/*
 * f-tree — site styles.
 *
 * The palette and the three typographic voices are lifted directly from the app
 * (ui/theme/Color.kt, ui/theme/Type.kt) so the site and the product read as the same
 * object. Brass keeps the single job it has in the app: marking what is not known.
 */

:root {
  color-scheme: light;

  --bone: #f7f6f1;
  --bone-raised: #fffffe;
  --bone-dim: #efeee7;
  --bone-sunk: #e9e8e1;

  --ink: #1a1c1a;
  --ink-soft: #414942;
  --ink-faint: #656d65;   /* 4.6:1 on the sunk band, the lowest-contrast ground it lands on */

  --forest: #2a5138;
  --forest-deep: #0c2417;
  --sage: #cde6d5;
  --sage-line: #5e8c6d;

  --brass: #8a6420;
  --brass-surface: #f7eedc;

  --rule: #c1c9c0;
  --rule-strong: #9aa69b;

  --serif: "Literata", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --gutter: clamp(20px, 5vw, 64px);
  --measure: 1220px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bone);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.65;
  font-variant-numeric: oldstyle-nums;
  -webkit-font-smoothing: antialiased;
}

.shell {
  max-width: var(--measure);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

a { color: var(--forest); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--forest);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------------------------------------------------------------- masthead */

.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--bone);
  position: sticky;
  top: 0;
  z-index: 20;
}
.masthead .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 62px;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.015em;
  color: var(--ink);
  text-decoration: none;
}
.wordmark svg { display: block; }

.masthead nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-family: var(--sans);
  font-size: 14px;
}
.masthead nav a {
  color: var(--ink-soft);
  text-decoration: none;
}
.masthead nav a:hover { color: var(--forest); text-decoration: underline; }
.masthead .nav-cta {
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--forest);
  padding: 8px 16px;
  border-radius: 999px;
  text-decoration: none;
}
.masthead .nav-cta:hover { background: var(--forest-deep); text-decoration: none; }
@media (max-width: 620px) {
  .masthead nav .nav-link { display: none; }
}

/* ------------------------------------------------------- register headings */
/*
 * The letterspaced mono label with a hairline running off to the right is the
 * section heading from the app's person screen. Reusing it here is the page's
 * main structural device.
 */

.rule-label {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 28px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.rule-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

/*
 * Where a section has no display heading of its own, the rule label is the heading and
 * is marked up as an h2. This must out-specify `.band h2`, which sets the display size.
 */
h2.rule-label,
.band h2.rule-label {
  font-size: 11px;
  line-height: 1.5;
  font-weight: 500;
  letter-spacing: 0.16em;
  margin: 0 0 28px;
}

/* -------------------------------------------------------------------- hero */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
  /* padding-block, not the `padding` shorthand: .hero sits on the same element as
     .shell, and the shorthand would reset .shell's padding-inline to zero. */
  padding-block: clamp(48px, 7vw, 92px) clamp(40px, 6vw, 76px);
}
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; }
}

.eyebrow {
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass);
}

.hero h1 {
  margin: 0 0 22px;
  font-size: clamp(34px, 4.3vw, 52px);
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.022em;
  text-wrap: balance;
}
.hero h1 em {
  font-style: normal;
  color: var(--brass);
}

.lede {
  margin: 0 0 32px;
  font-size: clamp(17px, 1.5vw, 19px);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 30em;
}

/* ------------------------------------------------------------------ button */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 500;
  line-height: 1;
  padding: 17px 27px;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .15s ease, border-color .15s ease, transform .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--forest); color: #fff; }
.btn-primary:hover { background: var(--forest-deep); }

.btn-quiet {
  background: transparent;
  color: var(--forest);
  border-color: var(--rule-strong);
}
.btn-quiet:hover { border-color: var(--forest); background: var(--bone-dim); }

.cta-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
}

/* Spec line + live download counter, both in the records voice. */
.spec {
  margin: 18px 0 0;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-faint);
  letter-spacing: 0.01em;
}
.spec span { white-space: nowrap; }
.spec .sep { color: var(--rule-strong); padding: 0 3px; }

.counter {
  margin: 26px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-faint);
  max-width: 34em;
}
.counter b {
  display: inline-block;
  margin-bottom: 2px;
  font-weight: 500;
  font-size: 33px;
  color: var(--forest);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.counter[data-state="loading"] b { color: var(--rule-strong); }

/* ------------------------------------------------------------- hero chart */

.chart-frame {
  background: var(--bone-raised);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 10px 10px 0;
  box-shadow: 0 1px 2px rgba(12, 36, 23, .04), 0 12px 32px -18px rgba(12, 36, 23, .22);
}
.chart-stage { position: relative; }
.chart-stage svg { display: block; width: 100%; height: auto; }

.chart-caption {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  margin: 0;
  padding: 12px 12px 14px;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink-faint);
}
.chart-caption .marker { color: var(--brass); flex: none; }
.chart-caption button {
  font: inherit;
  color: var(--forest);
  background: none;
  border: 0;
  padding: 0;
  margin-left: 6px;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* Chart node notation, matching the app's chart. */
.node-card { fill: var(--bone-raised); stroke: var(--rule-strong); stroke-width: 1.25; }
.node-name { font-family: var(--serif); font-size: 15px; font-weight: 600; fill: var(--ink); }
.node-years {
  font-family: var(--mono);
  font-size: 11.5px;
  fill: var(--ink-faint);
  font-variant-numeric: tabular-nums lining-nums;
}
.link-line { stroke: var(--sage-line); stroke-width: 1.5; fill: none; }

