/* Base Styles */
:root {
    --primary-color: #3B5998;
    --primary-light: #8b9dc3;
    --primary-dark: #293e69;
    --accent-color: #FFD700;
    --accent-dark: #d4b106;
    --success-color: #28a745;
    --warning-color: #ffc107;
    --error-color: #dc3545;
    --neutral-100: #ffffff;
    --neutral-200: #f8f9fa;
    --neutral-300: #e9ecef;
    --neutral-400: #ced4da;
    --neutral-500: #adb5bd;
    --neutral-600: #6c757d;
    --neutral-700: #495057;
    --neutral-800: #343a40;
    --neutral-900: #212529;
    
    --font-heading: 'Roboto', sans-serif;
    --font-body: 'Open Sans', sans-serif;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
    
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: var(--neutral-800);
    background-color: var(--neutral-200);
}

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

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

a:hover {
    color: var(--primary-dark);
}

ul {
    list-style: none;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--neutral-900);
}

p {
    margin-bottom: var(--spacing-md);
}

/* Layout */
.wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

main {
    flex: 1;
}

/* Header */
.header {
    background-color: var(--neutral-100);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo a {
    display: flex;
    align-items: center;
    color: var(--neutral-900);
}

.logo h1 {
    margin: 0;
    font-size: 1.8rem;
}

.logo span {
    color: var(--primary-color);
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    color: var(--neutral-700);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
    transition: all var(--transition-speed);
}

.nav-links a:hover {
    color: var(--primary-color);
    background-color: var(--neutral-200);
}

.nav-links a.active {
    color: var(--primary-color);
    background-color: rgba(59, 89, 152, 0.1);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--neutral-700);
    cursor: pointer;
}

/* Hero Section */
.hero {
    background-color: var(--primary-color);
    color: var(--neutral-100);
    padding: var(--spacing-xxl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('https://images.pexels.com/photos/267885/pexels-photo-267885.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=750&w=1260');
    background-size: cover;
    background-position: center;
    opacity: 0.15;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) 0;
}

.hero h2 {
    font-size: 2.5rem;
    color: var(--neutral-100);
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    font-family: var(--font-body);
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all var(--transition-speed);
    border: none;
    font-size: 1rem;
    line-height: 1.5;
}

.btn-primary {
    background-color: var(--accent-color);
    color: var(--neutral-900);
}

.btn-primary:hover {
    background-color: var(--accent-dark);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--neutral-100);
    border: 2px solid var(--neutral-100);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--neutral-100);
}

/* Features Section */
.features {
    padding: var(--spacing-xxl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-size: 2rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background-color: var(--primary-color);
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background-color: var(--neutral-100);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-speed);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.feature-card h3 {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-sm);
}

/* Universities Section */
.universities {
    padding: var(--spacing-xxl) 0;
    background-color: var(--neutral-100);
}

.university-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.university-card {
    background-color: var(--neutral-200);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-speed);
    display: block;
    color: var(--neutral-800);
}

.university-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    background-color: var(--primary-light);
    color: var(--neutral-100);
}

.university-card h3 {
    margin-bottom: var(--spacing-xs);
    color: inherit;
}

.university-card p {
    margin-bottom: 0;
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Page Header */
.page-header {
    background-color: var(--primary-color);
    color: var(--neutral-100);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.page-header h2 {
    color: var(--neutral-100);
    margin-bottom: var(--spacing-sm);
}

/* Footer */
.footer {
    background-color: var(--neutral-800);
    color: var(--neutral-300);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo h2 {
    color: var(--neutral-100);
    margin-bottom: var(--spacing-sm);
}

.footer-logo span {
    color: var(--accent-color);
}

.footer-logo p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer h3 {
    color: var(--neutral-100);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.footer ul li {
    margin-bottom: var(--spacing-sm);
}

.footer a {
    color: var(--neutral-400);
    transition: color var(--transition-speed);
}

.footer a:hover {
    color: var(--neutral-100);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--neutral-700);
    font-size: 0.9rem;
    opacity: 0.7;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    .nav-links {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background-color: var(--neutral-100);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        transition: all var(--transition-speed);
        pointer-events: none;
    }

    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-links a {
        display: block;
        padding: var(--spacing-md);
    }

    .hero h2 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .feature-card, .university-card {
        transform: none !important;
    }
}

@media screen and (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .header .container {
        height: 60px;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .nav-links {
        top: 60px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    .hero-content {
        padding: var(--spacing-lg) 0;
    }

    .hero h2 {
        font-size: 1.8rem;
    }
}