/* ACM Winter School 2025 - Custom Styles */

html {
    scroll-behavior: smooth;
}

/* Hamburger Menu Styles */
.hamburger {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 3px 0;
    transition: all 0.3s ease;
    border-radius: 2px;
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Navigation Links */
.nav-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.nav-links li {
    list-style: none;
}

.nav-links a {
    color: var(--dark-gray);
    text-decoration: none;
    font-weight: 500;
    border-radius: 6px;
    transition: all var(--transition-speed) ease;
    position: relative;
}

.nav-links a:before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transform: translateX(-50%);
    transition: width var(--transition-speed) ease;
}

.nav-links a.active {
    color: var(--accent-color);
}

.nav-links a.active:before {
    width: 80%;
}

/* Keynote Section */
.keynote-section {
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.05) 0%, rgba(207, 102, 121, 0.05) 50%, rgba(255, 179, 0, 0.05) 100%);
    border-left: 4px solid transparent;
    border-image: linear-gradient(135deg, var(--accent-color), var(--accent-red), var(--accent-yellow)) 1;
}

.keynote-speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.keynote-speaker-card {
    display: block;
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(207, 102, 121, 0.1) 100%);
    padding: 2rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: all var(--transition-speed) ease;
    border: 2px solid transparent;
    background-clip: padding-box;
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
}

.keynote-speaker-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-red), var(--accent-yellow));
    opacity: 0;
    transition: opacity var(--transition-speed) ease;
    z-index: -1;
}

.keynote-speaker-card:hover:before {
    opacity: 0.1;
}

.keynote-speaker-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.keynote-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-red));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

.keynote-speaker-card h4 {
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.keynote-description {
    color: var(--dark-gray);
    opacity: 0.8;
    line-height: 1.6;
    margin-top: 1rem;
    font-style: italic;
}

/* Contact Grid */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.coordinator-item {
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.coordinator-item i {
    color: var(--accent-color);
    width: 16px;
}

/* Winter School Hero */
.winter-school-hero {
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.1) 0%, rgba(26, 115, 232, 0.05) 100%);
    border: 3px solid var(--accent-color);
    margin-bottom: 3rem;
    text-align: center;
}

.winter-school-hero h1 {
    font-size: 3rem;
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

.winter-school-subtitle {
    font-size: 1.5rem;
    color: var(--accent-color);
    font-weight: 500;
    margin-bottom: 1rem;
}

.event-details {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.event-detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--dark-gray);
    font-weight: 500;
}

.event-detail-item i {
    color: var(--accent-color);
}

/* Section Card */
.section-card {
    background-color: var(--secondary-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 2rem;
    border-left: 4px solid var(--accent-color);
}

.section-card h2 {
    color: var(--dark-gray);
    margin-bottom: 1.5rem;
}

.subsection {
    margin-bottom: 2rem;
}

.subsection h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

/* Topics Grid */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.topic-item {
    background-color: var(--light-gray);
    padding: 1rem;
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
}

.topic-item h4 {
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

.topic-item p {
    color: var(--dark-gray);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Prerequisites */
.prerequisites-list {
    list-style: none;
    padding: 0;
}

.prerequisites-list li {
    background-color: var(--light-gray);
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: 6px;
    border-left: 3px solid var(--accent-green);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.prerequisites-list i {
    color: var(--accent-green);
}

/* Software Grid */
.software-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.software-item {
    background-color: var(--light-gray);
    padding: 1rem;
    border-radius: 6px;
    text-align: center;
    border-top: 3px solid var(--accent-yellow);
}

.software-item i {
    font-size: 2rem;
    color: var(--accent-yellow);
    margin-bottom: 0.5rem;
}

/* Speakers Grid */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.speaker-card {
    display: block;
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    transition: all var(--transition-speed) ease;
    border-top: 4px solid var(--accent-color);
    text-decoration: none;
    color: inherit;
}

.speaker-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.speaker-card h4 {
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

.speaker-card:hover h4 {
    color: var(--accent-color);
}

.speaker-affiliation {
    color: var(--dark-gray);
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.speaker-role {
    color: var(--accent-color);
    font-size: 0.9rem;
    opacity: 0.8;
}

/* Schedule */
.schedule-container {
    margin: 2rem 0;
}

.day-schedule {
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    overflow: hidden;
    border: 1px solid var(--medium-gray);
}

.day-header {
    background-color: var(--accent-color);
    color: white;
    padding: 1rem 1.5rem;
    font-weight: 600;
    font-size: 1.2rem;
}

