/* CSS Variables for Theme */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 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);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Disclosure Bar */
.disclosure-bar {
    background-color: var(--text-primary);
    color: var(--bg-primary);
    text-align: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
    font-weight: 500;
    position: sticky;
    top: 0;
    z-index: 1000;
}

/* Header */
.main-header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.home-btn {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
}

.home-btn:hover,
.home-btn:focus {
    color: var(--primary-color);
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Hero Section */
.hero {
    padding: var(--spacing-2xl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.medical-notice {
    background-color: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: #92400e;
}

.cta-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn-apple {
    background-color: #000000;
    color: #ffffff;
}

.btn-apple:hover {
    background-color: #1a1a1a;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-google {
    background-color: #4285f4;
    color: #ffffff;
}

.btn-google:hover {
    background-color: #357ae8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-small {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.875rem;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Section Styles */
section {
    padding: var(--spacing-2xl) 0;
}

section:nth-child(even) {
    background-color: var(--bg-secondary);
}

h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    text-align: center;
}

.section-intro {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.feature-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
}

/* How It Works */
.how-it-works {
    background-color: var(--bg-primary);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.step {
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.how-it-works-image {
    margin-top: var(--spacing-xl);
}

.how-it-works-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Use Cases */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.use-case-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--primary-color);
}

.use-case-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.use-case-card p {
    color: var(--text-secondary);
}

.medical-notice-inline {
    background-color: #fef3c7;
    border-left: 4px solid #f59e0b;
    padding: var(--spacing-sm);
    margin-top: var(--spacing-xl);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: #92400e;
    text-align: center;
}

/* Trust & Privacy */
.trust-privacy {
    background-color: var(--bg-primary);
}

.trust-content {
    max-width: 800px;
    margin: 0 auto;
}

.trust-content p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.privacy-note {
    font-size: 0.875rem;
    color: var(--text-light);
    font-style: italic;
}

/* Comments Section */
.comments-section {
    background-color: var(--bg-secondary);
}

.disclosure-notice {
    background-color: #fee2e2;
    border-left: 4px solid #ef4444;
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: #991b1b;
    text-align: center;
}

.comments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.comment-card {
    background-color: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.comment-header {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.comment-avatar {
    width: 3rem;
    height: 3rem;
    background-color: var(--primary-color);
    color: var(--bg-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.comment-author {
    display: flex;
    flex-direction: column;
}

.comment-author strong {
    color: var(--text-primary);
}

.comment-date {
    font-size: 0.875rem;
    color: var(--text-light);
}

.comment-text {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* FAQ Section */
.faq-section {
    background-color: var(--bg-primary);
}

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

.faq-item {
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--spacing-sm);
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: background-color 0.2s;
    font-family: var(--font-family);
}

.faq-question:hover,
.faq-question:focus {
    background-color: var(--bg-secondary);
    outline: none;
}

.faq-question:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: -2px;
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
    transition: transform 0.3s;
}

.faq-question[aria-expanded="true"] .faq-icon {
    transform: rotate(45deg);
}

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

.faq-answer.active {
    max-height: 500px;
}

.faq-answer p {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* Final CTA */
.final-cta {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--bg-primary);
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.final-cta h2 {
    color: var(--bg-primary);
    margin-bottom: var(--spacing-md);
}

.cta-subtitle {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: rgba(255, 255, 255, 0.9);
}

.final-cta .medical-notice {
    background-color: rgba(255, 255, 255, 0.2);
    border-left-color: #ffffff;
    color: var(--bg-primary);
    margin-bottom: var(--spacing-lg);
}

.final-cta .cta-buttons {
    justify-content: center;
}

.final-cta .btn-apple {
    background-color: #000000;
}

.final-cta .btn-google {
    background-color: #ffffff;
    color: #4285f4;
}

.final-cta .btn-google:hover {
    background-color: #f3f4f6;
}

/* Sticky CTA */
.sticky-cta {
    position: fixed;
    bottom: -100px;
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.1);
    padding: var(--spacing-sm);
    z-index: 998;
    transition: bottom 0.3s ease-out;
}

.sticky-cta.visible {
    bottom: 0;
}

.sticky-cta-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

/* Footer */
.main-footer {
    background-color: var(--text-primary);
    color: var(--bg-secondary);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h3 {
    color: var(--bg-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-section address {
    font-style: normal;
    color: var(--text-light);
    line-height: 1.8;
}

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover,
.footer-section a:focus {
    color: var(--bg-primary);
    outline: 2px solid var(--bg-primary);
    outline-offset: 2px;
}

.footer-nav {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-disclosures,
.footer-legal {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-disclosures h3,
.footer-legal h3 {
    color: var(--bg-primary);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-disclosures p,
.footer-legal p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
}

.footer-bottom {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

.image-attribution {
    margin-top: var(--spacing-sm);
}

.image-attribution a {
    color: var(--text-light);
    text-decoration: underline;
}

.image-attribution a:hover,
.image-attribution a:focus {
    color: var(--bg-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .cta-buttons {
        flex-direction: column;
    }

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

    .step {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .sticky-cta-content {
        flex-direction: column;
    }

    .sticky-cta-content .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero {
        padding: var(--spacing-xl) 0;
    }

    section {
        padding: var(--spacing-xl) 0;
    }

    .hero-content h1 {
        font-size: 1.75rem;
    }

    .features-grid,
    .use-cases-grid,
    .comments-grid {
        grid-template-columns: 1fr;
    }
}

/* Accessibility: Focus States */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .disclosure-bar,
    .main-header,
    .sticky-cta,
    .cta-buttons {
        display: none;
    }
}