:root {
  --c-bg: #FFFFFF;
  --c-panel: #F3F8FB;
  --c-panel-2: #E7F1F7;
  --c-border: #E3E8EE;
  --c-rail: #EEF2F6;
  --c-field: #F8FAFC;
  --c-stripe: #E6ECF2;
  --c-accent: #0C7FB0;
  --c-accent-dark: #085E85;
  --c-accent-tint: rgba(12,127,176,.08);
  --c-accent-ring: rgba(12,127,176,.26);
  --c-accent-shadow: rgba(12,127,176,.38);
  --c-text: #15202B;
  --c-muted: #5B6675;
  --c-faint: #8A94A3;
  --c-on-accent: #FFFFFF;
  --c-on-ink: #FFFFFF;
  --c-ink-sub: rgba(255,255,255,.8);
  --c-ink-chip: rgba(255,255,255,.14);
  --c-success: #1F9D61;
  --c-success-text: #176C44;
  --c-success-tint: rgba(31,157,97,.14);
  --c-warn: #C98A0B;
  --c-warn-text: #765107;
  --c-warn-tint: #FFF7E5;
  --c-error: #D9443A;
  --c-error-text: #AC3028;
  --c-error-tint: #FFF2F0;
  --c-chrome-dot: #D9DEE5;
  --c-switch-off: #CBD3DC;
  --c-highlight: rgba(255,255,255,.22);
  --c-veil: rgba(21,32,43,.24);
  --blob-peach: rgba(246,199,166,.92);
  --blob-lilac: rgba(216,205,243,.95);
  --blob-mint: rgba(191,231,223,.95);
  --blob-sky: rgba(205,230,245,.95);
  --mask-solid: #000000;
  --mask-clear: rgba(0,0,0,0);
  --shadow-xs: 0 1px 2px rgba(21,32,43,.06);
  --shadow-soft: 0 1px 2px rgba(21,32,43,.04),0 8px 24px -10px rgba(21,32,43,.10);
  --shadow-shell: 0 1px 2px rgba(21,32,43,.04),0 18px 40px -18px rgba(21,32,43,.12),0 48px 90px -48px rgba(21,32,43,.16);
  --shadow-float: 0 1px 2px rgba(21,32,43,.05),0 10px 28px -12px rgba(21,32,43,.16),0 30px 60px -34px rgba(21,32,43,.22);
  --shadow-tip: 0 2px 4px rgba(21,32,43,.12),0 10px 22px -8px rgba(21,32,43,.32);
  --shadow-cta: 0 1px 2px rgba(8,94,133,.24),0 8px 18px -8px var(--c-accent-shadow);
  --shadow-cursor: drop-shadow(0 2px 3px rgba(21,32,43,.28));
  --font-display: "Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono: "JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs: 4px;
  --r-sm: 6px;
  --r-md: 8px;
  --r-window: 9px;
  --r-rail: 10px;
  --r-lg: 14px;
  --r-node: 3px;
  --r-point: 2px;
  --r-pill: 999px;
  --r-round: 50%;
  --nav-h: 60px;
  --facts-h: 48px;
  --wrap: 1200px;
  --reading: 820px;
  --header-span: 1280px;
  --gutter: 20px;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 72px;
  --tour: 9s;
  --tour-step: 3s;
  --tour-third: 6s;
  --ease-tour: cubic-bezier(.55,0,.3,1);
  --ease-ui: cubic-bezier(.2,.7,.3,1);
  --time-ui: .2s;
  --time-reveal: .55s;
  --z-header: 40;
  --z-veil: 1;
  --z-drawer: 3;
  --z-fab: 30;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
[hidden] { display: none !important; }
img { max-width: 100%; height: auto; }
svg { display: block; flex-shrink: 0; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: var(--mask-clear); }
button { cursor: pointer; }
a { color: var(--c-accent-dark); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: .2em; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 4px;
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--c-text);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: clamp(34px,3.1vw,44px); font-weight: 800; line-height: 1.14; letter-spacing: -.015em; }
h2 { font-size: clamp(24px,2.3vw,32px); line-height: 1.3; font-weight: 750; letter-spacing: -.01em; }
h3 { font-size: 20px; line-height: 1.4; font-weight: 700; }
p { margin: 0 0 1em; }
ul, ol { padding-left: 1.5em; }
code { font-family: var(--font-mono); overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-field);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.8;
  overscroll-behavior-inline: contain;
}
pre code { overflow-wrap: normal; white-space: pre; }
hr { border: 0; border-top: 1px solid var(--c-border); margin-block: 32px; }
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-width: 0;
}
.reading { max-width: var(--reading); }
.section { padding-top: var(--space-6); padding-bottom: var(--space-6); }
.section--panel { background: var(--c-panel); color: var(--c-text); }
.section--decorated, .hero { position: relative; overflow-x: clip; }
.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(2,minmax(0,1fr)); }
.grid--3 { grid-template-columns: repeat(3,minmax(0,1fr)); }
.grid > *, .wrap > *, .prose > * { min-width: 0; }
.stack > * + * { margin-top: var(--space-3); }
.flow-row { display: flex; align-items: center; flex-wrap: wrap; gap: 12px; }
.flow-row > * { min-width: 0; }
