/* ============================================================
   VoltaVPN — Foundation tokens (VoltaServices design system)
   ------------------------------------------------------------
   Inherited from the canonical VoltaServices brand system
   (volta-gateway-V2/docs/design/voltaservices-brand-system.md).

   Two surfaces, one type system, one accent — inverted:
     data-surface="marketing"  → light, editorial
     data-surface="product"    → dark, dense, terminal-adjacent

   VPN re-hues the accent ONLY: a "connected" emerald green
   (bluer than VoltaAI's grass green). Single accent, state-only:
   it never lands on a button or a heading. Never hardcode a hex
   in component or page CSS — consume the token.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ============================================================
   1. SHARED — type, motion, radius, scale (surface-agnostic)
   ============================================================ */

:root {
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', ui-monospace, monospace;

  --t-xs:   11px;
  --t-sm:   13px;
  --t-base: 15px;
  --t-md:   17px;
  --t-lg:   21px;
  --t-h6:   24px;
  --t-h5:   30px;
  --t-h4:   38px;
  --t-h3:   48px;
  --t-h2:   64px;
  --t-h1:   96px;

  --lh-tight: 1.08;
  --lh-snug:  1.25;
  --lh-base:  1.55;
  --lh-loose: 1.75;

  --tracking-tight:   -0.03em;
  --tracking-base:    0;
  --tracking-mono:    0.02em;
  --tracking-eyebrow: 0.12em;

  --s-1: 4px;   --s-2: 8px;   --s-3: 12px;  --s-4: 16px;
  --s-5: 20px;  --s-6: 24px;  --s-8: 32px;  --s-10: 40px;
  --s-12: 48px; --s-16: 64px; --s-20: 80px; --s-24: 96px;

  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 10px;
  --r-pill: 999px;

  --dur-fast:   120ms;
  --dur-base:   180ms;
  --dur-slow:   260ms;
  --ease-out:   cubic-bezier(0.22, 1, 0.36, 1);
  --ease-in:    cubic-bezier(0.55, 0, 1, 0.45);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Status — same semantic colours both surfaces, tweaked per-surface in §3 */
  --warn:    #B45309;
  --danger:  #B91C1C;
  --info:    #1D4ED8;
}

/* ============================================================
   2. MARKETING SURFACE — light, editorial
   ============================================================ */

[data-surface="marketing"] {
  /* Paper */
  --paper-0:   #FFFFFF;
  --paper-50:  #FAFAFA;
  --paper-100: #F4F4F5;
  --paper-200: #E4E4E7;
  --paper-300: #D4D4D8;

  /* Ink */
  --ink-900: #0A0A0A;
  --ink-700: #27272A;
  --ink-500: #52525B;
  --ink-400: #71717A;
  --ink-300: #A1A1AA;

  /* Accent — VPN "connected" emerald, WCAG-AA on white at 14px+ */
  --signal:        #047857;
  --signal-soft:   #D1FAE5;
  --signal-strong: #065F46;

  --ring: rgba(4, 120, 87, 0.45);

  --hairline:        1px solid var(--paper-200);
  --hairline-strong: 1px solid var(--paper-300);
  --shadow-float:    0 12px 40px -8px rgba(0, 0, 0, 0.12),
                     0 0 0 1px rgba(0, 0, 0, 0.04);

  color-scheme: light;
}

[data-surface="marketing"] body,
[data-surface="marketing"] {
  background: var(--paper-50);
  color: var(--ink-900);
  font-family: var(--font-sans);
}

/* ============================================================
   3. PRODUCT SURFACE — dark, dense, terminal-adjacent
   ============================================================ */

[data-surface="product"] {
  /* Paper (dark — "ink" of the room) */
  --paper-0:   #0A0A0A;
  --paper-50:  #0F0F0F;
  --paper-100: #161616;
  --paper-200: #1F1F1F;
  --paper-300: #2A2A2A;

  /* Ink (light text on dark paper) */
  --ink-900: #FAFAFA;
  --ink-700: #E4E4E7;
  --ink-500: #A1A1AA;
  --ink-400: #71717A;
  --ink-300: #52525B;

  --signal:        #34D399;
  --signal-soft:   rgba(52, 211, 153, 0.10);
  --signal-strong: #10B981;

  --warn:   #F59E0B;
  --danger: #F87171;
  --info:   #60A5FA;

  --ring: rgba(52, 211, 153, 0.5);

  --hairline:        1px solid var(--paper-300);
  --hairline-strong: 1px solid #3A3A3A;
  --shadow-float:    0 12px 40px -8px rgba(0, 0, 0, 0.6),
                     0 0 0 1px rgba(255, 255, 255, 0.04);

  color-scheme: dark;
}

[data-surface="product"] body,
[data-surface="product"] {
  background: var(--paper-50);
  color: var(--ink-900);
  font-family: var(--font-sans);
}

/* ============================================================
   4. SHARED TYPE PRIMITIVES
   ============================================================ */

[data-surface] {
  font-family: var(--font-sans);
  font-feature-settings: 'ss01', 'cv11';
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

[data-surface] body { margin: 0; font-size: var(--t-md); line-height: var(--lh-base); }

[data-surface] .eyebrow,
[data-surface] [data-eyebrow] {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--ink-500);
  margin: 0;
}

[data-surface] .mono     { font-family: var(--font-mono); }
[data-surface] .tabular  { font-variant-numeric: tabular-nums; }

[data-surface] h1, [data-surface] h2, [data-surface] h3,
[data-surface] h4, [data-surface] h5, [data-surface] h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
  color: var(--ink-900);
  margin: 0;
}

[data-surface] p { margin: 0; }
[data-surface] a { color: inherit; }

[data-surface="marketing"] .h-display {
  font-size: clamp(48px, 9vw, 144px);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-tight);
}

[data-surface] :focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

[data-surface] ::selection {
  background: var(--signal-soft);
  color: var(--ink-900);
}

/* Scrollbars — minimal */
[data-surface] ::-webkit-scrollbar       { width: 8px; height: 8px; }
[data-surface] ::-webkit-scrollbar-track { background: transparent; }
[data-surface] ::-webkit-scrollbar-thumb {
  background: var(--paper-300);
  border-radius: var(--r-pill);
}
[data-surface] ::-webkit-scrollbar-thumb:hover {
  background: var(--ink-400);
}

/* Skip link */
[data-surface] .skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  background: var(--ink-900);
  color: var(--paper-0);
  padding: 10px 16px;
  border-radius: var(--r-md);
  font: 500 var(--t-sm) var(--font-sans);
}
[data-surface] .skip-link:focus { left: var(--s-4); top: var(--s-4); }

[data-surface] .sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  [data-surface] *,
  [data-surface] *::before,
  [data-surface] *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}