/* ==========================================
   MTU OER - Modern Design System
   ========================================== */

/* === CSS Variables & Design Tokens === */
:root {
    /* Color Palette - Close match to screenshots */
    --color-primary: #001a33;
    --color-primary-dark: #000c19;
    --color-primary-light: #4a6fa5;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-border: #e1e4e8;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-display: 'Inter', system-ui, -apple-system, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);

    /* Transitions */
    --transition-base: 0.2s ease;
}

body {
    font-family: var(--font-body);
    background-color: #f1f4f8;
    /* Light greyish background from screenshots */
    color: var(--color-text);
    line-height: 1.6;
}

/* === Typography === */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    margin-bottom: var(--spacing-sm);
}

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

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

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

/* === Layout Containers === */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* === Header & Navigation === */
.header {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    flex-direction: column;
}

.header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: white;
    text-decoration: none;
}

.logo img {
    height: 70px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    line-height: 1.1;
    text-transform: uppercase;
}

.logo-text span {
    display: block;
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 1px;
}

.nav-bar {
    background: white;
    width: 100%;
}

.nav-menu {
    display: flex;
    list-style: none;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

.nav-menu li a {
    color: #333;
    padding: var(--spacing-md) var(--spacing-lg);
    display: block;
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-base);
}

.nav-menu li a:hover,
.nav-menu li a.active {
    background: #003366;
    color: white;
}

/* === Dropdown Menu === */
.nav-menu li {
    position: relative;
}

.nav-menu .dropdown {
    position: relative;
}

.nav-menu .dropdown>a {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav-menu .dropdown-arrow {
    font-size: 0.7rem;
    transition: transform var(--transition-base);
}

.nav-menu .dropdown:hover .dropdown-arrow {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    min-width: 220px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-base);
    z-index: 1000;
    margin-top: var(--spacing-xs);
    border: 1px solid var(--color-border);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    transition: all var(--transition-fast);
    border-radius: 0;
}

.dropdown-menu a::after {
    display: none;
}

.dropdown-menu a:hover {
    background: var(--gradient-card);
    color: var(--color-primary);
    padding-left: calc(var(--spacing-md) + 0.5rem);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--color-text);
    margin: 5px 0;
    transition: var(--transition-base);
    border-radius: 2px;
}

/* === Hero Section === */
.hero {
    background: var(--gradient-hero);
    color: white;
    padding: var(--spacing-2xl) 0;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    color: white;
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.search-section {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin-top: var(--spacing-xl);
}

.search-box {
    max-width: 600px;
    margin: 0 auto;
    position: relative;
    display: flex;
}

.search-box input {
    flex: 1;
    padding: 1.25rem var(--spacing-lg);
    border: none;
    border-radius: 4px 0 0 4px;
    font-size: 1rem;
    box-shadow: none;
    background: white;
}

.search-box button {
    background: var(--color-accent);
    color: var(--color-primary);
    border: none;
    padding: 0 var(--spacing-lg);
    border-radius: 0 4px 4px 0;
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-box button:hover {
    background: white;
    transform: none;
}

/* === Quick Links === */
.quick-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.quick-link-btn {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-base);
    font-weight: 500;
}

.quick-link-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* === Resource Cards === */
/* === Resource Cards (Listing Style) === */
.resource-item {
    background: white;
    margin-bottom: var(--spacing-2xl);
    display: flex;
    padding: 0;
    gap: var(--spacing-lg);
    border: none;
    box-shadow: none;
}

.date-icon {
    min-width: 90px;
    height: 90px;
    display: flex;
    flex-direction: column;
    border-radius: 4px;
    overflow: hidden;
}

.date-icon .month {
    background: #001a33;
    color: white;
    height: 35%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
}

.date-icon .day {
    background: #4a6fa5;
    color: white;
    height: 65%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
}

.resource-content {
    flex: 1;
}

.resource-content h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
}

.resource-content h3 a {
    color: #4a6fa5;
    text-decoration: none;
}

.resource-content h3 a:hover {
    color: #001a33;
}

.resource-content p {
    color: #888;
    font-size: 0.85rem;
    margin-bottom: var(--spacing-md);
}

