/* AuraSnap 官网 · 共享样式
   系统字体（国内访问不依赖 Google Fonts），浅色 / 深色跟随系统，所有尺寸流式适配手机。 */

:root {
  --bg: #fbfbfd;
  --bg-alt: #f3f3f6;
  --surface: #ffffff;
  --surface-2: #f5f5f7;
  --text: #1d1d1f;
  --text-2: #55555c;
  --text-3: #86868b;
  --line: rgba(0, 0, 0, 0.08);
  --line-strong: rgba(0, 0, 0, 0.14);
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --accent-soft: rgba(0, 113, 227, 0.1);
  --accent-text: #0066cc;
  --pro: #7c4dff;
  --pro-soft: rgba(124, 77, 255, 0.1);
  --ok: #1a9e55;
  --warn-bg: #fff6e0;
  --warn-text: #8a5a00;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05), 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.05), 0 12px 32px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.06), 0 30px 80px rgba(0, 0, 0, 0.14);
  --glass: rgba(255, 255, 255, 0.72);
  --glass-line: rgba(255, 255, 255, 0.7);
  --nav-bg: rgba(251, 251, 253, 0.78);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 28px;
  --max: 1120px;
  --gutter: clamp(16px, 4vw, 32px);
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --bg-alt: #0d0d10;
    --surface: #161618;
    --surface-2: #1d1d20;
    --text: #f5f5f7;
    --text-2: #b4b4bb;
    --text-3: #86868b;
    --line: rgba(255, 255, 255, 0.1);
    --line-strong: rgba(255, 255, 255, 0.18);
    --accent: #2b8cff;
    --accent-hover: #4199ff;
    --accent-soft: rgba(43, 140, 255, 0.16);
    --accent-text: #4aa0ff;
    --pro: #a78bff;
    --pro-soft: rgba(167, 139, 255, 0.16);
    --ok: #3ccf7f;
    --warn-bg: rgba(255, 184, 0, 0.12);
    --warn-text: #ffcc66;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 30px 80px rgba(0, 0, 0, 0.6);
    --glass: rgba(40, 40, 44, 0.66);
    --glass-line: rgba(255, 255, 255, 0.14);
    --nav-bg: rgba(0, 0, 0, 0.72);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
@supports (overflow: clip) { body { overflow-x: clip; } }
img, svg { display: block; max-width: 100%; }
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; color: inherit; }
h1, h2, h3, h4 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; text-wrap: balance; }
.nw { white-space: nowrap; }
p { margin: 0; }
kbd {
  font-family: var(--font);
  font-size: 0.82em;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.9em;
  padding: 0.1em 0.5em;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--line-strong);
  box-shadow: 0 1px 0 var(--line-strong);
  color: var(--text);
  white-space: nowrap;
}
code { font-family: var(--mono); font-size: 0.88em; background: var(--surface-2); padding: 0.12em 0.4em; border-radius: 6px; word-break: break-all; }

.i { width: 1em; height: 1em; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; display: inline-block; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
.wrap-narrow { max-width: 820px; }
.section { padding: clamp(72px, 11vw, 140px) 0; }
.section-alt { background: var(--bg-alt); }
.section-tight { padding: clamp(56px, 8vw, 96px) 0; }

