/* ============================================================
   The AI Atlas — 亮色设计系统 v2
   柔和光晕 · 玻璃白卡 · 渐变强调 · 灵动微交互
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --bg-0: #f4f6fc;
  --bg-1: #ffffff;
  --bg-2: #eef1f9;
  --bg-3: #e6eaf6;
  --card: rgba(255, 255, 255, .85);
  --card-solid: #ffffff;
  --line: rgba(15, 23, 42, .10);
  --line-strong: rgba(15, 23, 42, .22);
  --text: #101828;
  --muted: #475467;
  --faint: #7a8699;
  --cyan: #0891b2;
  --violet: #7c3aed;
  --magenta: #db2777;
  --green: #059669;
  --amber: #d97706;
  --red: #dc2626;
  --grad: linear-gradient(115deg, #06b6d4 0%, #8b5cf6 52%, #ec4899 100%);
  --grad-soft: linear-gradient(115deg, rgba(6,182,212,.10), rgba(139,92,246,.10) 52%, rgba(236,72,153,.08));
  --radius: 16px;
  --radius-lg: 24px;
  --font-display: "Space Grotesk", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --ease-out: cubic-bezier(.22, .8, .26, 1);
  --ease-pop: cubic-bezier(.3, 1.5, .45, 1);
  --ease-spring: cubic-bezier(.34, 1.56, .64, 1);
  --shadow-card: 0 20px 50px -22px rgba(30, 41, 82, .28);
  --shadow-soft: 0 8px 30px -12px rgba(30, 41, 82, .16);
  --nav-h: 68px;
}

/* ---------- 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; overflow-x: hidden; overflow-x: clip; }
body {
  background: var(--bg-0);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--violet); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
::selection { background: rgba(139, 92, 246, .25); color: var(--text); }

/* 滚动条 */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--bg-2); }
::-webkit-scrollbar-thumb { background: linear-gradient(180deg, #c7d2ec, #a9b6dd); border-radius: 8px; border: 2px solid var(--bg-2); }
::-webkit-scrollbar-thumb:hover { background: linear-gradient(180deg, #a9b6dd, #8a9ac6); }

/* ---------- 背景层:粒子画布 + 柔光光晕 ---------- */
#starfield {
  position: fixed; inset: 0; z-index: 0;
  pointer-events: none;
}
.aurora {
  position: fixed; z-index: 0; pointer-events: none;
  border-radius: 50%;
  filter: blur(110px);
  opacity: .5;
  will-change: transform;
}
.aurora-a {
  width: 620px; height: 620px; top: -220px; left: -140px;
  background: radial-gradient(circle at 35% 35%, rgba(6, 182, 212, .20), transparent 65%);
  animation: drift-a 26s ease-in-out infinite alternate;
}
.aurora-b {
  width: 700px; height: 700px; top: 6%; right: -240px;
  background: radial-gradient(circle at 60% 40%, rgba(139, 92, 246, .18), transparent 65%);
  animation: drift-b 32s ease-in-out infinite alternate;
}
.aurora-c {
  width: 560px; height: 560px; bottom: -240px; left: 28%;
  background: radial-gradient(circle at 50% 55%, rgba(236, 72, 153, .13), transparent 62%);
  animation: drift-c 38s ease-in-out infinite alternate;
}
@keyframes drift-a { to { transform: translate(90px, 70px) scale(1.12); } }
@keyframes drift-b { to { transform: translate(-110px, 60px) scale(1.06); } }
@keyframes drift-c { to { transform: translate(70px, -90px) scale(1.16); } }

/* 网格底纹 */
.grid-overlay {
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(rgba(15, 23, 42, .045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 23, 42, .045) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 78%);
}

