:root{--primary:#2563eb;--primary-dark:#1d4ed8;--danger:#dc2626;--warning:#f59e0b;--success:#16a34a;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-500:#6b7280;--gray-700:#374151;--gray-900:#111827;--sidebar-w:220px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--gray-50);color:var(--gray-900);line-height:1.6}.app-shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);background:var(--gray-900);color:#fff;padding:20px 0;flex-shrink:0;position:fixed;top:0;left:0;bottom:0;overflow-y:auto}.sidebar .logo{padding:0 20px 20px;font-size:15px;font-weight:700;border-bottom:1px solid var(--gray-700);margin-bottom:12px}.sidebar .logo small{display:block;font-weight:400;font-size:11px;color:var(--gray-500);margin-top:2px}.sidebar nav a{display:block;padding:10px 20px;color:var(--gray-300);text-decoration:none;font-size:14px;transition:background .15s}.sidebar nav a.active,.sidebar nav a:hover{background:var(--gray-700);color:#fff}.sidebar .user-info{position:absolute;bottom:0;left:0;right:0;padding:12px 20px;border-top:1px solid var(--gray-700);font-size:12px;color:var(--gray-500)}.sidebar .user-info strong{color:var(--gray-300)}.sidebar .logout-btn{background:none;border:none;color:var(--danger);cursor:pointer;font-size:12px;margin-top:4px}.main-content{margin-left:var(--sidebar-w);flex:1 1;padding:24px 32px;min-width:0}.page-header{margin-bottom:24px}.page-header h1{font-size:22px;font-weight:700}.page-header p{color:var(--gray-500);font-size:14px;margin-top:4px}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));grid-gap:16px;gap:16px;margin-bottom:24px}.card{background:#fff;border-radius:8px;padding:20px;border:1px solid var(--gray-200)}.card 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var(--gray-200);padding:16px}.message-item{padding:10px 0;border-bottom:1px solid var(--gray-100)}.message-item:last-child{border-bottom:none}.msg-header{display:flex;gap:8px;align-items:center;margin-bottom:4px}.msg-sender{font-weight:600;font-size:13px}.msg-time{font-size:11px;color:var(--gray-500)}.msg-type-badge{font-size:10px;background:var(--gray-100);padding:1px 6px;border-radius:4px;color:var(--gray-500)}.msg-content{font-size:14px;color:var(--gray-700);white-space:pre-wrap}.score-bar{display:flex;align-items:center;gap:8px}.score-bar-track{flex:1 1;height:8px;background:var(--gray-200);border-radius:4px;overflow:hidden}.score-bar-fill{height:100%;border-radius:4px;transition:width .3s}.score-num{font-size:13px;font-weight:600;min-width:36px;text-align:right}.tabs{display:flex;gap:4px;margin-bottom:20px;border-bottom:2px solid var(--gray-200)}.tab-btn{padding:8px 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