/* CSS Variables - Brand Colors */
:root {
    --navy-blue: #092854;
    --bright-blue: #1878F1;
    --dark-navy: #132442;
    --near-black: #000419;
    --light-gray-blue: #F0F4F7;
    --medium-gray: #DCE0E3;
    --white: #FFFFFF;
    --black: #000000;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --transition: 0.2s ease;
    --radius: 8px;
    --radius-lg: 12px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--near-black);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--bright-blue);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--navy-blue);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--navy-blue);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.25rem; }

@media (max-width: 768px) {
    h1 { font-size: 2.25rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.125rem; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: all var(--transition);
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: var(--navy-blue);
    color: var(--white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--medium-gray);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo-link {
    display: flex;
    align-items: center;
}

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

.header-cta {
    padding: 10px 20px;
    font-size: 0.9375rem;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 160px 0 120px;
    background-image: url('assets/hero_image_city_ai.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    text-align: center;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(to bottom, transparent, var(--white));
    pointer-events: none;
}


.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: 24px;
    color: var(--navy-blue);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--navy-blue);
    margin-bottom: 40px;
    opacity: 0.85;
}

.hero-note {
    margin-top: 16px;
    font-size: 0.875rem;
    color: var(--navy-blue);
    opacity: 0.7;
}

/* Section Styles */
.section-title {
    text-align: center;
    margin-bottom: 48px;
}

/* Benefits Section */
.benefits {
    padding: 100px 0;
    background-color: var(--white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.benefit-card {
    padding: 32px;
    background-color: var(--light-gray-blue);
    border-radius: var(--radius-lg);
    transition: transform var(--transition), box-shadow var(--transition);
}

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

.benefit-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background-color: var(--white);
    border-radius: var(--radius);
    margin-bottom: 20px;
    color: var(--bright-blue);
}

.benefit-title {
    margin-bottom: 12px;
    color: var(--navy-blue);
}

.benefit-description {
    color: var(--dark-navy);
    opacity: 0.85;
    font-size: 0.9375rem;
}

/* About Section */
.about {
    padding: 100px 0;
    background-color: var(--dark-navy);
}

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

.about .section-title {
    color: var(--white);
}

.about-text {
    color: var(--light-gray-blue);
    font-size: 1.125rem;
    margin-bottom: 24px;
    line-height: 1.8;
}

.about-text:last-child {
    margin-bottom: 0;
}

/* Founders Section */
.founders-section {
    margin-top: 48px;
    padding-top: 48px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.founders-title {
    color: var(--white);
    font-size: 1.5rem;
    margin-bottom: 32px;
}

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

.founder-card {
    text-align: center;
    padding: 24px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
}

.founder-image {
    width: 120px;
    height: 120px;
    min-width: 120px;
    min-height: 120px;
    max-width: 120px;
    max-height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    border: 3px solid var(--bright-blue);
    display: block;
}

.founder-name {
    color: #FFFFFF;
    font-size: 1.25rem;
    margin-bottom: 4px;
    margin-top: 0;
}

.founder-role {
    color: var(--bright-blue);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.founder-bio {
    color: var(--light-gray-blue);
    font-size: 0.9375rem;
    line-height: 1.7;
    text-align: left;
    margin-bottom: 16px;
}

.founder-linkedin {
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--bright-blue);
    transition: color var(--transition), transform var(--transition);
}

.founder-linkedin:hover {
    color: var(--white);
    transform: scale(1.1);
}

.founder-linkedin:focus {
    outline: 2px solid var(--bright-blue);
    outline-offset: 4px;
    border-radius: 4px;
}

.founder-linkedin svg {
    width: 24px;
    height: 24px;
}

@media (max-width: 768px) {
    .founders-grid {
        grid-template-columns: 1fr;
    }
    
    .founders-section {
        margin-top: 32px;
        padding-top: 32px;
    }
}

/* FAQ Section */
.faq {
    padding: 100px 0;
    background-color: var(--light-gray-blue);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--white);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--navy-blue);
    text-align: left;
    background-color: var(--white);
    transition: background-color var(--transition);
}

.faq-question:hover {
    background-color: var(--light-gray-blue);
}

.faq-icon {
    flex-shrink: 0;
    margin-left: 16px;
    color: var(--bright-blue);
    transition: transform var(--transition);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding-bottom: 8px;
}

.faq-answer p {
    padding: 0 24px 16px;
    margin: 0;
    color: var(--dark-navy);
    line-height: 1.7;
}

.faq-answer p:first-child {
    padding-top: 20px;
}

.faq-answer ul {
    margin: 0 0 16px 0;
    padding: 0 24px 0 48px;
    color: var(--dark-navy);
    line-height: 1.7;
}

.faq-answer ul li {
    margin-bottom: 8px;
    list-style-type: disc;
}

.faq-answer ul li:last-child {
    margin-bottom: 0;
}

/* CTA Section */
.cta {
    padding: 100px 0;
    background-color: var(--navy-blue);
    text-align: center;
}

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

.cta-title {
    color: var(--white);
    margin-bottom: 16px;
}

.cta-subtitle {
    color: var(--light-gray-blue);
    font-size: 1.125rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

/* Footer */
.footer {
    padding: 48px 0;
    background-color: var(--near-black);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.footer-brand {
    margin-bottom: 24px;
}

.footer-logo {
    width: 48px;
    height: 48px;
    margin: 0 auto 12px;
}

.footer-tagline {
    color: var(--medium-gray);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    color: var(--medium-gray);
    font-size: 0.875rem;
    transition: color var(--transition);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.footer-link:hover {
    color: var(--white);
}

.footer-copyright {
    color: var(--medium-gray);
    font-size: 0.75rem;
    opacity: 0.7;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 4, 25, 0.7);
    backdrop-filter: blur(4px);
}

