:root {
  --bg: #fdfdfb;
  --panel: #ffffff;
  --panel-2: #f5f5f2;
  --border: #e6e6e1;
  --grid: #efefea;
  --accent: #7cc96a;
  --accent-hover: #71bf5f;
  --accent-dark: #1f5d3a;
  --accent-soft: #dcf0d4;
  --pink: #f3c6ee;
  --honey: #fbd98a;
  --sky: #b5dcfb;
  --ink: #1f2e28;
  --muted: #5d6a64;
  --success: #2f9e5a;
  --warn: #c98a12;
  --error: #d1433f;
  --mask: #000000;
  --clear: transparent;
  --veil: rgba(31,46,40,.22);
  --shadow-hair: 0 1px 2px rgba(31,46,40,.04);
  --shadow-tile: 0 1px 2px rgba(31,46,40,.05),0 10px 22px -10px rgba(31,46,40,.18);
  --shadow-card: 0 8px 24px rgba(31,46,40,.06);
  --shadow-float: 0 1px 2px rgba(31,46,40,.06),0 18px 36px -14px rgba(31,46,40,.24);
  --shadow-cta: inset 0 1px 0 rgba(255,255,255,.45),0 1px 2px rgba(31,93,58,.18),0 12px 24px -12px rgba(47,158,90,.6);
  --ring-dot: 0 0 0 4px var(--accent-soft);
  --r-card: 32px;
  --r-canvas: 24px;
  --r-tile: 14px;
  --r-pill: 999px;
  --r-shot: 8px;
  --r-brand: 50%;
  --font-display: "Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body: "Inter","Noto Sans SC",-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono: "JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --weight-body: 400;
  --weight-medium: 500;
  --weight-strong: 600;
  --weight-heading: 700;
  --text-xs: 13px;
  --text-sm: 14px;
  --text-body: 16px;
  --text-lede: 17px;
  --text-h3: 24px;
  --text-h2: clamp(26px,3vw,36px);
  --text-h1: clamp(34px,2.4vw + 14px,48px);
  --leading-body: 1.6;
  --leading-copy: 1.8;
  --leading-title: 1.16;
  --tracking-title: -.02em;
  --tracking-label: .14em;
  --gutter: 24px;
  --reading-width: 820px;
  --content-width: 1264px;
  --header-width: 1312px;
  --cell: 64px;
  --nav-h: 68px;
  --section-space: 88px;
  --motion-fast: .2s;
  --motion-reveal: .6s;
  --ease: ease;
  --z-header: 40;
  --z-veil: 35;
  --z-fab: 30;
}
*, *::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(--ink);
  font: var(--weight-body) var(--text-body)/var(--leading-body) var(--font-body);
  -webkit-font-smoothing: antialiased;
}
main, section, article, aside, nav, header, footer, div, li { min-width: 0; }
img { max-width: 100%; }
svg { flex-shrink: 0; }
button, input, select, textarea { font: inherit; }
button, summary, a { -webkit-tap-highlight-color: var(--clear); }
button { cursor: pointer; }
a { color: inherit; text-underline-offset: .2em; }
a:hover { text-decoration-color: var(--accent-dark); }
:focus-visible { outline: 2px solid var(--accent-dark); outline-offset: 3px; }
[hidden] { display: none !important; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-heading);
  line-height: 1.3;
  letter-spacing: var(--tracking-title);
  text-wrap: balance;
}
h1 { font-size: var(--text-h1); line-height: var(--leading-title); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
p { margin-top: 0; }
strong { font-weight: var(--weight-strong); }
code, pre, kbd { font-family: var(--font-mono); }
code { 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-tile);
  background: var(--panel-2);
  color: var(--ink);
  line-height: 1.8;
  -webkit-overflow-scrolling: touch;
}
pre code { white-space: pre; overflow-wrap: normal; word-break: normal; }
hr { border: 0; border-top: 1px solid var(--border); margin-block: 32px; }
.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: calc(var(--reading-width) + var(--gutter) * 2); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section-heading { max-width: 760px; margin-bottom: 32px; }
.section-heading h2 { margin-block: 8px 16px; }
.muted, .lede { color: var(--muted); }
.lede { font-size: var(--text-lede); line-height: 1.75; }
.keep { white-space: nowrap; }
.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 20px;
  border-radius: var(--r-pill);
  background: var(--accent);
  color: var(--ink);
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; }
.icon {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  max-width: 100%;
  padding: 12px 26px;
