/* Gray Hole · 站样式基座
 * 令牌与扩展端 / 原型保持同一套 Compound 单色系（见 灰洞-设计说明.md 第二节）。
 * 零依赖、零外部字体、无构建步骤 —— Cloudflare Pages 直接当静态资源收。
 */

:root{
  --gh-canvas:#ffffff;
  --gh-sidebar:#f7f7f7;
  --gh-ink:#161616;
  --gh-body:#565656;
  --gh-soft:#f6f5f6;
  --gh-soft-2:#f1f1f1;
  --gh-line:#e8e8e8;
  --gh-line-strong:#d7d7d7;
  --gh-hover:#cfcfcf;
  --gh-muted:#888888;
  --gh-muted-2:#a4a4a4;
  --gh-danger:#b6463a;
  --gh-on-ink:#ffffff;
  --gh-shadow:0 1px 2px rgba(22,22,22,.04);

  --gh-radius:16px;
  --gh-radius-sm:10px;
  --gh-radius-pill:999px;
  --gh-maxw:1080px;
  --gh-nav-h:64px;

  --gh-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --gh-serif:Georgia,"Songti SC","Noto Serif CJK SC",serif;
  --gh-mono:ui-monospace,SFMono-Regular,"SF Mono",Consolas,"Liberation Mono",monospace;

  color-scheme:light;
}

html[data-theme="dark"]{
  --gh-canvas:#121212;
  --gh-sidebar:#171717;
  --gh-ink:#f2f2f2;
  --gh-body:#a8a8a8;
  --gh-soft:rgba(255,255,255,.07);
  --gh-soft-2:rgba(255,255,255,.11);
  --gh-line:rgba(255,255,255,.10);
  --gh-line-strong:rgba(255,255,255,.24);
  --gh-hover:rgba(255,255,255,.34);
  --gh-muted:#8f8f8f;
  --gh-muted-2:#6b6b6b;
  --gh-danger:#e3a7a0;
  --gh-on-ink:#111111;
  --gh-shadow:none;

  color-scheme:dark;
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--gh-canvas);
  color:var(--gh-ink);
  font:15px/1.75 var(--gh-sans);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

a{color:var(--gh-ink);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}

h1,h2,h3,h4{margin:0;font-weight:600;letter-spacing:-.02em}
p{margin:0 0 1em;color:var(--gh-body)}
ul,ol{margin:0 0 1em;padding-left:1.35em;color:var(--gh-body)}
li{margin:.35em 0}
strong{color:var(--gh-ink);font-weight:600}
hr{border:0;border-top:1px solid var(--gh-line);margin:2.5rem 0}

code,kbd{
  font-family:var(--gh-mono);font-size:.875em;
  background:var(--gh-soft);border:1px solid var(--gh-line);
  padding:.15em .45em;border-radius:6px;overflow-wrap:anywhere;
}
kbd{background:var(--gh-canvas);box-shadow:0 1px 0 var(--gh-line-strong);color:var(--gh-ink)}

img{max-width:100%;height:auto;display:block}

/* ---------- 走马灯：导航 ---------- */
.nav{
  position:sticky;top:0;z-index:50;
  height:var(--gh-nav-h);
  background:color-mix(in srgb,var(--gh-canvas) 82%,transparent);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--gh-line);
}
.nav-in{
  max-width:var(--gh-maxw);margin:0 auto;height:100%;
  padding:0 24px;display:flex;align-items:center;gap:20px;
}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--gh-serif);font-size:19px;letter-spacing:-.01em}
.brand:hover{text-decoration:none}
.brand img{width:26px;height:26px;flex:none}
.brand b{font-weight:600}

.nav-links{display:flex;align-items:center;gap:22px;margin-left:auto;font-size:14px}
.nav-links a{color:var(--gh-body)}
.nav-links a:hover{color:var(--gh-ink)}
.nav-links a[aria-current="page"]{color:var(--gh-ink);font-weight:600}

.icon-btn{
  width:34px;height:34px;flex:none;display:grid;place-items:center;
  border:1px solid var(--gh-line);border-radius:var(--gh-radius-sm);
  background:transparent;color:var(--gh-ink);cursor:pointer;padding:0;
  transition:border-color .18s ease;
}
.icon-btn:hover{border-color:var(--gh-line-strong)}
.icon-btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
html[data-theme="dark"] .icon-sun,
html[data-theme="light"] .icon-moon{display:none}

.nav-toggle{display:none}

/* ---------- 布局 ---------- */
.wrap{max-width:var(--gh-maxw);margin:0 auto;padding:0 24px}
.section{padding:64px 0;border-bottom:1px solid var(--gh-line)}
.section:last-of-type{border-bottom:0}
.section-head{margin-bottom:28px}
.eyebrow{
  font-family:var(--gh-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--gh-muted);
}
h2.title{font-size:27px;margin-top:10px}
.section-head p{margin:10px 0 0;max-width:60ch}

