:root {
  --c-bg: #FFFFFF;
  --c-bg-panel: #F2F8F7;
  --c-bg-panel2: #E4F2F0;
  --c-border: #DDE7E6;
  --c-accent: #0FA59C;
  --c-accent-dark: #0A7C76;
  --c-text: #0F1B24;
  --c-text-muted: #5B6B75;
  --c-success: #1F9D55;
  --c-warn: #C98A0B;
  --c-error: #D6453D;
  --c-on-accent: #FFFFFF;
  --c-success-ink: #176F3D;
  --c-warn-ink: #805700;
  --c-error-ink: #A52D27;
  --c-glass: rgb(242 248 247 / .76);
  --c-glass-edge: rgb(255 255 255 / .85);
  --c-surface-soft: rgb(255 255 255 / .72);
  --c-glow: rgb(228 242 240 / .95);
  --c-glow-mid: rgb(242 248 247 / .85);
  --c-panel-wash: rgb(242 248 247 / .55);
  --c-none: rgb(255 255 255 / 0);
  --c-grid: rgb(15 165 156 / .15);
  --c-accent-halo: rgb(15 165 156 / .18);
  --c-accent-tint: rgb(15 165 156 / .08);
  --c-hover-fill: rgb(228 242 240 / .9);
  --c-veil: rgb(15 27 36 / .24);
  --m-on: #000000;
  --m-off: rgb(0 0 0 / 0);
  --sh-nav: 0 1px 2px rgb(15 27 36 / .04), 0 12px 32px -14px rgb(15 27 36 / .14);
  --sh-chip: 0 1px 2px rgb(15 27 36 / .04);
  --sh-btn: 0 1px 2px rgb(15 27 36 / .05), 0 6px 16px -10px rgb(15 27 36 / .16);
  --sh-card: 0 1px 2px rgb(15 27 36 / .03), 0 16px 36px -28px rgb(15 27 36 / .18);
  --sh-cta: inset 0 1px 0 rgb(255 255 255 / .22), 0 1px 2px rgb(10 124 118 / .30), 0 14px 28px -12px rgb(15 165 156 / .60);
  --sh-cta-hover: inset 0 1px 0 rgb(255 255 255 / .18), 0 1px 2px rgb(10 124 118 / .35), 0 18px 32px -12px rgb(15 165 156 / .70);
  --sh-menu: 0 2px 4px rgb(15 27 36 / .04), 0 20px 44px -18px rgb(15 27 36 / .22);
  --glow-hover: 0 0 0 4px rgb(15 165 156 / .10), 0 8px 22px -10px rgb(15 165 156 / .40);
  --ring-focus: 0 0 0 3px rgb(15 165 156 / .35);
  --r-sm: 6px;
  --r-md: 8px;
  --r-lg: 14px;
  --r-pill: 999px;
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --weight-display: 900;
  --weight-strong: 700;
  --weight-medium: 500;
  --wrap: 1200px;
  --reading: 800px;
  --nav-width: 1280px;
  --gutter: 24px;
  --peek: 56px;
  --section-space: 104px;
  --header-clearance: 112px;
  --ease-ui: .2s ease;
  --ease-reveal: .65s ease;
}
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 100px;
}
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button {
  border: 0;
  padding: 0;
  background: var(--c-none);
  color: var(--c-text);
  cursor: pointer;
}
button:disabled { cursor: not-allowed; }
img, svg { display: block; max-width: 100%; }
img { height: auto; }
svg, .chip-dot { flex-shrink: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--c-accent-dark); outline-offset: 3px; border-radius: var(--r-sm); }
::selection { background: var(--c-bg-panel2); color: var(--c-text); }
h1, h2, h3, h4 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: var(--weight-display);
  line-height: 1.25;
  letter-spacing: -.02em;
  text-wrap: balance;
}
h1 { font-size: clamp(34px, 3.2vw + 2px, 48px); line-height: 1.16; }
h2 { font-size: clamp(26px, 2.2vw + 4px, 34px); }
h3 { font-size: 23px; }
h4 { font-size: 18px; }
p { margin: 0 0 20px; }
ul, ol { padding-inline-start: 1.4em; }
li { margin-block: 6px; }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: .9em; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 24px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-bg-panel);
  color: var(--c-text);
  line-height: 1.8;
  tab-size: 2;
}
pre code { white-space: pre; overflow-wrap: normal; word-break: normal; font-size: 13px; }
hr { border: 0; border-top: 1px solid var(--c-border); margin-block: 32px; }
.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: calc(var(--reading) + var(--gutter) * 2); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section-panel { background: var(--c-bg-panel); color: var(--c-text); }
.page-main { padding-top: var(--header-clearance); }
.section-head { max-width: 700px; margin-bottom: 40px; }
