:root {
    --primary-color: #FF6B6B;
    --secondary-color: #4ECDC4;
    --background-color: #F7F7F7;
    --text-color: #2D3436;
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.2);
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
}

[data-theme="dark"] {
    --primary-color: #FF8787;
    --secondary-color: #66F2E8;
    --background-color: #1A1A1A;
    --text-color: #E0E0E0;
    --glass-bg: rgba(0, 0, 0, 0.25);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.35);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.3s ease;
}

body {
    background: var(--background-color);
    color: var(--text-color);
    font-family: 'Poppins', sans-serif;
    overflow-x: hidden;
}

 /* Navbar Styles */
 .navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 2rem;
}

.navbar-brand {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color) !important;
}

.nav-link {
    color: var(--text-color) !important;
    font-weight: 500;
    margin: 0 1rem;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}
/* Classes Header */
.classes-header {
    padding: 120px 0 60px;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    position: relative;
    overflow: hidden;
}

.classes-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://picsum.photos/1920/1080?random=1') center/cover;
    opacity: 0.2;
}

.classes-header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    position: relative;
}

/* Class Cards */
.class-card {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 1.5rem;
    margin: 1rem 0;
    transition: all 0.3s ease;
    box-shadow: var(--card-shadow);
    position: relative;
    overflow: hidden;
}

.class-card:hover {
    transform: translateY(-10px);
}

.class-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
    border-radius: 15px;
    margin-bottom: 1rem;
}

.class-tag {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.class-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 1rem 0;
}

.class-schedule {
    background: var(--glass-bg);
    padding: 2rem;
    border-radius: 20px;
    margin: 2rem 0;
    box-shadow: var(--card-shadow);
}

.schedule-table {
    width: 100%;
    border-collapse: collapse;
}

.schedule-table th,
.schedule-table td {
    padding: 1rem;
    text-align: center;
    border: 1px solid var(--glass-border);
}

.schedule-table th {
    background: var(--primary-color);
    color: white;
}

.btn-book {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-book:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Filters */
.filter-section {
    padding: 2rem 0;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    margin-bottom: 2rem;
}

.filter-btn {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--text-color);
    padding: 0.5rem 1.5rem;
    margin: 0.5rem;
    border-radius: 50px;
    transition: all 0.3s ease;
}

.filter-btn.active,
.filter-btn:hover {
    background: var(--primary-color);
    color: white;
}

/* Instructor Badge */
.instructor-badge {
    display: flex;
    align-items: center;
    margin-top: 1rem;
}

.instructor-badge img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 1rem;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
}

.theme-toggle i {
    font-size: 1.5rem;
    color: var(--text-color);
}

@media (max-width: 768px) {
    .classes-header h1 {
        font-size: 2.5rem;
    }
    
    .schedule-table {
        font-size: 0.8rem;
    }
}