/* ============================================================================
   Empathic — Marketing site layer
   Built entirely on the design-system tokens. Paper is the editorial ground;
   ink sections drop in for product/trace moments.
   ========================================================================== */

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body { background: var(--surface-app); color: var(--text-body); }

/* ---------- Layout primitives ---------- */
.wrap { max-width: 1240px; margin: 0 auto; padding: 0 40px; }
.wrap-mid { max-width: 1000px; margin: 0 auto; padding: 0 40px; }
.wrap-narrow { max-width: 760px; margin: 0 auto; padding: 0 40px; }
@media (max-width: 720px) {
  .wrap, .wrap-mid, .wrap-narrow { padding: 0 22px; }
}

.section { padding: 112px 0; position: relative; }
.section-sm { padding: 72px 0; position: relative; }
.section-lg { padding: 140px 0; position: relative; }
@media (max-width: 720px) {
  .section { padding: 76px 0; }
  .section-lg { padding: 88px 0; }
  .section-sm { padding: 52px 0; }
}

/* Ink world — forensic dark ground */
.ink { background: var(--surface-app); color: var(--text-body); }
.ink-deep { background: var(--ink-1000); }

/* hairline rule */
.rule { height: 1px; background: var(--border-subtle); border: 0; }

/* ---------- Type helpers ---------- */
.eyebrow {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-faint);
  display: inline-flex; align-items: center; gap: 9px; white-space: nowrap;
}
.eyebrow::before {
  content: ""; width: 22px; height: 1px; background: var(--accent);
  display: inline-block;
}
.eyebrow.no-tick::before { display: none; }
.eyebrow.iris { color: var(--accent-text); }

.display {
  font-family: var(--font-editorial); font-weight: 400;
  letter-spacing: -0.02em; color: var(--text-strong);
  text-wrap: balance;
}
.serif { font-family: var(--font-editorial); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.sans { font-family: var(--font-ui); }

.lede {
  font-family: var(--font-ui); font-weight: 400;
  font-size: 21px; line-height: 32px; color: var(--text-muted);
  letter-spacing: -0.005em; text-wrap: pretty;
}
@media (max-width: 720px) { .lede { font-size: 18px; line-height: 28px; } }

.kicker-num {
  font-family: var(--font-mono); font-size: 12px; color: var(--text-faint);
  letter-spacing: 0.04em;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: var(--z-sticky);
  background: color-mix(in oklab, var(--surface-app) 82%, transparent);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}
.nav-inner {
  height: 64px; display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { display: inline-flex; align-items: center; gap: 11px; cursor: pointer; }
.nav-logo img { height: 17px; width: auto; display: block; }
.ink .nav-logo img, .nav.on-ink .nav-logo img { filter: invert(1); }
.nav-wordmark {
  font-family: var(--font-ui); font-weight: 500; font-size: 17px;
  letter-spacing: -0.01em; color: var(--text-strong);
}
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-link {
  font-family: var(--font-ui); font-size: 14px; font-weight: 500;
  color: var(--text-muted); text-decoration: none; letter-spacing: -0.005em;
  transition: color var(--dur-fast) var(--ease-standard);
}
.nav-link:hover { color: var(--text-strong); text-decoration: none; }
.nav-link.active { color: var(--text-strong); }
.nav-cta { display: flex; align-items: center; gap: 14px; }
@media (max-width: 860px) { .nav-links { display: none; } }

/* link reset for buttons-as-links */
a.btnlink { text-decoration: none; }
a.btnlink:hover { text-decoration: none; }

/* ---------- Buttons (marketing, token-built) ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: var(--font-ui); font-weight: 500; font-size: 15px;
  height: 44px; padding: 0 20px; border-radius: var(--radius-sm);
  border: 1px solid transparent; cursor: pointer; letter-spacing: -0.005em;
  transition: background var(--dur-fast) var(--ease-standard),
              border-color var(--dur-fast) var(--ease-standard),
              transform var(--dur-instant) var(--ease-standard);
  text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--text-on-accent); }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--surface-card); color: var(--text-strong); border-color: var(--border-default); }
.btn-secondary:hover { background: var(--surface-raised); border-color: var(--border-strong); }
.btn-ghost { background: transparent; color: var(--text-strong); border-color: var(--border-default); }
.btn-ghost:hover { background: var(--state-neutral-bg); }
.btn-sm { height: 36px; font-size: 14px; padding: 0 15px; }
.btn .arrow { transition: transform var(--dur-base) var(--ease-standard); }
.btn:hover .arrow { transform: translateX(3px); }

/* link with arrow */
.tlink {
  font-family: var(--font-ui); font-weight: 500; font-size: 15px;
  color: var(--accent-text); display: inline-flex; align-items: center; gap: 7px;
  text-decoration: none; letter-spacing: -0.005em;
}
.tlink:hover { text-decoration: none; color: var(--accent-hover); }
.tlink .arrow { transition: transform var(--dur-base) var(--ease-standard); }
.tlink:hover .arrow { transform: translateX(3px); }

/* ---------- Albers motif ---------- */
.albers { position: relative; overflow: hidden; }
.albers-layer {
  position: absolute; inset: 0; margin: auto;
  mix-blend-mode: screen;
}
.albers.on-light .albers-layer { mix-blend-mode: multiply; }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 24px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.g4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 980px) { .g3, .g4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 680px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg); padding: 26px;
}
.card-pad-lg { padding: 32px; }

/* feature tile */
.tile { padding: 28px; border: 1px solid var(--border-subtle); border-radius: var(--radius-lg);
  background: var(--surface-card); transition: border-color var(--dur-base) var(--ease-standard); }
.tile:hover { border-color: var(--border-strong); }
.tile-icon {
  width: 38px; height: 38px; border-radius: var(--radius-sm);
  display: inline-flex; align-items: center; justify-content: center;
  border: 1px solid var(--border-default); color: var(--text-strong);
  margin-bottom: 18px;
}
.tile h3 { font-family: var(--font-ui); font-weight: 500; font-size: 18px;
  letter-spacing: -0.01em; color: var(--text-strong); margin: 0 0 8px; }
.tile p { font-family: var(--font-ui); font-size: 15px; line-height: 23px;
  color: var(--text-muted); margin: 0; }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(16px); }
.reveal.in { opacity: 1; transform: none;
  transition: opacity 620ms var(--ease-emphasized), transform 620ms var(--ease-emphasized); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
}

/* ---------- Mono chip / pill ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-mono); font-size: 12px; color: var(--text-muted);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-pill);
  padding: 5px 12px; background: var(--surface-card);
}
.chip .dot { width: 7px; height: 7px; border-radius: 999px; background: var(--accent); }

/* logo wall */
.logowall { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 48px; }
.logoword { font-family: var(--font-ui); font-weight: 500; font-size: 19px;
  letter-spacing: -0.01em; color: var(--text-faint); opacity: 0.9; }

/* divider dot list */
.metarow { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-family: var(--font-mono); font-size: 12px; color: var(--text-faint); }
.metarow > span { white-space: nowrap; }
.metarow .sep { opacity: 0.5; }

/* ---------- Footer ---------- */
.footer { background: var(--ink-1000); color: var(--ink-200); padding: 72px 0 40px; }
.footer a { color: var(--ink-250); text-decoration: none; font-family: var(--font-ui); font-size: 14px; }
.footer a:hover { color: var(--ink-50); text-decoration: none; }
.foot-grid { display: grid; grid-template-columns: 1.6fr repeat(4, 1fr); gap: 32px; }
@media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr 1fr; gap: 36px 24px; } }
.foot-h { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.12em;
  text-transform: uppercase; color: var(--ink-400); margin-bottom: 16px; }
.foot-col { display: flex; flex-direction: column; gap: 11px; }

/* selection-safe focus for keyboard users */
.btn:focus-visible, .nav-link:focus-visible, .tlink:focus-visible { box-shadow: var(--focus-ring); }

/* ---------- Lab / research-figure textures ---------- */
:root { --grid-line: rgba(33,32,58,0.055); }
[data-theme="dark"] { --grid-line: rgba(227,226,254,0.05); }
.lab-grid {
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 52px 52px;
}
.lab-grid-fine { background-size: 26px 26px; }

/* ---------- Page responsive collapses ---------- */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr !important; gap: 40px !important; }
  .hero-art { max-width: 560px; }
  .hero-histo { display: none; }
  .metrics-field { display: none; }
  .prob-grid { grid-template-columns: 1fr !important; }
  .metrics-grid { grid-template-columns: 1fr !important; }
  .metric-cell { border-right: none !important; border-bottom: 1px solid var(--border-subtle); }
  .sec-grid { grid-template-columns: 1fr !important; gap: 36px !important; }
}
@media (max-width: 760px) {
  .hero-grid h1.display { font-size: 46px !important; line-height: 50px !important; }
  .display { font-size: 34px !important; line-height: 40px !important; }
  .sec-items { grid-template-columns: 1fr !important; }
}
@media (max-width: 560px) {
  .pricing-cols { grid-template-columns: 1fr !important; }
}

/* ---------- Pricing ---------- */
.price-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0;
  border: 1px solid var(--border-default); border-radius: var(--radius-lg); overflow: hidden; }
.price-col { padding: 34px 30px; border-right: 1px solid var(--border-subtle); }
.price-col:last-child { border-right: none; }
.price-col.feature { background: var(--surface-raised); position: relative; }
@media (max-width: 860px) {
  .price-grid { grid-template-columns: 1fr; }
  .price-col { border-right: none; border-bottom: 1px solid var(--border-subtle); }
  .price-col:last-child { border-bottom: none; }
}
.price-feat-row { display: flex; align-items: flex-start; gap: 11px; padding: 9px 0;
  font-family: var(--font-ui); font-size: 14px; color: var(--text-body); line-height: 20px; }
.price-feat-row .ck { color: var(--accent-text); flex: none; margin-top: 1px; }

/* ---------- Blog ---------- */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
@media (max-width: 900px) { .post-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .post-grid { grid-template-columns: 1fr; } }
.post-card { display: flex; flex-direction: column; cursor: pointer; }
.post-thumb { aspect-ratio: 16 / 10; border-radius: var(--radius-md); overflow: hidden;
  border: 1px solid var(--border-default); position: relative; background: var(--ink-1000); }
.post-card h3 { font-family: var(--font-ui); font-weight: 500; font-size: 19px; line-height: 25px;
  letter-spacing: -0.01em; color: var(--text-strong); margin: 16px 0 8px;
  transition: color var(--dur-fast) var(--ease-standard); }
.post-card:hover h3 { color: var(--accent-text); }
.post-card p { font-family: var(--font-ui); font-size: 14px; line-height: 21px; color: var(--text-muted); margin: 0; }

/* feature row (product page) */
.feat-row { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.feat-row.flip .feat-text { order: 2; }
@media (max-width: 900px) {
  .feat-row { grid-template-columns: 1fr; gap: 28px; }
  .feat-row.flip .feat-text { order: 0; }
}