:root {
  --bg: #efe6d7;
  --panel: rgba(255, 250, 243, 0.8);
  --panel-strong: #f8f2ea;
  --text: #241d17;
  --muted: #65584c;
  --line: rgba(36, 29, 23, 0.14);
  --accent: #b98938;
  --accent-strong: #8f6525;
  --dark: #191613;
  --dark-soft: #24201b;
  --white: #fffdf9;
  --shadow: 0 24px 60px rgba(27, 20, 14, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(185, 137, 56, 0.14), transparent 32%),
    linear-gradient(180deg, #f8f3ec 0%, var(--bg) 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(36, 29, 23, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 29, 23, 0.03) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.5), transparent 85%);
}

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

.site-shell {
  min-height: 100vh;
}

.hero,
.section,
.footer-inner {
  width: min(calc(100% - 48px), var(--max-width));
  margin: 0 auto;
}

.hero {
  padding: 24px 0 80px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 0 52px;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  background: linear-gradient(180deg, #d9b15f, #8f6525);
  box-shadow: 0 0 0 6px rgba(185, 137, 56, 0.12);
}

.eyebrow,
.brand-name,
.section-kicker,
.panel-label,
.timeline-phase,
.junction-label {
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow,
.section-kicker,
.panel-label,
.timeline-phase,
.junction-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
}

.brand-name {
  margin: 6px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
}

.ghost-link {
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  transition: transform 180ms ease, border-color 180ms ease, color 180ms ease;
}

.ghost-link:hover {
  transform: translateY(-1px);
  border-color: rgba(185, 137, 56, 0.45);
  color: var(--text);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 42px;
  align-items: end;
}

.hero-copy h1,
.section-heading h2,
.timeline-body h3,
.material-item h3,
.principle h3,
.junction-card h3 {
  margin: 0;
  font-family: "Cormorant Garamond", serif;
  font-weight: 600;
}

.hero-copy h1 {
  max-width: 8ch;
  font-size: clamp(4rem, 9vw, 7.4rem);
  line-height: 0.9;
}

.hero-summary {
  max-width: 34rem;
  margin: 24px 0 0;
  font-size: 1.06rem;
  line-height: 1.9;
  color: var(--muted);
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border-radius: 999px;
  transition: transform 180ms ease, background-color 180ms ease, border-color 180ms ease;
}

.button:active,
.ghost-link:active {
  transform: scale(0.97);
}

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

.button-primary:hover {
  transform: translateY(-1px);
  background: #11100e;
}

.button-secondary {
  border: 1px solid var(--line);
  color: var(--text);
  background: rgba(255, 253, 249, 0.6);
}

.button-secondary:hover {
  transform: translateY(-1px);
  border-color: rgba(185, 137, 56, 0.45);
}

.hero-panel {
  display: grid;
  gap: 18px;
}

.hero-card,
.airflow-diagram,
.material-item,
.timeline-body,
.junction-card,
.checklist {
  box-shadow: var(--shadow);
}

.hero-card,
.airflow-diagram {
  padding: 28px;
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: var(--radius-xl);
  background: var(--panel);
  backdrop-filter: blur(12px);
}

.metric-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

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

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

.metric-row strong {
  font-size: 1.02rem;
}

.airflow-diagram {
  background:
    linear-gradient(180deg, rgba(185, 137, 56, 0.08), rgba(255, 255, 255, 0.82)),
    var(--panel);
}

.airflow-plate {
  position: relative;
  display: grid;
  gap: 18px;
  margin: 18px 0;
  padding: 26px 18px;
  border-radius: var(--radius-lg);
  background: var(--dark-soft);
  color: var(--white);
}

.airflow-plate::before,
.airflow-plate::after {
  content: "";
  position: absolute;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, transparent, var(--accent), transparent);
}

.airflow-plate::before {
  top: -28px;
  height: 28px;
}

.airflow-plate::after {
  bottom: -28px;
  height: 28px;
}

.airflow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--muted);
}

.airflow::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
}

.airflow-out {
  justify-self: end;
}

.section {
  padding: 92px 0;
}

.section-heading {
  display: grid;
  gap: 14px;
}

.section-heading h2 {
  font-size: clamp(2.7rem, 5vw, 4.5rem);
  line-height: 0.95;
}

.section-summary {
  max-width: 38rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.8;
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 34px;
}

.principle {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.principle-index {
  display: inline-block;
  margin-bottom: 18px;
  font-family: "Cormorant Garamond", serif;
  font-size: 2rem;
  color: var(--accent);
}

.principle h3,
.material-item h3,
.timeline-body h3,
.junction-card h3 {
  font-size: 2rem;
  line-height: 1;
}

.principle p,
.material-item p,
.timeline-body li,
.junction-card p,
.check-item span {
  color: var(--muted);
  line-height: 1.9;
}

.section-dark {
  width: min(calc(100% - 24px), calc(var(--max-width) + 80px));
  padding: 78px 40px;
  border-radius: 40px;
  background:
    radial-gradient(circle at top right, rgba(185, 137, 56, 0.18), transparent 28%),
    linear-gradient(180deg, #1d1915 0%, #15120f 100%);
  color: var(--white);
}

.materials-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 34px;
}

.material-item {
  min-height: 188px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  background: rgba(255, 248, 241, 0.05);
}

.material-item p {
  color: rgba(255, 255, 255, 0.72);
}

.timeline {
  position: relative;
  display: grid;
  gap: 24px;
  margin-top: 34px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 17px;
  width: 1px;
  background: linear-gradient(180deg, rgba(185, 137, 56, 0.5), rgba(36, 29, 23, 0.1));
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 24px;
}

.timeline-node {
  width: 16px;
  height: 16px;
  margin-top: 24px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 6px rgba(185, 137, 56, 0.14);
}

.timeline-body {
  padding: 26px 28px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-lg);
  background: rgba(255, 253, 249, 0.7);
  backdrop-filter: blur(10px);
}

.timeline-body ul {
  margin: 18px 0 0;
  padding-left: 20px;
}

.section-detail {
  display: grid;
  gap: 32px;
}

.junction-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.junction-card {
  min-height: 240px;
  padding: 26px;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(36, 29, 23, 0.08);
  background: rgba(255, 251, 246, 0.72);
  backdrop-filter: blur(8px);
}

.junction-label {
  margin: 0 0 18px;
}

.footer {
  padding: 12px 0 80px;
}

.footer-inner {
  padding: 54px clamp(22px, 5vw, 52px);
  border-radius: 36px;
  background: linear-gradient(180deg, #201b16 0%, #15120f 100%);
  color: var(--white);
}

.checklist {
  margin-top: 30px;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.check-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.check-item + .check-item {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.check-item input {
  accent-color: var(--accent);
  inline-size: 18px;
  block-size: 18px;
  margin-top: 6px;
  flex: none;
}

.check-item span {
  color: rgba(255, 255, 255, 0.82);
}

.footer-note {
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.45);
  font-size: 0.92rem;
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 700ms ease,
    transform 700ms ease;
}

.reveal-delay {
  transition-delay: 140ms;
}

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

@media (max-width: 960px) {
  .hero-grid,
  .principles,
  .materials-grid,
  .junction-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-bottom: 52px;
  }

  .section,
  .section-dark {
    padding-top: 74px;
    padding-bottom: 74px;
  }

  .section-dark {
    padding-left: 22px;
    padding-right: 22px;
  }
}

@media (max-width: 680px) {
  .hero,
  .section,
  .footer-inner {
    width: min(calc(100% - 28px), var(--max-width));
  }

  .topbar {
    padding-bottom: 34px;
  }

  .hero-copy h1 {
    font-size: clamp(3rem, 18vw, 4.6rem);
  }

  .section-heading h2 {
    font-size: clamp(2.25rem, 13vw, 3.1rem);
  }

  .timeline-item {
    gap: 14px;
    grid-template-columns: 24px minmax(0, 1fr);
  }

  .timeline::before {
    left: 11px;
  }

  .timeline-node {
    width: 12px;
    height: 12px;
    margin-top: 23px;
  }

  .hero-card,
  .airflow-diagram,
  .timeline-body,
  .junction-card,
  .material-item,
  .checklist,
  .footer-inner {
    backdrop-filter: none;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .button {
    width: 100%;
  }
}