/* CSS Variables */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(255, 255, 255, 0.18);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(102, 126, 234, 0.4);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 2rem;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #151520;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --card-bg: rgba(21, 21, 32, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --glow-color: rgba(102, 126, 234, 0.6);
}

* {margin: 0; padding: 0; box-sizing: border-box;}
html {scroll-behavior: smooth;}
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}
.container {max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-md);}
::-webkit-scrollbar {width: 10px;}
::-webkit-scrollbar-track {background: var(--bg-secondary);}
::-webkit-scrollbar-thumb {background: var(--accent-gradient); border-radius: 5px;}