/* ==========================================================================
   KÄLLA — ARQUITECTURA MODULAR DE AUTOR
   Editorial Brutalist & Nordic Timber Design System
   Zero rounded pills, zero gold gradients. Sharp architectural grid,
   warm birch/linen (#F4EFE6), charred timber (#121413), hearth amber (#D96B27).
   ========================================================================== */

:root {
  --charcoal-deep: #111312;
  --charcoal-panel: rgba(17, 19, 18, 0.82);
  --charcoal-solid: #161917;
  --pine-dark: #1d221f;

  --linen-light: #f4efe6;
  --linen-warm: #e8e0d2;
  --linen-muted: #b8b0a2;
  --stone-gray: #7e786d;

  --amber-hearth: #d96b27;
  --amber-soft: #e88d52;
  --forest-ok: #4d7c5b;
  --crimson-err: #c94a38;

  --line-subtle: rgba(244, 239, 230, 0.15);
  --line-strong: rgba(244, 239, 230, 0.35);
  --line-dark: rgba(17, 19, 18, 0.14);

  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --ease-arch: cubic-bezier(0.19, 1, 0.22, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--charcoal-deep);
  color: var(--linen-light);
  line-height: 1.55;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   FULL-WIDTH SCROLL VIDEO CANVAS (FIXED BACKGROUND)
   ========================================================================== */
#canvas-container {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  pointer-events: none;
  overflow: hidden;
}

#scroll-canvas {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
}

/* Subtle atmospheric gradient that leaves the video clear */
.architectural-vignette {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(14, 16, 15, 0.45) 0%, rgba(14, 16, 15, 0.05) 45%, rgba(14, 16, 15, 0.05) 65%, rgba(14, 16, 15, 0.4) 100%),
    linear-gradient(180deg, rgba(14, 16, 15, 0.35) 0%, rgba(14, 16, 15, 0.04) 35%, rgba(14, 16, 15, 0.06) 70%, rgba(14, 16, 15, 0.5) 100%);
}

/* Exposed Architectural Grid Hairlines on Viewport */
.viewport-grid-lines {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  display: grid;
  grid-template-columns: 64px 1fr 1fr 64px;
}

.viewport-grid-lines span {
  border-right: 1px solid rgba(244, 239, 230, 0.06);
  height: 100%;
}

@media (max-width: 900px) {
  .viewport-grid-lines {
    display: none;
  }
}

/* Preloader Line */
#frame-preloader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 9999;
  background: rgba(244, 239, 230, 0.08);
}

#frame-progress-bar {
  width: 0%;
  height: 100%;
  background: var(--amber-hearth);
  transition: width 0.15s linear, opacity 0.4s ease;
}

/* ==========================================================================
   ARCHITECTURAL TOP BAR (STRUCTURAL GRID HEADER)
   ========================================================================== */
.arch-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(17, 19, 18, 0.78);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-subtle);
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: stretch;
  height: 64px;
}

.arch-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 0 28px;
  border-right: 1px solid var(--line-subtle);
  text-decoration: none;
  color: var(--linen-light);
}

.arch-brand-mark {
  font-family: var(--font-serif);
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: 4px;
  text-transform: uppercase;
}

.arch-brand-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--linen-muted);
  letter-spacing: 1px;
  text-transform: uppercase;
  border-left: 1px solid var(--line-subtle);
  padding-left: 12px;
}

.arch-nav {
  display: flex;
  align-items: center;
  padding: 0 28px;
  gap: 32px;
  list-style: none;
}

.arch-nav a {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--linen-muted);
  text-decoration: none;
  transition: color 0.25s ease;
}

.arch-nav a:hover {
  color: var(--linen-light);
}

.arch-telemetry {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  border-left: 1px solid var(--line-subtle);
  border-right: 1px solid var(--line-subtle);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--linen-muted);
}

.telemetry-dot {
  width: 6px;
  height: 6px;
  background: var(--amber-hearth);
  display: inline-block;
}

.arch-header-cta {
  display: flex;
  align-items: center;
  padding: 0 28px;
  background: var(--linen-light);
  color: var(--charcoal-deep);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease;
}

.arch-header-cta:hover {
  background: var(--amber-hearth);
  color: #fff;
}

.mobile-toggle {
  display: none;
  background: transparent;
  border: none;
  border-left: 1px solid var(--line-subtle);
  color: var(--linen-light);
  padding: 0 22px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
}

