:root {
  --paper: #fafaf8;
  --card: #ffffff;
  --ink: #1a1a1a;
  --muted: #4a4a4a;
  --cold: #1b365d;
  --warm: #8b2635;
  --line: rgba(27, 54, 93, 0.16);
  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

button {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
  padding: 0.8rem clamp(1.25rem, 4vw, 4rem);
  border-bottom: 1px solid var(--line);
  background: rgba(250, 250, 248, 0.92);
  backdrop-filter: blur(12px);
}

.brand {
  font-family: var(--serif);
  font-size: 1.35rem;
}

.header-actions,
.language-switch {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.header-actions > a,
.language-switch {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.language-switch a {
  color: var(--muted);
  cursor: pointer;
  padding: 0.25rem;
}

.language-switch a[aria-current='page'] {
  color: var(--warm);
  font-weight: 600;
}

.shell {
  width: min(1080px, calc(100% - 3rem));
  margin: 0 auto;
}

.hero {
  border-bottom: 1px solid var(--line);
}

.hero .shell {
  padding-block: clamp(5rem, 12vw, 9rem);
}

.machine-kicker,
.side-label {
  margin: 0;
  color: var(--warm);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 940px;
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(3.4rem, 8vw, 6.8rem);
  font-weight: 300;
  letter-spacing: -0.035em;
  line-height: 0.93;
}

.machine-kicker + h1 {
  margin-top: 1.8rem;
}

.hero-lead {
  max-width: 820px;
  margin: 2.5rem 0 0;
  color: var(--cold);
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.6vw, 2.7rem);
  line-height: 1.15;
}

.content-shell {
  width: min(1000px, calc(100% - 3rem));
}

.section,
.split-section {
  padding-block: clamp(4rem, 9vw, 7rem);
  border-bottom: 1px solid var(--line);
}

.split-section {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 2rem;
}

.prose {
  max-width: 720px;
}

.prose p,
.section-intro,
.human-section > p {
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  line-height: 1.8;
}

.prose p + p {
  margin-top: 1.3rem;
}

h2 {
  max-width: 780px;
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(2.6rem, 5.2vw, 4.5rem);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1;
}

.reasons {
  margin-top: 3.5rem;
}

.reasons article {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 1.25rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
}

.reasons article > span {
  color: var(--warm);
  font-family: var(--mono);
  font-size: 0.8rem;
}

.reasons h3 {
  margin-bottom: 0;
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  font-weight: 400;
  line-height: 1.1;
}

.reasons p {
  max-width: 700px;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.criteria-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.5rem;
}

.criteria {
  padding: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 4px solid;
}

.criteria.positive {
  border-color: var(--cold);
  background: rgba(27, 54, 93, 0.045);
}

.criteria.negative {
  border-color: var(--warm);
  background: rgba(139, 38, 53, 0.045);
}

.criteria h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

.criteria ul,
.protocol ul {
  margin: 2rem 0 0;
  padding: 0;
  list-style: none;
}

.criteria li {
  position: relative;
  padding-left: 1.7rem;
}

.criteria li + li,
.protocol li + li {
  margin-top: 1.1rem;
}

.criteria li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 0.48rem;
  height: 0.48rem;
  border-radius: 50%;
  font-family: var(--mono);
}

.criteria.positive li::before {
  background: var(--cold);
}

.criteria.negative li::before {
  background: var(--warm);
}

.relay-section h2,
.section .side-label + h2 {
  margin-top: 1rem;
}

blockquote {
  margin: 2.5rem 0 0;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-left: 4px solid var(--warm);
  background: var(--card);
  box-shadow: 0 12px 40px rgba(27, 54, 93, 0.07);
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1.35;
}

.copy-button {
  margin-top: 1.4rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--cold);
  border-radius: 2px;
  background: transparent;
  color: var(--cold);
  cursor: pointer;
}

.copy-button:hover,
.copy-button:focus-visible {
  background: var(--cold);
  color: var(--paper);
}

.section-intro {
  max-width: 700px;
  margin-top: 1.5rem;
  color: var(--muted);
}

.record {
  margin: 2.5rem 0 0;
  border-top: 1px solid var(--line);
}

.record > div {
  display: grid;
  grid-template-columns: 190px 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.record dt {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.record dd {
  margin: 0;
}

.machine-links,
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.machine-links a {
  color: var(--cold);
  font-family: var(--mono);
  font-size: 0.82rem;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.protocol-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3rem;
  margin-top: 3rem;
}

.protocol h3 {
  color: var(--cold);
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.protocol-grid > div:last-child h3 {
  color: var(--warm);
}

.protocol li {
  padding-left: 1.2rem;
  text-indent: -1.2rem;
}

.protocol li::before {
  content: '';
  display: inline-block;
  width: 0.42rem;
  height: 0.42rem;
  margin: 0 0.78rem 0.12rem 0;
  border-radius: 50%;
  background: var(--cold);
}

.protocol-grid > div:last-child li::before {
  background: var(--warm);
}

.ask-first {
  margin: 3rem 0 0;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(139, 38, 53, 0.32);
  border-bottom: 1px solid rgba(139, 38, 53, 0.32);
  color: var(--warm);
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-style: italic;
  line-height: 1.35;
}

.actions a {
  padding: 0.8rem 1rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--cold);
  font-size: 0.88rem;
  font-weight: 500;
}

.actions a.primary {
  border-color: var(--cold);
  background: var(--cold);
  color: var(--paper);
}

.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  width: min(1000px, calc(100% - 3rem));
  margin: 0 auto;
  padding: 2rem 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.page-footer p {
  margin: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
  }

  .header-actions {
    align-items: flex-end;
    flex-direction: column;
  }

  .split-section,
  .criteria-grid,
  .protocol-grid,
  .record > div {
    grid-template-columns: 1fr;
  }

  .reasons article {
    grid-template-columns: 42px 1fr;
  }

  .page-footer {
    flex-direction: column;
  }
}