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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navigation */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo h2 {
       margin: 0;
    color: #2563eb;
    font-weight: 700;
    font-size: 1.4rem;
    line-height: 1.2;

 
}
.nav-logo h2 span {
    display: block;
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-logo img {
    height: 55px;
    width: auto;           /* keep natural aspect ratio */
    margin: 5px 10px 5px 5px;
}

.nav-logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.nav-logo-text h2 {
    margin: 0;
    color: #2563eb;
    font-weight: 700;
    font-size: 1.3rem;
}

.nav-logo-text p {
    margin: 0;
    font-size: 0.9rem;
    color: #4b5563;
}
.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: #2563eb;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.3s ease;
}

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

/* Dropdown Navigation */
.nav-dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dropdown-toggle i {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.nav-dropdown:hover .dropdown-toggle i {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    padding: 0.5rem 0;
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    z-index: 1000;
    border: 1px solid #e5e7eb;
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: #4b5563;
    text-decoration: none;
    transition: all 0.3s ease;
    font-weight: 500;
}

.dropdown-item:hover {
    background: #f8fafc;
    color: #2563eb;
    padding-left: 2rem;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

/* Hero Section */
.hero {
    background-image: url('images/bitsgoa.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    
    color: white;
    padding: 120px 0 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
}
/*.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.8) 0%, rgba(118, 75, 162, 0.8) 100%);
    z-index: 1;
}*/

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    margin-bottom: 2rem;
}

.hero-date {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.hero-location {
    font-size: 1.2rem;
    opacity: 0.9;
}

.hero-institute h3 {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 2.5rem;
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 30px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #059669 0%, #047857 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-graphic {
    width: 200px;
    height: 200px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s ease;
}

.hero-graphic:hover {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.15);
}

.hero-graphic i {
    font-size: 4rem;
    color: white;
}

/* Section Styles */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: #6b7280;
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background: #f8fafc;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
    color: #4b5563;
}

.capacity-notice {
    background: #fef3c7;
    border: 1px solid #f59e0b;
    border-radius: 12px;
    padding: 1.5rem;
    margin: 2rem 0;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.capacity-notice i {
    color: #f59e0b;
    font-size: 1.5rem;
}

.capacity-notice p {
    margin: 0;
    color: #92400e;
}

/* Courses Section */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.course-card {
    background: white;
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid #e5e7eb;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.course-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.course-icon i {
    font-size: 2rem;
    color: white;
}

.course-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1.5rem;
}

.course-topics {
    list-style: none;
}

.course-topics li {
    padding: 0.5rem 0;
    color: #4b5563;
    position: relative;
    padding-left: 1.5rem;
}

.course-topics li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: bold;
}

/* Important Dates Section */
.important-dates {
    background: #f8fafc;
}

.dates-content {
    max-width: 600px;
    margin: 0 auto;
}

.date-card {
    background: white;
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.date-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.date-icon i {
    font-size: 1.5rem;
    color: white;
}

.date-info h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 0.5rem;
}

.date {
    font-size: 1.1rem;
    color: #6b7280;
}

.status-notice {
    background: #fef2f2;
    border: 1px solid #fca5a5;
    border-radius: 12px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.status-notice i {
    color: #dc2626;
    font-size: 1.5rem;
}

.status-notice p {
    margin: 0;
    color: #991b1b;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: rgb(255, 247, 247);
    padding: 120px 0 80px;
    margin-top: 70px;
}

.breadcrumb {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    opacity: 0.9;
}

.breadcrumb a {
    color: white;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.breadcrumb a:hover {
    opacity: 0.8;
}

.separator {
    margin: 0 0.5rem;
    opacity: 0.7;
}

.page-header h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    margin: 0;
}

/* Active Navigation Link */
.nav-link.active {
    color: #2563eb;
    font-weight: 600;
}

.nav-link.active::after {
    width: 100%;
}

/* Organizing Committee Section */
.organizing-committee {
    background: #f8fafc;
    padding: 100px 0;
}

.committee-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 4rem;
    gap: 3rem;
}

.committee-title {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.section-number {
    font-size: 4rem;
    font-weight: 300;
    color: #d1d5db;
    margin-right: 1rem;
    line-height: 1;
}

.committee-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0;
}

.committee-description {
    flex: 1;
    max-width: 500px;
}

.committee-description p {
    font-size: 1.1rem;
    line-height: 1.7;
    color: #6b7280;
    margin: 0;
}

