/* ===== Writer B 页面公共样式（features / format / usecases 共用，各页一份拷贝） ===== */
.doc-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:48px;padding-top:48px;padding-bottom:96px;align-items:start}
.doc-main{min-width:0}
.doc-toc{position:sticky;top:84px;max-height:calc(100vh - 104px);overflow:auto;font-size:14px}
.doc-toc-h{font-size:12.5px;font-weight:600;letter-spacing:1px;color:var(--muted);margin:0 0 10px 12px}
.doc-toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--border)}
.doc-toc li a{display:block;padding:6px 12px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);line-height:1.45}
.doc-toc li a:hover{color:var(--strong);text-decoration:none}
.doc-toc li a.on{color:var(--accent);border-left-color:var(--accent);font-weight:600}
.tg{display:inline-flex;align-items:center;font-size:12px;font-weight:600;padding:1px 9px;border-radius:5px;border:1px solid;white-space:nowrap;line-height:1.6}
.tg.t-free{color:#3B6E39;border-color:#BFD9BD;background:#F5FAF4}
.tg.t-std{color:#005FB8;border-color:#B6D2EE;background:#F2F7FC}
.tg.t-pro{color:#fff;border-color:transparent;background:linear-gradient(90deg,var(--g1),var(--g2))}
.badge{white-space:nowrap}
.doc-main code,.uc code{font-family:var(--mono);font-size:.88em;background:#F0F0F0;padding:0 5px;border-radius:4px;word-break:break-word}
kbd{font-family:var(--mono);font-size:.82em;border:1px solid var(--border-strong);border-bottom-width:2px;border-radius:4px;padding:0 5px;background:#FAFAFA;color:var(--strong)}
.cb{margin:18px 0}
.cb .bar{justify-content:flex-start}
.cb-note{margin-left:auto;font-family:var(--font);font-size:12px;color:var(--muted)}
.cb pre{font-size:13px;line-height:1.7;max-height:none}
.cb pre code{background:none;padding:0;font-size:inherit;word-break:normal}
.cb .c-f{color:#795E26}
.src{font-size:12.5px;color:#8A8A8A;margin-top:-8px}
.doc-main .callout{margin:0 0 24px}
.doc-main .table-wrap{margin:18px 0}
@media (max-width:1024px){
  .doc-layout{grid-template-columns:1fr;gap:0;padding-top:24px}
  .doc-toc{position:static;max-height:none;margin-bottom:28px;border:1px solid var(--border);border-radius:var(--radius);padding:14px 10px 10px;background:var(--bg)}
  .doc-toc ol{border-left:0;display:flex;flex-wrap:wrap;gap:6px}
  .doc-toc li a{border:1px solid var(--border);border-radius:999px;padding:3px 12px;margin:0;background:#fff;font-size:13.5px}
  .doc-toc li a.on{border-color:var(--accent)}
}
@media (max-width:760px){
  .doc-layout{padding-bottom:64px}
  .cb pre{font-size:12px;padding:14px}
}
.page-hero h1 .hl{display:inline-block}
/* ===== usecases.html ===== */
.uc-index{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:30px auto 0;max-width:900px}
.uc-chip{display:inline-flex;align-items:center;gap:8px;font-size:14px;padding:5px 14px 5px 6px;border:1px solid var(--border);border-radius:999px;background:var(--surface);color:var(--text)}
.uc-chip span{font-family:var(--mono);font-size:11.5px;font-weight:700;color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:1px 7px}
.uc-chip:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.uc-callout{margin:36px auto 0;max-width:900px}
section.uc{padding:72px 0;scroll-margin-top:60px}
section.uc.alt{background:var(--bg);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.uc-head{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.uc-num{font-family:var(--mono);font-size:13px;font-weight:700;color:#fff;background:linear-gradient(90deg,var(--g1),var(--g2));padding:2px 10px;border-radius:6px}
.uc-sub{font-size:13px;font-weight:600;letter-spacing:1px;color:var(--accent)}
.uc h2{font-size:32px;letter-spacing:-.3px}
.uc-badges{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:14px 0 0}
.uc-tn{font-size:12.5px;color:var(--muted)}
.uc-intro{color:var(--muted);font-size:16.5px;max-width:860px;margin-top:16px;line-height:1.8}
