@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;600&display=swap";:root{--bg: #060b16;--bg2: #0b1526;--bg3: #101d33;--surface: #142238;--surface2: #1a2c48;--border: #223655;--border2: #2f4972;--text: #eaf2ff;--text2: #9db3d6;--text3: #6883ab;--accent: #2563eb;--accent2: #3b82f6;--teal: #0ea5e9;--teal2: #38bdf8;--green: #22c55e;--yellow: #eab308;--red: #ef4444;--orange: #f97316;--radius: 10px;--radius2: 16px;--shadow: 0 4px 24px rgba(0,0,0,.5)}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:Inter,system-ui,sans-serif;font-size:15px;line-height:1.6;min-height:100vh}a{color:var(--accent2);text-decoration:none}a:hover{color:var(--text)}button{cursor:pointer;font-family:inherit}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:var(--bg2)}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius2);padding:1.5rem}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border-radius:var(--radius);font-size:14px;font-weight:600;border:none;transition:all .15s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent2);transform:translateY(-1px)}.btn-ghost{background:transparent;color:var(--text2);border:1px solid var(--border)}.btn-ghost:hover{background:var(--surface2);color:var(--text)}.btn-sm{padding:6px 14px;font-size:13px}.btn-teal{background:var(--teal);color:#fff}.btn-teal:hover{background:var(--teal2)}.btn-green{background:var(--green);color:#fff}.badge-pill{display:inline-flex;align-items:center;padding:2px 10px;border-radius:20px;font-size:12px;font-weight:600}.tag-i1{background:#2563eb26;color:var(--accent2)}.tag-i2{background:#0ea5e926;color:var(--teal2)}.tag-i3{background:#eab30826;color:var(--yellow)}.tag-eval{background:#ef44441f;color:#fca5a5}.video-wrap{position:relative;padding-top:56.25%;border-radius:var(--radius);overflow:hidden;background:#000;margin:.5rem 0}.video-wrap iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.progress-bar{background:var(--border);border-radius:4px;height:6px;overflow:hidden}.progress-bar-fill{height:100%;border-radius:4px;background:linear-gradient(90deg,var(--accent),var(--teal));transition:width .4s ease}.quiz-option{width:100%;text-align:left;padding:12px 16px;margin-bottom:8px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface2);color:var(--text);font-size:14px;transition:all .12s}.quiz-option:hover:not(:disabled){border-color:var(--accent);background:var(--bg3)}.quiz-option.selected{border-color:var(--accent);background:#2563eb1a}.quiz-option.correct{border-color:var(--green);background:#22c55e1a;color:var(--green)}.quiz-option.wrong{border-color:var(--red);background:#ef444414;color:#fca5a5}.lesson-content h3{font-size:1rem;color:var(--teal2);margin:1rem 0 .4rem}.lesson-content p{color:var(--text2);margin-bottom:.6rem}.lesson-content strong{color:var(--text)}.lesson-content code{font-family:JetBrains Mono,monospace;background:var(--bg);padding:2px 6px;border-radius:4px;font-size:13px;color:var(--teal2)}.lesson-content pre{background:var(--bg);padding:1rem;border-radius:var(--radius);font-family:JetBrains Mono,monospace;font-size:13px;color:var(--teal2);white-space:pre-wrap;margin:.5rem 0}.lesson-content ul,.lesson-content ol{padding-left:1.5rem;color:var(--text2);margin-bottom:.6rem}.lesson-content li{margin-bottom:.2rem}.star-grade{font-size:1.5rem}.data-table{width:100%;border-collapse:collapse;font-size:13px}.data-table th{background:var(--bg3);color:var(--text2);padding:8px 12px;text-align:left;border-bottom:1px solid var(--border)}.data-table td{padding:10px 12px;border-bottom:1px solid var(--border);color:var(--text)}.data-table tr:hover td{background:var(--surface2)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn .25s ease}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.pulse{animation:pulse 1.5s infinite}.stars-bg{position:fixed;top:0;right:0;bottom:0;left:0;z-index:-1;overflow:hidden;background:radial-gradient(ellipse at 20% 50%,rgba(37,99,235,.08) 0%,transparent 50%),radial-gradient(ellipse at 80% 20%,rgba(14,165,233,.06) 0%,transparent 40%),var(--bg)}.stars-bg:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background-image:radial-gradient(1px 1px at 20% 30%,rgba(255,255,255,.4) 0%,transparent 100%),radial-gradient(1px 1px at 50% 10%,rgba(255,255,255,.3) 0%,transparent 100%),radial-gradient(1px 1px at 80% 50%,rgba(255,255,255,.4) 0%,transparent 100%),radial-gradient(1px 1px at 10% 70%,rgba(255,255,255,.2) 0%,transparent 100%),radial-gradient(1px 1px at 65% 80%,rgba(255,255,255,.3) 0%,transparent 100%),radial-gradient(1.5px 1.5px at 35% 55%,rgba(255,255,255,.5) 0%,transparent 100%)}