/* ---------- 布局工具 ---------- */
.container { width: min(1160px, 92%); margin-inline: auto; position: relative; z-index: 1; }
.section { padding-block: 88px; position: relative; }
.section-tight { padding-block: 48px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display); font-size: .78rem; font-weight: 600;
  letter-spacing: .22em; text-transform: uppercase; color: var(--violet);
  margin-bottom: 14px;
}
.eyebrow::before { content: ""; width: 26px; height: 1px; background: var(--grad); }
.h1, .h2, .h3, .h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.16; letter-spacing: -.01em; }
.h1 { font-size: clamp(2.5rem, 6vw, 4.3rem); }
.h2 { font-size: clamp(1.9rem, 4vw, 2.7rem); }
.h3 { font-size: clamp(1.2rem, 2.4vw, 1.45rem); }
.lead { font-size: clamp(1.05rem, 1.8vw, 1.22rem); color: var(--muted); }
.grad-text {
  background: var(--grad);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  background-size: 220% 220%;
  animation: grad-shift 7s ease-in-out infinite;
}
@keyframes grad-shift { 0%, 100% { background-position: 0% 50%; } 50% { background-position: 100% 50%; } }
.muted { color: var(--muted); }
.faint { color: var(--faint); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  padding: 13px 26px; border-radius: 999px;
  font-family: var(--font-display); font-weight: 600; font-size: .95rem;
  border: 1px solid transparent; cursor: pointer;
  transition: transform .25s var(--ease-pop), box-shadow .3s, border-color .3s, background .3s;
  will-change: transform;
}
.btn-primary {
  color: #fff;
  background: var(--grad); background-size: 200% 200%;
  box-shadow: 0 10px 34px -10px rgba(139, 92, 246, .55);
  animation: grad-shift 7s ease-in-out infinite;
}
.btn-primary:hover { transform: translateY(-2px) scale(1.03); box-shadow: 0 16px 44px -10px rgba(6, 182, 212, .5); text-decoration: none; }
.btn-ghost { color: var(--text); border-color: var(--line-strong); background: rgba(255, 255, 255, .75); backdrop-filter: blur(8px); }
.btn-ghost:hover { border-color: var(--violet); color: var(--violet); transform: translateY(-2px); text-decoration: none; box-shadow: 0 10px 30px -12px rgba(139, 92, 246, .35); }
.btn-sm { padding: 9px 18px; font-size: .85rem; }

/* ---------- 头部导航(白条分层) ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 90;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 4px 24px -12px rgba(30, 41, 82, .18);
  transition: box-shadow .3s;
}
.site-header.scrolled { box-shadow: 0 10px 34px -14px rgba(30, 41, 82, .28); }
.nav-inner { display: flex; align-items: center; gap: 26px; height: 100%; }
.brand { display: flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 700; font-size: 1.12rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 10px;
  background: var(--grad);
  display: grid; place-items: center;
  color: #fff; font-weight: 800; font-size: 1rem;
  box-shadow: 0 4px 16px -4px rgba(139, 92, 246, .55);
  animation: mark-glow 4s ease-in-out infinite;
}
@keyframes mark-glow { 0%, 100% { box-shadow: 0 4px 14px -4px rgba(139, 92, 246, .45); } 50% { box-shadow: 0 6px 26px -4px rgba(6, 182, 212, .6); } }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--muted); font-size: .93rem; font-weight: 500;
  padding: 9px 13px; border-radius: 10px;
  transition: color .25s, background .25s;
}
.nav-links a:hover { color: var(--text); background: rgba(15, 23, 42, .06); text-decoration: none; }
.nav-links a.active { color: var(--violet); background: rgba(139, 92, 246, .10); }
.nav-cta { margin-left: 8px; color: #fff !important; }
.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: 10px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--text); margin: 5px 0; border-radius: 2px; transition: transform .3s, opacity .3s; }
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 阅读进度条 */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; z-index: 100;
  background: var(--grad);
  width: 0%;
  box-shadow: 0 0 12px rgba(139, 92, 246, .5);
  transition: width .08s linear;
}

