/* GONJUKU — 图纸 / 制图纸设计系统
   底：暖灰制图纸 + 发丝方格；框：1px 硬边 + 四角十字标记；
   标注色砖红只用于测量标记与警示；结果卡局部深色，整站浅色。 */

:root{
  --paper:#e9e5db;
  --paper-2:#f3f0e9;
  --paper-3:#dfdace;
  --ink:#15171a;
  --ink-2:#53585d;
  --ink-3:#7d8288;
  --rule:#cbc4b5;
  --rule-2:#a8a091;
  --mark:#bf3f24;
  --live:#1d5c58;
  --dark:#141619;
  --dark-2:#20242a;
  --cell:34px;
  --maxw:1140px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0}

body{
  background:var(--paper);
  background-image:
    repeating-linear-gradient(to right, rgba(21,23,26,.055) 0 1px, transparent 1px var(--cell)),
    repeating-linear-gradient(to bottom, rgba(21,23,26,.055) 0 1px, transparent 1px var(--cell));
  color:var(--ink);
  font-family:"Archivo","PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}

.mono{font-family:"IBM Plex Mono",ui-monospace,"Cascadia Mono",Consolas,monospace}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 20px}
.narrow{max-width:780px}

a{color:var(--ink); text-decoration:underline; text-underline-offset:3px; text-decoration-color:var(--rule-2)}
a:hover{text-decoration-color:var(--mark); color:var(--mark)}

/* ---------- 图纸框：四角十字标记 ---------- */
.plate{position:relative; border:1px solid var(--rule-2); background:rgba(243,240,233,.82)}
.plate::before,.plate::after{
  content:"+ +"; position:absolute; left:-.42em; right:-.42em;
  display:flex; justify-content:space-between;
  font-family:"IBM Plex Mono",monospace; font-size:13px; line-height:1;
  color:var(--rule-2); pointer-events:none;
}
.plate::before{top:-.5em}
.plate::after{bottom:-.5em}

/* ---------- 页眉 ---------- */
.masthead{border-bottom:1px solid var(--rule-2); background:rgba(233,229,219,.94); position:relative; z-index:20}
.masthead .wrap{display:flex; align-items:center; gap:16px; min-height:56px; flex-wrap:wrap}
.brand{display:flex; align-items:baseline; gap:10px; text-decoration:none}
.wordmark{
  font-weight:700; font-size:21px; letter-spacing:.14em;
  -webkit-text-stroke:1px var(--ink); color:transparent;
}
.brand:hover .wordmark{-webkit-text-stroke-color:var(--mark)}
.masthead .tag{font-size:10.5px; letter-spacing:.2em; color:var(--ink-2); text-transform:uppercase}
.nav{margin-left:auto; display:flex; gap:18px; align-items:center}
.nav a{
  font-family:"IBM Plex Mono",monospace; font-size:12.5px; letter-spacing:.06em;
  text-decoration:none; color:var(--ink-2); padding:4px 0; border-bottom:1px solid transparent;
}
.nav a:hover,.nav a[aria-current="page"]{color:var(--ink); border-bottom-color:var(--mark)}
@media(max-width:560px){
  .masthead .wrap{padding-top:8px; padding-bottom:8px}
  .masthead .tag{display:none}
  .nav{margin-left:0; width:100%; gap:14px; border-top:1px solid var(--rule); padding-top:7px}
}

/* ---------- 面包屑 ---------- */
.crumb{font-family:"IBM Plex Mono",monospace; font-size:11.5px; color:var(--ink-3); padding:14px 0 0; letter-spacing:.04em}
.crumb a{color:var(--ink-2); text-decoration:none}
.crumb a:hover{color:var(--mark)}
.crumb span{margin:0 6px; color:var(--rule-2)}

