:root{--bg: #0f1419;--panel: #171e27;--text: #e6edf3;--muted: #8b949e;--accent: #238636;--border: #30363d;font-family:system-ui,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}a{color:#58a6ff}.container{max-width:1100px;margin:0 auto;padding:1rem 1.25rem 2rem}.layout{min-height:100vh}.topbar{display:flex;justify-content:space-between;align-items:center;padding:.75rem 1.25rem;border-bottom:1px solid var(--border)}.logo{font-weight:700;color:var(--text);text-decoration:none}.link-btn{background:none;border:none;color:#58a6ff;cursor:pointer}.auth-card{max-width:420px;margin:3rem auto;padding:2rem;background:var(--panel);border:1px solid var(--border);border-radius:12px}.auth-card form{display:grid;gap:1rem}label{display:grid;gap:.35rem;font-size:.9rem}input,textarea,button{font:inherit}input,textarea{padding:.6rem .75rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text)}button{padding:.65rem 1rem;border:none;border-radius:8px;background:var(--accent);color:#fff;cursor:pointer}.error{color:#f85149}.muted{color:var(--muted)}.dashboard .grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}@media(max-width:800px){.dashboard .grid{grid-template-columns:1fr}}.panel{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:1rem}.panel.full{grid-column:1 / -1}.stack{display:grid;gap:.5rem;margin-bottom:1rem}.file-label input{margin-top:.5rem}.doc-list{margin:1rem 0 0;padding-left:1.2rem;color:var(--muted);font-size:.9rem}.chat-log{min-height:180px;max-height:280px;overflow:auto;border:1px solid var(--border);border-radius:8px;padding:.5rem;margin-bottom:.5rem}.chat-msg{margin:.35rem 0;padding:.5rem .65rem;border-radius:8px;font-size:.95rem}.chat-msg.user{background:#388bfd26}.chat-msg.bot{background:#ffffff0d}.chat-form{display:flex;gap:.5rem}.chat-form input{flex:1}.snippet{background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:1rem;overflow:auto;font-size:.85rem}