/* ================================
   WSeS-11 Conference Website Styles
   ================================ */

/* ========== CSS Variables ========== */
:root {
    /* Primary Colors - Chemical Blue Theme */
    --primary-color: #1e5a8e;
    --primary-dark: #153f68;
    --primary-light: #2d7ab8;
    
    /* Secondary Colors */
    --secondary-color: #4a9d5f;
    --accent-color: #ff9800;
    
    /* Neutral Colors */
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #dee2e6;
    
    /* Semantic Colors */
    --success: #28a745;
    --warning: #ffc107;
    --danger: #dc3545;
    --info: #17a2b8;
    
    /* Typography */
    --font-primary: 'Roboto', sans-serif;
    --font-heading: 'Merriweather', serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.15);
    
    /* Transitions */
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* ========== Typography ========== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

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

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

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

.navbar {
    padding: var(--spacing-sm) 0;
}

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

.logo {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-color);
    transition: var(--transition);
}

.logo:hover {
    color: #ffa726;
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    align-items: center;
}

.nav-menu a {
    padding: var(--spacing-xs) 0.75rem;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.9rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
    background-color: var(--primary-color);
    color: var(--bg-white);
}

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

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--text-dark);
    margin: 3px 0;
    transition: var(--transition);
}

/* ========== Hero Section ========== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Fallback gradient */
    background: linear-gradient(135deg, #f4a460 0%, #87ceeb 100%);
    color: var(--bg-white);
    text-align: center;
    overflow: hidden;
}

.hero-background-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(255, 152, 0, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 70%, rgba(74, 157, 95, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.03) 0%, transparent 70%);
    animation: backgroundPulse 20s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 50px,
            rgba(255, 255, 255, 0.03) 50px,
            rgba(255, 255, 255, 0.03) 51px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 50px,
            rgba(255, 255, 255, 0.03) 50px,
            rgba(255, 255, 255, 0.03) 51px
        );
    opacity: 0.3;
}

@keyframes backgroundPulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.8;
    }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.5) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 900px;
    padding: var(--spacing-md);
}

.hero-content::before {
    content: '';
    position: absolute;
    top: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 150px;
    background: radial-gradient(circle, rgba(255, 152, 0, 0.2), transparent);
    border-radius: 50%;
    animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: translateX(-50%) scale(1);
        opacity: 0.5;
    }
    50% {
        transform: translateX(-50%) scale(1.2);
        opacity: 0.8;
    }
}

.hero-title {
    font-size: 4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-shadow: 
        0 2px 10px rgba(0,0,0,0.3),
        0 0 40px rgba(255, 152, 0, 0.3),
        0 0 80px rgba(255, 152, 0, 0.2);
    animation: fadeInUp 1s ease;
    letter-spacing: 0.05em;
    color: #ffffff;
}

.hero-subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s both;
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.1rem;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--accent-color);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.6s both;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    font-size: 2rem;
    color: var(--bg-white);
    opacity: 0.7;
    animation: bounce 2s infinite;
    z-index: 2;
}

/* ========== Buttons ========== */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: #e68900;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

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

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* ========== Welcome Section ========== */
.welcome-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-white);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.welcome-content {
    max-width: 900px;
    margin: 0 auto;
}

.lead {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-light);
    margin-bottom: var(--spacing-md);
}

.announcement-box {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    margin: var(--spacing-lg) 0;
    box-shadow: var(--shadow-lg);
}

.announcement-box h3 {
    color: var(--bg-white);
    margin-bottom: var(--spacing-sm);
    font-size: 1.8rem;
}

.description p {
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
    line-height: 1.8;
}

.highlight-box {
    background-color: var(--secondary-color);
    color: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    margin: var(--spacing-lg) 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.highlight-box i {
    font-size: 2rem;
}

.highlight-box h4 {
    color: var(--bg-white);
    margin: 0;
    font-size: 1.5rem;
}

.closing-text {
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
}

.see-you {
    text-align: center;
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-top: var(--spacing-lg);
}

/* ========== Key Info Section ========== */
.key-info-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.key-info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.info-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.info-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.info-icon i {
    font-size: 2rem;
    color: var(--bg-white);
}

.info-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.info-card ul {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.info-card ul li {
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
}

.info-card ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-color);
    font-weight: 500;
    transition: var(--transition);
}

.card-link:hover {
    gap: 0.75rem;
}

/* ========== Committee Section ========== */
.committee-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-white);
}

.committee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.committee-card {
    background-color: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    border-left: 4px solid var(--primary-color);
}

