/* ============================================================
   全人星球 AI 课 · 全站样式
   纯静态站，零 JS：导航与 FAQ 均用 <details> 实现
   ============================================================ */

/* ---------- design tokens ---------- */
:root {
  /* 色板：深空蓝 + 暖橙 accent + 米白纸面 */
  --space-950: #070B1D;
  --space-900: #0B1026;
  --space-800: #131A3A;
  --space-700: #1D2650;
  --accent: #E85D26;
  --accent-bright: #FF7A3D;
  --accent-deep: #C24415;
  --sun: #FFC24B;

  --paper: #FBFAF7;
  --paper-dim: #F3F0E9;
  --ink: #22263A;
  --ink-soft: #565C74;
  --line: #E4E0D6;

  --ok: #2E7D5B;
  --bad: #B0483A;

  /* 字号（移动优先，clamp 弹性） */
  --fs-hero: clamp(1.9rem, 5.2vw, 3.4rem);
  --fs-h2: clamp(1.45rem, 3.4vw, 2.15rem);
  --fs-h3: clamp(1.15rem, 2.4vw, 1.35rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;

  /* 间距与形状 */
  --sp-section: clamp(3.5rem, 8vw, 6rem);
  --sp-block: clamp(1.5rem, 3.5vw, 2.25rem);
  --radius: 18px;
  --radius-sm: 10px;
  --maxw: 1120px;

  /* 阴影（双层：贴地 + 扩散） */
  --shadow-card: 0 1px 2px rgba(34, 38, 58, 0.04), 0 10px 28px rgba(34, 38, 58, 0.07);
  --shadow-card-hover: 0 2px 4px rgba(34, 38, 58, 0.05), 0 18px 44px rgba(34, 38, 58, 0.12);

  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Segoe UI", sans-serif;
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

/* 占位内容隐藏（恢复时去掉 hidden 属性即可；!important 防止被 .btn 等 display 规则覆盖） */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

::selection { background: var(--accent); color: #fff; }
:focus-visible { outline: 2px solid var(--accent-bright); outline-offset: 3px; border-radius: 4px; }

h1, h2, h3, h4 { letter-spacing: 0.01em; text-wrap: balance; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--accent-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--accent); }

h1, h2, h3, h4 { line-height: 1.3; color: var(--ink); margin: 0 0 0.6em; font-weight: 700; }
h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
p { margin: 0 0 1em; }

ul, ol { padding-left: 1.4em; margin: 0 0 1em; }
li { margin-bottom: 0.4em; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* 眉题 */
.kicker {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--accent-deep);
  margin-bottom: 0.8em;
}
.kicker::before {
  content: "";
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 0.6em;
  vertical-align: 1px;
}

/* 段落容器 */
.section { padding: var(--sp-section) 0; }
.section-tight { padding: calc(var(--sp-section) * 0.7) 0; }
.section-alt { background: var(--paper-dim); }
/* 问题区分区：浅蓝灰底，与米白形成节奏 */
.section-slate { background: #EEF0F6; }
.section-head { max-width: 44em; margin-bottom: var(--sp-block); }

/* 深色区文字 */
.on-dark { color: rgba(255, 255, 255, 0.86); }
.on-dark h1, .on-dark h2, .on-dark h3 { color: #fff; }
.on-dark a { color: var(--sun); }
.on-dark .kicker { color: var(--sun); }
.on-dark .kicker::before { background: var(--sun); }

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 16, 38, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 62px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  text-decoration: none;
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}
.brand:hover { color: #fff; }
.brand-planet {
  width: 26px; height: 26px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, var(--sun), var(--accent) 55%, var(--accent-deep));
  box-shadow: 0 0 0 3px rgba(232, 93, 38, 0.25), 0 2px 10px rgba(232, 93, 38, 0.5);
  flex: none;
}
.nav-desktop { display: none; }
.nav-desktop ul { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; }
.nav-desktop a { color: rgba(255, 255, 255, 0.82); text-decoration: none; font-size: 0.95rem; }
.nav-desktop a:hover { color: #fff; }
.nav-desktop .nav-cta {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.32);
  color: #fff;
  padding: 8px 20px;
  border-radius: 999px;
  font-weight: 600;
}
.nav-desktop .nav-cta:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.55);
  color: #fff;
}