.schedule-events {
    padding: 0;
}

.schedule-event {
    display: grid;
    grid-template-columns: 120px 1fr 200px;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--medium-gray);
    transition: background-color var(--transition-speed) ease;
}

.event-buttons {
    grid-column: 2;
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.schedule-event .slides-btn {
    margin-right: 0;
}

.schedule-event:last-child {
    border-bottom: none;
}

.schedule-event:hover {
    background-color: var(--secondary-color);
}

.event-time {
    font-weight: 600;
    color: var(--accent-color);
    font-size: 0.9rem;
}

.event-title {
    font-weight: 500;
    color: var(--dark-gray);
}

.event-speaker {
    color: var(--dark-gray);
    font-size: 0.9rem;
    opacity: 0.8;
    text-align: right;
}

.break-event {
    background-color: rgba(255, 179, 0, 0.1) !important;
}

.break-event .event-title {
    color: var(--accent-yellow);
    font-style: italic;
}

.lunch-event {
    background-color: rgba(3, 218, 197, 0.1) !important;
}

.lunch-event .event-title {
    color: var(--accent-green);
    font-style: italic;
}

.keynote-event {
    background-color: rgba(26, 115, 232, 0.1) !important;
}

.keynote-event .event-title {
    color: var(--accent-color);
    font-weight: 600;
}

/* Back to Main */
.back-to-main {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 2rem;
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--accent-color);
    border-radius: 6px;
    transition: all var(--transition-speed) ease;
}

.back-to-main:hover {
    background-color: var(--accent-color);
    color: white;
}

/* Coordinators Section */
.coordinators-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.coordinator-group {
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--accent-color);
}

.coordinator-group h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.coordinator-item a {
    color: var(--dark-gray);
    text-decoration: none;
    font-weight: 500;
}

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

/* Accommodation */
.accommodation-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.accommodation-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: 6px;
    border-left: 3px solid var(--accent-color);
}

.accommodation-item i {
    color: var(--accent-color);
    font-size: 1.3rem;
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.accommodation-item div {
    flex: 1;
}

.accommodation-item strong {
    color: var(--dark-gray);
    display: block;
    margin-bottom: 0.25rem;
}

.accommodation-item div:not(:has(strong)) {
    color: var(--dark-gray);
    opacity: 0.8;
    font-size: 0.95rem;
}

.accommodation-details {
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: 6px;
    border-left: 4px solid var(--accent-green);
    margin-top: 2rem;
}

.accommodation-details h3 {
    color: var(--accent-green);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.accommodation-list {
    list-style: none;
    padding: 0;
}

.accommodation-list li {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    margin-bottom: 0.75rem;
    color: var(--dark-gray);
    line-height: 1.5;
}

.accommodation-list li:last-child {
    margin-bottom: 0;
}

.accommodation-list i {
    color: var(--accent-green);
    margin-top: 0.2rem;
    flex-shrink: 0;
}

/* INDIAai Logo and Partnership */
.indiaai-partnership {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding: 0.25rem 0;
}

.indiaai-logo {
    height: 30px;
    width: auto;
}

.partnership-text {
    font-size: 0.8rem;
    color: var(--dark-gray);
    opacity: 0.8;
    font-weight: 400;
}

/* Pre-Summit Event Banner */
.presummit-banner {
    border-radius: 12px;
    padding: 1rem 2rem;
    margin: 1.5rem 0;
    text-align: center;
}

.presummit-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.presummit-text {
    font-size: 1.8rem;
    color: var(--dark-gray);
    font-weight: 500;
}

.ai-summit-link {
    color: #332f81;
    text-decoration: none;
    font-size: 2.0rem;
    font-weight: 700;
    transition: all var(--transition-speed) ease;
    border-bottom: 2px solid transparent;
}

.logos-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin: 1rem 0;
}

.partner-logo {
    height: 100px;
    width: auto;
    transition: transform var(--transition-speed) ease;
}

.partner-logo.ai-summit-logo {
    padding: 0.8em;
}

/* AI Impact Summit Header Section */
.ai-summit-header {
    background-color: white;
    padding: 1rem;
    text-align: center;
    margin-bottom: 1rem;
    border-radius: var(--border-radius);
}

.partner-logos-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    flex-wrap: nowrap;
}

.ai-summit-top-logo,
.alphagrep-top-logo {
    height: 380px;
    width: auto;
    padding: 0.8em;
    max-width: 45%;
    object-fit: contain;
}