.committee-card h4 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.committee-card .name {
    font-weight: 700;
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
}

.committee-card .affiliation {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ========== CTA Section ========== */
.cta-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: var(--bg-white);
    text-align: center;
}

.cta-section h2 {
    color: var(--bg-white);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ========== Footer ========== */
.footer {
    background-color: var(--text-dark);
    color: var(--bg-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-col h4 {
    color: var(--bg-white);
    margin-bottom: var(--spacing-sm);
    font-size: 1.2rem;
}

.footer-col p {
    opacity: 0.8;
    line-height: 1.8;
}

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

.footer-col ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-col a {
    color: rgba(255,255,255,0.8);
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--bg-white);
    padding-left: 5px;
}

.footer-col i {
    margin-right: var(--spacing-xs);
    color: var(--accent-color);
}

.footer-date {
    color: var(--accent-color);
    font-weight: 500;
}

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

.social-links a {
    width: 40px;
    height: 40px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-md);
    text-align: center;
    opacity: 0.7;
}

/* ========== Animations ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

/* ========== Responsive Design ========== */
@media (max-width: 992px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--bg-white);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu a {
        font-size: 1rem;
        padding: var(--spacing-sm);
        width: 100%;
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.25rem;
    }
    
    .hero-info {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
    }
    
    .key-info-grid,
    .committee-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-header h2 {
        font-size: 1.8rem;
    }
    
    .announcement-box {
        padding: var(--spacing-md);
    }
    
    .announcement-box h3 {
        font-size: 1.3rem;
    }
}

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

.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); }

.pt-1 { padding-top: var(--spacing-sm); }
.pt-2 { padding-top: var(--spacing-md); }
.pt-3 { padding-top: var(--spacing-lg); }

.pb-1 { padding-bottom: var(--spacing-sm); }
.pb-2 { padding-bottom: var(--spacing-md); }
.pb-3 { padding-bottom: var(--spacing-lg); }

/* ========== Page Header ========== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
}

.page-header h1 {
    color: var(--bg-white);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.95;
}

/* ========== News Section ========== */
.news-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.news-section .container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-lg);
}

.news-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.news-item {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-md);
    transition: var(--transition);
}

.news-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.news-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm);
    min-width: 80px;
    height: fit-content;
}

.date-day {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.date-month {
    font-size: 0.9rem;
    text-transform: uppercase;
    font-weight: 500;
}

.date-year {
    font-size: 0.8rem;
    opacity: 0.8;
}

.news-content {
    flex: 1;
}

.news-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.news-badge.new {
    background-color: var(--success);
    color: var(--bg-white);
}

.news-badge.important {
    background-color: var(--danger);
    color: var(--bg-white);
}

.news-badge.announcement {
    background-color: var(--info);
    color: var(--bg-white);
}

.news-content h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.news-meta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
    font-size: 0.9rem;
    color: var(--text-light);
    margin-top: var(--spacing-sm);
}

.news-meta span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    color: var(--primary-color);
    font-weight: 500;
    margin-top: var(--spacing-sm);
    transition: var(--transition);
}

.news-link:hover {
    gap: 0.5rem;
}

/* News Sidebar */
.news-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.sidebar-card h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.dates-list {
    list-style: none;
}

.dates-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.dates-list li:last-child {
    border-bottom: none;
}

.dates-list strong {
    display: block;
    color: var(--text-dark);
    margin-bottom: 0.25rem;
}

.dates-list span {
    color: var(--text-light);
    font-size: 0.9rem;
}

.quick-actions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.action-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background-color: var(--bg-light);
    color: var(--primary-color);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: var(--transition);
}

.action-btn:hover {
    background-color: var(--primary-color);
    color: var(--bg-white);
    transform: translateX(5px);
}

.newsletter-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.newsletter-form input {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
}

.newsletter-form button {
    width: 100%;
}

/* Responsive - News Page */
@media (max-width: 992px) {
    .news-section .container {
        grid-template-columns: 1fr;
    }
    
    .news-sidebar {
        order: -1;
    }
}

@media (max-width: 768px) {
    .news-item {
        flex-direction: column;
    }
    
    .news-date {
        flex-direction: row;
        width: 100%;
        justify-content: flex-start;
        gap: var(--spacing-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .date-day {
        font-size: 1.5rem;
    }
}

/* ========== About Page Styles ========== */
.about-section {
    padding: var(--spacing-xl) 0;
}

.about-intro {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.about-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.about-card .card-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.about-card .card-icon i {
    font-size: 2.5rem;
    color: var(--bg-white);
}

