/* 🎨 Uncle Grimmy's Theme Engine - Because One Size Fits Nobody */

/* 🔤 Web Font Imports - Loading High-Quality Typography */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Source+Sans+Pro:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

/* ✨ Smooth Theme Transitions - Applied to all elements */
* {
    transition: background-color 0.3s ease, 
                color 0.3s ease, 
                border-color 0.3s ease,
                box-shadow 0.3s ease,
                fill 0.3s ease,
                stroke 0.3s ease;
}

/* Preserve transitions for interactive elements */
button, a, input, select, textarea {
    transition: background-color 0.3s ease,
                color 0.3s ease,
                border-color 0.3s ease,
                box-shadow 0.3s ease,
                transform 0.2s ease,
                opacity 0.2s ease;
}

/* Base CSS Variables for Theme System */
:root {
    --primary-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --mono-font: 'JetBrains Mono', 'Fira Code', 'Monaco', 'Cascadia Code', monospace;
    
    /* Theme-specific font families */
    --font-professional: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-dark: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-corporate: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-apple: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-cybersec: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-classic: 'Playfair Display', Georgia, Times, serif;
    
    /* Animation Timing */
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Layout Constants */
    --max-width: 1200px;
    --border-radius: 8px;
    --border-radius-lg: 16px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
}

/* 🌅 LIGHT THEME - Clean and Professional */
[data-theme="light"] {
    /* Typography */
    --primary-font: var(--font-professional);
    --heading-font: var(--font-professional);
    --mono-font: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Enhanced Typography Scale */
    --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;
    --font-size-5xl: 3rem;
    
    /* Line heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Letter spacing */
    --letter-spacing-tighter: -0.05em;
    --letter-spacing-tight: -0.025em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;
    --bg-primary: #f0f8ff;
    --bg-secondary: #e6f4ff;
    --bg-tertiary: #d1ebff;
    --bg-accent: #0088ff;
    --bg-danger: #ff1744;
    --bg-success: #00e676;
    --bg-warning: #ffab00;
    
    --text-primary: #0a1929;
    --text-secondary: #1e3a5f;
    --text-muted: #4a6b8a;
    --text-inverse: #ffffff;
    
    --border-color: #b3d9ff;
    --border-focus: #0088ff;
    --shadow-sm: 0 1px 2px 0 rgb(0 136 255 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 136 255 / 0.15);
    --shadow-lg: 0 10px 15px -3px rgb(0 136 255 / 0.2);
}

/* 🌙 DARK THEME - Uncle Grimmy's Secret Underground Cyber Bunker */
[data-theme="dark"] {
    /* Cyberpunk Typography */
    --primary-font: var(--font-dark);
    --heading-font: var(--font-dark);
    --mono-font: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
    --accent-font: var(--font-cybersec);
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Enhanced Typography Scale with slightly larger sizes for dark mode */
    --font-size-xs: 0.8125rem;
    --font-size-sm: 0.9375rem;
    --font-size-base: 1.0625rem;
    --font-size-lg: 1.1875rem;
    --font-size-xl: 1.3125rem;
    --font-size-2xl: 1.5625rem;
    --font-size-3xl: 1.9375rem;
    --font-size-4xl: 2.3125rem;
    --font-size-5xl: 3.125rem;
    
    /* Cyber-style line heights */
    --line-height-tight: 1.2;
    --line-height-snug: 1.35;
    --line-height-normal: 1.45;
    --line-height-relaxed: 1.6;
    --line-height-loose: 1.9;
    
    /* Tech-style letter spacing */
    --letter-spacing-tighter: -0.03em;
    --letter-spacing-tight: -0.015em;
    --letter-spacing-normal: 0.01em;
    --letter-spacing-wide: 0.03em;
    --letter-spacing-wider: 0.06em;
    --letter-spacing-widest: 0.12em;
    --bg-primary: #000000;
    --bg-secondary: #0a0f0a;
    --bg-tertiary: #0f1a0f;
    --bg-accent: #00ff41;
    --bg-danger: #ff073a;
    --bg-success: #39ff14;
    --bg-warning: #ffaa00;
    
    --text-primary: #00ff41;
    --text-secondary: #00cc33;
    --text-muted: #008822;
    --text-inverse: #000000;
    
    --border-color: #003311;
    --border-focus: #00ff41;
    --shadow-sm: 0 1px 2px 0 rgb(0 255 65 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 255 65 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 255 65 / 0.5);
    