.nowrap { white-space: nowrap; }
.muted { color: var(--c-muted); }
.small { font-size: 13px; }
.mono { font-family: var(--font-mono); }
.prose { min-width: 0; overflow-wrap: break-word; }
.prose h2 { margin-top: 2em; margin-bottom: .75em; }
.prose h3 { margin-top: 1.7em; }
.prose p, .prose li { line-height: 1.85; }
.prose li + li { margin-top: .45em; }
.prose :not(pre) > code {
  padding: .12em .3em;
  border-radius: var(--r-xs);
  background: var(--c-panel);
  color: var(--c-text);
  font-size: .9em;
}
.prose [id], section[id] { scroll-margin-top: 84px; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 9px 18px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  transition: transform var(--time-ui) var(--ease-ui);
  max-width: 100%;
}
.btn svg, .icon { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active, .btn.is-active { transform: translateY(1px); }
.btn--primary {
  background: var(--c-accent);
  color: var(--c-on-accent);
  border-color: var(--c-accent-dark);
  box-shadow: inset 0 1px 0 var(--c-highlight),var(--shadow-cta);
}
.btn--primary:hover, .btn--primary.is-hover { background: var(--c-accent-dark); color: var(--c-on-accent); }
.btn--ghost { background: var(--c-bg); color: var(--c-text); box-shadow: var(--shadow-xs); }
.btn--ghost svg { color: var(--c-muted); }
.btn--ghost:hover, .btn--ghost.is-hover { border-color: var(--c-switch-off); }
.btn--small { min-height: 36px; padding: 6px 12px; font-size: 13px; }
.btn:disabled, .btn[aria-disabled="true"] {
  cursor: not-allowed;
  background: var(--c-panel);
  color: var(--c-muted);
  border-color: var(--c-border);
  box-shadow: none;
  transform: none;
}
.panel, .surface-card {
  min-width: 0;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-bg);
  color: var(--c-text);
  padding: var(--space-3);
  box-shadow: var(--shadow-soft);
}
.panel--ice { background: var(--c-panel); color: var(--c-text); }
.surface-card h3 { margin-top: 0; }
.surface-card p:last-child { margin-bottom: 0; }
.rail {
  position: relative;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
}
.rail::before, .rail::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-node);
  background: var(--c-bg);
  color: var(--c-text);
  pointer-events: none;
}
.rail::before { top: -6px; left: -6px; }
.rail::after { bottom: -6px; right: -6px; }
.hatch {
  height: 56px;
  background: repeating-linear-gradient(45deg,var(--c-stripe) 0 1px,var(--mask-clear) 1px 9px);
  color: var(--c-text);
  border-block: 1px solid var(--c-rail);
}
.reveal { opacity: 1; transform: none; }
.reveal.is-waiting { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; transition: opacity var(--time-reveal) ease,transform var(--time-reveal) var(--ease-ui); }

/* 独立的宽页头版心，不复用正文 .wrap。 */
.topbar {
  height: var(--nav-h);
  border-bottom: 1px solid var(--c-border);
  background: var(--c-bg);
  color: var(--c-text);
  position: relative;
  z-index: var(--z-header);
}
.topbar__in {
  width: 100%;
  max-width: min(100%,calc(var(--header-span) + var(--gutter) * 2));
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -.01em;
  color: var(--c-text);
  white-space: nowrap;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand__mark { width: 26px; height: 26px; flex-shrink: 0; }
.mainnav { margin-left: auto; min-width: 0; }
.mainnav ul {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
}
.mainnav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  height: 36px;
  padding-inline: 10px;
  border-radius: var(--r-sm);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-muted);
  white-space: nowrap;
}
.mainnav a svg, .drawer a svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.mainnav a svg { color: var(--c-faint); }
.mainnav a:hover { color: var(--c-text); background: var(--c-panel); text-decoration: none; }
.mainnav a[aria-current="page"] { color: var(--c-accent-dark); background: var(--c-accent-tint); }
.mainnav a[aria-current="page"] svg { color: var(--c-accent); }
.header-tools { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.topbar__sep { width: 1px; height: 20px; background: var(--c-border); color: var(--c-text); }
.language { position: relative; }
.lang {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 34px;
  padding: 6px 12px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-bg);
