  font-size: 0.85rem;
  color: #e9f2f9;
}

.wrap { padding-bottom: 24px; }

/* 正文凹槽面板 + 凸起卡片 */
.paper {
  border-radius: 32px;
  padding: clamp(18px, 3vw, 34px);
  background: linear-gradient(150deg, #19222a, #141c22);
  box-shadow: var(--sink);
}

.paper-kicker {
  display: block;
  margin-bottom: 8px;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  color: var(--rose);
}

.paper h2 {
  margin: 0 0 20px;
  font-size: clamp(1.45rem, 3.4vw, 2rem);
  line-height: 1.3;
  color: #eaf2f8;
}

.content > article {
  margin-bottom: 20px;
  padding: clamp(18px, 2.6vw, 28px);
  border-radius: var(--r-lg);
  background: linear-gradient(145deg, #1f2932, #161e25);
  box-shadow: var(--lift);
  scroll-margin-top: 22px;
}

.content > article:last-child { margin-bottom: 0; }

.content > article:target {
  box-shadow: var(--lift-hard), 0 0 0 1px rgba(245, 224, 232, 0.18);
}

.content h2 {
  margin: 0 0 0.55em;
  font-size: clamp(1.32rem, 2.8vw, 1.72rem);
  line-height: 1.35;
  color: #eef5fa;
}

.content h3 {
  margin: 1.5em 0 0.4em;
  font-size: 1.14rem;
  color: #e6f0f7;
}

.content p {
  margin: 0.85em 0;
  line-height: 1.92;
  color: #d7e3ed;
}

.content a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(200, 224, 244, 0.45);
}

.content a:hover { color: var(--rose); }

.content ul,
.content ol {
  margin: 0.9em 0;
  padding-left: 1.35em;
  line-height: 1.9;
  color: #d7e3ed;
}

.content li { margin: 0.4em 0; }

.content strong { color: #f3f9fd; }

.content img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 18px 0;
  border-radius: 20px;
  box-shadow: var(--lift);
}

.content blockquote {
  margin: 18px 0;
  padding: 14px 20px;
  border-radius: 20px;
  box-shadow: var(--sink);
  color: #c9d8e4;
}

.content blockquote p { margin: 0.35em 0; }

.content pre {
  overflow-x: auto;
  padding: 14px 18px;
  border-radius: var(--r-md);
  box-shadow: var(--sink);
  font-size: 0.95rem;
}

.content code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: 0.94em;
}

/* 页脚 */
.foot {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 14px 32px;
  align-items: start;
  max-width: 1180px;
  margin: 48px auto 0;
  padding: 0 24px 22px;
}

.foot-brand {
  grid-column: 1;
  margin: 0;
  font-family: 'EB Garamond', serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 10vw, 5.6rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: transparent;
  background: linear-gradient(120deg, #d9ecfa, #f7e4ec);
  -webkit-background-clip: text;
  background-clip: text;
}

.foot-desc {
  grid-column: 1;
  margin: 0;
  max-width: 32ch;
  font-size: 0.98rem;
  color: #9db2c1;
}

.foot-links {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: end;
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
}

.foot-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 1rem;
  color: #cfe0ee;
}

.foot small {
  grid-column: 1 / -1;
  padding-top: 12px;
  font-size: 0.85rem;
  color: #7e94a4;
}

/* 底部固定条 */
.dock {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 60;
  padding: 10px 14px calc(12px + env(safe-area-inset-bottom));
  border-radius: 26px 26px 0 0;
  background: linear-gradient(160deg, #1d272f, #141c22);
  box-shadow: 0 -14px 34px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(220, 235, 245, 0.07);
  backdrop-filter: blur(4px);
}

.dock-top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin-bottom: 6px;
}

.dock-brand {
  padding: 10px 16px;
  font-size: 1.05rem;
  letter-spacing: 0.08em;
  color: #eef5fa;
}

.dock-cta {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: var(--r-sm);
  background: linear-gradient(145deg, #f9ecf2, #ecd5df);
  color: #241a20;
  font-size: 0.95rem;
  box-shadow: 6px 6px 16px rgba(0, 0, 0, 0.5), -4px -4px 12px rgba(245, 224, 232, 0.12);
  transition: transform 150ms ease;
}

.dock-cta:hover { color: #241a20; }

.dock-cta:active {
  transform: translateY(-50%) scale(0.97);
  box-shadow: inset 4px 4px 10px rgba(0, 0, 0, 0.22), inset -3px -3px 9px rgba(255, 255, 255, 0.7);
}

.dock-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
}

.dock-nav a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 12px;
  border-radius: var(--r-sm);
  font-size: 0.95rem;
  color: #cfe0ee;
  background: linear-gradient(145deg, #232e37, #1a232a);
  box-shadow: 5px 5px 13px rgba(0, 0, 0, 0.45), -4px -4px 11px rgba(150, 190, 215, 0.06);
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.dock-nav a:hover,
.dock-nav a[aria-current='true'] {
  color: var(--ink);
  background: linear-gradient(145deg, #d5e9f8, #b8d3e8);
}

.dock-nav a:active {
  transform: scale(0.97);
  box-shadow: inset 4px 4px 10px rgba(0, 0, 0, 0.45), inset -3px -3px 9px rgba(255, 255, 255, 0.28);
}

@media (max-width: 900px) {
  .shell {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
    padding-top: 18px;
  }

  .rail {
    position: static;
    padding: 14px;
  }

  .rail nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 7px;
  }

  .rail nav a {
    min-height: 40px;
    padding: 6px 12px;
    font-size: 0.92rem;
  }

  .rail-note { display: none; }

  .hero {
    min-height: auto;
    padding: 6vh 0 28px;
  }
}

@media (max-width: 760px) {
  body { padding-bottom: 196px; }

  .foot {
    grid-template-columns: minmax(0, 1fr);
    margin-top: 34px;
  }

  .foot-links {
    grid-column: 1;
    grid-row: auto;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0 20px;
  }

  .foot small { grid-column: 1; }
}

@media (max-width: 420px) {
  body { font-size: 16.5px; }

  .dock-nav a {
    padding: 0 10px;
    font-size: 0.92rem;
  }

  .hero-actions .btn {
    padding: 0 16px;
    font-size: 0.96rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  .rotor { min-height: 0; }

  .rotor p {
    position: static;
    opacity: 1;
    margin-bottom: 8px;
    animation: none;
  }

  .btn,
  .dock-cta,
  .dock-nav a { transition: none; }
}

button[aria-expanded]{min-width:44px;min-height:44px}