:root {
  --bg: #FFFFFF;
  --bg-panel: #F7F8F8;
  --bg-panel-2: #EEF0F0;
  --border: #E3E6E5;
  --border-strong: #C9CFCE;
  --accent: #0E7C74;
  --accent-dark: #0A5C56;
  --text: #15191A;
  --text-muted: #5B6466;
  --success: #1F9D55;
  --warn: #C98A0B;
  --error: #D23F4A;
  --white: #FFFFFF;
  --tint-blue: #8E96F2;
  --tint-lime: #CFE97A;
  --tint-rose: #F3B3C8;
  --clear: transparent;
  --grad-teal: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent) 100%);
  --dot-on-dark: rgba(255,255,255,.17);
  --dot-on-light: rgba(21,25,26,.11);
  --veil-dark: rgba(255,255,255,.12);
  --veil-light: rgba(255,255,255,.34);
  --sheen: linear-gradient(180deg,rgba(255,255,255,.14) 0%,rgba(255,255,255,0) 60%);
  --success-ring: rgba(31,157,85,.16);
  --accent-ring: rgba(14,124,116,.22);
  --sheet-edge: rgba(21,25,26,.07);
  --menu-veil: rgba(21,25,26,.24);
  --shadow-card: 0 1px 2px rgba(21,25,26,.04),0 6px 18px -6px rgba(21,25,26,.08);
  --shadow-float: 0 1px 3px rgba(21,25,26,.10),0 20px 36px -14px rgba(21,25,26,.34);
  --shadow-knob: 0 1px 2px rgba(21,25,26,.25);
  --shadow-seg: 0 1px 2px rgba(21,25,26,.12);
  --shadow-btn: 0 1px 2px rgba(10,92,86,.24),0 6px 14px -6px rgba(10,92,86,.45);
  --r-ctl: 6px;
  --r-card: 10px;
  --r-pill: 999px;
  --r-logo: 8px;
  --r-small: 3px;
  --r-segment: 4px;
  --r-round: 50%;
  --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;
  --size-body: 15px;
  --weight-body: 400;
  --weight-medium: 500;
  --weight-bold: 700;
  --weight-display: 800;
  --gutter: 48px;
  --reading-width: 1120px;
  --header-width: 1440px;
  --rail-gap: 20px;
  --card-w: calc((min(100vw,1440px) - var(--gutter) - var(--rail-gap) * 3) / 3.667);
  --card-h: 336px;
  --header-height: 60px;
  --section-space: 88px;
  --motion-fast: 160ms;
  --motion-reveal: 500ms;
  --ease: cubic-bezier(.2,.65,.3,1);
}
*, *::before, *::after { box-sizing: border-box; }
html { margin: 0; padding: 0; scroll-behavior: smooth; scroll-padding-top: 24px; }
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: var(--weight-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
html.nav-open { overflow: hidden; }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
a, button, summary, input, select, textarea { -webkit-tap-highlight-color: var(--accent-ring); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--r-ctl); }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; }
img, svg { max-width: 100%; vertical-align: middle; }
img { height: auto; }
svg, .icon, .badge-dot { flex-shrink: 0; }
button svg, .btn svg { width: 17px; height: 17px; flex-shrink: 0; }
main, section, article, aside, nav, div, li { min-width: 0; }
h1, h2, h3, h4 { font-family: var(--font-display); color: var(--text); text-wrap: balance; overflow-wrap: break-word; }
h1 { font-size: clamp(34px,3.4vw,48px); line-height: 1.12; font-weight: var(--weight-display); letter-spacing: -.02em; }
h2 { margin: 0 0 24px; font-size: clamp(25px,2.5vw,34px); line-height: 1.25; font-weight: var(--weight-display); letter-spacing: -.015em; }
h3 { margin: 0 0 12px; font-size: 21px; line-height: 1.4; font-weight: var(--weight-bold); }
p { margin: 0 0 18px; }
ul, ol { padding-inline-start: 1.5em; }
code { font-family: var(--font-mono); font-size: .9em; overflow-wrap: anywhere; }
pre { max-width: 100%; min-width: 0; overflow-x: auto; padding: 20px; border: 1px solid var(--border); border-radius: var(--r-ctl); background: var(--bg-panel); color: var(--text); font-family: var(--font-mono); font-size: 13px; line-height: 1.75; tab-size: 2; }
pre code { overflow-wrap: normal; word-break: normal; white-space: pre; }
hr { border: 0; border-top: 1px solid var(--border); margin-block: 32px; }
.wrap { width: 100%; max-width: calc(var(--reading-width) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section--panel { background: var(--bg-panel); color: var(--text); }
.section-intro { max-width: 720px; margin-bottom: 36px; }
.section-intro p, .muted { color: var(--text-muted); }
.keep { white-space: nowrap; }
.key, .text-link { color: var(--accent); }
.text-link { text-decoration: underline; text-underline-offset: 4px; }
.prose { max-width: 820px; min-width: 0; overflow-wrap: break-word; }
.prose h2 { margin-top: 56px; scroll-margin-top: 24px; }
.prose h3 { margin-top: 32px; scroll-margin-top: 24px; }
.prose p, .prose li { line-height: 1.9; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.prose > :first-child { margin-top: 0; }
.grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
.grid > * { min-width: 0; }
.panel, .surface-card { padding: 28px; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--bg); color: var(--text); box-shadow: var(--shadow-card); }
.panel--quiet { background: var(--bg-panel); color: var(--text); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 0 22px;
  border: 1px solid var(--clear); border-radius: var(--r-ctl);
  background: var(--bg); color: var(--text);
  font: 650 15px/1.3 var(--font-body); text-align: center;
  transition: background var(--motion-fast), border-color var(--motion-fast);
}
.btn-primary { background: var(--accent); color: var(--white); box-shadow: var(--shadow-btn); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-dark); color: var(--white); }
.btn-ghost { background: var(--bg); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover, .btn-ghost.is-hover { border-color: var(--text-muted); }
.btn:active, .btn.is-active { box-shadow: inset 0 0 0 2px var(--accent-ring); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--bg-panel-2); color: var(--text-muted); border-color: var(--border); box-shadow: none; }
.btn.is-focus { outline: 2px solid var(--accent); outline-offset: 3px; }
.button-row { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: var(--gutter); top: -100px; z-index: 100; padding: 12px 20px; background: var(--bg); color: var(--accent); border: 1px solid var(--accent); border-radius: var(--r-ctl); }
.skip-link:focus { top: 8px; }
.topbar, #site-header { position: relative; z-index: 50; background: var(--bg); color: var(--text); border-bottom: 1px solid var(--border); }
.topbar-inner {
  width: 100%; max-width: var(--header-width); margin-inline: auto;
  padding-inline: var(--gutter); height: var(--header-height);
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; font-family: var(--font-display); font-weight: var(--weight-display); font-size: 16.5px; letter-spacing: -.01em; }
.brand img { width: 30px; height: 30px; flex-shrink: 0; }
.desktop-nav { height: 100%; min-width: 0; margin-left: auto; }
.tabs { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; height: 100%; }
.tabs li { display: flex; height: 100%; }
.tabs a { position: relative; display: flex; align-items: center; padding-inline: 14px; min-height: 44px; font-size: 14.5px; font-weight: var(--weight-medium); color: var(--text-muted); white-space: nowrap; }
.tabs a:hover { color: var(--text); }
.tabs a[aria-current="page"] { color: var(--text); font-weight: 650; }
.tabs a[aria-current="page"]::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: -1px; height: 2px; background: var(--accent); border-radius: var(--r-small); }
.header-tools { display: flex; align-items: center; gap: 14px; flex-shrink: 0; }
.topbar-sep { width: 1px; height: 20px; background: var(--border); flex-shrink: 0; }
.language-picker { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 34px; padding-inline: 10px; border: 1px solid var(--border); border-radius: var(--r-ctl); background: var(--bg); color: var(--text); font: 500 13.5px/1 var(--font-body); white-space: nowrap; }
