/* The Altius Stack (/stack/). Port of the Claude Design file
   "Altius Stack Landing Page.dc.html" and its StackDiagram component.
   Tokens come from assets/product/product.css; everything here is scoped to
   .page-stack. The design switches to one column below 900px. */

.page-stack .stack { --st-dark: #190501; --st-light: #F7F6FF; --st-orange: #FA5838; overflow-wrap: break-word; }
.page-stack .stack h1, .page-stack .stack h2 { text-wrap: balance; }

/* Mono labels never hyphenate or break mid-word (design: [data-mono]). */
.page-stack .st-perf__label, .page-stack .st-perf__row dt, .page-stack .st-tag,
.page-stack .sd__name, .page-stack .sd__chip, .page-stack .sd__settles {
  hyphens: none; -webkit-hyphens: none; overflow-wrap: normal; word-break: normal;
}

/* Keyboard focus ring on links, buttons, cards and hero diagram blocks (design: [data-hv]). */
.page-stack .st-used a:focus-visible, .page-stack .st-perf__link:focus-visible,
.page-stack .st-btn-light:focus-visible, .page-stack .st-card:focus-visible,
.page-stack .sd--hero .sd__block:focus-visible { outline: 2px solid #FA5838; outline-offset: 3px; }

/* ---- Sections ---- */
.page-stack .st-sec--dark { background: var(--st-dark); color: var(--st-light); --t70: rgba(247, 246, 255, 0.7); --rule: rgba(247, 246, 255, 0.18); --perf-rule: rgba(247, 246, 255, 0.16); }
.page-stack .st-sec--light { background: var(--st-light); color: var(--st-dark); --t70: rgba(25, 5, 1, 0.7); --rule: rgba(25, 5, 1, 0.14); --perf-rule: rgba(25, 5, 1, 0.16); }
/* Every section is one full screen with its content centred vertically
   (design: min-height 100svh, 40px vertical padding; 80px when narrow). */
.page-stack .st-sec { box-sizing: border-box; min-height: 100svh; display: flex; align-items: center; padding: 40px 0; }
.page-stack .st-sec[id] { scroll-margin-top: 0; }

.page-stack .st-grid {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
  padding: 0 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 40%;
  grid-template-areas: "head stack" "rest stack";
  grid-template-rows: auto 1fr;
  column-gap: 80px;
  row-gap: 32px;
}
.page-stack .st-head { grid-area: head; display: flex; flex-direction: column; gap: 24px; max-width: 600px; }
.page-stack .st-stack { grid-area: stack; align-self: center; display: flex; flex-direction: column; gap: 32px; }
.page-stack .st-rest { grid-area: rest; display: flex; flex-direction: column; gap: 32px; max-width: 600px; }

.page-stack .stack h2 { font-weight: 500; font-size: clamp(40px, 4.4vw, 56px); line-height: 1.04; letter-spacing: -0.02em; }
.page-stack .stack .st-lede { font-size: 20px; line-height: 1.45; text-wrap: pretty; }
.page-stack .stack .st-body { font-size: 18px; line-height: 1.55; color: var(--t70); text-wrap: pretty; }

/* Rules only between points: no top rule, none under the last one. */
.page-stack .stack .st-points { list-style: none; padding: 0; display: flex; flex-direction: column; }
.page-stack .st-points li { display: flex; flex-direction: column; gap: 8px; padding: 16px 0; border-bottom: 1px solid var(--rule); }
.page-stack .st-points li:first-child { padding-top: 0; }
.page-stack .st-points li:last-child { padding-bottom: 0; border-bottom: 0; }
.page-stack .stack .st-points h3 { font-weight: 400; font-size: 20px; line-height: 1.3; }
.page-stack .stack .st-points p { font-size: 16px; line-height: 1.55; color: var(--t70); }

.page-stack .stack .st-used { font-size: 16px; line-height: 1.55; color: var(--t70); }
.page-stack .st-used a { color: inherit; -webkit-text-fill-color: currentColor; text-decoration: none; }
.page-stack .st-sec--dark .st-used a { color: var(--st-light); }
.page-stack .st-sec--light .st-used a { color: var(--st-dark); }
@media (hover: hover) and (pointer: fine) {
  .page-stack .st-used a:hover { color: var(--st-orange); }
  .page-stack .st-used a:hover::after { content: " →"; }
}

/* Performance figures */
.page-stack .st-perf { display: flex; flex-direction: column; gap: 16px; }
.page-stack .st-perf__label { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; line-height: 1; text-transform: uppercase; color: var(--t70); }
.page-stack .st-perf__rule { height: 1px; background: var(--perf-rule); }
.page-stack .st-perf__row { display: grid; gap: 16px; margin: 0; }
.page-stack .st-perf__row--1 { grid-template-columns: minmax(0, 1fr); }
.page-stack .st-perf__row--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.page-stack .st-perf__row--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.page-stack .st-perf__row > div { display: flex; flex-direction: column-reverse; justify-content: flex-end; gap: 8px; min-width: 0; }
.page-stack .st-perf__row dd { margin: 0; font-family: var(--font-sans); font-size: 24px; font-weight: 500; line-height: 1.1; letter-spacing: -0.01em; }
.page-stack .st-perf__row dt { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; line-height: 1.35; text-transform: uppercase; color: var(--t70); font-weight: 400; }
.page-stack .st-perf__link { align-self: flex-start; font-size: 14px; line-height: 1.5; color: inherit; -webkit-text-fill-color: currentColor; text-decoration: none; }
@media (hover: hover) and (pointer: fine) { .page-stack .st-perf__link:hover { color: var(--st-orange); } }

/* ---- 01 Hero ---- */
.page-stack .stack .st-hero { padding: 68px 0 0; } /* the design reserves the 68px nav at the top */
.page-stack .st-hero__grid {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  box-sizing: border-box;
  padding: 32px 48px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  column-gap: clamp(48px, 6vw, 96px);
  row-gap: 56px;
  align-items: center;
}
.page-stack .st-hero__copy { display: flex; flex-direction: column; gap: 24px; max-width: 560px; }
.page-stack .stack .st-hero h1 { font-weight: 500; font-size: clamp(48px, 6vw, 76px); line-height: 1.02; letter-spacing: -0.03em; }
.page-stack .stack .st-hero__body { font-size: 20px; line-height: 1.55; color: rgba(247, 246, 255, 0.7); text-wrap: pretty; }
.page-stack .st-hero__cta { display: flex; padding-top: 8px; }
.page-stack .st-btn-light {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 26px; border-radius: var(--radius-sm);
  background: #F7F6FF; color: #190501; -webkit-text-fill-color: currentColor;
  font-size: 16px; font-weight: 500; line-height: 1; letter-spacing: -0.005em; text-decoration: none;
  transition: background 120ms var(--ease-standard);
}
@media (hover: hover) and (pointer: fine) { .page-stack .st-btn-light:hover { background: #E4E2F0; color: #190501; } }

/* ---- StackDiagram ----
   Columns 62/6/32: L1-side blocks left, a gutter, then offchain HPEC + the
   settlement connector. The highlighted block's row gets 3fr. */
.page-stack .sd {
  --txt: #F7F6FF; --grd: #190501; --t70: rgba(247, 246, 255, 0.7); --line: var(--t70); --gap: 10px;
  display: grid;
  grid-template-columns: 62fr 6fr 32fr;
  grid-template-rows: 0 1fr 1fr 1fr 1fr; /* row 1 is an empty spacer since the "Offchain" label was dropped */
  row-gap: var(--gap);
  margin-top: calc(-1 * var(--gap));
  width: 100%;
  min-height: 400px;
  box-sizing: border-box;
}
.page-stack .sd--light { --txt: #190501; --grd: #F7F6FF; --t70: rgba(25, 5, 1, 0.7); }
.page-stack .sd--hero { --line: var(--txt); --gap: 14px; grid-template-rows: 0 1fr 1fr 1fr 1.2fr; min-height: 460px; }
.page-stack .sd--lit-hpec { grid-template-rows: 0 3fr 1fr 1fr 1fr; }
.page-stack .sd--lit-ssmt { grid-template-rows: 0 1fr 3fr 1fr 1fr; }
.page-stack .sd--lit-cp { grid-template-rows: 0 1fr 1fr 3fr 1fr; }
.page-stack .sd--lit-l1 { grid-template-rows: 0 1fr 1fr 1fr 3fr; }

.page-stack .sd__block {
  display: flex; flex-direction: column; justify-content: center; gap: 12px;
  padding: 10px 12px; min-width: 0; box-sizing: border-box;
  background: transparent; border: 1px solid var(--line); border-radius: 8px;
  text-decoration: none; color: var(--t70); -webkit-text-fill-color: currentColor;
}
.page-stack .sd--hero .sd__block { gap: 8px; padding: 18px; color: var(--txt); cursor: pointer; }
.page-stack .sd__block--hpec { grid-column: 3; grid-row: 2; border-style: dashed; }
.page-stack .sd__block--ssmt { grid-column: 1; grid-row: 3; }
.page-stack .sd__block--cp { grid-column: 1; grid-row: 4; }
.page-stack .sd__block--l1 { grid-column: 1 / -1; grid-row: 5; background: var(--txt); border-color: var(--txt); color: var(--grd); }
.page-stack .sd__block.is-lit { justify-content: flex-start; background: var(--st-orange); border-color: var(--st-orange); color: #190501; }
.page-stack .sd__block--hpec.is-lit { border: 1px dashed #190501; }

.page-stack .sd__name {
  display: flex; flex-wrap: wrap; gap: 4px 8px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 400; letter-spacing: 0.08em; line-height: 1.3; text-transform: uppercase;
  transition: color 160ms var(--ease-standard);
}
.page-stack .sd--hero .sd__name { font-size: 13px; }
.page-stack .sd__block.is-lit .sd__name { font-weight: 500; }
.page-stack .sd__arrow { display: none; }
@media (hover: hover) and (pointer: fine) {
  .page-stack .sd--hero .sd__block:hover .sd__name { color: var(--st-orange); }
  .page-stack .sd--hero .sd__block:hover .sd__arrow { display: inline; }
}
.page-stack .sd__desc { font-family: var(--font-sans); font-size: 16px; line-height: 1.35; color: rgba(247, 246, 255, 0.7); text-wrap: pretty; }
.page-stack .sd__block--l1 .sd__desc { color: rgba(25, 5, 1, 0.7); }
.page-stack .sd__nowrap { white-space: nowrap; }
.page-stack .sd__chips { display: flex; flex-wrap: wrap; gap: 6px; }
.page-stack .sd__chip {
  padding: 5px 7px; border: 1px solid #190501; border-radius: 3px; max-width: 100%; box-sizing: border-box;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; line-height: 1.2; text-transform: uppercase; color: #190501;
}

/* Connector from HPEC down to L1 (rows 3-4 of the offchain column). */
.page-stack .sd__conn { grid-column: 3; grid-row: 3 / 5; margin: calc(-1 * var(--gap)) 0; display: flex; align-items: stretch; justify-content: center; gap: 12px; }
.page-stack .sd__line { width: 2px; flex: none; background: var(--t70); transform-origin: top; }
.page-stack .sd--hero .sd__conn { justify-content: flex-start; padding-left: 20px; }
.page-stack .sd--hero .sd__line { width: 3px; background: var(--st-orange); }
.page-stack .sd__settles { align-self: center; min-width: 0; font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.14em; line-height: 1.4; text-transform: uppercase; color: rgba(247, 246, 255, 0.7); }

/* Hero draw-in: blocks wipe up from L1 (staggered via --d), then the orange
   line grows and "Settles to L1" fades in. Armed by the inline script so the
   diagram is fully visible without JS or with reduced motion. */
@media (prefers-reduced-motion: no-preference) {
  .page-stack .sd.is-armed .sd__draw { clip-path: inset(100% 0 0 0); transition: clip-path 360ms linear var(--d, 0ms); }
  .page-stack .sd.is-armed .sd__line { transform: scaleY(0); transition: transform 560ms linear 1440ms; }
  .page-stack .sd.is-armed .sd__settles { opacity: 0; transition: opacity 200ms linear 1800ms; }
  .page-stack .sd.is-drawn .sd__draw { clip-path: inset(0 0 0 0); }
  .page-stack .sd.is-drawn .sd__line { transform: scaleY(1); }
  .page-stack .sd.is-drawn .sd__settles { opacity: 1; }
  html { scroll-behavior: smooth; }
}

