:root{
  --bg:#F7EFE5;--paper-top:#FBF6EE;--paper-bottom:#F1E7D8;--panel:#FFFCF7;--groove:#EFE5D6;--border:#DCCFBC;
  --accent:#2747D3;--accent-dark:#182F99;--text:#2A2118;--text-muted:#6E6152;--success:#2F7D4F;--warn:#B9770E;--error:#B3352B;--on-accent:#FFFCF7;
  --clear:transparent;--veil:rgba(255,252,247,.55);--accent-ring:rgba(39,71,211,.16);--accent-glow:rgba(96,124,255,.75);--atmos:rgba(39,71,211,.06);--atmos-clear:rgba(39,71,211,0);
  --shadow-ultra-08:rgba(39,71,211,.08);--shadow-ultra-12:rgba(39,71,211,.12);--shadow-ultra-14:rgba(39,71,211,.14);--shadow-ultra-24:rgba(39,71,211,.24);--shadow-ultra-40:rgba(39,71,211,.40);--shadow-navy:rgba(27,42,138,.22);
  --device-deep:#1B2A8A;--device-lift:#3A55D9;--device-ink:#0F1754;--device-vignette:rgba(8,12,64,.32);--device-vignette-clear:rgba(8,12,64,0);--window-edge:rgba(255,255,255,.42);
  --glow-violet:#8A4BE8;--glow-rose:#E2639F;--glow-violet-soft:rgba(138,75,232,.9);--glow-violet-clear:rgba(138,75,232,0);--glow-rose-soft:rgba(226,99,159,.85);--glow-rose-clear:rgba(226,99,159,0);--glow-core:rgba(242,150,196,.7);
  --glass-1:rgba(255,255,255,.28);--glass-2:rgba(255,255,255,.09);--glass-3:rgba(160,176,255,.12);--glass-core-1:rgba(255,255,255,.40);--glass-core-2:rgba(255,255,255,.14);--glass-hi:rgba(255,255,255,.62);--glass-rim:rgba(255,255,255,.20);--glass-under:rgba(8,12,64,.38);--glass-drop:rgba(6,10,52,.45);--glass-sheen:rgba(255,255,255,.20);--glass-sheen-clear:rgba(255,255,255,0);--glass-ink:#F7F4FF;--glass-ink-dim:rgba(247,244,255,.72);
  --flag-red:#C8102E;--flag-white:#FFFFFF;--flag-navy:#012169;--flag-blue:#3C3B6E;--menu-shade:rgba(42,33,24,.28);
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Noto Sans SC','Inter','PingFang SC','Hiragino Sans GB','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --radius-0:0;--radius-2:2px;--radius-dot:50%;--gutter:40px;--wrap-width:1440px;--header-height:72px;--anchor-offset:88px;--toc-offset:160px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:40px;--space-6:48px;--space-8:64px;--space-10:80px;
  --size-body:16px;--size-small:14px;--size-h1:64px;--size-h2:36px;--size-h3:24px;--weight-regular:400;--weight-medium:500;--weight-brand:600;
  --tracking-display:-.02em;--line-body:1.6;--line-display:1.125;--speed:.2s;--reveal-speed:.35s;--grain-opacity:.03;
  --panel-shadow:0 24px 48px -28px var(--shadow-ultra-12);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:var(--line-body);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:3px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:var(--accent-ring)}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.5}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
[hidden]{display:none!important}
img{max-width:100%;height:auto;display:block}
svg{flex-shrink:0}
h1,h2,h3,h4,p{margin:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-regular);overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:var(--line-display);letter-spacing:var(--tracking-display)}
h2{font-size:var(--size-h2);line-height:1.25;letter-spacing:var(--tracking-display)}
h3{font-size:var(--size-h3);line-height:1.4}
ul,ol{margin:0;padding:0}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--groove);border:1px solid var(--border);border-radius:var(--radius-0)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
input,select,textarea{max-width:100%;padding:12px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-0)}
::selection{background:var(--accent-ring);color:var(--text)}
.wrap{max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:var(--space-8);padding-bottom:var(--space-8)}
.section-head{margin-bottom:var(--space-4)}
.section-head p{margin-top:var(--space-2);max-width:72ch;color:var(--text-muted)}
.stack>*+*{margin-top:var(--space-3)}
.grid-2,.grid-3,.grid-4{display:grid;gap:var(--space-3)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
:where(.grid-2,.grid-3,.grid-4,.hero-grid)>*{min-width:0}
.panel,.card{padding:var(--space-3);background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-0);box-shadow:var(--panel-shadow);min-width:0}
