:root {
  --bg:#FBFCFB;
  --panel:#FFFFFF;
  --panel-2:#F2F4F1;
  --border:#E1E6E3;
  --accent:#19C9AE;
  --accent-hover:#14B79E;
  --accent-dark:#0B6E5E;
  --accent-tint:#DCF5F0;
  --text:#141A18;
  --muted:#56625D;
  --success:#1E9E5A;
  --warn:#C98A12;
  --error:#CF4339;
  --pine:#0D3A2E;
  --pine-lift:#14503F;
  --pine-lift-none:rgba(20,80,63,0);
  --charcoal:#17191A;
  --lime:#D9EF8F;
  --lime-tint:#EEF6D2;
  --lime-ink:#566B16;
  --prism-top-a:#3FA58C;
  --prism-top-b:#1E6B57;
  --prism-left-hi:#1A604D;
  --prism-left:#155443;
  --prism-right-hi:#124B3C;
  --prism-right:#0F4436;
  --prism-shadow:rgba(2,18,13,.62);
  --prism-shadow-none:rgba(2,18,13,0);
  --glint:rgba(255,255,255,.55);
  --glint-none:rgba(255,255,255,0);
  --inlay:rgba(9,46,36,.30);
  --inlay-line:rgba(255,255,255,.16);
  --edge-crisp:rgba(255,255,255,.30);
  --edge-faint:rgba(255,255,255,.10);
  --spoke:rgba(255,255,255,.38);
  --node:#E4F7F2;
  --node-halo:rgba(255,255,255,.14);
  --on-dark:#FFFFFF;
  --on-dark-muted:rgba(255,255,255,.70);
  --hairline-dark:rgba(255,255,255,.08);
  --edge-hi:rgba(255,255,255,.10);
  --edge-soft:rgba(255,255,255,.05);
  --glass:rgba(255,255,255,.10);
  --glass-line:rgba(255,255,255,.20);
  --wash-top:rgba(25,201,174,.06);
  --wash-none:rgba(251,252,251,0);
  --blob:rgba(20,80,63,.10);
  --blob-none:rgba(20,80,63,0);
  --shadow-teal:rgba(25,201,174,.12);
  --shadow-teal-strong:rgba(25,201,174,.14);
  --shadow-cta:rgba(25,201,174,.45);
  --shadow-pine:rgba(13,58,46,.16);
  --shadow-pine-strong:rgba(13,58,46,.32);
  --shadow-deep:rgba(3,22,16,.48);
  --success-halo:rgba(30,158,90,.16);
  --success-halo-dark:rgba(30,158,90,.30);
  --tier-chip:rgba(255,255,255,.08);
  --tier-line:rgba(255,255,255,.14);
  --veil:rgba(3,22,16,.48);
  --flag-red:#D52B2F;
  --flag-white:#FFFFFF;
  --flag-blue:#253A75;
  --flag-navy:#1B2A63;
  --flag-ring:rgba(20,26,24,.10);
  --clear:transparent;
  --radius-xl:36px;
  --radius-win:18px;
  --radius-tag:14px;
  --radius-tile:12px;
  --radius-btn:8px;
  --radius-small:6px;
  --radius-chip:10px;
  --radius-pill:999px;
  --radius-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,"Segoe UI",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --container:1200px;
  --reading:800px;
  --gutter:24px;
  --header-height:128px;
  --anchor-offset:148px;
  --toc-offset:204px;
  --ease:200ms ease;
  --reveal-time:350ms;
}
* {box-sizing:border-box;margin:0;padding:0}
html {-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body {background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html.nav-open {overflow:hidden}
[hidden] {display:none!important}
a {color:inherit;text-decoration:none}
button,input,select,textarea {font:inherit;color:inherit}
button {cursor:pointer}
button,a,summary {-webkit-tap-highlight-color:var(--accent-tint)}
button {border:0}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible {outline:2px solid var(--accent-dark);outline-offset:3px}
ul {list-style:none}
img {display:block;max-width:100%;height:auto}
svg {display:block;flex-shrink:0}
h1,h2,h3 {font-family:var(--font-display);font-weight:800;text-wrap:balance;overflow-wrap:break-word}
h1 {font-size:clamp(52px,4.6vw,66px);line-height:1.1;letter-spacing:-.02em}
h2 {font-size:40px;line-height:1.2;letter-spacing:-.02em}
h3 {font-size:24px;line-height:1.3;letter-spacing:-.01em}
.no-break {white-space:nowrap}
.shell,.wrap {width:100%;max-width:calc(var(--container) + 48px);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap {width:100%;max-width:calc(var(--reading) + 48px);margin-inline:auto;padding-inline:var(--gutter)}
.section {padding-top:72px;padding-bottom:72px}
.section-head {margin-bottom:32px}
.section-head p {margin-top:16px;color:var(--muted);max-width:680px}
.center {text-align:center}
.muted {color:var(--muted)}
.mono {font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.grid-two,.grid-three {display:grid;gap:24px}
.grid-two {grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three {grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two>*,.grid-three>*,.shell>*,.wrap>* {min-width:0}
.stack>*+* {margin-top:24px}
.panel,.card {padding:28px;border:1px solid var(--border);border-radius:var(--radius-win);background:var(--panel);box-shadow:0 20px 48px -30px var(--shadow-teal-strong)}
