:root{--primary: #6366f1;--primary-light: #818cf8;--primary-dark: #4f46e5;--secondary: #10b981;--secondary-light: #34d399;--accent: #f59e0b;--bg-dark: #0a0f1a;--bg-card: #111827;--bg-card-hover: #1f2937;--text-primary: #f9fafb;--text-secondary: #9ca3af;--text-muted: #6b7280;--border: #1f2937;--border-light: #374151}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:Plus Jakarta Sans,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg-dark);color:var(--text-primary);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}.account-bar{position:fixed;top:16px;right:16px;z-index:20;display:flex;align-items:center;gap:12px;max-width:calc(100vw - 32px);padding:8px 10px 8px 14px;background:#111827e6;border:1px solid var(--border-light);border-radius:12px;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:0 12px 30px #00000040}.account-bar span{max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary);font-size:13px}.account-bar button{padding:7px 12px;background:var(--bg-card-hover);border:1px solid var(--border-light);border-radius:8px;color:var(--text-primary);font-size:13px;font-weight:600;cursor:pointer;transition:all .2s}.account-bar button:hover{border-color:var(--primary);color:var(--primary-light)}.auth-shell{min-height:100vh;display:grid;place-items:center;padding:32px 20px;background:radial-gradient(ellipse at top left,rgba(99,102,241,.18),transparent 42%),radial-gradient(ellipse at bottom right,rgba(16,185,129,.12),transparent 45%),var(--bg-dark)}.auth-card{width:min(100%,440px);background:#111827eb;border:1px solid var(--border-light);border-radius:16px;padding:32px;box-shadow:0 24px 80px #00000059}.auth-brand{display:inline-flex;margin-bottom:28px;color:var(--text-primary);font-size:18px;font-weight:800;text-decoration:none}.auth-kicker{color:var(--primary-light);font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;margin-bottom:8px}.auth-card h1{font-size:30px;line-height:1.15;margin-bottom:12px}.auth-copy{color:var(--text-secondary);font-size:15px;margin-bottom:24px}.auth-form{display:grid;gap:16px}.auth-form label{display:grid;gap:8px;color:var(--text-secondary);font-size:13px;font-weight:600}.auth-form input{width:100%;padding:13px 14px;background:var(--bg-dark);border:1px solid var(--border-light);border-radius:10px;color:var(--text-primary);font:inherit;outline:none;transition:border-color .2s,box-shadow .2s}.auth-form input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f133}.auth-submit{justify-content:center;width:100%;margin-top:4px}.auth-submit:disabled{cursor:wait;opacity:.7;transform:none}.auth-error,.auth-success{padding:12px 14px;border-radius:10px;font-size:13px}.auth-error{background:#ef44441f;border:1px solid rgba(239,68,68,.3);color:#fecaca}.auth-success{background:#10b9811f;border:1px solid rgba(16,185,129,.3);color:#bbf7d0}.auth-footer{margin-top:24px;padding-top:20px;border-top:1px solid var(--border);color:var(--text-secondary);font-size:14px;text-align:center}.auth-footer a,.auth-small-link{color:var(--primary-light);font-weight:600;text-decoration:none}.auth-small-link{justify-self:center;font-size:13px}.auth-footer a:hover,.auth-small-link:hover{text-decoration:underline}.skip-link{position:absolute;top:-40px;left:0;background:var(--primary);color:#fff;padding:8px 16px;z-index:100;transition:top .3s}.skip-link:focus{top:0}.hero{position:relative;padding:80px 24px 60px;text-align:center;overflow:hidden}.hero:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(ellipse at 20% 20%,rgba(99,102,241,.15) 0%,transparent 50%),radial-gradient(ellipse at 80% 80%,rgba(16,185,129,.1) 0%,transparent 50%),radial-gradient(ellipse at 50% 50%,rgba(245,158,11,.05) 0%,transparent 70%);pointer-events:none}.hero-content{position:relative;max-width:800px;margin:0 auto}.hero-badge{display:inline-flex;align-items:center;gap:8px;background:#6366f11a;border:1px solid rgba(99,102,241,.3);padding:8px 16px;border-radius:50px;font-size:13px;font-weight:500;color:var(--primary-light);margin-bottom:24px;animation:fadeInUp .6s ease-out}.hero-badge span{width:8px;height:8px;background:var(--secondary);border-radius:50%;animation:pulse 2s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.hero h1{font-size:clamp(2.5rem,6vw,4rem);font-weight:800;line-height:1.1;margin-bottom:20px;animation:fadeInUp .6s ease-out .1s both}.hero h1 span{background:linear-gradient(135deg,var(--primary-light),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-desc{font-size:clamp(1rem,2vw,1.25rem);color:var(--text-secondary);max-width:600px;margin:0 auto 32px;animation:fadeInUp .6s ease-out .2s both}.hero-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;animation:fadeInUp .6s ease-out .3s both}.