:root {
  --c-field: #3A57FB;
  --c-field-deep: #2A44E8;
  --c-field-deeper: #1C30B5;
  --c-paper: var(--c-field);
  --c-paper-2: #304BE3;
  --c-rule: rgba(255, 255, 255, 0.24);
  --c-rule-strong: rgba(255, 255, 255, 0.48);
  --c-link: #FFFFFF;
  --c-link-hover: #B9F3FF;
  --c-contrast-ink: #101833;
  --c-orange: #FF9433;
  --c-orange-deep: #E0731A;
  --c-cyan: #3FD6F5;
  --c-ink: #FFFFFF;
  --c-ink-muted: #E0E6FF;
  --c-success: #1FB57A;
  --c-warn: #F2B01E;
  --c-error: #E5484D;
  --c-on: #FFFFFF;
  --c-on-muted: rgba(255, 255, 255, 0.78);
  --c-on-soft: rgba(255, 255, 255, 0.58);
  --c-on-line: rgba(255, 255, 255, 0.24);
  --c-on-edge: rgba(255, 255, 255, 0.72);
  --c-on-fill: rgba(255, 255, 255, 0.10);
  --c-on-fill-hover: rgba(255, 255, 255, 0.16);
  --c-transparent: rgba(255, 255, 255, 0);
  --shadow-window: 0 1px 2px rgba(16, 24, 51, 0.10), 0 26px 52px -20px rgba(16, 24, 51, 0.46);
  --shadow-frame: 0 34px 70px -34px rgba(16, 24, 51, 0.50);
  --shadow-hair: 0 1px 2px rgba(16, 24, 51, 0.06);
  --r-ctl: 4px;
  --r-card: 8px;
  --r-frame: 12px;
  --r-round: 999px;
  --f-display: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --f-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --gutter: 24px;
  --w-content: 1240px;
  --w-rail: min(84vw, 1240px);
  --spill: 138px;
  --header-height: 64px;
  --s-section: 96px;
  --s-card: 24px;
  --t-fast: 150ms;
  --t-reveal: 550ms;
  --weight-normal: 400;
  --weight-medium: 500;
}
*, *::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(--c-paper);
  color: var(--c-ink);
  font-family: var(--f-body);
  font-weight: var(--weight-normal);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
img, svg { max-width: 100%; vertical-align: middle; }
img { height: auto; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: var(--c-transparent); }
button { cursor: pointer; }
a { color: var(--c-link); text-underline-offset: 4px; }
a:hover { color: var(--c-link-hover); }
:focus-visible { outline: 2px solid var(--c-link); outline-offset: 4px; }
.topbar :focus-visible, .site-footer :focus-visible, .hero :focus-visible { outline-color: var(--c-on); }
h1, h2, h3, h4 { font-family: var(--f-display); font-weight: var(--weight-normal); text-wrap: balance; }
h1 { font-size: clamp(34px, 3.2vw, 48px); line-height: 1.12; letter-spacing: -0.02em; }
h2 { font-size: clamp(24px, 2.6vw, 32px); line-height: 1.25; letter-spacing: -0.015em; }
h3 { font-size: 22px; line-height: 1.4; }
p { margin-top: 0; }
strong { font-weight: var(--weight-medium); }
code { font-family: var(--f-mono); font-size: 0.88em; overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 20px;
  border-radius: var(--r-ctl);
  background: var(--c-contrast-ink);
  color: var(--c-on);
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.75;
  tab-size: 2;
}
pre code { font-size: inherit; overflow-wrap: normal; word-break: normal; white-space: pre; }
pre .key { color: var(--c-cyan); }
section, article, aside, main, nav, .grid > *, .card-grid > *, .settings-tabs > *, .footer-grid > * { min-width: 0; }
section[id], h2[id], h3[id] { scroll-margin-top: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.keep { white-space: nowrap; }
.wrap { width: 100%; max-width: calc(var(--w-content) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.rail { width: calc(var(--w-rail) + var(--gutter) * 2); max-width: 100%; padding-inline: var(--gutter); margin-inline: auto; }
.reading { max-width: 820px; }
.section { padding-top: var(--s-section); padding-bottom: var(--s-section); }
.section-muted { background: var(--c-paper-2); color: var(--c-ink); }
.muted, .crumb { color: var(--c-ink-muted); }
.crumb { margin: 0; font-family: var(--f-mono); font-size: 12.5px; }
.grid, .card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.card, .panel { min-width: 0; padding: var(--s-card); border: 1px solid var(--c-rule); border-radius: var(--r-card); background: var(--c-paper); color: var(--c-ink); box-shadow: var(--shadow-hair); }
.card h3, .panel h3 { margin-top: 0; }
.card > :last-child, .panel > :last-child { margin-bottom: 0; }
.prose { min-width: 0; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.7em; }
.prose p, .prose li { overflow-wrap: break-word; }
.prose img { max-width: 100%; }
.prose li + li { margin-top: 8px; }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; transition: opacity var(--t-reveal) ease, transform var(--t-reveal) ease; }
.btn {
  display: inline-flex; justify-content: center; align-items: center; gap: 9px;