.modal-container {
    position: relative;
    width: 100%;
    max-width: 520px;
    max-height: 90vh;
    overflow-y: auto;
    background-color: var(--white);
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-xl);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal.active .modal-container {
    transform: translateY(0);
}

.modal-container-large {
    max-width: 700px;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 8px;
    color: var(--dark-navy);
    opacity: 0.6;
    transition: opacity var(--transition);
}

.modal-close:hover {
    opacity: 1;
}

.modal-title {
    margin-bottom: 8px;
    font-size: 1.5rem;
}

.modal-subtitle {
    color: var(--dark-navy);
    opacity: 0.8;
    margin-bottom: 32px;
}

/* Form Styles */
.signup-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--navy-blue);
    margin-bottom: 6px;
}

.required {
    color: var(--bright-blue);
}

.form-input,
.form-select,
.form-textarea {
    padding: 12px 16px;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--medium-gray);
    border-radius: var(--radius);
    background-color: var(--white);
    color: var(--near-black);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--bright-blue);
    box-shadow: 0 0 0 3px rgba(24, 120, 241, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 80px;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 0.9375rem;
    color: var(--dark-navy);
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 3px;
    width: 16px;
    height: 16px;
    accent-color: var(--bright-blue);
}

/* Form Success State */
.form-success {
    text-align: center;
    padding: 40px 20px;
}

.form-success svg {
    color: var(--bright-blue);
    margin-bottom: 16px;
}

.form-success h3 {
    color: var(--navy-blue);
    margin-bottom: 8px;
}

.form-success p {
    color: var(--dark-navy);
    opacity: 0.8;
}

/* Share Section */
.share-section {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--medium-gray);
}

.share-prompt {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--navy-blue);
    margin-bottom: 16px;
    opacity: 1;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    font-family: inherit;
}

.share-btn svg {
    flex-shrink: 0;
}

.share-btn-linkedin {
    background-color: #0A66C2;
    color: var(--white);
}

.share-btn-linkedin:hover {
    background-color: #004182;
    color: var(--white);
}

.share-btn-x {
    background-color: #000000;
    color: var(--white);
}

.share-btn-x:hover {
    background-color: #333333;
    color: var(--white);
}

.share-btn-copy {
    background-color: var(--light-gray-blue);
    color: var(--navy-blue);
}

.share-btn-copy:hover {
    background-color: var(--medium-gray);
}

.share-btn-copy.copied {
    background-color: var(--bright-blue);
    color: var(--white);
}

/* Policy Content */
.policy-content {
    text-align: left;
}

.policy-content h3 {
    margin-top: 24px;
    margin-bottom: 12px;
    font-size: 1rem;
}

.policy-content h3:first-child {
    margin-top: 0;
}

.policy-content p {
    color: var(--dark-navy);
    margin-bottom: 12px;
    line-height: 1.7;
}

.policy-content ul {
    margin-bottom: 12px;
    padding-left: 24px;
}

.policy-content li {
    color: var(--dark-navy);
    margin-bottom: 6px;
    line-height: 1.6;
}

.policy-content a {
    color: var(--bright-blue);
}

/* Body scroll lock when modal is open */
body.modal-open {
    overflow: hidden;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
    
    .header-content {
        height: 64px;
    }
    
    .logo {
        height: 32px;
    }
    
    .header-cta {
        padding: 8px 16px;
        font-size: 0.875rem;
    }
    
    .hero {
        padding: 120px 0 80px;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .benefits,
    .about,
    .faq,
    .cta {
        padding: 64px 0;
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .benefit-card {
        padding: 24px;
    }
    
    .section-title {
        margin-bottom: 32px;
    }
    
    .modal-container {
        padding: 24px;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 12px;
    }
    
    .btn-large {
        padding: 14px 24px;
        font-size: 1rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .cta-title {
        font-size: 1.5rem;
    }
    
    .share-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    .share-btn {
        justify-content: center;
    }
}

/* Focus styles for accessibility */
.btn:focus-visible,
.faq-question:focus-visible,
.footer-link:focus-visible,
.share-btn:focus-visible,
.modal-close:focus-visible {
    outline: 2px solid var(--bright-blue);
    outline-offset: 2px;
}

.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
    outline: none;
    border-color: var(--bright-blue);
    box-shadow: 0 0 0 3px rgba(24, 120, 241, 0.2);
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--navy-blue);
    color: var(--white);
    padding: 8px 16px;
    z-index: 1001;
    text-decoration: none;
    font-weight: 500;
}

.skip-link:focus {
    top: 0;
}

/* Page Section Styles (for standalone pages) */
.page-section {
    padding: 120px 0 80px;
    min-height: calc(100vh - 200px);
}

.form-page-container {
    max-width: 520px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.content-page-container {
    max-width: 700px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.page-title {
    margin-bottom: 8px;
    font-size: 1.75rem;
    color: var(--navy-blue);
}

.page-subtitle {
    color: var(--dark-navy);
    opacity: 0.8;
    margin-bottom: 32px;
}

/* Radio Group Styles */
.radio-group {
    display: flex;
    gap: 24px;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9375rem;
    color: var(--dark-navy);
    cursor: pointer;
}

.radio-label input[type="radio"] {
    width: 18px;
    height: 18px;
    accent-color: var(--bright-blue);
}

@media (max-width: 768px) {
    .page-section {
        padding: 100px 0 60px;
    }
    
    .form-page-container,
    .content-page-container {
        padding: 24px;
        margin: 0 16px;
    }
    
    .page-title {
        font-size: 1.5rem;
    }
    
    .radio-group {
        flex-direction: column;
        gap: 12px;
    }
}

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