:root {
  --bg: #F7F7F8;
  --panel: #FFFFFF;
  --panel-2: #EEEEF2;
  --panel-3: #FAFAFC;
  --border: #E3E3EA;
  --border-strong: #CFCFD9;
  --line-soft: rgba(22,22,28,.06);
  --accent: #FF3B5C;
  --accent-dark: #D61F45;
  --coral: #FF7A59;
  --accent-soft: #FFE6EB;
  --accent-tint: rgba(255,59,92,.06);
  --text: #16161C;
  --ink-2: #3A3B47;
  --muted: #5D5E6B;
  --muted-2: #7A7B88;
  --faint: #8A8B98;
  --success: #00B36B;
  --success-2: #2FD08C;
  --success-ink: #007A49;
  --success-soft: #E1F6EC;
  --warn: #E89A00;
  --warn-2: #FFC24D;
  --warn-ink: #8F5F00;
  --warn-soft: #FFF3D6;
  --error: #C9302C;
  --blue: #3D8BFF;
  --blue-2: #7DB2FF;
  --white: #FFFFFF;
  --wash-red: rgba(255,59,92,.055);
  --glow-coral: rgba(255,122,89,.15);
  --shadow-tint: rgba(214,31,69,.10);
  --shadow-accent: rgba(255,59,92,.30);
  --shadow-ink: rgba(22,22,28,.07);
  --hi-soft: rgba(255,255,255,.38);
  --hi-line: rgba(255,255,255,.7);
  --sheen: rgba(255,255,255,.16);
  --veil: rgba(22,22,28,.30);
  --clear: transparent;
  --flag-white: #FFFFFF;
  --flag-us-red: #B22234;
  --flag-us-blue: #3C3B6E;
  --flag-jp: #BC002D;
  --flag-sg: #EF3340;
  --flag-hk: #DE2910;
  --flag-ca: #D80621;
  --flag-edge: rgba(22,22,28,.16);
  --font-display: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",sans-serif;
  --font-body: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono: "JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --r-pill: 999px;
  --r-win: 28px;
  --r-base: 48px;
  --r-card: 20px;
  --r-block: 8px;
  --r-tool: 10px;
  --r-small: 3px;
  --r-round: 50%;
  --gutter: 24px;
  --wrap: 1328px;
  --header-height: 72px;
  --anchor-space: 96px;
  --toc-space: 156px;
  --display-size: 64px;
  --section-size: 44px;
  --shadow-panel: 0 18px 48px -24px var(--shadow-tint);
  --gradient-cta: linear-gradient(115deg,var(--accent),var(--coral));
  --ease: .2s ease;
}
*,*::before,*::after { box-sizing:border-box }
html { -webkit-text-size-adjust:100%; scroll-behavior:smooth; scroll-padding-top:var(--anchor-space) }
body { margin:0; background:var(--bg); color:var(--text); font:16px/1.6 var(--font-body); -webkit-font-smoothing:antialiased }
a { color:inherit; text-decoration:none }
button,input,select,textarea { font:inherit; color:inherit }
button { cursor:pointer }
button:disabled { cursor:not-allowed }
img { max-width:100%; height:auto; display:block }
svg { flex-shrink:0 }
p,h1,h2,h3,h4 { margin:0 }
h1,h2,h3,h4 { font-family:var(--font-display); font-weight:700; overflow-wrap:break-word }
h1 { font-size:clamp(52px,4.45vw,68px); line-height:1.12; letter-spacing:-.02em; text-wrap:balance }
h2 { font-size:clamp(28px,3vw,44px); line-height:1.2; letter-spacing:-.02em; text-wrap:balance }
h3 { font-size:23px; line-height:1.35 }
ul { list-style:none; margin:0; padding:0 }
button { border:0 }
[hidden] { display:none!important }
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible {
  outline:3px solid var(--accent-dark); outline-offset:3px; border-radius:var(--r-block);
}
::selection { background:var(--accent-soft); color:var(--accent-dark) }
.wrap { width:100%; max-width:var(--wrap); margin-inline:auto; padding-inline:var(--gutter) }
.section { padding-top:80px; padding-bottom:80px }
.stack { display:grid; gap:24px; min-width:0 }
.grid { display:grid; gap:24px; grid-template-columns:repeat(3,minmax(0,1fr)) }
.grid > *, .stack > *, .wrap > *, .split > * { min-width:0 }
.split { display:grid; grid-template-columns:minmax(0,2fr) minmax(0,3fr); gap:48px; align-items:center }
.panel,.card { background:var(--panel); border:1px solid var(--border); border-radius:var(--r-win); box-shadow:inset 0 1px 0 var(--hi-line),var(--shadow-panel); min-width:0; padding:28px }
.panel-subtle { background:var(--panel-2) }
.muted { color:var(--muted) }
.mono { font-family:var(--font-mono); font-variant-numeric:tabular-nums }
.no-break { white-space:nowrap }
.vh { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0 }
.sprite { position:absolute; width:0; height:0; overflow:hidden }
.sec-title { font-family:var(--font-display); font-size:var(--section-size); font-weight:700; line-height:1.2; letter-spacing:-.02em; text-align:center }
.section-intro { max-width:740px; margin:18px auto 32px; color:var(--muted); text-align:center }
.prose { min-width:0; max-width:850px; margin-inline:auto; line-height:1.85; overflow-wrap:break-word }
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote { margin-block:20px }
.prose h2 { margin-top:56px; margin-bottom:24px; font-size:34px }
.prose h3 { margin-top:32px; margin-bottom:16px }
.prose ul { list-style:disc; padding-left:24px }
.prose ol { padding-left:24px }
.prose li + li { margin-top:8px }
.prose a:not(.btn) { color:var(--accent-dark); text-decoration:underline; text-underline-offset:4px }
code { font-family:var(--font-mono); font-size:.9em; overflow-wrap:anywhere; word-break:break-word }
:not(pre) > code { background:var(--panel-2); border-radius:var(--r-block); padding:2px 5px }
pre { max-width:100%; overflow-x:auto; padding:20px; background:var(--panel-2); border:1px solid var(--border); border-radius:var(--r-card) }
pre code { white-space:pre; overflow-wrap:normal; word-break:normal }
section[id],h2[id],h3[id] { scroll-margin-top:var(--anchor-space) }
body:has(.toc-tabs) section[id] { scroll-margin-top:var(--toc-space) }
.decor-zone,.top { position:relative; overflow-x:clip; max-width:100% }
.top {
  background:radial-gradient(ellipse 44% 48% at 88% 4%,var(--glow-coral) 0%,var(--clear) 72%),linear-gradient(180deg,var(--wash-red) 0%,var(--bg) 78%);
}
.decor-glow { position:absolute; inset:0 0 45% 45%; pointer-events:none; background:radial-gradient(ellipse,var(--glow-coral),var(--clear) 72%); max-width:100% }
.btn { display:inline-flex; align-items:center; justify-content:center; gap:10px; min-height:54px; padding:12px 28px; border:1px solid var(--clear); border-radius:var(--r-pill); font-size:17px; line-height:1.5; font-weight:600; white-space:nowrap; flex-shrink:0; transition:transform var(--ease),box-shadow var(--ease),background var(--ease); text-align:center; max-width:100% }
.btn-main,.btn-primary { color:var(--white); background:var(--gradient-cta); box-shadow:inset 0 1px 0 var(--hi-soft),0 16px 30px -14px var(--shadow-accent) }
.btn-main:hover,.btn-primary:hover { transform:translateY(-1px); box-shadow:inset 0 1px 0 var(--hi-soft),0 18px 34px -12px var(--shadow-accent) }
.btn-main:active,.btn-primary:active { transform:translateY(0) }
.btn-ghost,.btn-secondary { color:var(--text); background:var(--panel); border-color:var(--border-strong) }
.btn-ghost:hover,.btn-secondary:hover { border-color:var(--text) }
.btn-small { min-height:44px; font-size:14px; padding:9px 20px }
.btn:disabled,.btn[aria-disabled="true"] { opacity:.55; box-shadow:none; transform:none; pointer-events:none }
.ctas { margin-top:24px; display:flex; flex-wrap:wrap; gap:12px }
.head { border-bottom:1px solid var(--line-soft); position:relative; z-index:50 }
.head-in { max-width:1440px; margin:0 auto; padding:0 56px; height:var(--header-height); display:flex; align-items:center; gap:36px }
.brand { display:inline-flex; align-items:center; gap:10px; flex:none; min-height:44px }
.brand-logo { width:34px; height:34px; border-radius:var(--r-tool); flex:none }
