/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Playfair+Display:wght@600;700&display=swap');
@import url('./variables.css');

/* Reset & Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: #ffffff;
    overflow-x: hidden;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

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

ul {
    list-style: none;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-main);
    /* Keeping clean sans-serif for modern look */
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 1rem;
    color: var(--dark-blue);
}

[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4,
[data-theme="dark"] h5,
[data-theme="dark"] h6 {
    color: var(--accent-cyan);
}

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

.section {
    padding: 90px 20px;
}

.text-center {
    text-align: center;
}

.text-white {
    color: #fff !important;
}

.bg-light {
    background-color: var(--light-bg);
}

.bg-white {
    background-color: #fff !important;
}

.relative-z2 {
    position: relative;
    z-index: 2;
}

.margin-left-0 {
    margin-left: 0 !important;
    margin-right: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 35px;
    border-radius: 4px;
    /* Slightly squarer for professional feel */
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.btn-primary {
    background-color: var(--primary-blue);
    color: #fff;
    box-shadow: 0 4px 6px rgba(0, 86, 179, 0.2);
}

.btn-primary:hover {
    background-color: var(--dark-blue);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 86, 179, 0.3);
}

.btn-secondary {
    background-color: transparent;
    border-color: #fff;
    color: #fff;
}

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

.btn-outline-white {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.6);
    color: #fff;
}

.btn-outline-white:hover {
    background: #fff;
    color: var(--dark-blue);
}

.btn-text {
    font-weight: 600;
    color: var(--primary-blue);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-text:hover {
    color: var(--dark-blue);
}

[data-theme="dark"] .btn-text {
    color: var(--accent-cyan);
}


/* Header & Navigation */
.main-header {
    background-color: #fff;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.04);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

[data-theme="dark"] .main-header {
    background-color: var(--dark-bg-card);
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary-blue);
    letter-spacing: -0.5px;
    text-transform: uppercase;
}

[data-theme="dark"] .logo {
    color: var(--accent-cyan);
}

.navbar {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-list {
    display: flex;
    gap: 35px;
}

.nav-link {
    font-weight: 500;
    color: var(--text-dark);
    font-size: 0.95rem;
    position: relative;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-link:hover {
    color: var(--primary-blue);
}

[data-theme="dark"] .nav-link:hover {
    color: var(--accent-cyan);
}

[data-theme="dark"] .nav-link {
    color: #e0e0e0;
}

.nav-cta {
    display: flex;
    align-items: center;
    gap: 20px;
}

#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-dark);
}

[data-theme="dark"] #theme-toggle {
    color: #fff;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-dark);
}

[data-theme="dark"] .mobile-menu-btn {
    color: #fff;
}

/* Hero Section */
.hero-section {
    position: relative;
    padding: 180px 0 200px;
    background-color: var(--dark-blue);
    background-image: url('../centre.webp');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    /* Parallax effect */
    color: #fff;
    overflow: hidden;
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* Deep blue overlay: Dark Navy -> Soft Blue */
    background: linear-gradient(135deg, rgba(0, 31, 63, 0.85) 0%, rgba(0, 86, 179, 0.75) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1rem;
    color: #ffffff !important;
    line-height: 1.1;
    font-weight: 800;
}

.date-highlight {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 3rem;
    display: block;
    letter-spacing: 1px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Intro Section */
.intro-section {
    padding-bottom: 60px;
}

.lead-text {
    font-size: 1.35rem;
    color: var(--dark-blue);
    font-weight: 400;
    max-width: 900px;
    margin: 0 auto;
    opacity: 0.9;
}

[data-theme="dark"] .lead-text {
    color: #e0e0e0;
}

/* Section Header Styles */
.section-title {
    font-size: 2.2rem;
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.title-underline {
    width: 80px;
    height: 4px;
    background-color: var(--accent-cyan);
    margin: 0 auto 30px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
}

/* About Section */
.about-text {
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.8;
}

[data-theme="dark"] .about-text {
    color: #ccc;
}

/* Mission & Vision Cards */
.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 40px;
}

.mv-card {
    background: #fff;
    padding: 50px 40px;
    border-radius: 6px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
    border-left: 5px solid var(--primary-blue);
    transition: transform var(--transition-fast);
}

[data-theme="dark"] .mv-card {
    background: var(--dark-bg-card);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.mv-card:hover {
    transform: translateY(-5px);
}

.mv-icon {
    font-size: 2rem;
    color: var(--primary-blue);
    margin-bottom: 1.5rem;
}