/* ---------- Hero(柔和色带,与白导航分层) ---------- */
.hero {
  padding-top: calc(var(--nav-h) + 96px); padding-bottom: 96px;
  position: relative;
  background: linear-gradient(180deg, #e9eefb 0%, rgba(233, 238, 251, 0) 100%);
}
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 56px; align-items: center; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px; border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, .8);
  font-size: .82rem; color: var(--muted);
  backdrop-filter: blur(8px);
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px rgba(5, 150, 105, .7); animation: pulse-dot 2s ease-in-out infinite; }
@keyframes pulse-dot { 0%, 100% { opacity: 1; } 50% { opacity: .35; } }
.hero h1 { margin: 22px 0 18px; }
.typewriter-wrap { min-height: 1.5em; color: var(--muted); font-size: clamp(1.15rem, 2.6vw, 1.6rem); font-family: var(--font-display); }
.typewriter-cursor { display: inline-block; width: 3px; height: 1.15em; background: var(--violet); margin-left: 5px; vertical-align: -0.18em; animation: blink 1s steps(1) infinite; box-shadow: 0 0 10px rgba(139, 92, 246, .6); }
@keyframes blink { 50% { opacity: 0; } }
.hero-actions { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 32px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 26px; margin-top: 40px; }
.hero-meta .stat b { display: block; font-family: var(--font-display); font-size: 1.5rem; }
.hero-meta .stat span { font-size: .8rem; color: var(--faint); letter-spacing: .08em; text-transform: uppercase; }

/* 右侧视觉:浮动的"地图卡片" */
.hero-visual { position: relative; min-height: 430px; }
.orbit-ring {
  position: absolute; inset: 0; margin: auto;
  width: 340px; height: 340px; border-radius: 50%;
  border: 1px dashed rgba(15, 23, 42, .2);
  animation: spin 46s linear infinite;
}
.orbit-ring.r2 { width: 440px; height: 440px; border-color: rgba(6, 182, 212, .25); animation-duration: 70s; animation-direction: reverse; }
.orbit-core {
  position: absolute; inset: 0; margin: auto;
  width: 150px; height: 150px; border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, rgba(6,182,212,.85), rgba(139,92,246,.75) 55%, rgba(236,72,153,.65));
  filter: blur(.5px);
  box-shadow: 0 10px 50px -6px rgba(139, 92, 246, .5), inset 0 0 34px rgba(255,255,255,.35);
  animation: core-breathe 5s ease-in-out infinite;
  display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; letter-spacing: .1em; color: #fff;
}
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes core-breathe { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.07); } }
.orbit-node {
  position: absolute; width: 54px; height: 54px; border-radius: 16px;
  background: rgba(255, 255, 255, .92); border: 1px solid var(--line-strong);
  display: grid; place-items: center; font-size: 1.35rem;
  box-shadow: var(--shadow-soft);
  animation: float-y 6s ease-in-out infinite;
  transition: transform .3s var(--ease-pop), border-color .3s;
}
.orbit-node:hover { transform: scale(1.14); border-color: var(--cyan); }
.orbit-node.n1 { top: 4%; left: 10%; animation-delay: -.8s; }
.orbit-node.n2 { top: 16%; right: 2%; animation-delay: -2.4s; }
.orbit-node.n3 { bottom: 8%; left: 6%; animation-delay: -3.9s; }
.orbit-node.n4 { bottom: 18%; right: 12%; animation-delay: -1.5s; }
.orbit-node.n5 { top: 44%; left: -2%; animation-delay: -4.6s; }
@keyframes float-y { 0%, 100% { translate: 0 0; } 50% { translate: 0 -12px; } }
.hero-float-card {
  position: absolute; bottom: -6px; right: 4%;
  background: var(--card); border: 1px solid var(--line);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius);
  padding: 16px 20px;
  font-size: .86rem; color: var(--muted);
  box-shadow: var(--shadow-card);
  animation: float-y 7s ease-in-out infinite;
}
.hero-float-card b { color: var(--text); font-family: var(--font-display); }

