:root {
  --paper: #f5f5f2;
  --ink: #1a1a1a;
  --blue: #0047ff;
  --blue-pale: #e6ecff;
  --line: #cfd1d4;
  --muted: #676b73;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
img { display: block; width: 100%; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  min-height: 76px;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto auto;
  align-items: center;
  gap: 34px;
  padding: 0 4vw;
  border-bottom: 1px solid var(--line);
  background: rgba(245,245,242,.94);
  backdrop-filter: blur(12px);
}
.brand { font-weight: 750; letter-spacing: -.025em; }
nav { display: flex; gap: 30px; font-size: 13px; }
nav a:hover { color: var(--blue); }
.mobile-nav { display: none; }
.header-cta { padding: 12px 18px; border: 1px solid var(--ink); font-size: 13px; }

.hero {
  min-height: 760px;
  display: grid;
  grid-template-columns: 5fr 7fr;
  border-bottom: 1px solid var(--line);
}
.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 7vw 4vw 5vw;
}
.eyebrow {
  margin: 0 0 22px;
  color: var(--blue);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .16em;
  text-transform: uppercase;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 28px;
  font-size: clamp(48px, 4.3vw, 72px);
  line-height: .98;
  letter-spacing: -.065em;
}
h2 {
  margin-bottom: 24px;
  font-size: clamp(36px, 3.3vw, 56px);
  line-height: 1.04;
  letter-spacing: -.055em;
}
h3 { margin-bottom: 12px; font-size: 16px; }
.lead { max-width: 680px; color: var(--muted); font-size: 17px; line-height: 1.75; }
.actions { display: flex; gap: 12px; margin-top: 24px; }
.button { padding: 14px 20px; border: 1px solid var(--ink); font-size: 13px; font-weight: 700; }
.button.primary { color: white; background: var(--blue); border-color: var(--blue); }
.button.secondary { background: transparent; }
.hero-visual { position: relative; margin: 0; min-height: 760px; overflow: hidden; background: #dfe5ef; }
.hero-visual img { height: 100%; object-fit: cover; }

.report-section {
  display: grid;
  grid-template-columns: 150px 1fr;
  border-bottom: 1px solid var(--line);
}
.section-index { padding: 70px 28px; border-right: 1px solid var(--line); }
.section-index span { display: block; color: var(--blue); font: 700 13px/1 ui-monospace, monospace; }
.section-index p { margin: 22px 0 0; font-size: 12px; writing-mode: vertical-rl; letter-spacing: .16em; }
.section-content { padding: 90px 5vw; }
.section-heading { align-self: center; }
.section-heading.compact { max-width: 860px; }

.comparison-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 1px; margin: 45px 0; background: var(--line); border: 1px solid var(--line); }
.fact-card { min-height: 190px; padding: 26px; background: var(--paper); }
.fact-card.verified { color: white; background: var(--blue); }
.card-tag { display: inline-block; margin-bottom: 42px; font: 700 10px/1 ui-monospace, monospace; letter-spacing: .12em; }
.fact-card p { margin: 0; font-size: 18px; line-height: 1.5; }

.image-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.image-pair figure, .feature-image { margin: 0; }
.image-pair img { aspect-ratio: 4/3; object-fit: cover; }

.dark { color: white; background: var(--ink); border-color: #343434; }
.dark .section-index { border-color: #343434; }
.dark .lead { color: #b9bcc3; }
.dark .eyebrow { color: #82a4ff; }
.split { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 6vw; align-items: center; }
.split.reverse { grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); }
.feature-image img { aspect-ratio: 3/2; object-fit: cover; }
.fact-list { margin: 38px 0 0; }
.fact-list div, .contact-list div { display: grid; grid-template-columns: 135px 1fr; gap: 20px; padding: 16px 0; border-top: 1px solid var(--line); }
.fact-list dt, .contact-list dt { color: var(--muted); font-size: 12px; }
.fact-list dd, .contact-list dd { margin: 0; font-size: 13px; font-weight: 700; }
.fact-list.light div { border-color: #3b3b3b; }
.fact-list.light dt { color: #a9adb6; }

.pale { background: var(--blue-pale); }
.project { background: white; }
.project-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 6vw; align-items: end; }
.project-number { color: var(--blue); font-size: clamp(100px, 15vw, 240px); font-weight: 800; line-height: .75; letter-spacing: -.08em; }
.fine-print { margin: 32px 0 0; color: var(--muted); font-size: 12px; line-height: 1.7; }

.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 8vw; padding: 110px calc(5vw + 150px); background: var(--blue-pale); }
.contact-list { margin: 0; }
footer { display: flex; justify-content: space-between; gap: 30px; padding: 28px 4vw; color: white; background: var(--ink); font-size: 11px; }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; min-height: 68px; gap: 16px; }
  nav { display: none; }
  .mobile-nav { position: relative; display: block; }
  .mobile-nav summary { padding: 9px 12px; border: 1px solid var(--ink); font-size: 13px; list-style: none; cursor: pointer; }
  .mobile-nav summary::-webkit-details-marker { display: none; }
  .mobile-nav div { position: absolute; top: calc(100% + 12px); right: 0; min-width: 180px; padding: 8px 18px; border: 1px solid var(--line); background: var(--paper); box-shadow: 0 18px 40px rgba(0,0,0,.14); }
  .mobile-nav a { display: block; padding: 11px 0; border-bottom: 1px solid var(--line); font-size: 13px; }
  .mobile-nav a:last-child { border-bottom: 0; }
  .brand { font-size: 13px; }
  .header-cta { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; }
  .hero-copy { min-height: 600px; padding: 80px 22px 40px; }
  h1 { font-size: clamp(42px, 12vw, 60px); }
  h2 { font-size: 38px; }
  .hero-visual { min-height: 420px; }
  .report-section { grid-template-columns: 48px 1fr; }
  .section-index { padding: 45px 12px; }
  .section-index p { display: none; }
  .section-content { padding: 70px 22px; }
  .comparison-grid, .image-pair, .split, .split.reverse, .project-grid { grid-template-columns: 1fr; }
  .comparison-grid { gap: 1px; }
  .split, .split.reverse { gap: 42px; }
  .project-number { font-size: 120px; }
  .contact { grid-template-columns: 1fr; padding: 80px 22px 80px 70px; }
  .fact-list div, .contact-list div { grid-template-columns: 110px 1fr; }
  footer { flex-direction: column; }
}