:root {
  color-scheme: light;
  --ink: #17211b;
  --muted: #5d6a61;
  --paper: #fbfbf7;
  --panel: #ffffff;
  --line: #dce2db;
  --accent: #bf3f2f;
  --accent-dark: #7e271f;
  --green: #2f6b50;
  --gold: #c99a2e;
  --shadow: 0 18px 50px rgba(23, 33, 27, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  background: rgba(251, 251, 247, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand {
  font-weight: 800;
  text-decoration: none;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: flex-end;
}

nav a,
.button {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.85rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.72);
}

nav a:hover,
.button:hover,
.card:hover {
  border-color: var(--accent);
}

.button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(280px, 0.96fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  align-items: center;
  padding: clamp(2rem, 6vw, 5.5rem) clamp(1rem, 4vw, 3rem);
  min-height: calc(100vh - 74px);
}

.hero.compact {
  min-height: auto;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0;
  margin: 0 0 0.7rem;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 5.6rem);
  line-height: 0.98;
  margin: 0;
  max-width: 900px;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 2.3rem);
  line-height: 1.12;
  margin: 0 0 0.75rem;
}

h3 {
  margin: 0 0 0.55rem;
  font-size: 1.2rem;
}

.lead {
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.32rem);
  max-width: 760px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

.hero-media {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.band {
  padding: clamp(2rem, 5vw, 4rem) clamp(1rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  background: #f2f5ee;
}

.band.inset {
  border: 1px solid var(--line);
  border-radius: 8px;
  margin: 2rem 0 0;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.5rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.card {
  min-height: 220px;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms ease, transform 160ms ease;
}

.card:hover {
  transform: translateY(-2px);
}

.card span,
.steps span {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 1rem;
  border-radius: 999px;
  background: #e7eee6;
  color: var(--green);
  font-weight: 900;
}

.card p,
.note p,
.paper-body p,
.case-list p,
.steps p {
  color: var(--muted);
  margin: 0;
}

.page {
  width: min(1120px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 4rem) 0;
}

.page-hero {
  padding: clamp(1rem, 4vw, 3rem) 0 clamp(2rem, 5vw, 4rem);
}

.page-hero h1 {
  font-size: clamp(2.3rem, 5vw, 4.7rem);
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.42fr);
  gap: 1rem;
  align-items: start;
}

.content-grid article,
.note,
.case-list article,
.steps article,
.paper-body {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: clamp(1rem, 3vw, 1.6rem);
}

.note {
  border-top: 5px solid var(--gold);
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.metric-row div {
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
}

.metric-row strong,
.metric-row span {
  display: block;
}

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

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.case-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.diagram {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
}

.diagram div {
  min-height: 120px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: linear-gradient(135deg, #ffffff, #eef4eb);
  font-weight: 900;
  text-align: center;
}

.paper {
  max-width: 900px;
}

.paper-body h2 {
  margin-top: 1.75rem;
}

.paper-body h2:first-child {
  margin-top: 0;
}

.slides-body {
  background: #101612;
  color: #f8fbf5;
}

.slides-body .site-header {
  background: rgba(16, 22, 18, 0.94);
  border-bottom-color: rgba(255, 255, 255, 0.16);
}

.slides-body nav a {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
}

.slides {
  display: grid;
  gap: 1rem;
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 1rem 0 3rem;
}

.slide {
  min-height: 72vh;
  display: grid;
  align-content: center;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  padding: clamp(1.5rem, 5vw, 4rem);
  background: #18221b;
}

.slide.cover {
  grid-template-columns: minmax(240px, 0.8fr) minmax(0, 1fr);
  gap: clamp(1rem, 4vw, 3rem);
  align-items: center;
}

.slide.cover img {
  border-radius: 8px;
}

.slide h1,
.slide h2 {
  color: white;
}

.slide p,
.slide li {
  color: #d7dfd5;
  font-size: clamp(1.1rem, 2vw, 1.45rem);
}

.slide ul {
  margin: 1rem 0 0;
  padding-left: 1.3rem;
}

@media (max-width: 860px) {
  .site-header,
  .hero,
  .content-grid,
  .slide.cover {
    grid-template-columns: 1fr;
  }

  .site-header {
    align-items: flex-start;
  }

  .card-grid,
  .steps,
  .case-list,
  .diagram,
  .metric-row {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    font-size: clamp(2.25rem, 14vw, 4rem);
  }

  nav {
    justify-content: flex-start;
  }
}