:root{--primary:#4f46e5;--primary-light:#6366f1;--primary-bg:#eef2ff;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--text:#1f2937;--text-secondary:#6b7280;--border:#e5e7eb;--bg:#f9fafb;--card-bg:#ffffff;--radius:12px;--shadow:0 1px 3px rgba(0,0,0,0.1),0 1px 2px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}.container{max-width:800px;margin:0 auto;padding:16px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 24px;border-radius:8px;font-size:15px;font-weight:500;border:none;cursor:pointer;transition:.2s;gap:8px;text-decoration:none}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover{background:var(--primary-light)}.btn-secondary{background:var(--border);color:var(--text)}.btn-secondary:hover{background:#d1d5db}.btn-danger{background:var(--danger);color:#fff}.btn-success{background:var(--success);color:#fff}.btn-sm{padding:6px 14px;font-size:13px}.btn-block{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed}.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:16px}.input-group{margin-bottom:16px}.input-group label{display:block;font-size:14px;font-weight:500;color:var(--text);margin-bottom:6px}.input-group input,.input-group select,.input-group textarea{width:100%;padding:10px 14px;border:1.5px solid var(--border);border-radius:8px;font-size:15px;outline:0;transition:border .2s;background:#fff;color:var(--text)}.input-group input:focus,.input-group select:focus,.input-group textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-bg)}.input-group textarea{resize:vertical;min-height:80px}.badge{display:inline-block;padding:2px 10px;border-radius:20px;font-size:12px;font-weight:500}.badge-primary{background:var(--primary-bg);color:var(--primary)}.badge-success{background:#d1fae5;color:#065f46}.badge-warning{background:#fef3c7;color:#92400e}.badge-danger{background:#fee2e2;color:#991b1b}.badge-secondary{background:#f3f4f6;color:#6b7280}.navbar{background:var(--card-bg);box-shadow:var(--shadow);padding:0 16px;position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;height:56px}.navbar-brand{font-size:18px;font-weight:700;color:var(--primary);text-decoration:none}.navbar-actions{display:flex;align-items:center;gap:12px}.navbar-user{font-size:14px;color:var(--text-secondary);cursor:pointer}.auth-page{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,#667eea 0,#764ba2 100%)}.auth-card{background:#fff;border-radius:16px;padding:40px 32px;width:100%;max-width:400px;box-shadow:var(--shadow-lg)}.auth-card h1{font-size:24px;text-align:center;margin-bottom:8px;color:var(--text)}.auth-card .subtitle{text-align:center;color:var(--text-secondary);margin-bottom:32px;font-size:14px}.auth-card .link{text-align:center;margin-top:16px;font-size:14px;color:var(--text-secondary)}.auth-card .link a{color:var(--primary);text-decoration:none;font-weight:500}.course-grid{display:grid;gap:16px;grid-template-columns:1fr}.course-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;cursor:pointer;transition:transform .2s,box-shadow .2s;text-decoration:none;color:inherit;display:block}.course-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.course-card-cover{height:160px;background:linear-gradient(135deg,#667eea,#764ba2);display:flex;align-items:center;justify-content:center;font-size:48px}.course-card-body{padding:16px}.course-card-body h3{font-size:16px;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-card-body .meta{font-size:12px;color:var(--text-secondary);display:flex;gap:12px;margin-top:8px}.course-card-body .meta span{display:flex;align-items:center;gap:4px}.course-info-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);margin:16px;overflow:hidden}.course-info-header{background:linear-gradient(135deg,#1e1b4b,#312e81);color:#fff;padding:28px 20px}.course-info-header h1{font-size:22px;line-height:1.4}.course-info-meta{font-size:13px;opacity:.8;margin-top:10px;display:flex;align-items:center;gap:16px;flex-wrap:wrap}.course-info-body{padding:20px}.course-info-body h3{font-size:15px;color:var(--text);margin-bottom:8px}.course-info-body .desc{font-size:14px;color:var(--text-secondary);line-height:1.8}.toolbar{display:flex;gap:10px;margin-bottom:16px;flex-wrap:wrap}.toolbar input,.toolbar select{padding:8px 12px;border:1.5px solid var(--border);border-radius:8px;font-size:14px;outline:0;background:#fff}.toolbar input{flex:1;min-width:150px}.toolbar input:focus,.toolbar select:focus{border-color:var(--primary)}.table-wrap{overflow-x:auto}table{width:100%;border-collapse:collapse;font-size:14px}table td,table th{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border)}table th{background:var(--bg);font-weight:600;color:var(--text-secondary);font-size:13px}table tr:hover td{background:var(--primary-bg)}.