.brand-en { font-family:var(--font-display); font-weight:800; font-size:20px; letter-spacing:-.02em }
.tabs { flex:1; min-width:0 }
.tabs ul { display:flex; align-items:center; list-style:none; margin:0; padding:0; height:var(--header-height); gap:0 }
.tabs a { position:relative; display:flex; align-items:center; justify-content:center; height:var(--header-height); padding:0 13px; font-size:15px; font-weight:500; color:var(--muted); white-space:nowrap; transition:color var(--ease) }
.tabs a:hover { color:var(--text) }
.tabs a::after { content:""; position:absolute; left:13px; right:13px; bottom:-1px; height:3px; border-radius:var(--r-small) var(--r-small) 0 0; background:var(--text); transform:scaleX(0); transition:transform .25s }
.tabs a.is-on { color:var(--text); font-weight:600 }
.tabs a.is-on::after { transform:scaleX(1) }
.head-tools { margin-left:auto; display:flex; align-items:center; gap:10px; flex-shrink:0 }
.lang-box { position:relative }
.lang { display:inline-flex; align-items:center; justify-content:center; gap:6px; min-height:40px; width:auto; padding:0 12px; border:0; border-radius:var(--r-pill); background:var(--clear); font-size:14px; color:var(--muted); cursor:pointer; white-space:nowrap }
.lang span { white-space:nowrap }
.lang:hover { background:var(--panel-2); color:var(--text) }
.lang-panel { position:absolute; right:0; top:calc(100% + 10px); z-index:80; min-width:176px; padding:8px; background:var(--panel); border:1px solid var(--border); border-radius:var(--r-card); box-shadow:var(--shadow-panel) }
.lang-panel a { display:flex; align-items:center; width:100%; min-height:44px; padding:9px 14px; border-radius:var(--r-tool); white-space:nowrap }
.lang-panel a:hover,.lang-panel a[aria-current="true"] { background:var(--accent-soft); color:var(--accent-dark) }
.login { display:inline-flex; align-items:center; justify-content:center; min-height:40px; padding:8px 22px; border-radius:var(--r-pill); border:1.5px solid var(--text); background:var(--panel); font-size:14px; line-height:1.5; font-weight:600; white-space:nowrap; transition:background var(--ease),color var(--ease) }
.login:hover { background:var(--text); color:var(--white) }
.menu-toggle { display:none; min-width:44px; min-height:44px; padding:10px; border-radius:var(--r-tool); background:var(--clear); color:var(--text); align-items:center; justify-content:center; flex-direction:column; gap:5px }
.menu-line { display:block; width:20px; height:2px; background:currentColor; border-radius:var(--r-small) }
.menu-toggle[aria-expanded="true"] .menu-line:first-child { transform:translateY(7px) 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(-7px) rotate(-45deg) }
.drawer { position:fixed; z-index:60; top:var(--header-height); right:0; width:min(420px,100%); height:calc(100dvh - var(--header-height)); max-height:calc(100dvh - var(--header-height)); overflow-y:auto; overscroll-behavior:contain; padding:16px 24px 32px; background:var(--panel); border-left:1px solid var(--border) }
.drawer a { display:flex; align-items:center; width:100%; min-height:46px; padding:11px 14px; color:var(--ink-2); border-radius:var(--r-tool) }
.drawer a:hover,.drawer a.is-on { color:var(--accent-dark); background:var(--accent-soft) }
.drawer-label { display:block; padding:20px 14px 8px; color:var(--muted); font-size:13px; border-top:1px solid var(--border); margin-top:12px }
.menu-veil { position:fixed; z-index:55; inset:var(--header-height) 0 0; background:var(--veil); border:0; width:100%; height:calc(100dvh - var(--header-height)); cursor:pointer }
html.nav-open { overflow:hidden }
.site-footer { margin-top:48px; padding-top:56px; padding-bottom:24px; background:var(--panel); border-top:1px solid var(--border); box-shadow:0 -24px 64px -48px var(--shadow-tint) }
.footer-grid { display:grid; grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) minmax(0,1fr) minmax(0,.8fr); gap:40px }
.footer-brand p { margin-top:18px; color:var(--muted); max-width:350px }
.footer-heading { font-size:15px; font-weight:700; margin-bottom:14px }
.footer-links { display:grid; gap:6px }
.footer-links a { display:inline-flex; align-items:center; min-height:28px; font-size:14px; color:var(--muted); overflow-wrap:anywhere }
.footer-links a:hover { color:var(--accent-dark) }
.footer-bottom { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:16px; border-top:1px solid var(--border); margin-top:40px; padding-top:24px; color:var(--muted); font-size:13px }
.footer-legal { display:flex; flex-wrap:wrap; gap:20px }
.footer-legal a { display:inline-flex; align-items:center; min-height:28px }
.reveal { transition:opacity .35s ease,transform .35s ease }
.reveal.pending { opacity:0; transform:translateY(16px) }
.reveal.shown { opacity:1; transform:none }
#server-status { position:relative; display:grid; grid-template-columns:minmax(0,1fr); min-width:0; max-width:100%; overflow:hidden; margin-top:24px; margin-bottom:24px }
#server-status > * { min-width:0; max-width:100% }
#server-status + * { margin-top:24px }
@media (max-width:1380px) {
  .head-in { gap:24px; padding-inline:32px }
  .tabs a { padding-inline:9px; font-size:14px }
  .tabs a::after { left:9px; right:9px }
}
@media (max-width:1180px) {
  .head-in { gap:16px }
  .tabs ul { overflow-x:auto; gap:4px; scrollbar-width:thin }
  .tabs a { padding-inline:8px }
  .lang { padding-inline:8px }
  .login { padding-inline:16px }
}
@media (max-width:1080px) {
  .head-in { padding-inline:24px; flex-wrap:nowrap }
  .head-tools { margin-left:auto }
  .head-in > .tabs { display:none }
  .menu-toggle { display:inline-flex }
  .footer-grid { grid-template-columns:repeat(2,minmax(0,1fr)) }
  .grid { grid-template-columns:repeat(2,minmax(0,1fr)) }
  .split { gap:32px }
}
@media (max-width:768px) {
  :root { --display-size:40px; --section-size:30px }
  h1 { font-size:clamp(28px,7vw,40px); line-height:1.15 }
  .section { padding-top:48px; padding-bottom:48px }
  .split { grid-template-columns:minmax(0,1fr); gap:28px }
  .btn { min-height:50px; padding:11px 22px; font-size:16px }
  .btn-small { min-height:44px; font-size:14px; padding:9px 18px }
  .prose h2 { font-size:28px }
}
@media (max-width:640px) {
  :root { --gutter:16px }
  .no-break { white-space:normal }
  .tilt,[data-tilt] { transform:none!important }
  .decor-zone,.top { max-width:100%; overflow-x:clip }
  .decor-glow { max-width:100% }
  .head-in { padding-inline:16px; gap:8px }
  .head-tools { margin-left:auto; gap:3px }
  .brand { gap:7px }
  .brand-en { font-size:18px }
  .brand-logo { width:30px; height:30px }
  .lang { font-size:12px; padding-inline:6px; gap:4px }
  .login { padding:8px 12px; font-size:13px }
  .grid { grid-template-columns:minmax(0,1fr) }
  .panel,.card { padding:22px }
  .footer-grid { gap:32px 24px }
  .footer-brand { grid-column:1 / -1 }
  .site-footer { padding-top:40px }
}
@media (max-width:359px) {
  .head-in { gap:5px }
  .brand-en { font-size:16px }
  .brand-logo { width:26px; height:26px }
  .brand { gap:5px }
  .lang { padding-inline:3px }
  .login { padding-inline:9px }
  .head-tools { gap:1px }
}
@media (prefers-reduced-motion:reduce) {
  html { scroll-behavior:auto }
  *,*::before,*::after { animation:none!important; transition:none!important }
  .reveal,.reveal.pending,.reveal.shown { opacity:1; transform:none }
}