.uc-grid{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:32px;margin-top:32px;align-items:start}
.uc h3{font-size:15px;color:var(--strong);margin-bottom:14px;letter-spacing:.5px}
.steps{list-style:none;counter-reset:s;margin:0;padding:0;position:relative}
.steps li{counter-increment:s;position:relative;padding:0 0 20px 50px;min-height:34px}
.steps li::before{content:counter(s);position:absolute;left:0;top:-2px;width:32px;height:32px;border-radius:50%;background:var(--surface);border:1.5px solid var(--accent);color:var(--accent);font-weight:700;font-size:14px;display:grid;place-items:center;z-index:1}
.steps li::after{content:"";position:absolute;left:15.5px;top:32px;bottom:2px;width:1.5px;background:#CFE0F2}
.steps li:last-child{padding-bottom:0}
.steps li:last-child::after{display:none}
.uc.alt .steps li::before{background:var(--bg)}
.uc-side{display:flex;flex-direction:column;gap:12px}
.uc-who{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px}
.uc-who h3{margin-bottom:6px}
.uc-who p{color:var(--text);font-size:15px}
.uc-note{display:flex;gap:12px;border-radius:var(--radius);padding:14px 16px;font-size:14.5px;border:1px solid var(--border);background:var(--surface)}
.uc-note span{flex:none;width:22px;height:22px;border-radius:50%;display:grid;place-items:center;font-size:12px;font-weight:700;margin-top:2px}
.uc-note p{color:var(--text);line-height:1.7}
.n-ok span{background:var(--accent-soft);color:var(--accent)}
.n-warn{background:#FFFBF0;border-color:#F1DFB0}.n-warn span{background:#FBE9BE;color:#8A5A00}
.n-plan span{background:#FFF4E0;color:#9A5B00}
/* 场景 0 */
.uc.core{background:linear-gradient(180deg,#F5F9FE,#FFFFFF)}
.loop{display:grid;grid-template-columns:1fr 200px 1fr;gap:18px;align-items:center;margin-top:30px;max-width:900px}
.loop-col{border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px;background:var(--surface);display:flex;flex-direction:column;align-items:stretch;text-align:center}
.loop-col.hu{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.loop-h{font-size:12.5px;font-weight:700;letter-spacing:1px;color:var(--muted);margin-bottom:10px}
.loop-col.hu .loop-h{color:var(--accent)}
.loop-n{padding:8px 10px;border-radius:8px;background:#F4F6F8;font-size:14.5px;color:var(--strong)}
.loop-n.strong{background:linear-gradient(90deg,var(--g1),var(--g2));color:#fff;font-weight:600}
.loop-arrow{color:#9AB8D8;font-size:14px;line-height:1.4}
.loop-mid{display:flex;flex-direction:column;gap:14px}
.loop-tag{font-size:13px;text-align:center;padding:6px 8px;border-radius:999px;background:var(--accent-soft);color:var(--accent);font-weight:600}
.loop-tag.back{background:#F0F0F0;color:var(--muted)}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:22px;max-width:900px}
.three div{border-left:3px solid var(--accent);padding:4px 0 4px 14px}
.three b{color:var(--strong)}
.three p{color:var(--muted);font-size:14.5px}
.uc-end{padding:72px 0 96px}
@media (max-width:900px){
  .uc-grid{grid-template-columns:1fr}
}
@media (max-width:760px){
  section.uc{padding:52px 0}
  .uc h2{font-size:25px}
  .uc-intro{font-size:15.5px}
  .loop{grid-template-columns:1fr;gap:10px}
  .loop-mid{flex-direction:row;justify-content:center;flex-wrap:wrap;gap:8px}
  .three{grid-template-columns:1fr}
  .uc-chip{font-size:13px}
  .uc-end{padding:56px 0 64px}
}
.loop-tag::after{content:" →"}
.loop-tag.back::after{content:""}
.loop-tag.back::before{content:"← "}
@media (max-width:760px){
  .loop-tag::after{content:" ↓"}
  .loop-tag.back::after{content:""}
  .loop-tag.back::before{content:"↑ "}
}
.uc-gallery{margin-top:30px;padding-top:24px;border-top:1px dashed var(--border)}
.uc-gallery h3{font-size:16px;margin-bottom:14px;display:flex;align-items:baseline;gap:10px}
.uc-gh{font-size:12.5px;font-weight:400;color:var(--muted)}