.grid{display:grid;gap:14px}
.grid.c2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid.c3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.c4{grid-template-columns:repeat(4,minmax(0,1fr))}

.card{
  background:var(--gh-canvas);
  border:1px solid var(--gh-line);
  border-radius:var(--gh-radius);
  padding:22px;
  transition:border-color .18s ease;
}
.card:hover{border-color:var(--gh-hover)}
.card h3{font-size:15px;margin-bottom:8px}
.card p{margin:0;font-size:13.5px;line-height:1.7}
.card .num{font-family:var(--gh-mono);font-size:11.5px;color:var(--gh-muted);letter-spacing:.08em;margin-bottom:10px}

.note{
  background:var(--gh-soft);border:1px solid var(--gh-line);
  border-radius:var(--gh-radius);padding:16px 20px;
  font-size:13.5px;line-height:1.75;color:var(--gh-body);
}
.note p{margin:0;font-size:inherit}
.note p + p{margin-top:.7em}
.note strong{color:var(--gh-ink)}
.note.warn{border-color:var(--gh-line-strong)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:var(--gh-radius-sm);
  font-size:14px;font-weight:600;line-height:1.2;
  border:1px solid transparent;cursor:pointer;
  font-family:inherit;
  transition:opacity .18s ease,border-color .18s ease,background .18s ease,transform .12s ease;
}
.btn:hover{text-decoration:none;opacity:.88}
.btn:active{transform:scale(.98)}
.btn.solid{background:var(--gh-ink);color:var(--gh-on-ink)}
.btn.outline{background:transparent;border-color:var(--gh-line);color:var(--gh-ink)}
.btn.outline:hover{border-color:var(--gh-line-strong);opacity:1}
.btn[disabled],.btn[aria-busy="true"]{opacity:.5;cursor:not-allowed;transform:none}
.btn.wide{width:100%}
.btn.sm{padding:8px 14px;font-size:13px}

.actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}

/* ---------- Hero ---------- */
.hero{padding:80px 0 64px;border-bottom:1px solid var(--gh-line)}
.hero h1{
  font-size:clamp(34px,5.4vw,54px);line-height:1.1;letter-spacing:-.045em;
  margin:18px 0 16px;max-width:19ch;
}
.hero .lead{font-size:17.5px;line-height:1.7;max-width:56ch;color:var(--gh-body);margin-bottom:8px}
.hero .actions{margin-top:30px}
.hero-meta{
  margin-top:22px;display:flex;gap:20px;flex-wrap:wrap;
  font-family:var(--gh-mono);font-size:12px;color:var(--gh-muted);
}
.hero-split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-art{
  border:1px solid var(--gh-line);border-radius:var(--gh-radius);
  overflow:hidden;background:var(--gh-soft);
}
.hero-art img{width:100%}

.shot{
  border:1px solid var(--gh-line);border-radius:var(--gh-radius);
  overflow:hidden;background:var(--gh-soft);
}
.shot img{width:100%;display:block}
.shot figcaption{
  font-size:12.5px;color:var(--gh-muted);
  padding:10px 14px;border-top:1px solid var(--gh-line);
  font-family:var(--gh-mono);
}
figure{margin:0}

/* ---------- 表格 ---------- */
table{width:100%;border-collapse:collapse;font-size:14px;margin:0 0 1em}
th,td{text-align:left;padding:11px 16px 11px 0;border-bottom:1px solid var(--gh-line);vertical-align:top}
th{
  font-family:var(--gh-mono);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase;
  color:var(--gh-muted);font-weight:600;white-space:nowrap;
}
td{color:var(--gh-body)}
td:first-child{color:var(--gh-ink);white-space:nowrap}
td code{white-space:nowrap}

/* ---------- 文档页（隐私 / 条款） ---------- */
.doc{max-width:760px;margin:0 auto;padding:56px 24px 80px}
.doc h1{font-size:clamp(28px,4vw,38px);letter-spacing:-.035em;margin-bottom:12px}
.doc .meta{font-family:var(--gh-mono);font-size:12px;color:var(--gh-muted);margin-bottom:36px}
.doc h2{font-size:19px;margin:44px 0 12px;padding-top:20px;border-top:1px solid var(--gh-line)}
.doc h2:first-of-type{border-top:0;padding-top:0}
.doc h3{font-size:15px;margin:24px 0 8px}
.doc p,.doc li{font-size:14.5px;line-height:1.8}
.toc{
  border:1px solid var(--gh-line);border-radius:var(--gh-radius);
  padding:18px 22px;margin-bottom:36px;background:var(--gh-soft);
}
.toc ol{margin:0;padding-left:1.2em;font-size:13.5px}
.toc a{color:var(--gh-body)}
.toc a:hover{color:var(--gh-ink)}

