:root {
  color-scheme: light;
  --bg: #ffffff;
  --text: #111111;
  --muted: #5d646b;
  --line: #dfe5e8;
  --soft: #f5f8f7;
  --accent: #0c7d75;
  --accent-2: #245f9f;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  letter-spacing: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 40px;
  border-bottom: 1px solid rgba(223, 229, 232, 0.82);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 620;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border: 1px solid var(--text);
  border-radius: 50%;
  background:
    linear-gradient(90deg, transparent 47%, var(--text) 47%, var(--text) 53%, transparent 53%),
    linear-gradient(0deg, transparent 47%, var(--text) 47%, var(--text) 53%, transparent 53%);
}

.nav {
  display: flex;
  gap: 28px;
  color: var(--muted);
  font-size: 0.94rem;
}

.nav a:hover,
.footer a:hover {
  color: var(--text);
}

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 74vh;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.hero-asset {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center right;
  opacity: 0.58;
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(var(--max), calc(100% - 80px));
  margin: 0 auto;
  padding: 70px 0;
}

.hero h1 {
  max-width: 860px;
  margin: 0;
  font-size: 6.5rem;
  line-height: 0.98;
  font-weight: 600;
  text-shadow: 0 0 28px rgba(255, 255, 255, 0.94);
}

.hero p {
  max-width: 620px;
  margin: 32px 0 0;
  color: #2d3439;
  font-size: 1.35rem;
  line-height: 1.45;
  text-shadow: 0 0 22px rgba(255, 255, 255, 0.96);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--text);
  border-radius: 6px;
  font-size: 0.95rem;
  font-weight: 560;
}

.button.primary {
  background: var(--text);
  color: #ffffff;
}

.button.secondary {
  background: rgba(255, 255, 255, 0.7);
}

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

.signal-band {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: min(var(--max), calc(100% - 80px));
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
}

.signal-item {
  min-height: 122px;
  padding: 26px 28px 24px 0;
  border-right: 1px solid var(--line);
}

.signal-item:last-child {
  border-right: 0;
}

.signal-item span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
}

.signal-item strong {
  display: block;
  max-width: 210px;
  margin-top: 16px;
  font-size: 1.08rem;
  line-height: 1.35;
}

.section {
  width: min(var(--max), calc(100% - 80px));
  margin: 0 auto;
  padding: 96px 0;
  border-bottom: 1px solid var(--line);
}

.two-column,
.principles {
  display: grid;
  grid-template-columns: minmax(220px, 0.78fr) minmax(0, 1.22fr);
  gap: 80px;
}

h2 {
  margin: 0;
  font-size: 3rem;
  line-height: 1.08;
  font-weight: 560;
}

h3 {
  margin: 0;
  font-size: 1.18rem;
  line-height: 1.3;
  font-weight: 620;
}

p {
  margin: 0;
}

.section-copy,
.section-head p,
.principle-list {
  color: #2f373d;
}

.lead {
  color: var(--text);
  font-size: 1.55rem;
  line-height: 1.38;
}

.section-copy p + p {
  margin-top: 28px;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1.2fr);
  gap: 80px;
  margin-bottom: 58px;
}

.section-head p {
  max-width: 620px;
  font-size: 1.12rem;
}

.model-line-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.model-line {
  display: grid;
  grid-template-columns: minmax(220px, 0.5fr) minmax(0, 1fr) minmax(220px, 0.52fr);
  gap: 46px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
}

.model-kicker {
  display: block;
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.model-line p {
  color: #2f373d;
}

.model-line dl {
  display: grid;
  gap: 18px;
  margin: 0;
}

.model-line dt {
  color: var(--muted);
  font-size: 0.88rem;
}

.model-line dd {
  margin: 4px 0 0;
  font-weight: 560;
  line-height: 1.35;
}

.architecture-grid {
  border-top: 1px solid var(--line);
}

.architecture-row {
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 36px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.architecture-row:last-child {
  border-bottom: 0;
}

.row-index {
  color: var(--accent);
  font-family: "SF Mono", "Cascadia Mono", Consolas, monospace;
  font-size: 0.95rem;
}

.architecture-row p {
  max-width: 780px;
  margin-top: 10px;
  color: var(--muted);
}

.evidence-table {
  border-top: 1px solid var(--line);
}

.evidence-row {
  display: grid;
  grid-template-columns: minmax(180px, 0.45fr) minmax(0, 1fr);
  gap: 48px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.evidence-row span {
  color: var(--muted);
}

.evidence-row strong {
  font-weight: 560;
}

.principle-list {
  display: grid;
  gap: 26px;
  font-size: 1.2rem;
  line-height: 1.48;
}

.roadmap-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.roadmap-list li {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: 34px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.roadmap-list span {
  color: var(--accent-2);
  font-family: "SF Mono", "Cascadia Mono", Consolas, monospace;
  font-size: 0.95rem;
}

.roadmap-list p {
  max-width: 760px;
  font-size: 1.22rem;
  line-height: 1.42;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  align-items: center;
  width: min(var(--max), calc(100% - 80px));
  margin: 0 auto;
  padding: 34px 0 46px;
  color: var(--muted);
  font-size: 0.94rem;
}

.footer span {
  color: var(--text);
  font-weight: 620;
  margin-right: auto;
}

@media (max-width: 880px) {
  .site-header {
    padding: 0 22px;
  }

  .nav {
    display: none;
  }

  .hero {
    min-height: 70vh;
  }

  .hero-content,
  .section,
  .signal-band,
  .footer {
    width: min(100% - 48px, var(--max));
  }

  .hero-content {
    padding: 54px 0;
  }

  .hero h1 {
    font-size: 3.8rem;
  }

  .hero p {
    font-size: 1.12rem;
  }

  .hero-asset {
    opacity: 0.38;
    object-position: center;
  }

  .signal-band {
    grid-template-columns: 1fr 1fr;
  }

  .signal-item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .section {
    padding: 68px 0;
  }

  .two-column,
  .principles,
  .section-head,
  .model-line {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  h2 {
    font-size: 2.35rem;
  }

  .lead {
    font-size: 1.28rem;
  }

  .architecture-row,
  .evidence-row,
  .roadmap-list li {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

@media (max-width: 520px) {
  .hero {
    min-height: 68vh;
  }

  .hero h1 {
    font-size: 2.9rem;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .signal-band {
    grid-template-columns: 1fr;
  }

  .signal-item {
    min-height: auto;
    padding: 22px 0;
  }

  h2 {
    font-size: 2rem;
  }

  .principle-list,
  .roadmap-list p {
    font-size: 1.06rem;
  }
}