:root{
  --bg:#F8F3E9;--bg-top:#FBF7EF;--bg-bottom:#F2EADB;
  --panel:#FFFDF8;--panel-2:#F1E9DA;--border:#E4D9C5;--border-soft:rgba(228,217,197,.72);--chrome:#F7F0E3;--glass:rgba(251,247,239,.84);
  --accent:#2B66D9;--accent-dark:#1D4BA8;--accent-tint:rgba(43,102,217,.10);--accent-tint-2:rgba(43,102,217,.17);--accent-ring:rgba(43,102,217,.20);--accent-wash:rgba(43,102,217,.07);--accent-shadow:rgba(43,102,217,.12);--accent-shadow-strong:rgba(43,102,217,.30);
  --text:#2A231B;--muted:#6E6355;--success:#2F8F5B;--warn:#C98A12;--error:#C8432F;
  --c-orange:#EF7D3A;--c-red:#E05446;--c-yellow:#F2BE3C;--c-purple:#8F6ADB;--c-green:#3E9E68;
  --highlight:#FBE7A6;--highlight-deep:#F8DC8A;--highlight-shadow:rgba(201,138,18,.30);--tape:rgba(242,190,60,.46);
  --white:#FFFFFF;--hl:rgba(255,255,255,.92);--hl-soft:rgba(255,255,255,.55);--hl-on-accent:rgba(255,255,255,.30);--on-accent-dim:rgba(255,255,255,.78);
  --ink-08:rgba(42,35,27,.08);--ink-14:rgba(42,35,27,.14);--ink-30:rgba(42,35,27,.30);--ink-50:rgba(42,35,27,.50);
  --paper-hi:#FFFCF4;--paper-mid:#F7F0E2;--paper-lo:#EEE4D1;--land:#EADFCB;--land-edge:#DCCCB0;--crease:rgba(110,99,85,.17);--crease-line:rgba(110,99,85,.20);
  --flag-red:#D63B2F;--flag-navy:#2E3A6E;--flag-white:#FFFFFF;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-card:20px;--r-inner:14px;--r-btn:12px;--r-sm:8px;--r-pill:999px;--r-circle:50%;
  --gutter:24px;--wrap:1240px;--header-height:64px;--toc-height:64px;--anchor-gap:16px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-6:48px;--space-8:64px;--space-10:80px;
  --size-body:16px;--size-small:14px;--size-h2:36px;--size-h3:24px;
  --shadow-bubble:0 14px 24px -12px rgba(42,35,27,.32);
  --shadow-chip:0 6px 14px -8px rgba(42,35,27,.22);
  --shadow-card:0 24px 56px -24px var(--accent-shadow),inset 0 1px 0 var(--hl);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .165 0 0 0 0 .137 0 0 0 0 .106 0 0 0 .9 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
  --grain-alpha:.03;--ease:cubic-bezier(.2,.7,.3,1);--speed:.2s;--reveal-speed:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--bg);scroll-padding-top:calc(var(--header-height) + var(--anchor-gap));scroll-behavior:smooth}
body{margin:0;min-height:100vh;position:relative;font-family:var(--font-body);font-size:var(--size-body);line-height:1.75;color:var(--text);background:linear-gradient(180deg,var(--bg-top) 0,var(--bg) 520px,var(--bg-bottom) 1000px,var(--bg-bottom) 100%);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;background-image:var(--grain);background-size:180px 180px;opacity:var(--grain-alpha);pointer-events:none;z-index:0}
main,footer{position:relative}
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}
img{max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
::selection{background:var(--highlight);color:var(--text)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.5vw,66px);line-height:1.12;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h2{font-size:var(--size-h2);line-height:1.25;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h3{font-size:var(--size-h3);line-height:1.35;margin:0 0 var(--space-2)}
p{margin:0 0 var(--space-2)}
small{font-size:var(--size-small)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-sm);padding:.12em .35em}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-inner)}
pre code{padding:0;background:none;white-space:pre;overflow-wrap:normal}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-10);padding-bottom:var(--space-10)}
.reading{max-width:840px;margin-inline:auto}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:var(--space-8)}
.prose h3{margin-top:var(--space-4)}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.kicker{font-family:var(--font-mono);font-size:12px;color:var(--muted);letter-spacing:.08em}
.grid-two,.grid-three{display:grid;gap:var(--space-3)}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-two>*,.grid-three>*,.wrap>*{min-width:0}
.panel,.card{padding:var(--space-4);background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-card);min-width:0}
.panel-inset{background:var(--panel-2);border-radius:var(--r-inner);padding:var(--space-3)}
.decor-section{position:relative;overflow-x:clip}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;padding:0 26px;border-radius:var(--r-btn);font-size:16px;font-weight:700;letter-spacing:.01em;line-height:1.3;flex-shrink:0;white-space:nowrap;border:1px solid transparent;transition:transform var(--speed),box-shadow var(--speed),background var(--speed)}
.btn svg{width:18px;height:18px}
.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent),var(--accent-dark));box-shadow:inset 0 1px 0 var(--hl-on-accent),0 1px 2px var(--accent-shadow-strong),0 14px 26px -12px var(--accent-shadow-strong)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hl-on-accent),0 2px 4px var(--accent-shadow-strong),0 18px 32px -12px var(--accent-shadow-strong)}
.btn-ghost,.btn-secondary{color:var(--accent-dark);background:var(--accent-tint)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--accent-tint-2)}
.btn-outline{border-color:var(--text);background:var(--panel)}
.btn-outline:hover{background:var(--panel-2)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;box-shadow:none;pointer-events:none}