    /* Matrix-style glow effects */
    --glow-green: 0 0 20px rgba(0, 255, 65, 0.5);
    --glow-red: 0 0 20px rgba(255, 7, 58, 0.4);
}

/* 💼 CORPORATE THEME - LinkedIn's Anemic Little Brother */
[data-theme="corporate"] {
    /* Professional Typography */
    --primary-font: var(--font-corporate);
    --heading-font: var(--font-corporate);
    --mono-font: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Conservative Typography Scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 0.9375rem;
    --font-size-lg: 1.0625rem;
    --font-size-xl: 1.1875rem;
    --font-size-2xl: 1.4375rem;
    --font-size-3xl: 1.75rem;
    --font-size-4xl: 2.125rem;
    --font-size-5xl: 2.75rem;
    
    /* Professional line heights */
    --line-height-tight: 1.3;
    --line-height-snug: 1.4;
    --line-height-normal: 1.55;
    --line-height-relaxed: 1.7;
    --line-height-loose: 2.1;
    
    /* Corporate letter spacing */
    --letter-spacing-tighter: -0.02em;
    --letter-spacing-tight: -0.01em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.02em;
    --letter-spacing-wider: 0.04em;
    --letter-spacing-widest: 0.08em;
    --bg-primary: #f5f7fa;
    --bg-secondary: #ebeef3;
    --bg-tertiary: #dce1e8;
    --bg-accent: #0066ff;
    --bg-danger: #ff1744;
    --bg-success: #00c853;
    --bg-warning: #ffc400;
    
    --text-primary: #1a2332;
    --text-secondary: #3d4f66;
    --text-muted: #6b7a8f;
    --text-inverse: #ffffff;
    
    --border-color: #d1d9e6;
    --border-focus: #0066ff;
    --shadow-sm: 0 1px 3px 0 rgb(0 102 255 / 0.1);
    --shadow-md: 0 2px 4px -1px rgb(0 102 255 / 0.15);
    --shadow-lg: 0 4px 6px -1px rgb(0 102 255 / 0.2);
}

/* 🍎 APPLE THEME - So Clean It Squeaks */
[data-theme="apple"] {
    /* Apple-style Typography */
    --primary-font: var(--font-apple);
    --heading-font: var(--font-apple);
    --mono-font: 'SF Mono', 'Monaco', 'JetBrains Mono', monospace;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Apple Typography Scale */
    --font-size-xs: 0.6875rem;
    --font-size-sm: 0.8125rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.1875rem;
    --font-size-xl: 1.3125rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    
    /* Apple line heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.47;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Apple letter spacing */
    --letter-spacing-tighter: -0.04em;
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;
    --bg-primary: #fafafa;
    --bg-secondary: #f5f5f7;
    --bg-tertiary: #e8e8ed;
    --bg-accent: #0071e3;
    --bg-danger: #ff3b30;
    --bg-success: #30d158;
    --bg-warning: #ff9f0a;
    
    --text-primary: #1d1d1f;
    --text-secondary: #515154;
    --text-muted: #86868b;
    --text-inverse: #ffffff;
    
    --border-color: #d2d2d7;
    --border-focus: #0071e3;
    --shadow-sm: 0 1px 2px 0 rgb(0 113 227 / 0.08);
    --shadow-md: 0 2px 4px 0 rgb(0 113 227 / 0.12);
    --shadow-lg: 0 4px 8px 0 rgb(0 113 227 / 0.16);
}

/* 🛡️ CYBERSECURITY THEME - For the Real Threat Hunters */
[data-theme="cybersec"] {
    /* Cybersec Typography */
    --primary-font: var(--font-cybersec);
    --heading-font: var(--font-cybersec);
    --mono-font: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
    --accent-font: var(--mono-font);
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Cybersec Typography Scale */
    --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;
    --font-size-5xl: 3rem;
    
    /* Technical line heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;
    
    /* Monospace-friendly letter spacing */
    --letter-spacing-tighter: -0.025em;
    --letter-spacing-tight: -0.0125em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;
    --letter-spacing-widest: 0.1em;
    
    /* Cybersec Color Palette */
    --bg-primary: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #2a2a2a;
    --bg-accent: #00ff41;
    --bg-danger: #ff073a;
    --bg-success: #39ff14;
    --bg-warning: #ffaa00;
    
    --text-primary: #00ff41;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    --text-inverse: #0a0a0a;
    --text-accent: #00ff41;
    --text-code: #00ffff;
    
    --border-color: #333333;
    --border-focus: #00ff41;
    --shadow-sm: 0 1px 2px 0 rgb(0 255 65 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 255 65 / 0.2);
    --shadow-lg: 0 10px 15px -3px rgb(0 255 65 / 0.3);
    
    /* Matrix-style glow effects */
    --glow-primary: 0 0 20px rgba(0, 255, 65, 0.4);
    --glow-secondary: 0 0 15px rgba(0, 255, 255, 0.3);
    --glow-danger: 0 0 20px rgba(255, 7, 58, 0.4);
}

/* 📜 CLASSIC THEME - Academic and Elegant */
[data-theme="classic"] {
    /* Classic Typography */
    --primary-font: var(--font-classic);
    --heading-font: var(--font-classic);
    --body-font: 'Georgia', 'Times New Roman', Times, serif;
    --mono-font: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Classic Typography Scale */
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1.0625rem;
    --font-size-lg: 1.1875rem;
    --font-size-xl: 1.375rem;
    --font-size-2xl: 1.625rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.25rem;
    
    /* Classic line heights for readability */
    --line-height-tight: 1.35;
    --line-height-snug: 1.45;
    --line-height-normal: 1.6;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2.2;
    
    /* Classic letter spacing */
    --letter-spacing-tighter: -0.02em;
    --letter-spacing-tight: -0.01em;
    --letter-spacing-normal: 0.01em;
    --letter-spacing-wide: 0.03em;
    --letter-spacing-wider: 0.06em;
    --letter-spacing-widest: 0.12em;
    
    /* Vintage Computing Color Palette */
    --bg-primary: #f5f5dc;
    --bg-secondary: #eeeedd;
    --bg-tertiary: #d9d9c5;
    --bg-accent: #0066cc;
    --bg-danger: #cc3300;
    --bg-success: #009900;
    --bg-warning: #ff9900;
    
    --text-primary: #1a1a1a;
    --text-secondary: #404040;
    --text-muted: #666666;
    --text-inverse: #f5f5dc;
    --text-accent: #0066cc;
    
    --border-color: #999988;
    --border-focus: #0066cc;
    --shadow-sm: 0 1px 3px 0 rgb(0 102 204 / 0.15);
    --shadow-md: 0 4px 8px -2px rgb(0 102 204 / 0.2);
    --shadow-lg: 0 12px 20px -4px rgb(0 102 204 / 0.25);
}

/* 🎨 CUSTOM THEME - User Defined (defaults to dark with customizable accent) */
[data-theme="custom"] {
    /* Custom Typography */
    --primary-font: var(--font-dark);
    --heading-font: var(--font-dark);
    --mono-font: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --bg-primary: var(--custom-bg-primary, #0a0a0a);
    --bg-secondary: var(--custom-bg-secondary, #1a1a1a);
    --bg-tertiary: var(--custom-bg-tertiary, #2a2a2a);
    --bg-accent: var(--custom-accent, #00ff88);
    --bg-danger: var(--custom-danger, #ff1744);
    --bg-success: var(--custom-success, #00e676);
    --bg-warning: var(--custom-warning, #ffab00);
    
    --text-primary: var(--custom-text-primary, #00ff88);
    --text-secondary: var(--custom-text-secondary, #00cc66);
    --text-muted: var(--custom-text-muted, #008844);
    --text-inverse: var(--custom-text-inverse, #0a0a0a);
    
    --border-color: var(--custom-border, #004422);
    --border-focus: var(--custom-accent, #00ff88);
    --shadow-sm: 0 1px 2px 0 rgb(0 255 136 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 255 136 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 255 136 / 0.5);
}

/* 🎛️ Theme Selector Styles */
.theme-selector {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    display: flex;
    gap: var(--spacing-xs);
    background: var(--bg-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.theme-btn {
    width: 40px;
    height: 40px;
    border: 2px solid transparent;
    border-radius: var(--border-radius);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--border-focus);
}

.theme-btn.active {
    background: var(--bg-accent);
    color: var(--text-inverse);
    border-color: var(--bg-accent);
    box-shadow: var(--shadow-md);
}

/* Dark theme specific button effects */
[data-theme="dark"] .theme-btn:hover {
    box-shadow: var(--glow-cyan);
}

[data-theme="dark"] .theme-btn.active {
    box-shadow: var(--glow-cyan);
}

/* Custom Theme Color Picker (appears when custom theme is selected) */
.custom-theme-controls {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 999;
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    display: none;
    min-width: 280px;
}

