:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--primary-border: #c7d2fe;--primary-glow: rgba(79, 70, 229, .12);--primary-grad: linear-gradient(135deg, #4f46e5, #7c3aed);--success: #059669;--success-bg: #ecfdf5;--success-border: #a7f3d0;--warning: #d97706;--warning-bg: #fffbeb;--warning-border: #fde68a;--danger: #dc2626;--danger-bg: #fef2f2;--danger-border: #fecaca;--bg: #f5f3ff;--surface: #ffffff;--surface-raised: #ffffff;--text-1: #1e1b4b;--text-2: #4b5563;--text-3: #9ca3af;--border: #e5e7eb;--border-lt: #f3f4f6;--focus: #818cf8;--r-sm: 8px;--r-md: 12px;--r-lg: 16px;--r-xl: 20px;--r-full: 9999px;--s-1: 4px;--s-2: 8px;--s-3: 12px;--s-4: 16px;--s-5: 20px;--s-6: 24px;--s-8: 32px;--s-10: 40px;--s-12: 48px;--sh-sm: 0 1px 2px rgba(0,0,0,.05);--sh-xs: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);--sh-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);--sh-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.05);--sh-xl: 0 20px 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h3{font-size:var(--fs-md);font-weight:700;color:var(--text-1);display:flex;align-items:center;gap:6px;margin:0}.result-progress-badge{font-size:var(--fs-xs);font-weight:600;color:var(--success);background:var(--success-bg);border:1px solid var(--success-border);padding:3px 10px;border-radius:var(--r-full)}.result-progress-summary{font-size:var(--fs-sm);color:var(--text-2)}.result-progress-summary strong{color:var(--success);font-size:var(--fs-md)}.result-progress-bar{height:8px;background:var(--border-lt);border-radius:var(--r-full);overflow:hidden}.result-progress-bar .progress-fill{height:100%;background:var(--success);border-radius:var(--r-full);transition:width .6s ease}.result-chapter-progress{display:grid;gap:10px}.result-ch-item{display:grid;gap:4px}.result-ch-top{display:flex;justify-content:space-between;align-items:baseline;font-size:var(--fs-sm);color:var(--text-1)}.result-ch-top small{color:var(--text-3);font-weight:400}.profile-hero{display:flex;flex-direction:column;align-items:center;gap:8px;padding:28px 0 20px}.profile-avatar{width:72px;height:72px;border-radius:50%;background:var(--primary-grad);display:flex;align-items:center;justify-content:center;color:#fff;margin-bottom:6px;box-shadow:0 4px 14px #4f46e540}.profile-name{font-size:var(--fs-xl);font-weight:700;margin:0;color:var(--text-1)}.profile-role{font-size:var(--fs-xs);font-weight:600;text-transform:uppercase;letter-spacing:.5px;color:var(--primary);background:var(--primary-light);padding:3px 12px;border-radius:var(--r-full)}.profile-stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:12px}.profile-stat{background:#f9fafb;border-radius:var(--r-md);padding:14px;text-align:center;border:1px solid var(--border-lt)}.profile-stat strong{display:block;font-size:var(--fs-2xl);font-weight:700;color:var(--text-1)}.profile-stat span{font-size:var(--fs-xs);color:var(--text-3)}.profile-info{display:grid;gap:0}.profile-row{display:flex;justify-content:space-between;align-items:center;padding:13px 0;border-bottom:1px solid var(--border-lt);font-size:var(--fs-base)}.profile-row:last-child{border-bottom:none}.profile-row span:first-child{color:var(--text-3)}.logout-btn{width:100%;background:var(--danger-bg);color:var(--danger);border-color:var(--danger-border);margin-top:8px;font-weight:500}.logout-btn:hover{background:#fee2e2}.bank-layout{display:flex;min-height:100vh;background:var(--bg)}.bank-sidebar{background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;height:100vh;position:sticky;top:0;width:280px;flex-shrink:0;transition:width .25s ease,opacity .2s ease}.bank-sidebar.collapsed{width:0;overflow:hidden;border-right:none;opacity:0;pointer-events:none}.bank-sidebar-header{padding:14px 14px 10px;border-bottom:1px solid var(--border-lt);display:grid;gap:8px}.bank-sidebar-top{display:flex;justify-content:space-between;align-items:center}.bank-collapse-btn,.bank-expand-btn{width:32px;height:32px;padding:0;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--surface);color:var(--text-3);font-size:15px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.bank-collapse-btn:hover,.bank-expand-btn:hover{background:#f9fafb;color:var(--text-1);border-color:#d1d5db}.bank-expand-btn{margin-bottom:12px}.bank-sidebar-header