/* ============================================
   CSS Custom Properties - Theme Variables
   ============================================ */

:root {
    /* Light Theme (Default) */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
    
    /* Background Colors */
    --bg-base: #f8fafc;
    --bg-surface: #ffffff;
    --bg-elevated: #f1f5f9;
    --bg-hover: #e2e8f0;
    --bg-active: #dbeafe;
    --bg-overlay: rgba(15, 23, 42, 0.5);
    
    /* Text Colors */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverse: #ffffff;
    
    /* Border Colors */
    --border-default: #e2e8f0;
    --border-light: #f1f5f9;
    --border-strong: #cbd5e1;
    
    /* Accent Colors */
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-light: #dbeafe;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --accent-glow: 0 0 20px rgba(59, 130, 246, 0.3);
    
    /* Semantic Colors */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #06b6d4;
    
    /* Code Colors */
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --code-border: #334155;
    --code-line-highlight: rgba(59, 130, 246, 0.1);
    
    /* Syntax Highlighting */
    --syn-keyword: #c792ea;
    --syn-string: #c3e88d;
    --syn-number: #f78c6c;
    --syn-comment: #676e95;
    --syn-function: #82aaff;
    --syn-type: #ffcb6b;
    --syn-operator: #89ddff;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07), 0 2px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.08), 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1), 0 10px 10px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.12);
    
    /* Border Radius */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Layout */
    --header-height: 64px;
    --sidebar-width: 280px;
    --toc-width: 220px;
    --content-max-width: 960px;
    
    /* Z-index */
    --z-sidebar: 100;
    --z-header: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-tooltip: 500;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-base: #111827;
    --bg-surface: #1f2937;
    --bg-elevated: #374151;
    --bg-hover: #4b5563;
    --bg-active: #374151;
    --bg-overlay: rgba(0, 0, 0, 0.7);
    
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-tertiary: #9ca3af;
    --text-inverse: #111827;
    
    --border-default: #374151;
    --border-light: #1f2937;
    --border-strong: #4b5563;
    
    --accent-primary: #818cf8;
    --accent-hover: #6366f1;
    --accent-light: #312e81;
    --accent-gradient: linear-gradient(135deg, #818cf8 0%, #c084fc 100%);
    --accent-glow: 0 0 20px rgba(129, 140, 248, 0.3);
    
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.5);
    --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.6);
    
    --code-bg: #0d1117;
    --code-border: #21262d;
    --code-line-highlight: rgba(129, 140, 248, 0.15);
    
    --sidebar-bg: #161b22;
    --card-bg: #1a1f2e;
}

/* Sepia Theme */
[data-theme="sepia"] {
    --bg-base: #faf0e6;
    --bg-surface: #fff5ee;
    --bg-elevated: #f5deb3;
    --bg-hover: #deb887;
    --bg-active: #d2b48c;
    
    --text-primary: #3e2723;
    --text-secondary: #5d4037;
    --text-tertiary: #8d6e63;
    
    --border-default: #d2b48c;
    --border-light: #f5deb3;
    --border-strong: #c4a882;
    
    --accent-primary: #8b4513;
    --accent-hover: #6d3a0e;
    --accent-light: #f5deb3;
    --accent-gradient: linear-gradient(135deg, #8b4513 0%, #d2691e 100%);
    --accent-glow: 0 0 20px rgba(139, 69, 19, 0.3);
    
    --code-bg: #3e2723;
    --code-border: #5d4037;
}

/* Forest Theme */
[data-theme="forest"] {
    --bg-base: #0a1f0a;
    --bg-surface: #132a13;
    --bg-elevated: #1a3a1a;
    --bg-hover: #2d5a2d;
    --bg-active: #1a4a1a;
    
    --text-primary: #d4e8d4;
    --text-secondary: #a8d0a8;
    --text-tertiary: #6b9e6b;
    
    --border-default: #2d5a2d;
    --border-light: #1a3a1a;
    --border-strong: #3d6a3d;
    
    --accent-primary: #4caf50;
    --accent-hover: #66bb6a;
    --accent-light: #1a3a1a;
    --accent-gradient: linear-gradient(135deg, #4caf50 0%, #8bc34a 100%);
    --accent-glow: 0 0 20px rgba(76, 175, 80, 0.3);
    
    --code-bg: #0a1a0a;
    --code-border: #1a3a1a;
}

/* Ocean Theme */
[data-theme="ocean"] {
    --bg-base: #0a192f;
    --bg-surface: #112240;
    --bg-elevated: #1a365d;
    --bg-hover: #234e78;
    --bg-active: #1a3a5f;
    
    --text-primary: #ccd6f6;
    --text-secondary: #8892b0;
    --text-tertiary: #4a5f8a;
    
    --border-default: #1a365d;
    --border-light: #112240;
    --border-strong: #234e78;
    
    --accent-primary: #64ffda;
    --accent-hover: #45e0be;
    --accent-light: #0a2a3f;
    --accent-gradient: linear-gradient(135deg, #64ffda 0%, #48cae4 100%);
    --accent-glow: 0 0 20px rgba(100, 255, 218, 0.3);
    
