:root {
  --bg: #FFFFFF;
  --bg-panel: #F7F7F7;
  --bg-panel-2: #EFEFEF;
  --border: #E4E4E4;
  --border-strong: #CFCFCF;
  --accent: #F86424;
  --accent-deep: #E9561A;
  --accent-dark: #C9470F;
  --text: #1C1C1C;
  --text-muted: #5F5F5F;
  --success: #1F8A4C;
  --warn: #B7791F;
  --error: #C8322B;
  --on-accent: #FFFFFF;
  --on-accent-90: rgba(255, 255, 255, 0.9);
  --on-accent-72: rgba(255, 255, 255, 0.72);
  --on-accent-55: rgba(255, 255, 255, 0.55);
  --on-accent-34: rgba(255, 255, 255, 0.34);
  --on-accent-24: rgba(255, 255, 255, 0.24);
  --on-accent-12: rgba(255, 255, 255, 0.12);
  --tag-fill: rgba(233, 86, 26, 0.88);
  --edge-shade: rgba(201, 71, 15, 0.34);
  --edge-clear: rgba(201, 71, 15, 0);
  --glow-core: #FFF9EE;
  --glow-warm: rgba(255, 236, 204, 0.92);
  --glow-apricot: rgba(255, 196, 150, 0.5);
  --glow-clear: rgba(255, 196, 150, 0);
  --mask-hi: rgba(0, 0, 0, 0.22);
  --mask-lo: rgba(0, 0, 0, 0.06);
  --clear: transparent;
  --veil: rgba(28, 28, 28, 0.28);
  --shadow-pop: 0 10px 28px rgba(28, 28, 28, 0.08);
  --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-s: 6px;
  --r-m: 8px;
  --r-l: 10px;
  --r-xl: 12px;
  --r-node: 1px;
  --r-round: 50%;
  --gutter: 24px;
  --header-h: 64px;
  --page-gutter: 12px;
  --rail-x: max(20px, calc(50% - 640px));
  --node: 6px;
  --reading: 800px;
  --content: 1168px;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --speed: 180ms;
  --display-size: clamp(34px, 3.4vw, 48px);
  --section-size: clamp(24px, 2.4vw, 34px);
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, a { -webkit-tap-highlight-color: var(--clear); }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
svg, .pill-dot, .brand-mark, .btn-icon { flex-shrink: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--r-s); }
h1, h2, h3 { font-family: var(--font-display); font-weight: 700; text-wrap: balance; }
h1 { font-size: var(--display-size); line-height: 1.18; letter-spacing: -0.018em; }
h2 { font-size: var(--section-size); line-height: 1.25; letter-spacing: -0.018em; }
h3 { font-size: 21px; line-height: 1.4; }
p { margin: 0 0 1em; }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: 0.875em; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--r-m);
  background: var(--bg-panel);
  color: var(--text);
  font-size: 14px;
  line-height: 1.8;
  tab-size: 2;
}
pre code { font-size: inherit; white-space: pre; overflow-wrap: normal; word-break: normal; }
hr { border: 0; border-top: 1px solid var(--border); margin-block: 40px; }
.wrap { width: 100%; max-width: var(--content); margin-inline: auto; padding-inline: var(--gutter); }
.reading { width: 100%; max-width: calc(var(--reading) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.section { position: relative; padding-top: 80px; padding-bottom: 80px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.grid > *, .header-inner > *, .footer-grid > *, .prose, .prose div { min-width: 0; }
.stack > * + * { margin-top: 24px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.nowrap { white-space: nowrap; }
.muted { color: var(--text-muted); }
.eyebrow { margin: 0; font: 500 12.5px/1.4 var(--font-mono); letter-spacing: 0.06em; color: var(--accent-dark); }
.text-link { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 4px; }
.prose { line-height: 1.85; }
.prose h2 { margin-top: 2.5em; }
.prose h3 { margin-top: 2em; }
.prose a { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.prose li + li { margin-top: 8px; }
.prose :not(pre) > code { background: var(--bg-panel); color: var(--text); padding: 2px 5px; border-radius: var(--r-s); }
[id] { scroll-margin-top: 24px; }
.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; top: 8px; left: 16px; z-index: 100; padding: 10px 16px; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--r-s); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.page { position: relative; min-height: 100vh; }
