:root {
  color-scheme: light;
  --bg: #F7EEDD;
  --bg-top: #FBF6EC;
  --bg-bottom: #F1E5CF;
  --panel: #FFFBF4;
  --panel-2: #EFE3CD;
  --panel-3: #F8F0E2;
  --border: #E2D3B8;
  --border-soft: rgba(226,211,184,.75);
  --accent: #1A55F2;
  --accent-2: #4D86FF;
  --accent-dark: #0E38B5;
  --accent-tint: #E3EBFE;
  --accent-tint-strong: #D3E0FF;
  --ring-pale: #D8E3FF;
  --accent-a10: rgba(26,85,242,.10);
  --accent-a12: rgba(26,85,242,.12);
  --accent-a20: rgba(26,85,242,.20);
  --accent-a35: rgba(26,85,242,.35);
  --accent-dark-a40: rgba(14,56,181,.40);
  --spot: rgba(77,134,255,.07);
  --text: #2A2016;
  --muted: #6E5F4C;
  --ink-mono: #8C7B62;
  --ink-soft: #BBAB90;
  --led-off: #D5C6AB;
  --success: #1F8A4C;
  --warn: #C77A12;
  --error: #C2362B;
  --success-a30: rgba(31,138,76,.30);
  --success-a18: rgba(31,138,76,.18);
  --warn-a18: rgba(199,122,18,.18);
  --error-a18: rgba(194,54,43,.18);
  --white: #FFFFFF;
  --hi: rgba(255,255,255,.92);
  --hi-soft: rgba(255,255,255,.28);
  --pill-dark: rgba(42,32,22,.86);
  --pill-dark-2: rgba(255,255,255,.09);
  --brown-shadow: rgba(92,64,30,.08);
  --brown-shadow-strong: rgba(92,64,30,.22);
  --grain: #2A2016;
  --veil: rgba(42,32,22,.24);
  --clear: transparent;
  --flag-red: #D2352C;
  --flag-white: #FFFFFF;
  --flag-blue: #28407E;
  --flag-green: #1F8A4C;
  --flag-black: #2A2016;
  --flag-gold: #E5B13A;
  --flag-edge: rgba(42,32,22,.14);
  --mono-1: #5E4F3D;
  --mono-2: #7A6A54;
  --mono-3: #B3A285;
  --mono-4: #D8C8AB;
  --mono-paper: #FBF6EC;
  --mono-edge: rgba(42,32,22,.20);
  --fr: var(--flag-red);
  --fw: var(--flag-white);
  --fb: var(--flag-blue);
  --fg: var(--flag-green);
  --fk: var(--flag-black);
  --fy: var(--flag-gold);
  --fe: var(--flag-edge);
  --font-display: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --r-window: 32px;
  --r-card: 16px;
  --r-row: 12px;
  --r-small: 8px;
  --r-pill: 999px;
  --r-circle: 50%;
  --gutter: 24px;
  --content-width: 1200px;
  --head-height: 68px;
  --anchor-offset: 84px;
  --toc-offset: 152px;
  --ease: cubic-bezier(.2,.65,.3,1);
  --fast: .15s;
  --reveal-time: .35s;
  --shadow-panel: 0 24px 60px var(--accent-a10), inset 0 1px 0 var(--hi);
  --paper-texture: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 -.5'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
*, *::before, *::after { box-sizing: border-box; }
html { margin: 0; padding: 0; scroll-behavior: smooth; scroll-padding-top: var(--anchor-offset); }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font-body); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 10; background: var(--grain); opacity: .03; mask-image: var(--paper-texture); -webkit-mask-image: var(--paper-texture); mask-size: 180px 180px; -webkit-mask-size: 180px 180px; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { color: inherit; cursor: pointer; }
button, a { -webkit-tap-highlight-color: var(--accent-a12); }
button { border: 0; }
:where(a, button, input, select, textarea, summary, [tabindex]):focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
img { max-width: 100%; height: auto; }
svg, img { vertical-align: middle; flex-shrink: 0; }
svg { overflow: hidden; }
p { margin: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--text); margin: 0 0 20px; text-wrap: balance; overflow-wrap: break-word; }
h1 { font-size: clamp(52px, 5vw, 66px); font-weight: 900; line-height: 1.1; letter-spacing: -.02em; }
h2 { font-size: clamp(28px, 3vw, 40px); line-height: 1.2; font-weight: 900; letter-spacing: -.02em; }
h3 { font-size: 23px; line-height: 1.35; font-weight: 700; }
ul, ol { padding-left: 24px; }
pre { max-width: 100%; overflow-x: auto; padding: 20px; background: var(--panel-2); border-radius: var(--r-row); }
code { font-family: var(--font-mono); font-size: .88em; overflow-wrap: anywhere; }
