/* ── Skip navigation (accessibility) ── */
.skip-nav {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
  z-index: 9999;
}
.skip-nav:focus {
  position: fixed;
  top: 0;
  left: 0;
  width: auto;
  height: auto;
  padding: 0.75rem 1.5rem;
  background: var(--accent, #d4530a);
  color: #fff;
  font-weight: 600;
  text-decoration: none;
  border-radius: 0 0 4px 0;
  outline: 3px solid #fff;
}

/* ── BIS SP-21 Design Tokens ── */
:root {
  --accent:          #d4530a;
  --accent-hover:    #b8460a;
  --accent-dark:     #ff8c3a;
  --accent-focus:    #e05a0f;

  --navy:            #003380;

  --canvas:          #ffffff;
  --parchment:       #f4f4f2;
  --pearl:           #fafaf8;
  --tile-dark-1:     #1a2230;
  --tile-dark-2:     #1e2838;
  --tile-dark-3:     #161d28;
  --surface-black:   #0d1117;

  --ink:             #1c1c1e;
  --ink-80:          #2d2d30;
  --ink-48:          #6e6e73;
  --on-dark:         #ffffff;
  --on-dark-muted:   #b8c0cc;
  --body-muted:      #8a8a8f;

  --hairline:        #d8d8dc;
  --divider:         #ebebed;

  --chip-bg:         rgba(212, 83, 10, 0.08);
  --chip-text:       #b8460a;

  --font-display: "SF Pro Display", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-text:    "SF Pro Text",    ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;

  --r-xs:   4px;
  --r-sm:   8px;
  --r-md:   12px;
  --r-lg:   18px;
  --r-pill: 9999px;

  --sp-xxs: 4px;
  --sp-xs:  8px;
  --sp-sm:  12px;
  --sp-md:  18px;
  --sp-lg:  24px;
  --sp-xl:  32px;
  --sp-xxl: 48px;
  --sp-sec: 80px;

  --nav-h: 48px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: var(--ink);
  background: var(--canvas);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Tiles (global) ── */
.tile { width: 100%; padding: var(--sp-sec) 0; }
.tile-light     { background: var(--canvas); }
.tile-parchment { background: var(--parchment); }
.tile-dark      { background: var(--tile-dark-1); }
.tile-dark-2    { background: var(--tile-dark-2); }

.tile-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 40px;
}
.tile-center { text-align: center; }

/* ── Typography (global) ── */
.hero-display {
  font-family: var(--font-display);
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.5px;
  color: var(--on-dark);
  margin: 12px 0 20px;
}
.tile-eyebrow {
  font-family: var(--font-text);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--accent-dark);
  margin-bottom: 8px;
}
.display-lg {
  font-family: var(--font-display);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.3px;
  color: var(--ink);
}
.tile-dark  .display-lg,
.tile-dark-2 .display-lg { color: var(--on-dark); }

.display-md {
  font-family: var(--font-text);
  font-size: clamp(22px, 3vw, 34px);
  font-weight: 600;
  line-height: 1.18;
  letter-spacing: -0.374px;
  color: var(--on-dark);
  margin-bottom: 20px;
}
.lead {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.5vw, 24px);
  font-weight: 400;
  line-height: 1.4;
  color: var(--on-dark-muted);
  margin-bottom: 32px;
}
.lead-sub {
  font-size: 17px;
  font-weight: 400;
  line-height: 1.47;
  letter-spacing: -0.374px;
  color: var(--ink-48);
  margin: 8px 0 28px;
}
.body-copy {
  font-size: 17px;
  line-height: 1.6;
  letter-spacing: -0.374px;
  color: var(--on-dark-muted);
  margin-bottom: 16px;
}

/* ── Buttons (global) ── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: -0.374px;
  text-decoration: none;
  padding: 11px 24px;
  border-radius: var(--r-pill);
  border: none;
  cursor: pointer;
  transition: background .15s, transform .1s;
  white-space: nowrap;
}
.btn-primary:hover  { background: var(--accent-hover); }
.btn-primary:active { transform: scale(.96); }
.btn-primary:focus-visible { outline: 2px solid var(--accent-focus); outline-offset: 2px; }

.btn-ghost-dark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  color: var(--accent-dark);
  font-family: var(--font-text);
  font-size: 17px;
  font-weight: 400;
  line-height: 1;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: var(--r-pill);
  border: 1.5px solid var(--accent-dark);
  cursor: pointer;
  transition: background .15s, transform .1s;
}
.btn-ghost-dark:hover  { background: rgba(255,140,58,0.1); }
.btn-ghost-dark:active { transform: scale(.96); }

.btn-primary-on-dark {
  display: inline-flex;
  align-items: center;
  background: var(--accent-dark);
  color: var(--surface-black);
  font-family: var(--font-text);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  padding: 11px 24px;
  border-radius: var(--r-pill);
  border: none;
  cursor: pointer;
  transition: background .15s, transform .1s;
  margin-top: 8px;
}
.btn-primary-on-dark:hover  { background: #ffaa5c; }
.btn-primary-on-dark:active { transform: scale(.96); }

/* Hero stats */
.hero-stats {
  display: inline-flex;
  align-items: center;
  gap: 32px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--r-lg);
  padding: 20px 36px;
  margin-top: 8px;
}
.stat { text-align: center; }
.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  color: var(--accent-dark);
  line-height: 1;
}
.stat-label {
  display: block;
  font-size: 12px;
  color: var(--on-dark-muted);
  margin-top: 4px;
}
.stat-divider { width: 1px; height: 36px; background: rgba(255,255,255,0.12); }
.desktop-only { display: inline; }

/* Focus */
*:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── Responsive ── */
@media (max-width: 833px) {
  :root { --sp-sec: 56px; }
  .hero-stats { gap: 20px; padding: 16px 24px; }
  .stat-num { font-size: 22px; }
  .desktop-only { display: none; }
}
@media (max-width: 640px) {
  :root { --sp-sec: 48px; }
  .tile-inner { padding: 0 20px; }
  .hero-stats { flex-direction: column; gap: 12px; padding: 16px 20px; }
  .stat-divider { width: 40px; height: 1px; }
}