.partner-logo:hover {
    transform: scale(1.1);
}

.ai-summit-link:hover {
    color: #2a2664;
    border-bottom-color: #2a2664;
    transform: translateY(-1px);
}

/* News Section */
.news-section {
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.02) 0%, rgba(234, 91, 12, 0.02) 100%);
    border-left: 4px solid #ea5b0c;
}

.news-item {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.news-date {
    flex-shrink: 0;
    background: linear-gradient(135deg, #ea5b0c, #d14a06);
    color: white;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 140px;
}

.news-content {
    flex: 1;
}

.news-content h3 {
    color: var(--dark-gray);
    margin-bottom: 1rem;
    font-size: 1.4rem;
    line-height: 1.3;
}

.news-content p {
    color: var(--dark-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.news-content p:last-of-type {
    margin-bottom: 1.5rem;
}

.news-cta {
    margin-top: 1.5rem;
}

.news-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #ea5b0c;
    text-decoration: none;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border: 2px solid #ea5b0c;
    border-radius: 6px;
    transition: all var(--transition-speed) ease;
}

.news-link:hover {
    background-color: #ea5b0c;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(234, 91, 12, 0.3);
}

/* Selected Participants Section */
.selected-participants-section {
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.05) 0%, rgba(3, 218, 197, 0.05) 100%);
    border-left: 4px solid transparent;
    border-image: linear-gradient(135deg, var(--accent-color), var(--accent-green)) 1;
}

.participants-table-container {
    margin: 2rem 0;
    overflow-x: auto;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.participants-table {
    width: 100%;
    border-collapse: collapse;
    background-color: white;
    font-size: 0.95rem;
}

.participants-table th {
    background: linear-gradient(135deg, #1a237e 0%, #3949ab 50%, #5e35b1 100%);
    color: white;
    padding: 1rem 0.75rem;
    text-align: left;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.participants-table th:before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.participants-table th:hover:before {
    left: 100%;
}

.participants-table th:first-child {
    border-top-left-radius: 8px;
}

.participants-table th:last-child {
    border-top-right-radius: 8px;
}

.participants-table td {
    padding: 0.875rem 0.75rem;
    border-bottom: 1px solid var(--medium-gray);
    color: var(--dark-gray);
    vertical-align: middle;
}

.participants-table tbody tr {
    transition: background-color var(--transition-speed) ease;
}

.participants-table tbody tr:hover {
    background-color: rgba(26, 115, 232, 0.05);
}

.participants-table tbody tr:nth-child(even) {
    background-color: rgba(248, 249, 250, 0.8);
}

.participants-table tbody tr:nth-child(even):hover {
    background-color: rgba(26, 115, 232, 0.08);
}

.participants-table td:first-child {
    font-weight: 600;
    color: var(--accent-color);
    text-align: center;
    width: 60px;
}

.participants-table td:nth-child(2) {
    font-weight: 500;
    color: var(--dark-gray);
}

.participants-table td:nth-child(3) {
    color: var(--accent-green);
    font-weight: 500;
}

.selection-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.info-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    background-color: var(--light-gray);
    padding: 1.25rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
    transition: all var(--transition-speed) ease;
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.15);
}

.info-card:nth-child(2) {
    border-left-color: var(--accent-green);
}

.info-card:nth-child(3) {
    border-left-color: var(--accent-yellow);
}

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

.info-card:nth-child(2) i {
    color: var(--accent-green);
}

.info-card:nth-child(3) i {
    color: var(--accent-yellow);
}

.info-card div {
    flex: 1;
}

.info-card strong {
    color: var(--dark-gray);
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

/* Student Tabs */
.student-tabs {
    display: flex;
    gap: 1rem;
    margin: 2rem 0;
    border-bottom: 2px solid var(--light-gray);
    padding-bottom: 0;
}

.student-tab {
    background: none;
    border: none;
    padding: 1rem 1.5rem;
    cursor: pointer;
    font-weight: 500;
    color: var(--dark-gray);
    border-radius: 8px 8px 0 0;
    transition: all var(--transition-speed) ease;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
}

.student-tab:hover {
    background-color: rgba(26, 115, 232, 0.05);
    color: var(--accent-color);
}

.student-tab.active {
    background: linear-gradient(135deg, #1a237e 0%, #3949ab 50%, #5e35b1 100%);
    color: white;
    font-weight: 600;
}

