:root {
  --bg:#F6EEDF;
  --bg-panel:#FFFCF6;
  --bg-panel-2:#EFE4D0;
  --bg-sidebar:#F9F2E6;
  --border:#E2D5BE;
  --border-soft:rgba(226,213,190,.7);
  --accent:#2A55C9;
  --accent-deep:#2449B6;
  --accent-dark:#1C3C93;
  --accent-tint:#E2E9F8;
  --accent-a06:rgba(42,85,201,.06);
  --accent-a10:rgba(42,85,201,.10);
  --accent-a12:rgba(42,85,201,.12);
  --accent-a16:rgba(42,85,201,.16);
  --accent-a22:rgba(42,85,201,.22);
  --accent-a40:rgba(42,85,201,.40);
  --text:#2A2118;
  --text-muted:#6E6253;
  --text-faint:#8E8170;
  --success:#2F8A55;
  --warn:#C98A1B;
  --error:#C2412F;
  --on-accent:#FFFFFF;
  --on-accent-soft:rgba(255,255,255,.82);
  --on-accent-a16:rgba(255,255,255,.16);
  --on-accent-a22:rgba(255,255,255,.22);
  --hero-top:#FBF6EC;
  --hero-bottom:#F1E6D2;
  --wall-a:#F3D9B8;
  --wall-b:#FBF3E4;
  --wall-glow:rgba(255,252,246,.65);
  --hill-a:#E8C7A1;
  --hill-b:#EED6B8;
  --tint-red:#F7DCD4;
  --ink-red:#A63A2B;
  --tint-blue:#DCE5F8;
  --ink-blue:#1C3C93;
  --tint-purple:#E8DFF4;
  --ink-purple:#66469A;
  --tint-yellow:#F6E6BC;
  --ink-yellow:#80590C;
  --tint-green:#DCEEE1;
  --dot-red:#E5705F;
  --dot-yellow:#E3B54B;
  --dot-green:#62B375;
  --flag-red:#D33B31;
  --flag-white:#FFFFFF;
  --flag-blue:#27407F;
  --flag-edge:rgba(42,33,24,.16);
  --ink-a06:rgba(42,33,24,.06);
  --ink-a10:rgba(42,33,24,.10);
  --ink-a18:rgba(42,33,24,.18);
  --ink-a28:rgba(42,33,24,.28);
  --light-a08:rgba(255,252,246,.08);
  --light-a80:rgba(255,252,246,.8);
  --clear:transparent;
  --radius-sm:6px;
  --radius:8px;
  --radius-lg:10px;
  --radius-frame:18px;
  --radius-pill:999px;
  --font-display:"Iowan Old Style","Palatino Linotype",Georgia,"Songti SC","STSong","Noto Serif SC","SimSun",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --size-body:16px;
  --size-small:14px;
  --size-h1:clamp(52px,4.6vw,66px);
  --size-h2:clamp(28px,3vw,40px);
  --size-h3:22px;
  --weight-body:400;
  --weight-display:500;
  --weight-medium:600;
  --weight-bold:700;
  --leading-body:1.6;
  --leading-title:1.15;
  --tracking-title:-.02em;
  --gutter:32px;
  --content-width:1200px;
  --reading-width:800px;
  --header-height:64px;
  --toc-offset:136px;
  --section-space:88px;
  --shadow-panel:0 20px 56px -24px var(--accent-a10);
  --shadow-menu:0 18px 40px -16px var(--accent-a22),0 2px 6px -2px var(--ink-a10);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .165 0 0 0 0 .13 0 0 0 0 .094 0 0 0 .03 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  --cols:212px minmax(0,1fr) minmax(0,.92fr);
}
*,*::before,*::after {box-sizing:border-box}
html {-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--header-height) + 16px);scroll-behavior:smooth}
body {margin:0;background:var(--grain),var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-body);line-height:var(--leading-body);-webkit-font-smoothing:antialiased}
img,svg {vertical-align:middle;max-width:100%}
img {height:auto}
button,input,select,textarea {font:inherit;color:inherit}
button {background:none;border:0;padding:0;cursor:pointer}
a {color:var(--accent);text-decoration:none}
a:hover {text-decoration:underline;text-underline-offset:4px}
button,a,summary {touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible {outline:2px solid var(--accent);outline-offset:3px}
[hidden] {display:none!important}
h1,h2,h3,h4,p,figure {margin-top:0}
h1,h2,h3 {color:var(--text);font-family:var(--font-display);font-weight:var(--weight-display);line-height:var(--leading-title);letter-spacing:var(--tracking-title);text-wrap:balance}
h1 {font-size:var(--size-h1);margin-bottom:24px}
h2 {font-size:var(--size-h2);margin-bottom:20px}
h3 {font-size:var(--size-h3);margin-bottom:12px}
p {margin-bottom:20px}
ul,ol {padding-left:24px}
li {margin-bottom:6px}
hr {border:0;border-top:1px solid var(--border);margin:32px 0}
code,kbd,pre {font-family:var(--font-mono)}
code {overflow-wrap:anywhere;font-size:.9em;background:var(--bg-panel-2);border-radius:var(--radius-sm);padding:2px 5px}
pre {max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--radius);font-size:var(--size-small)}
pre code {overflow-wrap:normal;white-space:pre;padding:0;background:none}
table {border-collapse:collapse}
th,td {text-align:left}
input,select,textarea {max-width:100%;border:1px solid var(--border);border-radius:var(--radius);background:var(--bg-panel);padding:12px}
::selection {background:var(--accent-tint);color:var(--accent-dark)}
.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)}
