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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
}

/* Navigation */
nav {
    background-color: #2c3e50;
    padding: 10px;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
}

nav ul li {
    margin: 0 10px;
}

nav a {
    color: white;
    text-decoration: none;
    font-size: 18px;
}

/* Header Section (เพิ่ม Animation) */
header {
    text-align: center;
    background-color: #2980b9;
    color: white;
    padding: 40px 0;
    background-image: url('R.jpg');
    background-size: cover;
    background-position: center;
    height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    
    /* เริ่มต้นแบบโปร่งใสและอยู่ต่ำลงมา */
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

/* เมื่อเพิ่มคลาส .show-header จะแสดงตัวหนังสือแบบเลื่อนขึ้น */
header.show-header {
    opacity: 1;
    transform: translateY(0);
}

header h1 {
    font-size: 3em;
    margin-bottom: 10px;
    text-shadow: 0px 2px 4px black;
}

header p {
    font-size: 1.2em;
    text-shadow: 0px 2px 4px black;
}

/* Responsive Images */
.hero-image, .feature-image {
    width: 100%;
    max-width: 500px;
    height: auto;
    margin: 0 auto;
    border-radius: 10px;
}

/* Sections */
section {
    padding: 20px;
    margin: 20px;
    background-color: #fff;
    border-radius: 10px;
}

section h2 {
    font-size: 2em;
    margin-bottom: 10px;
}

section img {
    width: 100%;
    height: auto;
    margin-top: 15px;
    border-radius: 10px;
}

/* Footer */
footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 10px 0;
}

/* Form */
form input, form button {
    padding: 10px;
    margin: 10px 0;
    width: 100%;
    font-size: 1em;
}

form button {
    background-color: #2980b9;
    color: white;
    border: none;
    cursor: pointer;
}

form button:hover {
    background-color: #3498db;
}

/* Responsive Design */
@media (max-width: 1024px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    header {
        height: 350px;
        padding: 30px;
    }
    
    header h1 {
        font-size: 2.5em;
    }
    
    header p {
        font-size: 1.1em;
    }
    
    section {
        padding: 15px;
    }
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    header {
        height: 300px;
        padding: 20px;
    }
    
    header h1 {
        font-size: 2em;
    }
    
    header p {
        font-size: 1em;
    }
    
    section {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    header {
        height: 250px;
        padding: 15px;
    }
    
    header h1 {
        font-size: 1.8em;
    }
    
    header p {
        font-size: 0.9em;
    }
    
    nav ul {
        flex-direction: column;
        text-align: center;
    }
    
    section {
        padding: 8px;
    }
}