/* ============================================================
   SBI Group · Design System — Tokens
   Primary: SBI Violet (sampled from official logo)
   Sans-serif only.
   ============================================================ */

:root {
  /* — Color: Violet (PRIMARY — SBI brand) — */
  --violet-50:  oklch(0.97 0.015 295);
  --violet-100: oklch(0.93 0.030 295);
  --violet-200: oklch(0.86 0.055 295);
  --violet-300: oklch(0.76 0.080 295);
  --violet-400: oklch(0.62 0.100 295);
  --violet-500: oklch(0.50 0.110 295);
  --violet-600: oklch(0.42 0.105 295); /* base — matches logo */
  --violet-700: oklch(0.35 0.090 295);
  --violet-800: oklch(0.27 0.070 295);
  --violet-900: oklch(0.18 0.045 295);

  /* — Color: Neutrals (cool greys, low chroma) — */
  --neutral-0:   #ffffff;
  --neutral-50:  oklch(0.985 0.005 295);
  --neutral-100: oklch(0.96 0.008 295);
  --neutral-200: oklch(0.92 0.010 295);
  --neutral-300: oklch(0.84 0.012 295);
  --neutral-400: oklch(0.70 0.015 295);
  --neutral-500: oklch(0.55 0.015 295);
  --neutral-600: oklch(0.42 0.012 295);
  --neutral-700: oklch(0.30 0.010 295);
  --neutral-800: oklch(0.20 0.008 295);
  --neutral-900: oklch(0.12 0.006 295);
  --black:       #0a0a0c;

  /* Legacy/internal aliases used across the design-system pages.
     Ink = neutrals; Parchment = neutral whites/greys; Amber = violet (the new accent). */
  --ink-50:   var(--neutral-50);
  --ink-100:  var(--neutral-100);
  --ink-200:  var(--neutral-200);
  --ink-300:  var(--neutral-300);
  --ink-400:  var(--neutral-400);
  --ink-500:  var(--neutral-500);
  --ink-600:  var(--neutral-600);
  --ink-700:  var(--neutral-700);
  --ink-800:  var(--neutral-800);
  --ink-900:  var(--neutral-900);

  --parchment-50:  var(--neutral-0);
  --parchment-100: var(--neutral-50);
  --parchment-200: var(--neutral-100);
  --parchment-300: var(--neutral-200);
  --parchment-400: var(--neutral-300);

  --amber-300: var(--violet-300);
  --amber-500: var(--violet-600);
  --amber-700: var(--violet-800);

  /* — Signal — */
  --signal-success: oklch(0.62 0.13 155);
  --signal-warn:    oklch(0.74 0.16 70);
  --signal-danger:  oklch(0.55 0.18 25);

  /* — Semantic — */
  --bg:           var(--neutral-0);
  --bg-elevated:  var(--neutral-0);
  --bg-sunken:    var(--neutral-50);
  --bg-dark:      var(--violet-600); /* dark = SBI violet, not black */
  --bg-darker:    var(--violet-800);
  --bg-black:     var(--black);
  --fg:           var(--neutral-900);
  --fg-muted:     var(--neutral-500);
  --fg-subtle:    var(--neutral-400);
  --border:       var(--neutral-200);
  --border-strong:var(--neutral-300);
  --primary:      var(--violet-600);
  --primary-hover:var(--violet-700);
  --on-primary:   var(--neutral-0);
  --accent:       var(--violet-600); /* single accent — SBI violet */
  --accent-soft:  var(--violet-100);

  /* — Type (sans-serif only) — */
  --font-display: "Inter Tight", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-ui:      "Inter Tight", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --fs-12: 12px;
  --fs-13: 13px;
  --fs-14: 14px;
  --fs-15: 15px;
  --fs-16: 16px;
  --fs-18: 18px;
  --fs-20: 20px;
  --fs-24: 24px;
  --fs-30: 30px;
  --fs-36: 36px;
  --fs-48: 48px;
  --fs-64: 64px;
  --fs-80: 80px;
  --fs-96: 96px;

