/* Theme Variables - must match other pages */
:root {
    /* Brand Colors */
    --primary-color: #427770;
    --secondary-color: #6caaa9;
    --accent-color: #a5e4da;
    
    /* UI Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f0f4f5;
    --text-primary: #04262b;
    --text-secondary: #445c5c;
    --border-color: #cdd8d8;
    
    /* Interactive States */
    --hover-bg: #e1f2f1;
    --active-bg: #84c4bb;
    --shadow-color: rgba(4, 38, 43, 0.08);
    
    /* Additional Variables */
    --gradient-primary: linear-gradient(135deg, #427770, #6caaa9);
    --gradient-success: linear-gradient(135deg, #a5e4da, #6caaa9);
    --warning-color: #ff9f80;
}

[data-theme="dark"] {
    /* Brand Colors remain the same */
    --primary-color: #84c4bb;
    --secondary-color: #6caaa9;
    --accent-color: #a5e4da;
    
    /* UI Colors - Dark Theme */
    --bg-primary: #0b1c1e;
    --bg-secondary: #16282a;
    --text-primary: #eff9f9;
    --text-secondary: #9ec3c3;
    --border-color: #355c5e;
    
    /* Interactive States */
    --hover-bg: #1d3c3f;
    --active-bg: #6caaa9;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

/* Base Styles */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

/* Navbar Styles */
.navbar {
    background-color: var(--bg-secondary) !important;
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    box-shadow: 0 4px 6px var(--shadow-color);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    color: var(--primary-color) !important;
    font-weight: 600;
    font-size: 1.5rem;
}

.nav-link {
    color: var(--text-primary) !important;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

/* Course Cards */
.course-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(4, 38, 43, 0.12);
}

.course-content {
    padding: 1.5rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.category-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: capitalize;
    letter-spacing: 0.02em;
    border-radius: 0.375rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    margin-bottom: 0.75rem;
}

.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 0.75rem 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.rating-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.rating-stars {
    display: flex;
    gap: 0.1rem;
}

.rating-stars i {
    color: #ffd700;
    font-size: 0.95rem;
}

.rating-value {
    font-weight: 500;
}

.student-count {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.student-count i {
    color: var(--primary-color);
}

.course-credits {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

/* Buttons */
.btn-primary {
    background: var(--primary-color);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.btn-primary:hover {
    background: var(--secondary-color);
}

/* Footer Styles */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer p {
    color: var(--text-primary);
    font-weight: 500;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
}

.social-links a {
    color: var(--text-secondary);
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.social-links a:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
}

/* Dark Theme Footer Adjustments */
[data-theme="dark"] .footer {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .social-links a {
    color: var(--text-secondary);
}

[data-theme="dark"] .social-links a:hover {
    color: var(--accent-color);
}

/* Navbar Theme Toggle Enhancements */
.theme-toggle {
    background: transparent;
    border: none;
    padding: 0.5rem;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all 0.3s ease;
    cursor: pointer;
}

.theme-toggle:hover {
    background: var(--hover-bg);
    transform: rotate(15deg);
}

.theme-toggle i {
    font-size: 1.2rem;
}

/* Credits Display */
#userCredits {
    background: var(--primary-color);
    color: var(--bg-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

/* Filter Sidebar */
.filter-sidebar {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    position: sticky;
    top: 100px;
    transition: all 0.3s ease;
}

.filter-sidebar h5 {
    color: var(--text-primary);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.form-label {
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-select {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(66, 119, 112, 0.2);
    outline: none;
}

.form-select option {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Dark mode specific adjustments */
[data-theme="dark"] .filter-sidebar {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .form-select {
    background-color: var(--bg-primary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-select option {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

[data-theme="dark"] .course-card {
    background: var(--bg-secondary);
    border-color: var(--border-color);
}

[data-theme="dark"] .course-card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .category-badge {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

[data-theme="dark"] .course-meta {
    color: var(--text-secondary);
}

[data-theme="dark"] .rating-stars i {
    color: #ffd700;
}

[data-theme="dark"] .student-count i {
    color: var(--primary-color);
}

[data-theme="dark"] .course-credits {
    color: var(--primary-color);
}

/* Empty state styling for dark mode */
[data-theme="dark"] .empty-state {
    color: var(--text-secondary);
}

[data-theme="dark"] .empty-state i {
    color: var(--border-color);
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .filter-sidebar {
        position: relative;
        top: 0;
        margin-bottom: 2rem;
    }
}