/* ========================================
   Research Council Website Styles
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #325c84;
    --color-primary-dark: #264561;
    --color-primary-light: #4a7ba8;
    --color-secondary: #e8e8e8;
    --color-text: #333333;
    --color-text-light: #666666;
    --color-white: #ffffff;
    --color-border: #dddddd;
    --color-accent: #d4a574;

    --font-primary: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --container-width: 1200px;
    --container-padding: 20px;

    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-secondary);
}

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

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

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

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ========================================
   Skip Link (Accessibility)
   ======================================== */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-white);
    padding: 10px 20px;
    z-index: 9999;
    border-radius: 0 0 4px 4px;
    font-weight: 600;
}

.skip-link:focus {
    top: 0;
}

/* ========================================
   Container
   ======================================== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ========================================
   Header
   ======================================== */
.site-header {
    background-color: var(--color-white);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-top {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: 20px 0;
}

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

.site-branding {
    flex: 1;
}

.site-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--color-white);
}

.site-tagline {
    font-size: 14px;
    opacity: 0.9;
    color: var(--color-white);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 20px;
}

.search-toggle {
    color: var(--color-white);
    padding: 8px;
    border-radius: 4px;
    transition: background var(--transition-fast);
}

.search-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.login-link {
    color: var(--color-white);
    font-weight: 600;
    padding: 8px 16px;
    border: 2px solid var(--color-white);
    border-radius: 4px;
    transition: all var(--transition-fast);
}

.login-link:hover {
    background: var(--color-white);
    color: var(--color-primary);
}

/* ========================================
   Navigation
   ======================================== */
.main-navigation {
    background-color: var(--color-primary);
    position: relative;
}

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

.nav-item {
    position: relative;
}

.nav-item.has-dropdown {
    display: flex;
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--color-white);
    padding: 15px 20px;
    font-weight: 600;
    font-size: 15px;
    transition: background var(--transition-fast);
}

.nav-link:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
}

.dropdown-icon {
    opacity: 0.8;
}

.dropdown-toggle {
    display: none;
    padding: 15px 10px;
    color: var(--color-white);
    border-left: 1px solid rgba(255, 255, 255, 0.2);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--color-white);
    min-width: 250px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 0 0 4px 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu,
.dropdown-menu.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 12px 20px;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-secondary);
    font-size: 14px;
    transition: all var(--transition-fast);
}

.dropdown-menu a:hover {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    padding-left: 25px;
}

.dropdown-menu li:last-child a {
    border-bottom: none;
}

/* ========================================
   Submenus (Multi-level Dropdowns)
   ======================================== */
.has-submenu {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
}

.submenu-parent {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.submenu-icon {
    opacity: 0.6;
    transition: transform var(--transition-fast);
}

.has-submenu:hover .submenu-icon,
.has-submenu:focus-within .submenu-icon {
    transform: rotate(-90deg);
}

.submenu-toggle {
    display: none;
    padding: 12px 15px;
    color: var(--color-text);
    border-left: 1px solid var(--color-secondary);
}

/* Submenu - positioned to the right */
.submenu {
    position: absolute;
    top: 0;
    left: 100%;
    background-color: var(--color-white);
    min-width: 220px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 0 4px 4px 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-10px);
    transition: all var(--transition-normal);
    z-index: 101;
}

/* Flip submenu if near right edge */
.has-submenu.near-right .submenu {
    left: auto;
    right: 100%;
    border-radius: 4px 0 4px 4px;
    transform: translateX(10px);
}

.has-submenu:hover .submenu,
.has-submenu:focus-within .submenu,
.submenu.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.submenu a {
    display: block;
    padding: 12px 20px;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-secondary);
    font-size: 14px;
    transition: all var(--transition-fast);
}

.submenu a:hover {
    background-color: var(--color-secondary);
    color: var(--color-primary);
    padding-left: 25px;
}

.submenu li:last-child a {
    border-bottom: none;
    border-radius: 0 0 4px 4px;
}

.submenu li:first-child a {
    border-radius: 0 4px 0 0;
}

.has-submenu.near-right .submenu li:first-child a {
    border-radius: 4px 0 0 0;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    color: var(--color-white);
    padding: 15px;
}

