:root {
  --paper: #f4eee4;
  --paper-deep: #ebe3d4;
  --card: #fbf7f0;
  --ink: #1c1915;
  --ink-soft: #5c554c;
  --rule: #d4c9b8;
  --copper: #2f6b5a;
  --copper-deep: #1f4a3e;
  --vermillion: #c4452d;
  --vermillion-soft: #e8c4bb;
  --shadow: 0 18px 50px rgba(28, 25, 21, 0.08);
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --display: "Fraunces", "Source Serif 4", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 40;
  opacity: 0.07;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

button,
input {
  font: inherit;
}

.page {
  position: relative;
  overflow-x: hidden;
}

.wrap {
  width: min(1120px, calc(100% - 88px));
  margin: 0 auto;
}

.kicker {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper-deep);
  margin: 0 0 12px;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 0;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid color-mix(in srgb, var(--rule) 70%, transparent);
}

.wordmark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 22px;
  text-decoration: none;
  letter-spacing: -0.03em;
}

.wordmark em {
  font-style: italic;
  color: var(--vermillion);
  font-weight: 400;
}

.nav-links {
  display: flex;
  gap: 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
}

.nav-links a:hover {
  color: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 11px 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

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

.btn-ghost {
  background: transparent;
  color: var(--ink);
}

.hero {
  padding: 72px 0 88px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: end;
}

.stamp {
  display: inline-block;
  border: 1.5px solid var(--vermillion);
  color: var(--vermillion);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 6px 10px;
  transform: rotate(-6deg);
  margin-bottom: 22px;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.035em;
  line-height: 1.08;
  margin: 0;
}

h1 {
  font-size: clamp(42px, 6.4vw, 76px);
}

h1 .mark {
  font-style: italic;
  font-weight: 400;
  background-image: linear-gradient(transparent 68%, color-mix(in srgb, var(--vermillion) 28%, transparent) 68%);
}

.lede {
  font-size: 21px;
  color: var(--ink-soft);
  max-width: 38ch;
  margin: 22px 0 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-aside {
  position: relative;
  background: var(--card);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
  padding: 28px 26px 22px;
  min-height: 320px;
}

.hero-aside::before {
  content: "FIELD NOTE 01";
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.note-path {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.step {
  display: grid;
  grid-template-columns: 18px 1fr;
  gap: 12px;
  align-items: start;
  font-size: 15px;
}

.dot {
  width: 10px;
  height: 10px;
  margin-top: 7px;
  border-radius: 50%;
  background: var(--copper);
}

.dot.leave {
  background: var(--vermillion);
}

.annotation {
  position: absolute;
  right: -18px;
  bottom: 42px;
  width: 150px;
  font-family: var(--display);
  font-style: italic;
  font-size: 17px;
  color: var(--vermillion);
  transform: rotate(8deg);
}

.section {
  padding: 88px 0;
}

.section-rule {
  border-top: 1px solid var(--rule);
}

.split {
  display: grid;
  grid-template-columns: 0.42fr 0.58fr;
  gap: 56px;
}

h2 {
  font-size: clamp(32px, 4vw, 48px);
}

.quote {
  font-family: var(--display);
  font-size: clamp(26px, 3vw, 34px);
  font-style: italic;
  font-weight: 400;
  line-height: 1.25;
  margin: 0 0 28px;
}

.beats {
  display: grid;
  gap: 18px;
}

.beat {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px dashed var(--rule);
}

.beat strong {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.beat p {
  margin: 0;
  color: var(--ink-soft);
}

.philosophy {
  background:
    repeating-linear-gradient(
      transparent,
      transparent 31px,
      color-mix(in srgb, var(--rule) 55%, transparent) 32px
    );
  background-color: var(--paper-deep);
}

.philosophy-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.big-claim {
  font-size: clamp(36px, 5vw, 58px);
}

.claim-body {
  color: var(--ink-soft);
  font-size: 19px;
}

.pillars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.pillar {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 18px;
}

.pillar h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.pillar p {
  margin: 0;
  font-size: 15px;
  color: var(--ink-soft);
}

.model-head {
  max-width: 46ch;
  margin-bottom: 40px;
}

.chain {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 10px;
  position: relative;
}

.chain::before {
  content: "";
  position: absolute;
  top: 23px;
  left: 8%;
  right: 8%;
  height: 1px;
  background: var(--copper);
  opacity: 0.35;
}