  border: 1px solid var(--clear);
  border-radius: var(--r-pill);
  font: var(--weight-strong) var(--text-body)/1.35 var(--font-body);
  text-align: center;
  text-decoration: none;
  transition: transform var(--motion-fast) var(--ease),background-color var(--motion-fast) var(--ease),border-color var(--motion-fast) var(--ease);
}
.btn svg { width: 18px; height: 18px; }
.btn-primary { background: var(--accent); color: var(--ink); box-shadow: var(--shadow-cta); }
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-hover); color: var(--ink); transform: translateY(-1px); }
.btn-primary:active { transform: none; box-shadow: var(--shadow-hair); }
.btn-ghost { background: var(--panel); color: var(--ink); border-color: var(--border); box-shadow: var(--shadow-hair); }
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--panel-2); color: var(--muted); border-color: var(--border); box-shadow: none; cursor: not-allowed; transform: none; }
.text-link, .feat-link {
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
  font-weight: var(--weight-strong);
}
.text-link:hover, .feat-link:hover { color: var(--accent-dark); }
.card, .panel, .feat {
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: var(--r-card);
  box-shadow: var(--shadow-card);
}
.card, .panel { padding: 32px; }
.grid-two { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
.prose { line-height: var(--leading-copy); }
.prose h2 { margin-top: 56px; margin-bottom: 20px; }
.prose h3 { margin-top: 32px; margin-bottom: 16px; }
.prose p, .prose ul, .prose ol { margin-bottom: 20px; }
.prose li + li { margin-top: 8px; }
.prose a { text-decoration-color: var(--accent); }
.prose :is(h2,h3,h4)[id], section[id], article[id] { scroll-margin-top: calc(var(--nav-h) + 24px); }
.decorated, .hero, .canvas { position: relative; overflow-x: clip; }
.eyebrow { margin: 0; font-size: var(--text-xs); font-weight: var(--weight-strong); letter-spacing: var(--tracking-label); color: var(--accent-dark); }
#site-header, .masthead { position: sticky; top: 0; z-index: var(--z-header); background: var(--panel); color: var(--ink); border-bottom: 1px solid var(--border); }
.masthead-row {
  position: relative;
  min-height: var(--nav-h);
  max-width: min(100%,calc(var(--header-width) + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: 32px;
  display: flex;
  align-items: center;
  gap: 20px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; margin-right: auto; flex-shrink: 0; text-decoration: none; font-weight: var(--weight-heading); font-size: var(--text-body); letter-spacing: -.01em; }
.brand-logo, .brand-slot { display: block; width: 32px; height: 32px; flex-shrink: 0; border-radius: var(--r-brand); }
.brand-slot { background: var(--panel-2); color: var(--ink); border: 1px solid var(--border); box-shadow: var(--shadow-hair); }
.primary-nav { min-width: 0; }
.primary-nav ul { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.primary-nav a { display: inline-flex; align-items: center; gap: 7px; min-height: 36px; padding: 6px 12px; border-radius: var(--r-pill); color: var(--muted); font-size: var(--text-sm); font-weight: var(--weight-medium); text-decoration: none; white-space: nowrap; }
.primary-nav svg, .lang-switch svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { background: var(--panel-2); color: var(--ink); }
.primary-nav a[aria-current="page"] svg { color: var(--accent-dark); }
.header-tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; margin-left: auto; }
.language-control { position: relative; }
.lang-switch { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 36px; padding: 8px 14px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--panel); color: var(--muted); font-size: var(--text-sm); font-weight: var(--weight-medium); white-space: nowrap; text-decoration: none; }
.lang-switch:hover { border-color: var(--accent); color: var(--ink); }
.lang-caret { font-size: 11px; }
