/* CSS Variables - Sky Blue Gradient Theme */
:root {
    /* Primary Colors - Sky Blue Gradient */
    --primary-color: #4facfe;
    --primary-light: #6fc3ff;
    --primary-dark: #00a8ff;
    --secondary-color: #00f2fe;
    --accent-color: #43e97b;
    
    /* Gradient Backgrounds */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-sky: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-soft: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    --gradient-tech: linear-gradient(135deg, #4facfe 0%, #00f2fe 50%, #43e97b 100%);
    --gradient-overlay: linear-gradient(135deg, rgba(79, 172, 254, 0.9) 0%, rgba(0, 242, 254, 0.9) 100%);
    
    /* Neutral Colors */
    --white: #ffffff;
    --black: #000000;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
    
    /* Semantic Colors */
    --success-color: #43e97b;
    --warning-color: #ffd93d;
    --error-color: #ff6b9d;
    --info-color: #4facfe;
    
    /* Text Colors */
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #95a5a6;
    --text-white: #ffffff;
    
    /* Background Colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --bg-dark: #2c3e50;
    
    /* Border & Shadow */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --border-radius-xl: 30px;
    --border-color: #e9ecef;
    
    --shadow-sm: 0 2px 8px rgba(79, 172, 254, 0.1);
    --shadow-md: 0 4px 16px rgba(79, 172, 254, 0.15);
    --shadow-lg: 0 8px 32px rgba(79, 172, 254, 0.2);
    --shadow-xl: 0 16px 48px rgba(79, 172, 254, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.5rem;   /* 8px */
    --spacing-sm: 1rem;     /* 16px */
    --spacing-md: 1.5rem;   /* 24px */
    --spacing-lg: 2rem;     /* 32px */
    --spacing-xl: 3rem;     /* 48px */
    --spacing-2xl: 4rem;    /* 64px */
    --spacing-3xl: 6rem;    /* 96px */
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    
    /* Typography */
    --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-family-heading: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 2rem;      /* 32px */
    --font-size-4xl: 2.5rem;    /* 40px */
    --font-size-5xl: 3rem;      /* 48px */
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.8;
    
    /* Transition */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    
    /* Header & Footer */
    --header-height: 70px;
    --footer-height: auto;
}

/* Dark mode variables (optional) */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1a2e;
        --bg-secondary: #16213e;
        --bg-tertiary: #0f3460;
        --text-primary: #eaeaea;
        --text-secondary: #b4b4b4;
        --border-color: #2d3748;
    }
}