:root {
    /* Color Palette - Premium & Academic */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f4f6f9;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #555555;
    --color-accent: #2c3e50;
    /* Deep Slate Blue */
    --color-accent-hover: #1abc9c;
    /* Teal Pop */
    --color-link: #2980b9;
    --color-border: #e1e4e8;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Outfit', sans-serif;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;

    /* UI */
    --radius-sm: 4px;
    --radius-md: 8px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --transition: 0.2s ease;
}

/* @media (prefers-color-scheme: dark) {
    :root {
        --color-bg-primary: #121212;
        --color-bg-secondary: #1e1e1e;
        --color-text-primary: #e0e0e0;
        --color-text-secondary: #b0b0b0;
        --color-accent: #ecf0f1;
        --color-accent-hover: #1abc9c;
        --color-link: #3498db;
        --color-border: #333;
    }
} */

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    line-height: 1.7;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    color: var(--color-accent);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-accent-hover);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

/* Header */
.site-header {
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--color-accent);
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-md);
    list-style: none;
}

.main-nav a {
    color: var(--color-text-primary);
    font-weight: 500;
}

.main-nav a:hover {
    color: var(--color-accent-hover);
}

/* Hero */
.hero {
    background: var(--color-bg-primary);
    padding: calc(var(--spacing-lg) * 1.5) 0 var(--spacing-lg);
    /* Increased top padding */
    text-align: center;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-md);
}

.hero h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-xs);
}

.hero-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-md);
    box-shadow: var(--shadow-md);
    max-height: 500px;
    object-fit: cover;
}

/* Content */
.content-wrapper {
    min-height: 60vh;
    padding-bottom: var(--spacing-lg);
}

.page-content,
.entry-content {
    background: var(--color-bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    max-width: 800px;
    margin: 0 auto;
}

.entry-content p {
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.site-footer {
    background: var(--color-accent);
    color: #fff;
    padding: var(--spacing-md) 0;
    text-align: center;
    font-size: 0.9rem;
    margin-top: auto;
}

.site-footer p {
    opacity: 0.8;
}

/* Utils */
.fade-in {
    animation: fadeIn 0.8s ease-out forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background: var(--color-accent-hover);
    color: #fff !important;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

/* Course Catalog */
.courses-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-sm);
}

.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.course-card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-accent-hover);
}

.course-card-header {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.course-prefix {
    font-family: var(--font-heading);
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-accent-hover);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.course-title {
    font-size: 1.25rem;
    color: var(--color-accent);
    margin: 0;
}

.course-meta {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
    margin-top: var(--spacing-sm);
}

.course-tag {
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 12px;
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    font-weight: 600;
    border: 1px solid var(--color-border);
}

.course-tag.program {
    background: #e3f2fd;
    color: #1565c0;
    border-color: #bbdefb;
}

.course-tag.term {
    background: #fdfae3;
    color: #f39c12;
    border-color: #fcf3bb;
}

.course-description {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
    flex-grow: 1;
}

.course-footer {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}