:root{--color-bg: #f7f8fb;--color-card: #ffffff;--color-primary: #4c6ef5;--color-primary-dark: #3b5bdb;--color-text: #1f2430;--color-muted: #6b7280;--color-border: #e5e7eb;--color-danger: #e03131;--color-success: #2f9e44;--color-warning: #f08c00;font-family:PingFang SC,Microsoft YaHei,Helvetica Neue,Arial,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--color-bg);color:var(--color-text);line-height:1.6}a{color:var(--color-primary)}.app-shell{display:flex;flex-direction:column;min-height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:var(--color-card);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:10}.app-brand{font-size:18px;font-weight:700;color:var(--color-primary-dark);text-decoration:none}.app-nav{display:flex;gap:16px;align-items:center;flex-wrap:wrap}.app-nav a{color:var(--color-text);text-decoration:none;font-size:14px;padding:6px 10px;border-radius:6px}.app-nav a.active,.app-nav a:hover{background:#eef1ff;color:var(--color-primary-dark)}.app-main{flex:1;width:100%;max-width:960px;margin:0 auto;padding:24px 16px 64px}.card{background:var(--color-card);border:1px solid var(--color-border);border-radius:12px;padding:20px;margin-bottom:16px}.card h2{margin-top:0}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}@media (max-width: 640px){.grid-2{grid-template-columns:1fr}}.field{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}.field label{font-size:13px;color:var(--color-muted)}input,select,textarea{font-size:14px;padding:8px 10px;border:1px solid var(--color-border);border-radius:8px;font-family:inherit;background:#fff;color:var(--color-text)}textarea{resize:vertical}button{font-family:inherit}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:8px;border:1px solid var(--color-primary);background:var(--color-primary);color:#fff;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s ease}.btn:hover{background:var(--color-primary-dark)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-secondary{background:transparent;color:var(--color-primary-dark)}.btn-secondary:hover{background:#eef1ff}.btn-danger{background:var(--color-danger);border-color:var(--color-danger)}.btn-danger:hover{background:#c92a2a}.btn-row{display:flex;gap:8px;flex-wrap:wrap}.tag{display:inline-flex;align-items:center;padding:3px 10px;border-radius:999px;background:#eef1ff;color:var(--color-primary-dark);font-size:12px;margin:2px}.tag-pro{background:#fff3bf;color:#8f6a00}.alert{padding:12px 14px;border-radius:8px;font-size:14px;margin-bottom:14px}.alert-error{background:#fff5f5;color:var(--color-danger);border:1px solid #ffc9c9}.alert-info{background:#eef1ff;color:var(--color-primary-dark);border:1px solid #d0d9ff}.alert-warning{background:#fff9db;color:#8f6a00;border:1px solid #ffe066}.disclaimer{font-size:12px;color:var(--color-muted);border-top:1px dashed var(--color-border);padding-top:10px;margin-top:10px}.progress-bar{height:8px;background:#e9ecef;border-radius:999px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--color-primary)}.list-plain{list-style:none;padding:0;margin:0}.list-plain li{padding:8px 0;border-bottom:1px solid var(--color-border)}.list-plain li:last-child{border-bottom:none}.empty-state{text-align:center;padding:40px 16px;color:var(--color-muted)}.score-btn-group{display:flex;gap:6px}.score-btn{flex:1;padding:8px 4px;border-radius:8px;border:1px solid var(--color-border);background:#fff;cursor:pointer;font-size:13px;text-align:center}.score-btn.selected{border-color:var(--color-primary);background:var(--color-primary);color:#fff}.citation-card{border:1px solid var(--color-border);border-radius:8px;padding:10px 12px;margin-top:8px;font-size:13px;background:#fafbff}.citation-quote{font-style:italic;color:var(--color-muted);border-left:3px solid var(--color-primary);padding-left:8px;margin:6px 0}.qa-message{padding:10px 0}.qa-message.user{text-align:right}.qa-bubble{display:inline-block;max-width:100%;padding:10px 14px;border-radius:12px;white-space:pre-wrap;text-align:left}.qa-bubble.user{background:var(--color-primary);color:#fff}.qa-bubble.assistant{background:#fff;border:1px solid var(--color-border)}.spinner{display:inline-block;width:14px;height:14px;border:2px solid #d0d9ff;border-top-color:var(--color-primary);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}