.section {padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head {max-width:760px;margin:0 auto 36px;text-align:center}
.grid {display:grid;gap:24px}
.grid-three {grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five {grid-template-columns:repeat(5,minmax(0,1fr))}
.grid > *, .wrap > *, .reading-wrap > * {min-width:0}
.panel,.card {background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-panel)}
.card {padding:28px}
.panel-inset {background:var(--bg-panel-2);border-radius:var(--radius);box-shadow:inset 0 1px 2px var(--ink-a10);padding:20px}
.muted {color:var(--text-muted)}
.mono {font-family:var(--font-mono)}
.no-break {white-space:nowrap}
.icon {width:20px;height:20px;flex-shrink:0}
.s {fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.f {fill:currentColor}
.sprite {position:absolute;width:0;height:0;overflow:hidden}
.fl-r {fill:var(--flag-red)}
.fl-w {fill:var(--flag-white)}
.fl-b {fill:var(--flag-blue)}
.fl-edge {fill:none;stroke:var(--flag-edge);stroke-width:.8}
.flag {display:block;flex:none;width:20px;height:14px;overflow:hidden;border-radius:3px}
.hill-a {fill:var(--hill-a)}
.hill-b {fill:var(--hill-b)}
.btn {display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:12px 26px;border:1px solid var(--clear);border-radius:var(--radius);font-size:var(--size-body);font-weight:var(--weight-medium);line-height:1.3;white-space:nowrap;flex-shrink:0;text-decoration:none}
.btn:hover {text-decoration:none}
.btn svg {width:16px;height:16px;flex-shrink:0}
.btn-primary {background:linear-gradient(180deg,var(--accent),var(--accent-deep));color:var(--on-accent);box-shadow:inset 0 1px 0 var(--on-accent-a22),0 12px 26px -12px var(--accent-a40)}
.btn-primary:hover,.btn-primary.is-hover {background:var(--accent-dark)}
.btn-ghost,.btn-secondary {background:var(--bg-panel);color:var(--text);border-color:var(--border);box-shadow:0 1px 0 var(--ink-a06)}
.btn-ghost:hover,.btn-secondary:hover {border-color:var(--text-faint)}
.btn:active {transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"] {opacity:.55;cursor:not-allowed}
.btn-small {min-height:36px;padding:8px 16px;font-size:var(--size-small)}
.topbar {position:relative;z-index:100;border-bottom:1px solid var(--border-soft)}
.topbar-inner {max-width:var(--content-width);height:var(--header-height);margin:0 auto;padding:0 var(--gutter);display:flex;align-items:center;gap:40px;flex-wrap:nowrap}
.brand {display:inline-flex;align-items:center;gap:10px;flex:none;color:var(--text);text-decoration:none}
.brand:hover {text-decoration:none}
.brand-mark {width:26px;height:26px;display:block}
.brand-en {font-size:19px;font-weight:var(--weight-bold);letter-spacing:-.01em;color:var(--text)}
.brand-zh {font-size:13px;font-weight:var(--weight-body);color:var(--text-muted);padding-left:10px;border-left:1px solid var(--border)}
.mainnav {flex:1;min-width:0}
.mainnav ul {display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.mainnav li {margin:0}
.nav-link {position:relative;display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:36px;padding:0 12px;border-radius:var(--radius-sm);font-size:15px;color:var(--text);white-space:nowrap;text-decoration:none}
.nav-link:hover,.nav-link:focus-visible {background:var(--bg-panel-2);text-decoration:none}
.nav-link[aria-current="page"] {font-weight:var(--weight-medium)}
.nav-link[aria-current="page"]::after {content:"";position:absolute;left:50%;bottom:2px;width:4px;height:4px;margin-left:-2px;border-radius:var(--radius-pill);background:var(--accent)}
.nav-link svg {width:14px;height:14px;color:var(--text-muted)}
.nav-more {position:relative}
.more-menu {display:none;position:absolute;z-index:110;top:calc(100% + 6px);left:0;min-width:168px;padding:6px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-menu)}
.more-menu a {display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--radius-sm);font-size:var(--size-small);color:var(--text)}
.more-menu a:hover {background:var(--bg-panel-2);text-decoration:none}
.nav-more.is-open .more-menu,.nav-more:focus-within .more-menu {display:block}
.topbar-side {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:36px;min-width:44px;width:auto;padding:0 10px;border-radius:var(--radius-sm);font-size:var(--size-small);color:var(--text-muted)}
.lang span {white-space:nowrap}
.lang svg {width:15px;height:15px;flex-shrink:0}
.lang:hover {background:var(--bg-panel-2)}