.lead { color: var(--c-text-muted); font-size: 18px; }
.muted { color: var(--c-text-muted); }
.nowrap { white-space: nowrap; }
.text-link { color: var(--c-accent-dark); text-decoration: underline; text-underline-offset: 5px; }
.text-link:hover { text-decoration-thickness: 2px; }
.eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--c-accent-dark);
  line-height: 1.4;
}
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.grid > *, .feature-row > *, .footer-grid > *, .prose > *, .tabs, .tab-panel { min-width: 0; }
.stack > * + * { margin-top: 24px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 10px 22px;
  border: 1px solid var(--c-none);
  border-radius: var(--r-md);
  font-size: 16px;
  font-weight: var(--weight-strong);
  letter-spacing: -.005em;
  line-height: 1.4;
  text-align: center;
  transition: background-color var(--ease-ui), box-shadow var(--ease-ui), border-color var(--ease-ui), color var(--ease-ui);
}
.btn svg { width: 16px; height: 16px; }
.btn-primary { background: var(--c-accent); color: var(--c-on-accent); box-shadow: var(--sh-cta); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--c-accent-dark); color: var(--c-on-accent); box-shadow: var(--sh-cta-hover); }
.btn-ghost { background: var(--c-bg); color: var(--c-text); border-color: var(--c-border); box-shadow: var(--sh-btn); }
.btn-ghost:hover, .btn-ghost.is-hover { border-color: var(--c-accent); color: var(--c-accent-dark); box-shadow: var(--glow-hover); }
.btn:active { transform: translateY(1px); }
.btn.is-focus { box-shadow: var(--ring-focus); }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--c-bg-panel2);
  color: var(--c-text-muted);
  border-color: var(--c-border);
  box-shadow: none;
  pointer-events: none;
}
.btn-small { min-height: 44px; padding: 8px 16px; font-size: 14px; }
.arrow { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary .arrow { transition: transform var(--ease-ui); }
.btn-primary:hover .arrow { transform: translateX(3px); }
.card, .panel {
  padding: 28px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-bg);
  color: var(--c-text);
  box-shadow: var(--sh-card);
  min-width: 0;
  transition: box-shadow var(--ease-ui), border-color var(--ease-ui);
}
.card:hover { box-shadow: var(--glow-hover); }
.panel { background: var(--c-bg-panel); color: var(--c-text); }
.card p:last-child, .panel p:last-child { margin-bottom: 0; }
.decorated, .hero, .feature-visual { position: relative; overflow-x: clip; }
.skip {
  position: absolute; left: 16px; top: -60px; z-index: 60;
  padding: 8px 14px; border-radius: var(--r-md);
  background: var(--c-text); color: var(--c-on-accent); font-size: 14px;
}
.skip:focus { top: 12px; }
.topbar { position: absolute; inset: 16px 0 auto; z-index: 40; padding-inline: var(--gutter); }
.navbar {
  position: relative;
  max-width: min(100%, var(--nav-width));
  height: 60px; margin-inline: auto;
  display: flex; align-items: center; gap: 28px;
  padding: 0 12px 0 16px;
  background: var(--c-glass); color: var(--c-text);
  border: 1px solid var(--c-glass-edge);
  border-radius: var(--r-lg); box-shadow: var(--sh-nav);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; }
.brand-mark { width: 32px; height: 32px; flex-shrink: 0; }
.brand-name { font-family: var(--font-display); font-size: 17px; font-weight: 800; letter-spacing: -.01em; }
.desktop-nav { display: flex; align-items: center; gap: 16px; min-width: 0; }
.nav-list { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 2px; }
.nav-list li { margin: 0; }
.nav-link, .nav-more-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 38px; padding: 0 14px; border-radius: var(--r-md);
  font-size: 15px; font-weight: var(--weight-medium); color: var(--c-text-muted);
