/* Cyanotype: one white ink at three densities on blueprint blue. Source of the look:
   design/landing.dc.html (canvas) and docs/landing-brief.md (not in git). */

:root {
  --ground: #1a5e8a;
  --ground-deep: #144c70;
  --ink: #ffffff;
  --ink-2: rgba(255, 255, 255, 0.78);
  --ink-3: rgba(255, 255, 255, 0.4);
  --rule: rgba(255, 255, 255, 0.9);
  --hair: rgba(255, 255, 255, 0.28);
  --grid: rgba(255, 255, 255, 0.07);
  --mono: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, Menlo, monospace;
  --pad: 32px;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 24px;
  background-color: var(--ground);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--ink);
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink-2);
}

a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

h1,
h2,
h3,
p,
ol,
ul,
dl,
dd,
figure {
  margin: 0;
}

.sheet {
  max-width: 1200px;
  margin: 0 auto;
  border: 1px solid var(--rule);
}

.cap {
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.fig {
  font-variant-numeric: tabular-nums lining-nums;
}

.prose {
  color: var(--ink-2);
  max-width: 64ch;
}

.note {
  font-size: 13px;
  color: var(--ink-2);
}

/* Sheet header */

.sheet-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px var(--pad);
  border-bottom: 1px solid var(--rule);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand .cap {
  color: var(--ink);
}

.status {
  padding: 10px var(--pad);
  border-bottom: 1px solid var(--hair);
}

/* Hero */

.hero {
  padding: 72px var(--pad) 56px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.hero-top {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 24px 48px;
  align-items: end;
}

h1 {
  font-size: 64px;
  line-height: 1.05;
  font-weight: 300;
  letter-spacing: -0.01em;
}

.hero-side {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.actions {
  display: flex;
  gap: 24px;
  align-items: center;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  border: 2px solid var(--ink);
  text-decoration: none;
}

.button:hover {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.1);
}

.actions a {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.diptych {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule);
}

.diptych figure {
  padding: 20px 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.diptych figure + figure {
  border-left: 1px solid var(--rule);
}

.diptych figcaption {
  color: var(--ink);
}

.diptych svg {
  display: block;
  width: 100%;
  height: auto;
}

.diptych text {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  fill: var(--ink);
}

.diptych text.on-liquid {
  fill: var(--ground);
}

.diptych text.dim {
  fill: var(--ink-2);
}

/* The one moving thing: the junior level on the AFTER drawing drops once. Without
   JavaScript, or with reduced motion, the drawing is shown already fallen. */

.after .j-liquid,
.after .j-lead {
  transform-box: view-box;
  transition: transform 600ms linear;
}

.after .j-liquid {
  transform-origin: 0 330px;
}

.after .lost {
  transition: opacity 600ms linear;
}

.after .j-note {
  transition: opacity 300ms linear 600ms;
}

.motion .after:not(.run) .j-liquid {
  transform: scaleY(1.88);
}

.motion .after:not(.run) .j-lead {
  transform: translateY(-44px);
}

.motion .after:not(.run) .lost,
.motion .after:not(.run) .j-note {
  opacity: 0;
}

/* Sections */

.section {
  padding: 56px var(--pad);
  border-top: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 24px;
}

.section-head .cap {
  color: var(--ink);
  min-width: 96px;
}

h2 {
  font-size: 28px;
  line-height: 1.2;
  font-weight: 400;
}

h3 {
  font-size: 18px;
  line-height: 1.35;
  font-weight: 500;
}

.notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 32px;
}

.notes > div {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
}

.how {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 32px;
}

.steps {
  list-style: none;
  padding: 0;
  margin-left: 18px;
  border-left: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.steps li {
  display: flex;
  gap: 20px;
  margin-left: -19px;
}

