:root {
    --primary-dark-bg: #2e2e2e;
    --dark-text: #2e2e2e;
    --light-text: #fff;
    --accent-green: #5F9F72;
    --accent-green-darker: #4A8C60;
    --light-bg-body: #f8f9fa;
    --card-bg: #fff;
    --quiz-button-color: #198754; 
    --quiz-button-hover-color: #156d44;
}

/* =========================================
   NAVBAR CLEARANCE FIX
   ========================================= */
/* Specific spacing for this page to clear the fixed navbar */
#grammar-section {
    padding-top: 40px; /* Pushes content down on Desktop */
    padding-bottom: 10px;
    background-color: var(--light-bg-body);
    flex-grow: 1;
}

@media (max-width: 991px) {
    #grammar-section {
        padding-top: 50px; /* Pushes content down on Mobile */
    }
}

/* =========================================
   COMPONENT STYLES
   ========================================= */

.section-title {
    font-family: 'Playfair Display', serif;
    font-weight: bold;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--dark-text);
    text-align: center;
}

.content-card {
    background-color: var(--card-bg);
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    padding: 30px;
    margin-bottom: 30px;
}

/* Buttons */
.btn-primary {
    background-color: var(--quiz-button-color) !important;
    border-color: var(--quiz-button-color) !important;
}

.btn-primary:hover {
    background-color: var(--quiz-button-hover-color) !important;
    border-color: var(--quiz-button-hover-color) !important;
}

.level-select-btn {
    background-color: var(--accent-green);
    color: var(--light-text);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    margin: 5px;
    font-weight: 600;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

.level-select-btn:hover {
    background-color: var(--accent-green-darker);
    transform: translateY(-2px);
}

.level-select-btn.active {
    background-color: var(--primary-dark-bg);
    border: 2px solid var(--accent-green);
}

/* Exercise Type Buttons (Matched to Vocabulary Page) */
.exercise-btn {
    margin: 5px;
    flex: 1;
    min-width: 120px;
}

.exercise-type-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
    margin: 20px 0;
}

/* Content Area */
.grammar-content {
    min-height: 300px;
}

/* Specific styling for dynamic exercise elements */
.question {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 15px;
    margin-bottom: 15px;
}

.grammar-rule-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
}