/* ============================================================
   THE JETTSET HOUSE — CULTURAL FLUENCY CHAPTER
   Standalone, isolated stylesheet.
   All selectors are scoped under .house-section and prefixed
   with "house-". No bare element selectors are used, so this
   file cannot leak into or be overridden by production styles.
   ============================================================ */

@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght@9..144,400;9..144,500;9..144,600&family=Inter:wght@400;500&family=IBM+Plex+Mono:wght@400;500&display=swap");

.house-section {
  /* ---- Design tokens (from JettSet Brand Operating System, Vol.04) ---- */
  --house-ink: #0A0908;          /* Jet Black — ground */
  --house-panel: #16140F;        /* Elevated Black — panels */
  --house-ivory: #F5F3EF;        /* Warm Ivory */
  --house-gold: #C9A24B;         /* JettSet Gold — punctuation only */
  --house-gold-muted: #8C763F;   /* Muted Gold — quiet rules */
  --house-grey: #8A8782;         /* Editorial Grey — supporting copy */

  --house-serif: "Fraunces", "Iowan Old Style", "Georgia", serif;
  --house-sans: "Inter", -apple-system, "Helvetica Neue", Arial, sans-serif;
  --house-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --house-unit: 8px; /* 8px base spacing logic */
  --house-edge: clamp(24px, 6vw, 96px);

  position: relative;
  background: var(--house-ink);
  color: var(--house-ivory);
  font-family: var(--house-sans);
  overflow: hidden;
  isolation: isolate;
}

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

/* ---------------------------------------------------------------
   OUTER GRID — 12-column editorial spread.
   Desktop default. Nothing here is centered: the headline column
   sits off-axis, the visual plate takes the wider right measure.
   --------------------------------------------------------------- */

.house-grid {
  position: relative;
  display: grid;
  grid-template-columns: var(--house-unit) repeat(11, 1fr);
  grid-template-rows: auto;
  min-height: 900px;
  padding: 0;
}

/* ---- Rotated kicker rail (far-left folio strip) ---- */

.house-rail {
  grid-column: 1 / 2;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-block: calc(var(--house-unit) * 6);
  border-right: 1px solid rgba(201, 162, 75, 0.16);
}

.house-rail-label {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--house-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--house-grey);
  white-space: nowrap;
}

.house-rail-label em {
  font-style: normal;
  color: var(--house-gold);
}

/* ---- Editorial text column (asymmetric, left-weighted, lower half) ---- */

.house-editorial {
  grid-column: 2 / 8;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: calc(var(--house-unit) * 9) calc(var(--house-unit) * 6) calc(var(--house-unit) * 10) var(--house-edge);
}

.house-kicker {
  font-family: var(--house-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--house-gold);
  margin: 0 0 calc(var(--house-unit) * 3);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.house-headline {
  font-family: var(--house-serif);
  font-weight: 500;
  font-size: clamp(32px, 3.6vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0 0 calc(var(--house-unit) * 4);
  max-width: 20ch;
}

.house-headline-line {
  display: block;
  overflow: hidden;
}

.house-headline-line span {
  display: block;
  opacity: 0;
  transform: translateY(58%);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
}

.house-headline-line:nth-child(2) span {
  color: var(--house-grey);
  transition-delay: 0.08s;
}

.house-body {
  font-family: var(--house-sans);
  font-size: 17px;
  line-height: 1.65;
  color: rgba(245, 243, 239, 0.78);
  max-width: 46ch;
  margin: 0 0 calc(var(--house-unit) * 3.5);
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.9s ease 0.22s, transform 0.9s ease 0.22s;
}

.house-line {
  font-family: var(--house-serif);
  font-style: italic;
  font-size: 18px;
  color: var(--house-ivory);
  border-top: 1px solid rgba(201, 162, 75, 0.3);
  padding-top: calc(var(--house-unit) * 2.5);
  margin: 0 0 calc(var(--house-unit) * 4);
  max-width: 40ch;
  opacity: 0;
  transition: opacity 1s ease 0.34s;
}

.house-editorial-line {
  font-family: var(--house-sans);
  font-size: 13px;
  line-height: 1.5;
  color: rgba(138, 135, 130, 0.85);
  max-width: 34ch;
  margin: 0 0 calc(var(--house-unit) * 4);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.9s ease 0.5s, transform 0.9s ease 0.5s;
}

.house-cta {
  display: inline-flex;
  align-items: center;
  gap: calc(var(--house-unit) * 1.25);
  align-self: flex-start;
  font-family: var(--house-sans);
  font-size: 13px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--house-ivory);
  text-decoration: none;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--house-gold-muted);
  transition: border-color 0.4s ease, color 0.4s ease, gap 0.4s ease;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.9s ease 0.42s, transform 0.9s ease 0.42s;
}

