:root {
  color-scheme: light;
  --bg: #f6f7fb;
  --surface: #fff;
  --ink: #16213a;
  --muted: #5d6985;
  --line: #dde2ee;
  --accent: #2f5bff;
  --accent-text: #284fe0;
  --accent-ink: #fff;
  --ok: #12a37f;
  --soft: #e8edff;
  --preview-shadow: 0 18px 40px -22px rgb(22 33 58 / 45%);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0f1526;
    --surface: #18203a;
    --ink: #eef1fa;
    --muted: #9aa5c4;
    --line: #2a3558;
    --accent: #6c8aff;
    --accent-text: #8fa6ff;
    --accent-ink: #0f1526;
    --ok: #3ed1a8;
    --soft: #222d55;
    --preview-shadow: 0 18px 40px -22px rgb(0 0 0 / 55%);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1526;
  --surface: #18203a;
  --ink: #eef1fa;
  --muted: #9aa5c4;
  --line: #2a3558;
  --accent: #6c8aff;
  --accent-text: #8fa6ff;
  --accent-ink: #0f1526;
  --ok: #3ed1a8;
  --soft: #222d55;
  --preview-shadow: 0 18px 40px -22px rgb(0 0 0 / 55%);
}
* { box-sizing: border-box; }
html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(88px + env(safe-area-inset-top, 0px));
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
}
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.75 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif; }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); background: var(--bg); z-index: 10; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
a:hover { color: var(--accent); }
[hidden] { display: none !important; }
.skip-link { position: fixed; top: -100px; left: 16px; z-index: 11; padding: 8px 16px; background: var(--surface); border: 1px solid var(--accent); border-radius: 8px; }
.skip-link:focus { top: calc(10px + env(safe-area-inset-top, 0px)); }
.site-header { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 9; background: var(--bg); border-bottom: 1px solid var(--line); }
.nav { max-width: 1040px; margin: auto; padding: 12px 20px; display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; margin-right: auto; font-size: 18px; font-weight: 800; white-space: nowrap; }
.logo { display: inline-flex; width: 26px; height: 26px; margin-right: 8px; border-radius: 7px; align-items: center; justify-content: center; background: var(--accent); color: var(--accent-ink); }
.navlinks { display: flex; align-items: center; gap: 18px; }
.navlinks > a { padding: 6px 4px; border-bottom: 2px solid transparent; color: var(--muted); white-space: nowrap; font-size: 14px; }
.navlinks > a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--accent); font-weight: 600; }
.navlinks > a:hover { color: var(--accent); }
.navlinks .install, .primary { border: 1px solid var(--accent); border-radius: 8px; background: var(--accent); color: var(--accent-ink); font-weight: 700; }
.navlinks .install { padding: 8px 14px; font-size: 14px; }
.navlinks .install:hover, .primary:hover { color: var(--accent-ink); filter: brightness(.94); }
.site-main { max-width: 1040px; margin: auto; padding: 0 20px; }
.home-hero { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 40px; align-items: center; padding: 48px 0 40px; }
.hero-copy { min-width: 0; }
.kicker, .eyebrow { color: var(--accent); font-size: 13px; font-weight: 700; }
.kicker { margin-bottom: 12px; }
.home-hero h1 { font-size: clamp(30px, 3.8vw, 40px); line-height: 1.3; letter-spacing: -.5px; margin: 0 0 16px; }
.lead { color: var(--muted); font-size: 17px; margin: 0 0 22px; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.primary, .secondary { display: inline-flex; align-items: center; justify-content: center; padding: 10px 18px; border-radius: 8px; font-size: 15px; font-weight: 700; text-align: center; }
.secondary { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.secondary:hover { border-color: var(--accent); }
.install-note { margin: 12px 0 0; font-size: 13px; color: var(--muted); }
.interface-preview { min-width: 0; margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); box-shadow: var(--preview-shadow); }
.preview-bar { display: flex; align-items: center; gap: 6px; padding: 10px 14px; border-bottom: 1px solid var(--line); background: var(--bg); }
.dot { flex: none; width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.preview-bar small { margin-left: 8px; font-size: 12px; color: var(--muted); }
.preview-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 16px; border-bottom: 1px solid var(--line); font-size: 14px; }
.preview-row > div { min-width: 0; }
.preview-row strong { display: block; font-weight: 600; }
.preview-row small { display: block; color: var(--muted); font-size: 12px; }
.tag { flex: none; padding: 2px 9px; border-radius: 99px; background: var(--soft); color: var(--accent-text); font-size: 12px; }
.preview-chat { padding: 12px 16px; background: var(--bg); font-size: 13px; }
.preview-chat-label { margin: 0 0 8px; color: var(--muted); font-size: 12px; }
.bubble { width: fit-content; max-width: 90%; margin: 6px 0; padding: 8px 12px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.bubble-ai { margin-left: auto; background: var(--soft); border-color: transparent; }
.preview-outcome { margin: 8px 0 0; color: var(--muted); font-size: 12px; }
.interface-preview figcaption { padding: 10px 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.sec { padding: 36px 0; border-top: 1px solid var(--line); }
.sec h2 { margin: 0 0 8px; font-size: 27px; line-height: 1.4; }
.sec-intro { margin: 0 0 22px; color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.feature { padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.feature h3 { margin: 0 0 8px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); font-size: 15px; }
.steps { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; counter-reset: step; }
.step { display: flex; gap: 16px; align-items: flex-start; }
.step::before { counter-increment: step; content: counter(step); flex: none; width: 32px; height: 32px; border-radius: 50%; background: var(--accent); color: var(--accent-ink); display: grid; place-items: center; font-weight: 700; }
.step > div { min-width: 0; }
.step h3 { margin: 0 0 3px; font-size: 16px; }
.step p { margin: 0; color: var(--muted); font-size: 15px; }
.text-link { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.faq details { margin-bottom: 10px; padding: 14px 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.faq details:last-child { margin-bottom: 0; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq p { color: var(--muted); font-size: 15px; margin: 10px 0 0; }
.doc-head { padding: 36px 0 24px; }
.doc-head h1 { margin: 0 0 8px; font-size: 34px; line-height: 1.3; }
.doc-head p { margin: 0; color: var(--muted); }
.docs { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 28px; align-items: start; padding-bottom: 40px; }
.sidebar { position: sticky; top: calc(88px + env(safe-area-inset-top, 0px)); max-height: calc(100dvh - 112px - env(safe-area-inset-top, 0px)); overflow-y: auto; padding: 16px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.sidebar > summary { display: none; }
.toc-group { display: block; margin: 16px 8px 6px; color: var(--muted); font-size: 12px; font-weight: 600; }
.toc-group:first-child { margin-top: 0; }
.sidebar a { display: block; margin: 2px 0; padding: 7px 8px; border-radius: 6px; color: var(--muted); font-size: 14px; }
.sidebar a[aria-current="location"] { color: var(--accent-text); background: var(--soft); font-weight: 600; }
.sidebar a:hover { color: var(--accent-text); }
.article { min-width: 0; padding: 28px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); overflow-wrap: anywhere; }
.article h2 { margin: 4px 0 16px; font-size: 24px; line-height: 1.4; }
.article h3 { margin: 26px 0 8px; font-size: 18px; }
.article h2:focus { outline: none; }
.article p, .article li { color: var(--muted); }
.article p { margin: 12px 0; }
.article ul, .article ol { padding-left: 23px; }
.article li + li { margin-top: 6px; }
.article a:not(.secondary) { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.article .secondary { margin-block: 2px; }
.article code, .policy-main code { padding: 2px 5px; border-radius: 4px; background: var(--bg); font-size: .9em; overflow-wrap: anywhere; }
.note, .article .note { margin: 20px 0; padding: 12px 16px; border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; background: var(--soft); color: var(--muted); font-size: 14px; }
.article .note a { color: var(--accent-text); }
.guide-panel { scroll-margin-top: calc(88px + env(safe-area-inset-top, 0px)); }
.guide-panel + .guide-panel { margin-top: 40px; border-top: 1px solid var(--line); padding-top: 28px; }
.js-guide .guide-panel { margin-top: 0; border-top: 0; padding-top: 0; }
.chapter-number { margin-bottom: 8px; color: var(--accent); font-size: 12px; }
.chapter-pager { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line); font-size: 14px; }
.policy-main { padding-top: 32px; padding-bottom: 40px; }