/* ---------- 标题层级 ---------- */
h1{font-size:38px; line-height:1.2; font-weight:700; margin:0 0 14px; letter-spacing:-.01em}
h2{font-size:23px; line-height:1.35; font-weight:600; margin:2.2em 0 .7em; letter-spacing:-.005em}
h3{font-size:18px; line-height:1.45; font-weight:600; margin:1.8em 0 .5em}
h1 em,h2 em{font-style:normal; border-bottom:2px solid var(--mark); padding-bottom:2px}
.eyebrow{font-size:11.5px; letter-spacing:.22em; color:var(--mark); text-transform:uppercase; margin:0 0 12px; font-family:"IBM Plex Mono",monospace}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-block; padding:11px 20px; border:1px solid var(--ink);
  background:var(--ink); color:var(--paper-2); text-decoration:none;
  font-size:14px; font-weight:600; letter-spacing:.03em; cursor:pointer;
}
.btn:hover{background:transparent; color:var(--ink); text-decoration:none}
.btn-ghost{background:transparent; color:var(--ink)}
.btn-ghost:hover{background:var(--ink); color:var(--paper-2)}

/* ---------- 邀请码模块 ---------- */
.code-plate{padding:18px 18px 15px}
.code-plate .cap{font-size:11px; letter-spacing:.2em; color:var(--ink-2); text-transform:uppercase; margin:0 0 10px; font-family:"IBM Plex Mono",monospace}
.code-row{display:flex; align-items:stretch; border:1px solid var(--ink); margin:0 0 12px}
.code-val{
  flex:1; padding:9px 12px; font-size:25px; font-weight:600; letter-spacing:.13em;
  background:var(--paper-2); display:flex; align-items:center;
}
.copy-btn{
  border:0; border-left:1px solid var(--ink); background:var(--ink); color:var(--paper-2);
  padding:0 17px; font-size:13px; font-weight:600; letter-spacing:.05em; cursor:pointer;
  font-family:"IBM Plex Mono",monospace; min-width:76px;
}
.copy-btn[data-done="1"]{background:var(--mark)}
.benefit{font-size:14px; margin:0 0 7px; line-height:1.55}
.fine{font-size:11.5px; color:var(--ink-2); margin:0; line-height:1.5}

/* ---------- 首页 ---------- */
.hero{padding:34px 0 26px}
.hero-grid{display:grid; grid-template-columns:1.15fr .85fr; gap:26px; align-items:start}
.deck{font-size:15.5px; color:var(--ink-2); margin:0 0 20px; max-width:34em}

.sec{padding:30px 0}
.sec-head{display:flex; align-items:baseline; gap:12px; border-bottom:1px solid var(--rule-2); padding-bottom:8px; margin-bottom:20px; flex-wrap:wrap}
.sec-head h2{font-size:20px; margin:0}
.sec-head .num{font-family:"IBM Plex Mono",monospace; font-size:11px; letter-spacing:.2em; color:var(--ink-3)}
.sec-head .note{font-size:12.5px; color:var(--ink-2); margin-left:auto}

.card-grid{display:grid; grid-template-columns:repeat(auto-fill,minmax(258px,1fr)); gap:16px}
.card{padding:15px 16px 14px; text-decoration:none; display:block}
.card:hover{background:var(--paper-2); text-decoration:none}
.card .k{font-family:"IBM Plex Mono",monospace; font-size:10.5px; letter-spacing:.18em; color:var(--mark); display:block; margin-bottom:7px}
.card .t{font-size:16px; font-weight:600; color:var(--ink); display:block; margin-bottom:5px; line-height:1.45}
.card .d{font-size:13px; color:var(--ink-2); line-height:1.6; display:block}
.card:hover .t{color:var(--mark)}

.idx{list-style:none; margin:0; padding:0; columns:2; column-gap:34px}
.idx li{break-inside:avoid; border-bottom:1px dotted var(--rule-2); padding:9px 0}
.idx a{text-decoration:none; font-size:14.5px; line-height:1.55; display:block}
.idx a:hover{color:var(--mark)}
.idx .w{font-family:"IBM Plex Mono",monospace; font-size:11px; color:var(--ink-3); float:right; margin-left:10px}
@media(max-width:720px){.idx{columns:1}}

