:root {
  color-scheme: light;
  --ink: #101816;
  --paper: #f4f1e7;
  --lime: #d7ff52;
  --soft-ink: #4d5752;
  --line: rgba(16, 24, 22, 0.18);
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

a { color: inherit; }

button { font: inherit; }

.site-header {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.16em;
  text-decoration: none;
}

.wordmark-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--lime);
  font-family: var(--serif);
  font-size: 1.15rem;
  font-style: italic;
}

.header-link {
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  min-height: 710px;
  border-bottom: 1px solid var(--line);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 8vw 7vw 8vw 4vw;
}

.eyebrow,
.section-number {
  margin: 0 0 28px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow { display: flex; align-items: center; gap: 10px; }
.eyebrow span { width: 28px; height: 2px; background: var(--ink); }

h1,
h2,
p { margin-top: 0; }

h1 {
  max-width: 900px;
  margin-bottom: 36px;
  font-size: clamp(4rem, 8vw, 8.5rem);
  font-weight: 500;
  letter-spacing: -0.065em;
  line-height: 0.83;
}

h1 em {
  font-family: var(--serif);
  font-weight: 400;
}

.lede {
  max-width: 640px;
  margin-bottom: 38px;
  color: var(--soft-ink);
  font-size: clamp(1.05rem, 1.6vw, 1.32rem);
  line-height: 1.6;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  min-width: 210px;
  padding: 18px 20px;
  background: var(--ink);
  color: white;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.primary-action span { color: var(--lime); font-size: 1.3rem; }

.signal-card {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 34px;
  overflow: hidden;
  background: var(--ink);
  color: white;
}

.signal-topline,
.signal-meta {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  color: #bdc5c1;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.15em;
}

.road-graphic {
  position: relative;
  flex: 1;
  min-height: 290px;
  margin: 30px -34px;
  overflow: hidden;
}

.road-line {
  position: absolute;
  inset: auto -25% 18%;
  height: 1px;
  background: rgba(215, 255, 82, 0.54);
  transform: rotate(-18deg);
}

.line-two { bottom: 42%; transform: rotate(8deg); opacity: 0.5; }
.line-three { bottom: 63%; transform: rotate(-34deg); opacity: 0.28; }

.signal-dot {
  position: absolute;
  top: 43%;
  left: 48%;
  width: 126px;
  height: 126px;
  border: 1px solid var(--lime);
  border-radius: 50%;
}

.signal-dot::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 34px 10px rgba(215, 255, 82, 0.26);
  transform: translate(-50%, -50%);
}

.signal-label {
  margin-bottom: 14px;
  color: var(--lime);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.signal-value {
  margin-bottom: 30px;
  font-family: var(--serif);
  font-size: clamp(2.4rem, 4vw, 4.4rem);
  line-height: 0.98;
}

.signal-meta { padding-top: 22px; border-top: 1px solid rgba(255,255,255,0.18); }

.drive-section,
.principles {
  padding: 110px 4vw;
}

.drive-section {
  display: grid;
  grid-template-columns: minmax(250px, 0.75fr) minmax(420px, 1.25fr);
  gap: 8vw;
  border-bottom: 1px solid var(--line);
}

h2 {
  max-width: 980px;
  font-family: var(--serif);
  font-size: clamp(2.7rem, 5vw, 5.8rem);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 0.96;
}

.drive-options { border-top: 1px solid var(--ink); }

.drive-option {
  width: 100%;
  display: grid;
  grid-template-columns: 38px 1fr auto;
  gap: 18px;
  align-items: center;
  padding: 22px 8px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.drive-option:hover,
.drive-option:focus-visible,
.drive-option.is-active { background: var(--lime); }

.drive-option strong,
.drive-option small { display: block; }
.drive-option strong { margin-bottom: 5px; font-size: 1.08rem; }
.drive-option small { color: var(--soft-ink); font-size: 0.86rem; }
.option-number { font-family: var(--serif); font-style: italic; }

.selection-note {
  min-height: 48px;
  margin: 20px 8px 0;
  color: var(--soft-ink);
  font-size: 0.86rem;
  line-height: 1.5;
}

.principles { background: #e9e5d9; }
.principles h2 { margin-bottom: 70px; }

.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--ink);
}

.principle-grid article { min-height: 250px; padding: 24px 30px 24px 0; }
.principle-grid article + article { padding-left: 30px; border-left: 1px solid var(--line); }
.principle-grid span { font-family: var(--serif); font-style: italic; }
.principle-grid h3 { margin: 72px 0 12px; font-size: 1.25rem; }
.principle-grid p { max-width: 340px; color: var(--soft-ink); line-height: 1.55; }

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 34px 4vw;
  background: var(--ink);
  color: white;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .hero,
  .drive-section { grid-template-columns: 1fr; }
  .hero-copy { padding: 90px 6vw; }
  .signal-card { min-height: 620px; }
  .drive-section { gap: 45px; }
}

@media (max-width: 640px) {
  .site-header { min-height: 66px; }
  .header-link { display: none; }
  .hero { min-height: auto; }
  .hero-copy { padding: 72px 5vw; }
  h1 { font-size: clamp(3.5rem, 18vw, 5.5rem); }
  .signal-card { min-height: 560px; padding: 26px; }
  .road-graphic { margin-inline: -26px; }
  .drive-section,
  .principles { padding: 78px 5vw; }
  .drive-option { grid-template-columns: 28px 1fr auto; }
  .principle-grid { grid-template-columns: 1fr; }
  .principle-grid article { min-height: 190px; padding: 24px 0; }
  .principle-grid article + article { padding-left: 0; border-top: 1px solid var(--line); border-left: 0; }
  .principle-grid h3 { margin-top: 42px; }
  footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}