h2{font-size:var(--fs-lg);font-weight:700;margin:0;color:var(--text-1)}.bank-chapter-select{font-size:var(--fs-sm);padding:8px 28px 8px 10px;border:1.5px solid var(--border);border-radius:var(--r-sm)}.bank-stats{display:flex;gap:8px;flex-wrap:wrap}.bank-stat{font-size:var(--fs-xs);font-weight:600;padding:3px 8px;border-radius:var(--r-full);cursor:pointer;border:1.5px solid transparent;transition:var(--tr)}.bank-stat:hover{opacity:.8;transform:scale(1.05)}.bank-stat.active{border-color:currentColor;box-shadow:0 0 0 2px #0000000f}.stat-correct{color:var(--success);background:var(--success-bg)}.stat-correct.active{background:#d1fae5}.stat-wrong{color:var(--danger);background:var(--danger-bg)}.stat-wrong.active{background:#fee2e2}.stat-unanswered{color:var(--text-3);background:#f3f4f6}.stat-unanswered.active{background:#e5e7eb}.bank-list{flex:1;overflow-y:auto;padding:8px;display:grid;gap:3px;align-content:start}.bank-loading,.bank-empty{text-align:center;padding:24px 12px;color:var(--text-3);font-size:var(--fs-sm)}.bank-q-item{display:flex;align-items:center;gap:8px;padding:8px 10px;border:1px solid transparent;border-radius:var(--r-sm);background:transparent;font-size:var(--fs-sm);cursor:pointer;transition:var(--tr);width:100%;text-align:left;min-height:36px}.bank-q-item:hover{background:#f9fafb}.bank-q-item.active{background:var(--primary-light);border-color:var(--primary-border)}.bank-q-num{width:28px;text-align:center;font-weight:600;font-size:var(--fs-xs);color:var(--text-2);flex-shrink:0}.bank-q-icon{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;flex-shrink:0;border:1.5px solid var(--border)}.bank-q-icon.correct{color:var(--success);background:var(--success-bg);border-color:var(--success-border)}.bank-q-icon.wrong{color:var(--danger);background:var(--danger-bg);border-color:var(--danger-border)}.bank-q-icon.unanswered{color:var(--text-3)}.bank-content{flex:1;min-width:0;padding:16px 20px;overflow:hidden;height:100vh;display:flex;flex-direction:column}.bank-no-question{display:flex;align-items:center;justify-content:center;height:60vh;color:var(--text-3);font-size:var(--fs-md)}.bank-question-view{max-width:640px;width:100%;flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch}.bank-q-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.bank-q-progress{font-size:var(--fs-sm);color:var(--text-3);font-weight:500}.bank-q-status-badge{font-size:var(--fs-xs);font-weight:600;padding:3px 10px;border-radius:var(--r-full)}.bank-q-status-badge.correct{color:var(--success);background:var(--success-bg);border:1px solid var(--success-border)}.bank-q-status-badge.wrong{color:var(--danger);background:var(--danger-bg);border:1px solid var(--danger-border)}.bank-q-status-badge.unanswered{color:var(--text-3);background:#f3f4f6;border:1px solid var(--border-lt)}.bank-actions{margin-top:12px;display:grid;grid-template-columns:1fr 1fr;gap:10px}.bank-actions button{padding:12px;font-size:var(--fs-md)}.bank-result{display:grid;gap:12px;margin-top:12px}.bank-result-header{padding:12px 16px;border-radius:var(--r-md);font-weight:600;font-size:var(--fs-md)}.bank-result-header.correct{background:var(--success-bg);color:var(--success);border:1px solid var(--success-border)}.bank-result-header.wrong{background:var(--danger-bg);color:var(--danger);border:1px solid var(--danger-border)}.bank-nav{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:4px;flex-shrink:0;background:var(--bg);padding:12px 0;padding-bottom:calc(12px + env(safe-area-inset-bottom));border-top:1px solid var(--border);box-shadow:0 -2px 10px #0000000a}.bank-nav button{padding:12px;font-size:var(--fs-md)}.md-content{font-size:var(--fs-base);line-height:1.7;word-break:break-word;color:var(--text-1)}.md-content p{margin:0 0 8px}.md-content p:last-child{margin-bottom:0}.md-content h1,.md-content h2,.md-content h3{margin:12px 0 6px;font-weight:600}.md-content h1{font-size:var(--fs-lg)}.md-content h2{font-size:var(--fs-md)}.md-content h3{font-size:var(--fs-base)}.md-content ul,.md-content ol{margin:4px 0 8px;padding-left:20px}.md-content li{margin-bottom:4px}.md-content code{background:#f3f4f6;padding:2px 6px;border-radius:4px;font-size:var(--fs-sm);color:var(--primary)}.md-content