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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background-color: #FFFFFF;
    color: #5A6B7C;
    line-height: 1.6;
}

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

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 10px;
    color: #1A73E8;
}

.header p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.course-card {
    background-color: #FFFFFF;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
}

.course-image {
    height: 200px;
    background-color: #E3F2FD;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.course-image::before {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(202, 240, 248, 0.3) 0%, rgba(227, 242, 253, 0) 70%);
    z-index: 1;
}

.course-image .placeholder {
    font-size: 3rem;
    color: #1A73E8;
    z-index: 2;
    text-align: center;
    padding: 20px;
}

.course-content {
    padding: 25px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.course-title {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.course-icon {
    font-size: 1.5rem;
    margin-right: 12px;
    color: #1A73E8;
    width: 30px;
    text-align: center;
}

.course-content h3 {
    font-size: 1.4rem;
    color: #1A73E8;
}

.course-content p {
    margin-bottom: 20px;
    flex-grow: 1;
}

.course-btn {
    display: inline-block;
    background-color: #1A73E8;
    color: white;
    padding: 10px 20px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 500;
    text-align: center;
    transition: background-color 0.3s ease;
}

.course-btn:hover {
    background-color: #0d5dc1;
}

@media (max-width: 992px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .header h1 {
        font-size: 2rem;
    }
}