.student-tab.active:hover {
    background: linear-gradient(135deg, #0d47a1 0%, #1976d2 50%, #512da8 100%);
    color: white;
}

.student-tab i {
    font-size: 0.9rem;
}

.student-category {
    display: none;
    animation: fadeIn 0.3s ease-in;
}

.student-category.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Table Controls */
.table-controls {
    text-align: center;
    margin-top: 1rem;
    padding: 1rem;
}

.show-more-btn,
.show-less-btn {
    background: linear-gradient(135deg, #1a237e 0%, #3949ab 50%, #5e35b1 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-speed) ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.show-more-btn:hover,
.show-less-btn:hover {
    background: linear-gradient(135deg, #0d47a1 0%, #1976d2 50%, #512da8 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
}

.show-more-btn i,
.show-less-btn i {
    font-size: 0.8rem;
    transition: transform var(--transition-speed) ease;
}

.show-more-btn:hover i {
    transform: translateY(2px);
}

.show-less-btn:hover i {
    transform: translateY(-2px);
}

/* Slides Button */
.slides-btn {
    background: linear-gradient(135deg, #ea5b0c 0%, #d14a06 100%);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 0.75rem;
    transition: all var(--transition-speed) ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
}

.slides-btn:hover {
    background: linear-gradient(135deg, #d14a06 0%, #b03e05 100%);
    transform: translateY(-1px);
    box-shadow: 0 3px 8px rgba(234, 91, 12, 0.3);
}

.slides-btn i {
    font-size: 0.8rem;
    transition: transform var(--transition-speed) ease;
}

.slides-btn:hover i {
    transform: scale(1.1);
}

/* Talk Preview */
.preview-btn {
    background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
    color: white;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 500;
    margin-top: 0.75rem;
    transition: all var(--transition-speed) ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.preview-btn:hover {
    background: linear-gradient(135deg, #388e3c 0%, #4caf50 100%);
    transform: translateY(-1px);
    box-shadow: 0 3px 8px rgba(76, 175, 80, 0.3);
}

.preview-btn i {
    font-size: 0.8rem;
    transition: transform var(--transition-speed) ease;
}

.talk-preview {
    margin-top: 1rem;
    padding: 0;
    overflow: hidden;
    transition: all 0.3s ease;
    border-radius: 8px;
}

.talk-preview.show {
    animation: slideDown 0.3s ease-out;
}

.preview-content {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #4caf50;
}

.preview-content h4 {
    color: var(--dark-gray);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.1rem;
}

.preview-content h4 i {
    color: #4caf50;
}

.preview-content p {
    color: var(--dark-gray);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.preview-topics,
.preview-audience {
    margin-top: 1.5rem;
}

.preview-topics h5,
.preview-audience h5 {
    color: var(--dark-gray);
    margin-bottom: 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.preview-topics ul {
    list-style: none;
    padding: 0;
}

.preview-topics li {
    color: var(--dark-gray);
    padding: 0.25rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.preview-topics li:before {
    content: '▸';
    color: #4caf50;
    font-weight: bold;
}

.preview-audience p {
    margin-bottom: 0;
    font-style: italic;
}

@keyframes slideDown {
    from { 
        max-height: 0;
        opacity: 0;
        transform: translateY(-10px);
    }
    to { 
        max-height: 500px;
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from { 
        max-height: 500px;
        opacity: 1;
        transform: translateY(0);
    }
    to { 
        max-height: 0;
        opacity: 0;
        transform: translateY(-10px);
    }
}

/* Coming Soon */
.coming-soon-container {
    text-align: center;
    padding: 3rem 2rem;
}

.coming-soon-icon {
    width: 100px;
    height: 100px;
    margin: 0 auto 2rem;
    background: linear-gradient(135deg, var(--accent-yellow), var(--accent-green));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.coming-soon-container h3 {
    color: var(--dark-gray);
    font-size: 2rem;
    margin-bottom: 1rem;
}

.coming-soon-container > p {
    color: var(--dark-gray);
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.8;
}

.info-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    background-color: var(--light-gray);
    padding: 1rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-yellow);
}

.info-item i {
    color: var(--accent-yellow);
    font-size: 1.2rem;
}

.notify-section {
    background-color: var(--light-gray);
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 2rem;
    border-left: 3px solid var(--accent-green);
}

.notify-section p {
    margin-bottom: 0.5rem;
    color: var(--dark-gray);
}

.notify-section p:last-child {
    margin-bottom: 0;
}

/* Mobile Responsive Styles */
@media (max-width: 768px) {
    /* Mobile Header Styles */
    header .container {
        display: flex;
        justify-content: space-between;
        align-items: center;
        flex-wrap: nowrap;
    }