/* 当前页高亮（菜单全站保持同一组项，不随页面增删） */
.nav-desktop a[aria-current="page"] { color: #fff; }
.nav-desktop li { position: relative; }
.nav-desktop a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}
.nav-mobile a[aria-current="page"] { color: var(--sun); }

/* 移动端导航：<details> 零 JS 实现 */
.nav-mobile { position: relative; }
.nav-mobile summary {
  list-style: none;
  cursor: pointer;
  color: #fff;
  font-size: 0.95rem;
  padding: 8px 0 8px 4px;
  user-select: none;
}
.nav-mobile summary::-webkit-details-marker { display: none; }
.nav-mobile summary::after { content: " ▾"; font-size: 0.7em; }
.nav-mobile[open] summary::after { content: " ▴"; }
.nav-mobile ul {
  position: absolute;
  right: 0;
  top: calc(100% + 10px);
  list-style: none;
  margin: 0;
  padding: 10px 22px;
  background: var(--space-900);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  min-width: 180px;
}
.nav-mobile li { margin: 0; }
.nav-mobile a {
  display: block;
  padding: 9px 0;
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  white-space: nowrap;
}
.nav-mobile a:hover, .nav-mobile a:focus { color: var(--sun); }

@media (min-width: 800px) {
  .nav-desktop { display: block; }
  .nav-mobile { display: none; }
}

/* ---------- 按钮（CTA 双位：直接醒目 / 过渡更暗） ---------- */
.btn {
  display: inline-block;
  font-family: var(--font);
  font-size: 1.02rem;
  font-weight: 700;
  padding: 13px 30px;
  border-radius: 999px;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: linear-gradient(180deg, #FF8A52, #F0682C);
  color: #20100A;
  box-shadow: 0 10px 30px rgba(232, 93, 38, 0.38), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.btn-primary:hover {
  background: linear-gradient(180deg, #FFA06B, #F97739);
  color: #20100A;
  box-shadow: 0 16px 38px rgba(232, 93, 38, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

/* 过渡 CTA：颜色更暗、不抢戏 */
.btn-quiet {
  background: transparent;
  color: rgba(255, 255, 255, 0.85);
  border-color: rgba(255, 255, 255, 0.35);
}
.btn-quiet:hover { color: #fff; border-color: rgba(255, 255, 255, 0.7); }

/* 浅色底上的过渡 CTA */
.btn-quiet-light {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--line);
}
.btn-quiet-light:hover { color: var(--ink); border-color: var(--ink-soft); }

.cta-row { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.cta-note { font-size: var(--fs-small); color: var(--ink-soft); margin: 1.1em 0 0; }
.on-dark .cta-note { color: rgba(255, 255, 255, 0.6); }

/* ---------- Hero（深空 + CSS 星球） ---------- */
.hero {
  position: relative;
  background:
    radial-gradient(1100px 720px at 86% 92%, rgba(232, 93, 38, 0.17), transparent 62%),
    radial-gradient(900px 620px at -12% -12%, rgba(30, 41, 88, 0.9), transparent 60%),
    linear-gradient(180deg, #0B1026 0%, #0E1430 58%, #131A3A 100%);
  color: rgba(255, 255, 255, 0.86);
  overflow: hidden;
  padding: clamp(4rem, 9vw, 7rem) 0;
}
/* 星点层（50%/51% 截断，星点边缘清晰） */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1.6px 1.6px at 12% 22%, rgba(255,255,255,0.85) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 28% 64%, rgba(255,255,255,0.5) 50%, transparent 51%),
    radial-gradient(1.8px 1.8px at 46% 13%, rgba(255,215,155,0.8) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 63% 40%, rgba(255,255,255,0.5) 50%, transparent 51%),
    radial-gradient(1.6px 1.6px at 79% 17%, rgba(255,255,255,0.75) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 89% 57%, rgba(255,255,255,0.5) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 8% 79%, rgba(255,255,255,0.6) 50%, transparent 51%),
    radial-gradient(1.2px 1.2px at 55% 87%, rgba(255,255,255,0.4) 50%, transparent 51%),
    radial-gradient(1.8px 1.8px at 37% 36%, rgba(255,255,255,0.65) 50%, transparent 51%);
  background-repeat: no-repeat;
  pointer-events: none;
}
.hero .container { position: relative; }