/* ---------- 表单 / 账户 ---------- */
.auth-wrap{max-width:420px;margin:0 auto;padding:56px 24px 80px}
.auth-wrap h1{font-size:27px;margin-bottom:8px}
.auth-wrap .sub{font-size:14px;color:var(--gh-body);margin-bottom:26px}
.panel{border:1px solid var(--gh-line);border-radius:var(--gh-radius);padding:24px}
.field{margin-bottom:14px}
.field label{display:block;font-size:12.5px;font-weight:600;margin-bottom:6px;color:var(--gh-ink)}
.field input{
  width:100%;padding:11px 13px;font-size:14px;font-family:inherit;
  color:var(--gh-ink);background:var(--gh-canvas);
  border:1px solid var(--gh-line);border-radius:var(--gh-radius-sm);
  transition:border-color .18s ease;
}
.field input:focus{outline:none;border-color:var(--gh-ink)}
.field input::placeholder{color:var(--gh-muted-2)}
.hint{font-size:12.5px;color:var(--gh-muted);margin:8px 0 0}

.msg{
  border:1px solid var(--gh-line);border-radius:var(--gh-radius-sm);
  padding:11px 14px;font-size:13.5px;margin-bottom:16px;display:none;
  line-height:1.6;
}
.msg.show{display:block}
.msg.err{border-color:var(--gh-danger);color:var(--gh-danger)}
.msg.ok{border-color:var(--gh-line-strong);color:var(--gh-ink);background:var(--gh-soft)}

.switcher{display:flex;gap:4px;border:1px solid var(--gh-line);border-radius:var(--gh-radius-pill);padding:4px;margin-bottom:24px}
.switcher button{
  flex:1;padding:8px 10px;border:0;border-radius:var(--gh-radius-pill);
  background:transparent;color:var(--gh-muted);font:600 13px var(--gh-sans);
  cursor:pointer;transition:background .18s ease,color .18s ease;
}
.switcher button[aria-selected="true"]{background:var(--gh-ink);color:var(--gh-on-ink)}

.view{display:none}
.view.active{display:block}

.acct-row{
  display:flex;align-items:center;justify-content:space-between;
  gap:14px;padding:14px 0;border-bottom:1px solid var(--gh-line);
  font-size:13.5px;
}
.acct-row:last-child{border-bottom:0}
.acct-row .k{color:var(--gh-muted);font-family:var(--gh-mono);font-size:12px}
.acct-row .v{color:var(--gh-ink);text-align:right;overflow-wrap:anywhere}

/* ---------- 页脚 ---------- */
.foot{border-top:1px solid var(--gh-line);padding:40px 0 56px;font-size:13px;color:var(--gh-muted)}
.foot-in{max-width:var(--gh-maxw);margin:0 auto;padding:0 24px;display:flex;gap:32px;flex-wrap:wrap;justify-content:space-between}
.foot-brand{display:flex;align-items:center;gap:10px;font-family:var(--gh-serif);font-size:16px;color:var(--gh-ink)}
.foot-brand img{width:22px;height:22px}
.foot-cols{display:flex;gap:56px;flex-wrap:wrap}
.foot-col b{display:block;font-size:12px;letter-spacing:.06em;text-transform:uppercase;color:var(--gh-ink);margin-bottom:10px;font-family:var(--gh-mono);font-weight:600}
.foot-col a{display:block;color:var(--gh-muted);margin-bottom:6px}
.foot-col a:hover{color:var(--gh-ink)}
.foot-legal{max-width:var(--gh-maxw);margin:28px auto 0;padding:20px 24px 0;border-top:1px solid var(--gh-line);font-size:12px;line-height:1.9}

/* ---------- 404 ---------- */
.center{display:grid;place-items:center;min-height:60vh;text-align:center}
.center h1{font-size:64px;font-family:var(--gh-serif);letter-spacing:-.04em}

/* ---------- 响应式 ---------- */
@media(max-width:900px){
  .hero-split{grid-template-columns:1fr;gap:32px}
  .grid.c3,.grid.c4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:720px){
  :root{--gh-nav-h:58px}
  .wrap,.foot-in{padding:0 18px}
  .hero{padding:52px 0 44px}
  .section{padding:44px 0}
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
  .nav-toggle{display:grid}
  .nav-links{
    position:fixed;inset:var(--gh-nav-h) 0 auto 0;
    flex-direction:column;align-items:stretch;gap:0;margin:0;
    background:var(--gh-canvas);border-bottom:1px solid var(--gh-line);
    padding:8px 18px 18px;display:none;
  }
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 0;border-bottom:1px solid var(--gh-line);font-size:15px}
  .nav-links .btn{margin-top:12px}
  .doc,.auth-wrap{padding-left:18px;padding-right:18px}
  .foot-in{flex-direction:column;gap:26px}
  .foot-cols{gap:34px}
}

@media(prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}