.node-unknown .node-card {
  fill: var(--brass-surface);
  stroke: var(--brass);
  stroke-dasharray: 7 5;
}
.node-unknown .node-name { fill: var(--brass); font-style: italic; }

/* The one interactive node. */
.node-slot { cursor: pointer; }
.node-slot:hover .node-card { stroke-width: 2; }
.node-slot:focus-visible { outline: none; }
.node-slot:focus-visible .node-card { stroke-width: 2.5; stroke-dasharray: none; }

.node-named .node-card { fill: var(--sage); stroke: var(--forest); stroke-dasharray: none; }
.node-named .node-name { fill: var(--forest-deep); font-style: normal; }

.name-input {
  position: absolute;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  color: var(--forest-deep);
  background: var(--bone-raised);
  border: 2px solid var(--forest);
  border-radius: 8px;
  padding: 0 8px;
}

/* --------------------------------------------------------------- sections */

.band { padding: clamp(52px, 7vw, 92px) 0; }
.band-sunk { background: var(--bone-dim); border-block: 1px solid var(--rule); }
.band-deep { background: var(--forest-deep); color: #dfe7e0; }

/* Note: h2.rule-label deliberately out-specifies this — see the rule above the hero. */
.band h2 {
  margin: 0 0 18px;
  font-size: clamp(27px, 3.4vw, 38px);
  line-height: 1.14;
  font-weight: 600;
  letter-spacing: -0.018em;
  text-wrap: balance;
}
.band p { margin: 0 0 18px; color: var(--ink-soft); max-width: 34em; }
.band-deep p { color: #b3c4b8; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: center;
}
@media (max-width: 860px) { .split { grid-template-columns: 1fr; } }

/* Feature entries, set as register rows rather than a card grid. */
.entries { display: grid; gap: 0; }
.entry {
  display: grid;
  grid-template-columns: 232px minmax(0, 1fr);
  gap: 28px;
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}
.entry:last-child { border-bottom: 1px solid var(--rule); }
.entry h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.entry p { margin: 0; color: var(--ink-soft); font-size: 16px; }
@media (max-width: 700px) {
  .entry { grid-template-columns: 1fr; gap: 8px; }
}

/* Negative-space list: what the app deliberately does not do. */
.nots { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; }
.nots li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px solid rgba(179, 196, 184, .22);
  font-family: var(--mono);
  font-size: 14px;
  color: #dfe7e0;
}
.nots li::before {
  content: "no";
  flex: none;
  color: var(--brass-surface);
  opacity: .8;
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.shot {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 18px;
  border: 1px solid var(--rule);
  background: var(--bone-raised);
}
.shot-narrow { max-width: 360px; }

.gallery {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 250px;
  gap: 22px;
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
.gallery figure { margin: 0; scroll-snap-align: start; }
.gallery figcaption {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.5;
  color: var(--ink-faint);
}

/* ------------------------------------------------------------ download slab */

.slab {
  background: var(--bone-raised);
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: clamp(26px, 4vw, 44px);
}
.facts {
  margin: 26px 0 0;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 13px;
}
.facts div {
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr);
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--rule);
}
.facts dt { color: var(--ink-faint); letter-spacing: .04em; }
.facts dd { margin: 0; color: var(--ink); overflow-wrap: anywhere; }
@media (max-width: 560px) {
  .facts div { grid-template-columns: 1fr; gap: 2px; }
}

/* ------------------------------------------------------------------ footer */

.footer {
  border-top: 1px solid var(--rule);
  padding: 40px 0 56px;
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink-faint);
}
.footer .shell {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 32px;
  align-items: center;
  justify-content: space-between;
}
.footer nav { display: flex; flex-wrap: wrap; gap: 22px; }
.footer a { color: var(--ink-soft); text-decoration: none; }
.footer a:hover { color: var(--forest); text-decoration: underline; }

/* ------------------------------------------------------------- thanks page */

.steps { list-style: none; counter-reset: step; margin: 0; padding: 0; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding: 0 0 30px 62px;
  border-left: 1px solid var(--rule);
  margin-left: 17px;
}
.steps > li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps > li::before {
  content: counter(step);
  position: absolute;
  left: -18px;
  top: -2px;
  width: 35px;
  height: 35px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--sage);
  color: var(--forest-deep);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 500;
}
.steps h3 {
  margin: 4px 0 8px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.steps p { margin: 0 0 10px; color: var(--ink-soft); max-width: 36em; }

.quote {
  margin: 12px 0 0;
  padding: 12px 16px;
  background: var(--bone-dim);
  border-left: 2px solid var(--rule-strong);
  border-radius: 0 6px 6px 0;
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.quote b { font-weight: 500; color: var(--ink); }

.notice {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  background: var(--brass-surface);
  border: 1px solid #e3c38c;
  border-radius: 12px;
  font-size: 15.5px;
  line-height: 1.55;
  color: #4a3810;
}
.notice strong { color: #2c1d00; }

.hash {
  font-family: var(--mono);
  font-size: 12.5px;
  overflow-wrap: anywhere;
  color: var(--ink);
}

.status-line {
  margin: 22px 0 0;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink-faint);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
}

/* The numbered rail costs too much of a phone's width at its desktop indent. */
@media (max-width: 620px) {
  .steps > li { padding-left: 46px; margin-left: 14px; }
  .steps > li::before { left: -15px; width: 29px; height: 29px; font-size: 12px; }
}