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var(--border-color);margin-top:2rem;padding-top:1.5rem}.guest-promo p{color:var(--text-secondary);margin-bottom:1rem;font-size:.875rem}.leaderboard-item{border-radius:var(--radius-sm);background:#00000005;align-items:center;gap:1rem;margin-bottom:.5rem;padding:.75rem;display:flex}.leaderboard-item.is-me{border-left:3px solid var(--primary-color);background:#3b82f61a}.lb-rank{font-size:1.25rem}.lb-name{flex:1;font-weight:500}.lb-score{color:var(--primary-color);font-weight:700}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1.5rem;margin-bottom:2rem;display:grid}.activity-feed{margin-top:1.5rem;padding-left:1.5rem;position:relative}.activity-feed:before{content:"";background:var(--border-color);width:2px;position:absolute;top:0;bottom:0;left:7px}.activity-item{margin-bottom:1.5rem;position:relative}.activity-item:last-child{margin-bottom:0}.activity-marker{background:var(--surface-color);border:4px solid var(--primary-color);border-radius:50%;width:16px;height:16px;position:absolute;top:.25rem;left:-1.5rem}.activity-content h4{color:var(--text-primary);margin:0 0 .25rem}.activity-content p{color:var(--text-secondary);margin:0;font-size:.875rem}.onboarding-page{background:var(--bg-color);justify-content:center;align-items:center;min-height:100vh;padding:2rem;display:flex}.onboarding-loading{min-height:100vh;color:var(--text-secondary);justify-content:center;align-items:center;font-size:1.25rem;display:flex}.onboarding-container{border-radius:var(--radius-lg);flex-direction:column;gap:2rem;width:100%;max-width:800px;padding:3rem;display:flex}.onboarding-title{color:var(--text-primary);text-align:center;margin:0;font-size:2.5rem;font-weight:800}.onboarding-subtitle{color:var(--text-secondary);text-align:center;margin:0 0 1rem;font-size:1.1rem}.courses-list{flex-direction:column;gap:2.5rem;display:flex}.course-title{color:var(--text-primary);border-bottom:1px solid var(--border-color);margin-bottom:1rem;padding-bottom:.5rem;font-size:1.25rem;font-weight:600}.subjects-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:1rem;display:grid}.subject-card{background:var(--surface-color);border:2px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;text-align:center;flex-direction:column;align-items:center;gap:.75rem;padding:1.5rem 1rem;transition:all .2s;display:flex}.subject-card:hover{box-shadow:var(--shadow-md);border-color:var(--primary-color);transform:translateY(-2px)}.subject-card.selected{background:var(--primary-color);border-color:var(--primary-color);color:#fff}.subject-card.selected .subject-name{color:#fff}.subject-icon{opacity:.8;font-size:1.5rem;font-weight:700}.subject-name{color:var(--text-primary);font-size:1rem;font-weight:600}.onboarding-footer{border-top:1px solid var(--border-color);justify-content:flex-end;margin-top:2rem;padding-top:2rem;display:flex}.finish-btn{background:var(--primary-color);color:#fff;border-radius:var(--radius-md);cursor:pointer;border:none;padding:1rem 2rem;font-size:1.1rem;font-weight:600;transition:opacity .2s}.finish-btn:disabled{opacity:.5;cursor:not-allowed}.finish-btn:not(:disabled):hover{opacity:.9}:root{--bg-color:#f8fafc;--surface-color:#fff;--text-primary:#0f172a;--text-secondary:#64748b;--primary-color:#3b82f6;--primary-hover:#2563eb;--success-color:#10b981;--error-color:#ef4444;--border-color:#e2e8f0;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:1rem;--font-sans:"Inter", system-ui, -apple-system, sans-serif}@media (prefers-color-scheme:dark){:root{--bg-color:#0f172a;--surface-color:#1e293b;--text-primary:#f8fafc;--text-secondary:#94a3b8;--border-color:#334155;--shadow-sm:0 1px 2px 0 #0000004d;--shadow-md:0 4px 6px -1px #0000004d, 0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #0000004d, 0 4px 6px -4px #0000004d}}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;line-height:1.5;transition:background-color .3s,color .3s}a{color:inherit;text-decoration:none}button,input,textarea{font-family:inherit}.glass{background:rgba(var(--surface-color), .7);-webkit-backdrop-filter:blur(10px);border:1px solid var(--border-color)}.fade-in{animation:.4s forwards fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}body.presentation-mode{font-size:125%}body.presentation-mode .container{max-width:100%;padding:0 2rem}body.presentation-mode button,body.presentation-mode input,body.presentation-mode select{padding:.75em 1em;font-size:1.1em}body.presentation-mode .spreadsheet-cell input{padding:.5rem;font-size:1.2rem}body.presentation-mode .nav-links{gap:1.5rem}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-color)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-md)}::-webkit-scrollbar-thumb:hover{background:var(--text-secondary)}