.lang-menu {display:none;position:absolute;z-index:120;right:0;top:calc(100% + 8px);width:184px;padding:6px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-menu)}
.language.is-open .lang-menu {display:block}
.lang-menu a {display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-sm);color:var(--text)}
.lang-menu a:hover,.lang-menu a[aria-current="true"] {background:var(--accent-tint);color:var(--accent-dark);text-decoration:none}
.login {display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border-radius:var(--radius);background:var(--bg-panel);border:1px solid var(--border);font-size:var(--size-small);font-weight:var(--weight-medium);color:var(--text);box-shadow:0 1px 0 var(--ink-a06);white-space:nowrap}
.login:hover {border-color:var(--text-faint);text-decoration:none}
.hamburger {display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--radius);color:var(--text)}
.hamburger svg {width:22px;height:22px;display:block}
.mobile-drawer {display:none;position:fixed;z-index:90;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:20px var(--gutter) 40px}
.mobile-drawer a {display:flex;align-items:center;width:100%;min-height:46px;padding:10px 14px;color:var(--text);border-radius:var(--radius);text-decoration:none}
.mobile-drawer a:hover,.mobile-drawer a[aria-current] {background:var(--accent-tint);color:var(--accent-dark)}
.drawer-label {display:block;margin:24px 14px 8px;font-size:var(--size-small);color:var(--text-muted)}
html.nav-open {overflow:hidden}
.site-footer {border-top:1px solid var(--border);background:var(--bg-sidebar);padding-top:56px;padding-bottom:32px}
.footer-grid {display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.footer-grid > * {min-width:0}
.footer-brand p {max-width:300px;margin-top:20px;color:var(--text-muted);font-size:var(--size-small)}
.footer-heading {font:var(--weight-medium) var(--size-small)/1.6 var(--font-body);margin-bottom:16px;color:var(--text)}
.footer-links {list-style:none;margin:0;padding:0}
.footer-links li {margin:0}
.footer-links a {display:inline-flex;align-items:center;min-height:32px;padding-block:3px;color:var(--text-muted);font-size:var(--size-small)}
.footer-bottom {display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border);color:var(--text-muted);font-size:13px}
.footer-legal {display:flex;gap:20px;flex-wrap:wrap}
.footer-legal a {display:inline-flex;align-items:center;min-height:28px;color:var(--text-muted)}
.reveal {transition:opacity .35s ease,transform .35s ease}
.reveal.pending {opacity:0;transform:translateY(16px)}
.reveal.shown {opacity:1;transform:none}
#server-status {display:grid;position:relative;min-width:0;width:100%;max-width:100%;overflow:hidden;margin:24px 0}
#server-status + * {margin-top:24px}
.prose {overflow-wrap:break-word;line-height:1.85}
.prose h2 {margin-top:48px}
.prose h3 {margin-top:32px}
.prose a {text-decoration:underline;text-underline-offset:3px}
.prose li {margin-bottom:10px}
.prose section[id] {scroll-margin-top:calc(var(--header-height) + 16px)}
.decorated-section {position:relative;overflow-x:clip;max-width:100%}
@media (min-width:1025px) {
  .nav-more:hover .more-menu {display:block}
}
@media (max-width:1100px) {
  .topbar-inner {gap:24px}
  .nav-link {padding-inline:9px}
}
@media (max-width:1024px) {
  .mainnav {display:none}
  .hamburger {display:inline-flex}
  .topbar-side {margin-left:auto}
  .mobile-drawer.is-open {display:block}
  .footer-grid {grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-five {grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:768px) {
  :root {--gutter:16px;--section-space:56px;--size-h1:38px}
  h1 {font-size:var(--size-h1);line-height:1.15}
  .topbar-inner {gap:12px}
  .brand-zh {display:none}
  .grid-three {grid-template-columns:minmax(0,1fr)}
  .grid-five {grid-template-columns:repeat(2,minmax(0,1fr))}
  .card {padding:22px}
}
@media (max-width:640px) {
  .no-break {white-space:normal}
  .tilt,[data-tilt] {transform:none}
  .decorated-section {max-width:100%;overflow-x:clip}
  .lang span {display:none}
  .topbar-side {gap:4px;margin-left:auto}
  .brand {gap:7px}
  .brand-en {font-size:17px}
  .brand-mark {width:24px;height:24px}
  .login {padding-inline:12px}
  .footer-grid {grid-template-columns:minmax(0,1fr);gap:24px}
}
@media (prefers-reduced-motion:reduce) {
  html {scroll-behavior:auto}
  *,*::before,*::after {animation:none!important;transition:none!important}
  .reveal,.reveal.pending {opacity:1;transform:none}
}