:root {
    --primary: #F59E0B;
    --primary-light: #FBBF24;
    --primary-dark: #D97706;
    --secondary: #F97316;
    --accent: #EA580C;
    --light: #FFFBEB;
    --dark: #1E293B;
    --success: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
}

body {
    font-family: 'Inter', sans-serif;
    background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
    min-height: 100vh;
    user-select: none;
    /* Para la mayoría de navegadores modernos */
    -webkit-user-select: none;
    /* Chrome, Safari */
    -moz-user-select: none;
    /* Firefox */
    -ms-user-select: none;
    /* IE/Edge antiguos */
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    transition: all 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.btn-secondary {
    background-color: var(--secondary);
    color: white;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    background-color: #EA580C;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(249, 115, 22, 0.3);
}

.btn-danger {
    background-color: var(--danger);
    color: white;
    transition: all 0.3s ease;
}

.btn-danger:hover {
    background-color: #DC2626;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.card {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
}

.progress-fill {
    height: 8px;
    border-radius: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    transition: width 0.5s ease;
}

.floating-btn {
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.3);
    transition: all 0.3s ease;
}

.floating-btn:hover {
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4);
    transform: translateY(-3px);
}

.option-card {
    transition: all 0.2s ease;
    cursor: pointer;
}

.option-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.option-card.selected {
    border: 2px solid var(--primary);
    background-color: #FFFBEB;
}

.fade-in {
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pulse {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: white;
    min-width: 200px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.1);
    z-index: 1;
    border-radius: 12px;
    overflow: hidden;
}

#btn-menu:checked~.dropdown-content {
    display: block;
}

#lessonList {
    z-index: 1000!important;
}