body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #eef3f0;
    color: #333;
}

header {
    background: linear-gradient(135deg, #4f7c65, #6b8e7a);
    color: white;
    text-align: center;
    padding: 30px 15px;
}

header h1 {
    margin: 0;
    font-size: 36px;
}

header p {
    margin-top: 8px;
    font-size: 14px;
}

nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    background: #3b5d4c;
    padding: 12px;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 20px;
    background: rgba(255,255,255,0.1);
    transition: 0.3s;
    font-weight: bold;
}

nav a:hover {
    background: white;
    color: #3b5d4c;
    transform: translateY(-2px);
}

nav a.active {
    background: white;
    color: #3b5d4c;
}

main {
    max-width: 850px;
    margin: 25px auto;
    padding: 25px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

section {
    max-width: 850px;
    margin: 25px auto;
    padding: 25px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

h2 {
    color: #4f7c65;
    margin-top: 25px;
    border-left: 5px solid #4f7c65;
    padding-left: 10px;
}

strong {
    color: #4f7c65;
}


ul, ol {
    padding-left: 20px;
}

li {
    margin-bottom: 8px;
}


.video-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 25px;
    justify-content: center;
    margin-top: 25px;
}

.video-item {
    text-align: center;
}

.video-item p {
    margin-top: 8px;
    font-size: 14px;
    color: #4f7c65;
}

footer {
    text-align: center;
    padding: 18px;
    background: #4f7c65;
    color: white;
    margin-top: 30px;
    font-size: 14px;
}