pre code { overflow-wrap: normal; white-space: pre; }
table { border-collapse: collapse; }
[hidden] { display: none !important; }
:where(.grid, .card-grid, .footer-grid, .win-body, .feature-console) > * { min-width: 0; }
.no-break { white-space: nowrap; }
.wrap { width: 100%; max-width: calc(var(--content-width) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); min-width: 0; }
.section { padding-top: 80px; padding-bottom: 80px; }
.section-head { max-width: 800px; margin: 0 auto 36px; text-align: center; }
.section-head p { color: var(--muted); }
.reading-wrap { max-width: 860px; margin-inline: auto; padding-inline: var(--gutter); }
.prose { min-width: 0; overflow-wrap: break-word; }
.prose p, .prose ul, .prose ol { margin-bottom: 24px; }
.prose h2 { margin-top: 56px; }
.prose h3 { margin-top: 32px; }
.prose a:not(.btn) { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.prose li + li { margin-top: 8px; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.panel, .card { background: var(--panel); border: 1px solid var(--border-soft); box-shadow: var(--shadow-panel); }
.panel { border-radius: var(--r-window); padding: 32px; }
.card { border-radius: var(--r-card); padding: 24px; }
.card-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 24px; }
.reveal { transition: opacity var(--reveal-time) var(--ease), transform var(--reveal-time) var(--ease); }
.reveal.pending { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; }
#server-status { display: grid; position: static; min-width: 0; max-width: 100%; overflow: hidden; margin-block: 24px; gap: 16px; }
#server-status + * { margin-top: 24px; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.k-r { fill: var(--fr); }
.k-w { fill: var(--fw); }
.k-b { fill: var(--fb); }
.k-g { fill: var(--fg); }
.k-k { fill: var(--fk); }
.k-y { fill: var(--fy); }
.k-edge { fill: none; stroke: var(--fe); stroke-width: .8; }
.signal-stroke { fill: none; stroke: var(--white); stroke-width: 2.4; stroke-linecap: round; }
.signal-dot { fill: var(--white); }
.first { position: relative; overflow-x: clip; max-width: 100%; background: linear-gradient(180deg,var(--bg-top) 0%,var(--bg-bottom) 88%,var(--bg) 100%); }
.site-head, #site-header { position: relative; z-index: 40; }
.bar { max-width: 1320px; margin: 0 auto; padding: 0 40px; height: var(--head-height); display: flex; align-items: center; gap: 32px; flex-wrap: nowrap; position: relative; z-index: 43; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 800; font-size: 20px; line-height: 1; letter-spacing: -.02em; color: var(--text); flex: none; white-space: nowrap; }
.brand img { width: 32px; height: 32px; display: block; }
.led-word { color: var(--accent); }
.brand-zh { color: var(--muted); font-size: .8em; font-weight: 500; }
.desktop-nav { flex: 1; min-width: 0; }
.nav-links { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; justify-content: center; gap: 26px; }
.nav-links a { display: inline-flex; align-items: center; min-height: 40px; font-size: 15px; font-weight: 500; color: var(--muted); white-space: nowrap; transition: color var(--fast) ease; }
.nav-links a:hover { color: var(--text); }
.nav-links a[aria-current="page"] { color: var(--text); font-weight: 700; }
.nav-right { display: flex; align-items: center; gap: 10px; flex-shrink: 0; margin-left: auto; }
.language { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 0 10px; height: 40px; min-width: 44px; width: auto; font-size: 14px; font-weight: 500; color: var(--muted); white-space: nowrap; background: var(--clear); border-radius: var(--r-row); }
.lang span { white-space: nowrap; }
.lang svg { display: block; }
.lang-menu { display: none; position: absolute; right: 0; top: calc(100% + 8px); min-width: 180px; padding: 8px; margin: 0; list-style: none; border: 1px solid var(--border); background: var(--panel); border-radius: var(--r-card); box-shadow: var(--shadow-panel); z-index: 60; }
