:root {
  --paper: #f7f4ee;
  --tint: #efeadf;
  --ink: #16130e;
  --ink-soft: #4c463c;
  --ink-faint: #8a8272;
  --accent: #1f3cff;
  --line: #d9d2c2;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.container { max-width: 1120px; margin: 0 auto; padding: 0 32px; }

/* Scroll reveal */
[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity .9s cubic-bezier(.16,1,.3,1), transform .9s cubic-bezier(.16,1,.3,1);
  transition-delay: var(--d, 0s);
}
[data-reveal].revealed { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* Nav */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: rgba(247,244,238,.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  max-width: 1120px; margin: 0 auto; padding: 18px 32px;
  display: flex; align-items: center; justify-content: space-between;
}
.wordmark { font-family: var(--serif); font-size: 22px; font-weight: 700; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.wordmark-dot { color: var(--accent); }
.nav-links a {
  color: var(--ink-soft); text-decoration: none; font-size: 14px; margin-left: 28px;
  transition: color .2s;
}
.nav-links a:hover { color: var(--accent); }

/* Hero */
.hero { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; position: relative; padding: 120px 0 60px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: .18em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 22px;
}
.hero-title {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1.04; letter-spacing: -.02em; margin-bottom: 28px;
}
.hero-sub { font-size: 19px; color: var(--ink-soft); max-width: 52ch; margin-bottom: 36px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 26px; border-radius: 999px;
  background: var(--ink); color: var(--paper); text-decoration: none; font-size: 15px; font-weight: 600;
  transition: transform .25s, background .25s;
}
.btn:hover { background: var(--accent); transform: translateY(-2px); }
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: transparent; }
.hero-visual canvas { width: 100%; height: auto; display: block; }
.canvas-caption { font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); margin-top: 10px; text-align: center; }
.scroll-hint { position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%); }
.scroll-hint span {
  display: block; width: 1px; height: 52px; background: var(--ink-faint);
  animation: hint 2.2s ease-in-out infinite; transform-origin: top;
}
@keyframes hint { 0%,100% { transform: scaleY(.3); opacity:.4 } 50% { transform: scaleY(1); opacity:1 } }

/* Sections */
.section { padding: 130px 0; }
.section-tint { background: var(--tint); }
.section-title {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.08; letter-spacing: -.02em; margin-bottom: 28px;
}
.section-lede { font-size: 19px; color: var(--ink-soft); max-width: 62ch; margin-bottom: 64px; }

/* Problem */
.problem-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 48px; }
.problem-card {
  background: #fffdf8; border: 1px solid var(--line); border-radius: 14px; padding: 30px 26px;
  transition: transform .3s, box-shadow .3s;
}
.problem-card:hover { transform: translateY(-4px); box-shadow: 0 14px 34px rgba(22,19,14,.08); }
.problem-card h3 { font-family: var(--serif); font-size: 21px; margin-bottom: 12px; }
.problem-card p { font-size: 15px; color: var(--ink-soft); }

/* Steps */
.steps { list-style: none; }
.step {
  display: grid; grid-template-columns: 110px 1fr; gap: 32px;
  padding: 44px 0; border-top: 1px solid var(--line);
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step-num { font-family: var(--serif); font-size: 44px; color: var(--accent); line-height: 1; }
.step h3 { font-family: var(--serif); font-size: 26px; margin-bottom: 12px; }
.step p { color: var(--ink-soft); max-width: 66ch; }
.callout {
  margin-top: 56px; padding: 34px 38px; border-left: 3px solid var(--accent);
  background: #fffdf8; border-radius: 0 14px 14px 0;
}
.callout p { font-family: var(--serif); font-size: 22px; line-height: 1.45; }

/* Difficulty */
.dial-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 56px; margin-top: 40px; align-items: start; }
.dial-item { padding: 26px 0; border-top: 1px solid var(--line); }
.dial-item:first-child { border-top: none; padding-top: 0; }
.dial-item h3 { font-family: var(--serif); font-size: 23px; margin-bottom: 10px; }
.dial-item p { color: var(--ink-soft); font-size: 15.5px; }
.dial-widget {
  background: var(--ink); color: var(--paper); border-radius: 18px; padding: 36px 34px;
  position: sticky; top: 110px;
}
.dial-widget-title { font-family: var(--serif); font-size: 22px; margin-bottom: 26px; }
.dial-row { margin-bottom: 22px; }
.dial-row label { display: flex; justify-content: space-between; font-size: 14px; color: #b9b2a3; margin-bottom: 10px; }
.dial-row output { font-family: var(--mono); color: var(--paper); }
.dial-row input[type=range] { width: 100%; accent-color: var(--accent); height: 4px; cursor: pointer; }
.dial-result { margin: 30px 0 14px; text-align: center; }
.dial-result-num { font-family: var(--serif); font-size: 64px; font-weight: 700; display: block; line-height: 1; color: #fff; }
.dial-result-label { font-family: var(--mono); font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: #b9b2a3; }
.dial-note { font-size: 13px; color: #b9b2a3; text-align: center; }

/* Domains */
.domain-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-top: 48px; }
.domain-card {
  background: #fffdf8; border: 1px solid var(--line); border-radius: 14px; padding: 32px 28px;
  transition: transform .3s, box-shadow .3s;
}
.domain-card:hover { transform: translateY(-4px); box-shadow: 0 14px 34px rgba(22,19,14,.08); }
.domain-flagship { grid-column: 1 / -1; background: var(--ink); color: var(--paper); border-color: var(--ink); }
.domain-flagship p { color: #b9b2a3; }
.domain-tag {
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
.domain-flagship .domain-tag { color: #7f93ff; }
.domain-card h3 { font-family: var(--serif); font-size: 23px; margin-bottom: 10px; }
.domain-card p { font-size: 15px; color: var(--ink-soft); }

/* Evidence */
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px 56px; margin: 56px 0 72px; }
.stat { border-top: 1px solid var(--line); padding-top: 24px; }
.stat-num { font-family: var(--serif); font-size: 52px; font-weight: 700; letter-spacing: -.02em; line-height: 1; margin-bottom: 14px; }
.stat-num span { color: var(--accent); }
.stat-label { font-size: 15px; color: var(--ink-soft); margin-bottom: 12px; }
.stat-src { font-family: var(--mono); font-size: 11.5px; color: var(--ink-faint); }

.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border: 1px solid var(--line); border-radius: 14px; background: #fffdf8; }
.compare-table { border-collapse: collapse; width: 100%; min-width: 720px; font-size: 14px; }
.compare-table th, .compare-table td { text-align: left; padding: 16px 18px; border-bottom: 1px solid var(--line); vertical-align: top; }
.compare-table thead th { font-family: var(--mono); font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); background: var(--tint); }
.compare-table th:last-child, .compare-table td:last-child { color: var(--accent); font-weight: 600; }
.compare-table tbody tr:last-child td { border-bottom: none; }
.compare-table td:first-child { font-weight: 600; color: var(--ink); white-space: nowrap; }

.sources { margin-top: 40px; }
.sources-title { font-family: var(--mono); font-size: 11.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 10px; }
.sources ul { list-style: none; }
.sources li { font-family: var(--mono); font-size: 12.5px; color: var(--ink-faint); padding: 3px 0; }

/* Closing */
.closing { background: var(--ink); color: var(--paper); text-align: center; padding: 150px 0; }
.closing-title {
  font-family: var(--serif); font-weight: 700;
  font-size: clamp(30px, 4.4vw, 54px); line-height: 1.15; letter-spacing: -.02em; margin-bottom: 28px;
}
.closing-sub { font-family: var(--mono); font-size: 14px; letter-spacing: .18em; text-transform: uppercase; color: #7f93ff; }

/* Footer */
.footer { background: var(--ink); border-top: 1px solid #2c2820; padding: 34px 0; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.footer .wordmark { color: var(--paper); }
.footer-note { font-size: 13px; color: #8a8272; }

/* Mobile */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .hero { padding-top: 110px; min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
  .section { padding: 90px 0; }
  .problem-grid, .domain-grid, .stat-grid { grid-template-columns: 1fr; }
  .dial-grid { grid-template-columns: 1fr; gap: 40px; }
  .dial-widget { position: static; }
  .step { grid-template-columns: 64px 1fr; gap: 20px; }
  .step-num { font-size: 30px; }
  .container { padding: 0 22px; }
  .scroll-hint { display: none; }
}

/* Screenshot/print mode (?reveal=all): keep hero compact so full-page captures work */
.shot .hero { min-height: auto; padding: 140px 0 90px; }
.shot .scroll-hint { display: none; }
.shot [data-reveal] { transition: none !important; opacity: 1 !important; transform: none !important; }

/* contact CTA on dark closing section */
.closing .hero-cta { justify-content: center; margin-top: 34px; }
.closing .btn-light { background: var(--paper); color: var(--ink); }
.closing .btn-light:hover { background: var(--accent); color: var(--paper); }
.footer-note a { color: inherit; }