:root {
  --bg: #f4f0e8;
  --bg-soft: rgba(255, 255, 255, 0.68);
  --bg-strong: rgba(255, 255, 255, 0.84);
  --surface: rgba(255, 255, 255, 0.74);
  --surface-strong: rgba(255, 255, 255, 0.9);
  --text: #101415;
  --muted: #4f5858;
  --accent: #568c3f;
  --accent-strong: #396628;
  --copper: #b06a31;
  --line: rgba(16, 20, 21, 0.11);
  --line-strong: rgba(16, 20, 21, 0.18);
  --shadow: 0 24px 80px rgba(39, 44, 36, 0.08);
  --max-width: 1240px;
  --radius-xl: 2rem;
  --radius-lg: 1.3rem;
  --radius-md: 1rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(86, 140, 63, 0.14), transparent 28%),
    radial-gradient(circle at 90% 18%, rgba(176, 106, 49, 0.13), transparent 26%),
    linear-gradient(180deg, #faf6ee 0%, #f4f0e8 48%, #efe8dd 100%);
  font-family: "Avenir Next", "Segoe UI Variable Text", "Trebuchet MS", sans-serif;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(16, 20, 21, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16, 20, 21, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 80%);
  pointer-events: none;
}

.page-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 20% 40%, rgba(86, 140, 63, 0.06) 0 1px, transparent 1px),
    radial-gradient(circle at 75% 24%, rgba(176, 106, 49, 0.08) 0 1px, transparent 1px),
    radial-gradient(circle at 62% 78%, rgba(16, 20, 21, 0.05) 0 1px, transparent 1px);
  background-size: 180px 180px;
  pointer-events: none;
}

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

a {
  color: inherit;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: #ffffff;
  color: #000000;
}

.skip-link:focus {
  top: 1rem;
}

.site-frame {
  width: min(var(--max-width), calc(100% - 2rem));
  margin: 0 auto;
  padding-bottom: 4rem;
}

.section {
  margin-top: 4.5rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 0 0.9rem;
  transition: backdrop-filter 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.topbar.is-scrolled {
  backdrop-filter: blur(18px);
  background: rgba(244, 240, 232, 0.74);
  box-shadow: 0 8px 30px rgba(39, 44, 36, 0.08);
}

.brand {
  display: inline-flex;
  align-items: center;
  max-width: 15rem;
}

.brand img {
  width: 100%;
  height: auto;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.7rem;
}

.nav a {
  padding: 0.72rem 0.95rem;
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.56);
  color: var(--muted);
  transition: border-color 180ms ease, color 180ms ease, transform 180ms ease, background-color 180ms ease;
}

.nav a:hover,
.nav a[aria-current="true"] {
  color: var(--text);
  border-color: rgba(57, 102, 40, 0.34);
  background: rgba(255, 255, 255, 0.82);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(300px, 0.95fr);
  gap: 1.5rem;
  align-items: stretch;
}

.card,
.hero-copy,
.info-card,
.contrast-card,
.bandwidth-panel,
.matrix,
.faq-list details,
.source-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--surface-strong), var(--surface));
  box-shadow: var(--shadow);
}

.hero-copy,
.card {
  border-radius: var(--radius-xl);
  padding: 2.1rem;
}

.hero-copy {
  position: relative;
  overflow: hidden;
}

.hero-copy::after {
  content: "";
  position: absolute;
  right: -5rem;
  top: -5rem;
  width: 13rem;
  height: 13rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(86, 140, 63, 0.2), transparent 70%);
}

.eyebrow,
.timeline-year,
.source-kicker,
.trust-strip,
.panel-note {
  font-family: "SF Mono", "SFMono-Regular", "PT Mono", "Andale Mono", monospace;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent-strong);
  font-size: 0.84rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1,
h2,
h3,
summary {
  margin: 0;
  font-family: "Futura", "Avenir Next Condensed", "Avenir Next", sans-serif;
  letter-spacing: -0.03em;
}

h1 {
  max-width: 10ch;
  font-size: clamp(3rem, 6vw, 5.8rem);
  line-height: 0.92;
}

h2 {
  font-size: clamp(1.8rem, 3.4vw, 3.1rem);
  line-height: 0.97;
}

h3 {
  font-size: 1.25rem;
  line-height: 1.1;
}

p {
  margin: 0;
  color: var(--muted);
  line-height: 1.72;
}

.hero-dek {
  max-width: 62ch;
  margin-top: 1.15rem;
  font-size: 1.06rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.8rem 1.15rem;
  border-radius: 999px;
  text-decoration: none;
  border: 1px solid transparent;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease, color 180ms ease;
}

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

.button-primary {
  background: var(--text);
  color: #f7f3eb;
}

.button-primary:hover {
  background: #1b2320;
}

.button-secondary {
  background: rgba(255, 255, 255, 0.76);
  color: var(--text);
  border-color: var(--line);
}

.button-secondary:hover {
  border-color: rgba(57, 102, 40, 0.34);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.2rem;
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 0.84rem;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.85rem;
  margin-top: 1.6rem;
}

