:root {
  --bg: #FFFFFF;
  --panel: #F6F7FB;
  --panel-2: #EEF0F6;
  --border: #E3E6EE;
  --border-strong: #D6DAE4;
  --accent: #4D63E8;
  --accent-dark: #3446C4;
  --leaf: #6CBF78;
  --pine: #17573A;
  --text: #16181D;
  --muted: #5B6170;
  --success: #3F9F5A;
  --warn: #C98A12;
  --error: #D2463C;
  --on-accent: #FFFFFF;
  --mask-ink: #000000;
  --clear: transparent;
  --grad: linear-gradient(90deg, var(--accent) 0%, var(--accent) 18%, var(--leaf) 100%);
  --grad-btn: linear-gradient(115deg, var(--accent) 40%, var(--pine) 165%);
  --tint-violet: color-mix(in srgb, var(--accent) 8%, var(--bg));
  --tint-violet-edge: color-mix(in srgb, var(--accent) 16%, var(--bg));
  --tint-violet-line: color-mix(in srgb, var(--accent) 55%, var(--bg));
  --tint-leaf: color-mix(in srgb, var(--leaf) 20%, var(--bg));
  --tint-leaf-line: color-mix(in srgb, var(--success) 72%, var(--bg));
  --tint-warn: color-mix(in srgb, var(--warn) 12%, var(--bg));
  --glow: color-mix(in srgb, var(--accent) 13%, transparent);
  --on-accent-soft: color-mix(in srgb, var(--on-accent) 82%, transparent);
  --on-accent-line: color-mix(in srgb, var(--on-accent) 26%, transparent);
  --on-accent-dot: color-mix(in srgb, var(--on-accent) 38%, transparent);
  --on-accent-grid: color-mix(in srgb, var(--on-accent) 12%, transparent);
  --topbar-bg: color-mix(in srgb, var(--bg) 92%, transparent);
  --veil-bg: color-mix(in srgb, var(--text) 24%, transparent);
  --shadow-edge: 0 0 0 1px color-mix(in srgb, var(--text) 2%, transparent), 0 1px 2px color-mix(in srgb, var(--text) 6%, transparent);
  --shadow-float: 0 34px 80px -28px color-mix(in srgb, var(--accent-dark) 24%, transparent), 0 14px 30px -18px color-mix(in srgb, var(--text) 12%, transparent);
  --shadow-btn: inset 0 1px 0 color-mix(in srgb, var(--on-accent) 22%, transparent), 0 10px 22px -10px color-mix(in srgb, var(--accent) 70%, transparent);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', 'Apple SD Gothic Neo', 'Malgun Gothic', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --weight-heading: 400;
  --weight-medium: 500;
  --r: 8px;
  --r-sm: 6px;
  --r-pill: 999px;
  --r-circle: 50%;
  --container: 1120px;
  --reading: 800px;
  --header-width: 1280px;
  --gutter: 24px;
  --nav-h: 64px;
  --section-space: 88px;
  --h1-size: clamp(1.75rem, 1rem + 2.4vw, 3rem);
  --h2-size: clamp(1.5rem, 1rem + 1.4vw, 2.25rem);
  --h3-size: 1.25rem;
  --body-size: 16px;
  --small-size: 14px;
  --ease: 200ms ease;
  --reveal-duration: 600ms;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 24px); }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
a { color: inherit; text-underline-offset: .2em; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; }
img, video { max-width: 100%; height: auto; }
svg { vertical-align: middle; flex-shrink: 0; }
button svg, a svg { flex-shrink: 0; }
figure { margin: 0; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-heading);
  color: var(--text);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { margin: 20px auto 14px; font-size: var(--h1-size); line-height: 1.16; letter-spacing: -.015em; }
h2 { margin: 0 0 20px; font-size: var(--h2-size); line-height: 1.25; letter-spacing: -.01em; }
h3 { margin: 0 0 12px; font-size: var(--h3-size); line-height: 1.4; }
p { margin: 0 0 1em; }
strong { font-weight: var(--weight-medium); }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: .9em; }
pre {
  max-width: 100%;
  min-width: 0;
  margin: 20px 0;
  padding: 18px;
  overflow-x: auto;
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r);
  line-height: 1.7;
  tab-size: 2;
}
pre code { font-size: .85rem; white-space: pre; overflow-wrap: normal; word-break: normal; }
:where(main, section, article, aside, .grid, .grid > *, .cards > *, .footer-grid > *) { min-width: 0; }
:where(h2, h3, section[id], article[id]) { scroll-margin-top: calc(var(--nav-h) + 24px); }
.wrap { width: 100%; max-width: calc(var(--container) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--reading { max-width: calc(var(--reading) + var(--gutter) * 2); }
.sec { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.prose { min-width: 0; overflow-wrap: break-word; }
.prose h2 { margin-top: 2.5em; }
.prose h3 { margin-top: 1.8em; }
.prose li + li { margin-top: .55em; }
.prose a { color: var(--accent-dark); }
.prose img { display: block; margin-inline: auto; }