.hamburger {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--color-white);
    position: relative;
    transition: background var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 25px;
    height: 3px;
    background: var(--color-white);
    transition: all var(--transition-fast);
}

.hamburger::before {
    top: -8px;
}

.hamburger::after {
    bottom: -8px;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger {
    background: transparent;
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.mobile-menu-toggle[aria-expanded="true"] .hamburger::after {
    bottom: 0;
    transform: rotate(-45deg);
}

/* ========================================
   Search Overlay
   ======================================== */
.search-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.search-overlay.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    width: 90%;
    max-width: 600px;
    position: relative;
}

.search-close {
    position: absolute;
    top: -60px;
    right: 0;
    color: var(--color-white);
    font-size: 40px;
    line-height: 1;
    padding: 10px;
}

.search-form {
    display: flex;
    gap: 10px;
}

.search-input {
    flex: 1;
    padding: 15px 20px;
    font-size: 18px;
    border: none;
    border-radius: 4px;
    background: var(--color-white);
}

.search-submit {
    padding: 15px 30px;
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 600;
    border-radius: 4px;
    transition: background var(--transition-fast);
}

.search-submit:hover {
    background: var(--color-primary-dark);
}

/* ========================================
   Hero Banner
   ======================================== */
.hero-banner {
    position: relative;
}

.banner-image {
    position: relative;
    height: 400px;
    overflow: hidden;
}

.banner-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, rgba(50, 92, 132, 0.9), rgba(50, 92, 132, 0.6));
    display: flex;
    align-items: center;
}

.banner-overlay h2 {
    color: var(--color-white);
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.banner-overlay p {
    color: var(--color-white);
    font-size: 20px;
    opacity: 0.9;
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
    padding: 60px 0;
}

section {
    margin-bottom: 60px;
}

section:last-child {
    margin-bottom: 0;
}

section h2 {
    font-size: 28px;
    color: var(--color-primary);
    margin-bottom: 30px;
    text-align: center;
}

/* ========================================
   Vision & Mission
   ======================================== */
.section-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.vision, .mission {
    background: var(--color-white);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.vision h2, .mission h2 {
    text-align: left;
    font-size: 24px;
    margin-bottom: 15px;
}

.vision p, .mission p {
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ========================================
   Core Values
   ======================================== */
.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.value-card {
    background: var(--color-white);
    padding: 30px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.value-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.value-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    margin-bottom: 20px;
}

.value-card h3 {
    font-size: 20px;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.value-card p {
    color: var(--color-text-light);
    font-size: 14px;
    line-height: 1.6;
}

/* ========================================
   Global SaTA Congress Section
   ======================================== */
.congress-section {
    margin-top: 60px;
}

.congress-banner {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    padding: 60px 0;
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.congress-banner::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    transform: translate(50%, -50%);
}

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

.congress-badge {
    display: inline-block;
    background: var(--color-accent);
    color: var(--color-white);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
}

.congress-content h2 {
    color: var(--color-white);
    font-size: 42px;
    margin-bottom: 15px;
}

.congress-date {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 20px;
    opacity: 0.95;
}

.congress-description {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 30px;
    line-height: 1.6;
}

.congress-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 16px;
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
}

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

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

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

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

/* ========================================
   Featured Video
   ======================================== */
.featured-video h2 {
    margin-bottom: 30px;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto;
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* ========================================
   Blog Section
   ======================================== */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.blog-card {
    background: var(--color-white);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.blog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.blog-image {
    height: 200px;
    overflow: hidden;
}

.blog-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.blog-card:hover .blog-image img {
    transform: scale(1.05);
}

.blog-content {
    padding: 25px;
}

.blog-date {
    display: block;
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 10px;
}

.blog-content h3 {
    font-size: 18px;
    margin-bottom: 10px;
}

.blog-content h3 a {
    color: var(--color-text);
}

.blog-content h3 a:hover {
    color: var(--color-primary);
}

.blog-content p {
    color: var(--color-text-light);
    font-size: 14px;
    margin-bottom: 15px;
}

