:root{--bg: #f6f8fb;--surface: #ffffff;--surface-soft: #eef3f8;--border: #d9e1ec;--border-strong: #bac6d6;--text: #172033;--muted: #66738a;--accent: #0f766e;--accent-strong: #115e59;--indigo: #344b9f;--danger: #b42318;--shadow: 0 18px 48px rgba(22, 32, 51, .08);font-family:Inter,Microsoft YaHei,PingFang SC,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--bg)}button,input,textarea{font:inherit}button{border:0;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.58}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px}.login-panel{width:min(390px,100%);background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:34px;box-shadow:var(--shadow)}.brand-mark{width:48px;height:48px;display:grid;place-items:center;border-radius:8px;color:#fff;background:linear-gradient(135deg,var(--accent),var(--indigo))}.brand-mark.small{width:38px;height:38px;flex:0 0 auto}.login-panel h1{margin:22px 0 24px;font-size:30px;line-height:1.2;letter-spacing:0}.field{display:grid;gap:8px;color:var(--muted);font-size:14px;font-weight:700}.field input{height:46px;border:1px solid var(--border);border-radius:8px;padding:0 12px;outline:none;color:var(--text);background:#fff}.field input:focus,.composer textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #0f766e24}.primary-button,.ghost-button,.send-button,.upload-button,.icon-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:8px;font-weight:800}.primary-button{width:100%;min-height:44px;margin-top:18px;color:#fff;background:var(--accent)}.error-line,.error-banner{color:var(--danger);background:#fff1f0;border:1px solid #ffd5d2;border-radius:8px}.error-line{margin-top:12px;padding:10px 12px;font-size:14px}.agent-page{height:100vh;display:grid;grid-template-rows:auto 1fr auto;overflow:hidden;background:var(--bg)}.topbar{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:18px;padding:14px 22px;border-bottom:1px solid var(--border);background:#ffffffe6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.topbar-title,.topbar-actions{display:flex;align-items:center;gap:12px;min-width:0}.topbar-title h1{margin:0;font-size:20px;line-height:1.2;letter-spacing:0}.topbar-title span{display:block;margin-top:3px;color:var(--muted);font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:260px}.status-chip,.ghost-button,.icon-button{min-height:36px;color:var(--muted);background:#fff;border:1px solid var(--border);padding:0 11px;font-size:13px}.status-chip{display:inline-flex;align-items:center;justify-content:center;gap:7px;border-radius:8px;font-weight:800;white-space:nowrap}.status-chip.open{color:var(--accent-strong);border-color:#0f766e40;background:#ecfdf5}.status-chip.error{color:var(--danger);background:#fff1f0}.ghost-button:hover,.icon-button:hover,.upload-button:hover{border-color:var(--border-strong);background:var(--surface-soft)}.icon-button{width:36px;padding:0}.chat-panel{width:min(1040px,100%);min-width:0;margin:0 auto;overflow:auto;padding:24px 22px}.message{display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;margin-bottom:18px}.message-avatar{width:38px;height:38px;display:grid;place-items:center;color:#fff;background:var(--indigo);border-radius:8px;font-size:13px;font-weight:850}.message.user .message-avatar{background:var(--accent)}.message-body{min-width:0;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:14px 15px;box-shadow:0 8px 24px #1620330a}.message.user .message-body{background:#f8fffd;border-color:#0f766e33}.message-meta{display:flex;justify-content:space-between;gap:12px;margin-bottom:8px;color:var(--muted);font-size:12px;font-weight:850}.message-body pre{margin:0;white-space:pre-wrap;word-break:break-word;font-family:inherit;font-size:14px;line-height:1.72;color:var(--text)}.error-banner{padding:12px 14px;font-size:14px}.composer{border-top:1px solid var(--border);background:#fff;padding:14px 22px 18px}.composer-row{width:min(1040px,100%);display:grid;grid-template-columns:auto minmax(0,1fr) 50px;gap:12px;margin:0 auto}.upload-button{min-height:54px;padding:0 15px;color:var(--muted);background:var(--surface-soft);border:1px solid var(--border);font-size:14px}.upload-button input{display:none}.composer textarea{min-height:54px;max-height:190px;resize:vertical;border:1px solid var(--border);border-radius:8px;padding:14px;outline:none;color:var(--text);line-height:1.55}.send-button{width:50px;min-height:54px;color:#fff;background:var(--accent)}.file-strip{width:min(1040px,100%);display:flex;flex-wrap:wrap;gap:8px;margin:0 auto 10px}.file-chip{max-width:360px;display:inline-flex;align-items:center;gap:6px;overflow:hidden;color:var(--accent-strong);background:#ecfdf5;border:1px solid rgba(15,118,110,.25);border-radius:8px;padding:6px 9px;font-size:12px;font-weight:800}.file-chip svg{flex:0 0 auto}.file-name{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-chip small{flex:0 0 auto;color:var(--muted);font-size:11px;font-weight:800}.file-chip button{width:20px;height:20px;display:grid;place-items:center;flex:0 0 auto;padding:0;color:var(--accent-strong);background:transparent;border-radius:6px}.file-chip button:hover{background:#0f766e1f}.spin{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:820px){.agent-page{height:auto;min-height:100vh}.topbar{align-items:flex-start;flex-direction:column}.topbar-actions{width:100%;flex-wrap:wrap}.topbar-actions .ghost-button{flex:1 1 auto}.chat-panel{min-height:58vh;padding:18px 14px}.composer{padding:12px 14px 16px}.composer-row{grid-template-columns:106px minmax(0,1fr) 50px;gap:8px}.upload-button{padding:0 10px}.send-button{width:50px}}