/* Advanced Technical Analytics System Lab — atas-lab.org
   Light editorial / technical-lab aesthetic.
   Palette: paper #F2EFE7 · ink #1E2223 · accent #2F5D3A · muted #6B6F6A · rule #D8D3C6
   System font stacks only. No external assets. No scripts. */

:root {
  --paper: #F2EFE7;
  --ink: #1E2223;
  --accent: #2F5D3A;
  --muted: #6B6F6A;
  --rule: #D8D3C6;
  --serif: "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: 0.004em;
}

.wrap {
  width: 100%;
  max-width: 920px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- Masthead (no navigation: footer-only nav model) ---------- */
.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 10;
}
.masthead .wrap {
  display: flex;
  align-items: center;
  min-height: 62px;
}
.wordmark {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 12px;
}
.wordmark .mark {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--paper);
  background: var(--accent);
  padding: 4px 7px;
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero {
  padding: 84px 0 60px;
  border-bottom: 1px solid var(--rule);
}
.kicker {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.kicker b { color: var(--accent); font-weight: 600; }
.hero h1 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(30px, 5.4vw, 50px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  max-width: 20ch;
}
.lede {
  margin: 0;
  font-size: 20px;
  line-height: 1.5;
  color: #333839;
  max-width: 56ch;
}
.hero .hero-note {
  margin: 26px 0 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  padding-left: 14px;
  border-left: 2px solid var(--accent);
}

/* ---------- Generic section ---------- */
.section {
  padding: 62px 0;
  border-bottom: 1px solid var(--rule);
}
.section h2 {
  margin: 0 0 26px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -0.005em;
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.section h2 .idx {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.section p { max-width: 68ch; }
.section p + p { margin-top: 1.1em; }
.lead-in {
  font-size: 18px;
  color: #333839;
}

/* ---------- Figures ---------- */
figure {
  margin: 34px 0 0;
  border: 1px solid var(--rule);
  background: #fff;
  padding: 10px;
}
figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #E7E3D8;
}
figcaption {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- Focus-area cards ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 22px;
  margin-top: 34px;
}
.card {
  border: 1px solid var(--rule);
  border-top: 3px solid var(--accent);
  background: #FAF8F2;
  padding: 24px 22px 22px;
}
.card .no {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
}
.card h3 {
  margin: 12px 0 10px;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 21px;
  line-height: 1.2;
}
.card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.6;
  color: #3B4041;
}

/* ---------- Method list ---------- */
.principles {
  list-style: none;
  counter-reset: p;
  margin: 34px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.principles li {
  counter-increment: p;
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--rule);
}
.principles li::before {
  content: counter(p, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.06em;
  padding-top: 3px;
}
.principles strong {
  font-weight: 600;
  font-family: var(--sans);
}
.principles span { color: #3B4041; }

/* ---------- Contact + form ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 42px;
  margin-top: 12px;
}
.mailto {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--accent);
}
form {
  margin: 0;
}
.field { margin-bottom: 18px; }
label {
  display: block;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 7px;
}
input, textarea {
  width: 100%;
  font-family: var(--sans);
  font-size: 16px;
  color: var(--ink);
  background: #FBFAF6;
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 11px 12px;
}
input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
}
textarea { min-height: 128px; resize: vertical; }
button {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--accent);
  border: 0;
  padding: 13px 24px;
  border-radius: 2px;
  cursor: pointer;
}
button:hover { background: #24482D; }

/* ---------- Footer (footer-only navigation) ---------- */
.site-footer {
  background: var(--ink);
  color: #C9CCC7;
  padding: 52px 0 40px;
  font-size: 14.5px;
}
.site-footer .foot-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 28px;
  padding-bottom: 26px;
  border-bottom: 1px solid #363B3B;
}
.site-footer .foot-brand {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--paper);
  margin: 0;
}
.site-footer .foot-brand small {
  display: block;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: #8B917F;
  margin-top: 8px;
}
.foot-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  align-items: center;
}
.foot-nav a {
  color: #C9CCC7;
  text-decoration: none;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
}
.foot-nav a:hover { color: #fff; border-bottom-color: var(--accent); }
.foot-bottom {
  margin-top: 24px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  color: #8B917F;
}
.foot-bottom .domain {
  font-family: var(--mono);
  letter-spacing: 0.08em;
  color: #A9AF9C;
}

/* ---------- Thank-you page ---------- */
.thanks {
  min-height: 68vh;
  display: flex;
  align-items: center;
  padding: 70px 0;
}
.thanks h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(28px, 4.6vw, 42px);
  margin: 0 0 18px;
}
.thanks p { max-width: 60ch; }
.btn-back {
  display: inline-block;
  margin-top: 26px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  background: var(--accent);
  padding: 13px 22px;
  border-radius: 2px;
}
.btn-back:hover { background: #24482D; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .hero { padding: 56px 0 42px; }
  .section { padding: 46px 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 30px; }
  .principles li { grid-template-columns: 40px 1fr; gap: 12px; }
}