.read-more {
    font-weight: 600;
    font-size: 14px;
}

.read-more::after {
    content: ' →';
    transition: margin-left var(--transition-fast);
}

.read-more:hover::after {
    margin-left: 5px;
}

/* ========================================
   Journal Section
   ======================================== */
.journal-section {
    background: var(--color-white);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.articles-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.article-item {
    padding-bottom: 25px;
    border-bottom: 1px solid var(--color-border);
}

.article-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.article-item h3 {
    font-size: 18px;
    margin-bottom: 8px;
}

.article-item h3 a {
    color: var(--color-primary);
}

.article-item h3 a:hover {
    color: var(--color-primary-dark);
}

.article-meta {
    font-size: 13px;
    color: var(--color-text-light);
    margin-bottom: 10px;
}

.article-item p:last-child {
    color: var(--color-text-light);
    font-size: 14px;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--color-white);
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    line-height: 1.8;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

/* ========================================
   Scroll to Top Button
   ======================================== */
.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    z-index: 100;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 768px) {
    /* Header */
    .header-top .container {
        flex-wrap: wrap;
    }

    .site-title {
        font-size: 22px;
    }

    .site-tagline {
        font-size: 12px;
    }

    /* Mobile Navigation */
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        display: none;
        flex-direction: column;
        width: 100%;
        background: var(--color-primary);
    }

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

    .nav-item {
        flex-direction: column;
        width: 100%;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-item.has-dropdown {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .nav-link {
        flex: 1;
        padding: 15px;
    }

    .dropdown-toggle {
        display: block;
    }

    .dropdown-icon {
        display: none;
    }

    .dropdown-menu {
        position: static;
        width: 100%;
        transform: none;
        opacity: 1;
        visibility: visible;
        display: none;
        box-shadow: none;
        border-radius: 0;
        background: var(--color-primary-dark);
    }

    .dropdown-menu.active {
        display: block;
    }

    .dropdown-menu a {
        color: var(--color-white);
        padding-left: 30px;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .dropdown-menu a:hover {
        background: var(--color-primary);
        color: var(--color-white);
    }

    /* Mobile Submenus */
    .has-submenu {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .submenu-parent {
        flex: 1;
        padding: 15px 30px;
        color: var(--color-white);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .submenu-icon {
        display: none;
    }

    .submenu-toggle {
        display: block;
        color: var(--color-white);
        border-left: 1px solid rgba(255, 255, 255, 0.2);
        padding: 15px;
    }

    .submenu-toggle[aria-expanded="true"] svg {
        transform: rotate(180deg);
    }

    .submenu {
        position: static;
        width: 100%;
        transform: none;
        opacity: 1;
        visibility: visible;
        display: none;
        box-shadow: none;
        border-radius: 0;
        background: rgba(0, 0, 0, 0.2);
    }

    .submenu.active {
        display: block;
    }

    .submenu a {
        padding-left: 45px;
        color: var(--color-white);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .submenu a:hover {
        background: rgba(255, 255, 255, 0.1);
        color: var(--color-white);
        padding-left: 50px;
    }

    .submenu li:first-child a,
    .submenu li:last-child a {
        border-radius: 0;
    }

    /* Banner */
    .banner-image {
        height: 300px;
    }

    .banner-overlay h2 {
        font-size: 28px;
    }

    .banner-overlay p {
        font-size: 16px;
    }

    /* Sections */
    .section-grid {
        grid-template-columns: 1fr;
    }

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

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

    .journal-section {
        padding: 25px;
    }

    /* Congress Section Mobile */
    .congress-banner {
        padding: 40px 20px;
    }

    .congress-content h2 {
        font-size: 28px;
    }

    .congress-date {
        font-size: 20px;
    }

    .congress-description {
        font-size: 16px;
    }

    .congress-actions {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .site-title {
        font-size: 18px;
    }

    .banner-image {
        height: 250px;
    }

    .banner-overlay h2 {
        font-size: 24px;
    }

    section h2 {
        font-size: 24px;
    }
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
    .site-header,
    .hero-banner,
    .scroll-top,
    .search-overlay {
        display: none;
    }

    .main-content {
        padding: 0;
    }

    body {
        background: white;
    }
}