/* Landing page. Tokens come from core/tokens.css. */

/* The pane: a night window. Distant lights sit behind the glass; the fog
   canvas sits on it; type and controls sit on top, always legible. */
.pane {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100svh;
  overflow: hidden;
  background: linear-gradient(180deg, var(--outside), var(--glass) 92%);
}

/* The pane's lower edge: haze settling on the sill instead of a hard seam */
.pane::after {
  content: '';
  position: absolute;
  inset: auto 0 0;
  z-index: -1;
  height: 6rem;
  background: linear-gradient(180deg, transparent, var(--glass));
  pointer-events: none;
}

.fog {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-4) var(--gutter);
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font: 700 var(--step-1) / 1 var(--font-display);
  letter-spacing: -0.02em;
  text-decoration: none;
}

.mark-dot {
  width: 0.7em;
  height: 0.7em;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 0.22em var(--amber-glow);
}

.bar-links {
  display: flex;
  align-items: center;
  gap: var(--s-5);
  font-size: var(--step--1);
  font-weight: 500;
}

.bar-links a {
  text-decoration: none;
  color: var(--ink-soft);
  padding: var(--s-2) 0;
}

.bar-links a:hover {
  color: var(--ink);
}

.gh {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
}

.hero {
  align-self: center;
  padding: var(--s-7) var(--gutter) var(--s-8);
  max-width: 64rem;
}

.hero-title {
  font-size: var(--step-5);
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-display);
  max-width: 11ch;
  font-variation-settings: 'opsz' 96;
}

.hero-lede {
  margin: var(--s-5) 0 0;
  max-width: 44ch;
  font-size: var(--step-1);
  line-height: 1.45;
  color: var(--ink-soft);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin-top: var(--s-6);
}

.glass-count {
  position: absolute;
  right: var(--gutter);
  /* clears the widget dock that lives in the bottom-right corner */
  bottom: calc(var(--s-5) + 3.5rem);
  display: flex;
  align-items: center;
  gap: var(--s-2);
  margin: 0;
  max-width: 22rem;
  font-size: var(--step--1);
  color: var(--ink-soft);
  text-align: right;
}

.live-dot {
  flex: none;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--ink-faint);
  transition: background-color var(--dur) var(--ease-out);
}

.glass-count[data-state='live'] .live-dot {
  background: var(--live);
}

.hint {
  position: absolute;
  left: var(--gutter);
  bottom: var(--s-5);
  margin: 0;
  font-size: var(--step--1);
  color: var(--ink-faint);
  transition: opacity var(--dur-slow) var(--ease-out);
}

.pane[data-wiped] .hint {
  opacity: 0;
}

/* Sections */
main {
  padding: 0 var(--gutter);
}

section {
  max-width: 76rem;
  margin: 0 auto;
  padding: var(--s-9) 0 var(--s-8);
}

section + section {
  border-top: 1px solid var(--line);
}

.section-title {
  font-size: var(--step-4);
  font-weight: 700;
  line-height: 1.04;
  max-width: 16ch;
}

/* How: two products, deliberately offset rather than twin cards */
.how {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--s-6);
  row-gap: var(--s-7);
}

.how .section-title {
  grid-column: 1 / -1;
}

.product h3 {
  font-size: var(--step-3);
  font-weight: 650;
  margin-bottom: var(--s-3);
}

.product p {
  margin: 0;
  max-width: 52ch;
  color: var(--ink-soft);
}

.product-room {
  grid-column: 1 / span 6;
}

.product-widget {
  grid-column: 7 / span 6;
  margin-top: var(--s-8);
}

.facts {
  list-style: none;
  padding: 0;
  margin: var(--s-5) 0 var(--s-5);
  display: grid;
  gap: var(--s-2);
}

.facts li {
  display: flex;
  gap: var(--s-3);
  align-items: baseline;
}

/* Bullets are prints: a small clear spot in the frost */
.facts li::before {
  content: '';
  flex: none;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--ink-faint);
  box-shadow: 0 0 0 0.2rem var(--line);
  transform: translateY(-0.1em);
}

kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 0.05em 0.4em;
  border-radius: var(--r-sm);
  background: var(--glass-raised);
  box-shadow: inset 0 -1px 0 var(--line-strong), inset 0 0 0 1px var(--line);
  text-align: center;
  font-family: var(--font-ui);
  font-weight: 600;
}

