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

:root {
    --primary-color: #d9f2fd;
    --secondary-color: #0891b2;
    --accent-color: #0e7490;
    --text-dark: #1e293b;
    --text-light: #475569;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #f8fafc;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigation */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo h1 {
    font-size: 1.5rem;
    color: var(--accent-color);
    font-weight: 700;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-link {
    background: none;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-light);
    cursor: pointer;
    transition: all 0.3s ease;
    border-radius: 8px;
}

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

.nav-link.active {
    background-color: var(--primary-color);
    color: var(--accent-color);
    font-weight: 600;
}

/* Tab Content */
.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--white) 100%);
    border-radius: 16px;
    padding: 3rem;
    margin: 2rem 0;
    box-shadow: var(--shadow-lg);
}

.hero-image {
    text-align: center;
    margin-bottom: 2rem;
}

.hero-image img {
    max-width: 80%;
    height: auto;
    border-radius: 12px;
    padding: 20px;
}

.hero-text h2 {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.subtitle {
    font-size: 1.5rem;
    color: var(--secondary-color);
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.intro {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* Key Info Cards */
.key-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.info-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s ease;
}

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

.info-card h3 {
    font-size: 1.25rem;
    color: var(--accent-color);
    margin-bottom: 0.5rem;
}

.info-card p {
    font-size: 1.125rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* CTA Section */
.cta-section {
    background-color: var(--primary-color);
    padding: 3rem;
    border-radius: 12px;
    text-align: center;
    margin: 3rem 0;
}

.cta-section h3 {
    font-size: 2rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

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

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

/* Info Tab */
.info-header {
    text-align: center;
    margin: 2rem 0;
}

.info-image {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.info-header h2 {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 2rem;
}

.info-section {
    background-color: var(--white);
    padding: 2rem;
    margin: 1.5rem 0;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.info-section h3 {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.info-section p {
    font-size: 1.125rem;
    color: var(--text-light);
    line-height: 1.8;
}

.info-section strong {
    color: var(--text-dark);
}

/* Registration Tab */
.registration-info {
    display: grid;
    gap: 2rem;
    margin: 2rem 0;
}

.info-box {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.info-box h3 {
    font-size: 1.75rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

.info-box p {
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.info-box .note {
    background-color: #fef3c7;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #f59e0b;
    font-style: italic;
    margin: 1.5rem 0;
}

.info-box a:not(.btn) {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 600;
}

.info-box a:not(.btn):hover {
    color: var(--accent-color);
    text-decoration: underline;
}

.info-box .btn {
    margin-top: 1.5rem;
}

/* Footer */
footer {
    background-color: var(--white);
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
    box-shadow: 0 -4px 6px rgba(0, 0, 0, 0.05);
}

footer p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar .container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-direction: column;
        width: 100%;
        text-align: center;
    }

    .nav-link {
        width: 100%;
    }

    .hero {
        padding: 2rem;
    }

    .hero-text h2 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.25rem;
    }

    .key-info {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 1rem;
    }
}