/* Fylgja landing page. Dependency-free: one stylesheet, no build step. */

:root {
  --paper: #f7f5f1;
  --paper-2: #efebe4;
  --ink: #16181a;
  --ink-2: #454a4f;
  --ink-3: #5f656c;
  --rule: #ddd8ce;
  --rule-2: #cbc4b7;
  --accent: #1d5c45;
  --accent-ink: #f4f9f6;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --wrap: 76rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #131513;
    --paper-2: #191c1a;
    --ink: #ecebe6;
    --ink-2: #b6b8b3;
    --ink-3: #8d918c;
    --rule: #2c302d;
    --rule-2: #3a3f3b;
    --accent: #7fc4a3;
    --accent-ink: #10130f;
  }
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 2rem;
}

.narrow { max-width: 47rem; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: .6rem 1rem;
  z-index: 10;
}
.skip:focus { left: 0; }

a { color: inherit; }

a:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Type ---------------------------------------------------------------- */

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.12;
  margin: 0;
}

h1 {
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  letter-spacing: -0.025em;
}

h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  margin-bottom: 1.4rem;
}

h3 { font-size: 1.125rem; margin-bottom: .5rem; }

p { margin: 0 0 1.1rem; }

.label {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 1.4rem;
}

.lede {
  font-size: clamp(1.05rem, 1.7vw, 1.28rem);
  color: var(--ink-2);
  max-width: 40rem;
  margin: 1.6rem 0 0;
}

.section-lede {
  max-width: 42rem;
  color: var(--ink-2);
  margin-bottom: 3.4rem;
}

.pull {
  font-family: var(--serif);
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  line-height: 1.25;
  color: var(--ink);
  border-top: 1px solid var(--rule);
  padding-top: 1.8rem;
  margin-top: 2.4rem;
}

/* Buttons -------------------------------------------------------------- */

.btn {
  display: inline-block;
  font-size: .9rem;
  font-weight: 500;
  letter-spacing: .01em;
  text-decoration: none;
  padding: .7rem 1.15rem;
  border-radius: 3px;
  border: 1px solid transparent;
  transition: background-color .15s ease, border-color .15s ease, color .15s ease;
}

.btn-solid {
  background: var(--accent);
  color: var(--accent-ink);
}
.btn-solid:hover { background: var(--ink); color: var(--paper); }

.btn-quiet {
  border-color: var(--rule-2);
  color: var(--ink-2);
}
.btn-quiet:hover { border-color: var(--ink-2); color: var(--ink); }

/* Header --------------------------------------------------------------- */

.site-head {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 5;
}

.head-row {
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 4.25rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--serif);
  font-size: 1.2rem;
  letter-spacing: .01em;
  text-decoration: none;
  margin-right: auto;
  white-space: nowrap;
}

/* The wordmark mark is the mouse-head emoji, rendered by the platform's own
   emoji font so it stays crisp at any size. */
.mark {
  display: inline-block;
  font-size: 1.5rem;
  line-height: 1;
  font-family: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", sans-serif;
  /* Emoji ink sits high in its box; nudge it onto the wordmark's optical centre. */
  transform: translateY(2px);
}

.site-nav { display: flex; gap: 1.6rem; }

.site-nav a {
  font-size: .88rem;
  color: var(--ink-2);
  text-decoration: none;
}
.site-nav a:hover { color: var(--ink); }

.head-cta { padding: .55rem 1rem; font-size: .85rem; }

/* Hero ----------------------------------------------------------------- */

.hero { padding: clamp(3.5rem, 9vw, 7rem) 0 0; }

.hero-note {
  color: var(--ink-3);
  font-size: .88rem;
  margin-top: 1.6rem;
  max-width: 34rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 2rem;
}

.flow {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0;
  margin: clamp(3.5rem, 8vw, 6rem) 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.flow li {
  padding: 1.1rem 1rem 1.4rem 0;
  border-right: 1px solid var(--rule);
}

.flow li + li { padding-left: 1rem; }
.flow li:last-child { border-right: 0; }

.flow-k {
  display: block;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.flow-d {
  display: block;
  font-size: .8rem;
  color: var(--ink-3);
  margin-top: .3rem;
}

/* Facts ---------------------------------------------------------------- */

.facts {
  margin-top: clamp(3.5rem, 7vw, 5.5rem);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--paper-2);
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.fact {
  padding: 2rem 1.6rem 2.2rem 0;
  border-right: 1px solid var(--rule);
}

.fact + .fact { padding-left: 1.6rem; }
.fact:last-child { border-right: 0; }

.fact-n {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 2.6vw, 2.05rem);
  line-height: 1;
  margin: 0 0 .7rem;
}

.fact-t {
  font-size: .84rem;
  line-height: 1.5;
  color: var(--ink-2);
  margin: 0;
}

/* Bands ---------------------------------------------------------------- */

.band { padding: clamp(4rem, 9vw, 7rem) 0; }
.band-alt { background: var(--paper-2); border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }

.band h2 { max-width: 30rem; }

/* Method --------------------------------------------------------------- */

.phase-grid {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule-2);
}

.phase {
  display: grid;
  grid-template-columns: 16rem 1fr;
  gap: 2rem 3rem;
  padding: 2.6rem 0;
  border-bottom: 1px solid var(--rule);
}