/* ---------- 工具页 ---------- */
.tool-grid{display:grid; grid-template-columns:1.05fr .95fr; gap:22px; align-items:start}
.fields{padding:18px}
.f{display:grid; grid-template-columns:9em 1fr; align-items:center; gap:12px; margin-bottom:12px}
.f label{font-size:12.5px; color:var(--ink-2); letter-spacing:.04em}
.f input,.f select{
  width:100%; padding:10px; border:1px solid var(--rule-2); background:var(--paper-2);
  font-family:"IBM Plex Mono",monospace; font-size:15px; color:var(--ink);
}
.f input:focus,.f select:focus{outline:2px solid var(--mark); outline-offset:-2px}
.seg{display:flex; border:1px solid var(--rule-2)}
.seg button{
  flex:1; padding:13px 0; border:0; background:var(--paper-2); cursor:pointer;
  font-family:"IBM Plex Mono",monospace; font-size:13px; color:var(--ink-2);
}
.seg button+button{border-left:1px solid var(--rule-2)}
.seg button[aria-pressed="true"]{background:var(--ink); color:var(--paper-2)}

.readout{background:var(--dark); color:#eceae5; padding:20px 20px 17px; border:1px solid var(--dark)}
.readout .cap{font-size:11px; letter-spacing:.2em; color:#8b9196; text-transform:uppercase; margin:0 0 6px; font-family:"IBM Plex Mono",monospace}
.big{font-size:44px; font-weight:600; line-height:1.05; letter-spacing:-.01em; margin:0; color:#fff; font-family:"IBM Plex Mono",monospace}
.big small{font-size:15px; font-weight:400; color:#8b9196; margin-left:6px}
.sub-read{display:grid; grid-template-columns:1fr 1fr; gap:10px 16px; margin:14px 0 0; padding-top:12px; border-top:1px solid #2b2f34}
.sub-read div{font-size:12.5px; color:#9aa0a6; line-height:1.5}
.sub-read b{display:block; color:#fff; font-family:"IBM Plex Mono",monospace; font-size:17px; font-weight:500; margin-top:2px}
.gap{margin:14px 0 0; padding-top:12px; border-top:1px solid #2b2f34; font-size:12.5px; color:#9aa0a6; line-height:1.6}
.gap b{color:#e8b4a6; font-weight:500}
.assump{margin:14px 0 0; font-size:12px; color:var(--ink-2); line-height:1.6}
.assump b{font-weight:600; color:var(--ink)}
.warn{margin:12px 0 0; padding:10px 12px; border-left:2px solid var(--mark); font-size:12.5px; background:rgba(191,63,36,.055); line-height:1.6}
.warn b{font-weight:600}

details.guide{margin:22px 0 0; border-top:1px solid var(--rule-2); padding-top:10px}
details.guide summary{cursor:pointer; font-size:14px; font-weight:600; padding:6px 0; list-style:none}
details.guide summary::-webkit-details-marker{display:none}
details.guide summary::before{content:"[+] "; font-family:"IBM Plex Mono",monospace; color:var(--mark); font-size:12px}
details.guide[open] summary::before{content:"[–] "}
details.guide .body{padding:4px 0 10px}
details.guide h3{margin-top:1.2em}

/* ---------- 文章 ---------- */
.art{padding:6px 0 40px}
.art-meta{font-family:"IBM Plex Mono",monospace; font-size:11.5px; color:var(--ink-3); margin:0 0 22px; letter-spacing:.03em}
.art-meta a{color:var(--ink-2)}
.lede{font-size:17px; line-height:1.75; color:var(--ink); border-left:2px solid var(--mark); padding-left:16px; margin:0 0 26px}
.art-body{font-size:16.5px; line-height:1.85}
.art-body p{margin:0 0 1.1em}
.art-body ul,.art-body ol{margin:0 0 1.2em; padding-left:1.3em}
.art-body li{margin-bottom:.45em}
.art-body strong{font-weight:600}
.art-body blockquote{margin:1.4em 0; padding:2px 0 2px 16px; border-left:2px solid var(--rule-2); color:var(--ink-2); font-size:15.5px}

.toc{padding:15px 17px; margin:0 0 30px; font-size:14px}
.toc .cap{font-family:"IBM Plex Mono",monospace; font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--ink-2); margin:0 0 8px}
.toc ol{margin:0; padding-left:1.4em}
.toc li{margin-bottom:3px}
.toc a{text-decoration:none}
.toc a:hover{color:var(--mark)}

