/* ============================================================
   SHELDONMARTIN.COM — Design Tokens
   Palette: Pale sky-blue/slate surfaces, navy accent — 
   evokes precision, trust, and clean digital craft.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&family=Instrument+Serif:ital@0;1&display=swap');

:root,
[data-theme='light'] {
  /* Surfaces — pale slate-white */
  --color-bg:            #F5F7FA;
  --color-surface:       #FFFFFF;
  --color-surface-2:     #EEF1F6;
  --color-surface-offset:#E4E9F2;
  --color-divider:       #D3D9E4;
  --color-border:        #C8D0DF;

  /* Text */
  --color-text:          #1A2035;
  --color-text-muted:    #5A6585;
  --color-text-faint:    #A0AAC0;
  --color-text-inverse:  #F5F7FA;

  /* Primary Accent — deep slate navy */
  --color-primary:       #1E3A6E;
  --color-primary-hover: #162D58;
  --color-primary-active:#0E2040;
  --color-primary-light: #D0DBEF;

  /* Secondary Accent — sky blue (links, highlights) */
  --color-accent:        #2F7EB8;
  --color-accent-hover:  #2268A0;
  --color-accent-light:  #D6EBF8;

  /* Semantic */
  --color-success:       #2D7D46;
  --color-error:         #C0392B;
  --color-warning:       #D47B00;

  /* Radius */
  --radius-sm:  0.375rem;
  --radius-md:  0.5rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1.25rem;
  --radius-full:9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-interactive: 200ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(26,32,53,0.07);
  --shadow-md: 0 4px 16px rgba(26,32,53,0.09);
  --shadow-lg: 0 12px 40px rgba(26,32,53,0.12);

  /* Content widths */
  --content-narrow:  640px;
  --content-default: 960px;
  --content-wide:   1200px;

  /* Fonts */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body:    'DM Sans', 'Helvetica Neue', sans-serif;
}

/* Type Scale */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --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,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);
}

/* Spacing (4px base) */
:root {
  --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;
}

/* Dark mode */
[data-theme='dark'] {
  --color-bg:            #111827;
  --color-surface:       #1A2235;
  --color-surface-2:     #222D42;
  --color-surface-offset:#1E2940;
  --color-divider:       #2D3A52;
  --color-border:        #334160;
  --color-text:          #E2E8F4;
  --color-text-muted:    #8895B2;
  --color-text-faint:    #4D5A78;
  --color-text-inverse:  #1A2035;
  --color-primary:       #6B96D6;
  --color-primary-hover: #89AEDE;
  --color-primary-light: #1E2D4A;
  --color-accent:        #5DB3E8;
  --color-accent-hover:  #7EC5EF;
  --color-accent-light:  #1A2D40;
  --color-success:       #52C174;
  --color-error:         #E85D4A;
  --color-warning:       #F5A623;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:            #111827;
    --color-surface:       #1A2235;
    --color-surface-2:     #222D42;
    --color-surface-offset:#1E2940;
    --color-divider:       #2D3A52;
    --color-border:        #334160;
    --color-text:          #E2E8F4;
    --color-text-muted:    #8895B2;
    --color-text-faint:    #4D5A78;
    --color-text-inverse:  #1A2035;
    --color-primary:       #6B96D6;
    --color-primary-hover: #89AEDE;
    --color-primary-light: #1E2D4A;
    --color-accent:        #5DB3E8;
    --color-accent-hover:  #7EC5EF;
    --color-accent-light:  #1A2D40;
    --color-success:       #52C174;
    --color-error:         #E85D4A;
    --color-warning:       #F5A623;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.45);
  }
}