/* POTS Check Website - Global Styles
 * Matching iOS app visual identity
 * Colors from app design system
 */

/* ============================================
   CSS Variables (Design Tokens)
   ============================================ */
:root {
    /* Primary Colors */
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-secondary: #7c3aed;

    /* Status Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    /* Text Colors */
    --color-text-primary: #1f2937;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    --color-text-inverse: #ffffff;

    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;

    /* Border Colors */
    --color-border: #e5e7eb;
    --color-border-dark: #d1d5db;

    /* Gradients */
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-card: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.08);

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Layout */
    --max-width-content: 1200px;
    --max-width-text: 720px;
    --header-height: 72px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-primary-hover);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--font-size-4xl);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-3xl);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: var(--spacing-md);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-xl);
}

li {
    margin-bottom: var(--spacing-sm);
}

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: var(--max-width-content);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 700;
    font-size: var(--font-size-xl);
    color: var(--color-text-primary);
}

.logo img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.nav-link {
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: color 0.2s ease;
}

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

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    border-radius: var(--radius-lg);
    font-weight: 600;
    transition: background-color 0.2s ease, transform 0.2s ease;
}

.nav-cta:hover {
    background: var(--color-primary-hover);
    color: var(--color-text-inverse);
    transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    margin: 5px 0;
    transition: transform 0.2s ease;
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    background: var(--gradient-hero);
    color: var(--color-text-inverse);
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.hero-container {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.hero h1 {
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
    font-size: clamp(2rem, 5vw, 3.5rem);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    opacity: 0.95;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

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

.btn-secondary {
    background: var(--color-bg-primary);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

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

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

.btn-outline-white {
    background: rgba(255, 255, 255, 0.15);
    color: var(--color-text-inverse);
    border: 2px solid var(--color-text-inverse) !important;
}

.btn-outline-white:hover {
    background: var(--color-text-inverse);
    color: var(--color-text-primary);
}

.btn-large {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
}

/* ============================================
   Sections
   ============================================ */
.section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.section-alt {
    background: var(--color-bg-secondary);
}

.section-container {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    margin-bottom: var(--spacing-md);
}

.section-header p {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Cards
   ============================================ */
.card {
    background: var(--color-bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-icon {
    width: 48px;
    height: 48px;
    background: var(--gradient-card);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    font-size: 24px;
}

.card h3 {
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

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

/* Feature Card */
.feature-card {
    text-align: center;
}

.feature-card .card-icon {
    margin-left: auto;
    margin-right: auto;
}

/* ============================================
   Disclaimer Box (Medical)
   ============================================ */
.disclaimer {
    background: #fef3c7;
    border: 1px solid #f59e0b;
    border-left: 4px solid #f59e0b;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.disclaimer-icon {
    color: #d97706;
    font-size: 24px;
    margin-bottom: var(--spacing-sm);
}

.disclaimer h4 {
    color: #92400e;
    margin-bottom: var(--spacing-sm);
}

.disclaimer p {
    color: #92400e;
    margin-bottom: 0;
    font-size: var(--font-size-sm);
}

/* ============================================
   Steps / How It Works
   ============================================ */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    counter-reset: step;
}

.step {
    position: relative;
    padding-left: 60px;
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 44px;
    height: 44px;
    background: var(--gradient-hero);
    color: var(--color-text-inverse);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.step h3 {
    margin-bottom: var(--spacing-sm);
}

.step p {
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

/* ============================================
   Requirements Section
   ============================================ */
.requirements {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.requirement {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.requirement-icon {
    font-size: 32px;
}

.requirement-text strong {
    display: block;
}

.requirement-text span {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
    background: var(--gradient-hero);
    color: var(--color-text-inverse);
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.cta-section h2 {
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
}

.cta-section p {
    opacity: 0.95;
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--color-text-primary);
    color: var(--color-text-inverse);
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-xl);
}

.footer-container {
    max-width: var(--max-width-content);
    margin: 0 auto;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-links h4 {
    color: var(--color-text-inverse);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--color-text-inverse);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
    margin: 0;
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

.footer-legal a:hover {
    color: var(--color-text-inverse);
}

/* ============================================
   Content Pages
   ============================================ */
.content-page {
    max-width: var(--max-width-text);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.content-page h1 {
    margin-bottom: var(--spacing-lg);
}

.content-page h2 {
    margin-top: var(--spacing-2xl);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.content-page h3 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
}

/* Info Boxes */
.info-box {
    background: #e0f2fe;
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.info-box p:last-child {
    margin-bottom: 0;
}

/* ============================================
   FAQ
   ============================================ */
.faq-item {
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-lg) 0;
}

.faq-question {
    font-weight: 600;
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.faq-answer {
    color: var(--color-text-secondary);
}

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

/* ============================================
   App Store Badge
   ============================================ */
.app-store-badge {
    display: inline-block;
    transition: transform 0.2s ease;
}

.app-store-badge:hover {
    transform: scale(1.05);
}

.app-store-badge img {
    height: 50px;
    width: auto;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .nav {
        display: none;
        position: absolute;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-lg);
    }

    .nav.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .hero h1 {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .steps {
        grid-template-columns: 1fr;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ============================================
   Utilities
   ============================================ */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-secondary);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.hidden {
    display: none;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Legal Pages
   ============================================ */
.legal-page {
    max-width: 900px;
}

.effective-date {
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-md);
    background: var(--color-bg-secondary);
    border-left: 4px solid var(--color-primary);
    border-radius: var(--radius-sm);
}

/* Data Tables */
.data-table-container {
    overflow-x: auto;
    margin: var(--spacing-lg) 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.data-table th,
.data-table td {
    border: 1px solid var(--color-border);
    padding: var(--spacing-md);
    text-align: left;
}

.data-table th {
    background: var(--color-bg-secondary);
    font-weight: 600;
}

.data-table tr:nth-child(even) {
    background: var(--color-bg-secondary);
}

/* Additional Info Box Colors */
.info-box h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

/* Success/Error Light Backgrounds */
:root {
    --color-success-light: #d1fae5;
    --color-error-light: #fee2e2;
}

.info-box ul {
    margin-bottom: 0;
}

.info-box ul li:last-child {
    margin-bottom: 0;
}

/* FAQ Page Schema Markup */
.content-page section {
    margin-bottom: var(--spacing-xl);
}

/* Content page cards in grid */
.content-page .card-grid {
    margin-top: var(--spacing-lg);
}

.content-page .card h3 {
    margin-top: 0;
}