/**
 * Teaform 茶予 Brand Variables
 * Based on Official Brand Visual Guidelines v1.2.1
 */

:root {
  /* ============================================
     BRAND COLORS (v1.2.1 Official)
     Ratio: 55% Primary + 35% Secondary + 10% Accent
  ============================================ */

  /* Primary Color - Deep Blue Gray */
  --color-primary: #43596A;
  --color-primary-rgb: 67, 89, 106;
  --color-primary-light: #6B8299;
  --color-primary-deep: #2F3F4F;
  --color-primary-mist: #D1E0F0;

  /* Secondary Color - Gold Brown */
  --color-secondary: #DABC8A;
  --color-secondary-rgb: 218, 188, 138;
  --color-secondary-light: #EBD0A5;
  --color-secondary-deep: #BEA06E;
  --color-secondary-opacity-90: rgba(218, 188, 138, 0.9);
  --color-secondary-opacity-40: rgba(218, 188, 138, 0.4);
  --color-secondary-opacity-20: rgba(218, 188, 138, 0.2);

  /* Accent Color - Fresh Grass Green (v1.2.1) */
  --color-accent: #9FB4A3;
  --color-accent-rgb: 159, 180, 163;
  --color-accent-light: #C8DAB7;
  --color-accent-deep: #7A8C7A;

  /* Neutral Colors */
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-gray-50: #F8F9FA;
  --color-gray-100: #F1F3F5;
  --color-gray-200: #E9ECEF;
  --color-gray-300: #DEE2E6;
  --color-gray-400: #CED4DA;
  --color-gray-500: #ADB5BD;
  --color-gray-600: #6C757D;
  --color-gray-700: #495057;
  --color-gray-800: #343A40;
  --color-gray-900: #212529;

  /* Text Colors */
  --color-text-primary: #2C3E50;
  --color-text-secondary: #6C757D;
  --color-text-muted: #ADB5BD;
  --color-text-on-dark: #E8E8E8;
  --color-text-on-primary: #FFFFFF;

  /* Semantic Colors */
  --color-success: #9FB4A3;
  --color-warning: #DABC8A;
  --color-error: #E57373;
  --color-info: #64B5F6;

  /* ============================================
     TYPOGRAPHY
  ============================================ */

  /* Font Families */
  --font-family-en: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Arial", "Helvetica", sans-serif;
  --font-family-cn-serif: "Noto Serif SC", "Source Han Serif", "思源宋体", serif;
  --font-family-cn-sans: "Noto Sans SC", "Alibaba PuHuiTi", "阿里普惠体", sans-serif;
  --font-family-mono: "SF Mono", "Monaco", "Consolas", "Courier New", monospace;

  /* Font Sizes */
  --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: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  --font-size-6xl: 3.75rem;   /* 60px */
  --font-size-7xl: 4.5rem;    /* 72px */

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

  /* Line Heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Letter Spacing */
  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.05em;
  --letter-spacing-wider: 0.1em;

  /* ============================================
     SPACING (8px Grid System)
  ============================================ */

  --spacing-0: 0;
  --spacing-1: 0.25rem;  /* 4px */
  --spacing-2: 0.5rem;   /* 8px */
  --spacing-3: 0.75rem;  /* 12px */
  --spacing-4: 1rem;     /* 16px */
  --spacing-5: 1.25rem;  /* 20px */
  --spacing-6: 1.5rem;   /* 24px */
  --spacing-8: 2rem;     /* 32px */
  --spacing-10: 2.5rem;  /* 40px */
  --spacing-12: 3rem;    /* 48px */
  --spacing-16: 4rem;    /* 64px */
  --spacing-20: 5rem;    /* 80px */
  --spacing-24: 6rem;    /* 96px */
  --spacing-32: 8rem;    /* 128px */

  /* Container Margins */
  --page-margin-sm: var(--spacing-6);   /* 24px */
  --page-margin-md: var(--spacing-8);   /* 32px */
  --page-margin-lg: var(--spacing-12);  /* 48px */
  --page-margin-xl: var(--spacing-20);  /* 80px */

  /* ============================================
     LAYOUT
  ============================================ */

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

  /* Grid */
  --grid-columns: 12;
  --grid-gap: var(--spacing-6);
  --grid-gap-sm: var(--spacing-4);
  --grid-gap-lg: var(--spacing-8);

  /* Border Radius */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.5rem;   /* 8px */
  --radius-lg: 0.75rem;  /* 12px */
  --radius-xl: 1rem;     /* 16px */
  --radius-full: 9999px;

  /* ============================================
     COMPONENTS
  ============================================ */

  /* Header */
  --header-height: 72px;
  --header-height-sm: 64px;
  --header-bg: rgba(67, 89, 106, 0.95);
  --header-scrolled-bg: rgba(67, 89, 106, 1);

  /* Buttons */
  --button-height-sm: 36px;
  --button-height-md: 44px;
  --button-height-lg: 52px;
  --button-padding-x: var(--spacing-6);

  /* Cards */
  --card-padding: var(--spacing-6);
  --card-radius: var(--radius-lg);
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --card-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

  /* Forms */
  --form-input-height: 44px;
  --form-input-padding-x: var(--spacing-4);
  --form-border-color: var(--color-gray-300);
  --form-border-focus: var(--color-secondary);
  --form-error: var(--color-error);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  --transition-slower: 500ms ease;

  /* Easing */
  --ease-out: cubic-bezier(0.215, 0.61, 0.355, 1);
  --ease-in-out: cubic-bezier(0.645, 0.045, 0.355, 1);

  /* 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;
}

/* Dark Mode Support (Future) */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text-primary: #E8E8E8;
    --color-text-secondary: #ADB5BD;
    --color-gray-50: #212529;
    --color-gray-100: #343A40;
  }
}