.fact-card {
  padding: 1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.68);
}

.fact-card dt {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.fact-card dd {
  margin: 0.55rem 0 0;
  color: var(--text);
  font-family: "Futura", "Avenir Next Condensed", sans-serif;
  font-size: 1.35rem;
}

.visual-meta h2 {
  font-size: clamp(1.6rem, 3vw, 2.5rem);
}

.visual-meta p:last-child {
  margin-top: 0.8rem;
}

.fabric-svg {
  margin-top: 1.35rem;
}

.svg-gpu {
  fill: #f8f5ef;
  stroke: #bfc7bf;
  stroke-width: 2;
}

.svg-label {
  fill: #4d565f;
  font-family: "SF Mono", "SFMono-Regular", "PT Mono", monospace;
  font-size: 18px;
}

.svg-title {
  fill: #f1f4ee;
  font-size: 20px;
}

.section-heading {
  display: grid;
  gap: 0.85rem;
  max-width: 54rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.6rem;
}

.info-card,
.contrast-card,
.source-card {
  border-radius: var(--radius-lg);
  padding: 1.4rem;
}

.info-card h3,
.contrast-card h3,
.source-card h3,
.matrix-head h3,
.panel-head h3 {
  margin-bottom: 0.75rem;
}

.contrast-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

.contrast-card.accent {
  background: linear-gradient(180deg, rgba(86, 140, 63, 0.12), rgba(176, 106, 49, 0.09));
}

.timeline-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(280px, 0.9fr);
  gap: 1rem;
  margin-top: 1.6rem;
}

.timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.95rem;
}

.timeline-item {
  display: grid;
  grid-template-columns: 11rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
}

.timeline-item:first-child {
  border-top: 0;
  padding-top: 0;
}

.timeline-year {
  color: var(--accent-strong);
  font-size: 0.9rem;
}

.timeline-copy p {
  margin-top: 0.55rem;
}

.bandwidth-panel {
  border-radius: var(--radius-xl);
  padding: 1.5rem;
}

.panel-head {
  display: grid;
  gap: 0.5rem;
}

.bandwidth-rows {
  display: grid;
  gap: 0.9rem;
  margin-top: 1.25rem;
}

.bandwidth-row {
  display: grid;
  grid-template-columns: minmax(7rem, 8.5rem) minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.85rem;
}

.bandwidth-label {
  display: grid;
  gap: 0.1rem;
}

.bandwidth-label span,
.panel-note {
  color: var(--muted);
  font-size: 0.84rem;
}

.bandwidth-bar {
  height: 0.9rem;
  border-radius: 999px;
  background: rgba(16, 20, 21, 0.08);
  overflow: hidden;
}

.bandwidth-bar span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--copper));
}

.bandwidth-value {
  font-family: "SF Mono", "SFMono-Regular", monospace;
  font-size: 0.92rem;
}

.use-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.caution {
  background: linear-gradient(180deg, rgba(176, 106, 49, 0.09), rgba(255, 255, 255, 0.74));
}

.matrix {
  margin-top: 1rem;
  border-radius: var(--radius-xl);
  padding: 1.5rem;
}

.matrix-table {
  display: grid;
  margin-top: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.matrix-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.matrix-row:first-child {
  border-top: 0;
}

.matrix-row span {
  padding: 1rem;
  line-height: 1.6;
  color: var(--muted);
}

.matrix-header {
  background: rgba(255, 255, 255, 0.74);
}

.matrix-header span {
  color: var(--text);
  font-family: "SF Mono", "SFMono-Regular", monospace;
  font-size: 0.85rem;
}

.faq-list {
  display: grid;
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.faq-list details {
  border-radius: var(--radius-lg);
  padding: 1rem 1.1rem;
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  font-size: 1.1rem;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list p {
  margin-top: 0.85rem;
}

.sources-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.6rem;
}

.source-kicker {
  margin: 0 0 0.55rem;
  color: var(--accent-strong);
  font-size: 0.85rem;
}

.source-card a {
  text-decoration-thickness: 1px;
  text-underline-offset: 0.15em;
}

.footer {
  margin-top: 4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.footer p {
  max-width: 68ch;
  font-size: 0.93rem;
}

@media (max-width: 1080px) {
  .hero,
  .timeline-layout,
  .card-grid,
  .use-grid,
  .sources-grid,
  .contrast-grid {
    grid-template-columns: 1fr;
  }

  .hero-facts {
    grid-template-columns: 1fr;
  }

  .matrix-row {
    grid-template-columns: 1fr;
  }

  .matrix-row span {
    border-top: 1px solid rgba(16, 20, 21, 0.06);
  }

  .matrix-row span:first-child {
    border-top: 0;
  }
}

@media (max-width: 780px) {
  .site-frame {
    width: min(var(--max-width), calc(100% - 1rem));
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .hero-copy,
  .card,
  .bandwidth-panel,
  .matrix {
    padding: 1.3rem;
  }

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .bandwidth-row {
    grid-template-columns: 1fr;
    align-items: flex-start;
  }

  h1 {
    max-width: 11ch;
  }
}