/* hero 内标题与眉题：白字 + 暖黄眉题（深空底） */
.hero h1, .hero h2, .hero h3 { color: #fff; text-shadow: 0 2px 24px rgba(7, 11, 29, 0.55); }
.hero h1 .hl { color: var(--sun); }
.hero .kicker { color: var(--sun); }
.hero .kicker::before { background: var(--sun); box-shadow: 0 0 10px rgba(255, 194, 75, 0.7); }

/* CSS 星球（品牌视觉锚点）：三层子元素实现环的前后穿插
   层叠顺序：后环(0) → 球体(1，不透明背景遮挡后环上弧) → 前环(2，只显示下半) */
.hero-planet {
  position: absolute;
  right: 2.5vw;
  bottom: 60px;
  width: clamp(240px, 30vw, 440px);
  height: clamp(240px, 30vw, 440px);
  z-index: 1;
  pointer-events: none;
}
.hero-planet .sphere {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  z-index: 1;
  background:
    radial-gradient(circle at 64% 58%, rgba(120, 38, 6, 0.35) 0 7.5%, transparent 8.5%),
    radial-gradient(circle at 46% 76%, rgba(120, 38, 6, 0.28) 0 5%, transparent 6%),
    radial-gradient(circle at 73% 33%, rgba(120, 38, 6, 0.22) 0 3.8%, transparent 4.8%),
    radial-gradient(circle at 30% 28%, var(--sun), var(--accent-bright) 32%, var(--accent) 58%, var(--accent-deep) 84%, #98300B);
  box-shadow:
    inset -24px -30px 72px rgba(70, 16, 0, 0.52),
    0 0 110px 12px rgba(232, 93, 38, 0.33);
}
.hero-planet .orbit {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 176%;
  height: 66%;
  transform: translate(-50%, -50%) rotate(-18deg);
}
.hero-planet .ring { width: 100%; height: 100%; border-radius: 50%; }
.hero-planet .orbit-back { z-index: 0; }
.hero-planet .orbit-back .ring {
  border: 3px solid rgba(255, 194, 75, 0.35);
  box-shadow: 0 0 14px rgba(255, 194, 75, 0.14);
}
.hero-planet .orbit-front { z-index: 2; }
.hero-planet .orbit-front .ring {
  border: 3px solid rgba(255, 194, 75, 0.88);
  clip-path: inset(50% -3% -3% -3%);
  box-shadow: 0 8px 22px rgba(255, 194, 75, 0.2);
}
@media (max-width: 768px) {
  .hero-planet {
    width: 240px;
    height: 240px;
    right: -70px;
    bottom: auto;
    top: 110px;
    opacity: 0.35;
  }
}
@media (max-width: 420px) {
  .hero-planet { width: 200px; height: 200px; right: -60px; top: 84px; }
}

.hero-inner { max-width: 40em; }
.hero h1 { margin-bottom: 0.5em; }
.hero .lede { font-size: clamp(1.02rem, 2.2vw, 1.2rem); max-width: 36em; }
.hero .cta-row { margin-top: 1.6em; }

/* 首屏之下的主张横条（橙色带 + 巨型水印字，data-mark 指定字） */
.claim-bar {
  position: relative;
  overflow: hidden;
  background: linear-gradient(96deg, #E85D26 0%, #EF6728 55%, #FF7A3D 100%);
  color: #20100A;
  text-align: center;
  padding: clamp(2.6rem, 6vw, 4.2rem) 20px;
  font-weight: 800;
  letter-spacing: 0.05em;
  font-size: clamp(1.35rem, 3.4vw, 2.4rem);
}
.claim-bar strong { color: #20100A; }
.claim-bar::after {
  content: attr(data-mark);
  position: absolute;
  right: 3%;
  top: 50%;
  transform: translateY(-50%);
  font-size: clamp(150px, 22vw, 290px);
  font-weight: 900;
  line-height: 0.9;
  color: rgba(255, 255, 255, 0.12);
  pointer-events: none;
  user-select: none;
}