.link-arrow {
  font-weight: 600;
  color: var(--amber-ink);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-1);
}

.link-arrow .icon {
  transition: transform var(--dur-fast) var(--ease-out);
}

.link-arrow:hover .icon {
  transform: translateX(3px);
}

.mechanism {
  grid-column: 1 / -1;
  margin: var(--s-6) 0 0;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: var(--s-7);
  align-items: center;
}

.mechanism svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

.mechanism text {
  font: 500 15px var(--font-ui);
  fill: var(--ink-soft);
}

.mech-relays circle {
  fill: var(--glass-raised);
  stroke: var(--ink-faint);
  stroke-width: 1.5;
}

.mech-intro {
  fill: none;
  stroke: var(--ink-faint);
  stroke-width: 1.5;
  stroke-dasharray: 3 7;
  stroke-linecap: round;
}

.mech-direct {
  fill: none;
  stroke: var(--ink);
  stroke-width: 3;
  stroke-linecap: round;
}

.mech-peer rect {
  fill: var(--glass-raised);
  stroke: var(--line-strong);
  stroke-width: 1.5;
}

.mech-peer text {
  fill: var(--ink);
  font-weight: 600;
}

.mechanism .mech-label {
  font-size: 14px;
  fill: var(--ink);
}

.mechanism .mech-label-soft {
  fill: var(--ink-faint);
}

.mechanism figcaption {
  color: var(--ink-soft);
  max-width: 46ch;
}

/* Embed builder */
.embed {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--s-7);
  align-items: start;
}

.embed-intro {
  position: sticky;
  top: var(--s-6);
}

.embed-intro p {
  color: var(--ink-soft);
  max-width: 42ch;
  margin: var(--s-5) 0 0;
}

.builder {
  display: grid;
  gap: var(--s-6);
}

.field {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.field legend {
  padding: 0;
  margin-bottom: var(--s-3);
  font-weight: 650;
  font-size: var(--step-1);
}

.field-note {
  margin-left: var(--s-2);
  font-weight: 400;
  font-size: var(--step--1);
  color: var(--ink-faint);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-2);
}

.chip {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: var(--glass-raised);
  box-shadow: inset 0 0 0 1px var(--line);
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
  transition:
    box-shadow var(--dur-fast) var(--ease-out),
    transform var(--dur-fast) var(--ease-out),
    opacity var(--dur-fast) var(--ease-out);
  opacity: 0.55;
}

.chip:hover {
  opacity: 0.9;
}

.chip[aria-pressed='true'] {
  opacity: 1;
  box-shadow: inset 0 0 0 2px var(--amber);
}

.chip:active {
  transform: scale(0.92);
}

.custom input {
  margin-top: var(--s-3);
  width: min(100%, 18rem);
  min-height: 44px;
  padding: 0 var(--s-4);
  border: 0;
  border-radius: var(--r-pill);
  background: var(--glass-deep);
  box-shadow: inset 0 0 0 1px var(--line-strong);
  color: var(--ink);
  font: inherit;
}

.custom input::placeholder {
  color: var(--ink-faint);
}

.custom input:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

/* Corner picker: the choice is the preview. Four radios sit at the corners
   of a small page. */
.corners {
  position: relative;
  aspect-ratio: 16 / 9;
  max-width: 26rem;
  border-radius: var(--r-md);
  background: var(--glass-deep);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}

.corners-caption {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-size: var(--step--1);
  color: var(--ink-faint);
  pointer-events: none;
}

.corners label {
  position: absolute;
  display: flex;
  align-items: center;
  gap: var(--s-2);
  padding: var(--s-2) var(--s-3);
  border-radius: var(--r-pill);
  font-size: var(--step--1);
  color: var(--ink-soft);
  cursor: pointer;
  transition:
    background-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.corners label:nth-of-type(1) {
  top: var(--s-2);
  left: var(--s-2);
}

