/* ===== CSS VARIABLES & THEME CONFIGURATION ===== */

/* ===== RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

img {
    max-width: 100%;
    height: auto;
}

a {
    text-decoration: none;
    color: inherit;
}

/* ===== LIGHT THEME VARIABLES ===== */
:root {
    /* Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary-color: #64748b;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* Backgrounds */
    --bg-primary: #ffffff;
    --bg-primary-rgb: 255, 255, 255;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-dark: #0f172a;
    --bg-hover: rgba(99, 102, 241, 0.05);
    
    /* Text */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Spacing - giảm khoảng cách */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 0.75rem;  /* giảm từ 1rem */
    --space-lg: 1rem;     /* giảm từ 1.5rem */
    --space-xl: 1.5rem;   /* giảm từ 2rem */
    --space-2xl: 2rem;    /* giảm từ 3rem */
    --space-3xl: 2.5rem;  /* giảm từ 4rem */
    
    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    
    /* Typography */
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    
    /* Feature Colors */
    --feature-color-1: #3b82f6;
    --feature-color-1-hover: #1e40af;
    --feature-color-2: #10b981;
    --feature-color-2-hover: #059669;
    --feature-color-3: #f59e0b;
    --feature-color-3-hover: #d97706;
    --feature-color-4: #ef4444;
    --feature-color-4-hover: #dc2626;
    --feature-color-5: #8b5cf6;
    --feature-color-5-hover: #7c3aed;
    --feature-color-6: #06b6d4;
    --feature-color-6-hover: #0891b2;
}

/* ===== DARK THEME VARIABLES ===== */
[data-theme="dark"] {
    /* Colors */
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --secondary-color: #94a3b8;
    --accent-color: #0ea5e9;
    
    /* Backgrounds */
    --bg-primary: #0f172a;
    --bg-primary-rgb: 15, 23, 42;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-hover: rgba(99, 102, 241, 0.1);
    
    /* Text */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
    --text-light: #ffffff;
    
    /* Shadows (darker for dark theme) */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3), 0 2px 4px -2px rgb(0 0 0 / 0.3);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
}