:root {
  --paper: #f4f1ea;
  --paper-soft: #fbfaf6;
  --ink: #172124;
  --muted: #4a5558;
  --line: #cfc6b7;
  --line-strong: #8b806f;
  --teal: #2f6272;
  --teal-dark: #234a56;
  --gold: #d6a33a;
  --gold-soft: #fff7df;
  --green: #2f6d50;
  --green-soft: #ecf8f0;
  --red: #a63f35;
  --red-soft: #fff0ed;
  --dark: #26343a;
  --white: #ffffff;
  --shadow: 0 22px 60px rgba(35, 42, 39, 0.15);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Segoe UI", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  letter-spacing: 0;
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(210px, 1fr) auto auto;
  align-items: center;
  gap: 24px;
  min-height: 72px;
  padding: 12px 34px;
  background: rgba(244, 241, 234, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--gold);
  color: #182225;
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 17px;
  line-height: 1.1;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.top-nav a,
.console-link,
.primary-action,
.secondary-action {
  text-decoration: none;
}

.top-nav a {
  padding: 8px 0;
}

.top-nav a:hover {
  color: var(--ink);
}

.console-link,
.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 900;
}

.console-link,
.primary-action {
  border: 1px solid var(--teal-dark);
  background: var(--teal);
  color: #ffffff;
}

.secondary-action {
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--ink);
}

.section-band {
  position: relative;
  padding: 86px clamp(24px, 5vw, 72px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(420px, 0.9fr) minmax(520px, 1fr);
  gap: 44px;
  align-items: center;
  min-height: calc(100vh - 72px);
  padding-top: 58px;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
  word-break: keep-all;
  overflow-wrap: break-word;
}

.hero-copy,
.hero-visual,
.proof-grid > *,
.split-proof > *,
.value-bridge > *,
.metric-rail > * {
  min-width: 0;
}

h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(39px, 4.8vw, 60px);
  line-height: 1.01;
  letter-spacing: 0;
}

h2 {
  max-width: 960px;
  margin-bottom: 18px;
  font-size: clamp(32px, 4.5vw, 54px);
  line-height: 1.05;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 18px;
  line-height: 1.25;
}

.lead,
.section-heading p,
.closing-line {
  max-width: 760px;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}

.hero-visual,
.product-shot {
  margin: 0;
}

.hero-visual img,
.product-shot img,
.diagram-shell img {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--white);
}

.hero-visual img {
  min-height: 420px;
  object-fit: cover;
  object-position: left top;
  box-shadow: var(--shadow);
}

figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.metric-rail {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  width: 100%;
  margin-top: 8px;
  border: 1px solid var(--line);
  background: var(--line);
}

.metric-rail div {
  min-height: 116px;
  padding: 22px;
  background: var(--paper-soft);
}

.metric-rail strong {
  display: block;
  margin-bottom: 8px;
  color: var(--teal);
  font-size: 42px;
  line-height: 1;
}

.metric-rail span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

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

.section-heading {
  display: grid;
  gap: 4px;
  margin-bottom: 38px;
}

.diagram-shell {
  padding: 16px;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 12px 36px rgba(35, 42, 39, 0.08);
}

.diagram-shell img {
  border: 0;
}

.mermaid-source {
  margin-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.mermaid-source summary {
  cursor: pointer;
  padding: 16px 0;
  font-weight: 900;
}

.mermaid-source pre {
  overflow: auto;
  margin: 0 0 10px;
  padding: 18px;
  background: #26343a;
  color: #f8f4ec;
  font-size: 13px;
  line-height: 1.55;
}

.proof-section {
  border-top: 1px solid var(--line);
}

.proof-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.7fr);
  gap: 38px;
  align-items: start;
}

.proof-grid.reverse {
  grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.65fr);
}

.product-shot img {
  box-shadow: 0 18px 46px rgba(35, 42, 39, 0.12);
}

.proof-notes,
.boundary-list,
.status-model,
.value-bridge {
  display: grid;
  gap: 14px;
}

.proof-notes article,
.boundary-list article,
.status-model article,
.value-bridge article {
  padding: 18px;
  border-left: 3px solid var(--teal);
  background: var(--paper-soft);
}

.proof-notes p,
.boundary-list p,
.status-model p,
.value-bridge p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.split-proof {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(340px, 0.75fr);
  gap: 38px;
  align-items: start;
  border-top: 1px solid var(--line);
}

.split-proof .section-heading {
  grid-column: 1 / -1;
  margin-bottom: 0;
}

.boundary-list article {
  border-color: var(--gold);
}

.boundary-list span {
  display: inline-flex;
  margin-bottom: 8px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.boundary-list strong,
.status-model strong,
.value-bridge strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.status-model article {
  border-left-width: 0;
  border-top: 4px solid var(--gold);
}

.status-model .confirmed {
  border-top-color: var(--green);
  background: var(--green-soft);
}

.status-model .excluded {
  border-top-color: var(--red);
  background: var(--red-soft);
}

.governance .boundary-list article:nth-child(2) {
  border-color: var(--red);
}

.governance .boundary-list article:nth-child(3) {
  border-color: var(--green);
}

.closing {
  border-top: 1px solid var(--line);
  padding-bottom: 120px;
}

.closing h2 {
  max-width: 940px;
}

.value-bridge {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 44px 0;
}

.value-bridge article {
  min-height: 172px;
  border-left: 0;
  border-top: 4px solid var(--teal);
}

.value-bridge article:nth-child(2) {
  border-top-color: var(--gold);
  background: var(--gold-soft);
}

.value-bridge article:nth-child(3) {
  border-top-color: var(--green);
  background: var(--green-soft);
}

.closing-line {
  max-width: 1040px;
  padding: 28px 34px;
  background: var(--dark);
  color: #f8f4ec;
  font-size: 24px;
  font-weight: 900;
  line-height: 1.45;
}

.reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 520ms ease, transform 520ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.product-shot img,
.hero-visual img,
.diagram-shell {
  transition: transform 220ms ease, box-shadow 220ms ease;
}

.product-shot:hover img,
.hero-visual:hover img,
.diagram-shell:hover {
  transform: translateY(-3px);
}

@media (max-width: 980px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .top-nav {
    display: none;
  }

  .hero,
  .proof-grid,
  .proof-grid.reverse,
  .split-proof {
    grid-template-columns: 1fr;
  }

  .metric-rail,
  .value-bridge {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-visual img {
    min-height: auto;
  }
}

@media (max-width: 640px) {
  .site-header {
    padding: 10px 16px;
  }

  .console-link {
    display: none;
  }

  .section-band {
    padding: 58px 18px;
  }

  .hero {
    display: flex;
    flex-direction: column;
    width: calc(100vw - 36px);
    max-width: calc(100vw - 36px);
  }

  .hero-copy,
  .hero-visual {
    width: 100%;
    max-width: 100%;
  }

  h1 {
    font-size: clamp(31px, 8.6vw, 34px);
    line-height: 1.08;
    max-width: 100%;
    word-break: keep-all;
    overflow-wrap: anywhere;
  }

  h2 {
    font-size: clamp(28px, 8vw, 31px);
    line-height: 1.12;
    max-width: 100%;
    word-break: break-all;
    overflow-wrap: anywhere;
  }

  .lead,
  .section-heading p {
    font-size: 17px;
  }

  .metric-rail,
  .value-bridge {
    grid-template-columns: 1fr;
  }

  .diagram-shell {
    overflow-x: auto;
  }

  .diagram-shell img {
    min-width: 760px;
  }
}