.house-cta:hover {
  color: var(--house-gold);
  border-color: var(--house-gold);
  gap: calc(var(--house-unit) * 2);
}

.house-cta-arrow {
  transition: transform 0.4s ease;
}

.house-cta:hover .house-cta-arrow {
  transform: translateX(3px);
}

/* ---- Reveal state, set by JS via IntersectionObserver ---- */

.house-section.is-visible .house-kicker,
.house-section.is-visible .house-headline-line span,
.house-section.is-visible .house-body,
.house-section.is-visible .house-line,
.house-section.is-visible .house-editorial-line,
.house-section.is-visible .house-cta {
  opacity: 1;
  transform: translateY(0);
}

/* Content is fully readable when JavaScript is unavailable. The script adds
   this opt-in class only when its reveal observer is ready. */
.house-section:not(.house-reveal-ready) .house-kicker,
.house-section:not(.house-reveal-ready) .house-headline-line span,
.house-section:not(.house-reveal-ready) .house-body,
.house-section:not(.house-reveal-ready) .house-line,
.house-section:not(.house-reveal-ready) .house-editorial-line,
.house-section:not(.house-reveal-ready) .house-cta {
  opacity: 1;
  transform: none;
}

/* ---------------------------------------------------------------
   VISUAL PLATE — final approved still (motion development stopped
   for this chapter; ships as a static plate).
   --------------------------------------------------------------- */

.house-plate {
  grid-column: 8 / 13;
  position: relative;
  background: radial-gradient(120% 140% at 78% 18%, #201c14 0%, #100f0b 46%, #0a0908 100%);
  overflow: hidden;
  border-left: 1px solid rgba(201, 162, 75, 0.16);
}

.house-plate-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.6s ease;
}

.house-plate-media.is-active {
  opacity: 1;
}

.house-plate-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 9, 8, 0) 55%, rgba(10, 9, 8, 0.55) 100%);
  pointer-events: none;
}

/* ---- Running index — a cartographic ledger, not a card grid ---- */

.house-index {
  position: absolute;
  top: calc(var(--house-unit) * 4);
  right: calc(var(--house-unit) * 3);
  width: 220px;
  text-align: right;
}

.house-index-label {
  font-family: var(--house-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(245, 243, 239, 0.45);
  margin: 0 0 calc(var(--house-unit) * 1.5);
}

.house-index-stage {
  position: relative;
  height: 24px;
  overflow: hidden;
}

.house-index-item {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  font-family: var(--house-serif);
  font-style: italic;
  font-size: 16px;
  color: var(--house-ivory);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.house-index-item.is-current {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Chapter-close hairline + attribution strip ---- */

.house-foot {
  grid-column: 2 / 13;
  height: 1px;
  margin: calc(var(--house-unit) * 2.5) 0;
  border-top: 1px solid rgba(201, 162, 75, 0.16);
}

/* ---------------------------------------------------------------
   MOBILE — 390 × 844 composition.
   Plate moves to the top as a fixed-ratio band; the rotated rail
   collapses into a single horizontal kicker; the running index
   becomes a slow horizontal ledger beneath the headline instead
   of cards or a marginal column.
   --------------------------------------------------------------- */

@media (max-width: 780px) {
  .house-grid {
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  .house-rail {
    display: none;
  }

  .house-plate {
    order: 1;
    height: 46vh;
    min-height: 300px;
  }

  .house-index {
    position: static;
    width: auto;
    text-align: left;
    padding: calc(var(--house-unit) * 2) var(--house-edge) 0;
    margin-top: calc(var(--house-unit) * -2);
  }

  .house-index-label {
    color: rgba(245, 243, 239, 0.5);
  }

  .house-index-stage {
    height: 22px;
  }

  .house-index-item {
    right: auto;
    left: 0;
    text-align: left;
    font-size: 15px;
  }

  .house-editorial {
    order: 2;
    padding: calc(var(--house-unit) * 4) var(--house-edge) calc(var(--house-unit) * 5);
  }

  .house-kicker::before {
    content: "";
  }

  .house-headline {
    font-size: clamp(32px, 9vw, 44px);
    max-width: 12ch;
  }

  .house-body {
    font-size: 16px;
    max-width: none;
  }

  .house-line {
    font-size: 16px;
  }

  .house-foot {
    order: 3;
    margin: calc(var(--house-unit) * 2) var(--house-edge);
  }
}

/* ---- Reduced motion: hold the honoured state, drop the choreography ---- */

@media (prefers-reduced-motion: reduce) {
  .house-section .house-kicker,
  .house-section .house-headline-line span,
  .house-section .house-body,
  .house-section .house-line,
  .house-section .house-editorial-line,
  .house-section .house-cta,
  .house-index-item {
    transition: none !important;
    animation: none !important;
    opacity: 1 !important;
    transform: none !important;
  }
}