.lang svg { width: 15px; height: 15px; color: var(--text-muted); }
.lang:hover { border-color: var(--border-strong); }
.lang-caret { color: var(--text-muted); font-size: 11px; }
.lang-menu { position: absolute; top: calc(100% + 10px); right: 0; min-width: 176px; padding: 6px; margin: 0; list-style: none; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--bg); color: var(--text); box-shadow: var(--shadow-float); z-index: 4; }
.lang-menu a { display: flex; align-items: center; min-height: 44px; padding-inline: 12px; border-radius: var(--r-ctl); }
.lang-menu a:hover, .lang-menu a[aria-current="true"] { background: var(--bg-panel); color: var(--accent-dark); }
.menu-toggle { display: none; place-items: center; min-width: 44px; min-height: 44px; padding: 10px; border: 1px solid var(--border); border-radius: var(--r-ctl); background: var(--bg); color: var(--text); }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-drawer { display: none; }
.nav-veil { position: fixed; inset: var(--header-height) 0 0; border: 0; background: var(--menu-veil); color: var(--text); z-index: 1; }
.hero { background: var(--bg); color: var(--text); overflow-x: clip; }
.hero-copy { max-width: 880px; margin-inline: auto; padding: 30px 24px 0; text-align: center; }
.badge { display: inline-flex; align-items: center; gap: 9px; min-height: 26px; padding: 3px 12px 3px 10px; margin: 0 0 14px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--bg-panel); color: var(--text-muted); font-size: 12.5px; font-weight: var(--weight-medium); }
.badge-dot { width: 7px; height: 7px; border-radius: var(--r-round); background: var(--success); box-shadow: 0 0 0 3px var(--success-ring); }
.hero h1 { margin: 0 0 14px; font-size: clamp(34px,3.4vw,48px); line-height: 1.12; letter-spacing: -.02em; }
.hero h1 .line { display: block; }
.lede { margin: 0 auto 16px; max-width: 720px; font-size: 16.5px; line-height: 26px; color: var(--text-muted); }
.lede strong { color: var(--text); font-weight: 600; }
.chips { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin: 0 0 20px; padding: 0; list-style: none; }
.chips li { display: inline-flex; align-items: center; min-height: 24px; padding: 3px 10px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--bg); color: var(--text-muted); font: 500 11.5px/1.4 var(--font-mono); letter-spacing: .01em; }
.cta { display: flex; justify-content: center; gap: 12px; margin-bottom: 16px; }
.platforms { display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 12px 26px; margin: 0; padding: 0; list-style: none; }
.platforms a { display: inline-flex; align-items: center; gap: 8px; min-height: 30px; font-size: 13.5px; font-weight: var(--weight-medium); color: var(--text-muted); }
.plat-ico { width: 28px; height: 28px; display: inline-grid; place-items: center; border: 1px solid var(--border); border-radius: var(--r-ctl); background: var(--bg-panel); color: var(--text); flex-shrink: 0; }
.plat-ico svg { width: 14px; height: 14px; display: block; }
.platforms a:hover, .platforms a:hover .plat-ico { color: var(--accent); }
.platforms a:hover .plat-ico { border-color: var(--accent); }
.statusbar { margin-top: 40px; background: var(--bg-panel); color: var(--text); border-block: 1px solid var(--border); }
.statusbar-inner { max-width: 1440px; margin-inline: auto; padding: 22px var(--gutter); display: flex; flex-wrap: wrap; justify-content: center; align-items: center; gap: 6px 14px; font: 500 12.5px/1.4 var(--font-mono); }
.statusbar .k { color: var(--text-muted); margin-right: 6px; }
.statusbar .sep { color: var(--text-muted); }
.site-footer { padding-top: 64px; padding-bottom: 28px; border-top: 1px solid var(--border); background: var(--bg-panel); color: var(--text); }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1.2fr; gap: 48px; }
