body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #ffffff;
    color: #333333;
}

.header {
    background-color: #ff5722;
    color: white;
    padding: 15px;
    position: relative;
}

.banner {
    background-color: #ff5722;
    color: white;
    padding: 20px;
    text-align: center;
    position: relative;
}

.banner h1 {
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 15px;
}

.banner-btn {
    background-color: #ffc107;
    color: #333333;
    border: none;
    padding: 10px 30px;
    border-radius: 20px;
    font-size: 16px;
    font-weight: bold;
}

.gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 5px;
    padding: 5px;
}

.gallery img {
    width: 100%;
    height: 100px;
    object-fit: cover;
}

.features {
    padding: 20px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin-bottom: 20px;
}

.feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.feature-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: #ff5722;
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: bold;
}

.feature-plus {
    color: #ff5722;
    font-size: 20px;
    font-weight: bold;
    margin: 0 10px;
}

.price-section {
    padding: 0 20px 20px;
}

.price {
    font-size: 28px;
    font-weight: bold;
    color: #ff5722;
    margin-right: 10px;
}

.original-price {
    font-size: 16px;
    color: #999999;
    text-decoration: line-through;
}

.course-info {
    padding: 0 20px 20px;
}

.course-title {
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 10px;
}

.course-tag {
    display: inline-block;
    background-color: #f0f0f0;
    color: #666666;
    padding: 3px 10px;
    border-radius: 10px;
    font-size: 12px;
}

.students-info {
    padding: 0 20px 20px;
    display: flex;
    align-items: center;
}

.student-avatars {
    display: flex;
    margin-right: 10px;
}

.avatar {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    margin-left: -10px;
    border: 2px solid white;
}

.student-count {
    font-size: 14px;
    color: #666666;
}

.course-details {
    padding: 20px;
    border-top: 1px solid #f0f0f0;
    border-bottom: 1px solid #f0f0f0;
    margin-bottom: 20px;
}

.details-title {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 15px;
}

.course-content {
    line-height: 1.6;
}

.course-content p {
    margin-bottom: 15px;
    color: #333333;
}

.course-content h3 {
    font-size: 16px;
    font-weight: bold;
    margin: 20px 0 10px;
    color: #333333;
}

.course-content ul {
    margin: 0 0 20px 20px;
}

.course-content li {
    margin-bottom: 8px;
    color: #333333;
}

.course-image {
    margin: 20px 0;
}

.course-image img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.buy-section {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: white;
    padding: 20px;
    text-align: center;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    z-index: 999;
}

.buy-btn {
    background-color: #ff5722;
    color: white;
    border: none;
    padding: 15px;
    border-radius: 25px;
    font-size: 18px;
    font-weight: bold;
    width: 100%;
    max-width: 300px;
}

.buy-placeholder {
    height: 100px;
    width: 100%;
}

.toast {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px 20px;
    border-radius: 5px;
    font-size: 16px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 9999;
}

.toast.show {
    opacity: 1;
    visibility: visible;
}