:root{--bg: #ffffff;--bg-soft: #fafafb;--ink: #3b3f46;--muted: #8a8f98;--line: #e6e8ec;--card-shadow: 0 1px 4px rgba(0, 0, 0, .12);--radius: 10px;font-family:system-ui,-apple-system,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;color:var(--ink)}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg-soft)}.state{display:grid;place-items:center;height:100%;color:var(--muted)}.app{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:baseline;gap:14px;padding:12px 20px;background:#fff;border-bottom:1px solid var(--line);flex:0 0 auto}.brand{font-weight:700;font-size:16px}.topbar .sub{color:var(--muted);font-size:13px}.cols{display:flex;flex:1 1 auto;min-height:0}.col{min-height:0;overflow:auto}.col-timeline{flex:1 1 auto}.col-chat{flex:0 0 420px;border-left:1px solid var(--line);background:var(--bg-soft)}.col-file{flex:0 0 480px;border-left:1px solid var(--line);background:#fff}.timeline{position:relative;max-width:920px;margin:0 auto;padding:28px 16px 60px}.timeline-line{position:absolute;top:0;bottom:0;left:50%;width:2px;background:var(--line);transform:translate(-1px)}.tl-row{position:relative;display:grid;grid-template-columns:1fr 40px 1fr;align-items:center;margin:18px 0}.tl-node{display:grid;place-items:center}.node-icon{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;box-shadow:0 0 0 4px #fff;z-index:1}.tl-cell{padding:0 18px}.tl-left{display:flex;justify-content:flex-end}.card{width:100%;max-width:360px;background:#fff;border:1px solid transparent;border-radius:var(--radius);box-shadow:var(--card-shadow);overflow:hidden;transition:box-shadow .15s ease,transform .15s ease}.card.active{box-shadow:0 4px 14px #00000029}.card-head{display:flex;align-items:baseline;gap:8px;padding:12px 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var(--line);font-weight:600;font-size:14px;background:#fff;position:sticky;top:0}.panel-head .x{border:none;background:transparent;font-size:20px;line-height:1;color:var(--muted);cursor:pointer}.panel-body{padding:14px 16px;overflow:auto}.ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:380px}.seg{margin-bottom:16px}.seg-label{text-transform:uppercase;letter-spacing:.06em;font-size:11px;font-weight:700;color:var(--muted);margin-bottom:6px}.seg-user .seg-content{background:#fff;border:1px solid var(--line);border-left:3px solid #7e8cd0;border-radius:8px;padding:10px 12px;font-size:14px;line-height:1.5}.seg-assistant .seg-content.scroll{max-height:46vh;overflow:auto;background:#fff;border:1px solid var(--line);border-radius:8px;padding:4px 14px}.muted{color:var(--muted)}.file-list{display:flex;flex-wrap:wrap;gap:8px}.file-chip{display:inline-flex;align-items:center;gap:8px;padding:7px 10px;background:#fff;border:1px solid var(--line);border-radius:8px;cursor:pointer;font-size:13px;max-width:100%}.file-chip:hover{border-color:#c7ccd4}.file-chip.active{border-color:#7e8cd0;box-shadow:0 0 0 2px #7e8cd02e}.file-kind{font-size:10px;text-transform:uppercase;letter-spacing:.05em;color:#fff;background:#aab0ba;border-radius:4px;padding:2px 5px}.file-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:260px}.preview{height:100%}.html-frame{width:100%;height:100%;min-height:70vh;border:1px solid var(--line);border-radius:8px;background:#fff}.img-preview{max-width:100%;border-radius:8px}.text-preview{white-space:pre-wrap;word-break:break-word;font-size:13px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:12px}.md{font-size:14px;line-height:1.62}.md h1{font-size:19px}.md h2{font-size:16px}.md h3{font-size:14.5px}.md h1,.md h2,.md h3,.md h4{margin:14px 0 8px;line-height:1.3}.md p{margin:8px 0}.md ul,.md ol{margin:8px 0;padding-left:22px}.md li{margin:3px 0}.md 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