/* CSS Variables with Nordic Aurora Color Scheme */
:root {
    /* Primary Colors - Inspired by Northern Lights and Icelandic Nature */
    --color-primary: #005A6F;      /* Deep Teal - Main brand color */
    --color-secondary: #00838F;    /* Ocean Blue - Supporting color */
    --color-accent: #B2DFDB;       /* Mint - Light accent */
    --color-highlight: #FFB74D;    /* Aurora Gold - Call-to-action */
    
    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-light-gray: #F5F8FA;  /* Slightly blue-tinted for coolness */
    --color-medium-gray: #90A4AE;
    --color-dark-gray: #263238;    /* Charcoal - Better than pure black */
    
    /* Semantic Colors */
    --color-success: #4CAF50;
    --color-warning: #FF9800;
    --color-error: #F44336;
    --color-info: #03A9F4;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Georgia', serif; /* Optional: More distinctive headings */
    
    /* Spacing and Layout */
    --max-width: 1200px;
    --border-radius: 8px;
    --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --box-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
}

/* Alternative: Glacier Blue Scheme (Option 3) */
/* Uncomment this section if you prefer the Glacier Blue palette
:root {
    --color-primary: #2E5090;
    --color-secondary: #5E92F3;
    --color-accent: #E8F0FF;
    --color-highlight: #FF6B6B;
    --color-white: #FFFFFF;
    --color-light-gray: #F8F9FA;
    --color-medium-gray: #94A3B8;
    --color-dark-gray: #334155;
}
*/

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-dark-gray);
    background-color: var(--color-light-gray);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.site-header {
    background-color: var(--color-white);
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 1.5rem;
}

.logo img {
    height: 50px;
    margin-right: 12px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-dark-gray);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-menu a:hover {
    color: var(--color-primary);
}

/* Add subtle underline animation */
.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-highlight);
    transition: width 0.3s;
}

.nav-menu a:hover::after {
    width: 100%;
}

/* Language Switcher */
.language-switcher select {
    padding: 8px 12px;
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    background: var(--color-white);
    color: var(--color-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
}

.language-switcher select:hover {
    border-color: var(--color-primary);
    box-shadow: 0 2px 4px rgba(0, 90, 111, 0.1);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

/* Subtle pattern overlay */
.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 183, 77, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    position: relative;
    font-weight: 700;
}

.tagline {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    position: relative;
    opacity: 0.95;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    position: relative;
}

/* Button Styles */
.btn {
    display: inline-block;
    padding: 14px 32px;
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: all 0.3s;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-highlight);
    color: var(--color-dark-gray);
    box-shadow: 0 2px 4px rgba(255, 183, 77, 0.3);
}

.btn-primary:hover {
    background-color: #FFA726;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 183, 77, 0.4);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* Features Section */
.features {
    padding: 80px 0;
    background-color: var(--color-white);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    color: var(--color-primary);
    margin-bottom: 3rem;
}

.features h3 {
    color: var(--color-secondary);
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.features ul,
.features ol {
    margin-left: 0;
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.features p {
    margin-bottom: 1rem;
}

/* Course Cards */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.course-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    transition: all 0.3s;
    border: 1px solid rgba(0, 90, 111, 0.08);
}

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

.course-header {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    padding: 1.5rem;
    position: relative;
}

.course-card .course-header h3 {
    position: relative;
    z-index: 1;
    color: var(--color-accent) !important; /* var(--color-light-gray) */
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
    margin: 0;
    font-size: 1.25rem;
}

.course-card-content {
    padding: 2rem;
}

.course-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--color-medium-gray);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* Footer */
.site-footer {
    background-color: var(--color-dark-gray);
    color: var(--color-white);
    padding: 3rem 0 1rem;
    margin-top: 5rem;
}

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

.footer-section h3 {
    color: var(--color-accent);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: #B0BEC5;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--color-highlight);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #90A4AE;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--box-shadow);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .tagline {
        font-size: 1.2rem;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-primary: #003D4F;
        --color-highlight: #FF8F00;
        --box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --color-light-gray: #1A202C;
        --color-white: #2D3748;
        --color-dark-gray: #F7FAFC;
        --color-medium-gray: #A0AEC0;
    }
    
    .site-header {
        background-color: #2D3748;
    }
    
    .course-card {
        background: #2D3748;
        border-color: rgba(178, 223, 219, 0.1);
    }
    
    .language-switcher select {
        color: var(--color-accent);
        border-color: rgba(178, 223, 219, 0.3);
    }
}