.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--accent-text); letter-spacing: 0.01em; }
.title-xl { font-size: clamp(32px, 7.4vw, 80px); letter-spacing: -0.035em; line-height: 1.06; }
.title-lg { font-size: clamp(28px, 5.2vw, 56px); letter-spacing: -0.03em; line-height: 1.1; }
.title-md { font-size: clamp(26px, 3.6vw, 40px); }
.lead { font-size: clamp(17px, 2.1vw, 22px); text-wrap: pretty; line-height: 1.55; color: var(--text-2); }
.muted { color: var(--text-2); }
.small { font-size: 14px; color: var(--text-3); }
.center { text-align: center; }
.head { max-width: 760px; margin: 0 auto clamp(40px, 6vw, 72px); text-align: center; }
.head .lead { margin-top: 18px; }
.head .eyebrow { margin-bottom: 14px; }
.grad-text { background: linear-gradient(100deg, #0071e3 0%, #7c4dff 55%, #e0457b 100%); -webkit-background-clip: text; background-clip: text; color: transparent; }
@media (prefers-color-scheme: dark) { .grad-text { background-image: linear-gradient(100deg, #4aa0ff 0%, #a78bff 55%, #ff7aa8 100%); } }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 48px; padding: 0 24px; border-radius: 999px;
  font-size: 16px; font-weight: 600; letter-spacing: -0.01em;
  border: 1px solid transparent; cursor: pointer; text-decoration: none !important;
  transition: background-color .2s ease, transform .15s ease, box-shadow .2s ease, border-color .2s ease;
  white-space: nowrap; -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(0.97); }
.btn .i { width: 18px; height: 18px; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 20px -6px rgba(0, 113, 227, 0.55); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-dark { background: var(--text); color: var(--bg); }
.btn-ghost { background: transparent; color: var(--accent-text); border-color: var(--line-strong); }
.btn-ghost:hover { background: var(--accent-soft); border-color: transparent; }
.btn-sm { height: 34px; padding: 0 16px; font-size: 14px; }
.btn-block { width: 100%; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.link-arrow { display: inline-flex; align-items: center; gap: 4px; font-weight: 600; }
.link-arrow .i { width: 15px; height: 15px; transition: transform .2s; }
.link-arrow:hover .i { transform: translateX(3px); }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--nav-bg);
  -webkit-backdrop-filter: saturate(180%) blur(20px); backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { height: 58px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--text); letter-spacing: -0.02em; text-decoration: none !important; }
.brand img { width: 28px; height: 28px; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a { color: var(--text-2); font-size: 14.5px; padding: 6px 12px; border-radius: 8px; text-decoration: none; transition: color .2s, background-color .2s; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; margin-left: auto; width: 40px; height: 40px; border: 0; background: transparent; border-radius: 10px; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle .i { width: 22px; height: 22px; }
@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; }
  .nav-cta { display: none; }
  .nav-links {
    position: fixed; top: 58px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 8px var(--gutter) 20px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
    transform: translateY(-8px); opacity: 0; visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
  }
  .nav.open .nav-links { transform: none; opacity: 1; visibility: visible; }
  .nav-links a { font-size: 17px; padding: 14px 4px; border-radius: 0; border-bottom: 1px solid var(--line); }
  .nav-links a:hover { background: transparent; }
  .nav-links .btn { margin-top: 16px; border-bottom: 0; color: #fff; padding: 0 24px; border-radius: 999px; }
}
@media (min-width: 861px) { .nav-links .btn { display: none; } }

.notice-bar { background: var(--accent-soft); color: var(--text); font-size: 14px; text-align: center; padding: 10px var(--gutter); }

/* ---------- Hero ---------- */
.hero { padding: clamp(48px, 9vw, 110px) 0 clamp(56px, 8vw, 100px); text-align: center; position: relative; }
.hero::before {
  content: ""; position: absolute; inset: -10% 0 auto; height: 720px; z-index: -1; pointer-events: none;
  background:
    radial-gradient(50% 50% at 30% 30%, rgba(0, 113, 227, 0.14), transparent 70%),
    radial-gradient(45% 45% at 72% 22%, rgba(124, 77, 255, 0.12), transparent 70%),
    radial-gradient(40% 40% at 55% 60%, rgba(224, 69, 123, 0.08), transparent 70%);
}
.hero-pill {
  display: inline-flex; align-items: center; gap: 8px; max-width: 100%;
  padding: 6px 14px 6px 6px; border-radius: 999px; margin-bottom: 26px;
  background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
  font-size: 13.5px; color: var(--text-2); text-decoration: none !important;
}
.hero-pill b { background: var(--accent); color: #fff; font-size: 12px; font-weight: 600; padding: 3px 9px; border-radius: 999px; white-space: nowrap; }
.hero-pill span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; min-width: 0; }
.hero-pill .i { width: 14px; height: 14px; color: var(--text-3); }
.hero .lead { max-width: 680px; margin: 22px auto 34px; }
.hero-meta { margin-top: 18px; font-size: 13.5px; color: var(--text-3); display: flex; flex-wrap: wrap; gap: 6px 18px; justify-content: center; }
.hero-meta span { display: inline-flex; align-items: center; gap: 6px; }
.hero-meta .i { width: 15px; height: 15px; color: var(--ok); }

