:root{--bg:#f7f2e9;--card:#fffdf7;--ink:#1d1a14;--muted:#6b6252;--line:#d8cdb4;--accent:#9a2f22;--gold:#b98a2e;--soft:#efe6d2}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Songti SC","Noto Serif SC",STSong,serif;line-height:1.7;font-size:17px}
body.dark{--bg:#171713;--card:#23231f;--ink:#f0ead9;--muted:#b8b0a0;--line:#4a463c;--accent:#e0785f;--gold:#d9ab4a;--soft:#2c2a24}
button,input{font:inherit}
button{cursor:pointer}
.masthead{max-width:920px;margin:0 auto;padding:48px 20px 12px}
.masthead-top{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:14px}
.masthead-top button{background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:6px 12px}
.kicker{letter-spacing:.22em;color:var(--accent);font-weight:700;margin:28px 0 4px}
h1{font-size:68px;line-height:1.05;margin:0;letter-spacing:.02em}
.subtitle{font-size:22px;margin:6px 0}
.lede{font-size:18px;max-width:760px}
.rule-double{border-top:3px solid var(--ink);border-bottom:1px solid var(--ink);height:5px;margin:20px 0}
.notice{background:var(--soft);border-left:4px solid var(--gold);padding:12px 14px;font-size:15px}
.controls{max-width:960px;margin:18px auto;padding:0 18px}
.filters{display:flex;flex-wrap:wrap;gap:8px}
.filters button,.lineage-tabs button{background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:8px 14px}
.filters button.active,.lineage-tabs button.active{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.search{display:flex;gap:10px;align-items:center;margin-top:14px}
.search input{flex:1;min-width:0;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
.hint{color:var(--muted);font-size:14px}
.timeline-wrap{max-width:960px;margin:0 auto;padding:0 18px}
.timeline-wrap h2 span{font-size:14px;color:var(--muted);font-weight:400}
.timeline{display:flex;gap:10px;overflow-x:auto;padding:12px 4px 16px;cursor:grab;scrollbar-width:thin}
.timeline.dragging{cursor:grabbing}
.timeline button{flex:0 0 auto;background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:12px;padding:10px 12px;text-align:left;min-width:128px}
.timeline button b{display:block;font-size:17px}
.timeline button small{color:var(--muted)}
.timeline button.active{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent) inset}
main,.detail,footer{max-width:960px;margin:0 auto;padding:0 18px}
.section-head{display:flex;gap:16px;align-items:flex-start;margin:72px 0 24px;border-top:2px solid var(--ink);padding-top:18px}
.section-head .no{font-size:38px;color:var(--accent);line-height:1}
.section-head h2{margin:0;font-size:30px}
.section-head p{margin:2px 0 0;color:var(--muted)}
.overview-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.overview-grid article,.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px}
.era-art svg,.card-art svg{width:100%;height:150px;display:block;border-radius:10px}
.overview-grid h3,.card h3{margin:0 0 6px}
.overview-grid p,.card p{margin:6px 0}
.tag{display:inline-block;background:var(--soft);border-radius:999px;padding:2px 9px;font-size:13px;margin-right:6px}
.era{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:18px}
.era-head{display:flex;gap:14px}
.era-head .big{font-size:44px;color:var(--accent);line-height:1}
.era h3{margin:0;font-size:28px}
.era .period{color:var(--muted);margin:0}
.era dl{display:grid;grid-template-columns:110px 1fr;gap:8px 12px;margin:16px 0}
.era dt{font-weight:700}
.era dd{margin:0}
.video-slot{border:1px dashed var(--gold);border-radius:12px;padding:14px;background:var(--soft)}
.video-slot p{margin:6px 0}
.video-slot .slot-label{font-weight:700;color:var(--accent)}
.lineage-tabs{display:flex;gap:10px;margin-bottom:14px}
.lineage{border-left:3px solid var(--accent);margin-left:8px}
.lineage article{margin:0 0 12px 18px;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;position:relative}
.lineage article:before{content:"";position:absolute;left:-26px;top:20px;width:12px;height:12px;border-radius:50%;background:var(--accent)}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.card button{margin-top:10px;background:var(--ink);color:var(--bg);border:0;border-radius:999px;padding:8px 14px}
.detail{position:sticky;bottom:12px;background:var(--card);border:2px solid var(--accent);border-radius:16px;padding:18px;box-shadow:0 12px 30px rgba(0,0,0,.18);margin-top:30px}
.detail-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start}
.detail-head h2{margin:0;font-size:24px}
.detail-head button{background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:999px;padding:6px 12px;flex:0 0 auto}
.detail-illustration svg{width:100%;height:120px;display:block}
.detail dl{display:grid;grid-template-columns:90px 1fr;gap:8px 12px}
.detail dt{font-weight:700}
.detail dd{margin:0}
.detail-quote{border-left:4px solid var(--accent);padding-left:12px;font-style:italic}
footer{padding:30px 18px 50px;color:var(--muted);font-size:14px}
.hidden{display:none!important}
@media(max-width:640px){
  body{font-size:16px}
  h1{font-size:44px}
  .overview-grid,.cards{grid-template-columns:1fr}
  .era dl,.detail dl{grid-template-columns:1fr}
  .era dt,.detail dt{color:var(--accent)}
  .era-head .big{font-size:34px}
  .section-head h2{font-size:26px}
  .timeline button{min-width:112px}
}