@import "https://fonts.googleapis.com/css2?family=Kanit:wght@300;400;500;600;700&display=swap";:root{--primary-color:#2f4f4f;--secondary-color:#556b2f;--accent-color:#d2691e;--bg-color:beige;--card-bg:#ffffffe6;--text-dark:#1a1a1a;--text-light:#fefefe;--glass-border:#fff3}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-dark);background-image:radial-gradient(circle at 100% 0,#e0d8b0,beige);min-height:100vh;font-family:Kanit,sans-serif;line-height:1.6}h1,h2,h3,h4{color:var(--primary-color);margin-bottom:1rem;font-weight:600}p{margin-bottom:1rem}.app-container{flex-direction:column;max-width:1000px;min-height:100vh;margin:0 auto;padding:2rem;display:flex}.glass-card{background:var(--card-bg);-webkit-backdrop-filter:blur(10px);border:1px solid var(--glass-border);border-radius:16px;padding:2.5rem;box-shadow:0 8px 32px #1f26871a}.btn{background-color:var(--accent-color);color:var(--text-light);cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:.5rem;padding:.8rem 1.5rem;font-family:Kanit,sans-serif;font-size:1.1rem;font-weight:500;transition:all .3s;display:inline-flex}.btn:hover{background-color:#b85c1a;transform:translateY(-2px);box-shadow:0 4px 12px #d2691e4d}.btn-secondary{background-color:var(--secondary-color)}.btn-secondary:hover{background-color:#435425;box-shadow:0 4px 12px #556b2f4d}.btn-outline{color:var(--primary-color);border:2px solid var(--primary-color);background-color:#0000}.btn-outline:hover{background-color:var(--primary-color);color:#fff}.btn:disabled{cursor:not-allowed;box-shadow:none;background-color:#ccc;transform:none}input[type=text]{border:2px solid #ddd;border-radius:8px;width:100%;margin-bottom:.5rem;padding:.8rem 1rem;font-family:Kanit,sans-serif;font-size:1rem;transition:border-color .3s}input[type=text]:focus{border-color:var(--primary-color);outline:none}.form-group{text-align:left;margin-bottom:1.5rem}.form-group label{color:var(--primary-color);margin-bottom:.5rem;font-weight:500;display:block}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.5s forwards fadeIn}.site-header{border-bottom:2px solid #2f4f4f1a;justify-content:space-between;align-items:center;margin-bottom:2rem;padding:1rem 0;display:flex}.logo{color:var(--primary-color);align-items:center;gap:.5rem;font-size:1.5rem;font-weight:700;text-decoration:none;display:flex}.user-badge{background-color:var(--primary-color);color:#fff;border-radius:20px;align-items:center;gap:.5rem;padding:.5rem 1rem;font-size:.9rem;display:flex}.lesson-image{object-fit:cover;border-radius:12px;width:100%;max-height:400px;margin-bottom:1.5rem;box-shadow:0 4px 15px #0000001a}.quiz-option{cursor:pointer;background:#fff;border:2px solid #ddd;border-radius:8px;align-items:center;margin-bottom:1rem;padding:1rem;transition:all .2s;display:flex}.quiz-option:hover{border-color:var(--secondary-color);background:#556b2f0d}.quiz-option.selected{border-color:var(--primary-color);background:#2f4f4f1a;font-weight:600}.navigation-buttons{border-top:1px solid #ddd;justify-content:space-between;margin-top:2rem;padding-top:1rem;display:flex}