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.5);display:flex;align-items:center;justify-content:center;z-index:200;padding:20px}.modal{background:#fff;border-radius:16px;padding:28px 24px;width:100%;max-width:500px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-lg)}.modal h2{font-size:20px;margin-bottom:20px}.modal-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:20px}.toast{position:fixed;top:16px;left:50%;transform:translateX(-50%);padding:12px 24px;border-radius:8px;color:#fff;font-size:14px;z-index:300;animation:.3s slideDown;box-shadow:var(--shadow-lg)}.toast-success{background:var(--success)}.toast-error{background:var(--danger)}.toast-info{background:var(--primary)}@keyframes slideDown{from{transform:translateX(-50%) translateY(-100%);opacity:0}to{transform:translateX(-50%) translateY(0);opacity:1}}.empty{text-align:center;padding:60px 20px;color:var(--text-secondary)}.empty-icon{font-size:56px;margin-bottom:16px}.empty h3{font-size:18px;margin-bottom:8px;color:var(--text)}.stats-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:20px}@media (min-width:600px){.course-grid{grid-template-columns:repeat(2,1fr)}.stats-grid{grid-template-columns:repeat(3,1fr)}}@media (min-width:900px){.stats-grid{grid-template-columns:repeat(5,1fr)}}.stat-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;text-align:center}.stat-card .num{font-size:28px;font-weight:700;color:var(--primary)}.stat-card .label{font-size:13px;color:var(--text-secondary);margin-top:4px}.stat-card .sub{font-size:11px;color:var(--text-secondary);margin-top:2px}.funnel-section{margin-bottom:20px}.funnel-section h2{margin-bottom:16px;font-size:18px}.funnel-wrap{display:flex;flex-direction:column;align-items:center;gap:0}.funnel-step{position:relative;width:100%;max-width:520px;text-align:center;padding:18px 24px;color:#fff;font-weight:600;transition:transform .2s}.funnel-step:hover{transform:scale(1.02)}.funnel-step-1{background:linear-gradient(135deg,#3b82f6,#1d4ed8);border-radius:12px 12px 0 0;width:100%}.funnel-step-2{background:linear-gradient(135deg,#6366f1,#4f46e5);width:82%;border-radius:12px;margin-top:-4px}.funnel-step-3{background:linear-gradient(135deg,#8b5cf6,#7c3aed);width:64%;border-radius:12px;margin-top:-4px}.funnel-step-4{background:linear-gradient(135deg,#10b981,#059669);width:46%;border-radius:12px;margin-top:-4px}.funnel-step-5{background:linear-gradient(135deg,#f59e0b,#d97706);width:28%;border-radius:0 0 12px 12px;margin-top:-4px}.funnel-icon{font-size:22px;margin-bottom:4px}.funnel-val{font-size:26px;font-weight:700}.funnel-label{font-size:13px;opacity:.9;margin-top:2px}.funnel-rate{font-size:12px;opacity:.75;margin-top:2px}.funnel-arrow{width:0;height:0;border-left:16px solid transparent;border-right:16px solid transparent;border-top:14px solid rgba(255,255,255,.15);position:relative;z-index:1}.funnel-legend{display:flex;gap:12px;flex-wrap:wrap;margin-top:16px;justify-content:center;font-size:12px;color:var(--text-secondary)}.funnel-legend-item{display:flex;align-items:center;gap:6px}.funnel-legend-dot{width:10px;height:10px;border-radius:50%}.funnel-dot-1{background:#3b82f6}.funnel-dot-2{background:#6366f1}.funnel-dot-3{background:#8b5cf6}.funnel-dot-4{background:#10b981}.funnel-dot-5{background:#f59e0b}.page-rank{margin-top:16px}.page-rank-item{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;border-radius:6px;margin-bottom:4px;background:var(--bg);font-size:13px}.page-rank-item .path{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text)}.page-rank-item .cnt{font-weight:600;color:var(--primary);margin-left:12px;min-width:40px;text-align:right}.tabs{display:flex;gap:0;border-bottom:2px solid var(--border);margin-bottom:20px}.tab{padding:10px 20px;font-size:14px;font-weight:500;color:var(--text-secondary);cursor:pointer;border:none;background:0 0;border-bottom:2px solid transparent;margin-bottom:-2px;transition:.2s}.tab.active{color:var(--primary);border-bottom-color:var(--primary)}.tab:hover{color:var(--text)}.reg-form-card{background:linear-gradient(135deg,#eef2ff,#e0e7ff);border:2px dashed var(--primary-light);border-radius:var(--radius);padding:24px;text-align:center;margin:16px}.reg-form-card h3{margin-bottom:8px;color:var(--primary)}.reg-form-card p{font-size:14px;color:var(--text-secondary);margin-bottom:16px}@media (max-width:480px){.auth-card{padding:28px 20px}.course-info-header h1{font-size:18px}.modal{padding:20px 16px}table{font-size:12px}table td,table th{padding:8px 10px}}