/* ========================================
   CSS Variables & Theme System
   Tokens aligned with AppTheme.swift
   ======================================== */
:root {
    --primary: #0F8A4A;
    --primary-light: #12a058;
    --background: #FFFFFF;
    --card-bg: #FFFFFF;
    --elevated-surface: #F5F5F5;
    --light-green: #E8F5E9;
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --border: #E5E5E5;
    --shadow: rgba(0, 0, 0, 0.08);
    --shadow-strong: rgba(15, 138, 74, 0.15);
    --header-bg: rgba(255, 255, 255, 0.85);
    --footer-bg: #1A1A1A;
    --footer-text: #FFFFFF;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 32px;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

[data-theme="dark"] {
    --primary: #2EB259;
    --primary-light: #3dd170;
    --background: #121212;
    --card-bg: #1C1C1E;
    --elevated-surface: #2A2A2A;
    --light-green: #1A3D2A;
    --text-primary: #FAFAFA;
    --text-secondary: #999999;
    --border: #383838;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-strong: rgba(46, 178, 89, 0.25);
    --header-bg: rgba(18, 18, 18, 0.85);
    --footer-bg: #0A0A0A;
    --footer-text: #FFFFFF;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Bricolage Grotesque', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ========================================
   Header (subpages)
   ======================================== */
.header {
    position: sticky;
    top: 0;
    background: var(--header-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 100;
    padding: var(--space-md) var(--space-xl);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.back-link:hover {
    opacity: 0.8;
    transform: translateX(-3px);
}

.back-link svg {
    width: 20px;
    height: 20px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--primary);
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-link img {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
}

/* ========================================
   Theme Toggle
   ======================================== */
.theme-toggle {
    background: var(--elevated-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    transition: all var(--transition-fast);
    color: var(--text-primary);
}

.theme-toggle:hover {
    background: var(--light-green);
    border-color: var(--primary);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.sun-icon { display: none; }
.moon-icon { display: block; }
[data-theme="dark"] .sun-icon { display: block; }
[data-theme="dark"] .moon-icon { display: none; }

/* ========================================
   Typography
   ======================================== */
h1 {
    color: var(--primary);
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

h2 {
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: var(--space-xl);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 2px solid var(--light-green);
}

h2:first-child {
    margin-top: 0;
}

h3 {
    color: var(--text-primary);
    font-size: 1.15rem;
    font-weight: 600;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

h4 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    margin-top: var(--space-md);
    margin-bottom: var(--space-sm);
}

p {
    margin-bottom: var(--space-md);
    color: var(--text-secondary);
}

ul {
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
}

li {
    margin-bottom: var(--space-sm);
    color: var(--text-secondary);
}

li strong {
    color: var(--text-primary);
}

strong {
    color: var(--text-primary);
    font-weight: 600;
}

a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    transition: opacity var(--transition-fast);
}

a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* ========================================
   Content Layout (subpages)
   ======================================== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-2xl) var(--space-xl);
}

.page-header {
    margin-bottom: var(--space-2xl);
}

.last-updated {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.content-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: 0 4px 20px var(--shadow);
    transition: background-color var(--transition-normal), border-color var(--transition-normal);
}

.platform-section {
    background: var(--elevated-surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    border-left: 4px solid var(--primary);
    transition: background-color var(--transition-normal);
}

.platform-section h3 {
    margin-top: 0;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: var(--space-xl) 0;
}

/* ========================================
   Footer (subpages)
   ======================================== */
.footer {
    text-align: center;
    padding-top: var(--space-lg);
    margin-top: var(--space-xl);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.copyright {
    color: var(--text-secondary);
    font-size: 0.85rem;
    opacity: 0.8;
}

/* ========================================
   Responsive (subpages)
   ======================================== */
@media (max-width: 768px) {
    .header {
        padding: var(--space-md);
    }

    .header-content {
        gap: var(--space-sm);
    }

    .logo-link span {
        display: none;
    }

    .container {
        padding: var(--space-lg) var(--space-md);
    }

    .content-card {
        padding: var(--space-lg);
        border-radius: var(--radius-lg);
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .platform-section {
        padding: var(--space-md);
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
    }
}