.topics-section,
.format-section,
.why-attend-section,
.history-section {
    margin: var(--spacing-xl) 0;
}

.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.topic-card {
    background-color: var(--bg-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    border-top: 4px solid var(--primary-color);
}

.topic-icon {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.topic-card ul {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.topic-card ul li {
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.topic-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.format-item {
    text-align: center;
    padding: var(--spacing-md);
}

.format-icon {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.benefit-item {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
}

.benefit-item i {
    font-size: 1.5rem;
    color: var(--success);
    flex-shrink: 0;
}

.about-cta {
    text-align: center;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-white));
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
}

/* ========== Program Page Styles ========== */
.program-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.program-intro {
    margin-bottom: var(--spacing-xl);
}

.day-schedule {
    margin-bottom: var(--spacing-xl);
}

.day-header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
}

.day-header h2 {
    color: var(--bg-white);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin: 0;
}

.schedule-timeline {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.schedule-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-left: 4px solid var(--border-color);
    margin-bottom: var(--spacing-sm);
}

.schedule-item.keynote { border-left-color: var(--accent-color); background-color: rgba(255, 152, 0, 0.05); }
.schedule-item.session { border-left-color: var(--primary-color); }
.schedule-item.poster { border-left-color: var(--secondary-color); background-color: rgba(74, 157, 95, 0.05); }
.schedule-item.break { border-left-color: var(--text-light); background-color: var(--bg-light); }
.schedule-item.lunch { border-left-color: var(--info); background-color: rgba(23, 162, 184, 0.05); }
.schedule-item.social { border-left-color: var(--warning); background-color: rgba(255, 193, 7, 0.05); }
.schedule-item.registration { border-left-color: var(--success); background-color: rgba(40, 167, 69, 0.05); }
.schedule-item.opening { border-left-color: var(--danger); background-color: rgba(220, 53, 69, 0.05); }
.schedule-item.closing { border-left-color: var(--danger); background-color: rgba(220, 53, 69, 0.05); }

.schedule-item .time {
    font-weight: 700;
    color: var(--primary-color);
    min-width: 120px;
    flex-shrink: 0;
}

.schedule-item .content {
    flex: 1;
}

.schedule-item .content ul {
    margin-top: var(--spacing-xs);
    margin-left: var(--spacing-md);
}

.program-notes,
.download-section {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-top: var(--spacing-lg);
}

.download-buttons {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

/* ========== Speakers Page Styles ========== */
.speakers-section {
    padding: var(--spacing-xl) 0;
}

.speakers-intro {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.speaker-category {
    margin-bottom: var(--spacing-xl);
}

.speaker-category h2 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.speaker-card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
}

.speaker-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.speaker-photo {
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--bg-light), var(--border-color));
}

.photo-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.photo-placeholder i {
    font-size: 5rem;
    color: var(--text-light);
}

.speaker-info {
    padding: var(--spacing-md);
}

.speaker-info h3 {
    color: var(--primary-color);
    margin-bottom: 0.25rem;
}

.affiliation {
    color: var(--text-light);
    font-style: italic;
    margin-bottom: 0.25rem;
}

.country {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.speaker-expertise {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: var(--spacing-sm) 0;
}

.tag {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.call-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.call-box {
    background-color: var(--bg-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

/* ========== Form Styles ========== */
.registration-section,
.abstract-section,
.contact-section {
    padding: var(--spacing-xl) 0;
    background-color: var(--bg-light);
}

.registration-intro,
.abstract-intro,
.contact-intro {
    margin-bottom: var(--spacing-lg);
}

.highlight-banner {
    background: linear-gradient(135deg, var(--success), var(--secondary-color));
    color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.highlight-banner i {
    font-size: 3rem;
}

.highlight-banner h3 {
    color: var(--bg-white);
    margin: 0;
}

.registration-content,
.abstract-content,
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-lg);
}

.registration-info,
.abstract-info,
.contact-info-section {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.info-box {
    background-color: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.info-box h3 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.info-box ul {
    list-style: none;
}

.info-box ul li {
    padding: 0.25rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.info-box ul li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.warning-box {
    border-left: 4px solid var(--warning);
}

.presentation-types {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

.type-card {
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
}

.registration-form-section,
.abstract-form-section,
.contact-form-section {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.reg-form,
.abstract-form,
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(30, 90, 142, 0.1);
}

.form-group small {
    margin-top: 0.25rem;
    color: var(--text-light);
    font-size: 0.85rem;
}

