:root {
    --primary-color: #0066cc;
    --secondary-color: #28a745;
    --dark-color: #212529;
    --light-bg: #f8f9fa;
    --shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 114px;
}

header {
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar {
    padding: 0.5rem 0;
}

.navbar .container {
    padding-left: 1rem;
    padding-right: 1rem;
}

.navbar-brand {
    font-size: 1.5rem;
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
}

.logo {
    height: 60px;
    width: auto;
    max-width: 200px;
    transition: transform 0.3s ease;
    display: block;
}

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

.logo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 120px;
    height: 60px;
    border: 2px dashed #ddd;
    border-radius: 4px;
    color: var(--primary-color);
    font-size: 1.5rem;
    transition: all 0.3s ease;
}

.logo-placeholder:hover {
    border-color: var(--primary-color);
    background-color: rgba(0, 102, 204, 0.05);
}

.nav-link {
    font-weight: 500;
    color: #555;
    padding: 0.5rem 1rem;
    transition: color 0.3s ease;
}

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

.dropdown-menu {
    border: none;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    padding: 0.5rem 0;
}

.navbar-nav .dropdown:hover .dropdown-menu {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.dropdown-item {
    padding: 0.75rem 1.5rem;
    color: #555;
    font-weight: 500;
    transition: all 0.3s ease;
}

.dropdown-item:hover {
    background-color: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
    padding-left: 2rem;
}

.dropdown-toggle::after {
    margin-left: 0.5rem;
}

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 0;
    min-height: 32vh;
    display: flex;
    align-items: center;
}

.hero-section h1 {
    animation: fadeInUp 0.8s ease;
}

.hero-section h3 {
    animation: fadeInUp 0.8s ease;
}

.hero-section .lead {
    animation: fadeInUp 1s ease;
    font-size: 1.5rem;
}

.min-vh-75 {
    min-height: 75vh;
}

.date-badge {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    animation: fadeInUp 1.2s ease;
}

.card {
    border: none;
    border-radius: 12px;
    transition: all 0.3s ease;
    overflow: hidden;
}

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

.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card-body {
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.icon-box {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2rem;
}

#may15 .icon-box {
    background: linear-gradient(135deg, #28a745 0%, #20c997 100%);
}

.badge {
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    font-weight: 500;
    border-radius: 50px;
}

section {
    padding: 4rem 0;
}

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

.event-image-placeholder {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}

.event-image-placeholder img {
    transition: transform 0.3s ease;
}

.event-image-placeholder:hover img {
    transform: scale(1.05);
}

section h2 {
    color: var(--dark-color);
    position: relative;
    padding-bottom: 1rem;
}

section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

section h3 {
    color: var(--dark-color);
}

.sponsor-logo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    padding: 1.5rem;
    background-color: transparent;
    border: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    text-align: center;
}

.sponsor-logo-placeholder span {
    color: #adb5bd;
    font-size: 0.9rem;
    font-weight: 500;
    border: 2px dashed #dee2e6;
    padding: 2rem;
    border-radius: 8px;
    background-color: #f8f9fa;
}

.sponsor-logo-placeholder:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.sponsor-logo-placeholder img {
    max-width: 100%;
    max-height: 100px;
    width: auto;
    height: auto;
    object-fit: contain;
}

.schedule-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.schedule-list li {
    padding: 0.75rem 0;
    padding-left: 1.5rem;
    position: relative;
    border-bottom: 1px solid #e9ecef;
}

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

.schedule-list li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.5rem;
    line-height: 1.2;
}

.schedule-list a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.schedule-list a:hover {
    text-decoration: underline;
}

.benefit-list {
    list-style: none;
    padding-left: 0;
    margin-bottom: 1.5rem;
}

.benefit-list li {
    padding: 1rem 0;
    padding-left: 2rem;
    position: relative;
    border-left: 3px solid var(--primary-color);
    margin-bottom: 0.75rem;
    background-color: rgba(102, 126, 234, 0.05);
    padding-right: 1rem;
    border-radius: 4px;
}

.benefit-list li::before {
    content: '✓';
    position: absolute;
    left: 0.5rem;
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.2rem;
}

.agenda-container {
    max-height: 600px;
    overflow-y: auto;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 1rem;
    background-color: #fff;
}

.agenda-item {
    display: flex;
    padding: 1rem;
    border-left: 3px solid var(--primary-color);
    margin-bottom: 0.75rem;
    background-color: #f8f9fa;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.agenda-item:hover {
    background-color: rgba(102, 126, 234, 0.05);
    transform: translateX(3px);
}

.agenda-item.agenda-break {
    border-left-color: #28a745;
    background-color: #e8f5e9;
}

.agenda-item.agenda-highlight {
    border-left-color: #ff9800;
    background-color: #fff3e0;
}

.agenda-time {
    font-weight: 600;
    color: var(--primary-color);
    min-width: 140px;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.agenda-content {
    flex-grow: 1;
}

.agenda-content strong {
    display: block;
    margin-bottom: 0.25rem;
    color: var(--dark-color);
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    padding: 0.75rem 2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

#may-13 {
    background-color: white;
}

#may-14 {
    background-color: var(--light-bg);
}

footer {
    margin-top: auto;
}

footer h5 {
    font-weight: 600;
    margin-bottom: 1rem;
}

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

@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 0;
        min-height: 60vh;
    }

    .hero-section h1 {
        font-size: 2.5rem;
    }

    .hero-section .lead {
        font-size: 1.2rem;
    }

    .navbar-nav {
        padding-top: 1rem;
    }

    .nav-link {
        padding: 0.5rem 0;
    }

    .logo-placeholder {
        width: 80px;
        height: 50px;
        font-size: 1.2rem;
    }

    .date-badge {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .display-3 {
        font-size: 2rem;
    }

    .display-5 {
        font-size: 2rem;
    }

    section {
        padding: 2rem 0;
    }
}

.shadow-sm {
    box-shadow: var(--shadow) !important;
}

section[id] {
    scroll-margin-top: 80px;
}