/* ---------- 跑马灯 ---------- */
.marquee { overflow: hidden; border-block: 1px solid var(--line); background: rgba(255, 255, 255, .7); padding-block: 18px; position: relative; z-index: 1; }
.marquee-track { display: flex; gap: 44px; width: max-content; animation: marquee 36s linear infinite; }
.marquee:hover .marquee-track { animation-play-state: paused; }
.marquee-item { display: flex; align-items: center; gap: 10px; color: var(--muted); font-family: var(--font-display); font-weight: 600; font-size: .95rem; white-space: nowrap; }
.marquee-item i { color: var(--violet); font-style: normal; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ---------- 卡片 ---------- */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }
.card {
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 28px;
  overflow: hidden;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 4px 18px -12px rgba(30, 41, 82, .12);
  transition: transform .35s var(--ease-out), border-color .35s, box-shadow .35s, background .35s;
  transform-style: preserve-3d;
  will-change: transform;
}
.card::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(560px circle at var(--mx, 50%) var(--my, 50%), rgba(139, 92, 246, .12), transparent 45%);
  opacity: 0; transition: opacity .35s;
  pointer-events: none;
}
.card:hover { border-color: var(--line-strong); box-shadow: var(--shadow-card); }
.card:hover::before { opacity: 1; }
.card-icon {
  width: 46px; height: 46px; border-radius: 13px;
  display: grid; place-items: center; font-size: 1.3rem;
  background: var(--grad-soft);
  border: 1px solid var(--line-strong);
  margin-bottom: 16px;
}
.card h3 { margin-bottom: 10px; }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--violet); text-decoration: none; }
.card p { color: var(--muted); font-size: .94rem; margin-bottom: 16px; }
.card-link { font-family: var(--font-display); font-weight: 600; font-size: .88rem; display: inline-flex; align-items: center; gap: 7px; }
.card-link .arr { transition: transform .3s var(--ease-pop); }
.card:hover .card-link .arr { transform: translateX(5px); }
.card-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chip {
  font-size: .74rem; padding: 4px 11px; border-radius: 999px;
  border: 1px solid var(--line-strong);
  color: var(--muted); background: rgba(255, 255, 255, .7);
  transition: color .25s, border-color .25s, transform .25s var(--ease-pop);
}
a.chip:hover { color: var(--violet); border-color: var(--violet); text-decoration: none; transform: translateY(-2px); }

/* 特性行 */
.feature-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.feature {
  display: flex; gap: 15px; align-items: flex-start;
  padding: 20px; border-radius: var(--radius);
  border: 1px solid transparent;
  transition: background .3s, border-color .3s, transform .3s var(--ease-out);
}
.feature:hover { background: var(--card); border-color: var(--line); transform: translateY(-4px); }
.feature .f-ico { font-size: 1.4rem; width: 44px; height: 44px; flex: 0 0 44px; display: grid; place-items: center; border-radius: 12px; background: var(--grad-soft); border: 1px solid var(--line); }
.feature h3, .feature h4 { font-family: var(--font-display); font-size: 1.02rem; margin-bottom: 5px; }
.feature p { font-size: .9rem; color: var(--muted); }

/* ---------- 数字统计 ---------- */
.stats-band { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 20px; }
.stat-box {
  text-align: center; padding: 30px 16px;
  border-radius: var(--radius-lg);
  background: var(--card); border: 1px solid var(--line);
  box-shadow: 0 4px 18px -12px rgba(30, 41, 82, .12);
  position: relative; overflow: hidden;
}
.stat-box::after {
  content: ""; position: absolute; left: 50%; bottom: 0; transform: translateX(-50%);
  width: 56px; height: 3px; border-radius: 3px;
  background: var(--grad);
}
.stat-num { font-family: var(--font-display); font-weight: 700; font-size: clamp(1.9rem, 4vw, 2.6rem); }
.stat-label { font-size: .82rem; color: var(--muted); margin-top: 6px; letter-spacing: .05em; }

/* ---------- 表格(对比) ---------- */
.table-wrap { overflow-x: auto; max-width: 100%; border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--card); box-shadow: 0 4px 18px -12px rgba(30, 41, 82, .12); }
table.compare { width: 100%; border-collapse: collapse; min-width: 640px; font-size: .92rem; }
table.compare th, table.compare td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); }
table.compare thead th {
  font-family: var(--font-display); font-weight: 600; color: var(--text);
  background: rgba(238, 241, 249, .92); position: sticky; top: 0;
  backdrop-filter: blur(8px);
}
table.compare tbody tr { transition: background .25s; }
table.compare tbody tr:hover { background: rgba(139, 92, 246, .05); }
table.compare tbody tr:last-child td { border-bottom: 0; }
table.compare td:first-child { font-weight: 600; color: var(--text); }