.prose > :first-child { margin-top: 0; }
.prose :where(div, figure, section) { min-width: 0; max-width: 100%; }
.nowrap { white-space: nowrap; }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); }
.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: var(--gutter); z-index: 100; padding: 10px 18px; background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: var(--r); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.panel, .surface-card {
  min-width: 0;
  padding: 24px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--r);
  box-shadow: var(--shadow-edge);
}
.panel--soft { background: var(--panel); color: var(--text); }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 10px 24px;
  border: 1px solid var(--clear);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 15.5px;
  font-weight: var(--weight-medium);
  line-height: 24px;
  text-align: center;
  text-decoration: none;
  transition: transform var(--ease), box-shadow var(--ease), background-color var(--ease), border-color var(--ease);
}
.btn svg { width: 17px; height: 17px; }
.btn--pri { background: var(--grad-btn); color: var(--on-accent); box-shadow: var(--shadow-btn); }
.btn--pri:hover, .btn--pri.is-hover { transform: translateY(-1px); }
.btn--sec { background: var(--bg); color: var(--accent-dark); border-color: var(--tint-violet-line); }
.btn--sec:hover, .btn--sec.is-hover { background: var(--tint-violet); color: var(--accent-dark); border-color: var(--accent); }
.btn--quiet { background: var(--panel); color: var(--text); border-color: var(--border); }
.btn:active, .btn.is-active { transform: translateY(1px); box-shadow: var(--shadow-edge); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--panel-2); color: var(--muted); box-shadow: none; border-color: var(--border); transform: none; }
.btn.is-focus { outline: 2px solid var(--accent); outline-offset: 3px; }
.topbar, #site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--topbar-bg);
  color: var(--text);
  backdrop-filter: saturate(1.2) blur(10px);
  -webkit-backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--border);
}
.topbar__in {
  position: relative;
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  min-height: var(--nav-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
.brand img { width: 30px; height: 30px; flex-shrink: 0; display: block; }
.brand__name { font-family: var(--font-display); font-size: 17px; font-weight: var(--weight-medium); letter-spacing: -.005em; }
.nav { margin-left: auto; min-width: 0; }
.nav ul { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 2px; }
.nav li { min-width: 0; }
.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 5px 14px;
  border-radius: var(--r-pill);
  font-size: 14.5px;
  line-height: 24px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: background-color var(--ease), color var(--ease);
}
.nav a:hover { background: var(--panel); color: var(--text); }
.nav a[aria-current="page"] { background: var(--grad-btn); color: var(--on-accent); box-shadow: var(--shadow-btn); }
.header-tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.language-picker { position: relative; }
.lang {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 34px;
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 22px;
  white-space: nowrap;
  text-decoration: none;
}
.lang svg { width: 15px; height: 15px; }
.lang:hover { color: var(--text); border-color: var(--border-strong); }
.lang-short { display: none; }
.lang-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 12px);
  min-width: 180px;
  padding: 6px;
  margin: 0;
  list-style: none;
  border: 1px solid var(--border);
  border-radius: var(--r);
  box-shadow: var(--shadow-edge), var(--shadow-float);
  background: var(--bg);
  color: var(--text);
}
.lang-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; text-decoration: none; border-radius: var(--r-sm); }
.lang-menu a:hover, .lang-menu a[aria-current] { background: var(--panel); color: var(--text); }
.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); background: var(--bg); color: var(--text); }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-nav { display: none; }
.nav-veil { position: fixed; inset: var(--nav-h) 0 0; z-index: 40; border: 0; background: var(--veil-bg); color: var(--text); }