.language-menu { position: absolute; top: calc(100% + 12px); right: 0; min-width: 190px; padding: 8px; margin: 0; list-style: none; border: 1px solid var(--border); border-radius: var(--r-tile); background: var(--panel); color: var(--ink); box-shadow: var(--shadow-float); }
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 10px 14px; border-radius: var(--r-tile); text-decoration: none; }
.language-menu a:hover, .language-menu a[aria-current] { background: var(--panel-2); color: var(--ink); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 10px; border: 1px solid var(--border); border-radius: var(--r-pill); background: var(--panel); color: var(--ink); }
.mobile-drawer { display: none; }
.menu-veil { position: fixed; inset: var(--nav-h) 0 0; z-index: var(--z-veil); border: 0; background: var(--veil); color: var(--ink); }
.site-footer { border-top: 1px solid var(--border); background: var(--panel); color: var(--ink); padding-top: 64px; padding-bottom: 88px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1.3fr 1fr; gap: 40px; }
.footer-brand .brand { margin-bottom: 20px; }
.footer-brand p { max-width: 340px; color: var(--muted); font-size: var(--text-sm); line-height: 1.8; }
.footer-title { margin: 0 0 14px; font-size: var(--text-sm); font-weight: var(--weight-strong); }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links a { display: inline-block; padding-block: 6px; font-size: var(--text-sm); color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--accent-dark); text-decoration: underline; }
.footer-bottom { display: flex; flex-wrap: wrap; gap: 12px 24px; margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); font-size: var(--text-xs); color: var(--muted); }
.footer-bottom p { margin: 0; }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal { opacity: 0; transform: translateY(16px); transition: opacity var(--motion-reveal) var(--ease),transform var(--motion-reveal) var(--ease); }
html.reveal-ready .reveal.shown { opacity: 1; transform: none; }
@media (max-width: 1200px) {
  .primary-nav { display: none; }
  .menu-toggle { display: inline-flex; }
  .header-tools { margin-left: auto; }
  .mobile-drawer {
    position: absolute;
    display: block;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100dvh - var(--nav-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 16px var(--gutter) 24px;
    border-bottom: 1px solid var(--border);
    background: var(--panel);
    color: var(--ink);
    box-shadow: var(--shadow-card);
  }
  .mobile-drawer ul { list-style: none; margin: 0; padding: 0; }
  .mobile-drawer a { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 48px; padding: 12px 16px; border-radius: var(--r-tile); text-decoration: none; }
  .mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--panel-2); color: var(--ink); }
  .mobile-drawer .drawer-label { margin: 16px 16px 8px; color: var(--muted); font-size: var(--text-xs); }
  .mobile-drawer .icon { width: 18px; height: 18px; }
}
@media (max-width: 768px) {
  :root { --gutter: 20px; --section-space: 56px; --text-h1: 28px; --text-h2: 26px; }
  .masthead-row { padding-inline: var(--gutter); gap: 8px; }
  .grid-two { grid-template-columns: minmax(0,1fr); }
  .footer-grid { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 32px 24px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .card, .panel { padding: 24px; }
  .brand { gap: 8px; font-size: var(--text-sm); }
  .masthead-row > .brand { min-width: 0; flex-shrink: 1; }
  .masthead-row > .brand > span { min-width: 0; overflow-wrap: anywhere; }
  .lang-switch { padding-inline: 10px; }
  .lang-switch svg { display: none; }
  .tilt, [class*="tilt-"] { transform: none !important; }
  .footer-grid { grid-template-columns: minmax(0,1fr); }
  .footer-brand { grid-column: auto; }
  .site-footer { padding-bottom: 96px; }
  .keep { max-width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-ready .reveal { opacity: 1; transform: none; }
  .btn:hover { transform: none; }
}