/* ---------- 真实截图 ---------- */
.shot { margin: 0; }
.shot img { display: block; width: 100%; height: auto; border-radius: var(--radius); background: var(--surface-2); box-shadow: var(--shadow-lg), 0 0 0 1px var(--line); }
.shot figcaption { margin-top: 14px; font-size: 14px; line-height: 1.6; color: var(--text-3); text-align: center; text-wrap: pretty; }
.hero-shot { margin-top: clamp(40px, 7vw, 72px); }
.hero-shot .shot img { border-radius: clamp(14px, 2.2vw, 24px); }
.shot-cap { margin-top: 14px; font-size: 14px; color: var(--text-3); text-align: center; text-wrap: pretty; }
.stack { display: grid; gap: 16px; }
.shot-tabs { min-width: 0; }
.tab-row { display: flex; gap: 6px; margin-bottom: 16px; overflow-x: auto; scrollbar-width: none; padding: 2px; -webkit-mask-image: linear-gradient(90deg, #000 92%, transparent); mask-image: linear-gradient(90deg, #000 92%, transparent); }
.tab-row::-webkit-scrollbar { display: none; }
.tab-row button { flex: none; border: 1px solid var(--line); background: var(--surface); color: var(--text-2); font-size: 14px; font-weight: 600; padding: 7px 15px; border-radius: 999px; cursor: pointer; transition: background-color .2s, color .2s, border-color .2s; }
.tab-row button:hover { color: var(--text); }
.tab-row button[aria-selected="true"] { background: var(--text); color: var(--bg); border-color: transparent; }
.shot-tabs .shot[hidden] { display: none; }
.shot-tabs .shot { animation: shot-in .35s ease; }
@keyframes shot-in { from { opacity: 0; transform: scale(.985); } to { opacity: 1; transform: none; } }
.shot-tabs.wide { max-width: 980px; margin: 0 auto; }
.shot-tabs.wide .tab-row { justify-content: safe center; -webkit-mask-image: none; mask-image: none; flex-wrap: wrap; }
@media (max-width: 640px) { .shot-tabs.wide .tab-row { flex-wrap: nowrap; justify-content: flex-start; -webkit-mask-image: linear-gradient(90deg, #000 90%, transparent); mask-image: linear-gradient(90deg, #000 90%, transparent); } }
.wheels { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.wheels figure { margin: 0; border-radius: var(--radius); overflow: hidden; background: var(--surface); box-shadow: var(--shadow-md), 0 0 0 1px var(--line); }
.wheels img { width: 100%; height: auto; }
.wheels figcaption { padding: 10px 14px; font-size: 14px; font-weight: 600; text-align: center; }

/* ---------- 模块卡片网格 ---------- */
.mod-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.mod {
  display: flex; flex-direction: column; gap: 10px; padding: 26px 24px 24px;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  color: var(--text); text-decoration: none !important;
  transition: transform .25s cubic-bezier(.2, .8, .2, 1), box-shadow .25s ease, border-color .25s;
}
a.mod:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: transparent; }
.mod-ico { width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center; color: #fff; margin-bottom: 6px; }
.mod-ico.app-ico { padding: 0; background: none; border-radius: 0; object-fit: contain; }
.mod-ico .i { width: 24px; height: 24px; stroke-width: 1.9; }
.mod h3 { font-size: 19px; letter-spacing: -0.01em; }
.mod p { font-size: 15px; color: var(--text-2); line-height: 1.55; }
.mod .mod-key { margin-top: auto; padding-top: 8px; font-size: 13px; color: var(--text-3); display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.c-blue { background: linear-gradient(140deg, #3a9bff, #0066e0); }
.c-indigo { background: linear-gradient(140deg, #7d7aff, #5145e6); }
.c-purple { background: linear-gradient(140deg, #b67cff, #7f3fe6); }
.c-pink { background: linear-gradient(140deg, #ff7aa8, #e0336f); }
.c-orange { background: linear-gradient(140deg, #ffb340, #ff7a00); }
.c-green { background: linear-gradient(140deg, #4cd97b, #1ea250); }
.c-teal { background: linear-gradient(140deg, #4fd6d0, #129c9a); }
.c-cyan { background: linear-gradient(140deg, #5ac8fa, #1a8fd6); }
.c-gray { background: linear-gradient(140deg, #8e8e93, #545458); }
.c-red { background: linear-gradient(140deg, #ff6b61, #e0261c); }