  min-height: 46px; padding: 9px 24px; border: 0; border-radius: var(--r-ctl);
  font-size: 15.5px; line-height: 1.5; font-weight: var(--weight-medium); letter-spacing: 0.005em;
  text-decoration: none; transition: background-color var(--t-fast) ease, color var(--t-fast) ease;
}
.btn svg { width: 17px; height: 17px; flex-shrink: 0; }
.btn-get { background: var(--c-orange); color: var(--c-contrast-ink); }
.btn-get:hover, .btn-get.is-hover { background: var(--c-orange-deep); color: var(--c-contrast-ink); }
.btn-read { background: var(--c-transparent); color: var(--c-on); box-shadow: inset 0 0 0 1.5px var(--c-on-edge); }
.btn-read:hover { background: var(--c-on-fill-hover); color: var(--c-on); }
.btn-outline { background: var(--c-paper); color: var(--c-link); box-shadow: inset 0 0 0 1px var(--c-rule-strong); }
.btn-outline:hover { background: var(--c-paper-2); color: var(--c-link); }
.btn:active { box-shadow: inset 0 0 0 2px var(--c-ink); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--c-paper-2); color: var(--c-ink-muted); box-shadow: inset 0 0 0 1px var(--c-rule); cursor: not-allowed; }
.btn.is-focus { outline: 2px solid var(--c-field); outline-offset: 4px; }
.topbar { position: relative; z-index: 30; background: var(--c-field); color: var(--c-on); }
.topbar-row {
  position: relative; display: flex; align-items: center; gap: 24px;
  width: 100%; max-width: min(100%, calc(1280px + var(--gutter) * 2));
  min-height: var(--header-height); margin-inline: auto; padding-inline: var(--gutter);
}
.brandmark { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; color: var(--c-on); font-family: var(--f-display); font-size: 16px; font-weight: var(--weight-medium); line-height: 1.3; letter-spacing: -0.01em; text-decoration: none; }
.brandmark:hover { color: var(--c-on); }
.brandmark img { width: 30px; height: 30px; flex-shrink: 0; }
.dotnav { margin-left: auto; min-width: 0; }
.dotnav ul { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; font-size: 14.5px; }
.dotnav li { display: flex; align-items: center; flex-shrink: 0; }
.dotnav li + li::before { content: "·"; margin: 0 14px; color: var(--c-on-soft); }
.dotnav a { position: relative; display: inline-block; padding: 6px 0; color: var(--c-on-muted); text-decoration: none; }
.dotnav a:hover, .dotnav a:focus-visible { color: var(--c-cyan); }
.dotnav a[aria-current="page"] { color: var(--c-on); }
.dotnav a[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; background: var(--c-orange); }
.header-tools { display: flex; align-items: center; flex-shrink: 0; gap: 8px; }
.language-control { position: relative; }
.lang-pick { display: inline-flex; align-items: center; gap: 7px; min-height: 44px; padding: 4px 0 4px 22px; border: 0; border-left: 1px solid var(--c-on-line); background: var(--c-transparent); color: var(--c-on-muted); font-size: 14px; white-space: nowrap; }
.lang-pick:hover { color: var(--c-cyan); }
.lang-pick svg { width: 15px; height: 15px; flex-shrink: 0; }
.lang-short { display: none; }
.language-menu { position: absolute; top: 100%; right: 0; width: 190px; padding: 8px; border: 1px solid var(--c-rule); border-radius: var(--r-card); background: var(--c-paper); color: var(--c-ink); box-shadow: var(--shadow-hair); }
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; color: var(--c-ink); text-decoration: none; }
.language-menu a:hover, .language-menu a[aria-current] { background: var(--c-paper-2); color: var(--c-link); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; border: 1px solid var(--c-on-line); border-radius: var(--r-ctl); background: var(--c-transparent); color: var(--c-on); }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-drawer { display: none; position: absolute; z-index: 32; top: 100%; left: 0; right: 0; max-height: calc(100dvh - var(--header-height)); padding: 16px var(--gutter); overflow-y: auto; overscroll-behavior: contain; background: var(--c-field); color: var(--c-on); border-top: 1px solid var(--c-on-line); }
.mobile-drawer ul { margin: 0; padding: 0; list-style: none; }
.mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 12px; color: var(--c-on); text-decoration: none; }
.mobile-drawer a:hover { color: var(--c-cyan); }
.mobile-drawer a[aria-current="page"] { text-decoration: underline; text-decoration-color: var(--c-orange); text-decoration-thickness: 2px; }
.drawer-languages { margin-top: 16px; border-top: 1px solid var(--c-on-line); padding-top: 12px; }