.tbl-wrap{overflow-x:auto; margin:0 0 1.4em; border:1px solid var(--rule-2)}
table{border-collapse:collapse; width:100%; font-size:14px; background:rgba(243,240,233,.7)}
th,td{padding:9px 12px; text-align:left; border-bottom:1px solid var(--rule); vertical-align:top}
th{font-weight:600; font-size:12.5px; letter-spacing:.04em; background:var(--paper-3); white-space:nowrap}
td.num,th.num{font-family:"IBM Plex Mono",monospace; text-align:right; white-space:nowrap}
tr:last-child td{border-bottom:0}

.callout{border:1px solid var(--rule-2); border-left:2px solid var(--mark); padding:13px 16px; margin:1.5em 0; font-size:15px; background:rgba(243,240,233,.75)}
.callout p:last-child{margin-bottom:0}
.callout .cap{font-family:"IBM Plex Mono",monospace; font-size:10.5px; letter-spacing:.18em; text-transform:uppercase; color:var(--mark); margin:0 0 6px}

.faq{margin:2.4em 0 0}
.faq h2{margin-bottom:.4em}
.faq details{border-bottom:1px solid var(--rule-2); padding:4px 0}
.faq summary{cursor:pointer; font-size:15.5px; font-weight:600; padding:10px 0; list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"— "; color:var(--mark)}
.faq details[open] summary::before{content:"× "}
.faq .a{padding:0 0 12px; font-size:15px; color:var(--ink-2); line-height:1.75}
.faq .a p{margin:0 0 .7em}
.faq .a p:last-child{margin-bottom:0}

figure.article-cover{margin:0 0 26px}
figure.article-cover img{width:100%; height:auto; display:block; border:1px solid var(--rule-2)}
figure.article-cover figcaption{font-size:11.5px; color:var(--ink-3); margin-top:7px; font-family:"IBM Plex Mono",monospace}

.related{margin:34px 0 0; padding-top:16px; border-top:1px solid var(--rule-2)}
.related .cap{font-family:"IBM Plex Mono",monospace; font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--ink-2); margin:0 0 10px}
.related ul{list-style:none; margin:0; padding:0; display:grid; grid-template-columns:repeat(auto-fill,minmax(240px,1fr)); gap:8px 20px}
.related li{font-size:14px; border-bottom:1px dotted var(--rule-2); padding-bottom:6px}
.related a{text-decoration:none}

/* ---------- 页脚 ---------- */
footer.site{border-top:1px solid var(--rule-2); margin-top:20px; padding:22px 0 40px; font-size:12.5px; color:var(--ink-2); background:rgba(223,218,206,.5)}
footer.site .cols{display:grid; grid-template-columns:1.4fr 1fr 1fr; gap:20px; margin-bottom:18px}
footer.site h3{font-family:"IBM Plex Mono",monospace; font-size:10.5px; letter-spacing:.2em; text-transform:uppercase; color:var(--ink-3); margin:0 0 8px; font-weight:500}
footer.site ul{list-style:none; margin:0; padding:0}
footer.site li{margin-bottom:5px}
footer.site a{text-decoration:none; color:var(--ink-2)}
footer.site a:hover{color:var(--mark)}
footer.site .disc{border-top:1px solid var(--rule-2); padding-top:12px; line-height:1.7}
footer.site .disc p{margin:0 0 5px}
@media(max-width:680px){footer.site .cols{grid-template-columns:1fr 1fr}}

/* ---------- 404 ---------- */
.four{padding:60px 0; text-align:left}
.four .code{font-family:"IBM Plex Mono",monospace; font-size:80px; color:var(--rule-2); line-height:1; margin:0 0 10px}

/* ---------- 响应式 ---------- */
@media(max-width:820px){
  .hero-grid,.tool-grid{grid-template-columns:1fr; gap:18px}
  h1{font-size:30px}
  h2{font-size:20px}
  .hero{padding:22px 0 18px}
  .hero-copy{display:contents}
  .hero-lead{order:1}
  .code-plate{order:2}
  .hero-cta{order:3}
  .deck{display:none}
  .art-body{font-size:16px}
}
@media(max-width:400px){
  h1{font-size:25px; margin-bottom:10px}
  .code-val{font-size:22px}
  .big{font-size:36px}
  .f{grid-template-columns:1fr; gap:5px}
  .sub-read{grid-template-columns:1fr}
}