/* ---------- 手风琴 FAQ ---------- */
.accordion { display: grid; gap: 14px; }
.acc-item { border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); overflow: hidden; transition: border-color .3s; }
.acc-item[open] { border-color: var(--line-strong); }
.acc-head {
  width: 100%; text-align: left; background: none; border: 0; cursor: pointer;
  color: var(--text); font-family: var(--font-display); font-weight: 600; font-size: 1rem;
  padding: 18px 22px;
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
}
.acc-head { list-style: none; }
.acc-head::-webkit-details-marker { display: none; }
.acc-head .acc-ico { flex: 0 0 auto; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--line-strong); display: grid; place-items: center; font-size: .9rem; color: var(--violet); transition: transform .35s var(--ease-pop), background .3s; }
.acc-item[open] .acc-ico { transform: rotate(45deg); background: rgba(139, 92, 246, .10); }
.acc-body-inner { padding: 0 22px 20px; color: var(--muted); font-size: .95rem; }

/* ---------- 文章页 ---------- */
.article-hero {
  padding-top: calc(var(--nav-h) + 70px); padding-bottom: 46px;
  background: linear-gradient(180deg, #e9eefb 0%, rgba(233, 238, 251, 0) 100%);
}
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: .82rem; color: var(--faint); margin-bottom: 22px; }
.breadcrumbs a { color: var(--muted); }
.article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; margin-top: 20px; font-size: .86rem; color: var(--muted); }
.article-meta .sep { color: var(--faint); }
.byline { display: flex; align-items: center; gap: 11px; }
.avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: var(--grad); display: grid; place-items: center;
  font-family: var(--font-display); font-weight: 700; font-size: .85rem; color: #fff;
}
.article-body { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 48px; align-items: start; }
.toc { position: sticky; top: calc(var(--nav-h) + 24px); font-size: .88rem; }
.toc-title { font-family: var(--font-display); font-weight: 600; font-size: .78rem; letter-spacing: .16em; text-transform: uppercase; color: var(--faint); margin-bottom: 12px; }
.toc ul { list-style: none; display: grid; gap: 2px; border-left: 1px solid var(--line); }
.toc a { display: block; padding: 7px 14px; color: var(--muted); border-left: 2px solid transparent; margin-left: -1px; transition: color .25s, border-color .25s; }
.toc a:hover { color: var(--text); text-decoration: none; }
.toc a.active { color: var(--violet); border-left-color: var(--violet); }
.prose { font-size: 1.02rem; color: #2a3648; }
.prose h2 { font-family: var(--font-display); font-size: 1.7rem; font-weight: 700; color: var(--text); margin: 52px 0 18px; letter-spacing: -.01em; }
.prose h2:first-child { margin-top: 8px; }
.prose h3 { font-family: var(--font-display); font-size: 1.22rem; font-weight: 600; color: var(--text); margin: 36px 0 14px; }
.prose p { margin-bottom: 18px; }
.prose ul, .prose ol { margin: 0 0 18px 24px; display: grid; gap: 8px; }
.prose a { border-bottom: 1px solid rgba(139, 92, 246, .35); color: var(--violet); }
.prose a:hover { border-bottom-color: var(--violet); text-decoration: none; }
.prose strong { color: var(--text); }
.prose blockquote {
  margin: 26px 0; padding: 20px 24px;
  border-left: 3px solid;
  border-image: var(--grad) 1;
  background: var(--grad-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--muted); font-size: .98rem;
}
.prose .stat-callout {
  margin: 26px 0; padding: 22px 26px;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: 0 4px 18px -12px rgba(30, 41, 82, .12);
  display: flex; gap: 18px; align-items: center; flex-wrap: wrap;
}
.prose .stat-callout b { font-family: var(--font-display); font-size: 2rem; color: var(--text); display: block; line-height: 1.1; }
.prose .stat-callout span { font-size: .85rem; color: var(--muted); }
.prose .source-note { font-size: .82rem; color: #57677e; margin-top: -10px; margin-bottom: 18px; }
.sources {
  margin-top: 44px; padding: 26px 28px;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: var(--card);
}
.sources h3 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 14px; }
.sources ol { margin-left: 20px; display: grid; gap: 7px; font-size: .88rem; color: var(--muted); }
.sources a { word-break: break-all; }
.share-note { margin-top: 18px; font-size: .8rem; color: var(--faint); }
.next-articles { margin-top: 60px; }