.prose {overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote {margin-block:20px}
.prose h2 {margin-top:48px;margin-bottom:20px;font-size:32px}
.prose h3 {margin-top:32px;margin-bottom:16px}
.prose ul {list-style:disc;padding-left:24px}
.prose ol {padding-left:24px}
.prose a {color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
code {font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--radius-small);padding:2px 5px}
pre {max-width:100%;overflow-x:auto;padding:20px;background:var(--charcoal);color:var(--on-dark);border-radius:var(--radius-tile)}
pre code {background:var(--clear);padding:0;overflow-wrap:normal;white-space:pre}
.btn,.btn-s,.btn-login {display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;font-weight:700;border-radius:var(--radius-btn);transition:background-color var(--ease),transform var(--ease),box-shadow var(--ease)}
.btn {gap:10px;min-height:54px;padding:12px 28px;font-size:17px;letter-spacing:.01em}
.btn svg {width:18px;height:18px}
.btn--primary,.btn-primary,.btn-s--teal {background:var(--accent);color:var(--text);box-shadow:0 14px 28px -14px var(--shadow-cta)}
.btn--primary:hover,.btn-primary:hover,.btn-s--teal:hover,.btn.is-hover {background:var(--accent-hover);transform:translateY(-1px)}
.btn:active {transform:translateY(1px)}
.btn--ghost {background:var(--panel);color:var(--text);box-shadow:inset 0 0 0 1px var(--text)}
.btn--ghost:hover,.btn--white:hover,.btn-s--white:hover {background:var(--panel-2)}
.btn--white,.btn-s--white {background:var(--panel);color:var(--text)}
.btn--dark,.btn-login {background:var(--text);color:var(--panel)}
.btn--dark:hover,.btn-login:hover {background:var(--charcoal)}
.btn:disabled,.btn[aria-disabled="true"] {background:var(--panel-2);color:var(--muted);box-shadow:none;cursor:not-allowed}
.btn.is-focus {outline:2px solid var(--accent-dark);outline-offset:3px}
.btn-s {gap:8px;height:34px;min-width:24px;padding:0 16px;font-size:14px}
.btn-login {min-height:40px;padding:8px 22px;font-size:15px}
.cta-row {display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.notice {background:var(--pine);color:var(--lime)}
.notice-in {display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px 24px;min-height:52px;padding:8px 24px}
.notice-text {font-size:15px;font-weight:600;letter-spacing:.01em}
.notice-sep {color:var(--on-dark-muted);padding:0 6px}
.notice-actions {display:flex;gap:10px}
.notice-link {display:inline-flex;align-items:center;min-height:24px;font-size:13px;color:var(--on-dark-muted);text-decoration:underline;text-underline-offset:3px}
.notice-link:hover {color:var(--on-dark)}
#site-header {position:relative;z-index:80}
.nav {position:relative;z-index:82}
.nav-in {display:flex;align-items:center;flex-wrap:nowrap;min-height:76px;column-gap:30px}
.brand {display:inline-flex;align-items:center;flex-shrink:0;gap:10px;font-family:var(--font-display);font-weight:800;font-size:21px;letter-spacing:-.02em;color:var(--text);min-height:40px}
.brand img {width:34px;height:34px}
.desktop-nav {flex:1;min-width:0}
.menu {display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:24px;font-size:15px}
.menu li {min-width:0}
.menu a {display:flex;align-items:center;min-height:40px;padding-block:8px;color:var(--muted);font-weight:500;white-space:nowrap}
.menu a:hover {color:var(--text)}
.menu a[aria-current="page"] {color:var(--text);font-weight:700}
.nav-end {margin-left:auto;display:flex;align-items:center;gap:12px;flex-shrink:0}
.language {position:relative}
.lang {display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;width:auto;min-width:44px;padding:8px 12px;background:var(--clear);border-radius:var(--radius-btn);font-size:14px;font-weight:500;color:var(--text);white-space:nowrap}
.lang span {white-space:nowrap}
.lang:hover {background:var(--panel-2)}
.lang svg {width:16px;height:16px;color:var(--muted)}
.lang-panel {position:absolute;right:0;top:calc(100% + 8px);z-index:100;min-width:184px;padding:8px;border:1px solid var(--border);border-radius:var(--radius-tile);background:var(--panel);box-shadow:0 20px 44px -20px var(--shadow-pine-strong)}