.policy-main .hero, .policy-main .content { padding: 28px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); }
.policy-main .hero { margin-bottom: 20px; }
.policy-main .hero h1 { margin: 8px 0 12px; font-size: clamp(26px, 3.4vw, 34px); line-height: 1.3; }
.policy-main .subtitle { margin: 0; color: var(--muted); }
.policy-main .meta { display: flex; flex-wrap: wrap; gap: 6px 24px; margin-top: 16px; color: var(--muted); font-size: 13px; }
.policy-main .notice, .policy-main .callout { padding: 12px 16px; border-left: 3px solid var(--accent); border-radius: 0 8px 8px 0; background: var(--soft); color: var(--muted); font-size: 14px; }
.policy-main .notice { margin-top: 20px; }
.policy-main .toc { padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.policy-main .toc strong { display: block; margin-bottom: 10px; font-size: 14px; }
.policy-main .toc-links { display: flex; flex-wrap: wrap; gap: 6px 22px; }
.policy-main .toc a { color: var(--accent); font-size: 14px; }
.policy-main .toc a:hover { text-decoration: underline; text-underline-offset: 3px; }
.policy-main article { max-width: 760px; overflow-wrap: anywhere; }
.policy-main section { padding-top: 28px; scroll-margin-top: calc(88px + env(safe-area-inset-top, 0px)); }
.policy-main h2 { margin: 0 0 12px; font-size: 22px; line-height: 1.4; }
.policy-main p, .policy-main li { color: var(--muted); }
.policy-main ul { padding-left: 23px; }
.policy-main li + li { margin-top: 6px; }
.policy-main .callout { margin: 20px 0; }
/* 保留真实截图的结构和样式，取得图片并替换说明后再移除 hidden。 */
.product-preview, .guide-shot { margin: 20px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.screenshot-placeholder { min-height: 185px; padding: 24px 18px; display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 8px; text-align: center; background: var(--bg); }
.screenshot-placeholder svg { width: 40px; height: 40px; color: var(--muted); }
.screenshot-placeholder span { color: var(--muted); font-size: 13px; }
.product-preview figcaption, .guide-shot figcaption { padding: 10px 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.site-footer { margin-top: 8px; border-top: 1px solid var(--line); }
.foot { max-width: 1040px; margin: auto; padding: 24px 20px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px 24px; color: var(--muted); font-size: 13px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 20px; }
@media (max-width: 900px) {
  .home-hero { gap: 24px; }
  .nav { gap: 18px; }
  .navlinks { gap: 12px; }
  .navlinks .install { padding-inline: 10px; }
}
@media (max-width: 760px) {
  .navlinks .install { display: none; }
  .home-hero { grid-template-columns: minmax(0, 1fr); gap: 24px; padding: 32px 0; }
  .home-hero h1 { font-size: 32px; }
  .lead { font-size: 16px; }
  .features { grid-template-columns: minmax(0, 1fr); gap: 14px; }
  .sec { padding: 28px 0; }
  .sec h2 { font-size: 24px; }
  .feature { padding: 20px; }
  .docs { grid-template-columns: minmax(0, 1fr); gap: 18px; padding-bottom: 28px; }
  .sidebar { position: static; max-height: none; padding: 14px 16px; }
  .sidebar > summary { display: list-item; cursor: pointer; color: var(--ink); font-size: 14px; }
  .sidebar .toc-group:first-child { margin-top: 14px; }
  .sidebar a { padding-block: 9px; }
  .article { padding: 22px; }
  .article h2 { font-size: 23px; }
  .doc-head { padding: 28px 0 20px; }
  .doc-head h1 { font-size: 30px; }
  .policy-main { padding-top: 24px; padding-bottom: 28px; }
  .policy-main .hero, .policy-main .content { padding: 22px; }
  .foot { flex-direction: column; }
}
@media (max-width: 420px) {
  html { scroll-padding-top: calc(120px + env(safe-area-inset-top, 0px)); }
  .nav { flex-wrap: wrap; gap: 6px 12px; padding: 10px 16px; }
  .brand { font-size: 16px; }
  .navlinks { width: 100%; gap: 18px; }
  .navlinks > a { font-size: 13px; }
  .site-main { padding-inline: 16px; }
  .home-hero h1 { font-size: 30px; }
  .actions { gap: 10px; }
  .primary, .secondary { padding: 10px 14px; font-size: 14px; }
  .preview-row { flex-wrap: wrap; gap: 6px; padding: 12px 14px; }
  .preview-bar, .preview-chat, .interface-preview figcaption { padding-inline: 14px; }
  .article, .policy-main .hero, .policy-main .content { padding: 18px; }
  .guide-panel, .policy-main section { scroll-margin-top: calc(120px + env(safe-area-inset-top, 0px)); }
  .faq details { padding: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}