:root{--ink:#1f2933;--muted:#5b6875;--line:#d6dce2;--surface:#fff;--page:#f4f6f8;--accent:#0b6e4f;--accent-soft:#e3f2ec;--danger:#b42318;--warning-bg:#fff6e0;--warning-line:#e0b252;--error-bg:#fdecea;color:var(--ink);background:var(--page);font-family:system-ui,-apple-system,Noto Sans TC,PingFang TC,Microsoft JhengHei,sans-serif;line-height:1.5}*{box-sizing:border-box}body{margin:0}.app{max-width:1040px;margin:0 auto;padding:16px}.app-header{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:8px;display:flex}h1{margin:0;font-size:1.5rem}h2{margin:0 0 8px;font-size:1.15rem}h3{margin:0;font-size:1rem}.save-state{color:var(--muted);margin:0;font-size:.875rem}.save-error,.save-conflict{color:var(--danger);font-weight:600}.tabs{border-bottom:1px solid var(--line);flex-wrap:wrap;gap:4px;margin:12px 0;display:flex}.tab{color:var(--muted);background:0 0;border:0;border-bottom:3px solid #0000;border-radius:0;padding:8px 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