:root {
    --accent-gold: #d4af37;
    --gold-gradient: linear-gradient(135deg, #d4af37 0%, #f7ef8a 100%);
    --navy-blue: #0a1172;
    --deep-blue: #1a237e;
    --charcoal: #2c3e50;
    --dark-gray: #495057;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --white: #ffffff;
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html,
body {
    height: 100%;
}

body {
    font-family: 'Poppins', sans-serif;
    line-height: 1.6;
    color: var(--charcoal);
    background: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1 0 auto;
    width: 100%;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.page-header {
    text-align: center;
    padding: 40px 0;
    position: relative;
}

.page-header h1 {
    font-size: 2.5rem;
    color: #000;
    margin-bottom: 10px;
}

.page-header::after {
    content: '';
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gold-gradient);
    border-radius: 2px;
}

/* Courses Grid */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
    padding-bottom: 50px;
}

.course-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    border: 1px solid rgba(212, 175, 55, 0.1);
    position: relative;
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-gold);
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gold-gradient);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.course-title {
    font-size: 1.25rem;
    color: var(--navy-blue);
    margin-bottom: 15px;
}

.course-details {
    list-style: none;
    margin: 15px 0;
}

.course-details li {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.course-details i {
    color: var(--accent-gold);
    width: 18px;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    width: 90%;
    max-width: 750px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    background: linear-gradient(135deg, var(--navy-blue) 0%, var(--deep-blue) 100%);
    padding: 25px 30px;
    color: var(--white);
    position: relative;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--accent-gold);
    border: none;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
}

.close-modal:hover {
    transform: rotate(90deg);
    background: #fff;
}

.modal-body {
    padding: 30px;
}

.info-card {
    background: var(--light-gray);
    padding: 15px;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-gold);
    margin-bottom: 15px;
}

.modal-btn {
    padding: 12px 25px;
    border-radius: 8px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background: var(--gold-gradient);
    color: var(--navy-blue);
}

.btn-secondary {
    background: var(--navy-blue);
    color: #fff;
}

@keyframes spin {
    100% {
        transform: rotate(360deg);
    }
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #eee;
    border-top-color: var(--accent-gold);
    border-radius: 50%;
    margin: 20px auto;
    animation: spin 1s linear infinite;
}