.cta-row{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-top:22px}
#site-header,.preview-header{position:sticky;top:0;z-index:60}
.topbar{position:relative;z-index:63;background:var(--glass);-webkit-backdrop-filter:blur(12px) saturate(1.15);backdrop-filter:blur(12px) saturate(1.15);border-bottom:1px solid var(--border-soft)}
.topbar-inner{max-width:var(--wrap);margin:0 auto;height:var(--header-height);padding-inline:var(--gutter);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font-family:var(--font-display);font-size:19px;font-weight:900;letter-spacing:-.02em;line-height:1.2;min-height:32px}
.brand-mark{width:32px;height:32px;display:block;filter:drop-shadow(0 6px 10px var(--accent-shadow-strong))}
.brand-soft{font-weight:500;color:var(--muted)}
.tabs{flex:1;display:flex;justify-content:center;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.tabs li{min-width:0}
.tabs a{position:relative;display:flex;align-items:center;justify-content:center;height:64px;padding-inline:12px;font-size:14.5px;font-weight:500;color:var(--muted);white-space:nowrap;transition:color var(--speed)}
.tabs a::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:3px;border-radius:var(--r-pill);background:var(--border);opacity:0;transform:scaleX(.4);transition:opacity var(--speed),transform .25s}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{opacity:1;transform:scaleX(1)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:700}
.tabs a[aria-current="page"]::after{background:var(--accent);opacity:1;transform:none}
.top-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}
.language-control{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-radius:var(--r-btn);font-size:14px;color:var(--muted);background:transparent;white-space:nowrap;transition:background var(--speed)}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{background:var(--panel-2);color:var(--text)}
.language-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:70;width:184px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-inner);box-shadow:var(--shadow-card)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.language-panel a:hover,.language-panel a[aria-current]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 18px;border-radius:var(--r-btn);border:1.5px solid var(--text);background:var(--panel);font-size:14px;font-weight:700;white-space:nowrap;transition:background var(--speed),color var(--speed)}
.login:hover{background:var(--text);color:var(--panel)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;background:transparent;color:var(--text);border-radius:var(--r-btn)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;transition:transform var(--speed),opacity var(--speed)}
.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)}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;z-index:62;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}
.mobile-drawer ul{list-style:none;padding:0;margin:0}
.mobile-drawer a{display:flex;width:100%;align-items:center;min-height:48px;padding:10px 16px;border-radius:var(--r-btn);font-weight:600}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--panel-2)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:61;background:var(--ink-30)}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);margin-top:var(--space-8);padding-top:var(--space-8);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1.2fr 1fr;gap:var(--space-4)}
.footer-grid>*{min-width:0}
.footer-title{font-size:14px;font-weight:800;margin-bottom:16px}
.footer-brand p{max-width:300px;margin-top:16px;color:var(--muted);font-size:14px}
.footer-links{display:flex;flex-direction:column;align-items:flex-start;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;overflow-wrap:anywhere}
.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity var(--reveal-speed) var(--ease),transform var(--reveal-speed) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:160px;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-4);max-width:100%}
#server-status+*{margin-top:var(--space-4)}
@media(min-width:1101px) and (max-width:1250px){.topbar-inner{gap:16px}.tabs a{padding-inline:8px;font-size:13px}.tabs a::after{left:8px;right:8px}.lang{padding-inline:8px}}
@media(max-width:1100px){.tabs{display:none}.top-actions{margin-left:auto}.menu-toggle{display:flex}}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  h2{font-size:28px}
  .grid-three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .section{padding-top:48px;padding-bottom:48px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .grid-two{grid-template-columns:1fr}
  .topbar-inner{gap:8px}
  .brand{font-size:16px;gap:6px}
  .brand-mark{width:28px;height:28px}
  .top-actions{gap:2px;margin-left:auto}
  .lang{font-size:12px;padding-inline:6px}
  .login{font-size:13px;padding-inline:12px}
  .panel,.card{padding:24px}
  .tilt,.paper-tilt,[data-tilt]{transform:none}
  .decor-section{max-width:100%}
  .footer-grid{gap:24px}
}
@media(max-width:359px){.brand{font-size:14px}.brand-mark{width:24px;height:24px}.lang{padding-inline:4px;font-size:11px}.login{padding-inline:8px}.topbar-inner{gap:4px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}