  color: var(--c-muted);
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow-xs);
}
.lang svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; }
.lang__caret { font-size: 10px; }
.lang__short { display: none; }
.lang:hover { color: var(--c-text); border-color: var(--c-switch-off); }
.language-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 180px;
  padding: 6px;
  margin: 0;
  list-style: none;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-bg);
  color: var(--c-text);
  box-shadow: var(--shadow-float);
  z-index: 5;
}
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; color: var(--c-muted); border-radius: var(--r-sm); }
.language-menu a:hover, .language-menu a[aria-current] { background: var(--c-panel); color: var(--c-accent-dark); text-decoration: none; }
.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-bg);
  color: var(--c-text);
}
.menu-toggle svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; }
.drawer {
  position: absolute;
  inset: var(--nav-h) 0 auto;
  padding: 16px var(--gutter) 24px;
  max-height: calc(100dvh - var(--nav-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--c-bg);
  color: var(--c-text);
  border-bottom: 1px solid var(--c-border);
  box-shadow: var(--shadow-soft);
  z-index: var(--z-drawer);
}
.drawer ul { list-style: none; padding: 0; margin: 0; }
.drawer a { display: flex; align-items: center; gap: 10px; width: 100%; min-height: 48px; padding: 12px; border-radius: var(--r-sm); color: var(--c-muted); }
.drawer a:hover, .drawer a[aria-current] { background: var(--c-panel); color: var(--c-accent-dark); text-decoration: none; }
.drawer__label { margin: 16px 12px 4px; color: var(--c-muted); font-size: 12px; }
.nav-veil {
  position: fixed;
  inset: var(--nav-h) 0 0;
  width: 100%;
  border: 0;
  background: var(--c-veil);
  color: var(--c-text);
  z-index: var(--z-veil);
}
.site-footer { background: var(--c-panel); color: var(--c-text); border-top: 1px solid var(--c-border); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.1fr .8fr; gap: 40px; padding-top: 48px; padding-bottom: 36px; }
.footer-grid > * { min-width: 0; }
.footer-grid h2 { margin: 0 0 14px; font-size: 14px; }
.footer-grid p { margin-top: 16px; font-size: 13px; color: var(--c-muted); max-width: 300px; }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li + li { margin-top: 8px; }
.footer-grid a:not(.brand) { color: var(--c-muted); font-size: 13px; }
.footer-grid a:hover { color: var(--c-accent-dark); }
.footer-bottom { border-top: 1px solid var(--c-border); padding-top: 18px; padding-bottom: 24px; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; color: var(--c-muted); font-size: 12px; }
.footer-bottom p { margin: 0; }
.footer-legal { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-legal a { color: var(--c-muted); }

/* 拍板首屏：居中排版、横向平台框轨、配置导览演示框。 */
.hero__wrap {
  position: relative;
  width: min(var(--wrap),calc(100% - var(--gutter) * 2));
  margin-inline: auto;
  min-height: calc(100svh - var(--nav-h) - var(--facts-h));
  padding-top: 22px;
  padding-bottom: 26px;
  border-inline: 1px solid var(--c-rail);
  display: grid;
  align-content: center;
  justify-items: center;
}
.hero__wrap::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(var(--c-rail) 1px,var(--mask-clear) 1px),linear-gradient(90deg,var(--c-rail) 1px,var(--mask-clear) 1px);
  background-size: 56px 56px;
  background-position: center -1px;
  mask-image: radial-gradient(52% 42% at 50% 0%,var(--mask-solid) 0%,var(--mask-clear) 100%);
  pointer-events: none;
}
.node { position: absolute; width: 13px; height: 13px; border: 1px solid var(--c-border); border-radius: var(--r-node); background: var(--c-bg); color: var(--c-text); z-index: 2; }
.node--tl { top: -7px; left: -7px; }
.node--tr { top: -7px; right: -7px; }
.node--l { left: -7px; top: 50%; margin-top: -7px; }
.node--r { right: -7px; top: 50%; margin-top: -7px; }
.hero__copy { position: relative; z-index: 1; display: flex; flex-direction: column; align-items: center; text-align: center; padding-inline: var(--gutter); min-width: 0; }
.tags { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; justify-content: center; }
