:root {
    --primary-color: #03136ff7;
    --secondary-color: #0b1a5e;
    /* Darker shade */
    --accent-color: #ffffff;
    --text-color: #333333;
    --light-bg: #f5f7fa;
    --font-main: 'Inter', sans-serif;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--accent-color);
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utilities */
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--accent-color);
    border-radius: 5px;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid var(--primary-color);
}

.btn:hover {
    background-color: transparent;
    color: var(--primary-color);
}

.section-padding {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
    color: var(--secondary-color);
}

/* Header & Nav */
header {
    background-color: var(--accent-color);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo img {
    height: 60px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

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

.nav-links li a:hover,
.nav-links li a.active {
    color: var(--primary-color);
}

.menu-toggle {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(3, 19, 111, 0.9), rgba(3, 19, 111, 0.7)), url('../images/hero-bg.jpg') no-repeat center center/cover;
    height: 80vh;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    text-align: center;
    position: relative;
    /* Fallback if image missing */
    background-color: var(--primary-color);
    /* Fallback */
}

.hero-content h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn-light {
    background-color: var(--accent-color);
    color: var(--primary-color);
    border-color: var(--accent-color);
}

.btn-light:hover {
    background-color: transparent;
    color: var(--accent-color);
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: var(--accent-color);
    padding: 3rem 0;
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-bottom {
    text-align: center;
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links {
        position: absolute;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--accent-color);
        flex-direction: column;
        align-items: center;
        padding: 2rem 0;
        transform: translateY(-150%);
        transition: transform 0.3s ease-in-out;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        transform: translateY(0);
    }

    .menu-toggle {
        display: block;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }
}

/* Course Detail Page Responsive */
.course-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
}

.course-banner {
    width: 100%;
    height: 300px;
    /* Fixed height as requested */
    object-fit: cover;
    /* Maintain aspect ratio */
    border-radius: 8px;
    margin-bottom: 2rem;
}

@media (max-width: 992px) {
    .course-layout {
        grid-template-columns: 1fr;
        /* Stack on smaller screens */
        gap: 2rem;
    }
}

/* Generic Responsive Grids */
.auto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.split-layout {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    align-items: center;
}

@media (max-width: 768px) {

    .auto-grid,
    .split-layout {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .section-title {
        font-size: 2rem;
    }
}

.grid-2-cols {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

@media (max-width: 768px) {
    .grid-2-cols {
        grid-template-columns: 1fr;
    }
}

.grid-4-cols {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

@media (max-width: 992px) {
    .grid-4-cols {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .grid-4-cols {
        grid-template-columns: 1fr;
    }
}

/* Course Content List (Compact) */
.course-list {
    list-style: none;
}

.course-list li {
    background: #f9f9f9;
    padding: 0.75rem 1rem;
    /* Reduced from 1rem */
    margin-bottom: 0.25rem;
    /* Reduced from 0.5rem */
    border-left: 4px solid var(--primary-color);
    font-size: 0.95rem;
}

@media (max-width: 600px) {
    .course-list li {
        font-size: 0.9rem;
    }
}

/* Program Page Specifics */
.program-category {
    margin-bottom: 4rem;
}

.program-category h2 {
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    margin-bottom: 2rem;
    padding-bottom: 0.5rem;
    color: var(--secondary-color);
}

.program-card {
    background: white;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.program-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.program-card h3 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.program-card p {
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.program-card .btn-sm {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--light-bg);
    color: var(--primary-color);
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 600;
}

.program-card .btn-sm:hover {
    background-color: var(--primary-color);
    color: white;
}

.program-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 1rem;
}