    --code-bg: #0a1628;
    --code-border: #1a365d;
}

/* High Contrast Theme */
[data-theme="high-contrast"] {
    --bg-base: #000000;
    --bg-surface: #111111;
    --bg-elevated: #1a1a1a;
    --bg-hover: #333333;
    --bg-active: #004080;
    
    --text-primary: #ffffff;
    --text-secondary: #e0e0e0;
    --text-tertiary: #888888;
    
    --border-default: #444444;
    --border-light: #222222;
    --border-strong: #666666;
    
    --accent-primary: #40c4ff;
    --accent-hover: #80d8ff;
    --accent-light: #002244;
    --accent-gradient: linear-gradient(135deg, #40c4ff 0%, #ffd740 100%);
    --accent-glow: 0 0 20px rgba(64, 196, 255, 0.5);
    
    --code-bg: #000000;
    --code-border: #444444;
}

/* Neon Purple Theme - 骚紫色 */
[data-theme="neon-purple"] {
    --bg-base: #0d0015;
    --bg-surface: #1a0030;
    --bg-elevated: #2d0050;
    --bg-hover: #3d0070;
    --bg-active: #4a0080;
    --bg-overlay: rgba(13, 0, 21, 0.85);
    
    --text-primary: #f0e6ff;
    --text-secondary: #d4bfff;
    --text-tertiary: #9b6bcc;
    --text-inverse: #0d0015;
    
    --border-default: #4a0080;
    --border-light: #2d0050;
    --border-strong: #6b00b8;
    
    --accent-primary: #c044ff;
    --accent-hover: #d980ff;
    --accent-light: #3d0070;
    --accent-gradient: linear-gradient(135deg, #c044ff 0%, #ff44cc 50%, #ff6699 100%);
    --accent-glow: 0 0 25px rgba(192, 68, 255, 0.5);
    
    --color-success: #44ff88;
    --color-warning: #ffaa44;
    --color-error: #ff4466;
    --color-info: #44ccff;
    
    --shadow-xs: 0 1px 2px rgba(192, 68, 255, 0.15);
    --shadow-sm: 0 1px 3px rgba(192, 68, 255, 0.2);
    --shadow-md: 0 4px 6px rgba(192, 68, 255, 0.25);
    --shadow-lg: 0 10px 15px rgba(192, 68, 255, 0.3);
    --shadow-xl: 0 20px 25px rgba(192, 68, 255, 0.35);
    --shadow-2xl: 0 25px 50px rgba(192, 68, 255, 0.4);
    
    --code-bg: #0a0012;
    --code-border: #3d0070;
    --code-line-highlight: rgba(192, 68, 255, 0.2);
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
}

/* Cyberpunk Neon Theme - 赛博朋克霓虹 */
[data-theme="cyberpunk"] {
    --bg-base: #0a0a0a;
    --bg-surface: #111111;
    --bg-elevated: #1a1a1a;
    --bg-hover: #2a2a00;
    --bg-active: #1a3a00;
    --bg-overlay: rgba(0, 0, 0, 0.9);
    
    --text-primary: #ffe600;
    --text-secondary: #cccc00;
    --text-tertiary: #888800;
    --text-inverse: #0a0a0a;
    
    --border-default: #333300;
    --border-light: #1a1a00;
    --border-strong: #ffe600;
    
    --accent-primary: #ffe600;
    --accent-hover: #ffff44;
    --accent-light: #1a1a00;
    --accent-gradient: linear-gradient(135deg, #ffe600 0%, #ff6600 33%, #ff0066 66%, #00ffff 100%);
    --accent-glow: 0 0 15px #ffe600, 0 0 30px rgba(255, 230, 0, 0.5), 0 0 60px rgba(255, 230, 0, 0.2);
    
    --color-success: #00ff66;
    --color-warning: #ff6600;
    --color-error: #ff0066;
    --color-info: #00ffff;
    
    --shadow-xs: 0 1px 2px rgba(255, 230, 0, 0.2);
    --shadow-sm: 0 1px 3px rgba(255, 230, 0, 0.25);
    --shadow-md: 0 4px 6px rgba(255, 230, 0, 0.3);
    --shadow-lg: 0 0 20px rgba(255, 230, 0, 0.3), 0 0 40px rgba(255, 0, 102, 0.1);
    --shadow-xl: 0 0 30px rgba(255, 230, 0, 0.4), 0 0 60px rgba(0, 255, 255, 0.15);
    --shadow-2xl: 0 0 50px rgba(255, 230, 0, 0.5), 0 0 100px rgba(255, 0, 102, 0.2);
    
    --code-bg: #000000;
    --code-border: #333300;
    --code-line-highlight: rgba(255, 230, 0, 0.1);
    
    /* 霓虹字体效果 */
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
    
    /* 赛博朋克特有的圆角 - 更尖锐 */
    --radius-xs: 2px;
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    --radius-2xl: 16px;
    --radius-full: 9999px;
}