.lang-panel a {display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;border-radius:var(--radius-btn)}
.lang-panel a:hover,.lang-panel a[aria-current="true"] {background:var(--accent-tint);color:var(--accent-dark)}
.menu-toggle {display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;background:var(--clear);color:var(--text);border:1px solid var(--border);border-radius:var(--radius-btn)}
.menu-line {display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer {display:none}
.nav-veil {display:none}
.footer {background:var(--panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:32px}
.footer-grid {display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.footer-grid>* {min-width:0}
.footer-brand p {max-width:340px;margin-top:16px;color:var(--muted)}
.footer-title {font-size:15px;font-weight:700;margin-bottom:16px}
.footer-links {display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px}
.footer-links a,.footer-languages a,.footer-legal a {display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted)}
.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 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom {display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:13px;color:var(--muted)}
.footer-legal {display:flex;flex-wrap:wrap;gap:16px}
.reveal {transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending {opacity:0;transform:translateY(16px)}
.reveal.shown {opacity:1;transform:none}
#server-status {position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status>* {min-width:0;max-width:100%}
#server-status+* {margin-top:32px}
.decor-zone {position:relative;overflow-x:clip}
.motion-decor {pointer-events:none}
.defs {position:absolute;width:0;height:0;overflow:hidden}
@media (max-width:1279px) {
  .menu {gap:17px;font-size:14px}
  .nav-in {column-gap:24px}
}
@media (max-width:1100px) {
  :root {--header-height:128px}
  .desktop-nav {display:none}
  .nav-end {margin-left:auto}
  .menu-toggle {display:inline-flex}
  .mobile-drawer:not([hidden]) {display:block;position:fixed;left:0;right:0;top:var(--header-height);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;overflow-y:auto;overscroll-behavior:contain;background:var(--panel);border-top:1px solid var(--border);z-index:81}
  .mobile-drawer a {display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--radius-btn)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current] {background:var(--accent-tint);color:var(--accent-dark)}
  .drawer-languages {margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
  .nav-veil:not([hidden]) {display:block;position:fixed;inset:var(--header-height) 0 0;background:var(--veil);z-index:79}
  html.nav-open #site-header {position:sticky;top:0}
}
@media (max-width:768px) {
  :root {--header-height:164px;--anchor-offset:100px;--toc-offset:88px;--gutter:20px}
  h1 {font-size:38px}
  h2 {font-size:28px}
  .section {padding-top:48px;padding-bottom:48px}
  .notice-in {height:96px;gap:8px 16px}
  .notice-text {width:100%;text-align:center;font-size:13.5px}
  .notice-link {display:none}
  .nav-in {min-height:68px;column-gap:12px}
  .brand {font-size:19px;gap:8px}
  .nav-end {gap:8px;margin-left:auto}
  .lang {padding:8px;font-size:12px}
  .btn-login {padding:8px 14px;font-size:14px}
  .btn {min-height:50px;padding:12px 22px;font-size:16px}
  .cta-row {margin-top:24px}
  .grid-three {grid-template-columns:1fr}
  .footer-grid {grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand {grid-column:1/-1}
  .prose h2 {font-size:26px}
}
@media (max-width:640px) {
  :root {--gutter:16px}
  .no-break {white-space:normal}
  .grid-two,.footer-grid {grid-template-columns:1fr}
  .tilt,[data-tilt] {transform:none}
  .decor-zone,.motion-decor {max-width:100%}
  .panel,.card {padding:22px}
}
@media (max-width:380px) {
  .brand {font-size:16px;gap:6px}
  .brand img {width:28px;height:28px}
  .nav-end {gap:4px}
  .btn-login {padding:8px 10px}
  .lang {padding:8px 4px;font-size:11px}
  .lang svg {display:none}
  .notice-text {font-size:12px}
}
@media (prefers-reduced-motion:reduce) {
  html {scroll-behavior:auto}
  *,*::before,*::after {transition:none!important;animation:none!important}
  .reveal,.reveal.pending {opacity:1;transform:none}
}