.footer-brand p { margin-top: 18px; max-width: 320px; color: var(--text-muted); font-size: 14px; }
.footer-heading { margin: 0 0 16px; font-size: 14px; font-weight: var(--weight-bold); }
.footer-links { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px 20px; list-style: none; padding: 0; margin: 0; }
.footer-links a, .footer-languages a { color: var(--text-muted); font-size: 13px; }
.footer-links a:hover, .footer-languages a:hover { color: var(--accent); text-decoration: underline; }
.footer-languages { display: flex; flex-wrap: wrap; gap: 12px 24px; padding-top: 32px; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px 24px; border-top: 1px solid var(--border); margin-top: 24px; padding-top: 24px; font-size: 12.5px; color: var(--text-muted); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 24px; }
.reveal { opacity: 1; transform: none; }
.reveal-pending .reveal:not(.shown) { opacity: 0; transform: translateY(14px); }
.reveal-pending .reveal { transition: opacity var(--motion-reveal) var(--ease), transform var(--motion-reveal) var(--ease); }
.reveal.shown { opacity: 1; transform: none; }
.decorated, [data-hero-visual] { overflow-x: clip; }
@media (min-width: 1536px) {
  .topbar-inner { max-width: min(100%,calc(1280px + var(--gutter) * 2)); }
}
@media (max-width: 1180px) {
  .desktop-nav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: grid; }
  .mobile-drawer:not([hidden]) { display: block; position: absolute; top: var(--header-height); inset-inline: 0; z-index: 3; max-height: calc(100dvh - var(--header-height)); overflow-y: auto; overscroll-behavior: contain; padding: 12px var(--gutter) 24px; border-bottom: 1px solid var(--border); background: var(--bg); color: var(--text); box-shadow: var(--shadow-card); }
  .mobile-drawer ul { list-style: none; padding: 0; margin: 0; }
  .mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 46px; padding: 10px 12px; border-radius: var(--r-ctl); }
  .mobile-drawer a[aria-current], .mobile-drawer a:hover { background: var(--bg-panel); color: var(--accent-dark); }
  .drawer-languages { border-top: 1px solid var(--border); margin-top: 12px; padding-top: 12px; }
}
@media (max-width: 1180px) {
  :root { --gutter: 32px; --card-w: 320px; }
}
@media (max-width: 768px) {
  h1, .hero h1 { font-size: clamp(24px,3.9vw,30px); }
  .grid { grid-template-columns: minmax(0,1fr); }
  .footer-grid { grid-template-columns: minmax(0,1fr); gap: 32px; }
  .footer-brand p { max-width: 100%; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; --card-w: 82vw; --card-h: 340px; --rail-gap: 14px; --section-space: 56px; }
  .topbar-inner { gap: 10px; }
  .header-tools { margin-left: auto; gap: 8px; }
  .brand { font-size: 14px; gap: 7px; }
  .brand img { width: 28px; height: 28px; }
  .lang { padding-inline: 8px; font-size: 12px; }
  .lang svg, .topbar-sep { display: none; }
  .hero-copy { padding: 26px 20px 0; }
  .hero h1 { line-height: 1.2; }
  .lede { font-size: 15px; line-height: 24px; }
  .cta { flex-direction: column; align-items: stretch; max-width: 320px; margin-inline: auto; }
  .platforms { gap: 12px 18px; }
  .statusbar-inner { justify-content: flex-start; }
  .panel, .surface-card { padding: 22px; }
  .tilt, [data-tilt] { transform: none !important; }
  .footer-links { gap: 12px; }
}
@media (max-width: 360px) {
  .brand { font-size: 12.5px; gap: 5px; }
  .header-tools { gap: 5px; }
  .lang { padding-inline: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal-pending .reveal:not(.shown) { opacity: 1; transform: none; }
}
@media print {
  .header-tools, .mobile-drawer, .nav-veil, .dl-fab { display: none !important; }
  .reveal-pending .reveal:not(.shown) { opacity: 1; transform: none; }
}