.site-footer { border-top: 1px solid var(--border); background: var(--panel); color: var(--text); padding-top: 56px; padding-bottom: 24px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr .9fr 1.4fr .8fr; gap: 32px; }
.footer-brand p { max-width: 280px; margin-top: 18px; color: var(--muted); font-size: var(--small-size); }
.site-footer h2 { font-size: 15px; margin-bottom: 16px; font-weight: var(--weight-medium); }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links li + li { margin-top: 8px; }
.footer-links a { font-size: var(--small-size); color: var(--muted); text-decoration: none; overflow-wrap: break-word; }
.footer-links a:hover { color: var(--text); text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 13px; color: var(--muted); }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(18px); }
html.reveal-ready .reveal { transition: opacity var(--reveal-duration) ease, transform var(--reveal-duration) ease; }
.reveal.shown { opacity: 1; transform: none; }
/* 首屏保持已确认稿的尺寸、网格、窗口比例。 */
.hero {
  position: relative;
  isolation: isolate;
  overflow-x: clip;
  min-height: calc(100vh - var(--nav-h));
  min-height: calc(100svh - var(--nav-h));
  display: grid;
  align-content: center;
  padding: 28px var(--gutter) 36px;
}
.hero__copy { min-width: 0; text-align: center; max-width: var(--container); margin: 0 auto; width: 100%; }
.badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  max-width: 100%;
  padding: 5px 14px 5px 11px;
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  background: var(--bg);
  color: var(--muted);
  box-shadow: var(--shadow-edge);
  font-size: 13px;
  line-height: 18px;
  overflow-wrap: anywhere;
}
.badge code { font-size: 12.5px; color: var(--text); }
.pulse { position: relative; width: 7px; height: 7px; flex-shrink: 0; border-radius: var(--r-circle); background: var(--success); }
.pulse::after { content: ""; position: absolute; inset: -4px; border-radius: var(--r-circle); background: var(--success); opacity: .35; transform: scale(.4); animation: breathe 2.4s ease-in-out infinite; }
@keyframes breathe { 0% { transform: scale(.4); opacity: .4; } 70%, 100% { transform: scale(1); opacity: 0; } }
.h1-sep { color: var(--border-strong); margin: 0 .12em; }
.grad-word { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: var(--clear); white-space: nowrap; }
.lead { margin: 0 auto 26px; max-width: 780px; font-size: 17px; line-height: 27px; color: var(--muted); }
.lead strong { color: var(--text); }
.cta { display: flex; justify-content: center; flex-wrap: wrap; gap: 14px; margin-bottom: 20px; }
.platforms { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px 26px; margin: 0 auto 28px; padding: 0; list-style: none; }
.platforms a { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; line-height: 22px; color: var(--muted); text-decoration: none; transition: color var(--ease); }
.platforms a:hover { color: var(--text); }
.platforms svg { width: 15px; height: 15px; flex-shrink: 0; }
.stage { position: relative; max-width: var(--container); margin: 0 auto; width: 100%; min-width: 0; }
.stage::before {
  content: ""; position: absolute; z-index: -2; pointer-events: none;
  top: -150px; bottom: -140px; left: 50%; width: 100vw; transform: translateX(-50%);
  background-image: linear-gradient(to right, var(--panel-2) 0 1px, var(--clear) 1px);
  background-size: 280px 100%; background-position: calc(50% - 140px) 0;
  mask-image: linear-gradient(to bottom, var(--clear) 0, var(--mask-ink) 22%, var(--mask-ink) 72%, var(--clear) 100%);
  -webkit-mask-image: linear-gradient(to bottom, var(--clear) 0, var(--mask-ink) 22%, var(--mask-ink) 72%, var(--clear) 100%);
}
.stage::after { content: ""; position: absolute; z-index: -1; pointer-events: none; left: -180px; bottom: -120px; width: 640px; height: 440px; background: radial-gradient(closest-side, var(--glow), var(--clear)); }
.facts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0 0 26px; padding: 0; list-style: none; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.facts li { display: flex; align-items: center; justify-content: center; gap: 10px; min-height: 34px; padding: 4px; font-family: var(--font-mono); font-size: 12px; }
.facts li + li { border-left: 1px solid var(--panel-2); }
.facts .k { color: var(--muted); }
.facts .v { color: var(--text); }
