:root {
  --maroon: #500000;
  --maroon-dark: #360000;
  --red: #b40000;
  --green: #168a58;
  --blue: #2c6fb7;
  --gold: #d68a00;
  --ink: #151515;
  --muted: #5c5c5c;
  --line: #d7d1cd;
  --paper: #ffffff;
  --wash: #f6f3ef;
  --green-wash: #e8f6ef;
  --red-wash: #fde9e7;
  --gold-wash: #fff4d6;
  --shadow: 0 18px 46px rgba(80, 0, 0, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  letter-spacing: 0;
}

img {
  display: block;
  width: 100%;
  height: auto;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
  padding: 0 42px;
  border-bottom: 1px solid rgba(80, 0, 0, 0.16);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--maroon);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.2rem;
  font-weight: 700;
}

nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

nav a:hover,
nav a:focus {
  color: var(--maroon);
}

.hero {
  position: relative;
  min-height: 720px;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding: 96px 42px 86px;
  border-bottom: 8px solid var(--maroon);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.82);
}

.hero-media {
  position: absolute;
  inset: 0;
  background-image: url("assets/site/fig0_pipeline.png");
  background-position: center;
  background-size: cover;
  opacity: 0.34;
}

.hero-content {
  position: relative;
  width: min(1040px, 100%);
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--maroon);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--maroon);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.08;
}

h1 {
  max-width: 980px;
  font-size: 4.1rem;
}

h2 {
  font-size: 2.55rem;
}

h3 {
  font-size: 1.65rem;
}

p {
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.58;
}

.hero-copy {
  max-width: 780px;
  margin: 24px 0 0;
  color: #2a2a2a;
  font-size: 1.38rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--maroon);
  border-radius: 6px;
  font-size: 0.98rem;
  font-weight: 800;
}

.button.primary {
  background: var(--maroon);
  color: #fff;
}

.button.secondary {
  background: #fff;
  color: var(--maroon);
}

.section {
  padding: 84px 42px;
}

.section-heading {
  max-width: 980px;
  margin: 0 auto 38px;
}

.section-heading p {
  max-width: 880px;
}

.metric-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  max-width: 1180px;
  margin: 0 auto;
}

.metric {
  min-height: 190px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.metric:nth-child(1) {
  border-color: rgba(214, 138, 0, 0.48);
  background: var(--gold-wash);
}

.metric:nth-child(2) {
  border-color: rgba(180, 0, 0, 0.42);
  background: var(--red-wash);
}

.metric:nth-child(3) {
  border-color: rgba(22, 138, 88, 0.42);
  background: var(--green-wash);
}

.metric-label,
.metric span:last-child {
  display: block;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.metric strong {
  display: block;
  margin: 18px 0 10px;
  color: var(--maroon);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.55rem;
}

.figure-band {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 42px;
  align-items: center;
  background: var(--wash);
}

.figure-band.reverse {
  grid-template-columns: 1fr 0.9fr;
}

.figure-band.reverse .figure-copy {
  order: 2;
}

.figure-copy {
  max-width: 520px;
  justify-self: end;
}

figure {
  margin: 0;
}

figure img {
  border: 1px solid var(--line);
  background: #fff;
}

figcaption {
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.two-column {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 36px;
  max-width: 1180px;
  margin: 0 auto;
}

.definition-panel {
  padding: 28px;
  border: 1px solid rgba(180, 0, 0, 0.38);
  border-radius: 8px;
  background: var(--red-wash);
}

.formula {
  margin-top: 0;
  color: var(--red);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.45rem;
  font-weight: 700;
}

dl {
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
}

dt {
  color: var(--ink);
  font-weight: 800;
}

dd {
  margin: 5px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.table-wrap {
  max-width: 1180px;
  margin: 0 auto;
  overflow-x: auto;
  border: 1px solid var(--line);
}

table {
  width: 100%;
  min-width: 850px;
  border-collapse: collapse;
  background: #fff;
}

th {
  background: var(--maroon);
  color: #fff;
  font-size: 0.9rem;
  text-align: left;
}

td,
th {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
}

tbody tr:nth-child(odd) {
  background: #f7f7f7;
}

.accent {
  color: var(--red);
  font-weight: 800;
}

.warning {
  color: var(--maroon);
  font-weight: 800;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: 1180px;
  margin: 28px auto 0;
}

.image-grid.wide {
  grid-template-columns: 1.4fr 0.6fr;
}

.methods {
  background: var(--wash);
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
  max-width: 1180px;
  margin: 0 auto;
}

.method {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.mini-table {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

.mini-table div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 14px;
  border-left: 4px solid var(--maroon);
  background: #f8f8f8;
}

.mini-table span {
  color: var(--muted);
  font-weight: 700;
}

.mini-table strong {
  color: var(--red);
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.35rem;
}

.threshold-figure {
  max-width: 1180px;
  margin: 26px auto 0;
}

.takeaways {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 34px;
  align-items: start;
  max-width: 1264px;
  margin: 0 auto;
}

.takeaways ul {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.takeaways li {
  padding: 18px 20px;
  border-left: 5px solid var(--maroon);
  background: var(--wash);
  color: var(--ink);
  font-size: 1.08rem;
  line-height: 1.45;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 22px;
  padding: 24px 42px;
  background: var(--maroon);
  color: #fff;
  font-size: 0.95rem;
}

.site-footer a {
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (max-width: 980px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 18px 22px;
  }

  nav {
    flex-wrap: wrap;
    gap: 14px;
  }

  .hero {
    min-height: 640px;
    padding: 72px 24px 72px;
  }

  h1 {
    font-size: 3.05rem;
  }

  h2 {
    font-size: 2.05rem;
  }

  .section {
    padding: 64px 24px;
  }

  .metric-strip,
  .figure-band,
  .figure-band.reverse,
  .two-column,
  .image-grid,
  .image-grid.wide,
  .method-grid,
  .takeaways {
    grid-template-columns: 1fr;
  }

  .figure-band.reverse .figure-copy {
    order: 0;
  }

  .figure-copy {
    justify-self: start;
  }
}

@media (max-width: 620px) {
  h1 {
    font-size: 2.35rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero-copy {
    font-size: 1.14rem;
  }

  .site-footer,
  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }
}