.custom-theme-controls.visible {
    display: block;
}

.color-input-group {
    margin-bottom: var(--spacing-sm);
}

.color-input-group label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.color-input-group input[type="color"] {
    width: 100%;
    height: 40px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    cursor: pointer;
}

/* Responsive Theme Selector */
@media (max-width: 768px) {
    .theme-selector {
        top: 10px;
        right: 10px;
        gap: var(--spacing-xs);
    }
    
    .theme-btn {
        width: 35px;
        height: 35px;
        font-size: 14px;
    }
    
    .custom-theme-controls {
        top: 65px;
        right: 10px;
        min-width: 240px;
    }
}

/* Theme transition animations */
* {
    transition: 
        background-color var(--transition-smooth),
        color var(--transition-smooth),
        border-color var(--transition-smooth),
        box-shadow var(--transition-smooth);
}

/* Reduced motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
    }
}

/* 🎭 Theme-Specific Component Styling */

/* Dark theme special effects */
[data-theme="dark"] .hero-title,
[data-theme="dark"] h1 {
    text-shadow: var(--glow-cyan);
}

[data-theme="dark"] .feature-card:hover {
    box-shadow: var(--glow-cyan);
}

[data-theme="dark"] code,
[data-theme="dark"] pre {
    background: #1a1a1a;
    color: #00ffff;
    border: 1px solid #333;
    text-shadow: 0 0 5px rgba(0, 255, 255, 0.3);
}

/* Cybersec theme special effects */
[data-theme="cybersec"] .hero-title,
[data-theme="cybersec"] h1 {
    text-shadow: var(--glow-primary);
    font-family: var(--mono-font);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
}

[data-theme="cybersec"] .nav-menu a {
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    font-family: var(--mono-font);
}

[data-theme="cybersec"] .btn-primary {
    background: var(--bg-accent);
    box-shadow: var(--glow-primary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wide);
    font-family: var(--mono-font);
}

[data-theme="cybersec"] code,
[data-theme="cybersec"] pre {
    background: #0f0f0f;
    color: var(--text-code);
    border: 1px solid var(--bg-accent);
    text-shadow: var(--glow-secondary);
}

[data-theme="cybersec"] .feature-card {
    border: 1px solid var(--bg-accent);
    background: linear-gradient(145deg, var(--bg-secondary), var(--bg-tertiary));
}

[data-theme="cybersec"] .feature-card:hover {
    box-shadow: var(--glow-primary);
    transform: translateY(-2px);
}

/* Classic theme typography enhancements */
[data-theme="classic"] .hero-title,
[data-theme="classic"] h1 {
    font-family: var(--font-classic);
    font-weight: var(--font-weight-bold);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.1);
}

[data-theme="classic"] h2,
[data-theme="classic"] h3 {
    font-family: var(--font-classic);
    font-style: italic;
}

[data-theme="classic"] p,
[data-theme="classic"] .text-content {
    font-family: var(--body-font);
    text-align: justify;
    line-height: var(--line-height-loose);
}

[data-theme="classic"] .quote {
    font-style: italic;
    border-left: 4px solid var(--bg-accent);
    padding-left: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

[data-theme="classic"] .btn-primary {
    background: var(--bg-accent);
    border: 2px solid var(--bg-accent);
    text-transform: none;
    letter-spacing: var(--letter-spacing-normal);
    font-family: var(--font-classic);
    font-weight: var(--font-weight-medium);
}

/* Corporate theme professionalism */
[data-theme="corporate"] .hero-title,
[data-theme="corporate"] h1 {
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-tight);
}

[data-theme="corporate"] .btn-primary {
    background: var(--bg-accent);
    border-radius: 4px;
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--letter-spacing-normal);
}

[data-theme="corporate"] .feature-card {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--bg-primary);
    box-shadow: var(--shadow-sm);
}

[data-theme="corporate"] code,
[data-theme="corporate"] pre {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    font-size: 0.875rem;
}

/* Apple theme minimalism */
[data-theme="apple"] .hero-title,
[data-theme="apple"] h1 {
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-tighter);
}

[data-theme="apple"] .btn-primary {
    background: var(--bg-accent);
    border-radius: 8px;
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--letter-spacing-normal);
    border: none;
    box-shadow: var(--shadow-sm);
}

[data-theme="apple"] .feature-card {
    background: var(--bg-secondary);
    border-radius: var(--border-radius-lg);
    border: none;
    box-shadow: var(--shadow-sm);
}