  /* — Spacing (4px base) — */
  --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; --s-32: 128px;

  /* — Radii — */
  --r-0: 0px; --r-1: 2px; --r-2: 4px; --r-3: 8px; --r-4: 12px; --r-pill: 999px;

  /* — Shadows — */
  --shadow-1: 0 1px 0 oklch(0.18 0.045 295 / 0.05);
  --shadow-2: 0 1px 2px oklch(0.18 0.045 295 / 0.08), 0 0 0 1px oklch(0.18 0.045 295 / 0.04);
  --shadow-3: 0 6px 16px oklch(0.18 0.045 295 / 0.10), 0 0 0 1px oklch(0.18 0.045 295 / 0.05);
  --shadow-4: 0 16px 40px oklch(0.18 0.045 295 / 0.16), 0 0 0 1px oklch(0.18 0.045 295 / 0.05);

  /* — Motion — */
  --ease-out: cubic-bezier(0.2, 0.7, 0.2, 1);
  --dur-fast: 120ms; --dur-base: 200ms; --dur-slow: 360ms;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  font-size: var(--fs-15);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: inherit; }

/* ===== Design-system shell ===== */
.ds-topbar {
  position: sticky; top: 0; z-index: 50;
  background: oklch(1 0 0 / 0.92);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between;
  padding: var(--s-3) var(--s-8);
  gap: var(--s-6);
}
.ds-mark {
  display: flex; align-items: center; gap: 12px;
  font-family: var(--font-ui); font-weight: 600;
  font-size: var(--fs-14); color: var(--fg);
  letter-spacing: -0.005em;
}
.ds-mark img { height: 32px; width: auto; }
.ds-topbar nav { display: flex; gap: var(--s-5); font-size: var(--fs-13); }
.ds-topbar nav a {
  color: var(--fg-muted); text-decoration: none;
  padding: 6px 0; position: relative; font-weight: 500;
  transition: color var(--dur-fast) var(--ease-out);
}
.ds-topbar nav a:hover { color: var(--violet-600); }
.ds-topbar nav a[aria-current="page"] { color: var(--violet-600); }
.ds-topbar nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; background: var(--violet-600);
}

.ds-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--s-12) var(--s-8);
}
.ds-eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-mono); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.18em;
  color: var(--violet-600); font-weight: 500;
  margin-bottom: var(--s-4);
}
.ds-eyebrow::before {
  content: ""; width: 32px; height: 2px; background: var(--violet-600);
}
.ds-h1 {
  font-family: var(--font-display); font-weight: 700;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.05; letter-spacing: -0.025em;
  margin: 0 0 var(--s-6); text-wrap: balance;
  max-width: 22ch; color: var(--fg);
}
.ds-h1 em { font-style: normal; color: var(--violet-600); }
.ds-lede {
  font-size: var(--fs-18); color: var(--fg-muted);
  max-width: 64ch; line-height: 1.6; margin: 0; text-wrap: pretty;
}
.ds-section {
  margin-top: var(--s-16); padding-top: var(--s-10);
  border-top: 1px solid var(--border);
}
.ds-section-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: var(--s-6);
}
.ds-section-head h2 {
  font-family: var(--font-display); font-weight: 700;
  font-size: var(--fs-30); margin: 0; letter-spacing: -0.02em;
}
.ds-section-head .ds-num {
  font-family: var(--font-mono); font-size: var(--fs-12);
  color: var(--fg-subtle); letter-spacing: 0.1em;
}
.ds-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-3);
}

/* SBI 2x2 mark glyph (kept for legacy contexts; now rendered in violet) */
.iig-mark {
  display: inline-grid;
  grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr;
  gap: 2px; width: 24px; height: 24px;
  vertical-align: middle;
}
.iig-mark span { background: var(--violet-600); border-radius: 2px; }
.iig-mark span:nth-child(2) { background: var(--violet-400); }
.iig-mark span:nth-child(3) { background: var(--violet-300); }