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

:root {
    /* App Theme Colors - Matching the React app */
    --color-primary: #6b7280;           /* grey-500 - main brand color */
    --color-primary-dark: #4b5563;      /* grey-600 - darker shade */
    --color-primary-darker: #374151;     /* grey-700 - darkest shade */
    --color-primary-light: #9ca3af;     /* grey-400 - lighter shade */
    --color-primary-lighter: #d1d5db;   /* grey-300 - lightest shade */
    
    /* Text Colors */
    --color-text-primary: #111827;
    --color-text-secondary: #6b7280;
    --color-text-tertiary: #9ca3af;
    --color-text-inverse: #ffffff;
    
    /* Background Colors */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f9fafb;
    --color-bg-tertiary: #f3f4f6;
    
    /* Border Colors */
    --color-border-light: #e5e7eb;
    --color-border-medium: #d1d5db;
    --color-border-dark: #9ca3af;
    
    /* Gradient - Matching app header */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    
    /* Shadows */
    --shadow-primary: rgba(107, 114, 128, 0.2);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    
    /* Typography - Matching app */
    --font-primary: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-secondary);
    min-height: 100vh;
    padding: var(--spacing-md);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Desktop: Add subtle background to show centered app - Matching app style */
@media (min-width: 1024px) {
    body {
        background-color: #f5f5f5;
    }
}

/* Container - Matching app's centered container style */
.container {
    max-width: 768px;
    margin: 0 auto;
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Header - Matching app's header gradient */
.header {
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.header-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.header-logo {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    object-fit: contain;
    display: block;
    box-shadow: 0 4px 20px rgba(156, 163, 175, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.header-brand-label {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-inverse);
    font-family: var(--font-primary);
    white-space: nowrap;
    line-height: 1;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
    margin: 0;
    padding: 0;
}

.header h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin: var(--spacing-sm) 0 0 0;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--color-text-inverse);
    font-family: var(--font-primary);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
    padding: 0;
}

.header .subtitle {
    font-size: 1.2rem;
    font-weight: 400;
    max-width: 700px;
    margin: var(--spacing-md) auto 0;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.7), 0 1px 3px rgba(0, 0, 0, 0.5);
    line-height: 1.4;
}

.header .subtitle strong {
    font-weight: 600;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.7), 0 1px 3px rgba(0, 0, 0, 0.5);
}

.header .subtitle em {
    font-style: italic;
    color: #ffffff;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.7), 0 1px 3px rgba(0, 0, 0, 0.5);
}

/* Divider */
.divider {
    border: none;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-border-light), transparent);
    margin: var(--spacing-xl) 0;
}

/* Content */
.content {
    padding: var(--spacing-xl) var(--spacing-lg);
}

section {
    margin-bottom: var(--spacing-2xl);
}

section:last-of-type {
    margin-bottom: 0;
}

/* Typography - Content sections only */
.content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary-darker);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-xs);
    border-bottom: 3px solid var(--color-primary);
    position: relative;
    line-height: 1.2;
    font-family: var(--font-primary);
    letter-spacing: -0.01em;
}

.content h2::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--color-primary-dark);
}

.content h3 {
    font-size: 1.44rem;
    font-weight: 600;
    color: var(--color-primary-darker);
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-primary);
    line-height: 1.2;
}

p {
    margin-bottom: 1.25rem;
    color: var(--color-text-primary);
    line-height: 1.65;
    font-family: var(--font-primary);
}

/* Lists */
ul {
    list-style: none;
    padding-left: 0;
}

li {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
    position: relative;
}

li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.2rem;
}

li p {
    margin-bottom: 0;
}

/* Title emphasis for the start of paragraphs and list items */
p > strong:first-child,
li p strong:first-of-type {
    color: var(--color-primary);
    font-size: 1.15rem;
    font-weight: 700;
    margin-right: 4px;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

li p strong {
    color: var(--color-primary-darker);
    font-weight: 600;
}

li p em {
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Text Emphasis */
strong {
    color: var(--color-primary-darker);
    font-weight: 600;
}

em {
    color: var(--color-text-secondary);
    font-style: italic;
}

/* Footer */
.footer {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-xl) var(--spacing-lg);
    border-top: 1px solid var(--color-border-light);
    text-align: center;
}

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

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

.footer-copyright {
    margin-top: var(--spacing-md);
    color: var(--color-text-tertiary);
    font-size: 0.85rem;
    opacity: 0.8;
}

.footer-link {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--color-text-inverse);
    font-size: 1.25rem;
    font-weight: 700;
    text-decoration: none;
    font-family: var(--font-primary);
    transition: all var(--transition-base);
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    letter-spacing: 0.02em;
}

.footer-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    opacity: 0.95;
}

.footer-link:active {
    transform: translateY(-1px);
}

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

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
    }
    
    .container {
        border-radius: var(--radius-md);
    }
    
    .header {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .header-brand {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .header-logo {
        width: 50px;
        height: 50px;
    }
    
    .header-brand-label {
        font-size: 1.25rem;
    }
    
    .header h2 {
        font-size: 1.75rem;
        line-height: 1.2;
        margin-top: var(--spacing-xs);
    }
    
    .header .subtitle {
        font-size: 1.1rem;
    }
    
    .content {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .content h2 {
        font-size: 1.5rem;
    }
    
    .content h3 {
        font-size: 1.25rem;
    }
    
    section {
        margin-bottom: var(--spacing-xl);
    }
    
    .footer {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .footer-link {
        font-size: 1.1rem;
        padding: var(--spacing-sm) var(--spacing-lg);
        width: 100%;
        max-width: 280px;
    }
}

@media (max-width: 480px) {
    body {
        padding: var(--spacing-xs);
        font-size: 15px;
    }
    
    .header {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .header-logo {
        width: 45px;
        height: 45px;
    }
    
    .header-brand-label {
        font-size: 1.125rem;
    }
    
    .header h2 {
        font-size: 1.5rem;
        margin-top: var(--spacing-xs);
    }
    
    .header .subtitle {
        font-size: 1rem;
    }
    
    .content {
        padding: var(--spacing-md) var(--spacing-sm);
    }
    
    .content h2 {
        font-size: 1.35rem;
    }
    
    .content h3 {
        font-size: 1.2rem;
    }
    
    li {
        padding-left: var(--spacing-md);
    }
    
    p {
        line-height: 1.7;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding: 0;
    }
    
    .container {
        box-shadow: none;
        border-radius: 0;
    }
    
    .header {
        background: var(--color-primary);
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }
    
    .divider {
        background: var(--color-border-light);
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --color-text-primary: #000000;
        --color-text-secondary: #333333;
        --color-border-light: #666666;
    }
}