  white-space: nowrap;
}
.nav-link:hover, .nav-more-btn:hover { background: var(--c-hover-fill); color: var(--c-text); }
.nav-link[aria-current="page"], .nav-more-btn.is-current {
  color: var(--c-text); font-weight: 600; background: var(--c-surface-soft); box-shadow: var(--sh-chip);
}
.chev { width: 12px; height: 12px; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.nav-more, .language { position: relative; }
.nav-menu, .lang-menu {
  position: absolute; top: calc(100% + 10px); left: -8px; min-width: 248px;
  padding: 6px; border-radius: var(--r-md);
  background: var(--c-bg); color: var(--c-text);
  border: 1px solid var(--c-border); box-shadow: var(--sh-menu);
}
.lang-menu { left: auto; right: 0; min-width: 180px; }
.nav-menu a, .lang-menu a {
  display: block; min-height: 44px; padding: 10px 12px; border-radius: var(--r-sm);
}
.nav-menu a:hover, .lang-menu a:hover, .lang-menu a[aria-current] { background: var(--c-bg-panel); color: var(--c-text); }
.menu-title { display: block; font-size: 14px; font-weight: 600; line-height: 1.4; }
.menu-desc { display: block; font-size: 12.5px; color: var(--c-text-muted); line-height: 1.5; }
.nav-tail { margin-left: auto; display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.lang-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 38px; padding: 0 12px; border-radius: var(--r-md);
  border: 1px solid var(--c-border); background: var(--c-surface-soft); color: var(--c-text);
  font-size: 14px; font-weight: var(--weight-medium); white-space: nowrap;
}
.lang-btn:hover { border-color: var(--c-accent); box-shadow: var(--glow-hover); }
.globe { width: 16px; height: 16px; fill: none; stroke: var(--c-text-muted); stroke-width: 1.4; }
.lang-short, .menu-toggle, .mobile-drawer { display: none; }
.menu-toggle { min-width: 44px; min-height: 44px; align-items: center; justify-content: center; border-radius: var(--r-md); }
.menu-toggle svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.6; }
.nav-veil { position: fixed; inset: 0; z-index: 35; background: var(--c-veil); color: var(--c-text); cursor: default; }
.static-disclosure > summary { list-style: none; cursor: pointer; }
.static-disclosure > summary::-webkit-details-marker { display: none; }
.hero {
  isolation: isolate; overflow: hidden;
  min-height: max(720px, calc(100vh - var(--peek)));
  min-height: max(720px, calc(100svh - var(--peek)));
  display: grid; align-content: center; justify-items: center;
  padding: 96px var(--gutter) 32px;
  background: var(--c-bg); color: var(--c-text);
}
.hero-glow {
  position: absolute; inset: 0; z-index: -2;
  background: radial-gradient(ellipse 44% 40% at 50% 41%, var(--c-glow) 0%, var(--c-glow-mid) 42%, var(--c-none) 74%), linear-gradient(180deg, var(--c-bg) 0%, var(--c-panel-wash) 46%, var(--c-bg) 100%);
  color: var(--c-text);
}
.horizon {
  position: absolute; inset: auto 0 0; height: 330px; z-index: -1;
  perspective: 420px; perspective-origin: 50% 0%; overflow: hidden;
  -webkit-mask-image: radial-gradient(ellipse 60% 100% at 50% 100%, var(--m-on) 16%, var(--m-off) 78%);
  mask-image: radial-gradient(ellipse 60% 100% at 50% 100%, var(--m-on) 16%, var(--m-off) 78%);
}
.horizon-plane {
  position: absolute; left: -60%; right: -60%; bottom: 0; height: 580px;
  transform-origin: 50% 100%; transform: rotateX(72deg);
  background-image: linear-gradient(var(--c-grid) 1px, var(--c-none) 1px), linear-gradient(90deg, var(--c-grid) 1px, var(--c-none) 1px);
  background-size: 64px 64px; background-position: 50% 100%;
}
.hero-inner { position: relative; display: grid; justify-items: center; width: 100%; max-width: var(--wrap); min-width: 0; }
.hero-core { position: relative; isolation: isolate; display: flex; flex-direction: column; align-items: center; text-align: center; max-width: 100%; }
.ring { position: absolute; left: 50%; top: 50%; z-index: -1; width: 1180px; height: 536px; margin: -268px 0 0 -590px; pointer-events: none; }
.ring svg { position: absolute; inset: 0; width: 100%; height: 100%; max-width: none; overflow: visible; }
.ring-dashes { fill: var(--c-accent); }
.ring-words { fill: var(--c-accent-dark); }
.t-hi { fill-opacity: .8; }
.t-mid { fill-opacity: .5; }
.t-lo { fill-opacity: .22; }
.kw { font-family: var(--font-mono); font-size: 12.3px; font-weight: var(--weight-medium); letter-spacing: .02em; }
.kw-a { fill-opacity: .48; }
.kw-b { fill-opacity: .36; }
.kw-c { fill-opacity: .26; }
.hero-chip {
  margin: 0 0 24px; display: inline-flex; align-items: center; gap: 10px;
  min-height: 30px; padding: 6px 14px 6px 12px; border-radius: var(--r-pill);
  background: var(--c-bg-panel); color: var(--c-accent-dark);
  border: 1px solid var(--c-border); box-shadow: var(--sh-chip);
  font-size: 13px; font-weight: var(--weight-medium); line-height: 1.3;
}
.chip-dot { width: 7px; height: 7px; border-radius: var(--r-pill); background: var(--c-accent); color: var(--c-text); box-shadow: 0 0 0 3px var(--c-accent-halo); }
.hero h1 { margin-bottom: 20px; font-size: clamp(34px, 3.2vw + 2px, 48px); letter-spacing: -.02em; }
.h1-line { display: block; }
.h1-key {
  font-style: normal;
  background: linear-gradient(100deg, var(--c-accent-dark), var(--c-accent));
  color: var(--c-accent-dark);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: var(--c-none);
}
.hero-lead { margin: 24px 0 0; max-width: 620px; font-size: 17px; line-height: 1.75; color: var(--c-text-muted); text-wrap: balance; }
.hero-lead strong { color: var(--c-text); font-weight: 600; }
.hero-cta { display: flex; align-items: center; justify-content: center; gap: 12px; }
.platforms { margin-top: 100px; }
.platforms ul { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; padding: 0; margin: 0; list-style: none; }
.platforms li { margin: 0; }
.plat {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 36px; padding: 7px 14px 7px 12px; border-radius: var(--r-pill);
  background: var(--c-surface-soft); color: var(--c-text);
  border: 1px solid var(--c-border); box-shadow: var(--sh-chip);
  font-size: 13.5px; font-weight: var(--weight-medium); line-height: 1.4;
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
}
.plat svg { width: 15px; height: 15px; color: var(--c-text-muted); }
.plat:hover { border-color: var(--c-accent); color: var(--c-accent-dark); box-shadow: var(--glow-hover); }
.dl-peek {
  background: var(--c-bg-panel); color: var(--c-text);
  border-top: 1px solid var(--c-border); padding-top: 22px; padding-bottom: 120px;
}
.dl-peek h2 { margin-bottom: 14px; }
.feature-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 80px; padding-block: 64px; }
.feature-row.is-reversed .feature-copy { order: 2; }
.feature-visual { padding: 32px; border: 1px solid var(--c-border); border-radius: var(--r-md); background: var(--c-bg-panel); color: var(--c-text); box-shadow: var(--sh-card); min-width: 0; }
.feature-visual pre { margin: 0; background: var(--c-bg); color: var(--c-text); }
.line-art { width: 100%; height: auto; fill: var(--c-bg); stroke: var(--c-accent-dark); stroke-width: 1.2; stroke-linejoin: round; }
.line-art .art-fill { fill: var(--c-bg-panel2); }
.prose { min-width: 0; }
.prose h2 { margin-top: 56px; }
.prose h3 { margin-top: 32px; }
.prose a:not(.btn) { color: var(--c-accent-dark); text-decoration: underline; text-underline-offset: 4px; }
.prose :is(p, li) { overflow-wrap: break-word; }
.prose :is(div, section, article, figure) { min-width: 0; max-width: 100%; }
.prose figure { margin-inline: 0; }
.site-footer { border-top: 1px solid var(--c-border); padding-top: 64px; padding-bottom: 24px; background: var(--c-bg-panel); color: var(--c-text); }
.footer-grid { display: grid; grid-template-columns: 1.3fr .8fr 1.4fr .7fr; gap: 40px; }
.footer-brand p { margin-top: 20px; max-width: 320px; font-size: 14px; color: var(--c-text-muted); }
.footer-title { font-size: 14px; font-weight: var(--weight-strong); margin-bottom: 16px; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin: 0; }
.footer-links a { display: inline-flex; align-items: center; min-height: 36px; padding-block: 5px; font-size: 14px; color: var(--c-text-muted); }
.footer-links a:hover { color: var(--c-accent-dark); text-decoration: underline; text-underline-offset: 4px; }
.footer-bottom { margin-top: 44px; border-top: 1px solid var(--c-border); padding-top: 20px; font-size: 13px; color: var(--c-text-muted); }
.reveal { opacity: 1; }
.reveal-enabled .reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--ease-reveal), transform var(--ease-reveal); }
.reveal-enabled .reveal.shown { opacity: 1; transform: none; }
@media (max-width: 1100px) {
  .navbar { gap: 16px; }
  .desktop-nav { gap: 8px; }
  .nav-link, .nav-more-btn { padding-inline: 10px; }
  .ring { scale: .82; }
  .feature-row { gap: 40px; }
}
@media (max-width: 1000px) {
  .desktop-nav { display: none; }
  .nav-tail { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer {
    position: absolute; top: calc(100% + 12px); inset-inline: 0;
    padding: 12px; border: 1px solid var(--c-border); border-radius: var(--r-md);
    background: var(--c-bg); color: var(--c-text); box-shadow: var(--sh-menu);
    max-height: calc(100dvh - 104px); overflow-y: auto; overscroll-behavior: contain;
  }
  .mobile-drawer:not([hidden]) { display: block; }
  .mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 14px; border-radius: var(--r-sm); }
  .mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--c-bg-panel); color: var(--c-accent-dark); }
  .drawer-languages { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--c-border); }
  .static-mobile { display: block; }
  .static-mobile .mobile-drawer { display: none; }
  .static-mobile[open] .mobile-drawer { display: block; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .ring { scale: .6; }
  .platforms { margin-top: 72px; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-row { grid-template-columns: minmax(0, 1fr); }
  .feature-row.is-reversed .feature-copy { order: initial; }
}
@media (max-width: 768px) {
  h1, .hero h1 { font-size: clamp(24px, 4vw, 30px); }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; --section-space: 64px; }
  .wrap { padding-inline: var(--gutter); }
  .tilt, [data-tilt] { transform: none !important; rotate: none !important; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .feature-row { gap: 28px; padding-block: 40px; }
  .card, .panel, .feature-visual { padding: 22px; }
  .footer-grid { gap: 28px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .topbar { padding-inline: 12px; top: 12px; }
  .navbar { padding-inline: 10px; gap: 8px; }
  .brand { gap: 7px; }
  .brand-name { font-size: 15px; }
  .brand-mark { width: 28px; height: 28px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .lang-btn { gap: 5px; padding-inline: 8px; min-height: 44px; }
  .lang-btn .globe { display: none; }
  .hero { padding: 92px var(--gutter) 28px; }
  .ring { scale: .42; }
  .hero-lead { font-size: 15.5px; }
  .hero-cta { flex-direction: column; width: 100%; }
  .hero-cta .btn { width: 100%; }
  .platforms { margin-top: 56px; }
  .platforms ul { gap: 8px; }
  .plat { padding-inline: 11px; }
  pre { padding: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal-enabled .reveal { opacity: 1; transform: none; }
}