/* ---------- 功能分节（文字 + 演示） ---------- */
.feature { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(32px, 6vw, 80px); align-items: center; }
.feature.flip { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); }
.feature.flip > .feature-copy { order: 2; }
.feature-copy .eyebrow { margin-bottom: 14px; }
.feature-copy h2 { margin-bottom: 18px; }
.feature-copy .lead { font-size: clamp(17px, 1.8vw, 19px); }
.bullets { list-style: none; padding: 0; margin: 26px 0 0; display: grid; gap: 14px; }
.bullets li { display: grid; grid-template-columns: 22px 1fr; gap: 12px; font-size: 16px; color: var(--text-2); line-height: 1.55; }
.bullets li .i { width: 20px; height: 20px; margin-top: 2px; color: var(--accent); }
.bullets b { color: var(--text); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 22px; }
.chip { font-size: 13px; font-weight: 500; padding: 5px 12px; border-radius: 999px; background: var(--surface-2); color: var(--text-2); border: 1px solid var(--line); white-space: nowrap; }
.chip-pro { background: var(--pro-soft); color: var(--pro); border-color: transparent; font-weight: 600; }
@media (max-width: 900px) {
  .feature, .feature.flip { grid-template-columns: minmax(0, 1fr); }
  .feature.flip > .feature-copy { order: 0; }
}

.demo { position: relative; border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-md); overflow: hidden; }
.demo-pad { padding: clamp(18px, 3vw, 32px); }
.demo-tint { background: linear-gradient(160deg, var(--surface) 0%, var(--surface-2) 100%); }

/* 大标题区块（亮点横幅） */
.spot-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.spot { padding: 28px 26px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.spot .i { width: 28px; height: 28px; color: var(--accent); margin-bottom: 16px; }
.spot h3 { font-size: 19px; margin-bottom: 8px; }
.spot p { font-size: 15px; color: var(--text-2); }
.spot .big { font-size: clamp(34px, 4vw, 44px); font-weight: 700; letter-spacing: -0.03em; line-height: 1; margin-bottom: 10px; }
.spot-grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 860px) { .spot-grid, .spot-grid.two { grid-template-columns: minmax(0, 1fr); } }

/* 快捷键 */
.keys-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.key-card { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 18px; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; font-size: 15px; }
.key-card span { display: inline-flex; gap: 4px; }
@media (max-width: 960px) { .keys-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 520px) { .keys-grid { grid-template-columns: minmax(0, 1fr); } }

/* CTA 区 */
.cta-card { text-align: center; padding: clamp(48px, 8vw, 88px) var(--gutter); border-radius: var(--radius-lg); background: var(--surface); border: 1px solid var(--line); box-shadow: var(--shadow-md); position: relative; overflow: hidden; }
.cta-card::before { content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none; background: radial-gradient(60% 80% at 50% 0%, var(--accent-soft), transparent 70%); }
.cta-card > * { position: relative; }
.cta-card .app-icon { width: 96px; height: 96px; margin: 0 auto 24px; filter: drop-shadow(0 10px 24px rgba(0, 0, 0, 0.22)); }
.cta-card .lead { margin: 16px auto 30px; max-width: 560px; }

/* 安装步骤 */
.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 40px; text-align: left; }
.step { padding: 22px; border-radius: var(--radius); background: var(--surface-2); }
.step .n { width: 28px; height: 28px; border-radius: 50%; background: var(--text); color: var(--bg); display: grid; place-items: center; font-size: 14px; font-weight: 700; margin-bottom: 12px; }
.step h4 { font-size: 16px; margin-bottom: 6px; letter-spacing: 0; }
.step p { font-size: 14.5px; color: var(--text-2); line-height: 1.55; }
@media (max-width: 760px) { .steps { grid-template-columns: minmax(0, 1fr); } }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; padding: 22px 0; font-size: 18px; font-weight: 600; display: flex; justify-content: space-between; gap: 16px; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary .i { width: 18px; height: 18px; color: var(--text-3); transition: transform .25s; flex: none; }
.faq details[open] summary .i { transform: rotate(90deg); }
.faq .ans { padding: 0 0 22px; color: var(--text-2); font-size: 16px; line-height: 1.7; }
.faq .ans p + p { margin-top: 10px; }

/* ---------- 页脚 ---------- */
.footer { border-top: 1px solid var(--line); padding: 48px 0 40px; font-size: 14px; color: var(--text-3); background: var(--bg); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 32px; }
.footer h5 { margin: 0 0 12px; font-size: 13px; color: var(--text); font-weight: 600; }
.footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.footer a { color: var(--text-2); }
.footer .brand { margin-bottom: 12px; }
.footer-note { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; font-size: 12.5px; line-height: 1.6; }
.footer-note p { max-width: 760px; }
@media (max-width: 760px) { .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .footer-grid > :first-child { grid-column: 1 / -1; } }

