* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

footer .container {
    text-align: center;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s;
}

nav a:hover {
    color: #667eea;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0;
    color: white;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 2rem;
    opacity: 0;
    animation: fadeInUp 1s ease 0.3s forwards;
}

/* Filter Section */
.filters {
    background: white;
    padding: 2rem 0;
    margin: 2rem 0;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.filter-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 25px;
    background: #f8f9fa;
    color: #333;
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

.filter-btn.active,
.filter-btn:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

/* Schedule Grid */
.schedule-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.class-card {
    background: white;
    border-radius: 15px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: all 0.3s;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.6s ease forwards;
}

.class-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.class-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.class-name {
    font-size: 1.3rem;
    font-weight: bold;
    color: #333;
    margin-bottom: 0.5rem;
}

.class-type {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.class-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin: 1rem 0;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: #666;
}

.detail-item i {
    color: #667eea;
    width: 16px;
}

.instructor {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 10px;
    margin: 1rem 0;
}

.instructor-name {
    font-weight: bold;
    color: #333;
    margin-bottom: 0.3rem;
}

.instructor-bio {
    font-size: 0.9rem;
    color: #666;
}

.book-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border: none;
    border-radius: 10px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    margin-top: 1rem;
}

.book-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

.hidden {
    display: none;
}

/* Animations */
@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    .class-details {
        grid-template-columns: 1fr;
    }

    nav ul {
        flex-direction: column;
        gap: 1rem;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
}

/* Form styles */
.form {
    display: grid;
    gap: 1rem;
}

.form label {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    color: #333;
    font-weight: 600;
}

.form input[type="text"],
.form input[type="number"],
.form input[type="datetime-local"],
.form select {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: #fff;
    color: #333;
    text-align: left;
}

.form input[type="text"]::placeholder,
.form input[type="number"]::placeholder,
.form input[type="datetime-local"]::placeholder {
    color: #999;
}

.form .actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-start;
}