@media (max-width: 1080px) {
  .arch-telemetry {
    display: none;
  }
}

@media (max-width: 860px) {
  .arch-header {
    grid-template-columns: 1fr auto;
  }
  .arch-brand-tag, .arch-header-cta {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .arch-nav {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: var(--charcoal-solid);
    flex-direction: column;
    align-items: flex-start;
    padding: 24px 28px;
    gap: 18px;
    border-bottom: 1px solid var(--line-strong);
    display: none;
  }
  .arch-nav.open {
    display: flex;
  }
}

/* ==========================================================================
   BUTTONS & CONTROLS (SHARP ARCHITECTURAL RECTANGLES)
   ========================================================================== */
.btn-arch {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 26px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.3s var(--ease-arch);
}

.btn-arch-light {
  background: var(--linen-light);
  color: var(--charcoal-deep);
}

.btn-arch-light:hover {
  background: var(--amber-hearth);
  color: #ffffff;
}

.btn-arch-amber {
  background: var(--amber-hearth);
  color: #ffffff;
}

.btn-arch-amber:hover {
  background: #bf591b;
}

.btn-arch-whatsapp {
  background: #25D366;
  color: #ffffff;
  font-weight: 600;
}

.btn-arch-whatsapp:hover {
  background: #1da851;
  color: #ffffff;
}

.btn-arch-ghost {
  background: rgba(17, 19, 18, 0.6);
  color: var(--linen-light);
  border-color: var(--line-strong);
}

.btn-arch-ghost:hover {
  background: var(--linen-light);
  color: var(--charcoal-deep);
}

.btn-arch-dark {
  background: var(--charcoal-deep);
  color: var(--linen-light);
}

.btn-arch-dark:hover {
  background: var(--amber-hearth);
  color: #fff;
}

/* ==========================================================================
   ACTO I: RECORRIDO INMERSIVO POR SCROLL (SYNCED WITH VIDEO FRAMES)
   Each stage leaves the center of the screen open so the video shines.
   ========================================================================== */
.spatial-journey {
  position: relative;
  z-index: 20;
}

.stage-screen {
  min-height: 100vh;
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 110px 64px 64px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

@media (max-width: 900px) {
  .stage-screen {
    padding: 96px 24px 48px;
  }
}

/* Stage 1: Exterior Pine Forest (Frames 001 - 030) */
.stage-hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 40px;
  border-bottom: 1px solid var(--line-subtle);
  padding-bottom: 24px;
}

.mono-index {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--amber-soft);
  display: block;
  margin-bottom: 10px;
}

.editorial-display {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.8rem, 6vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -1px;
  max-width: 780px;
  color: var(--linen-light);
}

.editorial-display em {
  font-style: italic;
  color: var(--linen-warm);
  font-weight: 300;
}

.stage-hero-bottom {
  display: grid;
  grid-template-columns: 440px 1fr;
  align-items: end;
  gap: 48px;
  margin-top: auto;
  padding-top: 40px;
}

@media (max-width: 960px) {
  .stage-hero-bottom {
    grid-template-columns: 1fr;
  }
}

.editorial-manifesto-box {
  background: var(--charcoal-panel);
  backdrop-filter: blur(14px);
  border-left: 2px solid var(--amber-hearth);
  padding: 28px 30px;
}

.editorial-manifesto-box p {
  font-size: 1.02rem;
  color: var(--linen-warm);
  margin-bottom: 24px;
  line-height: 1.65;
}

.hero-metrics-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line-subtle);
  background: rgba(17, 19, 18, 0.72);
  backdrop-filter: blur(10px);
}

.metric-cell {
  padding: 20px 24px;
  border-right: 1px solid var(--line-subtle);
}

.metric-cell:last-child {
  border-right: none;
}

.metric-cell .num {
  font-family: var(--font-serif);
  font-size: 2.3rem;
  line-height: 1;
  color: var(--linen-light);
  display: block;
  margin-bottom: 6px;
}

.metric-cell .lbl {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--linen-muted);
}

@media (max-width: 640px) {
  .hero-metrics-strip {
    grid-template-columns: 1fr;
  }
  .metric-cell {
    border-right: none;
    border-bottom: 1px solid var(--line-subtle);
  }
}

/* Stage 2: Approach to Timber Deck & Glass Facade (Frames 031 - 060) */
.stage-facade-layout {
  margin-top: auto;
  display: grid;
  grid-template-columns: 380px 1fr 340px;
  gap: 32px;
  align-items: end;
}

@media (max-width: 1024px) {
  .stage-facade-layout {
    grid-template-columns: 1fr;
  }
}

.arch-callout-panel {
  background: var(--charcoal-panel);
  backdrop-filter: blur(16px);
  border: 1px solid var(--line-subtle);
  padding: 32px;
}

.arch-callout-panel h2 {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 16px;
}

.arch-callout-panel p {
  font-size: 0.95rem;
  color: var(--linen-muted);
  line-height: 1.65;
}

.spec-annotations {
  background: rgba(17, 19, 18, 0.8);
  border: 1px solid var(--line-subtle);
  padding: 24px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.spec-annotations li {
  list-style: none;
  padding: 10px 0;
  border-bottom: 1px solid var(--line-subtle);
  display: flex;
  justify-content: space-between;
}

.spec-annotations li:last-child {
  border-bottom: none;
}

.spec-annotations .k {
  color: var(--linen-muted);
}

.spec-annotations .v {
  color: var(--linen-light);
}

/* Stage 3: Inside the Birch Room & Central Fireplace (Frames 061 - 095) */
/* Leaves the middle open specifically for the centered fireplace in frame 0085! */
.stage-interior-split {
  my: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  min-height: 75vh;
}

@media (max-width: 960px) {
  .stage-interior-split {
    flex-direction: column;
    justify-content: flex-end;
  }
}

.interior-wing {
  width: 340px;
  background: rgba(17, 19, 18, 0.82);
  backdrop-filter: blur(14px);
  border-top: 2px solid var(--linen-light);
  padding: 30px;
}

@media (max-width: 960px) {
  .interior-wing {
    width: 100%;
  }
}

.interior-wing h3 {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 400;
  margin-bottom: 12px;
}

.interior-wing p {
  font-size: 0.92rem;
  color: var(--linen-muted);
  line-height: 1.6;
}

/* Stage 4: Cantilever Deck & Perimeter Lighting (Frames 096 - 120) */
.stage-culmination-bar {
  margin-top: auto;
  background: var(--charcoal-panel);
  backdrop-filter: blur(18px);
  border: 1px solid var(--line-strong);
  padding: 40px 48px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.stage-culmination-bar h2 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 400;
  line-height: 1.08;
  max-width: 640px;
}

/* ==========================================================================
   ACTO II: PLANIMETRÍA & TIPOLOGÍAS (EDITORIAL WARM LINEN PAPER SECTION)
   High-contrast architectural dossier look (#F4EFE6)
   ========================================================================== */
.editorial-paper-section {
  position: relative;
  z-index: 30;
  background-color: var(--linen-light);
  color: var(--charcoal-deep);
  padding: 120px 64px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

@media (max-width: 900px) {
  .editorial-paper-section {
    padding: 80px 24px;
  }
}

.paper-container {
  max-width: 1320px;
  margin: 0 auto;
}

.editorial-section-head {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid var(--line-dark);
  margin-bottom: 56px;
}

@media (max-width: 860px) {
  .editorial-section-head {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

.editorial-kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--amber-hearth);
}

.editorial-heading {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 4.5vw, 4rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.5px;
}

/* Interactive Blueprint Selector */
.blueprint-selector-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--charcoal-deep);
  margin-bottom: 48px;
}

@media (max-width: 768px) {
  .blueprint-selector-bar {
    grid-template-columns: 1fr;
  }
}

.blueprint-tab {
  background: transparent;
  border: none;
  border-right: 1px solid var(--charcoal-deep);
  padding: 24px 28px;
  text-align: left;
  cursor: pointer;
  transition: all 0.25s ease;
  color: var(--charcoal-deep);
}

.blueprint-tab:last-child {
  border-right: none;
}

.blueprint-tab .code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
  opacity: 0.65;
}

.blueprint-tab .title {
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.blueprint-tab .area {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
}

.blueprint-tab.active {
  background: var(--charcoal-deep);
  color: var(--linen-light);
}

.blueprint-tab.active .code {
  color: var(--amber-soft);
  opacity: 1;
}

/* Blueprint Display Stage */
.blueprint-showcase {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  border: 1px solid var(--charcoal-deep);
  background: var(--linen-warm);
}

@media (max-width: 992px) {
  .blueprint-showcase {
    grid-template-columns: 1fr;
  }
}

.blueprint-drawing-canvas {
  padding: 48px;
  background: #151817;
  color: var(--linen-light);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 440px;
  position: relative;
  background-image: 
    linear-gradient(rgba(244, 239, 230, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(244, 239, 230, 0.04) 1px, transparent 1px);
  background-size: 28px 28px;
}

