:root{--ink:#152237;--muted:#667085;--line:#e4e9f0;--panel:#fff;--bg:#f3f6fa;--nav:#101d32;--blue:#2364aa;--cyan:#1fa2a6;--amber:#d98b19;--red:#c8323e;--green:#2c8b64;--shadow:0 8px 28px rgba(24,39,75,.08);font-family:"Segoe UI","Noto Sans TC",Arial,sans-serif;color:var(--ink);background:var(--bg)}*{box-sizing:border-box}body{margin:0;background:var(--bg)}button,select,input{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:248px 1fr}.sidebar{position:sticky;top:0;height:100vh;background:linear-gradient(180deg,#12223a,#0c1728);color:#fff;padding:24px 18px;display:flex;flex-direction:column;z-index:4}.brand{display:flex;align-items:center;gap:12px;padding:0 8px 24px;border-bottom:1px solid #ffffff1f}.brand-mark,.ai-orb{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:linear-gradient(135deg,#2d78cf,#22a7aa);font-weight:800}.brand strong{display:block;font-size:18px}.brand small,.source-status 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