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:root{--bg:#020617;--bg-secondary:#0a1628;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#475569;--primary:#2563eb;--primary-hover:#1d4ed8;--cyan:#06b6d4;--gradient:linear-gradient(135deg, #2563eb, #06b6d4);--gradient-text:linear-gradient(135deg, #60a5fa, #22d3ee);--card-bg:#ffffff08;--card-bg-hover:#ffffff12;--border:#ffffff14;--border-hover:#60a5fa66;--correct:#10b981;--correct-bg:#10b9811f;--correct-border:#10b98166;--incorrect:#ef4444;--incorrect-bg:#ef44441f;--incorrect-border:#ef444466;--quiz:#8b5cf6;--quiz-bg:#8b5cf61f;--quiz-border:#8b5cf666;--glow-blue:#2563eb26;--glow-cyan:#06b6d41a}*{box-sizing:border-box;margin:0;padding:0}button,select,input,a{touch-action:manipulation}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text-primary);min-height:100vh;font-family:inherit;line-height:1.6;position:relative;overflow-x:hidden}body:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(#2563eb14 0%,#0000 70%);width:60%;height:60%;position:fixed;top:-20%;left:-10%}body:after{content:"";pointer-events:none;z-index:0;background:radial-gradient(#06b6d40f 0%,#0000 70%);width:50%;height:50%;position:fixed;bottom:-20%;right:-10%}main{z-index:1;position:relative}.container{max-width:960px;margin:0 auto;padding:40px 24px}header{text-align:center;margin-bottom:48px;padding-top:20px}header h1{letter-spacing:-.5px;background:var(--gradient-text);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;flex-wrap:wrap;justify-content:center;align-items:center;gap:14px;margin-bottom:10px;font-size:2.4rem;font-weight:800;display:flex}header h1 svg{fill:url(#svgGrad);filter:drop-shadow(0 0 8px #2563eb80);-webkit-text-fill-color:initial;width:30px;height:30px}header p{color:var(--text-secondary);letter-spacing:.2px;font-size:1rem;font-weight:400}.global-stats{flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:32px;display:flex}.stat-item{background:var(--card-bg);text-align:center;border:1px solid var(--border);-webkit-backdrop-filter:blur(12px);border-radius:20px;min-width:130px;padding:18px 28px;transition:all .3s}.stat-item:hover{border-color:var(--border-hover);background:var(--card-bg-hover);transform:translateY(-2px)}.stat-item span{letter-spacing:-1px;margin-bottom:4px;font-size:2rem;font-weight:700;display:block}.stat-item .label{color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;font-size:.72rem;font-weight:600}.stat-item.total span{color:#60a5fa}.stat-item.correct span{color:var(--correct)}.stat-item.incorrect span{color:var(--incorrect)}.action-row{flex-wrap:wrap;justify-content:center;gap:12px;margin-bottom:40px;display:flex}.reset-btn{background:var(--card-bg);border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;-webkit-backdrop-filter:blur(10px);border-radius:50px;padding:11px 22px;font-family:inherit;font-size:.9rem;font-weight:500;transition:all .25s}.reset-btn:hover{background:var(--card-bg-hover);border-color:var(--border-hover);color:var(--text-primary);transform:translateY(-1px)}.quiz-mode-btn{background:var(--gradient);color:#fff;cursor:pointer;border:none;border-radius:50px;align-items:center;gap:8px;padding:11px 26px;font-family:inherit;font-size:.9rem;font-weight:600;transition:all .25s;display:flex;box-shadow:0 4px 20px #2563eb59}.quiz-mode-btn:hover{opacity:.9;transform:translateY(-2px);box-shadow:0 6px 28px #2563eb80}.lectures-grid{grid-template-columns:repeat(auto-fill,minmax(min(100%,270px),1fr));gap:18px;display:grid}.lecture-card{background:var(--card-bg);border:1px solid var(--border);cursor:pointer;-webkit-backdrop-filter:blur(12px);border-radius:24px;flex-direction:column;padding:26px;transition:all .3s 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20px;font-size:.85rem;font-weight:700}.exam-result-item{border-bottom:1px solid var(--border);padding:16px 20px;transition:background .2s}.exam-result-item:last-child{border-bottom:none}.exam-result-item.result-correct{border-left:3px solid var(--correct)}.exam-result-item.result-wrong{border-left:3px solid var(--incorrect)}.result-item-header{align-items:center;gap:10px;margin-bottom:6px;display:flex}.result-num{text-transform:uppercase;color:var(--text-muted);letter-spacing:.5px;font-size:.72rem;font-weight:700}.result-badge{border-radius:50px;align-items:center;gap:4px;padding:3px 10px;font-size:.72rem;font-weight:700;display:flex}.result-badge.correct-badge{background:var(--correct-bg);color:var(--correct);border:1px solid var(--correct-border)}.result-badge.wrong-badge{background:var(--incorrect-bg);color:var(--incorrect);border:1px solid var(--incorrect-border)}.result-badge svg{fill:currentColor;width:12px;height:12px}.result-question{color:var(--text-primary);margin-bottom:10px;font-size:.9rem;font-weight:500;line-height:1.5}.result-answers{flex-direction:column;gap:5px;display:flex}.result-row{flex-wrap:wrap;align-items:baseline;gap:8px;font-size:.83rem;display:flex}.result-row-label{color:var(--text-muted);white-space:nowrap;flex-shrink:0;font-weight:600}.result-row-value{font-weight:500}.ans-correct{color:var(--correct)}.ans-wrong{color:var(--incorrect)}.nav-top-right{flex-wrap:wrap;align-items:center;gap:8px;display:flex}@media (max-width:600px){.quiz-mode-options{flex-direction:column}.exam-result-item{padding:12px 14px}.nav-top{flex-direction:column;align-items:flex-start;gap:12px}.nav-top-left{width:100%}.lecture-view-title{font-size:1.2rem}.nav-top-right{justify-content:space-between;width:100%}.nav-top-right .mode-toggle-btn,.nav-top-right .show-answers-btn{flex:1;justify-content:center;padding:12px 16px}}