.blueprint-meta-top {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--linen-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.blueprint-svg-wrap {
  margin: 32px 0;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.blueprint-svg-wrap svg {
  width: 100%;
  max-width: 560px;
  height: auto;
}

.blueprint-details-column {
  padding: 44px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.bp-model-title {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 500;
  line-height: 1.05;
  margin-bottom: 12px;
}

.bp-model-desc {
  font-size: 0.96rem;
  color: #3d3b37;
  margin-bottom: 28px;
  line-height: 1.6;
}

.bp-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 32px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.bp-table tr {
  border-bottom: 1px solid var(--line-dark);
}

.bp-table td {
  padding: 12px 0;
}

.bp-table td:first-child {
  color: #635e54;
  text-transform: uppercase;
}

.bp-table td:last-child {
  text-align: right;
  font-weight: 600;
  color: var(--charcoal-deep);
}

.bp-price-banner {
  border-top: 2px solid var(--charcoal-deep);
  padding-top: 20px;
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.bp-price-banner .lbl {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.bp-price-banner .val {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-weight: 600;
}

/* ==========================================================================
   ACTO III: MANIFIESTO COMPARATIVO & PROCESO DE PRECISIÓN
   Transparent section background so the video frames remain crisp and visible
   ========================================================================== */
.manifesto-contrast-section {
  position: relative;
  z-index: 30;
  padding: 120px 64px;
  background: transparent;
}

@media (max-width: 900px) {
  .manifesto-contrast-section {
    padding: 80px 24px;
  }
}

.contrast-matrix {
  max-width: 1320px;
  margin: 0 auto;
  border: 1px solid var(--line-strong);
  background: rgba(15, 17, 16, 0.52);
  backdrop-filter: blur(6px);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
  .contrast-matrix {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .contrast-matrix {
    grid-template-columns: 1fr;
  }
}

.matrix-column {
  padding: 40px 32px;
  border-right: 1px solid var(--line-subtle);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.matrix-column:last-child {
  border-right: none;
}

.matrix-step-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--amber-soft);
  letter-spacing: 2px;
  margin-bottom: 36px;
}

.matrix-big-stat {
  font-family: var(--font-serif);
  font-size: 3.4rem;
  font-weight: 400;
  line-height: 1;
  margin-bottom: 14px;
  color: var(--linen-light);
}

.matrix-title {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 14px;
  color: var(--linen-warm);
}

.matrix-desc {
  font-size: 0.9rem;
  color: var(--linen-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

.matrix-old-vs {
  padding-top: 16px;
  border-top: 1px solid var(--line-subtle);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: #9e6b62;
}

/* ==========================================================================
   ACTO IV: CONFIGURADOR EN FORMATO PLIEGO DE ESPECIFICACIONES (LEDGER)
   ========================================================================== */
.ledger-config-section {
  position: relative;
  z-index: 30;
  padding: 120px 64px;
  background: transparent;
  border-top: 1px solid var(--line-subtle);
}

@media (max-width: 900px) {
  .ledger-config-section {
    padding: 80px 24px;
  }
}

.ledger-grid {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  border: 1px solid var(--line-strong);
  background: rgba(15, 17, 16, 0.62);
  backdrop-filter: blur(8px);
}

@media (max-width: 992px) {
  .ledger-grid {
    grid-template-columns: 1fr;
  }
}

.ledger-inputs-side {
  padding: 48px;
  border-right: 1px solid var(--line-strong);
}

@media (max-width: 768px) {
  .ledger-inputs-side {
    padding: 28px 20px;
    border-right: none;
  }
}

.ledger-step-block {
  padding-bottom: 36px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--line-subtle);
}

.ledger-step-block:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.ledger-step-title {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--amber-soft);
  margin-bottom: 18px;
  display: flex;
  justify-content: space-between;
}

/* Architectural Selector Rows */
.ledger-choice-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

@media (max-width: 680px) {
  .ledger-choice-grid {
    grid-template-columns: 1fr;
  }
}

.ledger-radio-card {
  cursor: pointer;
}

.ledger-radio-card input {
  display: none;
}

.ledger-box {
  border: 1px solid var(--line-subtle);
  padding: 18px;
  transition: all 0.2s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.ledger-box .name {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  color: var(--linen-light);
  margin-bottom: 4px;
}

.ledger-box .meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--linen-muted);
}

.ledger-radio-card input:checked + .ledger-box {
  border-color: var(--amber-hearth);
  background: rgba(217, 107, 39, 0.1);
}

/* Equipment Toggle Rows */
.ledger-addons-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

@media (max-width: 680px) {
  .ledger-addons-list {
    grid-template-columns: 1fr;
  }
}

