/*
 * Modern CSS Foundation and Variables
 * Modern UI Foundation for EC-CUBE Top Page
 * Implements 2024 UI trends with glassmorphism, gradients, and responsive design
 */

/* ===== CSS CUSTOM PROPERTIES (CSS VARIABLES) ===== */
:root {
  /* Primary Color Palette - Modern Purple Gradient Theme */
  --color-primary: #6C5CE7;
  --color-primary-light: #A29BFE;
  --color-primary-dark: #5A4BD4;
  --color-primary-gradient: linear-gradient(135deg, #6C5CE7 0%, #A29BFE 100%);
  --color-primary-gradient-hover: linear-gradient(135deg, #5A4BD4 0%, #8B7EFF 100%);

  /* Secondary Colors */
  --color-secondary: #00CEC9;
  --color-secondary-light: #55EFC4;
  --color-secondary-dark: #00B894;

  /* Accent Colors */
  --color-accent: #FD79A8;
  --color-accent-light: #FDCB6E;
  --color-accent-dark: #E84393;

  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-gray-50: #FAFBFC;
  --color-gray-100: #F1F3F4;
  --color-gray-200: #E8EAED;
  --color-gray-300: #DADCE0;
  --color-gray-400: #BDC1C6;
  --color-gray-500: #9AA0A6;
  --color-gray-600: #80868B;
  --color-gray-700: #5F6368;
  --color-gray-800: #3C4043;
  --color-gray-900: #202124;
  --color-black: #000000;

  /* Semantic Colors */
  --color-success: #00B894;
  --color-warning: #FDCB6E;
  --color-error: #E17055;
  --color-info: #74B9FF;

  /* Text Colors for Better Contrast */
  --color-text-primary: var(--color-gray-800);
  --color-text-secondary: var(--color-gray-600);
  --color-text-tertiary: var(--color-gray-500);

  /* Background Colors */
  --color-bg-primary: var(--color-white);
  --color-bg-secondary: var(--color-gray-50);
  --color-bg-tertiary: var(--color-gray-100);

  /* Border Colors */
  --border-primary: var(--color-gray-200);
  --border-secondary: var(--color-gray-300);
  --border-focus: var(--color-primary);

  /* Typography Scale */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  --font-family-secondary: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', monospace;

  /* Font Sizes - Fluid Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --font-size-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-base: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.25rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --font-size-3xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.5rem);
  --font-size-4xl: clamp(2.25rem, 1.9rem + 1.75vw, 3rem);
  --font-size-5xl: clamp(3rem, 2.5rem + 2.5vw, 4rem);

  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  /* 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;

  /* Spacing Scale - 8px Grid System */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  --space-32: 8rem;     /* 128px */
  --space-40: 10rem;    /* 160px */
  --space-48: 12rem;    /* 192px */
  --space-56: 14rem;    /* 224px */
  --space-64: 16rem;    /* 256px */

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 0.125rem;    /* 2px */
  --radius-base: 0.25rem;   /* 4px */
  --radius-md: 0.375rem;    /* 6px */
  --radius-lg: 0.5rem;      /* 8px */
  --radius-xl: 0.75rem;     /* 12px */
  --radius-2xl: 1rem;       /* 16px */
  --radius-3xl: 1.5rem;     /* 24px */
  --radius-full: 9999px;

  /* Shadows - Modern Layered Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);

  /* Glassmorphism Effects */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-bg-light: rgba(255, 255, 255, 0.15);
  --glass-bg-dark: rgba(0, 0, 0, 0.1);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-backdrop-filter: blur(20px) saturate(180%);
  --glass-backdrop-filter-strong: blur(40px) saturate(200%);

  /* Animation Durations */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 750ms;

  /* Animation Easings */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
  --ease-elastic: cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* Responsive Breakpoints */
  --breakpoint-sm: 640px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 1024px;
  --breakpoint-xl: 1280px;
  --breakpoint-2xl: 1536px;

  /* Container Max Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}