.nav-veil { position: fixed; z-index: 20; inset: var(--header-height) 0 0; width: 100%; border: 0; background: var(--c-on-line); color: var(--c-ink); }
.hero { display: flow-root; overflow-x: clip; background: var(--c-field); color: var(--c-on); text-align: center; padding-top: 40px; }
.tagrow { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.tag { display: inline-flex; align-items: center; gap: 7px; max-width: 100%; padding: 5px 11px; border-radius: var(--r-ctl); background: var(--c-on-fill); color: var(--c-on); font-size: 12.5px; line-height: 16px; overflow-wrap: anywhere; }
.tag-live::before { content: ""; width: 6px; height: 6px; flex-shrink: 0; border-radius: var(--r-round); background: var(--c-cyan); box-shadow: 0 0 0 3px var(--c-on-fill); }
.hero-title { margin: 20px auto 0; font-size: clamp(30px, 3.2vw, 48px); line-height: 1.1; }
.hero-title .ln { display: block; }
.hero-title .hot { color: var(--c-orange); }
.hero-lead { max-width: 720px; margin: 18px auto 0; color: var(--c-on-muted); font-size: 16.5px; line-height: 1.65; }
.hero-lead strong { color: var(--c-on); }
.cta-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.osrow { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 26px; margin: 20px 0 0; padding: 0; list-style: none; font-size: 13.5px; }
.osrow-label { color: var(--c-on-muted); font-family: var(--f-mono); font-size: 12px; letter-spacing: 0.02em; }
.osrow a { display: inline-flex; align-items: center; gap: 7px; color: var(--c-on-muted); text-decoration: none; }
.osrow a:hover { color: var(--c-cyan); }
.osrow svg { width: 15px; height: 15px; flex-shrink: 0; }
.factband { margin-top: 26px; border-top: 1px solid var(--c-on-line); border-bottom: 1px solid var(--c-on-line); }
.factband dl { display: flex; margin-block: 0; font-family: var(--f-mono); font-size: 12.5px; line-height: 18px; }
.fact { flex: 1 1 auto; display: flex; justify-content: center; gap: 9px; padding: 11px 18px; }
.fact + .fact { border-left: 1px solid var(--c-on-line); }
.fact dt { color: var(--c-on-muted); }
.fact dd { margin: 0; color: var(--c-on); }
.after-hero { background: var(--c-paper); color: var(--c-ink); padding-top: calc(var(--spill) + 96px); padding-bottom: 96px; }
.after-hero h2 { margin: 12px 0 0; }
.after-hero .note { max-width: 640px; margin: 14px 0 0; color: var(--c-ink-muted); font-size: 15.5px; line-height: 1.7; }
.site-footer { background: var(--c-field); color: var(--c-on); padding-top: 64px; padding-bottom: 32px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.7fr 1.4fr 0.7fr; gap: 40px; }
.footer-grid h2 { margin: 0 0 16px; font-size: 15px; }
.footer-grid p { margin-top: 16px; color: var(--c-on-muted); font-size: 14px; }
.footer-grid ul { margin: 0; padding: 0; list-style: none; }
.footer-grid a:not(.brandmark), .footer-bottom a { display: inline-block; padding-block: 5px; color: var(--c-on-muted); font-size: 14px; text-decoration: none; }
.footer-grid a:hover, .footer-bottom a:hover { color: var(--c-cyan); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--c-on-line); color: var(--c-on-muted); font-size: 13px; }
@media (max-width: 1279px) {
  .topbar-row { gap: 12px; }
  .topbar .dotnav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer.is-open { display: block; }
}
@media (max-width: 1080px) {
  .factband dl { flex-wrap: wrap; }
  .fact { flex: 1 1 33%; }
  .fact + .fact { border-left: 0; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  :root { --w-rail: 92vw; --spill: 72px; --s-section: 64px; }
  .hero { padding-top: 28px; }
  .hero-title { font-size: clamp(24px, 4vw, 30px); line-height: 1.15; }
  .hero-lead { font-size: 15px; }
  .osrow { gap: 14px 20px; }
  .osrow-label { flex-basis: 100%; }
  .fact { flex: 1 1 100%; justify-content: flex-start; padding: 8px 4px; }
  .fact + .fact { border-top: 1px solid var(--c-on-line); }
  .grid, .card-grid { grid-template-columns: 1fr; }
  .after-hero h2 { font-size: 24px; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; --s-card: 20px; }
  h1 { font-size: clamp(24px, 6vw, 30px); }
  .rail { width: 100%; }
  .brandmark { font-size: 13px; gap: 7px; }
  .brandmark img { width: 26px; height: 26px; }
  .header-tools { margin-left: auto; gap: 4px; }
  .lang-pick { padding-left: 8px; gap: 4px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .topbar-row { gap: 6px; }
  .tilt, [data-tilt] { transform: none !important; }
  .hero-title { font-size: 24px; }
  .tagrow { gap: 6px; }
  .tag { padding: 4px 8px; font-size: 11.5px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}