.phase-head .phase-n {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 .6rem;
}

.spec { margin: 0; }

.spec > div {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 1rem;
  padding: .55rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: .92rem;
}

.spec > div:first-child { border-top: 1px solid var(--rule); }

.spec dt {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-top: .2rem;
}

.spec dd { margin: 0; color: var(--ink-2); }

.mini {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1.6rem;
  font-size: .88rem;
  font-variant-numeric: tabular-nums;
}

.mini caption {
  text-align: left;
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding-bottom: .6rem;
}

.mini th, .mini td {
  text-align: left;
  padding: .5rem .6rem .5rem 0;
  border-bottom: 1px solid var(--rule);
}

.mini th {
  font-weight: 500;
  color: var(--ink-3);
  font-size: .74rem;
  font-family: var(--mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.row-strong td { font-weight: 600; color: var(--ink); }

.note-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
  margin-top: 3.5rem;
}

.note {
  border-top: 2px solid var(--accent);
  padding-top: 1.3rem;
}

.note p { color: var(--ink-2); font-size: .95rem; margin: 0; }

/* Platform ------------------------------------------------------------- */

.surface-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.6rem 3rem;
}

.surface-list li { border-top: 1px solid var(--rule-2); padding-top: 1.3rem; }
.surface-list p { color: var(--ink-2); font-size: .92rem; margin: 0; }

.trace {
  margin-top: 4rem;
  border: 1px solid var(--rule-2);
  border-radius: 4px;
  padding: 2.2rem 2.4rem;
  background: var(--paper);
}

.trace-q {
  font-family: var(--serif);
  font-size: 1.3rem;
  margin: 0 0 1.4rem;
}

.trace-list { margin: 0; }

.trace-list > div {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 1.5rem;
  padding: .8rem 0;
  border-top: 1px solid var(--rule);
  font-size: .92rem;
}

.trace-list dt {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent);
  padding-top: .2rem;
}

.trace-list dd { margin: 0; color: var(--ink-2); }

/* Status --------------------------------------------------------------- */

.status-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
  margin-top: 1rem;
}

.status { border-top: 1px solid var(--rule-2); padding-top: 1.3rem; }
.status p { color: var(--ink-2); font-size: .93rem; margin: 0; }

/* Closing -------------------------------------------------------------- */

.closing {
  padding: clamp(4rem, 9vw, 7rem) 0;
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
}

.closing p { color: var(--ink-2); max-width: 34rem; margin-bottom: 2rem; }

/* Footer --------------------------------------------------------------- */

.site-foot { padding: 3rem 0 2.5rem; }

.foot-row {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  justify-content: space-between;
  align-items: flex-start;
}

.foot-mark {
  font-family: var(--serif);
  font-size: 1.1rem;
  margin: 0 0 .4rem;
}

.foot-note {
  color: var(--ink-3);
  font-size: .84rem;
  max-width: 24rem;
  margin: 0;
}

.foot-links { display: flex; gap: 1.6rem; font-size: .88rem; }
.foot-links a { color: var(--ink-2); text-decoration: none; }
.foot-links a:hover { color: var(--ink); }

.foot-legal {
  margin-top: 2.5rem;
  border-top: 1px solid var(--rule);
  padding-top: 1.4rem;
}

.foot-legal p {
  font-family: var(--mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--ink-3);
  margin: 0;
}

/* Responsive ----------------------------------------------------------- */

@media (max-width: 60rem) {
  .site-nav { display: none; }
  .flow { grid-template-columns: repeat(3, 1fr); }
  .flow li:nth-child(3) { border-right: 0; }
  .flow li:nth-child(3n+1) { padding-left: 0; }
  .flow li:nth-child(n+4) { border-top: 1px solid var(--rule); }
  .facts-grid { grid-template-columns: repeat(2, 1fr); }
  .fact:nth-child(2) { border-right: 0; }
  .fact:nth-child(odd) { padding-left: 0; }
  .fact:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .surface-list { grid-template-columns: repeat(2, 1fr); }
  .status-grid { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 46rem) {
  body { font-size: 16px; }
  .wrap { padding: 0 1.25rem; }
  .flow { grid-template-columns: repeat(2, 1fr); }
  .flow li:nth-child(odd) { border-right: 1px solid var(--rule); padding-left: 0; }
  .flow li:nth-child(even) { border-right: 0; padding-left: 1rem; }
  .flow li:nth-child(n+3) { border-top: 1px solid var(--rule); }
  .facts-grid { grid-template-columns: 1fr; }
  .fact, .fact + .fact { border-right: 0; border-top: 1px solid var(--rule); padding-left: 0; }
  .fact:first-child { border-top: 0; }
  .phase { grid-template-columns: 1fr; gap: 1.4rem; }
  .spec > div { grid-template-columns: 1fr; gap: .2rem; }
  .trace-list > div { grid-template-columns: 1fr; gap: .3rem; }
  .note-grid { grid-template-columns: 1fr; }
  .surface-list { grid-template-columns: 1fr; }
  .trace { padding: 1.6rem 1.4rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}