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:12px;font-size:15px;font-weight:600;text-decoration:none;transition:all .3s ease;cursor:pointer;border:none}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;box-shadow:0 4px 20px #6366f166}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px #6366f180}.btn-secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-light)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--primary)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.stats-section{padding:0 24px;margin-bottom:48px}.stats-grid{max-width:900px;margin:0 auto;display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:24px 16px;text-align:center;transition:all .3s ease}.stat-card:hover{transform:translateY(-4px);border-color:var(--primary);box-shadow:0 8px 30px #6366f126}.stat-icon{width:48px;height:48px;margin:0 auto 12px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:24px}.stat-icon.purple{background:#6366f126}.stat-icon.green{background:#10b98126}.stat-icon.amber{background:#f59e0b26}.stat-icon.cyan{background:#06b6d426}.stat-value{font-size:32px;font-weight:800;margin-bottom:4px}.stat-value.purple{color:var(--primary-light)}.stat-value.green{color:var(--secondary-light)}.stat-value.amber{color:var(--accent)}.stat-value.cyan{color:#22d3ee}.stat-label{font-size:13px;color:var(--text-muted);font-weight:500}.topics-section{padding:48px 24px;max-width:1200px;margin:0 auto}.section-header{text-align:center;margin-bottom:40px}.section-header h2{font-size:28px;font-weight:700;margin-bottom:12px}.section-header p{color:var(--text-secondary);max-width:500px;margin:0 auto}.topics-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:48px}.topic-chip{display:flex;align-items:center;gap:12px;background:var(--bg-card);border:1px solid var(--border);border-radius:12px;padding:16px;transition:all .3s ease;cursor:pointer;text-decoration:none;color:inherit}.topic-chip:hover{background:var(--bg-card-hover);border-color:var(--primary);transform:translateY(-2px)}.topic-chip.active{background:#6366f11a;border-color:var(--primary)}.topic-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:20px;flex-shrink:0}.topic-chip span{font-size:14px;font-weight:500}.container{max-width:1200px;margin:0 auto;padding:0 24px 80px}.assessments-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;flex-wrap:wrap;gap:16px}.assessments-header h2{font-size:22px;font-weight:700}.filter-tabs{display:flex;gap:8px;background:var(--bg-card);padding:6px;border-radius:10px;border:1px solid var(--border)}.filter-tab{padding:8px 16px;border-radius:8px;font-size:13px;font-weight:500;color:var(--text-secondary);background:transparent;border:none;cursor:pointer;transition:all .2s}.filter-tab:hover{color:var(--text-primary)}.filter-tab.active{background:var(--primary);color:#fff}.assessments-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:20px}.assessment-card{background:var(--bg-card);border:1px solid var(--border);border-radius:20px;padding:28px;text-decoration:none;color:inherit;display:block;transition:all .3s ease;position:relative;overflow:hidden}.assessment-card:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:0;transition:opacity .3s}.assessment-card:hover{transform:translateY(-6px);border-color:var(--primary);box-shadow:0 20px 50px #0000004d}.assessment-card:hover:before{opacity:1}.assessment-card.coming-soon{background:transparent;border:2px dashed var(--border);display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:280px;text-align:center;cursor:default}.assessment-card.coming-soon:hover{transform:none;border-color:var(--border);box-shadow:none}.card-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:20px}.card-icon{width:56px;height:56px;border-radius:14px;display:flex;align-items:center;justify-content:center;font-size:26px}.card-icon.math{background:linear-gradient(135deg,#6366f133,#6366f11a)}.card-icon.probability{background:linear-gradient(135deg,#10b98133,#10b9811a)}.card-icon.algebra{background:linear-gradient(135deg,#8b5cf633,#8b5cf61a)}.card-icon.geometry{background:linear-gradient(135deg,#f59e0b33,#f59e0b1a)}.card-icon.functions{background:linear-gradient(135deg,#06b6d433,#06b6d41a)}.card-icon.stats{background:linear-gradient(135deg,#ec489933,#ec48991a)}.card-badge{padding:6px 14px;border-radius:50px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.5px}.badge-myp4{background:#6366f126;color:var(--primary-light)}.badge-myp5{background:#10b98126;color:var(--secondary-light)}.badge-dp{background:#f59e0b26;color:var(--accent)}.card-title{font-size:20px;font-weight:700;margin-bottom:10px;line-height:1.3}.card-desc{font-size:14px;color:var(--text-secondary);margin-bottom:20px;line-height:1.6}.card-topics{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.topic-tag{padding:4px 