/* General Styles */
body {
    font-family: Arial, sans-serif;
    background: #000;
    color: #fff;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background: #333;
    padding: 1rem 0;
    text-align: center;
    z-index: 1000;
}

header nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    padding: 0;
    margin: 0;
}

header nav ul li {
    margin: 0 15px;
}

header nav ul li a {
    color: #82c4f8;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

header nav ul li a:hover {
    color: #f4a261;
}

header nav ul li a:visited {
    color: #b3daff;
}

/* Section Visibility */
section {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.5s ease, transform 0.5s ease;
    transform: translateY(20px);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

section.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* About Section */
#about .container {
    display: flex;
    gap: 20px;
    align-items: center;
    background: #111;
    border-radius: 10px;
    padding: 20px;
    max-width: 800px;
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.1);
    text-align: left;
}

#about img {
    width: 150px;
    height: auto;
    border-radius: 10px;
    margin-right: 20px;
}

/* Book Section */
#book .container {
    background: #111;
    border-radius: 10px;
    padding: 20px;
    max-width: 800px;
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.1);
    text-align: center;
}

/* Speaking Section */
#speaking .container {
    background: #111;
    border-radius: 10px;
    padding: 20px;
    max-width: 800px;
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.1);
    text-align: left;
}

#speaking ul {
    padding-left: 20px;
    list-style: disc;
}

/* Buttons */
button {
    background: linear-gradient(90deg, #f4a261, #e76f51);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 30px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(255, 255, 255, 0.3);
}

/* Links */
a {
    color: #82c4f8;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #f4a261;
}

a:visited {
    color: #b3daff;
}