:root{color-scheme:light;--bg: #f5f7f4;--ink: #1f2933;--muted: #607080;--line: #d8dfdc;--panel: #ffffff;--green: #147a54;--green-soft: #dff4ea;--red: #b42318;--red-soft: #fde8e5;--blue: #2454a6;--blue-soft: #e5efff;--amber: #8a5b00;--amber-soft: #fff3d6;--shadow: 0 18px 50px rgba(31, 41, 51, .1)}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--ink);background:var(--bg);font-family:Microsoft YaHei,PingFang SC,system-ui,sans-serif}button,input,select,.link-button{min-height:42px;border-radius:8px;font:inherit}input,select{width:100%;min-width:0;border:1px solid var(--line);padding:0 12px;color:var(--ink);background:#fff}button{border:0;padding:0 16px;color:#fff;background:var(--blue);cursor:pointer;font-weight:700;white-space:nowrap}.link-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 16px;color:#fff;background:var(--blue);text-decoration:none;font-weight:700;white-space:nowrap}.link-button img{width:22px;height:22px;object-fit:contain}.gpt-link img{width:33px;height:33px;filter:invert(1)}.gpt-link{min-height:63px;padding:0 24px;font-size:1.5em;gap:12px}button:disabled{cursor:not-allowed;opacity:.45}h1,h2,h3,p{margin:0;letter-spacing:0}h1{margin-top:4px;font-size:clamp(34px,5vw,56px);line-height:1.02}h2{font-size:26px}h3{font-size:20px}.auth-view{min-height:100vh;display:grid;place-items:center;padding:24px}.auth-card,.panel,.account-card,.user-card{background:#fffffff0;border:1px solid rgba(216,223,220,.95);border-radius:8px;box-shadow:var(--shadow)}.auth-card{width:min(420px,100%);padding:28px}.auth-tabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:22px 0 16px}.auth-tabs button,.page-tabs button,.filters button,.text-button,.notify-button{color:var(--blue);background:var(--blue-soft)}.auth-tabs button.active,.page-tabs button.active,.filters button.active{color:#fff;background:var(--blue)}.stack{display:grid;gap:10px}.notice{margin:0 0 12px;padding:10px 12px;border-radius:8px;border:1px solid var(--line);line-height:1.5;font-size:14px;outline:none}.notice.error{color:var(--red);border-color:#b4231859;background:var(--red-soft)}.notice.info{color:var(--blue);border-color:#2454a647;background:var(--blue-soft)}.hint,.eyebrow,.section-title p,.empty-text,.history-list span,.chat-message span,.account-card-head span{color:var(--muted);font-size:14px;line-height:1.5}.hint{margin-top:12px}.workspace{width:min(1280px,calc(100% - 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