:root{--bg:#0b1220;--bg-elev:#131c2e;--bg-card:#1a2541;--border:#243352;--text:#e6edf7;--text-dim:#94a3b8;--primary:#3b82f6;--primary-dim:#1e40af;--success:#10b981;--warn:#f59e0b;--danger:#ef4444;--max-width:480px}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,system-ui,sans-serif;font-size:16px;line-height:1.5;-webkit-tap-highlight-color:transparent;overscroll-behavior-y:none}body{min-height:100dvh}a{text-decoration:none}a,button{color:inherit}button{background:none;border:none;padding:0;cursor:pointer}button,input,textarea{font:inherit}.app-shell{max-width:var(--max-width);margin:0 auto;min-height:100dvh;display:flex;flex-direction:column;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}.app-main{flex:1 1;padding:12px 16px 80px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--border);background:var(--bg-elev);position:-webkit-sticky;position:sticky;top:0;z-index:10}.topbar h1{font-size:16px;font-weight:600;margin:0}.topbar .sub,.trip-bar{font-size:12px;color:var(--text-dim)}.trip-bar{display:inline-flex;align-items:center;gap:6px;background:none;border:none;padding:2px 0;cursor:pointer}.trip-edit-hint{font-size:11px;color:var(--primary,#6ea8fe);border:1px solid var(--border);border-radius:8px;padding:0 6px;line-height:16px}.trip-edit{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.trip-input{width:80px;font-size:12px;padding:3px 6px;background:var(--bg-card);border:1px solid var(--border);border-radius:6px;color:inherit}.trip-arrow{font-size:12px;color:var(--text-dim)}.loc-bar{display:flex;align-items:center;gap:8px;padding:4px 8px;border-top:1px solid var(--border);background:var(--bg-elev);flex-wrap:wrap}.btn.small{font-size:11px;padding:2px 8px;border-radius:4px}.bottom-nav{position:fixed;bottom:0;left:0;right:0;max-width:var(--max-width);margin:0 auto;display:flex;border-top:1px solid var(--border);background:var(--bg-elev);padding-bottom:env(safe-area-inset-bottom);z-index:20}.bottom-nav a{flex:1 1;text-align:center;padding:10px 0;font-size:12px;color:var(--text-dim)}.bottom-nav a.active{color:var(--primary)}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:12px;margin-bottom:10px}.card h3{margin:0 0 8px;font-size:14px;font-weight:600;display:flex;justify-content:space-between;align-items:center}.card .meta{font-size:12px;color:var(--text-dim)}.row{display:flex;gap:8px;align-items:center}.row.between{justify-content:space-between}.col{display:flex;flex-direction:column;gap:8px}.btn{padding:10px 14px;border-radius:10px;background:var(--primary);color:#fff;font-weight:500;font-size:14px;border:1px solid transparent;transition:opacity .15s}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.secondary{background:var(--bg-card);border-color:var(--border)}.btn.danger{background:var(--danger)}.chip{display:inline-block;padding:2px 8px;border-radius:999px;font-size:11px;background:var(--bg-elev);border:1px solid var(--border);color:var(--text-dim)}.chip.green{background:rgba(16,185,129,.15);color:var(--success);border-color:rgba(16,185,129,.4)}.chip.yellow{background:rgba(245,158,11,.15);color:var(--warn);border-color:rgba(245,158,11,.4)}.chip.red{background:rgba(239,68,68,.15);color:var(--danger);border-color:rgba(239,68,68,.4)}.chat-list{display:flex;flex-direction:column;gap:10px;margin-bottom:12px}.msg{max-width:85%;padding:10px 12px;border-radius:14px;font-size:14px;white-space:pre-wrap;word-break:break-word}.msg.user{align-self:flex-end;background:var(--primary);color:#fff;border-bottom-right-radius:4px}.msg.ai{background:var(--bg-card);border:1px solid var(--border);border-bottom-left-radius:4px}.msg.ai,.msg.tool{align-self:flex-start}.msg.tool{font-size:11px;color:var(--text-dim);background:transparent;border:1px dashed var(--border);padding:6px 8px}.chat-input{display:flex;gap:8px;align-items:flex-end;position:-webkit-sticky;position:sticky;bottom:56px;background:var(--bg);padding:8px 0}.chat-input textarea{flex:1 1;resize:none;min-height:44px;max-height:120px;padding:10px 12px;border-radius:12px;background:var(--bg-card);border:1px solid var(--border);color:var(--text)}.chat-input button{height:44px;padding:0 16px}.status-line{font-size:12px;margin:4px 0}.empty,.status-line{color:var(--text-dim)}.empty{text-align:center;padding:40px 0;font-size:13px}.seg-bar{display:flex;gap:8px;padding:8px 0;position:-webkit-sticky;position:sticky;top:0;background:var(--bg);z-index:5}.card-actions{display:flex;gap:8px;margin-top:8px}.plan-candidates{align-self:flex-start;display:flex;flex-direction:column;gap:4px;margin:2px 0 8px;max-width:100%}.plan-candidate-row{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:6px 10px;border:1px solid var(--border);border-radius:10px;background:var(--bg-card);font-size:13px}