.corners label:nth-of-type(2) {
  top: var(--s-2);
  right: var(--s-2);
}

.corners label:nth-of-type(3) {
  bottom: var(--s-2);
  left: var(--s-2);
}

.corners label:nth-of-type(4) {
  bottom: var(--s-2);
  right: var(--s-2);
}

.corners input {
  appearance: none;
  margin: 0;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 50%;
  box-shadow: inset 0 0 0 1.5px var(--ink-faint);
  transition: box-shadow var(--dur-fast) var(--ease-out);
}

.corners input:checked {
  box-shadow: inset 0 0 0 0.45rem var(--amber);
}

.corners label:has(input:checked) {
  background: var(--glass-raised);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.corners label:has(input:focus-visible) {
  outline: 2px solid var(--amber);
  outline-offset: 2px;
}

.corners input:focus-visible {
  outline: none;
}

.switch {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  cursor: pointer;
  color: var(--ink-soft);
}

.switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.switch-track {
  position: relative;
  flex: none;
  width: 2.75rem;
  height: 1.6rem;
  border-radius: var(--r-pill);
  background: var(--glass-deep);
  box-shadow: inset 0 0 0 1px var(--line-strong);
  transition: background-color var(--dur) var(--ease-out);
}

.switch-track::after {
  content: '';
  position: absolute;
  top: 0.2rem;
  left: 0.2rem;
  width: 1.2rem;
  height: 1.2rem;
  border-radius: 50%;
  background: var(--ink-soft);
  transition:
    transform var(--dur) var(--ease-out),
    background-color var(--dur) var(--ease-out);
}

.switch input:checked + .switch-track {
  background: var(--amber);
}

.switch input:checked + .switch-track::after {
  transform: translateX(1.15rem);
  background: var(--on-amber);
}

.switch input:focus-visible + .switch-track {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.output {
  display: grid;
  gap: var(--s-4);
  justify-items: start;
}

.snippet {
  width: 100%;
  margin: 0;
  padding: var(--s-5);
  border-radius: var(--r-md);
  background: var(--glass-deep);
  box-shadow: inset 0 0 0 1px var(--line);
  color: var(--ink);
  font-size: var(--step--1);
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

.snippet .attr {
  color: var(--ink-faint);
}

#copy[data-copied] {
  --_bg: var(--live);
}

/* Limits */
.limits-lede {
  max-width: 52ch;
  color: var(--ink-soft);
  margin: var(--s-5) 0 var(--s-7);
}

.limit-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
  gap: var(--s-6) var(--s-7);
  margin: 0;
}

.limit-list dt {
  font: 650 var(--step-1) / var(--leading-snug) var(--font-display);
  letter-spacing: -0.015em;
  margin-bottom: var(--s-2);
}

.limit-list dd {
  margin: 0;
  color: var(--ink-soft);
  max-width: 48ch;
}

.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--s-4);
  max-width: 76rem;
  margin: 0 auto;
  padding: var(--s-6) var(--gutter) var(--s-8);
  border-top: 1px solid var(--line);
  font-size: var(--step--1);
  color: var(--ink-faint);
}

.foot p {
  margin: 0;
}

@media (max-width: 860px) {
  .product-room,
  .product-widget {
    grid-column: 1 / -1;
    margin-top: 0;
  }

  .mechanism,
  .embed {
    grid-template-columns: minmax(0, 1fr);
  }

  .embed-intro {
    position: static;
  }
}

@media (max-width: 640px) {
  .bar-links a:not(.gh) {
    display: none;
  }

  .hero {
    align-self: end;
    padding-bottom: var(--s-6);
  }

  .glass-count {
    position: static;
    /* room for the widget dock fixed to the bottom corner */
    padding: 0 var(--gutter) calc(var(--s-6) + 3.5rem);
    text-align: left;
  }

  .hint {
    display: none;
  }

  section {
    padding: var(--s-8) 0 var(--s-7);
  }

  .mechanism text {
    font-size: 24px;
  }

  .mechanism .mech-label {
    display: none;
  }
}