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
@media (min-width: 680px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 920px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 28px;
  box-shadow: var(--shadow-card);
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(232, 93, 38, 0.35);
}
.card h3 { margin-top: 0; }
.card .card-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--accent-deep);
  background: rgba(232, 93, 38, 0.09);
  border-radius: 999px;
  padding: 3px 12px;
  margin-bottom: 12px;
}
.card-dark {
  background: var(--space-800);
  border-color: rgba(255, 255, 255, 0.1);
}
.card-dark, .card-dark h3 { color: rgba(255, 255, 255, 0.9); }
.card-dark .card-tag { color: var(--sun); background: rgba(255, 194, 75, 0.12); }

/* ---------- 步骤计划（三步） ---------- */
.steps { counter-reset: step; display: grid; gap: 18px; grid-template-columns: 1fr; }
@media (min-width: 820px) { .steps { grid-template-columns: repeat(3, 1fr); } }
.step {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px 24px 22px;
  box-shadow: var(--shadow-card);
}
.step::before {
  counter-increment: step;
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  font-size: 1.15rem;
  margin-bottom: 14px;
}
.step h3 { margin-bottom: 0.4em; }

/* ---------- 对比段（两栏 ✗/✓） ---------- */
.compare {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
@media (min-width: 780px) { .compare { grid-template-columns: repeat(2, 1fr); } }
.compare-col {
  border-radius: var(--radius);
  padding: 26px 24px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow-card);
}
.compare-col h3 { margin-top: 0; padding-bottom: 0.5em; border-bottom: 1px solid var(--line); }
.compare-col ul { list-style: none; padding: 0; margin-bottom: 0; }
.compare-col li { padding-left: 1.9em; position: relative; }
.compare-bad { border-top: 4px solid var(--bad); }
.compare-bad li::before {
  content: "×";
  position: absolute; left: 0.2em;
  color: var(--bad); font-weight: 800;
}
.compare-good { border-top: 4px solid var(--ok); }
.compare-good li::before {
  content: "✓";
  position: absolute; left: 0.2em;
  color: var(--ok); font-weight: 800;
}

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; }
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  font-size: 0.95rem;
}
th, td {
  text-align: left;
  padding: 12px 14px;
  border: 1px solid var(--line);
  vertical-align: top;
}
th { background: var(--paper-dim); font-weight: 700; white-space: nowrap; }
tbody tr:nth-child(even) { background: rgba(243, 240, 233, 0.5); }

/* ---------- 身份递进 / 链条 ---------- */
.progress-chain {
  display: grid;
  gap: 10px;
  grid-template-columns: 1fr;
  margin: 0 0 1.2em;
  padding: 0;
  list-style: none;
}
@media (min-width: 820px) {
  .progress-chain { grid-template-columns: 1fr auto 1fr auto 1fr; align-items: stretch; gap: 8px; }
  .progress-chain .chain-arrow { align-self: center; }
}
.progress-chain li {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin: 0;
  text-align: center;
}
.progress-chain .stage-no { display: block; font-size: 0.75rem; letter-spacing: 0.16em; color: var(--accent-deep); font-weight: 700; }
.progress-chain strong { font-size: 1.02rem; }
.progress-chain .chain-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  font-weight: 800;
  font-size: 1.3rem;
  padding: 0 2px;
}

/* 成品依赖链（纵向节点） */
.dep-chain { list-style: none; padding: 0; margin: 0; }
.dep-chain li {
  position: relative;
  padding: 0 0 18px 30px;
  margin: 0;
}
.dep-chain li::before {
  content: "";
  position: absolute;
  left: 7px; top: 8px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
}
.dep-chain li::after {
  content: "";
  position: absolute;
  left: 11px; top: 22px; bottom: -2px;
  width: 2px;
  background: var(--line);
}
.dep-chain li:last-child::after { display: none; }
.dep-chain .dep-final::before { background: var(--sun); box-shadow: 0 0 0 4px rgba(255, 194, 75, 0.3); }

