:root {
    --theme-blue: #0077b6;
    --theme-green: #34a0a4;
    --theme-light: #f4f9fc;
    --theme-dark: #023047;
    --theme-accent: #ffd166;
}

/* Global Styles */
body {
    background-color: var(--theme-light); /* สีพื้นหลัง */
    font-family: 'Poppins', sans-serif;
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* Header */
header {
    background: linear-gradient(90deg, var(--theme-blue), var(--theme-green));
    color: white;
    text-align: center;
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--theme-accent);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

header .navbar-brand {
    font-size: 28px;
    font-weight: bold;
}

header .nav-link {
    color: white;
    font-weight: 600;
    margin: 0 10px;
    transition: color 0.3s ease;
}

header .nav-link:hover {
    color: var(--theme-accent);
}

/* Footer */
footer {
    background: linear-gradient(90deg, var(--theme-dark), var(--theme-blue));
    color: white;
    text-align: center;
    padding: 20px 10px;
    font-size: 14px;
    box-shadow: 0 -4px 8px rgba(0, 0, 0, 0.1);
}

footer a {
    color: var(--theme-accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: white;
}

/* Sections */
section {
    padding: 70px 20px;
    text-align: center;
    border-bottom: 1px solid #e0e0e0;
}

section.bg-light {
    background: linear-gradient(120deg, #eef7fc, #cce7f5);
}

h1, h2 {
    color: var(--theme-blue);
    font-size: 2rem;
    margin-bottom: 20px;
    text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.3);
}

p {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.1rem;
    color: #555;
    line-height: 1.8;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--theme-blue);
    color: white;
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 50px;
    text-decoration: none;
    transition: background-color 0.3s, transform 0.3s;
}

.btn:hover {
    background-color: var(--theme-green);
    transform: scale(1.05);
}

.btn-outline-primary {
    border: 2px solid var(--theme-blue);
    color: var(--theme-blue);
    border-radius: 50px;
    padding: 8px 20px;
    transition: background-color 0.3s, color 0.3s;
}

.btn-outline-primary:hover {
    background-color: var(--theme-blue);
    color: white;
}

/* Card Styles */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: scale(1.03);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

.card-img-top {
    height: 220px;
    object-fit: cover;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.card-title {
    font-size: 1.5rem;
    color: var(--theme-blue);
    margin-bottom: 15px;
}

.card-text {
    font-size: 1rem;
    color: #444;
    line-height: 1.5;
}

/* Carousel */
.carousel-inner img {
    height: 450px;
    object-fit: cover;
    border-radius: 12px;
}

/* Fun Facts Section */
#fun-facts {
    background-color: #f9fbfc;
    padding: 60px 20px;
}

#fun-facts h2 {
    font-size: 2.5rem;
    color: var(--theme-blue);
    margin-bottom: 20px;
    font-weight: bold;
}

#fun-facts .card {
    border: none;
    border-radius: 12px;
    transition: transform 0.3s, box-shadow 0.3s;
}

#fun-facts .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

#fun-facts .card-img-top {
    height: 200px;
    object-fit: cover;
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

/* Animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 1.5s ease-in-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Styles */
@media (max-width: 768px) {
    h1, h2 {
        font-size: 2rem;
    }

    p {
        font-size: 1rem;
    }

    .card-img-top {
        height: 180px;
    }

    #fun-facts .card {
        margin-bottom: 20px;
    }
}