/* TeenTech Summit - Complete CSS with New Sections */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-blue: #2563eb;
    --primary-teal: #14b8a6;
    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    --blue-700: #1d4ed8;
    --blue-900: #1e3a8a;
    --teal-100: #ccfbf1;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --font-primary: 'Inter', system-ui, sans-serif;
    --font-display: 'Space Grotesk', sans-serif;
    --container-max-width: 1200px;
    --border-radius: 12px;
    --border-radius-lg: 16px;
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--gray-800);
    background: white;
    overflow-x: hidden;
}

html { scroll-behavior: smooth; }

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 14px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-primary.large {
    padding: 16px 32px;
    font-size: 16px;
}

.btn-primary.full-width {
    width: 100%;
    justify-content: center;
}

.btn-secondary {
    background: transparent;
    color: var(--gray-700);
    border: 2px solid var(--gray-300);
}

.btn-secondary:hover {
    background: var(--gray-50);
    border-color: var(--gray-500);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
}

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

.nav-logo .logo-link {
    display: inline-block;
    transition: opacity 0.3s ease;
}

.nav-logo .logo-link:hover {
    opacity: 0.8;
}

.nav-logo .logo {
    height: 40px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: 32px;
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 3px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--blue-50) 0%, #f0fdfa 100%);
    position: relative;
    overflow: hidden;
}

.hero-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: var(--gray-100);
    padding: 8px 16px;
    border-radius: 50px;
    margin-bottom: 24px;
}

.badge-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-700);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 16px;
    color: var(--gray-900);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--gray-600);
    margin-bottom: 24px;
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-bottom: 40px;
    justify-content: flex-start;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-blue);
    font-family: var(--font-display);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    font-weight: 500;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.hero-dates {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.date-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--gray-600);
    font-size: 0.875rem;
}

.date-item i {
    color: var(--primary-teal);
}

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 500px;
}

.floating-cards {
    position: relative;
    width: 100%;
    height: 100%;
}

.card {
    position: absolute;
    background: white;
    padding: 20px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    min-width: 120px;
    animation: float 6s ease-in-out infinite;
}

.card i {
    font-size: 2rem;
    color: var(--primary-blue);
}

.card span {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.card-1 { top: 20%; left: 10%; animation-delay: 0s; }
.card-2 { top: 10%; right: 20%; animation-delay: 1.5s; }
.card-3 { bottom: 30%; left: 20%; animation-delay: 3s; }
.card-4 { bottom: 20%; right: 10%; animation-delay: 4.5s; }

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* Sections */
section {
    padding: 80px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background: var(--gray-50);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.about-card {
    background: white;
    padding: 32px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

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

.about-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.about-card p {
    color: var(--gray-600);
    line-height: 1.6;
}

/* Benefits Section */
.benefits {
    background: white;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.benefit-card {
    background: var(--gray-50);
    padding: 32px;
    border-radius: var(--border-radius-lg);
    border-left: 4px solid var(--primary-teal);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

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

.benefit-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.benefit-card p {
    color: var(--gray-600);
    line-height: 1.6;
    margin-bottom: 16px;
}

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

.career-list li {
    padding: 4px 0;
    color: var(--gray-700);
    position: relative;
    padding-left: 20px;
}

.career-list li::before {
    content: '•';
    color: var(--primary-teal);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Program Timeline */
.program-timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.program-timeline::before {
    content: '';
    position: absolute;
    left: 30px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-blue), var(--primary-teal));
}

.timeline-item {
    position: relative;
    margin-bottom: 40px;
    padding-left: 80px;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 0;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
}

.week-number {
    color: white;
    font-weight: 700;
    font-size: 1.25rem;
}

.timeline-content {
    background: white;
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-teal);
}

.timeline-content h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--gray-600);
    margin-bottom: 16px;
}

.timeline-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.tag {
    background: var(--blue-100);
    color: var(--blue-700);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

/* Pricing Section */
.pricing {
    background: var(--gray-50);
}

.pricing-card {
    max-width: 600px;
    margin: 0 auto;
    background: white;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 2px solid transparent;
    background-image: linear-gradient(white, white), linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    background-origin: border-box;
    background-clip: content-box, border-box;
}

.pricing-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    color: white;
    padding: 40px 32px;
    text-align: center;
}

.price-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 8px;
    margin-bottom: 12px;
}

.currency {
    font-size: 1.5rem;
    font-weight: 600;
}

.amount {
    font-size: 3.5rem;
    font-weight: 800;
    font-family: var(--font-display);
}

.period {
    font-size: 1.125rem;
    opacity: 0.9;
}

.price-description {
    font-size: 1.125rem;
    opacity: 0.9;
}

.pricing-features {
    padding: 32px;
}

.pricing-features h4 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 20px;
}

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

.features-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    color: var(--gray-700);
}

.features-list i {
    color: var(--primary-teal);
    font-size: 1rem;
}

.pricing-details {
    padding: 0 32px 32px;
    border-top: 1px solid var(--gray-200);
    padding-top: 24px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 8px 0;
    gap: 16px;
}