[data-theme="dark"] .mv-icon {
    color: var(--accent-cyan);
}

/* Publications Section */
.publications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 50px;
}

.pub-card {
    background: #fff;
    padding: 30px;
    border: 1px solid #eee;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

[data-theme="dark"] .pub-card {
    background: var(--dark-bg-card);
    border-color: #333;
}

.pub-card:hover {
    border-color: var(--primary-blue);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
}

.pub-meta {
    font-size: 0.85rem;
    color: #888;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.pub-title {
    font-size: 1.4rem;
    margin-bottom: 10px;
    line-height: 1.3;
}

.pub-summary {
    font-size: 1rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

/* Events Section */
.events-section {
    background-color: var(--dark-blue);
    background-image: radial-gradient(circle at 10% 20%, rgba(0, 168, 232, 0.1) 0%, transparent 20%);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.overlay-dark {
    background-color: rgba(0, 31, 63, 0.85);
    /* Dark blue overlay */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* Featured Event */
.featured-event {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 60px 40px;
    max-width: 800px;
    margin: 0 auto 60px;
    border-radius: 8px;
}

.event-label {
    background: var(--accent-cyan);
    color: var(--dark-blue);
    padding: 5px 12px;
    text-transform: uppercase;
    font-size: 0.8rem;
    font-weight: 700;
    border-radius: 3px;
    display: inline-block;
    margin-bottom: 20px;
}

.event-title {
    font-size: 2.5rem;
    color: #fff !important;
    margin-bottom: 10px;
}

.event-date {
    font-size: 1.3rem;
    opacity: 0.9;
    margin-bottom: 30px;
}

.event-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
}

/* Future Events List */
.future-events-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.event-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 25px;
    border-radius: 6px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    transition: background 0.3s;
}

.event-card:hover {
    background: rgba(255, 255, 255, 0.08);
}

.event-date-box {
    background: rgba(255, 255, 255, 0.1);
    padding: 10px;
    border-radius: 4px;
    text-align: center;
    min-width: 70px;
}

.event-date-box .month {
    display: block;
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
}

.event-date-box .year {
    display: block;
    font-size: 0.9rem;
    font-weight: 400;
}

.event-details h4 {
    color: #fff !important;
    font-size: 1.1rem;
    margin-bottom: 5px;
}

.event-location,
.event-time {
    font-size: 0.9rem;
    opacity: 0.7;
    margin-bottom: 3px;
}

.event-location i {
    margin-right: 5px;
    color: var(--accent-cyan);
}


/* Footer */
.main-footer {
    background-color: #002244;
    /* Deepest blue */
    color: #fff;
    padding: 80px 0 30px;
    position: relative;
    overflow: hidden;
}

/* World map watermark substitute */
.main-footer::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 600px;
    height: 300px;
    background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.03) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    color: #fff;
    margin-bottom: 20px;
}

.footer-brand p {
    opacity: 0.7;
    max-width: 320px;
}

.footer-nav h4,
.footer-contact h4 {
    font-size: 1.1rem;
    color: #fff;
    margin-bottom: 25px;
}

.footer-nav ul li {
    margin-bottom: 12px;
}

.footer-nav ul li a {
    opacity: 0.7;
    transition: 0.3s;
    font-size: 0.95rem;
}

.footer-nav ul li a:hover {
    opacity: 1;
    color: var(--accent-cyan);
}

.social-links-footer {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links-footer a {
    width: 36px;
    height: 36px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: 0.3s;
}

.social-links-footer a:hover {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    color: #000;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    font-size: 0.85rem;
    opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

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

    .navbar {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: #fff;
        flex-direction: column;
        padding: 30px;
        height: calc(100vh - 70px);
        transform: translateX(100%);
        transition: transform 0.3s ease;
    }

    .navbar.active {
        transform: translateX(0);
    }

    .nav-list {
        flex-direction: column;
        text-align: center;
        width: 100%;
        margin: 0;
        gap: 20px;
    }

    [data-theme="dark"] .navbar {
        background: var(--dark-bg-card);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .event-actions {
        flex-direction: column;
        gap: 10px;
    }
}

/* Animations from previous step */
.fade-in-section {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    will-change: opacity, visibility;
}

/* Revert to opacity 1 default just in case, but let's try to add the animation back if safe */
/* Actually, user didn't complain about animations, but let's make them robust */
@media (prefers-reduced-motion: no-preference) {
    .fade-in-section {
        opacity: 0;
        transform: translateY(30px);
    }

    .fade-in-section.is-visible {
        opacity: 1;
        transform: none;
    }
}