.lang-menu.is-open { display: block; }
.lang-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; border-radius: var(--r-small); }
.lang-menu a:hover, .lang-menu a[aria-current="true"] { background: var(--accent-tint); color: var(--accent-dark); }
.pill { display: inline-flex; align-items: center; justify-content: center; height: 40px; padding: 0 18px; border-radius: var(--r-pill); font-size: 14px; font-weight: 600; white-space: nowrap; flex-shrink: 0; transition: background-color var(--fast) ease; }
.pill-soft { background: var(--accent-tint); color: var(--accent-dark); }
.pill-soft:hover { background: var(--accent-tint-strong); }
.pill-solid { background: var(--accent); color: var(--white); box-shadow: inset 0 1px 0 var(--hi-soft),0 6px 16px -8px var(--accent-a35); }
.pill-solid:hover { background: var(--accent-dark); }
.menu-toggle { display: none; flex-direction: column; align-items: center; justify-content: center; gap: 5px; min-width: 44px; min-height: 44px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-row); }
.menu-line { display: block; width: 20px; height: 2px; background: currentColor; }
.menu-toggle[aria-expanded="true"] { color: var(--accent-dark); background: var(--accent-tint); }
.drawer { display: none; }
.nav-veil { display: none; }
html.nav-open { overflow: hidden; }
.drawer-languages { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 16px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 10px; height: 52px; padding: 0 30px; border-radius: var(--r-pill); font-size: 16px; font-weight: 700; white-space: nowrap; flex-shrink: 0; transition: background-color var(--fast) ease,box-shadow var(--fast) ease; }
.btn svg { display: block; }
.btn-main, .btn-primary { color: var(--white); background: linear-gradient(180deg,var(--accent-2) -30%,var(--accent) 62%); box-shadow: inset 0 1px 0 var(--hi-soft),0 12px 26px -10px var(--accent-a35); }
.btn-main:hover, .btn-primary:hover { box-shadow: inset 0 1px 0 var(--hi-soft),0 14px 30px -8px var(--accent-a35); }
.btn-main:active, .btn-primary:active { background: var(--accent-dark); }
.btn-soft, .btn-secondary { background: var(--accent-tint); color: var(--accent-dark); }
.btn-soft:hover, .btn-secondary:hover { background: var(--accent-tint-strong); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--panel-2); color: var(--muted); box-shadow: none; cursor: not-allowed; }
.hero { position: relative; z-index: 1; padding: 22px 40px 96px; }
.hero-inner { max-width: 1200px; margin: 0 auto; text-align: center; }
.kicker { display: inline-flex; align-items: center; gap: 10px; min-height: 30px; padding: 3px 14px 3px 12px; margin-bottom: 18px; border-radius: var(--r-pill); background: var(--panel); border: 1px solid var(--border-soft); box-shadow: 0 4px 14px -6px var(--accent-a12); font-size: 13px; font-weight: 500; color: var(--muted); }
.led { display: inline-block; width: 8px; height: 8px; border-radius: var(--r-circle); flex-shrink: 0; background: var(--led-off); box-shadow: inset 0 1px 1px var(--brown-shadow-strong); }
.led.on { background: var(--accent); box-shadow: 0 0 0 3px var(--accent-a20),0 0 10px var(--accent-a35); }
.hero h1 { margin: 0 0 22px; font-weight: 900; font-size: 66px; line-height: 1.06; letter-spacing: -.03em; }
.cta-row { display: flex; justify-content: center; gap: 14px; margin-bottom: 20px; }
.lede { max-width: 860px; margin: 0 auto 10px; font-size: 17px; line-height: 28px; color: var(--muted); }
.lede strong { color: var(--text); font-weight: 600; }
.trust { display: flex; justify-content: center; flex-wrap: wrap; gap: 0 10px; margin-bottom: 18px; font-size: 14px; line-height: 22px; color: var(--muted); }
.trust .sep { color: var(--ink-soft); }
