/* FINSYNTAX Design Tokens
   Mobile-First & Premium Light Mode (Soft Warm Slate) for Long-Form Financial News Reading */

:root {
  /* =========================================
     1. Color Palette (Optimized High Contrast & Reduced Eye Strain)
     ========================================= */
  
  /* Brand Colors */
  --color-primary: #10B981; /* Emerald Green (เขียวมรกต) */
  --color-primary-hover: #059669;
  --color-secondary: #6366F1; /* Electric Indigo (ม่วงอินดิโก้นีออน) */
  --color-secondary-hover: #4F46E5;
  
  /* Semantic Status & Accents */
  --color-accent-amber: #D97706; /* Highlights & Warnings */
  --color-accent-rose: #E11D48; /* Bearish & Danger */
  --color-accent-cyan: #0284C7; /* Ocean Blue Data */
  --color-accent-teal: #0D9488; /* Sustainability Teal */
  
  /* Backgrounds & Surfaces */
  --color-bg-base: #F8FAFC; /* Slate Pearl Off-White */
  --color-bg-surface: #FFFFFF; /* Pure White Surface */
  --color-bg-surface-hover: #F1F5F9; /* Surface Hover */
  --color-bg-article: #FFFFFF; /* Article Surface */
  
  /* Text & Contrast Hierarchy */
  --color-text-title: #0F172A; /* Deep Slate 900 */
  --color-text-body: #334155; /* Soft Slate 700 */
  --color-text-secondary: #475569; /* Subtitle Slate 600 */
  --color-text-muted: #64748B; /* Metadata Slate 500 */
  
  /* Borders & Dividers */
  --color-border: rgba(15, 23, 42, 0.10);
  --color-border-subtle: rgba(15, 23, 42, 0.05);
  --color-border-highlight: rgba(99, 102, 241, 0.35); /* AI Highlight Border */

  /* =========================================
     2. Typography System (Dual Font Pairing for Maximum Readability)
     ========================================= */
  
  /* Headings, Badges, UI Navigation -> Modern loopless, high impact */
  --font-family-heading: 'Prompt', -apple-system, BlinkMacSystemFont, sans-serif;
  
  /* Long-form Article Body -> Ultra-legible for extended reading */
  --font-family-body: 'IBM Plex Sans Thai', 'Prompt', sans-serif;
  
  /* Financial Numbers & English Data -> Tabular numbers & clear glyph distinction */
  --font-family-data: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-feature-numeric: 'tnum' 1, 'cv05' 1; /* Enables tabular equal-width numbers */
  
  /* Mobile-First Font Scales */
  --text-xs: 0.75rem;     /* 12px - Badges, Tags */
  --text-sm: 0.875rem;    /* 14px - Meta info, Captions */
  --text-base: 1rem;      /* 16px - Base Mobile Body Text */
  --text-article: 1.0625rem; /* 17px - Optimized Body Text for Mobile Reading */
  --text-lg: 1.1875rem;   /* 19px - Card Headlines */
  --text-xl: 1.375rem;    /* 22px - Subheadings */
  --text-2xl: 1.625rem;   /* 26px - Article Main Title Mobile */
  --text-3xl: 2rem;       /* 32px - Section Headers Desktop */
  --text-4xl: 2.5rem;     /* 40px - Main Hero Titles */

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

  /* Line Heights & Letter Spacings (Reading Ergonomics) */
  --line-height-heading: 1.3;
  --line-height-body: 1.75; /* Generous spacing for comfortable Thai reading */
  --line-height-tight: 1.25;
  --letter-spacing-body: 0.012em;

  /* =========================================
     3. Spacing & Grid System
     ========================================= */
  
  --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 */
  
  --container-padding: var(--space-4); /* Mobile default */
  --article-max-width: 880px; /* Balanced desktop reading & layout width */

  /* =========================================
     4. Borders & Radius
     ========================================= */
  
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-pill: 9999px;

  /* =========================================
     5. Shadows & Glassmorphism Effects (Light Theme)
     ========================================= */
  
  --shadow-sm: 0 1px 3px 0 rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 12px -2px rgba(15, 23, 42, 0.08), 0 2px 4px -1px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
  --shadow-glow-ai: 0 4px 20px rgba(79, 70, 229, 0.12);
  
  --glass-bg: rgba(255, 255, 255, 0.88);
  --glass-blur: blur(16px);
  --glass-border: 1px solid rgba(15, 23, 42, 0.08);
}

/* =========================================
   Dark Mode (Obsidian #0B0F19)
   ========================================= */
[data-theme="dark"] {
  /* Colors that override :root in dark mode */
  --color-primary: #10B981;
  --color-primary-hover: #34D399;
  --color-secondary: #818CF8;
  --color-secondary-hover: #6366F1;

  --color-accent-amber: #F59E0B;
  --color-accent-rose: #F87171;
  --color-accent-cyan: #38BDF8;

  /* Backgrounds */
  --color-bg-base:         #0B0F19;
  --color-bg-surface:      #151C2C;
  --color-bg-surface-hover:#1E293B;
  --color-bg-article:      #111726;

  /* Text */
  --color-text-title:     #F8FAFC;
  --color-text-body:      #E2E8F0;
  --color-text-secondary: #CBD5E1;
  --color-text-muted:     #94A3B8;

  /* Borders — เพิ่ม opacity ให้เห็นขอบการ์ดชัดขึ้น */
  --color-border:           rgba(255, 255, 255, 0.18);
  --color-border-subtle:    rgba(255, 255, 255, 0.08);
  --color-border-highlight: rgba(129, 140, 248, 0.50);

  /* Shadows */
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.40);
  --shadow-md: 0 4px 12px -2px rgba(0, 0, 0, 0.50), 0 2px 4px -1px rgba(0, 0, 0, 0.30);
  --shadow-lg: 0 12px 24px -4px rgba(0, 0, 0, 0.60);
  --shadow-glow-ai: 0 4px 20px rgba(129, 140, 248, 0.20);

  --glass-bg:     rgba(21, 28, 44, 0.88);
  --glass-border: 1px solid rgba(255, 255, 255, 0.08);
}

/* =========================================
   6. Responsive Overrides (Tablet & Desktop Readability)
   ========================================= */

@media (min-width: 768px) {
  :root {
    --container-padding: var(--space-6);
    --text-article: 1.125rem; /* 18px on Tablet/Desktop for enhanced legibility */
    --text-2xl: 2rem;        /* 32px Title */
    --text-3xl: 2.5rem;      /* 40px */
    --text-4xl: 3.25rem;     /* 52px */
  }
}

@media (min-width: 1024px) {
  :root {
    --container-padding: var(--space-8);
  }
}