:root{--fg:#1f2328;--muted:#656d76;--bg:#f6f8fa;--card:#fff;--line:#d0d7de;--accent:#0969da;--ok:#1a7f37;--warn:#bf8700}
*{box-sizing:border-box}
body{margin:0;font-family:"Noto Sans CJK SC","PingFang SC","Microsoft YaHei",sans-serif;color:var(--fg);background:var(--bg);line-height:1.65}
header{background:#24292f;color:#fff;padding:28px 24px}
header h1{margin:0;font-size:28px}header p{margin:6px 0 0;color:#c9d1d9}
header a{color:#c9d1d9;text-decoration:none;margin-right:16px}
main{max-width:1000px;margin:0 auto;padding:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:20px 24px;margin-bottom:20px;overflow-wrap:anywhere}
.card h2{margin-top:0;font-size:20px}
.empty{color:var(--muted);font-size:18px;padding:12px 0}
.kv{display:grid;grid-template-columns:7em 1fr;gap:6px 12px;margin:0 0 12px}
.kv dt{color:var(--muted)}.kv dd{margin:0}
.bar{height:14px;background:#eaeef2;border-radius:7px;overflow:hidden;margin:6px 0 4px}
.bar>span{display:block;height:100%;background:var(--ok)}
table{width:100%;border-collapse:collapse;font-size:14px}
th,td{border-bottom:1px solid var(--line);padding:6px 8px;text-align:left;vertical-align:top}
th{background:#f6f8fa}
.st-done{color:var(--ok);font-weight:600}.st-doing{color:var(--accent);font-weight:600}.st-todo{color:var(--muted)}
.lv{display:inline-block;padding:0 6px;border-radius:4px;background:#ddf4ff;font-size:12px}
ul.list{padding-left:20px}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:12px}
.gallery figure{margin:0;border:1px solid var(--line);border-radius:8px;padding:8px;background:#fff}
.gallery img{width:100%;height:auto}
.gallery figcaption{font-size:13px;color:var(--muted)}
article img{max-width:100%}
pre{background:#f6f8fa;padding:12px;overflow:auto;border-radius:6px}
footer{text-align:center;color:var(--muted);font-size:13px;padding:24px}
.chap-meta{color:#57606a;font-size:13px}
/* pcb-design：章节表列多，放宽主体并防止状态/难度标签被挤成竖排 */
main{max-width:1200px}
td.st-done,td.st-doing,td.st-todo,.lv{white-space:nowrap}
table{table-layout:auto}
/* pcb-design：返回按钮 / 面包屑 / 上一章下一章（由 postbuild.py 注入） */
.pcb-nav{margin:0 0 16px;display:flex;flex-direction:column;gap:8px}
.pcb-nav-bottom{margin:20px 0 0}
.pcb-row{display:flex;align-items:center;gap:10px 14px;flex-wrap:wrap}
.pcb-back{display:inline-block;background:#24292f;color:#fff!important;text-decoration:none;padding:8px 14px;border-radius:8px;font-weight:600;white-space:nowrap}
.pcb-back:hover{background:#0969da}
.pcb-home{background:#57606a}
.pcb-crumb{color:var(--muted);font-size:14px;min-width:0}
.pcb-crumb a{color:var(--accent);text-decoration:none}
.pcb-pn{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;font-size:14px}
.pcb-pn a{color:var(--accent);text-decoration:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:6px 10px;max-width:100%}
.pcb-pn .pcb-next{margin-left:auto}
.pcb-imgpage main{max-width:1200px}
.pcb-fig{margin:0;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px}
.pcb-fig img{display:block;max-width:100%;height:auto;margin:0 auto}
.pcb-fig figcaption{margin-top:8px;font-size:14px;color:var(--muted)}
@media (max-width:600px){main{padding:14px}.card{padding:16px}header{padding:20px 16px}table{display:block;overflow-x:auto}}