:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-bg: #f8f9fa;
    --dark-bg: #2c3e50;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding-top: 76px;
    scroll-behavior: smooth;
}

/* Navigation */
.navbar {
    background: rgba(44, 62, 80, 0.95) !important;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

.nav-link {
    font-weight: 500;
    margin: 0 5px;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--secondary-color) !important;
}

/* Hero Section */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    color: white;
}

/* Section Titles */
.section-title {
    position: relative;
    padding-bottom: 15px;
    margin-bottom: 30px;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--secondary-color);
}

/* Cards */
.card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: none;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15) !important;
}

.card-img-top {
    height: 250px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.card:hover .card-img-top {
    transform: scale(1.05);
}

/* Buttons */
.btn {
    border-radius: 50px;
    padding: 12px 30px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color), #2980b9);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9, var(--secondary-color));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.4);
}

.btn-warning {
    background: linear-gradient(135deg, #f39c12, #e67e22);
    color: white;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e67e22, #f39c12);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(243, 156, 18, 0.4);
}

/* Contact Items */
.contact-item {
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.contact-item:hover {
    transform: translateY(-5px);
}

/* Form Styles */
.form-control {
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.25rem rgba(52, 152, 219, 0.25);
}

/* Accordion */
.accordion-button {
    background: white;
    border-radius: 8px !important;
    padding: 20px;
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background: linear-gradient(135deg, var(--light-bg), white);
    color: var(--primary-color);
}

.accordion-body {
    background: var(--light-bg);
    border-radius: 0 0 8px 8px;
}

/* Footer */
footer a {
    transition: color 0.3s ease;
    text-decoration: none;
}

footer a:hover {
    color: var(--secondary-color) !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding-top: 60px;
    }
    
    .hero-section h1 {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 1s ease-in;
}

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

/* Icon Wrapper */
.icon-wrapper {
    width: 80px;
    height: 80px;
    background: rgba(52, 152, 219, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}



/* Speaker Section Styles */
.speaker-card {
    transition: all 0.3s ease;
    border-radius: 15px;
    overflow: hidden;
}

.speaker-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.2) !important;
}

.speaker-img {
    height: 300px;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.speaker-card:hover .speaker-img {
    transform: scale(1.05);
}

.speaker-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(to top, rgba(44, 62, 80, 0.9), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 20px;
}

.speaker-card:hover .speaker-overlay {
    opacity: 1;
}

.social-icons {
    display: flex;
    gap: 10px;
}

.social-icon {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-icon:hover {
    background: var(--secondary-color);
    color: white;
    transform: translateY(-3px);
}

/* Agenda Table Styles */
.table-hover tbody tr:hover {
    background-color: rgba(52, 152, 219, 0.1);
}

.table th {
    border-top: none;
    font-weight: 600;
}

.badge {
    padding: 6px 12px;
    font-weight: 500;
}

/* Interest Checkboxes */
.form-check-input:checked {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}