.share-buttons {
    display: flex;
    gap: 8px;
    margin-top: 0;
}

.share-btn {
    width: 32px;
    height: 32px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white !important;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.share-btn:hover {
    opacity: 0.8;
}

.share-btn.fb {
    background: #3b5998;
}

.share-btn.tw {
    background: #55acee;
}

.share-btn.mail {
    background: #777777;
}

.share-btn.plus {
    background: #2d89ef;
}

.resource-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-card);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.resource-card h3 {
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
}

.resource-card p {
    color: var(--color-text-light);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.resource-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    text-align: center;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    color: white;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

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

/* === Breadcrumb === */
.breadcrumb {
    background: #000c19;
    padding: var(--spacing-sm) 0;
    color: #999;
}

.breadcrumb-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    font-size: 0.85rem;
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: #999;
}

.breadcrumb-list li::after {
    content: '>';
    font-size: 0.75rem;
}

.breadcrumb-list li:last-child::after {
    display: none;
}

.breadcrumb-list a {
    color: #999;
}

.breadcrumb-list a:hover {
    color: white;
}

.breadcrumb-list li:last-child {
    color: #4a6fa5;
}

/* === Page Content Box === */
.page-content {
    background: white;
    max-width: 1200px;
    margin: var(--spacing-xl) auto;
    padding: var(--spacing-2xl);
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.main-title {
    font-size: 1.75rem;
    color: #333;
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.description-text {
    color: #666;
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
}

/* === Search Section (Home) === */
.search-container {
    margin-top: var(--spacing-2xl);
}

.search-container h2 {
    font-size: 1.35rem;
    color: #333;
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.search-input-wrapper {
    position: relative;
    max-width: 800px;
}

.search-input-wrapper input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.search-input-wrapper .search-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #ccc;
    font-size: 1.2rem;
}

/* === Download Detail Page === */
.download-detail {
    padding: var(--spacing-2xl) 0;
}

.detail-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    margin-bottom: var(--spacing-xl);
}

.detail-header {
    border-bottom: 2px solid var(--color-border);
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.detail-title {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-md);
}

.detail-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.stat-item {
    background: var(--gradient-card);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.download-btn {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.125rem;
    margin-top: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.description-section {
    background: var(--gradient-card);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
}

.share-buttons {
    display: flex;
    gap: 10px;
    margin-top: var(--spacing-md);
}

.share-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    color: white !important;
    font-weight: bold;
    font-size: 1.2rem;
    transition: opacity var(--transition-fast);
}

.share-btn:hover {
    opacity: 0.8;
}

.share-btn.fb {
    background: #3b5998;
}

.share-btn.tw {
    background: #1da1f2;
}

.share-btn.mail {
    background: #888;
}

.share-btn.plus {
    background: #007bff;
}

.share-btn.small {
    width: 30px;
    height: 30px;
    font-size: 0.8rem;
}

/* === Footer === */
.footer {
    background: var(--color-primary-dark);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-2xl);
}

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

.footer-section h3 {
    color: white;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: all var(--transition-base);
    display: inline-block;
}

.footer-links a:hover {
    color: white;
    transform: translateX(5px);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-link:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
}

/* === Animations === */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-10px);
    }
}

/* === Responsive Design === */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: block;
    }

    /* Mobile Dropdown Styles */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        background: var(--gradient-card);
        margin: var(--spacing-xs) 0;
        border: none;
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-base);
    }

    .dropdown.active .dropdown-menu {
        max-height: 500px;
    }

    .dropdown-menu a {
        padding-left: var(--spacing-lg);
        font-size: 0.9rem;
    }

    .nav-menu .dropdown-arrow {
        margin-left: auto;
    }

    .dropdown.active .dropdown-arrow {
        transform: rotate(180deg);
    }

    .resource-grid {
        grid-template-columns: 1fr;
    }

    .detail-stats {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

/* === Utility Classes === */
.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}