/* ==========================================================================
   Tvaris Labs — design tokens
   SINGLE SOURCE OF TRUTH. Playbook 00 §6 / 07.

   No hard-coded colour, radius, spacing or type value may appear in any
   template. Enforced by scripts/check-design-invariants.py.

   Palette rationale + contrast status: docs/SITE-REDESIGN-DESIGN-2026-08-13.md
   Verified by scripts/check-contrast.py — do not edit values without re-running.
   ========================================================================== */

:root {
  /* ---- Colour: warm charcoal, evergreen accent -------------------------- */
  /* Deliberately NOT blue-black + violet. See design doc §4.               */
  --color-bg:         #0E0D0B;
  --color-surface:    #171613;
  --color-surface-2:  #201E1A;

  --color-ink:        #EDEAE3;  /* never #FFF on near-black — playbook 07 */
  --color-ink-2:      #B3ACA0;
  --color-ink-3:      #948D80;

  --color-line:       rgba(237, 234, 227, 0.10);
  --color-line-2:     rgba(237, 234, 227, 0.18);
  /* Interactive boundaries (button/input outlines) need 3:1 against --color-bg
     per WCAG 2.2 SC 1.4.11. The translucent lines above do NOT clear that bar
     and must never be used as the only edge of a control. */
  --color-line-ui:    #6A6459;

  --color-accent:     #6FC49E;  /* evergreen — primary CTA, one highlight/screen */
  --color-accent-ink: #0E0D0B;  /* text ON accent */
  --color-signal:     #E4915A;  /* burnt sienna — constraints section only */

  /* ---- Spacing: strict 4px grid ---------------------------------------- */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  40px;
  --space-8:  48px;
  --space-10: 64px;
  --space-12: 80px;
  --space-16: 112px;

  /* ---- Radius ----------------------------------------------------------- */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-pill: 999px;

  /* ---- Type: one display, one body, one mono --------------------------- */
  --font-display: "Fraunces", Georgia, serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;

  --type-hero:    clamp(38px, 6vw, 64px);
  --type-h1:      clamp(32px, 4.5vw, 46px);
  --type-h2:      clamp(24px, 3vw, 32px);
  --type-h3:      19px;
  --type-body:    16px;
  --type-small:   14px;
  --type-micro:   13px;

  --leading-tight: 1.12;
  --leading-snug:  1.3;
  --leading-body:  1.65;

  --tracking-tight: -0.02em;
  --tracking-wide:  0.08em;

  /* ---- Motion ----------------------------------------------------------- */
  --ease-apple:  cubic-bezier(0.16, 1, 0.3, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --dur-fast:    0.15s;
  --dur-medium:  0.35s;

  /* ---- Layout ----------------------------------------------------------- */
  --measure:   1120px;
  --measure-narrow: 720px;
  --tap-min:   44px;   /* Apple HIG + WCAG 2.5.5 */
}

/* ==========================================================================
   Base
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--type-body);
  line-height: var(--leading-body);
  font-feature-settings: "cv11", "ss03";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  margin: 0;
}

p { margin: 0; }

img { max-width: 100%; display: block; }

::selection { background: var(--color-accent); color: var(--color-accent-ink); }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   Layout primitives
   ========================================================================== */

.wrap {
  width: 100%;
  max-width: var(--measure);
  margin: 0 auto;
  padding-inline: var(--space-5);
}

.wrap-narrow {
  width: 100%;
  max-width: var(--measure-narrow);
  margin: 0 auto;
  padding-inline: var(--space-5);
}

.section { padding-block: var(--space-12); }

.section-alt {
  background: var(--color-surface);
  border-block: 1px solid var(--color-line);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--type-micro);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-ink-3);
  margin-bottom: var(--space-4);
}

.section-title { font-size: var(--type-h2); margin-bottom: var(--space-3); }

.section-lede {
  font-size: var(--type-body);
  color: var(--color-ink-2);
  max-width: 62ch;
  margin-bottom: var(--space-8);
}

/* ==========================================================================
   Buttons — min 44px tap target
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--tap-min);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--type-small);
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-apple),
              background var(--dur-fast) var(--ease-smooth),
              border-color var(--dur-fast) var(--ease-smooth);
}

.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--color-accent); color: var(--color-accent-ink); }
.btn-primary:hover { background: var(--color-ink); }

.btn-ghost { border-color: var(--color-line-ui); color: var(--color-ink); }
.btn-ghost:hover { border-color: var(--color-ink-2); background: var(--color-surface-2); }

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}

.card-title { font-size: var(--type-h3); margin-bottom: var(--space-3); }
.card-body  { font-size: var(--type-small); color: var(--color-ink-2); }

.grid { display: grid; gap: var(--space-5); }
@media (min-width: 760px)  { .grid-2 { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1000px) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }