:root {
    --primary-color: #007A4D;  
    --secondary-color: #2ecc71;  
    --accent-color: #FFD700;  
    --light-green: #90EE90;  
    --background-color: #F0FFF0;  
    --text-color: #2c3e50;
    --grid-columns: 4;
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

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

.main-header {
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.university-logo {
    margin-right: 30px;
}

.university-logo .logo-svg {
    width: 150px;
    height: 150px;
    object-fit: contain;
}

.header-content {
    flex-grow: 1;
    text-align: left;
}

.header-content h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.header-content .subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.course-card {
    background: white;
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.course-card.registration-card {
    grid-column: 1 / 2;
    grid-row: 1;
}

.course-card.fees-card {
    grid-column: 2 / 3;
    grid-row: 1;
}

.course-card.schedule-card {
    grid-column: 3 / 4;
    grid-row: 1;
}

.course-card.payment-card {
    grid-column: 4 / 5;
    grid-row: 1;
}

.course-card.instructor-card {
    grid-column: 1 / 2;
    grid-row: 2;
}

.course-card.course-details-card {
    grid-column: 2 / 5;
    grid-row: 2;
}

.course-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.15);
}

.course-card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.2rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 10px;
}

.payment-card .payment-info {
    background-color: rgba(46, 204, 113, 0.1);
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 15px;
    text-align: center;
}

.payment-card .phone-number {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1.1rem;
    background-color: var(--accent-color);
    display: inline-block;
    padding: 5px 10px;
    border-radius: 20px;
    margin-bottom: 5px;
}

.payment-card .reference {
    color: var(--text-color);
    opacity: 0.8;
}

.payment-card .bkash-steps {
    background-color: rgba(46, 204, 113, 0.1);
    padding: 10px;
    border-radius: 8px;
    margin-top: 10px;
    color: var(--primary-color);
    font-size: 0.9rem;
}

.payment-card .bkash-steps li {
    margin-left: 20px;
    padding: 5px 0;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.payment-card .bkash-steps li:last-child {
    border-bottom: none;
}

.payment-card .send-money-instructions {
    font-weight: bold;
    color: var(--primary-color);
    margin-top: 10px;
}

.register-btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--primary-color);
    padding: 10px 20px;
    text-decoration: none;
    border-radius: 25px;
    transition: transform 0.3s ease;
    font-weight: bold;
    border: 2px solid var(--primary-color);
}

.register-btn:hover {
    transform: scale(1.05);
}

.payment-logo img {
    max-width: 150px;
    margin: 15px 0;
}

.instructor-profile img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-color);
}

.course-details-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.course-section {
    background-color: var(--light-green);
    border-radius: 10px;
    padding: 15px;
    transition: transform 0.3s ease;
    border: 1px solid var(--primary-color);
}

.course-section:hover {
    transform: scale(1.03);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.course-section h4 {
    color: var(--primary-color);
    background-color: var(--accent-color);
    padding: 10px;
    margin-bottom: 10px;
    text-align: center;
    border-radius: 5px;
}

.course-section ul {
    list-style-type: none;
}

.course-section li {
    padding: 5px 0;
    border-bottom: 1px solid #e0e0e0;
    transition: background-color 0.3s ease;
}

.course-section li:last-child {
    border-bottom: none;
}

.course-section li:hover {
    background-color: rgba(46, 204, 113, 0.1);
    padding-left: 10px;
}

.site-footer {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 30px;
    border-radius: 0 0 15px 15px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.course-card {
    animation: fadeIn 0.8s ease forwards;
    opacity: 0;
}

@media (max-width: 768px) {
    .course-grid {
        grid-template-columns: 1fr;
    }

    .course-card.instructor-card {
        grid-column: 1;
    }

    .course-card.course-details-card {
        grid-column: 1;
    }

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

@media (max-width: 1024px) {
    .course-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .course-card.instructor-card {
        grid-column: 1;
    }

    .course-card.course-details-card {
        grid-column: 1 / 3;
    }
}