:root {
  color-scheme: light;
  --bg: #E9ECF8;
  --bg-top: #F2F4FC;
  --bg-bottom: #E1E6F5;
  --panel: #F7F8FE;
  --groove: #DCE1F3;
  --border: #C9D0E8;
  --accent: #52F06B;
  --accent-dark: #12873E;
  --accent-wash: #DDFBE3;
  --text: #0E1426;
  --muted: #525C7A;
  --success: #1A9E55;
  --warn: #C77A0A;
  --error: #D23A4A;
  --white: #FFFFFF;
  --transparent: transparent;
  --glass-white: rgb(255 255 255 / .62);
  --white-95: rgb(255 255 255 / .95);
  --white-90: rgb(255 255 255 / .9);
  --white-85: rgb(255 255 255 / .85);
  --white-75: rgb(255 255 255 / .75);
  --white-70: rgb(255 255 255 / .7);
  --white-65: rgb(255 255 255 / .65);
  --white-60: rgb(255 255 255 / .6);
  --flag-red: #D9262E;
  --flag-navy: #2B3772;
  --flag-white: #FFFFFF;
  --veil: rgb(14 20 38 / .24);
  --font-display: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --weight-regular: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --size-body: 16px;
  --size-small: 14px;
  --size-micro: 12px;
  --size-lede: 20px;
  --size-h1: 64px;
  --size-h2: clamp(28px, 3.1vw, 40px);
  --size-h3: 22px;
  --r-pill: 999px;
  --r-round: 50%;
  --r-lg: 24px;
  --r-md: 18px;
  --r-sm: 12px;
  --r-xs: 8px;
  --r-tick: 4px;
  --gutter: 24px;
  --content-width: 1248px;
  --reading-width: 848px;
  --head-end: 120px;
  --anchor-space: 144px;
  --toc-space: 196px;
  --hl-edge: inset 0 1px 0 var(--white-95), inset 0 0 0 1px var(--white-60);
  --shadow-tint: 0 28px 64px -14px color-mix(in srgb, var(--accent) 12%, transparent), 0 12px 28px -14px color-mix(in srgb, var(--text) 16%, transparent);
  --shadow-tint-deep: 0 36px 80px -16px color-mix(in srgb, var(--accent) 14%, transparent), 0 18px 36px -18px color-mix(in srgb, var(--text) 22%, transparent);
  --shadow-key: 0 44px 90px -28px color-mix(in srgb, var(--accent-dark) 30%, transparent);
  --shadow-nav: 0 18px 40px -20px color-mix(in srgb, var(--text) 18%, transparent);
  --ease: cubic-bezier(.2, .7, .3, 1);
  --time-fast: .2s;
  --time-reveal: .35s;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: var(--anchor-space); scroll-behavior: smooth; }
body { margin: 0; background: var(--bg-bottom); color: var(--text); font-family: var(--font-body); font-size: var(--size-body); line-height: 1.75; -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
svg { flex-shrink: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--accent-dark); text-underline-offset: 4px; }
a, button, summary, [tabindex], input, select, textarea { -webkit-tap-highlight-color: var(--accent-wash); }
:where(a, button, summary, [tabindex], input, select, textarea):focus-visible { outline: 2px solid var(--accent-dark); outline-offset: 4px; }
[hidden] { display: none !important; }
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: var(--weight-bold); color: var(--text); text-wrap: balance; overflow-wrap: break-word; }
h1 { margin: 0 0 24px; font-size: var(--size-h1); line-height: 1.1; letter-spacing: -.02em; }
h2 { margin: 0 0 24px; font-size: var(--size-h2); line-height: 1.25; letter-spacing: -.02em; }
h3 { margin: 0 0 12px; font-size: var(--size-h3); line-height: 1.4; }
p { margin: 0 0 20px; }
strong { font-weight: var(--weight-semibold); }
code { font-family: var(--font-mono); font-size: .88em; overflow-wrap: anywhere; }
pre { max-width: 100%; overflow-x: auto; padding: 24px; background: var(--groove); border-radius: var(--r-sm); }
pre code { overflow-wrap: normal; white-space: pre; }
blockquote { margin-inline: 0; }
hr { border: 0; border-top: 1px solid var(--border); margin-block: 32px; }
::selection { background: var(--accent-wash); color: var(--text); }
.wrap { width: 100%; max-width: var(--content-width); margin-inline: auto; padding-inline: var(--gutter); }
.reading-wrap { width: 100%; max-width: var(--reading-width); margin-inline: auto; padding-inline: var(--gutter); }
.sec { padding-top: 80px; padding-bottom: 80px; }
.section-head { max-width: 760px; margin-bottom: 32px; }
.section-head p, .muted { color: var(--muted); }
.hl { color: var(--accent-dark); }
.mono { font-family: var(--font-mono); }
.no-break { white-space: nowrap; }
.vh { position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.grain { position: fixed; inset: 0; width: 100%; height: 100%; pointer-events: none; opacity: .03; z-index: 60; }
.page { position: relative; background: linear-gradient(180deg, var(--bg-top) 0, var(--bg) 46%, var(--bg-bottom) 100%); overflow-x: clip; max-width: 100%; }
.decor-zone { position: relative; overflow-x: clip; max-width: 100%; }
.grid { display: grid; gap: 24px; }
.grid > *, .panel-body > *, .footer-grid > *, .feature-desk > * { min-width: 0; }
.grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card, .surface { padding: 32px; background: var(--panel); border-radius: var(--r-lg); box-shadow: var(--hl-edge), var(--shadow-tint); min-width: 0; }
.surface-recessed { background: var(--groove); border-radius: var(--r-lg); padding: 24px; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 48px; padding: 0 26px; border: 0; border-radius: var(--r-pill); font-family: var(--font-body); font-size: var(--size-body); font-weight: var(--weight-semibold); text-decoration: none; white-space: nowrap; flex-shrink: 0; transition: transform var(--time-fast) var(--ease), box-shadow var(--time-fast) var(--ease), background-color var(--time-fast) var(--ease); }
.btn svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.btn-primary { background: var(--accent); color: var(--text); box-shadow: inset 0 1px 0 var(--white-65), inset 0 0 0 1px color-mix(in srgb, var(--accent-dark) 22%, transparent), 0 14px 30px -12px color-mix(in srgb, var(--accent-dark) 55%, transparent); }
.btn-primary:hover { transform: translateY(-1px); }
.btn-primary:active { transform: translateY(1px); }
.btn-ghost, .btn-secondary { background: var(--transparent); color: var(--text); box-shadow: inset 0 0 0 1px var(--text); }
.btn-ghost:hover, .btn-secondary:hover { background: color-mix(in srgb, var(--panel) 60%, transparent); }
.btn-dark { background: var(--text); color: var(--panel); box-shadow: var(--hl-edge); }
.btn:disabled, .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; transform: none; }
.cta-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; }
.dot { display: inline-block; width: 7px; height: 7px; flex: none; border-radius: var(--r-round); }
.dot--ok { background: var(--success); box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 18%, transparent); }
.dot--deep { background: var(--accent-dark); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-dark) 18%, transparent); }
.dot--warm { background: var(--warn); box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn) 18%, transparent); }
.dot--error { background: var(--error); box-shadow: 0 0 0 3px color-mix(in srgb, var(--error) 18%, transparent); }
.ico-line { width: 16px; height: 16px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }

#site-header { position: relative; z-index: 40; }
.notice { position: relative; z-index: 6; min-height: 40px; display: flex; align-items: center; justify-content: center; gap: 14px; padding: 6px 20px; background: var(--accent-wash); color: var(--text); font-size: var(--size-small); line-height: 20px; box-shadow: inset 0 -1px 0 color-mix(in srgb, var(--accent-dark) 14%, transparent); }
.notice-sep { color: var(--accent-dark); }
.notice a { display: inline-flex; align-items: center; gap: 4px; min-height: 24px; color: var(--accent-dark); font-weight: var(--weight-semibold); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
.site-head { position: relative; z-index: 43; padding: 14px 40px 0; }
