/* 2RK Design Tokens — single source of truth */
:root {
  /* Color — dark */
  --bg-dark: #101213;
  --bg-dark-2: #16181a;
  --card-dark: #1a1c1e;
  --card-dark-hover: #202226;
  --border-dark: #2a2d31;
  --border-dark-strong: #3a3d42;
  --text-dark-hi: #ffffff;
  --text-dark-mid: #d4d5d7;
  --text-dark-lo: #9a9da2;

  /* Color — light */
  --bg-light: #fafaf8;
  --bg-light-2: #f2f1ed;
  --card-light: #ffffff;
  --border-light: #e5e3dd;
  --border-light-strong: #cdcac2;
  --text-light-hi: #101213;
  --text-light-mid: #3a3d42;
  --text-light-lo: #6a6d72;

  /* Brand */
  --red: #d22e24;
  --red-hover: #b9261d;
  --red-soft: #e5534a;

  /* Sparing accent for data viz moments */
  --accent-blue: oklch(0.72 0.06 230);
  --accent-sand: oklch(0.78 0.04 80);
  --accent-moss: oklch(0.68 0.05 150);

  /* Type */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* Spacing */
  --container: 1200px;
  --section-py-d: 96px;
  --section-py-m: 64px;
  --gap: 28px;

  /* Radius */
  --r-card: 12px;
  --r-chip: 6px;
  --r-pill: 999px;

  /* Motion */
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* Reset-ish */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text-light-hi);
  background: var(--bg-light);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; background: none; border: 0; color: inherit; }
h1, h2, h3, h4, h5 { margin: 0; letter-spacing: -0.02em; line-height: 1.1; font-weight: 700; }
p { margin: 0; }

/* Layout */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}
.section {
  padding: var(--section-py-d) 0;
}
.section.dark {
  background: var(--bg-dark);
  color: var(--text-dark-mid);
}
.section.dark h1, .section.dark h2, .section.dark h3, .section.dark h4 { color: var(--text-dark-hi); }
.section.light {
  background: var(--bg-light);
  color: var(--text-light-mid);
}
.section.light-2 { background: var(--bg-light-2); color: var(--text-light-mid); }

/* Eyebrow */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  display: inline-block;
}
.section.dark .eyebrow { color: var(--red-soft); }

/* Typographic scale */
.h-display {
  font-size: clamp(44px, 6.5vw, 84px);
  letter-spacing: -0.03em;
  line-height: 1.02;
  font-weight: 700;
}
.h-hero {
  font-size: clamp(40px, 5.4vw, 68px);
  letter-spacing: -0.025em;
  line-height: 1.05;
  font-weight: 700;
}
.h-section {
  font-size: clamp(32px, 3.8vw, 48px);
  letter-spacing: -0.022em;
  line-height: 1.08;
  font-weight: 700;
}
.h-card {
  font-size: 20px;
  letter-spacing: -0.015em;
  line-height: 1.25;
  font-weight: 600;
}
.lede {
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.55;
  max-width: 62ch;
  color: var(--text-light-mid);
}
.section.dark .lede { color: var(--text-dark-mid); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: var(--r-chip);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.005em;
  transition: all 180ms var(--ease);
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn-primary {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}
.btn-primary:hover { background: var(--red-hover); border-color: var(--red-hover); transform: translateY(-1px); }
.btn-ghost {
  background: transparent;
  color: currentColor;
  border-color: var(--border-dark-strong);
}
.section.light .btn-ghost { border-color: var(--border-light-strong); }
.btn-ghost:hover { border-color: var(--red); color: var(--red); }
.section.dark .btn-ghost:hover { color: var(--red-soft); }

.link-arrow {
  color: currentColor;
  font-weight: 500;
  font-size: 15px;
  display: inline-flex;
  gap: 6px;
  align-items: center;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: all 180ms var(--ease);
}
.link-arrow:hover { color: var(--red); border-bottom-color: var(--red); }
.section.dark .link-arrow:hover { color: var(--red-soft); border-bottom-color: var(--red-soft); }

/* Focus ring */
:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(16, 18, 19, 0.82);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border-dark);
  color: var(--text-dark-mid);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.015em;
  font-size: 15px;
}
.brand-mark {
  width: 22px;
  height: 22px;
  position: relative;
  display: grid;
  place-items: center;
}
.brand-mark svg { width: 100%; height: 100%; }
.brand-logo {
  display: block;
  height: 28px;
  width: auto;
}
.site-footer .brand-logo { height: 32px; }
.nav-links {
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 14px;
  color: var(--text-dark-mid);
}
.nav-links a { transition: color 160ms var(--ease); }
.nav-links a:hover { color: #fff; }
.nav-links a.active { color: #fff; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px;
  border-radius: var(--r-chip);
  background: var(--red);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  transition: background 160ms var(--ease);
}
.nav-cta:hover { background: var(--red-hover); }
.burger { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; color: #fff; }
.burger svg { width: 20px; height: 20px; }

/* Footer */
.site-footer {
  background: #0a0c0d;
  color: var(--text-dark-lo);
  padding: 80px 0 40px;
  border-top: 1px solid var(--border-dark);
}
.site-footer h4 { color: #fff; font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase; font-family: var(--font-mono); font-weight: 500; margin-bottom: 20px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr 1fr; gap: 48px; }
.footer-grid a { display: block; padding: 6px 0; font-size: 14px; color: var(--text-dark-mid); }
.footer-grid a:hover { color: #fff; }
.footer-bottom { margin-top: 64px; padding-top: 28px; border-top: 1px solid var(--border-dark); display: flex; justify-content: space-between; font-size: 13px; color: var(--text-dark-lo); font-family: var(--font-mono); }

/* Placeholder images */
.phimg {
  background:
    repeating-linear-gradient(135deg,
      rgba(255,255,255,0.04) 0 12px,
      rgba(255,255,255,0.01) 12px 24px),
    var(--card-dark);
  border: 1px solid var(--border-dark);
  border-radius: var(--r-card);
  display: grid;
  place-items: center;
  color: var(--text-dark-lo);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  aspect-ratio: 16/10;
}
.phimg.light {
  background:
    repeating-linear-gradient(135deg,
      rgba(16,18,19,0.045) 0 12px,
      rgba(16,18,19,0.015) 12px 24px),
    var(--bg-light-2);
  border-color: var(--border-light);
  color: var(--text-light-lo);
}
.phimg.circle { border-radius: 50%; aspect-ratio: 1/1; }

/* Responsive */
@media (max-width: 860px) {
  .section { padding: var(--section-py-m) 0; }
  .container { padding: 0 20px; }
  .nav-links { display: none; }
  .burger { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .footer-bottom { flex-direction: column; gap: 12px; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
}