.panel-inset{padding:var(--space-3);background:var(--groove);border:1px solid var(--border);border-radius:var(--radius-0);min-width:0}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.skip{position:absolute;left:16px;top:-56px;z-index:100;padding:8px 16px;background:var(--accent);color:var(--on-accent);font-size:var(--size-small);border-radius:var(--radius-0)}
.skip:focus{top:12px}
.prose{max-width:80ch;min-width:0}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:var(--space-3)}
.prose h2{margin-top:var(--space-8);margin-bottom:var(--space-3)}
.prose h3{margin-top:var(--space-4);margin-bottom:var(--space-2)}
.prose ul,.prose ol{padding-left:var(--space-3)}
.prose li+li{margin-top:var(--space-1)}
.prose a{text-decoration:underline;text-underline-offset:3px}
.actions{margin-top:32px;display:flex;flex-wrap:wrap;gap:16px}
.btn{display:inline-flex;align-items:center;justify-content:space-between;gap:24px;min-height:56px;padding:16px 20px 16px 24px;font-size:var(--size-body);line-height:1.4;border:1px solid var(--clear);border-radius:var(--radius-0);transition:background-color var(--speed),border-color var(--speed),color var(--speed);flex-shrink:0;white-space:nowrap}
.btn:hover{text-decoration:none}
.btn svg{width:20px;height:20px;transition:transform var(--speed)}
.btn:hover svg{transform:translateX(3px)}
.btn-primary{min-width:232px;background:var(--accent);border-color:var(--accent);color:var(--on-accent);box-shadow:0 14px 28px -14px var(--shadow-ultra-40)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark);border-color:var(--accent-dark)}
.btn-ghost,.btn-secondary{min-width:200px;background:var(--panel);border-color:var(--accent);color:var(--accent)}
.btn-ghost:hover,.btn-secondary:hover,.btn-ghost.is-hover{background:var(--groove)}
.btn-small{min-height:44px;min-width:0;padding:10px 16px;font-size:var(--size-small)}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.reveal{transition:opacity var(--reveal-speed) ease,transform var(--reveal-speed) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.counter-stat,[data-count]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:96px;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
.stage{position:relative;max-width:100%;overflow-x:clip;background:linear-gradient(180deg,var(--paper-top) 0,var(--paper-top) 72px,var(--paper-bottom) 760px,var(--bg) 100%)}
.stage-grain{position:absolute;inset:0;width:100%;height:100%;z-index:0;pointer-events:none;opacity:var(--grain-opacity)}
.grain-ink{fill:var(--text)}
.topbar,.hero,.picks{position:relative;z-index:1}
#site-header{position:relative;z-index:50;min-height:var(--header-height)}
.topbar{background:var(--veil);border-bottom:1px solid var(--border)}
.topbar-inner{display:flex;align-items:center;height:var(--header-height);flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none;color:var(--text)}
.brand:hover{text-decoration:none}
.brand-mark{width:32px;height:32px;flex:none}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:var(--weight-brand);letter-spacing:-.01em;color:var(--text)}
.brand-zh{font-size:var(--size-small);font-weight:var(--weight-regular);color:var(--text-muted)}
.tabs{position:relative;align-self:stretch;margin-left:32px;padding-left:16px;min-width:0;flex:1}
.tabs::before{content:"";position:absolute;left:0;top:22px;bottom:22px;width:1px;background:var(--border)}
.tab-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;height:100%;gap:0}
.tab-list li{height:100%;min-width:0}
.tab{position:relative;display:flex;align-items:center;justify-content:center;height:100%;min-height:44px;padding:0 16px;font-size:15px;color:var(--text-muted);white-space:nowrap;transition:color var(--speed)}
.tab::after{content:"";position:absolute;left:16px;right:16px;bottom:-1px;height:2px;background:var(--accent);opacity:0;transition:opacity var(--speed)}
.tab:hover{color:var(--text);text-decoration:none}
.tab:hover::after{opacity:.35}
.tab[aria-current="page"]{color:var(--text)}
.tab[aria-current="page"]::after{opacity:1}
.tools{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;width:auto;padding:0 12px;background:var(--clear);border:0;font-size:var(--size-small);color:var(--text);border-radius:var(--radius-0);white-space:nowrap}
.lang svg{width:18px;height:18px;flex:none}
.lang-text{white-space:nowrap}
.lang-caret{font-size:11px;color:var(--text-muted)}
.lang:hover{color:var(--accent)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:80;min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);box-shadow:var(--panel-shadow);list-style:none}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;color:var(--text)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--groove);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 20px;font-size:var(--size-small);font-weight:var(--weight-medium);color:var(--accent);background:var(--panel);border:1px solid var(--accent);border-radius:var(--radius-0);white-space:nowrap;transition:background-color var(--speed),color var(--speed)}
.login:hover{background:var(--accent);color:var(--on-accent);text-decoration:none}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--radius-0);background:var(--panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none}
.menu-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{position:relative;border-top:1px solid var(--border);background:var(--groove);padding-top:var(--space-8);padding-bottom:var(--space-4);margin-top:var(--space-8)}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,1fr);gap:var(--space-6)}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:34ch;margin-top:var(--space-3);color:var(--text-muted)}
.footer-title{font-size:var(--size-body);font-weight:var(--weight-medium);margin-bottom:var(--space-2)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px;list-style:none}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:var(--space-5);padding-top:var(--space-3);border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:var(--space-3);font-size:var(--size-small);color:var(--text-muted)}
.footer-legal{display:flex;gap:24px;flex-wrap:wrap}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--text)}
@media(max-width:1400px){:root{--size-h1:56px}}
@media(max-width:1280px){.tab{padding-inline:12px}.tab::after{left:12px;right:12px}.tabs{margin-left:24px}}
@media(max-width:1180px){.tabs{margin-left:16px;padding-left:8px}.tab{padding-inline:8px;font-size:var(--size-small)}.tab::after{left:8px;right:8px}.lang{padding-inline:8px}}
@media(max-width:1080px){
  .tabs{display:none}.tools{margin-left:auto}.menu-toggle{display:inline-flex}
  .mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;z-index:60;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer ul{list-style:none}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text)}
  .mobile-drawer a[aria-current]{color:var(--accent);background:var(--groove)}
  .drawer-languages{margin-top:var(--space-3)}
  .menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:55;background:var(--menu-shade);border:0}
  .menu-veil:not([hidden]){display:block}
  .topbar{z-index:70}
}
@media(max-width:768px){
  :root{--size-h1:36px;--size-h2:28px;--size-h3:22px;--gutter:24px}
  .grid-3,.grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:var(--space-4)}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .grid-2,.grid-3,.grid-4{grid-template-columns:minmax(0,1fr)}
  .brand{gap:6px}.brand-en{font-size:17px}.brand-zh{font-size:12px}
  .tools{margin-left:auto;gap:6px}.lang-text{display:none}.lang{padding-inline:8px}.login{padding-inline:14px}
  .actions{margin-top:24px}.actions .btn{flex:1 1 100%;min-width:0}
  .tilt,.tilt-card{transform:none;max-width:100%}
  .section{padding-top:var(--space-6);padding-bottom:var(--space-6)}
  .site-footer{margin-top:var(--space-6)}
}
@media(max-width:360px){:root{--gutter:16px}.brand-mark{width:28px;height:28px}.brand-en{font-size:16px}.tools{gap:4px}.login{padding-inline:10px}.lang{padding-inline:6px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{transition:none!important}
}