:root{--bg-color: #0f0f13;--card-bg: #1a1a23;--text-primary: #ffffff;--text-secondary: #a1a1aa;--accent-color: #6366f1;--accent-hover: #4f46e5;--danger-color: #ef4444;--success-color: #22c55e;--border-color: #27272a;--font-family: "Inter", system-ui, sans-serif}body{margin:0;font-family:var(--font-family);background-color:var(--bg-color);color:var(--text-primary);-webkit-font-smoothing:antialiased;line-height:1.6}*{box-sizing:border-box}button{cursor:pointer;font-family:inherit}.container{max-width:800px;margin:0 auto;padding:2rem}.glass-panel{background:#1a1a23b3;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.1);border-radius:16px;padding:2rem;box-shadow:0 4px 30px #00000080}h1,h2,h3{margin-top:0;font-weight:700;letter-spacing:-.02em}h1{font-size:2.5rem;margin-bottom:1rem}h2{font-size:1.8rem;margin-bottom:.8rem}p{margin-bottom:1.5rem;color:var(--text-secondary)}textarea{width:100%;background:#121216;border:1px solid var(--border-color);border-radius:8px;padding:1rem;color:var(--text-primary);font-size:1rem;resize:vertical;min-height:100px;transition:border-color .2s}textarea:focus{outline:none;border-color:var(--accent-color)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:.75rem 1.5rem;border-radius:8px;font-weight:600;border:none;transition:all .2s;font-size:1rem}.btn-primary{background:var(--accent-color);color:#fff}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-secondary{background:transparent;border:1px solid var(--border-color);color:var(--text-secondary)}.btn-secondary:hover{border-color:var(--text-primary);color:var(--text-primary)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#000c;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease}.modal-content{width:90%;max-width:600px;max-height:90vh;overflow-y:auto;animation:slideUp .3s ease}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.quiz-question{margin-bottom:2rem}.quiz-option{display:block;width:100%;text-align:left;padding:1rem;margin-bottom:.5rem;background:#ffffff0d;border:1px solid transparent;border-radius:8px;color:var(--text-secondary);transition:all .2s}.quiz-option:hover{background:#ffffff1a}.quiz-option.selected{background:#6366f133;border-color:var(--accent-color);color:#fff}