10px;background:var(--bg-dark);border-radius:6px;font-size:11px;font-weight:500;color:var(--text-muted)}.card-meta{display:flex;gap:20px;padding-top:20px;border-top:1px solid var(--border)}.meta-item{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-secondary)}.meta-item .icon{font-size:16px;opacity:.7}.card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:20px}.difficulty{display:flex;gap:4px;align-items:center}.difficulty-label{font-size:12px;color:var(--text-muted);margin-right:8px}.difficulty span{width:10px;height:10px;border-radius:50%;background:var(--border-light)}.difficulty span.active{background:var(--secondary)}.difficulty span.warning{background:var(--accent)}.start-btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border-radius:10px;font-size:14px;font-weight:600;transition:all .3s}.assessment-card:hover .start-btn{gap:10px}.coming-soon-icon{font-size:48px;margin-bottom:16px;opacity:.4}.coming-soon-title{font-size:16px;font-weight:600;margin-bottom:6px;color:var(--text-secondary)}.coming-soon-topics{font-size:13px;color:var(--text-muted)}.features-section{padding:64px 24px;background:var(--bg-card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.features-grid{max-width:1000px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:32px}.feature-card{text-align:center;padding:24px}.feature-icon{width:64px;height:64px;margin:0 auto 20px;background:linear-gradient(135deg,#6366f11a,#6366f10d);border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px}.feature-card h3{font-size:18px;font-weight:700;margin-bottom:10px}.feature-card p{font-size:14px;color:var(--text-secondary);line-height:1.6}.footer{padding:40px 24px;text-align:center;border-top:1px solid var(--border)}.footer-content{max-width:600px;margin:0 auto}.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:20px}.footer-links a{color:var(--text-secondary);text-decoration:none;font-size:14px;transition:color .2s}.footer-links a:hover{color:var(--primary)}.footer-text{font-size:13px;color:var(--text-muted)}.history-section{max-width:1200px;margin:0 auto;padding:0 24px 60px}.history-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.history-header h2{font-size:22px;font-weight:700}.history-clear-btn{padding:8px 16px;background:var(--bg-card);border:1px solid var(--border-light);border-radius:8px;color:var(--text-secondary);font-size:13px;cursor:pointer;transition:all .2s}.history-clear-btn:hover{border-color:var(--danger);color:var(--danger)}.history-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.history-card{background:var(--bg-card);border:1px solid var(--border);border-radius:16px;padding:20px;transition:all .3s ease}.history-card:hover{border-color:var(--primary);transform:translateY(-2px)}.history-card-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:12px}.history-student{font-weight:600;font-size:16px}.history-class{font-size:12px;color:var(--text-muted);margin-top:2px}.history-quiz{font-size:13px;color:var(--text-secondary);margin-bottom:8px}.history-score{font-size:28px;font-weight:800;background:linear-gradient(135deg,var(--primary-light),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:4px}.history-date{font-size:12px;color:var(--text-muted)}.history-empty{text-align:center;padding:60px 20px;background:var(--bg-card);border:2px dashed var(--border);border-radius:16px;color:var(--text-secondary)}.history-empty-icon{font-size:48px;margin-bottom:16px;opacity:.5}@media (max-width: 768px){.account-bar{left:16px;right:16px;justify-content:space-between}.account-bar span{max-width:min(220px,55vw)}.hero{padding:60px 20px 40px}.hero-actions{flex-direction:column;align-items:center}.stats-grid{grid-template-columns:repeat(2,1fr)}.stat-card{padding:20px 12px}.stat-value{font-size:26px}.topics-grid{grid-template-columns:repeat(2,1fr)}.assessments-grid{grid-template-columns:1fr}.assessments-header{flex-direction:column;align-items:flex-start}.filter-tabs{width:100%;overflow-x:auto}.features-grid{grid-template-columns:1fr}}@media (max-width: 480px){.topics-grid{grid-template-columns:1fr}.topics-section{padding:32px 16px}.container{padding:0 16px 60px}}.btn:focus-visible,.filter-tab:focus-visible,.assessment-card:focus-visible,.topic-chip:focus-visible,.account-bar button:focus-visible,.auth-form input:focus-visible,.auth-small-link:focus-visible,.auth-footer a:focus-visible{outline:2px solid var(--primary);outline-offset:2px}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}