/* ================================
   CSS Variables & Theme
   ================================ */

:root {
    /* Colors - Light Mode */
    --color-primary: #FF6B35;
    --color-primary-dark: #E8541E;
    --color-primary-light: #FF8C61;
    --color-secondary: #2EC4B6;
    --color-accent: #6C63FF;

    --color-bg: #FFFFFF;
    --color-bg-secondary: #F8F9FA;
    --color-bg-tertiary: #E9ECEF;
    --color-surface: #FFFFFF;
    --color-surface-elevated: #FFFFFF;

    --color-text: #1A1A1A;
    --color-text-secondary: #4A4A4A;
    --color-text-tertiary: #6B7280;

    --color-border: #E5E7EB;
    --color-code-bg: #F3F4F6;

    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #FF6B35 0%, #F7931E 100%);
    --gradient-secondary: linear-gradient(135deg, #2EC4B6 0%, #6C63FF 100%);
    --gradient-text: linear-gradient(135deg, #FF6B35 0%, #F7931E 50%, #2EC4B6 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Consolas', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-bg: #0F1419;
    --color-bg-secondary: #1A1F2E;
    --color-bg-tertiary: #252A3A;
    --color-surface: #1A1F2E;
    --color-surface-elevated: #252A3A;

    --color-text: #F9FAFB;
    --color-text-secondary: #D1D5DB;
    --color-text-tertiary: #9CA3AF;

    --color-border: #374151;
    --color-code-bg: #1E2738;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
}

/* ================================
   Base Styles
   ================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ================================
   Navigation
   ================================ */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .navbar {
    background-color: rgba(15, 20, 25, 0.9);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.5rem;
    text-decoration: none;
    color: var(--color-text);
}

.fox-logo {
    font-size: 2rem;
}

.brand-name {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

.github-link {
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.github-link:hover {
    background-color: var(--color-bg-tertiary);
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.25rem;
    padding: 0.5rem;
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
    background-color: var(--color-bg-secondary);
}

.theme-toggle .moon-icon {
    display: none;
}

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

[data-theme="dark"] .theme-toggle .moon-icon {
    display: inline;
}

/* ================================
   Hero Section
   ================================ */

.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.btn {
    padding: 0.875rem 1.75rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background-color: var(--color-bg-secondary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-bg-tertiary);
}

.hero-quick-install {
    background-color: var(--color-code-bg);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-primary);
}

.hero-quick-install code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--color-text);
}

/* Code Window */
.code-window {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--color-border);
}

.window-header {
    background-color: var(--color-bg-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.window-buttons {
    display: flex;
    gap: 0.5rem;
}

.window-buttons span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--color-border);
}

.btn-close { background-color: #FF5F56 !important; }
.btn-minimize { background-color: #FFBD2E !important; }
.btn-maximize { background-color: #27C93F !important; }

.window-title {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

.code-window pre {
    margin: 0;
    padding: var(--spacing-lg);
    background-color: var(--color-code-bg);
    overflow-x: auto;
}

.code-window code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--color-text);
}

/* Syntax Highlighting */
.keyword { color: #FF6B35; font-weight: 600; }
.function { color: #2EC4B6; }
.string { color: #27AE60; }
.number { color: #6C63FF; }
.comment { color: var(--color-text-tertiary); font-style: italic; }
.type { color: #E67E22; }
.constructor { color: #9B59B6; }

/* ================================
   Features Section
   ================================ */

.features {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

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

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.feature-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.feature-code {
    background-color: var(--color-code-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: var(--spacing-md);
}

.feature-code pre {
    margin: 0;
    padding: var(--spacing-md);
}

.feature-code code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}

/* ================================
   Batteries Included Section
   ================================ */

.batteries {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-secondary);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-2xl);
    line-height: 1.7;
}

.batteries-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.battery-category {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.battery-category.highlight-category {
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.05) 0%, rgba(46, 196, 182, 0.05) 100%);
    border: 2px solid var(--color-primary-light);
    box-shadow: var(--shadow-lg);
}

.battery-category:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.battery-category h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.battery-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.battery-tag {
    display: inline-block;
    padding: 0.5rem 1rem;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border: 1px solid transparent;
}

.battery-tag:hover {
    background-color: var(--color-primary-light);
    color: white;
    transform: scale(1.05);
}

.battery-tag.featured {
    background: var(--gradient-primary);
    color: white;
    font-weight: 600;
    border: none;
}

.battery-tag.featured:hover {
    transform: scale(1.08);
    box-shadow: var(--shadow-md);
}

.category-description {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.batteries-cta {
    text-align: center;
    padding: var(--spacing-xl);
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    max-width: 900px;
    margin: 0 auto;
}

.batteries-cta p {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ================================
   Tooling Section
   ================================ */

.tooling {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
}

.tooling-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.tool-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary-light);
}

.tool-card h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.tool-card h3 code {
    background-color: var(--color-code-bg);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--color-primary);
    font-weight: 600;
}

.tool-card p {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.tool-example {
    background-color: var(--color-code-bg);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-primary);
}

.tool-example code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text);
    line-height: 1.5;
}

/* ================================
   Examples Section
   ================================ */

.examples {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-secondary);
}

.example-tabs {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-secondary);
}

.tab-btn:hover {
    background-color: var(--color-bg-tertiary);
}

.tab-btn.active {
    background: var(--gradient-primary);
    color: white;
    border-color: transparent;
}

.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

.example-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.example-code {
    background-color: var(--color-code-bg);
}

.example-code pre {
    margin: 0;
    padding: var(--spacing-xl);
    overflow-x: auto;
}

.example-code code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.7;
}

.example-description {
    padding: var(--spacing-xl);
}

.example-description h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.example-description p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.example-description ul {
    list-style: none;
    padding: 0;
}

.example-description li {
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-xs);
    position: relative;
    color: var(--color-text-secondary);
}

.example-description li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* ================================
   Install Section
   ================================ */

.install {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

.install-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.install-step {
    text-align: center;
}

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

.install-step h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.code-block {
    background-color: var(--color-code-bg);
    border-radius: var(--radius-md);
    overflow: hidden;
    text-align: left;
}

.code-block pre {
    margin: 0;
    padding: var(--spacing-md);
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
}

.install-platforms {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.install-platforms p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.version-info {
    font-size: 0.9rem;
}

/* ================================
   Community Section
   ================================ */

.community {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-secondary);
}

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

.community-card {
    background-color: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

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

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

.community-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.community-card p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.community-link {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--transition-fast);
}

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

/* ================================
   Documentation Section
   ================================ */

.documentation {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg);
}

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

.doc-card {
    background-color: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text);
    transition: all var(--transition-base);
}

.doc-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.doc-card h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.doc-card p {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ================================
   Footer
   ================================ */

.footer {
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: var(--color-text-secondary);
}

.footer-column h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    color: var(--color-text-tertiary);
    font-size: 0.9rem;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
    }

    .hero-code {
        order: -1;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .example-split {
        grid-template-columns: 1fr;
    }

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

    .nav-links {
        display: none;
    }
}

@media (max-width: 640px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

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

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

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

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

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

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

    .btn {
        text-align: center;
    }
}

/* ================================
   Animations
   ================================ */

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

.hero-content,
.hero-code,
.feature-card,
.example-content,
.install-step {
    animation: fadeIn 0.6s ease-out;
}

/* ================================
   Utilities
   ================================ */

.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }