/* Platform, trust, FAQ and CTA — the chapters that carry copy and
   cards rather than a built mockup. Semantic inks and surfaces follow each
   chapter's light or dark treatment. Status colour is reserved for mockups.

   Two primitives shared with device.css live at the top: .landing-card
   (a resting panel with hover lift) and .landing-tile (the icon tile). */

/* ---------- Shared: card and icon tile ---------- */

.landing-card {
  position: relative;
  min-width: 0;
  padding: 1.75rem;
  background: var(--lp-panel);
  border: 1px solid var(--lp-line);
  border-radius: var(--lp-radius-lg);
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.landing-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--lp-harbour) 45%, var(--lp-line));
  box-shadow:
    0 24px 60px -28px rgb(0 0 0 / 80%),
    0 0 40px -8px color-mix(in srgb, var(--lp-harbour) 30%, transparent);
}

.landing-tile {
  display: grid;
  place-items: center;
  flex: none;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: var(--lp-radius-md);
  background: color-mix(in srgb, var(--lp-shoal) 22%, transparent);
  color: color-mix(in srgb, var(--lp-cyan) 60%, white);
  font-size: 1.1rem;
}

/* ---------- Platform: one visual lead and an open capability grid ---------- */

.landing-platform__heading {
  display: grid;
  gap: 1.5rem;
  margin-bottom: clamp(3rem, 5vw, 5rem);
}

.landing-platform__heading .landing__sub {
  margin: 0;
}

.landing-platform__grid {
  display: grid;
  column-gap: clamp(2rem, 5vw, 5rem);
}

.landing-platform__card {
  min-width: 0;
  display: grid;
  gap: 1.25rem;
  align-content: start;
  padding-block: 2.25rem;
  border-top: 1px solid var(--lp-line);
}

.landing-platform__card--wide {
  padding-top: 0;
  padding-bottom: clamp(3rem, 5vw, 5rem);
  border-top: 0;
}

.landing-platform__index {
  display: block;
  margin: 0 0 .75rem;
  color: var(--lp-accent);
  font-size: .875rem;
  font-weight: 600;
  line-height: 1.4;
}

.landing-platform__title {
  max-width: 22ch;
  margin: 0;
  color: var(--lp-ink-strong);
  font-size: clamp(1.5rem, 2.1vw, 1.875rem);
  font-weight: 600;
  letter-spacing: -.025em;
  line-height: 1.18;
  text-wrap: balance;
}

.landing-platform__body {
  max-width: 45ch;
  margin: 0;
  color: var(--lp-ink);
  font-size: 1.0625rem;
  line-height: 1.7;
  text-wrap: pretty;
}

.landing-platform__card--wide .landing-platform__body {
  margin-top: 1.25rem;
}

.landing-platform__figure {
  min-width: 0;
  margin: .75rem 0 0;
  padding-block: 1.5rem;
  align-self: center;
}

.landing-platform__chart {
  width: 100%;
  height: auto;
}

.landing-platform__gridline {
  stroke: var(--lp-line);
  stroke-width: 1;
}

.landing-platform__line {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.landing-platform__line--previous {
  stroke: var(--lp-faint);
  stroke-width: 2;
}

.landing-platform__line--current {
  stroke: var(--lp-accent);
  stroke-width: 3;
}

.landing-platform__legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem 1.25rem;
  margin-top: 1rem;
  color: var(--lp-mute);
  font-size: .8125rem;
}

.landing-platform__legend-item {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
}

.landing-platform__legend-item::before {
  content: "";
  width: 1.25rem;
  border-top: 2px solid var(--lp-accent);
  border-radius: 1px;
}

.landing-platform__legend-item--previous::before {
  border-top: 2px dashed var(--lp-faint);
}

/* Supporting examples are plain text, not controls or nested cards. */
.landing-platform__docs {
  display: grid;
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.landing-platform__doc {
  display: flex;
  align-items: center;
  gap: .75rem;
  color: var(--lp-ink);
  font-size: .875rem;
  line-height: 1.4;
}

.landing-platform__doc i {
  width: 1rem;
  color: var(--lp-accent);
  font-size: .8rem;
  text-align: center;
}

.landing-platform__path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .65rem;
  margin: 0;
}

.landing-platform__sep {
  color: var(--lp-faint);
  font-size: .7rem;
}

.landing-platform__chip {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  color: var(--lp-ink);
  font-size: .875rem;
  white-space: nowrap;
}

.landing-platform__chip i {
  color: var(--lp-accent);
  font-size: .7rem;
}

/* ---------- Trust: copy beside individual assurances ---------- */

.landing-trust__inner {
  display: grid;
  gap: 3rem;
}

.landing-trust__copy .landing__sub {
  max-width: 26rem;
}

.landing-trust__list {
  display: grid;
  column-gap: 2.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.landing-trust__item {
  min-width: 0;
  display: grid;
  align-content: start;
  gap: 1.25rem;
  padding-block: 2rem;
  border-top: 1px solid var(--lp-line);
}

.landing-trust__icon {
  flex: none;
  width: 2rem;
  color: var(--lp-accent);
  font-size: 1.5rem;
  text-align: left;
}

.landing-trust__title {
  margin: 0 0 .75rem;
  color: var(--lp-ink-strong);
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -.015em;
  line-height: 1.3;
}

.landing-trust__body {
  max-width: 52ch;
  margin: 0;
  color: var(--lp-ink);
  font-size: 1.0625rem;
  line-height: 1.65;
  text-wrap: pretty;
}

/* ---------- FAQ: native disclosures on a hairline list ---------- */

.landing-faq__inner {
  display: grid;
  gap: 3rem;
}

.landing-faq__items {
  min-width: 0;
  border-top: 2px solid var(--lp-ink-strong);
}

.landing-faq__item {
  border-bottom: 1px solid var(--lp-line);
}

.landing-faq__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.5rem 0;
  color: var(--lp-ink-strong);
  font-size: clamp(1.125rem, 1.5vw, 1.375rem);
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.35;
  list-style: none;
  cursor: pointer;
}

.landing-faq__item[open] .landing-faq__question {
  color: var(--lp-accent);
}

.landing-faq__question::-webkit-details-marker {
  display: none;
}

.landing-faq__toggle {
  display: grid;
  place-items: center;
  flex: none;
  width: 2rem;
  height: 2rem;
  color: var(--lp-accent);
  font-size: .875rem;
  transition: transform 240ms ease, color 180ms ease, border-color 180ms ease;
}

.landing-faq__question:hover .landing-faq__toggle {
  color: var(--lp-cyan);
  border-color: color-mix(in srgb, var(--lp-cyan) 50%, transparent);
}

.landing-faq__item[open] .landing-faq__toggle {
  transform: rotate(45deg);
  color: var(--lp-cyan);
  border-color: color-mix(in srgb, var(--lp-cyan) 50%, transparent);
}

.landing-faq__answer {
  max-width: 60ch;
  margin: 0;
  padding: 0 0 1.5rem;
  color: var(--lp-ink);
  font-size: 1.0625rem;
  line-height: 1.7;
  text-wrap: pretty;
}

/* ---------- Breakpoints ---------- */

@media (width >= 36rem) {
  .landing-card {
    padding: 2rem;
  }

  .landing-trust__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-faq__answer {
    padding-right: 3rem;
  }
}

@media (width >= 56rem) {
  .landing-platform__heading {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 4rem;
    align-items: end;
  }

  .landing-platform__heading .landing__sub {
    max-width: 40ch;
    padding-bottom: .25rem;
  }

  .landing-platform__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .landing-platform__card {
    padding-block: 2.5rem;
  }

  .landing-platform__card--wide {
    grid-column: 1 / -1;
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    column-gap: 4rem;
    padding-top: 0;
    padding-bottom: 4rem;
  }

  .landing-platform__card--wide .landing-platform__figure {
    margin: 0;
    padding: 0;
  }

  .landing-platform__card--wide .landing-platform__title {
    max-width: 20ch;
    font-size: clamp(1.875rem, 2.8vw, 2.5rem);
  }

  .landing-trust__inner {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.4fr);
    align-items: start;
    gap: 3.5rem;
  }

  .landing-faq__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.25fr);
    gap: 4rem;
  }
}

@media (width >= 75rem) {
  .landing-trust__inner {
    gap: 5rem;
  }
}

/* Security parks its lead beside the assurance grid on tall desktops.
   The sheet uses overflow: clip so it does not capture sticky positioning.
   Short viewports keep the heading in normal flow. */
@media (width >= 56rem) and (height >= 48rem) {
  .landing-trust__copy {
    position: sticky;
    top: 8rem;
  }
}