/* Art direction: Modern SaaS platform — dark mode, neon blue accents
   Palette: Deep charcoal backgrounds, neon blue (#0EA5E9) primary, cool grays
   Typography: Inter — clean, geometric, high-contrast SaaS standard
   Density: Feature-card layout, glassmorphism nav, 12px rounded corners */

/* ============================================================
   TYPE SCALE
   ============================================================ */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.8125rem);
  --text-sm:   clamp(0.8125rem, 0.78rem + 0.25vw, 0.9375rem);
  --text-base: clamp(0.9375rem, 0.9rem  + 0.25vw, 1.0625rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.25rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    4.5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    7rem);

  /* SPACING — 4px base */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* FONTS */
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* RADIUS — 12px base per user request */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* TRANSITIONS */
  --transition-interactive: 200ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  /* CONTENT WIDTHS */
  --content-narrow: 720px;
  --content-default: 960px;
  --content-wide: 1240px;
  --content-full: 100%;

  /* GLASSMORPHISM */
  --glass-bg: rgba(17, 20, 28, 0.72);
  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-blur: 20px;

  /* NEON GLOW */
  --neon-glow-sm: 0 0 8px rgba(14, 165, 233, 0.25);
  --neon-glow-md: 0 0 16px rgba(14, 165, 233, 0.3);
  --neon-glow-lg: 0 0 32px rgba(14, 165, 233, 0.2);
}

/* ============================================================
   MCT DARK MODE (Default — SaaS dark aesthetic)
   Deep charcoal backgrounds, neon blue accents
   ============================================================ */
:root, [data-theme="dark"] {
  /* Surfaces — deep charcoal gradient */
  --color-bg:               #0B0E14;
  --color-surface:          #11141C;
  --color-surface-2:        #161A24;
  --color-surface-offset:   #1C2030;
  --color-surface-offset-2: #222738;
  --color-surface-dynamic:  #282E40;
  --color-divider:          rgba(255, 255, 255, 0.06);
  --color-border:           rgba(255, 255, 255, 0.08);

  /* Text — high contrast on dark */
  --color-text:             #F0F2F5;
  --color-text-muted:       #8B92A5;
  --color-text-faint:       #565D73;
  --color-text-inverse:     #0B0E14;

  /* Primary — Neon Blue */
  --color-primary:          #0EA5E9;
  --color-primary-hover:    #38BDF8;
  --color-primary-active:   #0284C7;
  --color-primary-highlight: rgba(14, 165, 233, 0.1);

  /* Secondary — Cool Slate */
  --color-secondary:        #64748B;
  --color-secondary-hover:  #94A3B8;
  --color-secondary-active: #475569;

  /* Accent — Electric Cyan */
  --color-accent:           #22D3EE;
  --color-accent-hover:     #67E8F9;
  --color-accent-active:    #06B6D4;
  --color-accent-highlight: rgba(34, 211, 238, 0.08);

  /* Category colors — vivid on dark */
  --color-cat-news:         #0EA5E9;
  --color-cat-commentary:   #A78BFA;
  --color-cat-coffee:       #F59E0B;
  --color-cat-breaking:     #EF4444;
  --color-cat-developing:   #F97316;
  --color-cat-update:       #22C55E;

  /* Shadows — dark mode elevation */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4), 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5), 0 4px 12px rgba(0, 0, 0, 0.3);
}

/* ============================================================
   MCT LIGHT MODE
   ============================================================ */
[data-theme="light"] {
  --color-bg:               #F8FAFC;
  --color-surface:          #FFFFFF;
  --color-surface-2:        #F1F5F9;
  --color-surface-offset:   #E2E8F0;
  --color-surface-offset-2: #CBD5E1;
  --color-surface-dynamic:  #94A3B8;
  --color-divider:          rgba(0, 0, 0, 0.06);
  --color-border:           rgba(0, 0, 0, 0.1);

  --color-text:             #0F172A;
  --color-text-muted:       #64748B;
  --color-text-faint:       #94A3B8;
  --color-text-inverse:     #F8FAFC;

  --color-primary:          #0284C7;
  --color-primary-hover:    #0369A1;
  --color-primary-active:   #075985;
  --color-primary-highlight: rgba(2, 132, 199, 0.08);

  --color-secondary:        #64748B;
  --color-secondary-hover:  #475569;
  --color-secondary-active: #334155;

  --color-accent:           #0891B2;
  --color-accent-hover:     #0E7490;
  --color-accent-active:    #155E75;
  --color-accent-highlight: rgba(8, 145, 178, 0.06);

  --color-cat-news:         #0284C7;
  --color-cat-commentary:   #7C3AED;
  --color-cat-coffee:       #D97706;
  --color-cat-breaking:     #DC2626;
  --color-cat-developing:   #EA580C;
  --color-cat-update:       #16A34A;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.06);

  --glass-bg: rgba(255, 255, 255, 0.72);
  --glass-border: rgba(0, 0, 0, 0.06);
}

/* System preference fallback */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg:               #F8FAFC;
    --color-surface:          #FFFFFF;
    --color-surface-2:        #F1F5F9;
    --color-surface-offset:   #E2E8F0;
    --color-surface-offset-2: #CBD5E1;
    --color-surface-dynamic:  #94A3B8;
    --color-divider:          rgba(0, 0, 0, 0.06);
    --color-border:           rgba(0, 0, 0, 0.1);
    --color-text:             #0F172A;
    --color-text-muted:       #64748B;
    --color-text-faint:       #94A3B8;
    --color-text-inverse:     #F8FAFC;
    --color-primary:          #0284C7;
    --color-primary-hover:    #0369A1;
    --color-primary-active:   #075985;
    --color-primary-highlight: rgba(2, 132, 199, 0.08);
    --color-secondary:        #64748B;
    --color-secondary-hover:  #475569;
    --color-secondary-active: #334155;
    --color-accent:           #0891B2;
    --color-accent-hover:     #0E7490;
    --color-accent-active:    #155E75;
    --color-accent-highlight: rgba(8, 145, 178, 0.06);
    --color-cat-news:         #0284C7;
    --color-cat-commentary:   #7C3AED;
    --color-cat-coffee:       #D97706;
    --color-cat-breaking:     #DC2626;
    --color-cat-developing:   #EA580C;
    --color-cat-update:       #16A34A;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1), 0 4px 12px rgba(0, 0, 0, 0.06);
    --glass-bg: rgba(255, 255, 255, 0.72);
    --glass-border: rgba(0, 0, 0, 0.06);
  }
}