    .hamburger {
        display: flex;
        flex-direction: column;
        background: none;
        border: none;
        cursor: pointer;
        padding: 0.5rem;
        z-index: 1001;
        order: 3;
    }

    .hamburger span {
        width: 25px;
        height: 3px;
        background-color: var(--primary-color);
        margin: 3px 0;
        transition: all 0.3s ease;
        border-radius: 2px;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }

    .logo {
        order: 1;
        flex: 1;
    }

    .logo h1 {
        font-size: 1.4rem;
    }

    nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--secondary-color);
        box-shadow: -2px 0 10px rgba(0,0,0,0.1);
        transition: right 0.3s ease;
        padding-top: 5rem;
        z-index: 999;
        order: 2;
        margin: 0;
    }

    nav.active {
        right: 0;
    }

    .nav-links {
        flex-direction: column;
        gap: 0;
        padding: 0;
    }

    .nav-links li {
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--medium-gray);
        width: 100%;
    }

    .nav-links li a {
        display: block;
    }

    nav::before {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100vw;
        height: 100vh;
        background-color: rgba(0, 0, 0, 0.5);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.3s ease;
    }

    nav.active::before {
        opacity: 1;
        pointer-events: all;
        z-index: -1;
    }

    .winter-school-hero h1 {
        font-size: 2rem;
    }
    
    .winter-school-subtitle {
        font-size: 1.2rem;
    }
    
    .event-details {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .schedule-event {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .event-speaker {
        text-align: left;
    }
    
    .coordinators-section,
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .keynote-speakers-grid {
        grid-template-columns: 1fr;
    }
    
    .coming-soon-container {
        padding: 2rem 1rem;
    }
    
    .coming-soon-icon {
        width: 80px;
        height: 80px;
        font-size: 2.5rem;
    }
    
    .coming-soon-container h3 {
        font-size: 1.5rem;
    }
    
    .indiaai-partnership {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
    }
    
    .indiaai-logo {
        height: 25px;
    }
    
    .partnership-text {
        font-size: 0.7rem;
    }
    
    .ai-summit-header {
        padding: 0.5rem;
        margin-bottom: 0.5rem;
    }
    
    .partner-logos-container {
        gap: 1.5rem;
        flex-wrap: nowrap;
    }
    
    .ai-summit-top-logo,
    .alphagrep-top-logo {
        height: auto;
        max-height: 150px;
        width: 45%;
        max-width: 45%;
    }
    
    .presummit-banner {
        padding: 0.75rem 1rem;
        margin: 1rem 0;
    }
    
    .presummit-text {
        font-size: 1.1rem;
    }
    
    .ai-summit-link {
        font-size: 1.3rem;
    }
    
    .logos-container {
        gap: 1rem;
    }
    
    .partner-logo {
        height: 70px;
    }
    
    .news-item {
        flex-direction: column;
        gap: 1rem;
    }
    
    .news-date {
        align-self: flex-start;
        min-width: auto;
        font-size: 0.8rem;
    }
    
    .news-content h3 {
        font-size: 1.2rem;
    }
    
    .news-link {
        padding: 0.6rem 1.2rem;
        font-size: 0.9rem;
    }
    
    .participants-table-container {
        margin: 1.5rem 0;
    }
    
    .participants-table {
        font-size: 0.85rem;
    }
    
    .participants-table th,
    .participants-table td {
        padding: 0.6rem 0.4rem;
    }
    
    .participants-table th {
        font-size: 0.8rem;
    }
    
    .selection-info {
        grid-template-columns: 1fr;
        gap: 1rem;
        margin-top: 1.5rem;
    }
    
    .info-card {
        padding: 1rem;
    }
    
    .info-card i {
        font-size: 1.2rem;
    }
    
    .info-card strong {
        font-size: 0.85rem;
    }
    
    .student-tabs {
        flex-direction: column;
        gap: 0.5rem;
        margin: 1.5rem 0;
    }
    
    .student-tab {
        padding: 0.75rem 1rem;
        border-radius: 6px;
        font-size: 0.9rem;
        justify-content: center;
    }
    
    .student-tab i {
        font-size: 0.8rem;
    }
    
    .table-controls {
        margin-top: 0.75rem;
        padding: 0.75rem;
    }
    
    .show-more-btn,
    .show-less-btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
    }
}