/* ========================================
   CSS Custom Properties (Design Tokens)
   Indonesian Integrated Coking Industry Base
   ======================================== */

:root {
  /* Color Palette - Industrial Blue Theme */
  --color-primary: #1A3A5F;         /* Industrial Blue - Deep Navy */
  --color-primary-light: #2A5298;    /* Lighter Industrial Blue */
  --color-primary-dark: #0F2845;     /* Darker Navy */
  --color-secondary: #F5A623;        /* Orange Accent - Energy/Heat */
  --color-secondary-light: #FFB74D;  /* Light Orange */
  --color-secondary-dark: #E6911E;   /* Dark Orange */
  
  /* Neutral Colors */
  --color-white: #FFFFFF;
  --color-off-white: #F8F9FA;
  --color-light-gray: #E9ECEF;
  --color-medium-gray: #ADB5BD;
  --color-dark-gray: #495057;
  --color-charcoal: #212529;
  --color-black: #000000;
  
  /* Steel/Industrial Grays */
  --color-steel-100: #F1F3F5;
  --color-steel-200: #DEE2E6;
  --color-steel-300: #CED4DA;
  --color-steel-400: #ADB5BD;
  --color-steel-500: #6C757D;
  --color-steel-600: #495057;
  --color-steel-700: #343A40;
  --color-steel-800: #212529;
  
  /* Semantic Colors */
  --color-success: #28A745;
  --color-warning: #FFC107;
  --color-error: #DC3545;
  --color-info: #17A2B8;
  
  /* Typography - Chinese-optimized */
  --font-family-primary: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', 'Noto Sans SC', sans-serif;
  --font-family-heading: 'Microsoft YaHei', 'PingFang SC', 'Segoe UI', 'Noto Sans SC', sans-serif;
  --font-family-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
  
  /* Font Sizes - 90% scale for industrial style */
  --font-size-xs: 0.688rem;    /* 11px */
  --font-size-sm: 0.812rem;   /* 13px */
  --font-size-base: 0.9rem;   /* 14.4px (90%) */
  --font-size-md: 0.938rem;   /* 15px */
  --font-size-lg: 1rem;       /* 16px */
  --font-size-xl: 1.125rem;   /* 18px */
  --font-size-2xl: 1.375rem;  /* 22px */
  --font-size-3xl: 1.625rem;  /* 26px */
  --font-size-4xl: 2rem;      /* 32px */
  --font-size-5xl: 2.25rem;   /* 36px */
  --font-size-hero: 2.5rem;   /* 40px */
  
  /* 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 - Increased for Chinese text */
  --line-height-tight: 1.35;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.85;
  
  /* Spacing */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 2.5rem;   /* 40px */
  --spacing-3xl: 3.5rem;   /* 56px */
  --spacing-4xl: 5rem;     /* 80px */
  --spacing-5xl: 6rem;     /* 96px */
  
  /* Container Widths */
  --container-xs: 540px;
  --container-sm: 720px;
  --container-md: 960px;
  --container-lg: 1140px;
  --container-xl: 1280px;
  
  /* Grid */
  --grid-gap: 1.5rem;
  
  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 8px 20px rgba(0, 0, 0, 0.08), 0 4px 8px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.1), 0 8px 16px rgba(0, 0, 0, 0.06);
  
  /* Transitions */
  --transition-fast: 200ms ease;
  --transition-normal: 350ms ease;
  --transition-slow: 500ms ease;
  
  /* Z-index layers */
  --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;
  
  /* Header height */
  --header-height: 80px;
  --header-height-scrolled: 72px;
}

/* Base font - 90% scale */
html { font-size: 90%; }

/* Chinese text optimization */
body.zh-CN {
  line-height: 1.75;
  letter-spacing: 0.02em;
}