/* ---- 06 Close ---- */
.page-stack .st-close__wrap {
  width: 100%; max-width: 1200px; margin: 0 auto; box-sizing: border-box;
  padding: 0 clamp(20px, 4vw, 48px);
  display: flex; flex-direction: column; gap: 48px;
}
.page-stack .st-close__head { display: flex; flex-direction: column; gap: 24px; max-width: 640px; }
.page-stack .stack .st-close h2 { text-wrap: balance; }
.page-stack .st-cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.page-stack .st-card {
  display: flex; flex-direction: column; gap: 32px; padding: 28px;
  border: 1px solid rgba(25, 5, 1, 0.2); border-radius: 12px;
  color: #190501; -webkit-text-fill-color: currentColor; text-decoration: none;
}
.page-stack .st-card__text { display: flex; flex-direction: column; gap: 8px; }
.page-stack .stack .st-card__title { font-weight: 400; font-size: 20px; line-height: 1.3; transition: color 160ms var(--ease-standard); }
.page-stack .st-card__arrow { display: none; }
@media (hover: hover) and (pointer: fine) {
  .page-stack .st-card:hover .st-card__title { color: var(--st-orange); }
  .page-stack .st-card:hover .st-card__arrow { display: inline; }
}
.page-stack .st-card__desc { font-size: 16px; line-height: 1.5; color: rgba(25, 5, 1, 0.7); }
.page-stack .st-card__tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.page-stack .st-tag {
  padding: 5px 7px; border: 1px solid rgba(25, 5, 1, 0.35); border-radius: 3px;
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; line-height: 1; text-transform: uppercase; color: #190501;
}

/* ---- Narrow (the design's <900px layout) ---- */
@media (max-width: 899px) {
  .page-stack .st-sec { padding: 80px 0; }
  .page-stack .stack .st-hero { padding: 148px 0 80px; }
  .page-stack .st-grid {
    padding: 0 20px;
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "head" "stack" "rest";
    grid-template-rows: auto auto auto;
    row-gap: 40px;
  }
  .page-stack .st-hero__grid { grid-template-columns: minmax(0, 1fr); padding: 0 20px; }
  .page-stack .st-cards { grid-template-columns: minmax(0, 1fr); }
  /* Tap targets (design: [data-tap]) */
  .page-stack .st-used a, .page-stack .st-perf__link { display: inline-block; padding: 10px 0; margin: 4px 0; }
  .page-stack .st-perf__link { padding: 12px 0; margin: -12px 0; }
  /* Non-hero diagram: highlighted row sizes to content, the others are 60px. */
  .page-stack .sd:not(.sd--hero) { min-height: 0; }
  .page-stack .sd--lit-hpec { grid-template-rows: 0 auto 60px 60px 60px; }
  .page-stack .sd--lit-ssmt { grid-template-rows: 0 60px auto 60px 60px; }
  .page-stack .sd--lit-cp { grid-template-rows: 0 60px 60px auto 60px; }
  .page-stack .sd--lit-l1 { grid-template-rows: 0 60px 60px 60px auto; }
  .page-stack .sd:not(.sd--hero) .sd__block.is-lit { padding: 16px 12px; }
}
@media (max-width: 520px) {
  .page-stack .sd { grid-template-columns: 56fr 4fr 40fr; }
  .page-stack .st-perf__label, .page-stack .st-perf__row dt, .page-stack .st-tag,
  .page-stack .sd__name, .page-stack .sd__chip, .page-stack .sd__settles { font-size: 10px !important; letter-spacing: 0.08em !important; }
}
@media (max-width: 479px) {
  .page-stack .st-perf__row--3 { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 359px) {
  .page-stack .st-perf__row--2 { grid-template-columns: minmax(0, 1fr); }
}