.detail-label {
    font-weight: 500;
    color: var(--gray-700);
    min-width: 80px;
}

.detail-value {
    font-weight: 600;
    color: var(--gray-900);
    text-align: right;
    line-height: 1.4;
}

.pricing-cta {
    padding: 0 32px 32px;
    text-align: center;
}

.slots-warning {
    margin-top: 16px;
    color: var(--gray-600);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.slots-warning i {
    color: #f59e0b;
}

/* Registration Section */
.register {
    background: linear-gradient(135deg, var(--blue-900), var(--blue-700));
    color: white;
}

.register-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.register-info h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.register-info p {
    font-size: 1.125rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.requirements h3,
.why-join h3,
.contact-info h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--teal-100);
}

.requirements ul,
.benefits-list {
    list-style: none;
    margin-bottom: 32px;
    padding: 0;
}

.requirements li,
.benefits-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    color: rgba(255, 255, 255, 0.9);
}

.requirements i {
    color: var(--primary-teal);
}

.benefits-list li::before {
    content: '✓';
    color: var(--primary-teal);
    font-weight: bold;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.contact-item i {
    color: var(--primary-teal);
    font-size: 1.25rem;
    margin-top: 2px;
}

.contact-item div {
    color: rgba(255, 255, 255, 0.9);
}

.contact-item strong {
    color: white;
    display: block;
    margin-bottom: 4px;
}

.contact-item a {
    color: var(--teal-100);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: white;
}

.register-cta {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.cta-card {
    height: 100%;
    display: flex;
    flex-direction: column;
}

.cta-header {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    color: white;
    padding: 32px;
    text-align: center;
}

.cta-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.cta-header p {
    opacity: 0.9;
}

.cta-content {
    padding: 32px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.application-timeline {
    margin-bottom: 32px;
}

.timeline-step {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.step-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-teal));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.125rem;
}

.step-info strong {
    display: block;
    color: var(--gray-900);
    font-weight: 600;
    margin-bottom: 4px;
}

.step-info span {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.cta-note {
    margin-top: 16px;
    text-align: center;
    color: var(--gray-600);
    font-style: italic;
    font-weight: 500;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-logo {
    height: 40px;
    margin-bottom: 16px;
    filter: brightness(0) invert(1);
}

.footer-tagline {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--teal-100);
}

.footer-description {
    opacity: 0.8;
    line-height: 1.6;
}

.partnership-info {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-700);
}

.partnership-info p {
    margin-bottom: 8px;
    font-size: 0.875rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.link-group h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--teal-100);
}

.link-group a {
    display: block;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

.link-group a:hover {
    color: var(--primary-teal);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 20px;
    border-top: 1px solid var(--gray-700);
    opacity: 0.8;
    font-size: 0.875rem;
}

.footer-bottom-links {
    display: flex;
    gap: 24px;
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-bottom-links a:hover {
    color: var(--primary-teal);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-menu .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid var(--gray-200);
    }
    
    .nav-cta { 
        display: none; 
    }
    
    .hamburger { 
        display: flex;
        z-index: 1001;
    }
    
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    .hero-container { grid-template-columns: 1fr; gap: 40px; text-align: center; }
    .hero-visual { display: none; }
    .hero-stats, .hero-cta, .hero-dates { 
        justify-content: center;
        flex-wrap: wrap;
    }
    .register-content, .footer-content { grid-template-columns: 1fr; gap: 40px; }
    .footer-links { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
    .program-timeline::before { left: 15px; }
    .timeline-item { padding-left: 60px; }
    .timeline-marker { width: 40px; height: 40px; left: -5px; }
    .week-number { font-size: 1rem; }
    .benefits-grid { grid-template-columns: 1fr; }
    .benefit-card { padding: 24px; }
    .pricing-card { margin: 0 16px; }
    .pricing-header { padding: 32px 24px; }
    .pricing-features, .pricing-details, .pricing-cta { 
        padding-left: 24px; 
        padding-right: 24px; 
    }
    .price-amount { 
        flex-direction: row;
        gap: 4px;
        align-items: baseline;
        justify-content: center;
    }
    .amount { font-size: 2.5rem; }
    .currency { font-size: 1.25rem; }
    .period { font-size: 1rem; }
    .detail-row { flex-direction: column; gap: 4px; }
    .detail-value { text-align: left; }
    .contact-methods { gap: 12px; }
    .contact-item { padding: 10px 12px; }
    .cta-header { padding: 24px; }
    .cta-content { padding: 24px; }
    .timeline-step { gap: 12px; }
    .step-icon { width: 40px; height: 40px; font-size: 1rem; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .hero { padding: 100px 0 60px; }
    .hero-visual { height: 300px; }
    .card { min-width: 100px; padding: 16px; }
    .card i { font-size: 1.5rem; }
    section { padding: 60px 0; }
    .about-grid, .benefits-grid { grid-template-columns: 1fr; }
}