:root {
  /* ── Text colours ────────────────────────────────────────────────
     Every value below that is used for TEXT clears WCAG AA (4.5:1)
     against --fi-black. Ratios are computed from the specified colour
     composited on #000, which is how WCAG evaluates contrast — not
     from sampled antialiased glyph pixels. Verified by tests/contrast.test.js;
     that test fails the build if any of these regress. */
  --fi-black: #000000;
  --fi-ink: #ffffff;                              /* 21.00:1 */
  --fi-ink-soft: rgba(255, 255, 255, 0.88);       /* 15.91:1 */
  --fi-ink-muted: rgba(255, 255, 255, 0.58);      /*  6.92:1 */
  --fi-ink-ghost: rgba(255, 255, 255, 0.48);      /*  4.92:1 — was .34 (2.91:1, failed) */

  /* --fi-blue is the brand accent, used both decoratively (the period, heading
     accents, dots) and as inline link colour across 26 call sites. #3366ff sat
     at 4.485:1 — 0.015 short of AA. Rather than split the token and risk
     missing a call site, the brand blue moved one unit of green (102 -> 103),
     which is imperceptible and lifts every use above the line at once. */
  --fi-blue: #3367ff;                             /*  4.53:1 — was #3366ff (4.49:1) */
  --fi-blue-bright: #4a6fff;                      /*  5.01:1 */
  --fi-blue-soft: #5a8bff;                        /*  6.57:1 — was rgba(51,102,255,.82) (3.29:1, failed) */

  --fi-line: rgba(255, 255, 255, 0.1);
  --fi-line-strong: rgba(255, 255, 255, 0.16);
  --fi-card: rgba(255, 255, 255, 0.035);
  --fi-card-hover: rgba(255, 255, 255, 0.055);
  --fi-card-raised: rgba(255, 255, 255, 0.05);
  --fi-amber: #ff8a00;
  /* Gradient start was #007aff, which put the white button label at 4.02:1.
     #0069e0 keeps the same hue family and lifts the label to 5.13:1. */
  --fi-gradient: linear-gradient(90deg, #0069e0 0%, #6000ff 100%);
  --fi-radius-sm: 10px;
  --fi-radius-md: 14px;
  --fi-radius-pill: 9999px;
  --fi-nav-h: 68px;
  --fi-max: 1320px;
  --fi-gutter: clamp(20px, 4vw, 40px);
  --fi-sans: "Satoshi", "Inter", system-ui, sans-serif;
  --fi-mono: "IBM Plex Mono", "SF Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
}

body.fi-body {
  margin: 0;
  min-height: 100vh;
  background: var(--fi-black);
  color: var(--fi-ink);
  font-family: var(--fi-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.fi-body a {
  color: inherit;
  text-decoration: none;
}

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

.fi-shell {
  position: relative;
  overflow-x: hidden;
}

.fi-container {
  width: min(var(--fi-max), calc(100% - var(--fi-gutter) * 2));
  margin-inline: auto;
}

.fi-blue-dot {
  color: var(--fi-blue);
}

.fi-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--fi-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fi-blue-soft);
  font-weight: 500;
}

.fi-eyebrow::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--fi-blue);
  box-shadow: 0 0 8px rgba(51, 102, 255, 0.65);
  flex-shrink: 0;
}

.fi-heading-xl {
  margin: 0;
  font-size: clamp(2.75rem, 5.4vw, 4.75rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 500;
  text-transform: lowercase;
}

.fi-heading-lg {
  margin: 0;
  font-size: clamp(2rem, 3.4vw, 3.25rem);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 400;
  text-transform: lowercase;
}

.fi-lead {
  margin: 0;
  max-width: 34rem;
  color: var(--fi-ink-muted);
  font-size: 1rem;
  line-height: 1.75;
  font-weight: 400;
}

.fi-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 42px;
  padding: 0.7rem 1.4rem;
  border-radius: var(--fi-radius-pill);
  border: 1px solid transparent;
  font-size: 0.88rem;
  font-weight: 500;
  white-space: nowrap;
  transition: transform 0.25s ease, opacity 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.fi-btn:hover {
  transform: translateY(-1px);
}

.fi-btn-primary {
  background: var(--fi-gradient);
  color: #fff;
}

.fi-btn-nav-outline {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.34);
  color: var(--fi-ink);
  min-height: 38px;
  padding: 0.55rem 1.15rem;
  font-size: 0.82rem;
}

.fi-btn-ghost {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.32);
  color: var(--fi-ink);
}

.fi-heading-accent {
  color: var(--fi-blue);
}

.fi-btn-light {
  background: #fff;
  color: #000;
  border-color: #fff;
}

.fi-link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--fi-ink);
  font-size: 0.88rem;
  font-weight: 500;
}

.fi-link-arrow svg {
  width: 14px;
  height: 14px;
}

.fi-section {
  position: relative;
  padding: clamp(5rem, 9vw, 7.5rem) 0;
}

.fi-icon-box {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--fi-ink);
}

.fi-icon-box svg {
  width: 18px;
  height: 18px;
}

.fi-prism {
  position: absolute;
  pointer-events: none;
  filter: blur(48px);
}

.fi-prism-left {
  left: -6%;
  bottom: 6%;
  width: 240px;
  height: 240px;
  background: linear-gradient(135deg, rgba(255, 60, 120, 0.32), rgba(0, 122, 255, 0.28), rgba(255, 200, 80, 0.22));
  opacity: 0.55;
}

.fi-prism-right {
  right: -2%;
  top: 16%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255, 138, 0, 0.22), transparent 70%);
  opacity: 0.5;
}