[data-theme="apple"] code,
[data-theme="apple"] pre {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-radius: 6px;
    font-family: 'SF Mono', 'Monaco', 'JetBrains Mono', monospace;
}

/* Light theme clean styling */
[data-theme="light"] .hero-title,
[data-theme="light"] h1 {
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
}

[data-theme="light"] .btn-primary {
    background: var(--bg-accent);
    color: var(--text-inverse);
    font-weight: var(--font-weight-medium);
    box-shadow: var(--shadow-md);
}

[data-theme="light"] .feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

[data-theme="light"] code,
[data-theme="light"] pre {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

/* 📱 Mobile Responsiveness for Enhanced Typography */
@media (max-width: 768px) {
    [data-theme="cybersec"] h1,
    [data-theme="cybersec"] .hero-title {
        font-size: var(--font-size-3xl);
        letter-spacing: var(--letter-spacing-normal);
    }
    
    [data-theme="classic"] p,
    [data-theme="classic"] .text-content {
        text-align: left;
        line-height: var(--line-height-relaxed);
    }
    
    /* Reduce font sizes for mobile */
    [data-theme="classic"] h1 { font-size: var(--font-size-3xl); }
    [data-theme="classic"] h2 { font-size: var(--font-size-2xl); }
    [data-theme="classic"] h3 { font-size: var(--font-size-xl); }
}

/* 🎨 Font Loading Optimization */
@media (prefers-reduced-data: reduce) {
    /* Use system fonts for users on limited data */
    :root {
        --font-professional: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        --font-dark: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        --font-corporate: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        --font-apple: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
        --font-cybersec: 'Consolas', 'Monaco', monospace;
        --font-classic: Georgia, Times, serif;
    }
}

/* ♿ Accessibility Enhancements */

/* High contrast mode support */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
        --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
        --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
    }
    
    [data-theme="light"] {
        --text-primary: #000000;
        --text-secondary: #333333;
        --bg-primary: #ffffff;
        --border-color: #000000;
    }
    
    [data-theme="dark"] {
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --bg-primary: #000000;
        --border-color: #ffffff;
    }
}

/* Focus indicators for keyboard navigation */
.theme-btn:focus-visible {
    outline: 3px solid var(--bg-accent);
    outline-offset: 2px;
    box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 5px var(--bg-accent);
}

.theme-btn:focus:not(:focus-visible) {
    outline: none;
}

/* Ensure minimum color contrast ratios */
[data-theme="cybersec"] .text-muted,
[data-theme="dark"] .text-muted {
    color: #999999; /* Improved contrast */
}

[data-theme="classic"] .text-muted {
    color: #666666; /* Better contrast on light background */
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--bg-accent);
    color: var(--text-inverse);
    padding: 8px;
    text-decoration: none;
    border-radius: 4px;
    z-index: 10000;
    font-weight: 600;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Screen reader only content */
.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;
}

/* Font size preferences */
@media (prefers-reduced-motion: reduce) {
    /* Remove glow effects for users who prefer reduced motion */
    [data-theme="dark"] .hero-title,
    [data-theme="dark"] h1,
    [data-theme="cybersec"] .hero-title,
    [data-theme="cybersec"] h1 {
        text-shadow: none;
    }
    
    [data-theme="dark"] .theme-btn:hover,
    [data-theme="dark"] .theme-btn.active,
    [data-theme="cybersec"] .feature-card:hover,
    [data-theme="cybersec"] .btn-primary {
        box-shadow: none;
    }
}

/* Print styles */
@media print {
    /* Ensure good contrast for printing */
    * {
        background: white !important;
        color: black !important;
        text-shadow: none !important;
        box-shadow: none !important;
    }
    
    .theme-selector,
    .custom-theme-controls,
    .theme-preview-tooltip {
        display: none !important;
    }
    
    body {
        font-family: Georgia, Times, serif;
        font-size: 12pt;
        line-height: 1.5;
    }
    
    h1, h2, h3, h4, h5, h6 {
        font-family: Arial, sans-serif;
        page-break-after: avoid;
    }
    
    p, ul, ol {
        orphans: 3;
        widows: 3;
    }
}

/* 📊 Performance Optimizations */

/* Preload font display swap for faster loading */
@font-face {
    font-display: swap;
}

/* Reduce layout shifts during font loading */
body {
    font-display: swap;
}

/* Optimize animations for better performance */
@media (prefers-reduced-motion: no-preference) {
    .theme-btn {
        will-change: transform, box-shadow;
    }
    
    .theme-btn:hover {
        transform: translateY(-1px);
    }
}