.rails { position: absolute; inset: var(--header-h) 0 0; pointer-events: none; z-index: 0; }
.rails::before, .rails::after { content: ""; position: absolute; top: 0; bottom: 0; width: 0; border-left: 1px dashed var(--border); }
.rails::before { left: var(--rail-x); }
.rails::after { right: var(--rail-x); }
.node { position: absolute; top: 0; width: var(--node); height: var(--node); background: var(--bg); border: 1px solid var(--border-strong); border-radius: var(--r-node); z-index: 2; }
.node--l { left: var(--rail-x); transform: translate(-50%, -50%); }
.node--r { right: var(--rail-x); transform: translate(50%, -50%); }
.junction { position: relative; z-index: 1; margin-top: var(--page-gutter); border-top: 1px dashed var(--border); }
.site-header { position: relative; z-index: 40; height: var(--header-h); background: var(--bg); color: var(--text); border-bottom: 1px dashed var(--border); }
.header-inner { height: 100%; width: 100%; max-width: min(100%, calc(1280px + var(--gutter) * 2)); margin-inline: auto; padding-inline: var(--gutter); display: flex; align-items: center; gap: 18px; }
.site-header .node { top: 100%; }
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: -0.01em; }
.brand-mark { width: 30px; height: 30px; }
.desktop-nav { margin-left: auto; min-width: 0; height: 100%; }
.nav-list { display: flex; align-items: center; gap: 0; height: 100%; list-style: none; margin: 0; padding: 0; }
.nav-item { position: relative; display: flex; height: 100%; }
.nav-link { position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 4px; height: var(--header-h); padding: 0 14px; font: 500 15px/1 var(--font-body); color: var(--text-muted); background: var(--clear); border: 0; white-space: nowrap; transition: color var(--speed) var(--ease); }
.nav-link:hover { color: var(--text); }
.nav-link[aria-current="page"], .nav-link.is-current { color: var(--text); font-weight: 600; }
.nav-link[aria-current="page"]::after, .nav-link.is-current::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: -1px; height: 2px; background: var(--accent); }
.nav-caret { width: 12px; height: 12px; transition: transform var(--speed) var(--ease); }
.caret-line { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.nav-menu { position: absolute; top: calc(100% - 6px); right: 0; min-width: 248px; padding: 6px; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--r-l); box-shadow: var(--shadow-pop); z-index: 4; }
.nav-menu a { display: grid; gap: 2px; min-height: 44px; padding: 10px 12px; border-radius: var(--r-s); }
.nav-menu a:hover, .nav-menu a[aria-current="page"] { background: var(--bg-panel); color: var(--text); }
.menu-title { font-size: 14.5px; font-weight: 600; }
.menu-hint { font: 400 12px/1.4 var(--font-mono); color: var(--text-muted); }
.header-tools { position: relative; display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.lang-picker { position: relative; }
.lang-btn { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 36px; padding: 8px 12px; font: 500 14px/1 var(--font-body); color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: var(--r-m); }
.lang-btn:hover { border-color: var(--border-strong); background: var(--bg-panel); color: var(--text); }
.lang-globe { width: 15px; height: 15px; }
.globe-line { fill: none; stroke: currentColor; stroke-width: 1.4; }
.lang-arrow { color: var(--text-muted); font-size: 11px; }
.lang-menu { top: calc(100% + 8px); min-width: 180px; }
.lang-short { display: none; }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border: 1px solid var(--border); border-radius: var(--r-m); background: var(--bg); color: var(--text); }
.menu-toggle svg { width: 20px; height: 20px; }
.mobile-drawer { display: none; }
.nav-veil { position: fixed; inset: var(--header-h) 0 0; z-index: 1; border: 0; background: var(--veil); color: var(--text); }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 12px 22px; border: 1px solid var(--border-strong); border-radius: var(--r-l); font: 600 16px/1.35 var(--font-body); background: var(--bg); color: var(--text); text-align: center; transition: background-color var(--speed) var(--ease), border-color var(--speed) var(--ease), color var(--speed) var(--ease); }
.btn:hover, .btn.demo-hover { background: var(--bg-panel); color: var(--text); border-color: var(--text-muted); }
.btn:active, .btn.demo-active { background: var(--bg-panel-2); color: var(--text); }
.btn:disabled, .btn[aria-disabled="true"] { cursor: not-allowed; background: var(--bg-panel-2); color: var(--text-muted); border-color: var(--border); }
.btn[aria-disabled="true"] { pointer-events: none; }
.btn-accent { background: var(--accent); color: var(--text); border-color: var(--accent); }
.btn-accent:hover { background: var(--accent-deep); color: var(--text); border-color: var(--accent-deep); }
.btn-small { min-height: 44px; padding: 8px 14px; font-size: 14px; }
.btn-icon { width: 17px; height: 17px; }
.btn-line { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.panel, .card { min-width: 0; padding: 28px; border: 1px solid var(--border); border-radius: var(--r-m); background: var(--bg); color: var(--text); }
.panel-soft { background: var(--bg-panel); color: var(--text); }
.card h3 { margin-top: 0; }
.card p:last-child { margin-bottom: 0; }
.reveal { opacity: 1; transform: none; }
.reveal.reveal-pending { opacity: 0; transform: translateY(14px); transition: opacity 600ms var(--ease), transform 600ms var(--ease); }
.reveal.shown { opacity: 1; transform: none; }
.site-footer { position: relative; z-index: 1; border-top: 1px dashed var(--border); background: var(--bg); color: var(--text); padding-top: 56px; padding-bottom: 28px; }
.footer-grid { display: grid; grid-template-columns: 1.25fr 0.8fr 1.4fr 0.7fr; gap: 36px; }
.footer-intro { margin-top: 16px; max-width: 300px; color: var(--text-muted); font-size: 14px; }
.footer-heading { margin: 0 0 16px; font-size: 14px; font-weight: 700; }
.footer-links { margin: 0; padding: 0; list-style: none; }
.footer-links a { display: inline-flex; align-items: center; min-height: 36px; padding-block: 5px; font-size: 14px; color: var(--text-muted); }
.footer-links a:hover { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--border); font-size: 13px; color: var(--text-muted); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 20px; }
.hero { position: relative; z-index: 1; margin: var(--page-gutter) var(--page-gutter) 0; height: clamp(600px, calc(100vh - 140px), 1000px); border-radius: var(--r-xl); overflow: hidden; isolation: isolate; display: grid; grid-template-rows: minmax(40px, 1fr) auto minmax(300px, 1.3fr); justify-items: center; background: radial-gradient(ellipse 92% 78% at 50% 52%, var(--edge-clear) 55%, var(--edge-shade) 100%), linear-gradient(180deg, var(--accent) 0%, var(--accent-deep) 100%); color: var(--on-accent); }
.hero-visual { position: absolute; inset: 0; overflow: hidden; pointer-events: none; }
.hero-dots { position: absolute; inset: 0; z-index: 0; background-image: radial-gradient(circle, var(--on-accent) 0 0.7px, var(--clear) 1.1px); background-size: 3px 3px; -webkit-mask-image: radial-gradient(ellipse 72% 82% at 50% 80%, var(--mask-hi) 0%, var(--mask-lo) 100%); mask-image: radial-gradient(ellipse 72% 82% at 50% 80%, var(--mask-hi) 0%, var(--mask-lo) 100%); pointer-events: none; }
.hero-sun { position: absolute; left: 50%; bottom: 0; z-index: 1; width: min(1120px, 82%); height: 62%; transform: translateX(-50%) scale(1); transform-origin: 50% 100%; background: radial-gradient(ellipse 50% 78% at 50% 100%, var(--glow-core) 0%, var(--glow-warm) 18%, var(--glow-apricot) 42%, var(--glow-clear) 72%); pointer-events: none; animation: sun-breathe 8s ease-in-out infinite; }
@keyframes sun-breathe { 0%, 100% { transform: translateX(-50%) scale(1); } 50% { transform: translateX(-50%) scale(1.06); } }
.hero-fan { position: absolute; left: 50%; bottom: 0; z-index: 2; width: min(760px, 70%); aspect-ratio: 800 / 330; transform: translateX(-50%); pointer-events: none; }
.hero-fan svg { width: 100%; height: 100%; overflow: visible; }
.fan-dot { fill: var(--on-accent); }
.fan-field { fill: url(#fanDotGrid); opacity: 0.8; }
.stop-white { stop-color: var(--on-accent); }
.ring { fill: none; stroke: var(--on-accent); stroke-width: 1.5; }
.ring-in { opacity: 0.38; }
.ring-mid { opacity: 0.22; }
.ring-ticks { stroke-width: 6; stroke-dasharray: 1.4 10.6; opacity: 0.55; }
.ring-out { opacity: 0.62; }
.arc { fill: none; stroke: var(--on-accent); stroke-linecap: round; }
.arc-side { stroke-width: 1.5; opacity: 0.7; }
.arc-main { stroke-width: 2.25; opacity: 1; }
.tag rect { fill: var(--tag-fill); stroke: var(--on-accent); stroke-width: 1.25; }
.tag-side rect { stroke-opacity: 0.72; }
.tag text { font-family: var(--font-mono); font-size: 13.5px; font-weight: 500; letter-spacing: 0.1em; fill: var(--on-accent); text-anchor: middle; dominant-baseline: central; }
.tag-side text { fill-opacity: 0.86; }
.hero-copy { grid-row: 2; position: relative; z-index: 3; display: flex; flex-direction: column; align-items: center; text-align: center; padding: 0 24px; max-width: 1040px; min-width: 0; }
.fact-pill { display: inline-flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 10px; min-height: 32px; margin: 1em 0; padding: 5px 14px 5px 12px; border: 1px solid var(--on-accent-55); border-radius: var(--r-m); font-size: 13.5px; font-weight: 500; color: var(--on-accent); letter-spacing: 0.01em; }
.pill-dot { width: 7px; height: 7px; border-radius: var(--r-round); background: var(--on-accent); outline: 3px solid var(--on-accent-24); }
.pill-sep { color: var(--on-accent-55); }
.hero-title { margin: 26px 0 0; font-family: var(--font-display); font-weight: 700; font-size: clamp(28px, 3.4vw, 48px); line-height: 1.18; letter-spacing: -0.02em; color: var(--on-accent); }
.hero-title-line { display: block; }
.hero-sub { margin: 18px 0 0; max-width: 640px; font-size: 17px; line-height: 1.72; color: var(--on-accent-90); }
.hero-sub strong { font-weight: 600; color: var(--on-accent); background-image: linear-gradient(var(--on-accent-55), var(--on-accent-55)); background-repeat: no-repeat; background-size: 100% 1px; background-position: 0 100%; padding-bottom: 1px; }
.hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 28px; }
.btn-primary { background: var(--on-accent); color: var(--text); border-color: var(--on-accent); }
.btn-primary:hover { background: var(--bg-panel); color: var(--text); border-color: var(--on-accent); }
.btn-primary .btn-icon { color: var(--accent-dark); }
.btn-ghost { background: var(--clear); color: var(--on-accent); border-color: var(--on-accent-72); }
.btn-ghost:hover { background: var(--on-accent-12); color: var(--on-accent); border-color: var(--on-accent); }
.hero :focus-visible { outline-color: var(--on-accent); }
.platforms { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: 22px; }
.platform { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 34px; padding: 7px 13px 7px 11px; border: 1px solid var(--on-accent-34); border-radius: var(--r-m); font-size: 13.5px; font-weight: 500; color: var(--on-accent); transition: border-color var(--speed) var(--ease), background-color var(--speed) var(--ease); }
.platform:hover { border-color: var(--on-accent); background: var(--on-accent-12); color: var(--on-accent); }
.platform svg { width: 15px; height: 15px; }
.facts { position: relative; z-index: 1; padding-top: 40px; padding-bottom: 112px; }
.facts-title { margin: 14px 0 0; }
.facts-lead { margin: 12px 0 0; max-width: 620px; color: var(--text-muted); }
.facts-frame { position: relative; margin-top: 44px; }
.facts-band { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--border); color: var(--text); border: 1px solid var(--border); }
.fact-cell { min-width: 0; background: var(--bg); color: var(--text); padding: 28px 28px 32px; }
.fact-key { font: 500 12px/1.4 var(--font-mono); color: var(--text-muted); letter-spacing: 0.04em; }
.fact-name { margin: 10px 0 0; font-size: 18px; font-weight: 700; letter-spacing: -0.01em; }
.fact-text { margin: 8px 0 0; font-size: 15px; color: var(--text-muted); line-height: 1.7; }
.corner { position: absolute; width: var(--node); height: var(--node); background: var(--bg); border: 1px solid var(--border-strong); border-radius: var(--r-node); z-index: 2; }
.corner--tl { top: 0; left: 0; transform: translate(-50%, -50%); }
.corner--tr { top: 0; right: 0; transform: translate(50%, -50%); }
.corner--bl { bottom: 0; left: 0; transform: translate(-50%, 50%); }
.corner--br { bottom: 0; right: 0; transform: translate(50%, 50%); }
.decorated { position: relative; overflow-x: clip; }
@media (max-width: 1100px) {
  .desktop-nav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer:not([hidden]) { display: block; position: absolute; z-index: 3; top: var(--header-h); left: 0; right: 0; padding: 16px var(--gutter) 24px; max-height: calc(100dvh - var(--header-h)); overflow-y: auto; overscroll-behavior: contain; border-bottom: 1px solid var(--border); background: var(--bg); color: var(--text); }
  .mobile-drawer ul { list-style: none; margin: 0; padding: 0; }
  .mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 46px; padding: 10px 12px; border-radius: var(--r-s); }
  .mobile-drawer a:hover, .mobile-drawer a[aria-current="page"] { background: var(--bg-panel); color: var(--text); }
  .drawer-languages { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) { .hero-fan { width: 88%; } }
@media (max-width: 768px) {
  h1 { font-size: clamp(24px, 5vw, 30px); }
  .hero { height: auto; min-height: 660px; grid-template-rows: 56px auto minmax(220px, 1fr); }
  .hero-title { font-size: clamp(24px, 7vw, 30px); }
  .hero-sub { font-size: 15.5px; }
  .hero-fan { width: 100%; }
  .facts-band { grid-template-columns: 1fr; }
  .section { padding-top: 56px; padding-bottom: 56px; }
  .grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  .brand-text { display: none; }
  .header-inner { gap: 8px; }
  .header-tools { margin-left: auto; }
  .lang-btn { min-height: 44px; }
  .hero-copy { padding-inline: 16px; }
  .hero-title-line { overflow-wrap: normal; }
  .fact-pill { gap: 6px; font-size: 11px; padding-inline: 9px; }
  .hero-actions { gap: 8px; margin-top: 20px; }
  .hero-actions .btn { padding-inline: 16px; font-size: 15px; }
  .platforms { gap: 6px; }
  .platform { padding-inline: 9px; font-size: 12px; gap: 6px; }
  .panel, .card { padding: 20px; }
  .footer-grid { gap: 28px 20px; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-bottom { align-items: flex-start; flex-direction: column; }
  .tilt, [data-tilt] { transform: none !important; }
}
@media (max-width: 360px) {
  :root { --gutter: 16px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .hero-title { font-size: 24px; }
  .hero { min-height: 700px; grid-template-rows: 40px auto minmax(180px, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal.reveal-pending { opacity: 1; transform: none; }
}