.node {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 16px 12px 18px;
  min-height: 168px;
  position: relative;
  animation: rise 0.7s ease both;
}

.node:nth-child(2) { animation-delay: 0.05s; }
.node:nth-child(3) { animation-delay: 0.1s; }
.node:nth-child(4) { animation-delay: 0.15s; }
.node:nth-child(5) { animation-delay: 0.2s; }
.node:nth-child(6) { animation-delay: 0.25s; }
.node:nth-child(7) { animation-delay: 0.3s; }

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.num {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--copper);
}

.node h3 {
  font-size: 17px;
  margin: 10px 0 8px;
}

.node p {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.example-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 28px;
}

.tabs {
  display: flex;
  gap: 8px;
  margin: 20px 0 24px;
}

.tab {
  border: 1px solid var(--rule);
  background: transparent;
  padding: 8px 12px;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tab.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.dossier {
  background: var(--card);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
  padding: 26px;
}

.meta-row {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.inference {
  font-family: var(--display);
  font-size: 26px;
  font-style: italic;
  line-height: 1.25;
  margin: 18px 0 22px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.chip {
  border: 1px solid var(--rule);
  background: transparent;
  padding: 7px 10px;
  font-size: 13px;
  cursor: pointer;
}

.chip.support {
  border-color: var(--copper);
  color: var(--copper-deep);
}

.chip.contradict {
  border-color: var(--vermillion);
  color: var(--vermillion);
}

.chip.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.alt-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.alt-list button {
  width: 100%;
  text-align: left;
  background: var(--paper);
  border: 1px solid var(--rule);
  padding: 10px 12px;
  cursor: pointer;
}

.alt-list button.picked {
  border-color: var(--copper);
  box-shadow: inset 3px 0 0 var(--copper);
}

.confidence {
  margin-top: 22px;
}

.confidence-track {
  height: 8px;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  overflow: hidden;
}

.confidence-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--copper), #4e8f78);
  width: 0;
  transition: width 0.45s ease;
}

.session {
  border: 1px dashed var(--rule);
  padding: 22px;
  background:
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 23px,
      color-mix(in srgb, var(--rule) 40%, transparent) 24px
    );
}

.session h3 {
  font-size: 20px;
  margin-bottom: 16px;
}

.flow {
  display: grid;
  gap: 0;
}

.flow-item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  padding: 10px 0;
}

.flow-item span {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--vermillion);
}

.audience-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 28px;
}

.card-stack {
  display: grid;
  gap: 14px;
}

.who-card {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 22px 22px 18px;
}

.who-card h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.who-card p {
  margin: 0;
  color: var(--ink-soft);
}

.not-for {
  background: var(--ink);
  color: var(--paper);
  padding: 28px;
}

.not-for h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

.not-for ul {
  margin: 0;
  padding-left: 18px;
  color: color-mix(in srgb, var(--paper) 82%, #fff);
}

.output-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 28px;
}

.output-item {
  border-top: 2px solid var(--ink);
  padding-top: 12px;
}

.output-item span {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper-deep);
}

.output-item p {
  margin: 8px 0 0;
  font-size: 16px;
}

.waitlist {
  background: var(--paper-deep);
}

.wait-box {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

form {
  display: grid;
  gap: 10px;
}

label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

input[type="email"] {
  border: 1px solid var(--ink);
  background: var(--card);
  padding: 14px 14px;
  outline: none;
}

input[type="email"]:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--copper) 25%, transparent);
}

.form-note {
  margin: 0;
  font-size: 14px;
  color: var(--ink-soft);
}

.success {
  border: 1px solid var(--copper);
  background: var(--card);
  padding: 22px;
}

.success.hidden,
.hidden {
  display: none !important;
}

.footer {
  padding: 28px 0 48px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

@media (max-width: 900px) {
  .wrap {
    width: min(1120px, calc(100% - 48px));
  }

  .nav-links {
    display: none;
  }

  .hero,
  .split,
  .philosophy-inner,
  .example-grid,
  .audience-grid,
  .wait-box,
  .chain,
  .output-list,
  .pillars {
    grid-template-columns: 1fr;
  }

  .chain {
    grid-template-columns: 1fr 1fr;
  }

  .chain::before {
    display: none;
  }

  .annotation {
    position: static;
    transform: none;
    display: block;
    margin-top: 18px;
  }

  .hero {
    padding-top: 40px;
  }

  .section {
    padding: 64px 0;
  }
}