/* ---------- FAQ（<details> 零 JS） ---------- */
.faq { display: grid; gap: 12px; }
.faq details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0 20px;
  box-shadow: 0 1px 2px rgba(34, 38, 58, 0.04);
}
.faq summary {
  cursor: pointer;
  font-weight: 700;
  padding: 15px 0;
  list-style: none;
  position: relative;
  padding-right: 34px;
  user-select: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 2px; top: 50%;
  transform: translateY(-50%);
  color: var(--accent);
  font-weight: 800;
  font-size: 1.3rem;
}
.faq details[open] summary::after { content: "–"; }
.faq .faq-a { padding: 0 0 16px; color: var(--ink-soft); margin: 0; }

/* ---------- 证言占位（红线：不编内容） ---------- */
.quote-placeholder {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  padding: 22px 24px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.6);
  font-size: var(--fs-small);
}

/* ---------- 结尾 CTA 横幅 ---------- */
.cta-banner {
  background:
    radial-gradient(700px 300px at 85% 0%, rgba(232, 93, 38, 0.22), transparent 60%),
    var(--space-900);
  color: rgba(255, 255, 255, 0.88);
  padding: var(--sp-block) 0;
}
.cta-banner h2 { color: #fff; }
.cta-banner .container { display: flex; flex-wrap: wrap; gap: 26px; align-items: center; justify-content: space-between; }
.cta-banner .cta-col { max-width: 34em; }

/* ---------- 面包屑 ---------- */
.breadcrumb { font-size: var(--fs-small); color: var(--ink-soft); padding: 18px 0 0; }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
.breadcrumb a { color: var(--ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent-deep); }

/* ---------- 文章页 ---------- */
.article-head { padding: calc(var(--sp-section) * 0.6) 0 0; }
.article-head .meta { font-size: var(--fs-small); color: var(--ink-soft); }
.prose { max-width: 44em; }
.prose h2 { margin-top: 1.8em; }
.prose blockquote {
  margin: 1.2em 0;
  padding: 14px 20px;
  border-left: 4px solid var(--accent);
  background: var(--paper-dim);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--ink);
}
.prose blockquote p:last-child { margin-bottom: 0; }

/* 文章卡片 */
.article-card { display: flex; flex-direction: column; gap: 6px; }
.article-card .meta { font-size: var(--fs-small); color: var(--ink-soft); }
.article-card h3 { margin: 0; }
.article-card p { color: var(--ink-soft); margin: 0; }
.article-card .more { margin-top: auto; padding-top: 8px; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: var(--space-950);
  color: rgba(255, 255, 255, 0.62);
  padding: 46px 0 34px;
  font-size: var(--fs-small);
}
.site-footer .container { display: grid; gap: 26px; grid-template-columns: 1fr; }
@media (min-width: 760px) { .site-footer .container { grid-template-columns: 2fr 1fr 1fr; } }
/* 页脚底部容器（主张 + 备案）保持单列 */
.site-footer > .container:last-child { display: block; }
.site-footer h4 { color: rgba(255, 255, 255, 0.88); font-size: 0.92rem; letter-spacing: 0.1em; margin-bottom: 0.8em; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer a { color: rgba(255, 255, 255, 0.62); text-decoration: none; }
.site-footer a:hover { color: var(--sun); }
.footer-claim { margin-top: 30px; padding-top: 18px; border-top: 1px solid rgba(255, 255, 255, 0.1); text-align: center; color: rgba(255, 255, 255, 0.5); }
.footer-claim strong { color: var(--sun); }
.footer-icp { margin: 14px 0 0; text-align: center; font-size: 0.8rem; }
.footer-icp a { color: rgba(255, 255, 255, 0.45); text-decoration: none; }
.footer-icp a:hover { color: var(--sun); }

/* ---------- 辅助 ---------- */
.lead-note { font-size: 1.05rem; color: var(--ink-soft); }
.center { text-align: center; }
.mt-2 { margin-top: 2em; }
.small { font-size: var(--fs-small); color: var(--ink-soft); }
.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* 动效克制 */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
  html { scroll-behavior: auto; }
}