.tags__mark { width: 26px; height: 26px; display: grid; place-items: center; border: 1px solid var(--c-border); border-radius: var(--r-sm); background: var(--c-bg); color: var(--c-text); box-shadow: var(--shadow-xs); flex-shrink: 0; }
.tags__mark img { width: 16px; height: 16px; }
.tag { display: inline-flex; align-items: center; gap: 6px; min-height: 26px; padding: 3px 10px; border: 1px solid var(--c-border); border-radius: var(--r-sm); background: var(--c-bg); color: var(--c-muted); font-size: 12.5px; font-weight: 500; max-width: 100%; overflow-wrap: anywhere; }
.tag code { font-size: 11px; color: var(--c-muted); }
.tag:hover { color: var(--c-text); border-color: var(--c-switch-off); text-decoration: none; }
.hero__title { margin: 18px 0 0; font-family: var(--font-display); font-weight: 800; font-size: clamp(34px,3.1vw,44px); line-height: 1.14; letter-spacing: -.015em; }
.hero__title > span { display: block; }
.hero__lead { margin: 14px 0 0; max-width: 620px; font-size: 15.5px; line-height: 1.7; color: var(--c-muted); }
.hero__lead strong { color: var(--c-text); font-weight: 600; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 22px; }
.platline { position: relative; z-index: 1; justify-self: stretch; min-height: 24px; margin-top: 18px; display: flex; align-items: center; justify-content: center; }
.platline::before { content: ""; position: absolute; inset: 50% 0 auto; height: 1px; background: var(--c-rail); color: var(--c-text); }
.platforms { position: relative; display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 22px; padding: 0 18px; margin: 0; list-style: none; background: var(--c-bg); color: var(--c-muted); }
.platforms a { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; font-weight: 500; color: inherit; white-space: nowrap; }
.platforms a:hover { color: var(--c-accent-dark); text-decoration: none; }
.platforms svg { width: 15px; height: 15px; color: var(--c-text); }
.facts__wrap { width: min(var(--wrap),calc(100% - var(--gutter) * 2)); margin-inline: auto; border-inline: 1px solid var(--c-rail); }
.facts__row { min-height: var(--facts-h); margin: 0; padding: 10px var(--gutter); list-style: none; display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 22px; border-block: 1px solid var(--c-border); background: var(--c-panel); color: var(--c-muted); font-family: var(--font-mono); font-size: 12.5px; }
.facts__row li { display: inline-flex; align-items: center; gap: 7px; }
.facts__row li + li::before { content: ""; width: 5px; height: 5px; margin-right: 15px; border: 1px solid var(--c-switch-off); border-radius: var(--r-point); transform: rotate(45deg); flex-shrink: 0; }
.facts__row b { color: var(--c-text); font-weight: 600; }
@media (max-width: 1279px) {
  .mainnav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .topbar__in { gap: 16px; }
}
@media (min-width: 1280px) {
  .drawer, .nav-veil { display: none !important; }
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .grid--3 { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 768px) {
  h1, .hero__title { font-size: clamp(24px,4vw,30px); }
  .hero__wrap { min-height: auto; padding-top: 36px; padding-bottom: 28px; }
  .hero__lead { font-size: 14px; }
  .section { padding-top: 48px; padding-bottom: 48px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .grid--2, .grid--3 { grid-template-columns: minmax(0,1fr); }
  .tilt, .decor-tilt { transform: none !important; }
  .brand { font-size: 14px; gap: 7px; }
  .brand__mark { width: 24px; height: 24px; }
  .topbar__in { gap: 8px; }
  .header-tools { margin-left: auto; gap: 6px; }
  .topbar__sep { display: none; }
  .lang__full { display: none; }
  .lang__short { display: inline; }
  .lang { padding-inline: 9px; min-height: 44px; }
  .lang svg { display: none; }
  .hero__copy { padding-inline: var(--gutter); }
  .platforms { gap: 10px 16px; padding-inline: 12px; }
  .platforms a { font-size: 12px; }
  .platline { margin-top: 20px; }
  .facts__row { gap: 8px 16px; font-size: 11px; }
  .facts__row li + li::before { display: none; }
  .footer-grid { gap: 28px 20px; }
  .footer-brand { grid-column: 1 / -1; }
  .panel, .surface-card { padding: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal.is-waiting, .reveal.shown { opacity: 1; transform: none; transition: none; }
  .btn { transition: none; }
}