:root {
  --bg: #FFFFFF;
  --bg-panel: #F5F7FB;
  --bg-panel2: #ECEFF5;
  --border: #E2E6EE;
  --accent: #0A84FF;
  --accent-dark: #0A3FB8;
  --text: #0B1533;
  --text-muted: #5A6478;
  --success: #1DA266;
  --warn: #E08A00;
  --error: #E5484D;
  --field-ink: #0B1430;
  --field-mist: #BFD9FF;
  --card-light: #DCEBFF;
  --coral: #FF7A59;
  --amber: #FFB547;
  --on-dark: #FFFFFF;
  --code-bg: #0B1533;
  --code-bar: #141F44;
  --code-punct: #7D89A6;
  --dot-close: #FF5F57;
  --dot-min: #FEBC2E;
  --dot-max: #28C840;
  --white-rgb: 255, 255, 255;
  --ink-rgb: 11, 21, 51;
  --field-ink-rgb: 11, 20, 48;
  --accent-rgb: 10, 132, 255;
  --transparent: transparent;
  --grad-warm: linear-gradient(90deg, var(--coral) 0%, var(--amber) 100%);
  --font-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans', 'Hiragino Sans GB', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Microsoft YaHei', system-ui, sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Hiragino Sans', 'Hiragino Sans GB', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Microsoft YaHei', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-strong: 600;
  --fs-h1: clamp(34px, 3.2vw, 46px);
  --fs-h2: clamp(24px, 2.4vw, 32px);
  --fs-h3: 20px;
  --fs-body: 16px;
  --fs-lead: 17px;
  --fs-small: 14px;
  --fs-caption: 12px;
  --r-card: 28px;
  --r-stage: 28px;
  --r-tile: 22px;
  --r-win: 14px;
  --r-field: 8px;
  --r-logo: 9px;
  --r-small: 6px;
  --r-check: 4px;
  --r-pill: 999px;
  --r-circle: 50%;
  --gutter: 40px;
  --reading-width: 1152px;
  --header-height: 68px;
  --section-space: 96px;
  --ease: 200ms ease;
  --reveal-duration: 550ms;
  --shadow-focus: 0 50px 90px -42px rgba(var(--ink-rgb), .42), 0 18px 40px -28px rgba(var(--ink-rgb), .2);
  --shadow-menu: 0 14px 30px -18px rgba(var(--ink-rgb), .3);
  --shadow-switch: 0 1px 2px rgba(var(--ink-rgb), .2);
  --shelf-card-w: 340px;
  --shelf-card-h: 380px;
  --shelf-focus-w: 356px;
  --shelf-focus-h: 412px;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 24px; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: var(--weight-normal) var(--fs-body)/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { display: block; max-width: 100%; height: auto; }
svg { display: block; flex-shrink: 0; }
a { color: var(--accent-dark); text-decoration-thickness: 1px; text-underline-offset: .22em; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, a, summary { -webkit-tap-highlight-color: var(--transparent); }
button:disabled, .btn[aria-disabled="true"] { cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 4px; }
[hidden] { display: none !important; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: var(--weight-medium); line-height: 1.25; text-wrap: balance; }
h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
p { margin-top: 0; }
strong { font-weight: var(--weight-strong); }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
:not(pre) > code {
  padding: 1px 6px;
  border-radius: var(--r-small);
  background: var(--bg-panel2);
  color: var(--text);
  font-size: .9em;
}
pre { max-width: 100%; min-width: 0; overflow-x: auto; padding: 24px; border-radius: var(--r-win); background: var(--code-bg); color: var(--field-mist); }
pre code { overflow-wrap: normal; word-break: normal; white-space: pre; }
hr { border: 0; border-top: 1px solid var(--border); margin-block: 32px; }
.wrap { width: 100%; max-width: calc(var(--reading-width) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section__head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 32px; }
.section__head h2 { margin: 0; }
.section__head p { margin: 12px 0 0; color: var(--text-muted); }
.keep { white-space: nowrap; }
.muted { color: var(--text-muted); }
.text-link { color: var(--accent-dark); font-weight: var(--weight-medium); }
.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 18px; background: var(--bg); color: var(--accent-dark); border-radius: var(--r-pill); transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.grid > *, .stage > *, .section__head > *, .prose > * { min-width: 0; }
.panel, .stage { background: var(--bg-panel); color: var(--text); border-radius: var(--r-stage); padding: 32px; }
.panel--second { background: var(--bg-panel2); color: var(--text); }
.tile { padding: 28px; background: var(--bg); color: var(--text); border-radius: var(--r-tile); min-width: 0; }
.tile h3 { margin: 0; font-size: 18px; }
.tile p { margin: 10px 0 0; font-size: 14.5px; color: var(--text-muted); }