/* ---------- CTA / 订阅 ---------- */
.cta-band {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(6, 182, 212, .10), rgba(139, 92, 246, .12) 50%, rgba(236, 72, 153, .08));
  padding: 52px 44px;
  text-align: center;
  position: relative; overflow: hidden;
}
.cta-band::before {
  content: ""; position: absolute; inset: -60% -20%;
  background: conic-gradient(from 0deg, transparent 0 70%, rgba(139, 92, 246, .12) 82%, transparent 92%);
  animation: spin 14s linear infinite;
}
.cta-band > * { position: relative; }
.cta-band h2 { margin-bottom: 12px; }
.cta-band p { color: var(--muted); max-width: 620px; margin: 0 auto 26px; }
/* ---------- 页脚 ---------- */
.site-footer { border-top: 1px solid var(--line); background: rgba(255, 255, 255, .85); margin-top: 90px; position: relative; z-index: 1; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 36px; padding-block: 54px 40px; }
.footer-grid h3, .footer-grid h4 { font-family: var(--font-display); font-size: .82rem; letter-spacing: .14em; text-transform: uppercase; color: #57677e; margin-bottom: 16px; }
.footer-grid ul { list-style: none; display: grid; gap: 9px; font-size: .9rem; }
.footer-grid a { color: var(--muted); }
.footer-grid a:hover { color: var(--violet); text-decoration: none; }
.footer-brand p { color: var(--muted); font-size: .88rem; margin-top: 12px; max-width: 300px; }
.footer-bottom { border-top: 1px solid var(--line); padding-block: 18px; font-size: .8rem; color: #57677e; display: flex; flex-wrap: wrap; gap: 14px; justify-content: space-between; }

/* ---------- 杂项 ---------- */
.back-top {
  position: fixed; right: 26px; bottom: 26px; z-index: 80;
  width: 46px; height: 46px; border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, .9); color: var(--violet);
  cursor: pointer; font-size: 1.05rem;
  backdrop-filter: blur(10px);
  opacity: 0; transform: translateY(14px); pointer-events: none;
  transition: opacity .3s, transform .3s var(--ease-pop), box-shadow .3s;
}
.back-top.show { opacity: 1; transform: none; pointer-events: auto; }
.back-top:hover { box-shadow: 0 0 24px rgba(139, 92, 246, .4); }

/* 滚动显现:仅当 JS 可用时才隐藏,预览/无 JS 环境直接可见 */
.js .reveal { opacity: 0; transform: translateY(26px); filter: blur(4px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out), filter .7s var(--ease-out); }
.js .reveal.in { opacity: 1; transform: none; filter: none; }
.js .reveal[data-delay="1"] { transition-delay: .08s; }
.js .reveal[data-delay="2"] { transition-delay: .16s; }
.js .reveal[data-delay="3"] { transition-delay: .24s; }
.js .reveal[data-delay="4"] { transition-delay: .32s; }
.js .reveal[data-delay="5"] { transition-delay: .4s; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; gap: 30px; }
  .hero-visual { min-height: 360px; max-width: 480px; margin-inline: auto; }
  .article-body { grid-template-columns: 1fr; }
  .article-body > * { min-width: 0; }
  .toc { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 760px) {
  .section { padding-block: 62px; }
  .nav-links {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    background: rgba(255, 255, 255, .97); backdrop-filter: blur(18px);
    padding: 18px 6vw 26px;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 20px 40px -20px rgba(30, 41, 82, .25);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: opacity .3s, transform .3s;
  }
  .nav-links.open { opacity: 1; transform: none; pointer-events: auto; }
  .nav-links a { padding: 13px 14px; font-size: 1rem; }
  .nav-cta { margin-left: 0; }
  .nav-toggle { display: block; margin-left: auto; }
  .footer-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 38px 22px; }
}

/* ---------- 无障碍:减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001s !important;
  }
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; filter: none; }
  #starfield, .aurora { display: none; }
}