body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 0;
    color: #333;
    background-color: #f0f8ff;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: #060933;
    position: relative;
}

.navbar .logo {
    color: #fff;
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar .nav-links {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    transition: max-height 0.3s ease-out;
    padding-left: 0;
    margin: 0;
}

.navbar .nav-links li {
    display: inline;
}

.navbar .nav-links a {
    color: #fff;
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.navbar .nav-links a:hover {
    color: #cce7ff;
}

.menu-toggle {
    display: none;
    font-size: 2rem;
    color: #fff;
    cursor: pointer;
}

.hero {
    display: flex;
    align-items: center;
    justify-content: center;
    height: calc(100vh - 60px); /* ลดขนาดตาม navbar */
    background: linear-gradient(to right, #007bff, #66aaff);
    color: #fff;
    text-align: center;
    padding: 0 2rem;
}

.hero .content {
    max-width: 600px;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.about-hero {
    background: linear-gradient(to right, #66aaff, #007bff);
}

.courses-hero {
    background: linear-gradient(to right, #33ccff, #0066cc);
}

.blog-hero {
    background: linear-gradient(to right, #66ffcc, #33cc99);
}

.contact-hero {
    background: linear-gradient(to right, #ffcc66, #ff9933);
}

main {
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

section {
    background: #f4f4f4;
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 2rem;
}

h1, h2 {
    color: #007bff;
}

img {
    display: block;
    margin: 1rem auto;
    max-width: 100%;
}

.video-container {
    text-align: center;
    margin: 2rem 0;
}

.cta-button {
    background-color: #ffcc00;
    color: #333;
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: #ffd966;
}

footer {
    background-color: #007bff;
    color: #fff;
    text-align: center;
    padding: 1rem;
}

@media screen and (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-links {
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: #007bff;
        max-height: 0;
        overflow: hidden;
        z-index: 1000;
    }

    .nav-links.active {
        max-height: 300px; /* ปรับค่านี้ตามจำนวนเมนู */
    }

    .nav-links li {
        width: 100%;
        text-align: center;
        padding: 1rem 0;
        border-top: 1px solid #ffffff50;
    }
}

@media screen and (max-width: 480px) {
    .hero h1 {
        font-size: 1.5rem;
    }

    .cta-button {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }
}

.course-list {
    padding: 2rem;
    text-align: center;
}

.course-card {
    background-color: #ffffff;
    border: 1px solid #007bff;
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}

.course-card h3 {
    color: #007bff;
    margin-bottom: 1rem;
}

.course-card p {
    margin-bottom: 1rem;
    color: #333;
}

.course-card .cta-button {
    background-color: #007bff;
    color: #fff;
    padding: 0.5rem 1rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease;
    margin-bottom: 1rem;
    display: inline-block;
}

.course-card .cta-button:hover {
    background-color: #0056b3;
}

.video-preview {
    margin-top: 1rem;
}

.video-preview video {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0px 4px 6px rgba(0, 0, 0, 0.1);
}