:root {
    --primary-color: #00d2ff;
    --secondary-color: #3a7bd5;
    --accent-color: #00ff88;
    --dark-bg: #0b0f19;
    --darker-bg: #05080f;
    --light-text: #f0f4f8;
    --gray-text: #a0aec0;
    --glass-bg: rgba(16, 25, 43, 0.6);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
}

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

a:hover {
    color: var(--accent-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
}

.dark-section {
    background-color: var(--darker-bg);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    text-align: center;
    color: var(--gray-text);
    margin-bottom: 3rem;
    font-size: 1.1rem;
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* Navbar */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    background: rgba(5, 8, 15, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--glass-border);
}

nav.scrolled {
    padding: 0.5rem 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    color: var(--light-text);
}

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

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

.nav-links a {
    color: var(--light-text);
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -4px;
    left: 0;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: var(--transition);
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: all 0.3s ease-in-out;
    background-color: var(--light-text);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('assets/hero-bg.png');
    background-size: cover;
    background-position: center;
    z-index: -2;
}

.hero-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(5,8,15,0.7) 0%, rgba(5,8,15,0.9) 100%);
    z-index: -1;
}

.hero-content {
    max-width: 900px;
    z-index: 1;
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.badges {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.badge {
    padding: 0.5rem 1rem;
    border-radius: 50px;
    background: rgba(0, 210, 255, 0.1);
    border: 1px solid rgba(0, 210, 255, 0.3);
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero h1 span {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero h2 {
    font-size: 2rem;
    color: var(--gray-text);
    margin-bottom: 2rem;
}

.hero-details {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 3rem;
    font-size: 1.2rem;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.btn {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
}

.primary-btn {
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    color: #fff;
    border: none;
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.4);
}

.primary-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 210, 255, 0.6);
    color: #fff;
}

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

.secondary-btn:hover {
    background: rgba(0, 210, 255, 0.1);
    transform: translateY(-3px);
}

.organized-by p {
    color: var(--gray-text);
    margin-bottom: 0.5rem;
}

.organized-by strong {
    color: var(--light-text);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.about-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.about-card p {
    margin-bottom: 1.5rem;
    color: var(--gray-text);
}

/* Topics Section */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.topic-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 12px;
    transition: var(--transition);
    display: flex;
    align-items: center;
}

.topic-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.topic-item::before {
    content: '❖';
    color: var(--accent-color);
    margin-right: 1rem;
    font-size: 1.2rem;
}

/* Dates & Fees */
.dates-fees-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.timeline {
    list-style: none;
    position: relative;
    padding-left: 1.5rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 2px;
    background: var(--glass-border);
}

.timeline li {
    margin-bottom: 2rem;
    position: relative;
}

.timeline li::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 5px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary-color);
    transform: translateX(-50%);
}

.timeline li.highlight::before {
    background: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
}

.timeline-date {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.highlight .timeline-date {
    color: var(--accent-color);
}

.timeline-content {
    color: var(--light-text);
}

.fees-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 2rem;
}

.fees-table th, .fees-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.fees-table th {
    color: var(--primary-color);
    font-weight: 600;
}

.publications {
    background: rgba(0, 255, 136, 0.05);
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    border-radius: 0 8px 8px 0;
}

.publications h4 {
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

/* Committee Section */
.committee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.committee-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
}

.committee-card:hover {
    border-color: var(--secondary-color);
    transform: translateY(-5px);
}

.committee-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.committee-card p {
    margin-bottom: 0.5rem;
    color: var(--gray-text);
}

.committee-card strong {
    color: var(--light-text);
}

/* Contact & Venue */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.contact-info h3, .venue-info h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.contact-info p, .venue-info p {
    margin-bottom: 1rem;
    color: var(--gray-text);
}

.coordinator-list {
    list-style: none;
    margin-top: 1rem;
}

.coordinator-list li {
    margin-bottom: 0.8rem;
    color: var(--gray-text);
    padding-left: 1.5rem;
    position: relative;
}

.coordinator-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.mt-4 {
    margin-top: 2rem;
    color: var(--light-text);
}

.map-placeholder {
    width: 100%;
    height: 250px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px dashed var(--glass-border);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-text);
    margin-top: 1.5rem;
}

/* Footer */
footer {
    background: #020408;
    padding: 4rem 2rem 2rem;
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer-logos h3 {
    font-size: 2rem;
    color: var(--light-text);
    margin-bottom: 1rem;
}

.footer-logos p {
    color: var(--gray-text);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.05);
    color: var(--gray-text);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 992px) {
    .hero h1 { font-size: 2.8rem; }
    .hero-details { flex-direction: column; gap: 1rem; }
    .about-grid, .dates-fees-container, .contact-container { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .hamburger { display: block; }
    .nav-links {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: var(--darker-bg);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.5);
        padding: 2rem 0;
    }
    .nav-links.active { left: 0; }
    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
    .hero h1 { font-size: 2.2rem; }
    .hero h2 { font-size: 1.5rem; }
    .hero-cta { flex-direction: column; }
}