.marks { list-style: none; padding: 0; margin: 0; display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 0 30px; min-height: 24px; color: var(--ink-mono); font-size: 14px; font-weight: 600; }
.marks li { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.marks svg { display: block; flex-shrink: 0; }
.marks-os { margin-bottom: 10px; }
.marks-flags { margin-bottom: 28px; gap: 0 26px; --fr: var(--mono-3); --fw: var(--mono-paper); --fb: var(--mono-2); --fg: var(--mono-2); --fk: var(--mono-1); --fy: var(--mono-4); --fe: var(--mono-edge); }
.site-footer { padding-top: 64px; padding-bottom: 24px; background: var(--panel-2); border-top: 1px solid var(--border); }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 48px; }
.footer-brand p { color: var(--muted); margin-top: 20px; max-width: 360px; }
.footer-title { font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer-links { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 6px 16px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 32px; color: var(--muted); font-size: 14px; }
.footer-links a:hover { color: var(--accent-dark); }
.footer-languages { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 32px; }
.footer-languages a { min-height: 32px; display: inline-flex; align-items: center; font-size: 14px; }
.footer-languages a[aria-current="true"] { color: var(--accent-dark); font-weight: 700; }
.footer-bottom { margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; font-size: 13px; color: var(--muted); }
.footer-bottom a { display: inline-flex; align-items: center; min-height: 28px; }
@media (max-width: 1280px) {
  .bar { gap: 18px; padding-inline: 24px; }
  .nav-links { gap: 16px; }
  .nav-links a { font-size: 14px; }
  .nav-right { gap: 8px; }
}
@media (max-width: 1180px) {
  .desktop-nav { display: none; }
  .menu-toggle { display: flex; }
  .nav-right { margin-left: auto; }
  .drawer { position: fixed; top: var(--head-height); inset-inline: 0; height: calc(100dvh - var(--head-height)); max-height: calc(100dvh - var(--head-height)); overflow-y: auto; overscroll-behavior: contain; z-index: 42; background: var(--panel); padding: 16px var(--gutter) 32px; }
  .drawer.is-open { display: block; }
  .drawer ul { list-style: none; margin: 0; padding: 0; }
  .drawer a { display: flex; align-items: center; width: 100%; min-height: 48px; padding: 12px 16px; border-radius: var(--r-row); }
  .drawer a:hover, .drawer a[aria-current] { background: var(--accent-tint); color: var(--accent-dark); }
  .nav-veil { position: fixed; top: var(--head-height); inset-inline: 0; bottom: 0; z-index: 41; background: var(--veil); }
  .nav-veil.is-open { display: block; }
}
@media (max-width: 768px) {
  :root { --gutter: 20px; }
  h1 { font-size: 38px; }
  h2 { font-size: 30px; }
  .bar { padding-inline: 20px; gap: 12px; }
  .header-start { display: none; }
  .hero { padding: 24px 20px 64px; }
  .hero h1 { font-size: 38px; line-height: 1.12; }
  .cta-row { flex-wrap: wrap; }
  .btn { height: 48px; padding-inline: 24px; }
  .marks { gap: 8px 18px; }
  .card-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .section { padding-top: 56px; padding-bottom: 56px; }
  .panel { padding: 24px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .no-break { white-space: normal; }
  h1, .hero h1 { font-size: 34px; }
  .bar { padding-inline: 16px; gap: 8px; }
  .brand { font-size: 16px; gap: 6px; }
  .brand img { width: 26px; height: 26px; }
  .nav-right { gap: 4px; margin-left: auto; }
  .nav-right .pill { padding-inline: 12px; font-size: 12px; }
  .lang { padding-inline: 4px; font-size: 11px; gap: 3px; }
  .lang svg { width: 10px; height: 10px; }
  .tilt, [data-tilt], .float { transform: none; }
  .first, .hero, [data-hero-visual] { max-width: 100%; }
  .panel { padding: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .reveal, .reveal.pending, .reveal.shown { opacity: 1; transform: none; }
}