:root{--bg: #070b14;--panel: rgba(14, 20, 36, .92);--panel-border: rgba(92, 184, 255, .16);--text: #e8eef8;--muted: #8b97b3;--accent: #4ce0c8;--accent-2: #4aa8ff;--danger: #ff6b7a;--ok: #5fe0a0;--warn: #f5c16c;--shadow: 0 24px 80px rgba(0, 0, 0, .35)}*{box-sizing:border-box}html,body,#app{margin:0;min-height:100%}body{font-family:Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;color:var(--text);background:radial-gradient(1200px 500px at 10% -10%,rgba(76,224,200,.12),transparent 50%),radial-gradient(900px 400px at 100% 0%,rgba(74,168,255,.14),transparent 46%),linear-gradient(180deg,#0a1222 0%,var(--bg) 40%)}button,input,textarea{font:inherit}.app-shell{display:grid;grid-template-columns:380px minmax(0,1fr);min-height:100vh}.kb-panel,.chat-panel{min-height:100vh}.kb-panel{border-right:1px solid var(--panel-border);background:var(--panel);padding:28px 22px 32px;display:flex;flex-direction:column;gap:22px;overflow:auto}.chat-panel{display:flex;flex-direction:column;padding:28px 32px 20px}.eyebrow{margin:0 0 6px;color:var(--accent);letter-spacing:.16em;font-size:11px;text-transform:uppercase}.panel-head h1,.chat-head h1{margin:0;font-size:28px;font-weight:650}.sub,.muted,.hint,.param-note{color:var(--muted)}.sub{margin:8px 0 0;line-height:1.5}.upload-box,.params,.selected-card,.placeholder-card{border:1px solid var(--panel-border);border-radius:16px;background:#ffffff05;box-shadow:var(--shadow)}.upload-box,.params,.selected-card{padding:16px}.hidden-input{display:none}.primary-btn,.composer button{width:100%;border:0;border-radius:12px;padding:12px 16px;color:#04110e;background:linear-gradient(135deg,var(--accent),#7ee7ff);font-weight:700;cursor:pointer}.primary-btn:disabled,.composer button:disabled{cursor:not-allowed;opacity:.55}.hint{margin:10px 0 0;font-size:12px}.params h2,.file-list h2,.selected-card h2,.placeholder-card h2{margin:0 0 12px;font-size:14px;letter-spacing:.04em}.params label{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-top:8px}.params input{width:108px;border:1px solid var(--panel-border);border-radius:10px;background:#070b14b3;color:var(--text);padding:8px 10px}.param-note{margin:6px 0 10px;font-size:12px;line-height:1.45}.list-head{display:flex;justify-content:space-between;align-items:baseline;color:var(--muted);font-size:12px}.file-list ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.file-item{border:1px solid var(--panel-border);border-radius:14px;padding:12px;cursor:pointer;background:#ffffff04;display:grid;grid-template-columns:1fr auto;gap:8px 12px}.file-item.active{border-color:#4ce0c88c;box-shadow:inset 0 0 0 1px #4ce0c833}.file-main strong{display:block;margin-bottom:6px;word-break:break-all}.meta,.file-side{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.meta{color:var(--muted);font-size:12px}.status{font-size:11px;border-radius:999px;padding:3px 8px;border:1px solid transparent}.status.waiting{color:var(--muted);border-color:#8b97b366}.status.processing{color:var(--accent-2);border-color:#4aa8ff73}.status.completed{color:var(--ok);border-color:#5fe0a073}.status.failed{color:var(--danger);border-color:#ff6b7a73}.ghost-btn{border:1px solid var(--panel-border);background:transparent;color:var(--muted);border-radius:8px;padding:4px 8px;cursor:pointer}.ghost-btn:hover{color:var(--danger);border-color:#ff6b7a80}.notice,.error,.empty,.item-error{font-size:13px;line-height:1.5}.notice{color:var(--accent)}.error,.item-error{color:var(--danger);margin:0;grid-column:1 / -1}.empty{color:var(--muted)}.selected-card p{margin:0 0 6px}.chat-head{margin-bottom:18px}.stage-banner{margin:12px 0 0;padding:10px 12px;border-radius:12px;background:#4aa8ff14;border:1px solid rgba(74,168,255,.2);color:#c8dcff}.transcript{flex:1;min-height:280px;overflow:auto}.placeholder-card{padding:28px;max-width:680px}.placeholder-card p{color:var(--muted);line-height:1.7}.composer{display:grid;grid-template-columns:minmax(0,1fr) 96px;gap:12px;align-items:end;margin-top:18px}.composer textarea{width:100%;resize:none;border-radius:14px;border:1px solid var(--panel-border);background:#0e1424e6;color:var(--text);padding:12px 14px}.composer textarea:disabled{opacity:.7}@media(max-width:900px){.app-shell{grid-template-columns:1fr}.kb-panel,.chat-panel{min-height:auto}}