/* ---------- 文档页（指南 / 条款） ---------- */
.doc-hero { padding: clamp(48px, 8vw, 88px) 0 clamp(28px, 4vw, 40px); }
.doc-hero .lead { margin-top: 16px; max-width: 680px; }
.doc-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; align-items: start; padding-bottom: 96px; }
.toc { position: sticky; top: 82px; font-size: 14px; max-height: calc(100vh - 100px); overflow: auto; }
.toc a { display: block; padding: 6px 12px; color: var(--text-2); border-radius: 8px; text-decoration: none; border-left: 2px solid transparent; }
.toc a:hover { color: var(--text); background: var(--surface-2); }
.toc a.active { color: var(--accent-text); font-weight: 600; background: var(--accent-soft); }
.toc .toc-title { font-size: 12px; font-weight: 600; color: var(--text-3); padding: 0 12px 8px; text-transform: uppercase; letter-spacing: 0.06em; }
@media (max-width: 900px) {
  .doc-layout { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .toc { position: sticky; top: 58px; z-index: 5; max-height: none; display: flex; gap: 6px; overflow-x: auto; margin: 0 calc(-1 * var(--gutter)); padding: 10px var(--gutter); background: var(--nav-bg); -webkit-backdrop-filter: blur(20px); backdrop-filter: blur(20px); border-bottom: 1px solid var(--line); scrollbar-width: none; }
  .toc::-webkit-scrollbar { display: none; }
  .toc .toc-title { display: none; }
  .toc a { white-space: nowrap; border: 1px solid var(--line); border-radius: 999px; padding: 6px 14px; background: var(--surface); }
}
.prose { font-size: 16.5px; line-height: 1.75; color: var(--text-2); }
.prose h2 { font-size: clamp(26px, 3vw, 32px); color: var(--text); margin: 0 0 8px; padding-top: 8px; display: flex; align-items: center; gap: 12px; }
.prose h2 .mod-ico { width: 38px; height: 38px; border-radius: 10px; margin: 0; }
.prose h2 .mod-ico.app-ico { padding: 0; background: none; border-radius: 0; object-fit: contain; }
.mod-ico .i { width: 21px; height: 21px; }
.prose h3 { font-size: 19px; color: var(--text); margin: 32px 0 10px; letter-spacing: -0.01em; }
.prose p { margin: 0 0 14px; }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 16px; }
.prose li { margin: 6px 0; }
.prose li::marker { color: var(--text-3); }
.prose strong { color: var(--text); font-weight: 600; }
.prose .doc-sec { padding: 48px 0; border-top: 1px solid var(--line); }
.prose .doc-sec:first-child { border-top: 0; padding-top: 0; }
.prose .sec-sub { color: var(--text-3); font-size: 15px; margin-bottom: 22px; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 8px 0 20px; }
@media (max-width: 640px) { .prose table { display: block; overflow-x: auto; } .prose td:last-child { min-width: 180px; } }
.prose th, .prose td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.prose th { color: var(--text); font-weight: 600; font-size: 13.5px; background: var(--surface-2); white-space: nowrap; }
.prose td:first-child { white-space: nowrap; color: var(--text); }
.callout { display: flex; gap: 12px; padding: 16px 18px; border-radius: 14px; background: var(--accent-soft); color: var(--text); font-size: 15px; line-height: 1.6; margin: 8px 0 20px; }
.callout .i { width: 20px; height: 20px; color: var(--accent); margin-top: 2px; }
.callout.warn { background: var(--warn-bg); color: var(--warn-text); }
.callout.warn .i { color: currentColor; }
.feat-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 8px 0 20px; }
.feat-item { padding: 16px 18px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); }
.feat-item h4 { font-size: 16px; color: var(--text); margin-bottom: 6px; display: flex; align-items: center; justify-content: space-between; gap: 8px; letter-spacing: 0; flex-wrap: wrap; }
.feat-item p { font-size: 14.5px; margin: 0; line-height: 1.6; }
@media (max-width: 640px) { .feat-list { grid-template-columns: minmax(0, 1fr); } }

/* ---------- 显隐动画 ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s cubic-bezier(.2, .8, .2, 1), transform .8s cubic-bezier(.2, .8, .2, 1); }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); border: 0; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.wheels.four { grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 8px 0 22px; }
@media (max-width: 640px) { .wheels.four { grid-template-columns: repeat(2, minmax(0, 1fr)); } }