.nav { position: relative; max-width: 1200px; margin: 0 auto; height: 56px; display: flex; align-items: center; gap: 12px; padding: 0 8px 0 18px; border-radius: var(--r-pill); background: color-mix(in srgb, var(--panel) 80%, transparent); -webkit-backdrop-filter: blur(14px) saturate(1.2); backdrop-filter: blur(14px) saturate(1.2); box-shadow: var(--hl-edge), var(--shadow-nav); }
.brand { display: inline-flex; align-items: center; gap: 9px; flex: none; text-decoration: none; font-family: var(--font-display); font-weight: var(--weight-bold); font-size: 19px; letter-spacing: -.02em; color: var(--text); }
.brand img { width: 28px; height: 28px; flex: none; }
.brand-word { white-space: nowrap; }
.nav-links { display: flex; align-items: center; justify-content: center; list-style: none; margin: 0; padding: 0; gap: 2px; flex: 1; min-width: 0; }
.nav-links li { flex: none; }
.nav-links a { display: inline-flex; align-items: center; gap: 6px; height: 38px; padding: 0 11px; border-radius: var(--r-pill); font-size: var(--size-small); color: var(--muted); text-decoration: none; white-space: nowrap; transition: background-color var(--time-fast) var(--ease), color var(--time-fast) var(--ease); }
.nav-links svg { width: 16px; height: 16px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.nav-links a:hover { color: var(--text); background: color-mix(in srgb, var(--groove) 60%, transparent); }
.nav-links a[aria-current="page"] { color: var(--text); font-weight: var(--weight-semibold); background: var(--groove); box-shadow: inset 0 1px 0 color-mix(in srgb, var(--text) 5%, transparent); }
.nav-tools { display: flex; align-items: center; gap: 6px; flex-shrink: 0; margin-left: auto; }
.lang-picker { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 38px; width: auto; min-width: 44px; padding: 0 12px; border: 0; border-radius: var(--r-pill); font-size: var(--size-small); color: var(--muted); text-decoration: none; white-space: nowrap; background: var(--transparent); }
.lang span { white-space: nowrap; }
.lang:hover { color: var(--text); }
.lang-caret { font-size: 11px; }
.lang-panel { position: absolute; z-index: 49; top: calc(100% + 12px); right: 0; width: 196px; padding: 8px; border-radius: var(--r-md); background: var(--panel); box-shadow: var(--hl-edge), var(--shadow-tint-deep); }
.lang-panel a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; border-radius: var(--r-xs); color: var(--text); text-decoration: none; }
.lang-panel a:hover, .lang-panel a[aria-current] { background: var(--groove); }
.login { display: inline-flex; align-items: center; justify-content: center; gap: 7px; height: 40px; padding: 0 18px 0 16px; border-radius: var(--r-pill); background: var(--text); color: var(--panel); font-size: var(--size-small); font-weight: var(--weight-semibold); text-decoration: none; white-space: nowrap; box-shadow: inset 0 1px 0 color-mix(in srgb, var(--white) 18%, transparent); transition: transform var(--time-fast) var(--ease); flex-shrink: 0; }
.login:hover { transform: translateY(-1px); }
.menu-toggle { display: none; align-items: center; justify-content: center; flex-direction: column; gap: 4px; min-width: 44px; min-height: 44px; padding: 10px; border: 0; border-radius: var(--r-pill); color: var(--text); background: var(--groove); }
.menu-line { display: block; width: 20px; height: 2px; background: currentColor; border-radius: var(--r-tick); }
.menu-toggle[aria-expanded="true"] .menu-line:first-child { transform: translateY(6px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] .menu-line:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] .menu-line:last-child { transform: translateY(-6px) rotate(-45deg); }
.nav-drawer { position: fixed; z-index: 42; top: var(--head-end); right: 16px; left: 16px; height: calc(100dvh - var(--head-end) - 16px); max-height: calc(100dvh - var(--head-end) - 16px); overflow-y: auto; overscroll-behavior: contain; padding: 16px; background: var(--panel); border-radius: var(--r-lg); box-shadow: var(--shadow-tint-deep); }
.nav-drawer a { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 48px; padding: 12px 16px; border-radius: var(--r-xs); color: var(--text); text-decoration: none; }
.nav-drawer a:hover, .nav-drawer a[aria-current] { background: var(--groove); }
.drawer-languages { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
.nav-veil { position: fixed; z-index: 41; inset: var(--head-end) 0 0; border: 0; background: var(--veil); width: 100%; }
html.nav-open { overflow: hidden; }

.site-footer { margin-top: 48px; padding-top: 56px; padding-bottom: 28px; background: color-mix(in srgb, var(--groove) 52%, var(--bg)); box-shadow: inset 0 1px 0 var(--white-75); }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 48px; }
.footer-brand p { margin-top: 16px; max-width: 330px; color: var(--muted); font-size: var(--size-small); }
.footer-title { margin: 0 0 12px; font-size: var(--size-body); font-weight: var(--weight-semibold); }
.footer-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 16px; padding: 0; margin: 0; list-style: none; }
.footer-links a, .footer-languages a, .footer-legal a { display: inline-flex; align-items: center; min-height: 28px; color: var(--muted); text-decoration: none; font-size: var(--size-small); }
.footer-links a:hover, .footer-languages a:hover, .footer-legal a:hover { color: var(--accent-dark); text-decoration: underline; }
.footer-languages { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--border); }
.footer-bottom { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 20px; font-size: var(--size-micro); color: var(--muted); }
.footer-bottom p { margin: 0; }
.footer-legal { display: flex; gap: 20px; }

.prose { min-width: 0; overflow-wrap: break-word; }
.prose h2 { margin-top: 56px; }
.prose h3 { margin-top: 32px; }
.prose li { margin-bottom: 8px; }
.prose :where(p, li) { line-height: 1.9; }
.prose img { border-radius: var(--r-sm); }
section[id], h2[id], h3[id] { scroll-margin-top: var(--anchor-space); }
body:has(.toc-tabs) section[id], body:has(.toc-tabs) h2[id] { scroll-margin-top: var(--toc-space); }
#server-status { position: relative; display: block; min-height: 160px; overflow: hidden; min-width: 0; max-width: 100%; margin-top: 24px; margin-bottom: 32px; }
#server-status > * { min-width: 0; max-width: 100%; }
#server-status + * { margin-top: 32px; }
.reveal { transition: opacity var(--time-reveal) var(--ease), transform var(--time-reveal) var(--ease); }
.reveal.pending { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; }

@media (min-width: 1081px) {
  .nav-links a { padding-inline: 6px; }
  .nav-links svg { display: none; }
}
@media (max-width: 1180px) {
  .nav { gap: 12px; }
  .nav-links a { padding-inline: 8px; }
  .lang-text { display: none; }
}
@media (max-width: 1080px) {
  .nav { gap: 12px; }
  .nav-links { display: none; }
  .nav-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
}
@media (max-width: 768px) {
  :root { --gutter: 20px; --size-h1: 40px; --anchor-space: 132px; --toc-space: 184px; }
  .site-head { padding: 10px 16px 0; }
  .sec { padding-top: 48px; padding-bottom: 48px; }
  .grid-three { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .notice { font-size: 12.5px; gap: 8px; flex-wrap: wrap; }
  .card, .surface { padding: 24px; }
  .decor-zone { max-width: 100%; }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .no-break { white-space: normal; }
  .tilt, .decor-tilt { transform: none; }
  .brand-word { font-size: 17px; }
  .login { padding-inline: 14px; }
  .nav { padding-left: 12px; gap: 6px; }
  .nav-tools { gap: 4px; margin-left: auto; }
  .lang { padding-inline: 8px; }
  .lang-caret { display: none; }
  .login .ico-line { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .btn { padding-inline: 22px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .reveal, .reveal.pending { opacity: 1; transform: none; }
}