.facts .v::before { content: ""; display: inline-block; width: 5px; height: 5px; margin-right: 8px; border-radius: 1px; background: var(--grad); vertical-align: 2px; }
.factsec { padding: 104px var(--gutter) 120px; }
.factsec__in { max-width: var(--container); margin: 0 auto; }
.factsec h2 { margin-bottom: 12px; text-align: center; }
.factsec__lead { margin: 0 auto 56px; max-width: 640px; text-align: center; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.card { min-height: 280px; border-radius: var(--r); display: grid; place-content: center; text-align: center; gap: 6px; padding: 32px 24px; color: var(--on-accent); }
.card__v { font-family: var(--font-display); font-weight: var(--weight-heading); font-size: 44px; line-height: 1.1; letter-spacing: -.01em; }
.card__l { font-size: 16px; }
.card__s { font-family: var(--font-mono); font-size: 12px; }
.card--dots { background-color: var(--accent); color: var(--on-accent); background-image: radial-gradient(var(--on-accent-dot) 1px, var(--clear) 1.5px); background-size: 22px 22px; background-position: 11px 11px; }
.card--lines { background-color: var(--leaf); color: var(--text); background-image: repeating-linear-gradient(28deg, var(--clear) 0 120px, var(--on-accent-line) 120px 121px), repeating-linear-gradient(-28deg, var(--clear) 0 120px, var(--on-accent-line) 120px 121px), linear-gradient(to right, var(--clear) calc(50% - .5px), var(--on-accent-line) calc(50% - .5px) calc(50% + .5px), var(--clear) calc(50% + .5px)); }
.card--grid { background-color: var(--pine); color: var(--on-accent); background-image: linear-gradient(to right, var(--on-accent-grid) 1px, var(--clear) 1px), linear-gradient(to bottom, var(--on-accent-grid) 1px, var(--clear) 1px); background-size: 64px 64px; background-position: -1px -1px; }
@media (max-width: 1280px) {
  .topbar__in { gap: 16px; }
  .nav a { padding-inline: 10px; }
  html:not([lang="zh-CN"]):not([lang="zh-TW"]) .nav { display: none; }
  html:not([lang="zh-CN"]):not([lang="zh-TW"]) .header-tools { margin-left: auto; }
  html:not([lang="zh-CN"]):not([lang="zh-TW"]) .menu-toggle { display: inline-flex; }
}
@media (max-width: 1100px) {
  .nav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
}
.mobile-nav:not([hidden]) {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 3;
  max-height: calc(100dvh - var(--nav-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 12px var(--gutter) 24px;
  background: var(--bg);
  color: var(--text);
  border-bottom: 1px solid var(--border);
}
.mobile-nav ul { list-style: none; padding: 0; margin: 0; }
.mobile-nav a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 14px; text-decoration: none; border-radius: var(--r); }
.mobile-nav a:hover, .mobile-nav a[aria-current] { background: var(--panel); color: var(--text); }
.mobile-nav .mobile-languages { border-top: 1px solid var(--border); margin-top: 12px; padding-top: 12px; }
@media (max-width: 900px) {
  .hero { min-height: auto; padding-top: 36px; padding-bottom: 56px; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .facts li:nth-child(3) { border-left: 0; }
  .facts li:nth-child(n+3) { border-top: 1px solid var(--panel-2); }
  .cards { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  h1 { font-size: 28px; }
  .grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; --section-space: 56px; }
  h1 { font-size: 28px; }
  h1 .grad-word { white-space: normal; }
  .topbar__in { gap: 8px; }
  .brand__name { font-size: 16px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .lang { padding-inline: 10px; }
  .header-tools { margin-left: auto; gap: 6px; }
  .h1-brand { display: block; }
  .h1-sep { display: none; }
  .lead { font-size: 15.5px; line-height: 25px; }
  .cta { flex-direction: column; align-items: stretch; max-width: 320px; margin-inline: auto; }
  .platforms { gap: 8px 18px; }
  .facts li { gap: 6px; font-size: 10px; }
  .facts .v::before { margin-right: 4px; }
  .factsec { padding-top: 72px; padding-bottom: 88px; }
  .footer-grid { gap: 28px 20px; }
  .footer-brand { grid-column: 1 / -1; }
  .panel, .surface-card { padding: 20px; }
  .tilt, [data-tilt] { transform: none !important; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .pulse::after { animation: none; opacity: 0; }
  .btn, .nav a, .platforms a, html.reveal-ready .reveal { transition: none; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}