.cta-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  display: inline-flex; justify-content: center; align-items: center; gap: 9px;
  min-height: 48px; padding: 10px 26px; max-width: 100%;
  border: 1px solid var(--transparent); border-radius: var(--r-pill);
  font-size: 15px; font-weight: var(--weight-medium); letter-spacing: .01em;
  line-height: 1.5; text-align: center; text-decoration: none;
  transition: background-color var(--ease), border-color var(--ease);
}
.btn svg { width: 18px; height: 18px; }
.btn--main { background: var(--accent); color: var(--on-dark); box-shadow: inset 0 1px 0 rgba(var(--white-rgb), .28), 0 0 0 1px rgba(var(--white-rgb), .16); }
.btn--main:hover, .btn--main.is-hover { background: var(--accent-dark); color: var(--on-dark); }
.btn--main:active, .btn--main.is-active { background: var(--accent-dark); color: var(--on-dark); box-shadow: inset 0 2px 3px rgba(var(--ink-rgb), .2); }
.btn--secondary { border-color: var(--border); background: var(--bg-panel); color: var(--accent-dark); }
.btn--secondary:hover { background: var(--bg-panel2); color: var(--accent-dark); }
.btn--ghost { border-color: rgba(var(--white-rgb), .34); background: rgba(var(--white-rgb), .12); color: var(--on-dark); }
.btn--ghost:hover { background: rgba(var(--white-rgb), .2); color: var(--on-dark); border-color: rgba(var(--white-rgb), .5); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--bg-panel2); border-color: var(--border); color: var(--text-muted); box-shadow: none; }
.btn.is-focus { outline: 3px solid var(--accent); outline-offset: 4px; }
.button-samples { display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.header-shell, #site-header { position: relative; z-index: 40; }
.topbar {
  position: relative; min-height: var(--header-height); padding-inline: var(--gutter);
  max-width: min(100%, calc(1280px + var(--gutter) * 2)); margin-inline: auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  color: var(--text);
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; color: inherit; text-decoration: none; font: var(--weight-medium) 16px/1.4 var(--font-display); letter-spacing: .01em; }
.brand__mark { width: 32px; height: 32px; flex-shrink: 0; border-radius: var(--r-logo); box-shadow: 0 0 0 1px rgba(var(--white-rgb), .22); }
.desktop-nav { min-width: 0; margin-left: auto; }
.dotnav { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; font-size: var(--fs-small); }
.dotnav li { display: flex; align-items: center; flex-shrink: 0; }
.dotnav li + li::before { content: "·"; margin-inline: 12px; color: var(--text-muted); }
.dotnav a { position: relative; color: var(--text-muted); text-decoration: none; white-space: nowrap; }
.dotnav a:hover, .dotnav a[aria-current="page"] { color: var(--accent-dark); }
.dotnav a[aria-current="page"] { font-weight: var(--weight-medium); }
.dotnav a[aria-current="page"]::after { content: ""; position: absolute; left: 0; right: 0; bottom: -7px; height: 2px; border-radius: var(--r-pill); background: var(--accent); }
.topbar__tools { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.language { position: relative; }
.lang {
  display: inline-flex; align-items: center; gap: 7px; min-height: 34px; padding: 6px 14px;
  border: 1px solid var(--border); border-radius: var(--r-pill);
  background: var(--bg); color: var(--text); font-size: 13px;
  white-space: nowrap; text-decoration: none; list-style: none;
}
.lang::-webkit-details-marker { display: none; }
.lang svg { width: 15px; height: 15px; }
.lang__caret { font-size: 10px; opacity: .8; }
.lang__short { display: none; }
.language__menu { position: absolute; top: calc(100% + 10px); right: 0; width: 190px; padding: 8px; border: 1px solid var(--border); border-radius: var(--r-win); background: var(--bg); color: var(--text); box-shadow: var(--shadow-menu); z-index: 45; }
.language__menu a { display: flex; align-items: center; min-height: 44px; padding: 10px 14px; border-radius: var(--r-field); color: var(--text); text-decoration: none; }
.language__menu a:hover, .language__menu a[aria-current="true"] { background: var(--bg-panel); color: var(--accent-dark); }
.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-pill); background: var(--bg); color: var(--text); }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-drawer { position: absolute; top: 100%; left: 0; right: 0; padding: 16px var(--gutter) 24px; max-height: calc(100dvh - var(--header-height)); overflow-y: auto; overscroll-behavior: contain; background: var(--bg); color: var(--text); border-bottom: 1px solid var(--border); z-index: 44; }
.mobile-drawer ul { list-style: none; padding: 0; margin: 0; }
.mobile-drawer a { display: flex; width: 100%; align-items: center; min-height: 44px; padding: 12px 16px; text-decoration: none; color: var(--text); border-radius: var(--r-field); }
.mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--bg-panel); color: var(--accent-dark); }
.mobile-drawer__label { margin: 20px 16px 8px; font-size: var(--fs-caption); color: var(--text-muted); }
.nav-veil { position: fixed; inset: 0; z-index: 30; border: 0; background: rgba(var(--ink-rgb), .35); color: var(--on-dark); cursor: default; }
.header--light-on-dark .topbar, .lux .topbar { color: var(--on-dark); }
.header--light-on-dark .dotnav a, .lux .dotnav a { color: rgba(var(--white-rgb), .78); }
.header--light-on-dark .dotnav a:hover, .header--light-on-dark .dotnav a[aria-current], .lux .dotnav a:hover, .lux .dotnav a[aria-current] { color: var(--on-dark); }
.header--light-on-dark .dotnav li + li::before, .lux .dotnav li + li::before { color: rgba(var(--white-rgb), .42); }
.header--light-on-dark .dotnav a[aria-current]::after, .lux .dotnav a[aria-current]::after { background: var(--field-mist); }
.header--light-on-dark .lang, .lux .lang, .lux .menu-toggle { border-color: rgba(var(--white-rgb), .3); background: rgba(var(--white-rgb), .08); color: var(--on-dark); }
.site-footer { margin-top: 32px; border-top: 1px solid var(--border); padding-top: 64px; padding-bottom: 32px; background: var(--bg); color: var(--text); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.3fr; gap: 48px; }
.footer-grid > * { min-width: 0; }
.footer-brand p { max-width: 340px; margin-top: 20px; color: var(--text-muted); font-size: var(--fs-small); }
.footer-heading { font-size: var(--fs-small); margin: 0 0 16px; font-weight: var(--weight-medium); }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: var(--fs-small); }
.footer-links a { color: var(--text-muted); text-decoration: none; }
.footer-links a:hover { color: var(--accent-dark); text-decoration: underline; }
.footer-languages { display: flex; flex-wrap: wrap; gap: 8px 24px; padding-top: 32px; font-size: var(--fs-small); }
.footer-languages a { color: var(--text-muted); padding-block: 8px; text-decoration: none; }
.footer-languages a[aria-current] { color: var(--accent-dark); }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; border-top: 1px solid var(--border); margin-top: 24px; padding-top: 24px; font-size: var(--fs-caption); color: var(--text-muted); }
.footer-legal { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-legal a { color: var(--text-muted); }
.prose { max-width: 820px; min-width: 0; }
.prose h2 { margin-top: 64px; scroll-margin-top: 32px; }
.prose h3 { margin-top: 32px; }
.prose p, .prose li { line-height: 1.85; }
.prose p { margin-bottom: 20px; }
.prose li + li { margin-top: 8px; }
.prose ul, .prose ol { padding-left: 1.5em; }
.prose figure { margin-inline: 0; max-width: 100%; }
.decorated, .hero, .lux { position: relative; overflow-x: clip; isolation: isolate; }
.reveal { opacity: 1; transform: none; }
.reveal.is-watching { opacity: 0; transform: translateY(16px); transition: opacity var(--reveal-duration) ease, transform var(--reveal-duration) ease; }
.reveal.shown { opacity: 1; transform: none; }
@media (max-width: 1279px) {
  .desktop-nav { display: none; }
  .topbar__tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
}
@media (min-width: 1280px) { .mobile-drawer { display: none; } }
@media (max-width: 768px) {
  :root { --gutter: 24px; --fs-h1: clamp(24px, 4vw, 30px); --section-space: 64px; }
  .grid { grid-template-columns: 1fr; }
  .section__head { align-items: flex-start; flex-direction: column; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  .topbar { gap: 8px; }
  .brand { gap: 8px; font-size: 15px; }
  .topbar__tools { margin-left: auto; gap: 6px; }
  .lang { padding-inline: 10px; min-height: 44px; }
  .lang__full { display: none; }
  .lang__short { display: inline; }
  .panel, .stage { padding: 16px; }
  .tile { padding: 24px; }
  .tilt, [data-tilt] { transform: none !important; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .prose pre { padding: 16px; }
}
@media (max-width: 359px) {
  :root { --gutter: 16px; }
  .brand__text { font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal.is-watching { opacity: 1; transform: none; }
}