/* Base Styles & Variables */
:root {
    --primary-color: #004b87; /* Professional College Blue */
    --secondary-color: #fca311; /* Accent Gold */
    --text-dark: #333333;
    --text-light: #ffffff;
    --bg-light: #f8f9fa;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Prompt', sans-serif; /* Supports Thai and English beautifully */
}

body {
    color: var(--text-dark);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Header & Navigation */
header {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.logo h2 {
    font-size: 1.3rem;
    font-weight: 600;
}

nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

nav ul li a {
    font-weight: 400;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--secondary-color);
}

#langToggle {
    background-color: var(--text-light);
    color: var(--primary-color);
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}

#langToggle:hover {
    background-color: var(--secondary-color);
    color: var(--text-light);
}

/* Hero Section */
.hero {
    /* Uses an unplash placeholder image for the campus */
    background: url('https://images.unsplash.com/photo-1523050854058-8df90110c9f1?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') no-repeat center center/cover;
    height: 80vh;
    position: relative;
}

.hero-overlay {
    background-color: rgba(0, 75, 135, 0.7); /* Blue tint overlay for text readability */
    height: 100%;
    display: flex;
    align-items: center;
}

.hero-content {
    color: var(--text-light);
    text-align: center;
    max-width: 800px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 30px;
}

.btn {
    background-color: var(--secondary-color);
    color: var(--text-light);
    padding: 12px 30px;
    border-radius: 5px;
    font-size: 1.1rem;
    font-weight: 600;
    transition: background 0.3s;
}

.btn:hover {
    background-color: #e08b00;
}

/* General Sections */
.section {
    padding: 80px 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.underline {
    width: 80px;
    height: 4px;
    background-color: var(--secondary-color);
    margin: 10px auto 0;
}

/* About Grid */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.about-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

/* Cards Grid (Programs) */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background: var(--text-light);
    padding: 40px 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

.card:hover {
    transform: translateY(-10px);
}

.card-icon {
    font-size: 3rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

/* Footer */
footer {
    background-color: var(--text-dark);
    color: var(--text-light);
    padding: 50px 0 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 30px;
    margin-bottom: 30px;
}

.footer-info p {
    margin: 10px 0;
}

.footer-info i {
    margin-right: 10px;
    color: var(--secondary-color);
}

.footer-social a {
    font-size: 1.5rem;
    margin-right: 15px;
    transition: color 0.3s;
}

.footer-social a:hover {
    color: var(--secondary-color);
}

.footer-bottom {
    text-align: center;
    border-top: 1px solid #555;
    padding-top: 20px;
    font-size: 0.9rem;
}

/* Responsive Design */
@media(max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 15px;
    }
    nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    .about-grid {
        grid-template-columns: 1fr;
    }
    .hero-content h1 {
        font-size: 2rem;
    }
}