.checkbox-group,
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-group label,
.radio-group label,
.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: normal;
    cursor: pointer;
}

.checkbox-group input,
.radio-group input,
.checkbox-label input {
    cursor: pointer;
}

.form-divider {
    border: none;
    border-top: 2px solid var(--border-color);
    margin: var(--spacing-md) 0;
}

.form-note {
    color: var(--text-light);
    font-size: 0.9rem;
    text-align: center;
    margin-top: var(--spacing-sm);
}

.char-count {
    text-align: right;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 0.25rem;
}

.help-section {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    text-align: center;
}

.form-success {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--success);
    color: var(--bg-white);
    border-radius: var(--radius-lg);
}

.form-success i {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

/* ========== Venue Page Styles ========== */
.venue-section {
    padding: var(--spacing-xl) 0;
}

.venue-main {
    margin-bottom: var(--spacing-xl);
}

.venue-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.venue-address {
    margin: var(--spacing-sm) 0;
}

.venue-details h4 {
    color: var(--primary-color);
    margin-top: var(--spacing-md);
}

.venue-map {
    display: flex;
    align-items: center;
    justify-content: center;
}

.map-placeholder {
    width: 100%;
    height: 400px;
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
}

.map-placeholder i {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.travel-section,
.accommodation-section,
.local-info-section {
    margin: var(--spacing-xl) 0;
}

.travel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.travel-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.travel-icon {
    font-size: 3rem;
    color: var(--primary-color);
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.hotel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.hotel-card {
    background-color: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
}

.hotel-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
}

.hotel-badge.recommended {
    background-color: var(--accent-color);
}

.hotel-location {
    color: var(--text-light);
    margin: var(--spacing-sm) 0;
}

.hotel-features {
    list-style: none;
    margin: var(--spacing-sm) 0;
}

.hotel-features li {
    padding: 0.25rem 0;
}

.hotel-features i {
    color: var(--secondary-color);
    margin-right: 0.5rem;
}

.hotel-price {
    margin: var(--spacing-sm) 0;
    padding: var(--spacing-sm);
    background-color: var(--bg-light);
    border-radius: var(--radius-sm);
    text-align: center;
}

.hotel-distance {
    color: var(--text-light);
    font-size: 0.9rem;
    text-align: center;
}

.accommodation-note {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-md);
    border-left: 4px solid var(--warning);
}

.local-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.local-card {
    background-color: var(--bg-white);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    text-align: center;
}

.local-card h4 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

/* ========== Contact Page Styles ========== */
.contact-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.contact-card {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.contact-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.contact-icon i {
    font-size: 2rem;
    color: var(--bg-white);
}

.response-time {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: var(--spacing-xs);
}

.committee-contact {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.committee-members {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.member-card {
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
    text-align: center;
}

.member-name {
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.member-affiliation {
    color: var(--text-light);
    font-size: 0.9rem;
}

.faq-section {
    background-color: var(--bg-white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    padding: var(--spacing-md);
    background-color: var(--bg-light);
    border-radius: var(--radius-md);
}

.faq-item h4 {
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: 0.5rem;
}

.social-section {
    text-align: center;
    margin-top: var(--spacing-xl);
}

.social-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
    flex-wrap: wrap;
}

.social-btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    color: var(--bg-white);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: var(--transition);
}

.social-btn.twitter { background-color: #1DA1F2; }
.social-btn.facebook { background-color: #4267B2; }
.social-btn.linkedin { background-color: #0077B5; }

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* ========== Alert Messages ========== */
.alert {
    position: fixed;
    top: 100px;
    right: 20px;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--bg-white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    z-index: 9999;
    opacity: 0;
    transform: translateY(-20px);
    transition: var(--transition);
    max-width: 400px;
}

.alert-success {
    border-left: 4px solid var(--success);
}

.alert-success i {
    color: var(--success);
    font-size: 1.5rem;
}

.alert-error {
    border-left: 4px solid var(--danger);
}

.alert-error i {
    color: var(--danger);
    font-size: 1.5rem;
}

/* ========== Scroll to Top Button ========== */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    transform: translateY(-5px);
}

/* ========== Responsive Adjustments ========== */
@media (max-width: 992px) {
    .registration-content,
    .abstract-content,
    .contact-content,
    .venue-card {
        grid-template-columns: 1fr;
    }
    
    .presentation-types {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .schedule-item {
        flex-direction: column;
    }
    
    .schedule-item .time {
        min-width: auto;
    }
    
    .social-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .alert {
        right: 10px;
        left: 10px;
        max-width: none;
    }
}