.balloon {
  flex: none;
  width: 36px;
  height: 36px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  background: var(--ground);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.steps li > div {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

code {
  font-family: var(--mono);
  font-size: 0.95em;
  color: var(--ink);
}

.params {
  border: 1px solid var(--rule);
  align-self: start;
}

.params .cap {
  display: block;
  color: var(--ink);
  padding: 10px 16px;
  border-bottom: 1px solid var(--rule);
}

.param-list {
  padding: 4px 16px 8px;
  font-size: 14px;
}

.param-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0;
  border-bottom: 1px solid var(--hair);
}

.param-row:last-child {
  border-bottom: 0;
}

.params dt {
  color: var(--ink-2);
}

.measured {
  border-top: 1px solid var(--rule);
}

.m-row {
  display: grid;
  grid-template-columns: 3fr 9fr;
  gap: 8px 32px;
  padding: 20px 0;
  border-bottom: 1px solid var(--hair);
}

.m-row:last-child {
  border-bottom-color: var(--rule);
}

.measured dt {
  font-size: 36px;
  font-weight: 300;
  line-height: 1.1;
}

.limits {
  background: var(--ground-deep);
}

.limits ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 32px;
}

.limits li {
  display: flex;
  gap: 16px;
  padding: 14px 0;
  border-top: 1px solid var(--hair);
}

.limits li .cap {
  flex: none;
  padding-top: 4px;
}

.faq {
  max-width: 860px;
  border-top: 1px solid var(--rule);
}

.faq details {
  padding: 16px 0;
  border-bottom: 1px solid var(--hair);
}

.faq summary {
  font-size: 18px;
  cursor: pointer;
}

.faq details p {
  margin-top: 10px;
}

/* Title block */

.title-block {
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 4fr 5fr 3fr;
}

.tb-col {
  display: flex;
  flex-direction: column;
}

.title-block > div + div {
  border-left: 1px solid var(--rule);
}

.tb-name {
  padding: 20px var(--pad);
  display: flex;
  align-items: center;
  gap: 16px;
}

.tb-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tb-label span:first-child {
  font-size: 22px;
}

.tb-cell {
  padding: 10px 20px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 13px;
}

.tb-cell + .tb-cell {
  border-top: 1px solid var(--hair);
}

.break {
  word-break: break-all;
}

/* Narrow sheets */

@media (max-width: 900px) {
  :root {
    --pad: 20px;
  }

  h1 {
    font-size: 44px;
  }

  .hero-top,
  .how {
    grid-template-columns: 1fr;
  }

  .notes {
    grid-template-columns: 1fr;
  }

  .title-block {
    grid-template-columns: 1fr 1fr;
  }

  .tb-name {
    grid-column: 1 / -1;
    border-bottom: 1px solid var(--rule);
  }

  .title-block > div + div {
    border-left: 0;
  }

  .title-block > div:last-child {
    border-left: 1px solid var(--rule);
  }
}

@media (max-width: 640px) {
  body {
    padding: 12px;
  }

  :root {
    --pad: 16px;
  }

  .sheet-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .hero {
    padding-top: 40px;
    gap: 32px;
  }

  h1 {
    font-size: 34px;
  }

  .diptych {
    grid-template-columns: 1fr;
  }

  .diptych figure {
    padding: 16px 12px 12px;
  }

  /* The drawing shrinks to about half; its labels must not. */
  .diptych text {
    font-size: 17px;
    letter-spacing: 0;
  }

  .diptych figure + figure {
    border-left: 0;
    border-top: 1px solid var(--rule);
  }

  .section {
    padding: 40px var(--pad);
    gap: 24px;
  }

  .section-head {
    flex-direction: column;
    gap: 4px;
  }

  .m-row {
    grid-template-columns: 1fr;
  }

  .measured dt {
    font-size: 30px;
  }

  .limits ul {
    grid-template-columns: 1fr;
  }

  .title-block {
    grid-template-columns: 1fr;
  }

  .title-block > div:last-child {
    border-left: 0;
    border-top: 1px solid var(--rule);
  }
}

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