pre{background:#1e293b;color:#e2e8f0;padding:12px 16px;border-radius:var(--r-md);overflow-x:auto;margin:8px 0;font-size:var(--fs-sm)}.md-content pre code{background:transparent;padding:0;color:inherit;font-size:inherit}.md-content blockquote{border-left:3px solid var(--primary);margin:8px 0;padding:6px 12px;color:var(--text-2);background:var(--primary-light);border-radius:0 var(--r-sm) var(--r-sm) 0}.md-content strong{font-weight:600}.md-content em{font-style:italic}.md-content table{border-collapse:collapse;width:100%;margin:0;font-size:var(--fs-sm)}.md-content th,.md-content td{border:1px solid var(--border);padding:8px 10px;text-align:left}.md-content th{background:var(--primary-light);font-weight:600;color:var(--text-1)}.md-content tr:nth-child(2n) td{background:#f9fafb}.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:8px 0;border-radius:var(--r-sm);border:1px solid var(--border)}.table-scroll table{white-space:nowrap}.md-content hr{border:none;border-top:1px solid var(--border);margin:12px 0}.md-content a{color:var(--primary)}.md-content a:hover{text-decoration:underline}.loading{min-height:100vh;display:flex;align-items:center;justify-content:center;gap:10px;color:var(--text-3);font-size:var(--fs-md)}.loading .spinner{width:20px;height:20px}@media(max-width:720px){.app-shell{grid-template-columns:1fr}.admin-sidebar{height:auto;position:static;border-right:none;border-bottom:1px solid var(--border)}.admin-logo{margin-bottom:12px;padding-bottom:10px}.toolbar,.form-grid,.rule-row{grid-template-columns:1fr}.student{padding:12px}.page{padding:16px}.panel{padding:18px;gap:16px}.panel-head h1{font-size:var(--fs-lg)}.cards{grid-template-columns:1fr 1fr}.bank-sidebar{width:240px}.bank-content{padding:14px}}@media(max-width:480px){:root{font-size:16px}.top{height:auto;min-height:44px;padding:8px 12px;gap:8px;font-size:var(--fs-sm)}.top button{padding:6px 10px;font-size:var(--fs-sm)}.login-card{border-radius:var(--r-lg)}.login-brand{padding:28px 20px 24px}.login-brand h1{font-size:var(--fs-xl)}.login-brand-icon{width:44px;height:44px;border-radius:12px;margin-bottom:10px}.login-form{padding:20px;gap:12px}.student{padding:10px}.student-head{margin-bottom:10px}.student-head select{font-size:var(--fs-base)}.panel{padding:16px;gap:14px;border-radius:var(--r-md)}.panel-head h1{font-size:var(--fs-lg)}.mode-card{padding:16px;border-radius:var(--r-md)}.mode-card h3{font-size:var(--fs-md)}.mode-card p{font-size:var(--fs-sm)}.mode-card button{padding:10px}.practice-controls{grid-template-columns:1fr 1fr;gap:8px}.form-grid,.toolbar,.cards{grid-template-columns:1fr}.paper-list{gap:8px}.paper{padding:12px;gap:6px;border-radius:var(--r-sm)}.paper h3{font-size:var(--fs-base)}.mobile-layout{max-width:100%;height:100vh;height:100dvh}.exam-header{padding:10px 12px}.exam-progress{font-size:var(--fs-sm)}.exam-footer{padding:10px 12px}.exam-footer button{padding:11px}.phone-page{padding:10px;gap:10px}.question-card{padding:14px;gap:10px;border-radius:var(--r-md)}.question-card h2{font-size:var(--fs-md);line-height:1.5}.tags{gap:4px}.tags span{font-size:10px;padding:2px 7px}.option{padding:10px 12px;min-height:44px}.option b{width:24px;height:24px;font-size:var(--fs-xs)}.ai-box{padding-left:10px}.quick button{font-size:var(--fs-sm);padding:7px 12px}.bubble{font-size:var(--fs-sm);padding:9px 12px}.ask input{padding:10px 14px;font-size:var(--fs-md)}.ask button{width:42px;height:42px}button{min-height:42px}button.primary{padding:10px 16px}.student-shell{min-height:100vh}.student-tabs .tab{min-height:48px;font-size:10px;padding:6px 0}.admin-sidebar{position:static}.profile-hero{padding:20px 0 16px}.profile-avatar{width:60px;height:60px}.profile-name{font-size:var(--fs-lg)}.rule-row{grid-template-columns:1fr;gap:8px;padding:12px}.rule-row input{max-width:120px}.bank-sidebar{width:200px}.bank-sidebar.collapsed{width:0}.bank-content{padding:10px}.bank-question-view{padding-bottom:20px}.question-card{padding:12px;gap:8px}.question-card h2{font-size:var(--fs-md)}.option{padding:8px 10px;gap:8px;font-size:var(--fs-sm);min-height:40px}.option b{width:22px;height:22px;font-size:var(--fs-xs)}.bank-actions{grid-template-columns:1fr 1fr;gap:8px}.bank-actions button{padding:11px 8px;font-size:var(--fs-sm)}}