.committee-members-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
}

.committee-member {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 0;
    background: transparent;
}

.member-icon {
    width: 40px;
    height: 40px;
    background: #6b7280;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 0.5rem;
}

.member-icon i {
    font-size: 1.2rem;
    color: white;
}

.member-details {
    flex: 1;
}

.member-details h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1f2937;
    margin: 0 0 0.5rem 0;
}

.member-details .role {
    color: #4b5563;
    font-size: 1rem;
    font-weight: 400;
    margin: 0 0 0.25rem 0;
}

.member-details .affiliation {
    color: #6b7280;
    font-size: 1rem;
    font-weight: 400;
    margin: 0;
}

/* Contact Section */
.contact-section {
    background: #f8fafc;
    padding: 80px 0;
}

/* Registration Section */
.registration {
    background: #f8fafc;
}

.registration-content {
    max-width: 600px;
    margin: 0 auto;
}

.registration-notice {
    background: white;
    border-radius: 16px;
    padding: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    border: 2px solid #e5e7eb;
}

.registration-notice i {
    font-size: 3rem;
    color: #f59e0b;
    margin-bottom: 1rem;
}

.registration-notice h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 1rem;
}

.registration-notice p {
    color: #4b5563;
    margin-bottom: 1rem;
}

/* Footer */
.footer {
    background: #1f2937;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #d1d5db;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1rem;
    text-align: center;
    color: #9ca3af;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
        gap: 1rem;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        padding: 1rem;
        display: block;
        width: 100%;
    }

    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        background: #f8fafc;
        margin-left: 1rem;
        border-radius: 0;
    }

    .dropdown-item {
        padding: 0.5rem 1rem;
        border-left: 3px solid transparent;
    }

    .dropdown-item:hover {
        background: #e5e7eb;
        padding-left: 1rem;
        border-left-color: #2563eb;
    }

    .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-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-cta {
        justify-content: center;
    }

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

    .course-card {
        padding: 2rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .hero-graphic {
        width: 150px;
        height: 150px;
    }

    .hero-graphic i {
        font-size: 3rem;
    }
      .nav-logo img {
        height: 45px;
    }
    .nav-logo-text h2 {
        font-size: 1.1rem;
    }
    .nav-logo-text p {
        font-size: 0.8rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-date {
        font-size: 1.2rem;
    }

    .hero-location {
        font-size: 1rem;
    }

    .btn {
        padding: 10px 20px;
        font-size: 0.9rem;
    }

    .hero-graphic {
        width: 120px;
        height: 120px;
    }

    .hero-graphic i {
        font-size: 2.5rem;
    }

    section {
        padding: 60px 0;
    }

    .course-card {
        padding: 1.5rem;
    }

    .registration-notice {
        padding: 2rem;
    }

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

    .committee-header {
        flex-direction: column;
        gap: 2rem;
        margin-bottom: 3rem;
    }

    .committee-title h2 {
        font-size: 2rem;
    }

    .section-number {
        font-size: 3rem;
    }

    .committee-members-list {
        gap: 1.5rem;
    }

    .member-icon {
        width: 35px;
        height: 35px;
    }

    .member-icon i {
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .committee-title h2 {
        font-size: 1.8rem;
    }

    .section-number {
        font-size: 2.5rem;
    }

    .member-icon {
        width: 30px;
        height: 30px;
        margin-top: 0.25rem;
    }

    .member-icon i {
        font-size: 0.9rem;
    }

    .member-details h3 {
        font-size: 1.2rem;
    }

    .page-header {
        padding: 100px 0 60px;
    }

    .page-header h1 {
        font-size: 2.5rem;
    }

    .page-subtitle {
        font-size: 1.1rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .contact-card {
        padding: 2rem;
    }

    .venue-highlights {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .department-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .about-venue,
    .department-info {
        padding: 2rem;
    }

    .department-stats {
        grid-template-columns: 1fr;
    }

    .stat-item h4 {
        font-size: 2rem;
    }

    .about-venue h3,
    .department-info h3 {
        font-size: 1.5rem;
    }
}

/* Smooth scrolling and animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.course-card,
.date-card,
.registration-notice {
    animation: fadeInUp 0.6s ease-out;
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
.nav-link:focus,
.btn:focus {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .course-card,
    .date-card,
    .registration-notice {
        border: 2px solid #000;
    }
}