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

body {
    font-family: 'Sarabun', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
}

/* Header */
.header {
    background: linear-gradient(135deg, #4a4a4a 0%, #2c2c2c 100%);
    color: white;
    padding: 1.5rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Navigation */
.navigation {
    background: #e0e0e0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-container a {
    display: block;
    padding: 1rem 2rem;
    color: #333;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border-bottom: 0px solid transparent;
}

.nav-container a:hover {
    background: #5a5a5a;
    color: white;
    border-bottom-color: #808080;
}

/* Hero Banner */
.hero-banner {
    width: 100%;
    max-width: 100%;
    margin: 0px auto;
    padding: 0 0px;
}

.hero-banner img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 0px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
    filter: grayscale(100%);
}

/* Content Section */
.content-section {
    max-width: 1200px;
    margin: 3rem auto;
    padding: 0 20px;
}

.welcome-text {
    text-align: center;
    margin-bottom: 2rem;
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

.welcome-text h2 {
    font-size: 2rem;
    color: #4a4a4a;
    margin-bottom: 1rem;
}

.welcome-text p {
    font-size: 1.1rem;
    color: #666;
}

/* Footer */
.footer {
    background: #2c2c2c;
    color: #ccc;
    padding: 0rem 0;
    margin-top: 0rem;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.2);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    text-align: center;
}

.footer-content h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #bbb;
}

.footer-content p {
    margin: 0.5rem 0;
    font-size: 1rem;
    color: #aaa;
}

.footer-content .website {
    color: #999;
    font-weight: 600;
    font-size: 1.1rem;
    margin-top: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .header .subtitle {
        font-size: 0.95rem;
    }

    .nav-container {
        flex-direction: column;
    }

    .nav-container a {
        border-bottom: 1px solid #ccc;
        border-left: none;
    }

    .welcome-text h2 {
        font-size: 1.5rem;
    }

    .hero-banner {
        padding: 10px;
    }

    .welcome-text {
        padding: 1.5rem;
    }
}