.ledger-check-item {
  border: 1px solid var(--line-subtle);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.ledger-check-item:hover {
  border-color: var(--line-strong);
}

.ledger-check-left {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
}

.ledger-check-item input {
  accent-color: var(--amber-hearth);
  width: 16px;
  height: 16px;
}

.ledger-check-price {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--linen-muted);
}

/* Ledger Receipt Column */
.ledger-receipt-side {
  padding: 48px 40px;
  background: var(--linen-light);
  color: var(--charcoal-deep);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.receipt-header {
  border-bottom: 2px solid var(--charcoal-deep);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.receipt-header .code {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: #5c564c;
}

.receipt-header h3 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  margin-top: 4px;
}

.receipt-lines {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin-bottom: 32px;
}

.receipt-line {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px dashed rgba(17, 19, 18, 0.2);
  padding-bottom: 10px;
}

.receipt-total-block {
  background: var(--charcoal-deep);
  color: var(--linen-light);
  padding: 24px;
  margin-bottom: 24px;
}

.receipt-total-block .lbl {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--amber-soft);
}

.receipt-total-block .amount {
  font-family: var(--font-serif);
  font-size: 2.6rem;
  line-height: 1.1;
  margin: 6px 0;
}

.receipt-total-block .timeline {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--linen-muted);
}

/* ==========================================================================
   ACTO V: RESERVA DE PROYECTO / FORMULARIO PRIVADO DE CONVERSIÓN
   STRICT COMPLIANCE WITH USER GLOBAL RULE 6:
   - Alert banner placed DIRECTLY ABOVE action buttons at the bottom of the form
   - NO auto-scrolling when validation errors occur
   ========================================================================== */
.commission-form-section {
  position: relative;
  z-index: 30;
  padding: 120px 64px;
  background: transparent;
  border-top: 1px solid var(--line-strong);
}

@media (max-width: 900px) {
  .commission-form-section {
    padding: 80px 24px;
  }
}

.commission-layout {
  max-width: 1320px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: start;
}

@media (max-width: 992px) {
  .commission-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

.commission-editorial-pitch {
  background: rgba(15, 17, 16, 0.52);
  backdrop-filter: blur(6px);
  padding: 36px;
  border: 1px solid var(--line-subtle);
}

.commission-editorial-pitch h2 {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 4vw, 3.6rem);
  font-weight: 400;
  line-height: 1.05;
  margin-bottom: 24px;
}

.commission-editorial-pitch p {
  color: var(--linen-muted);
  font-size: 1rem;
  line-height: 1.65;
  margin-bottom: 32px;
}

.commission-guarantees {
  border-top: 1px solid var(--line-subtle);
  padding-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--linen-warm);
}

.commission-form-box {
  border: 1px solid var(--line-strong);
  background: rgba(17, 19, 18, 0.68);
  backdrop-filter: blur(8px);
  padding: 48px;
}

@media (max-width: 640px) {
  .commission-form-box {
    padding: 28px 20px;
  }
}

.arch-form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
}

@media (max-width: 640px) {
  .arch-form-row {
    grid-template-columns: 1fr;
  }
}

.arch-field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.arch-field label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--linen-muted);
}

.arch-field label span {
  color: var(--amber-hearth);
}

.arch-input, .arch-select, .arch-textarea {
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-strong);
  padding: 12px 0;
  color: var(--linen-light);
  font-family: var(--font-sans);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s ease;
  border-radius: 0;
}

.arch-input:focus, .arch-select:focus, .arch-textarea:focus {
  border-bottom-color: var(--amber-hearth);
}

.arch-select option {
  background: var(--charcoal-solid);
  color: var(--linen-light);
}

.arch-textarea {
  min-height: 80px;
  resize: vertical;
}

/* ==========================================================================
   ALERT CONTAINER — DIRECTLY ABOVE FORM ACTION BUTTONS (USER RULE 6)
   ========================================================================== */
.form-alert-container {
  display: none;
  margin-top: 8px;
  margin-bottom: 20px;
}

.form-alert {
  padding: 18px 20px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.5;
  border-left: 3px solid transparent;
}

.form-alert.alert-error {
  background: rgba(201, 74, 56, 0.14);
  border-left-color: var(--crimson-err);
  color: #f5b5ac;
}

.form-alert.alert-success {
  background: rgba(77, 124, 91, 0.18);
  border-left-color: var(--forest-ok);
  color: #c2e5ca;
}

/* Footer */
.arch-footer {
  position: relative;
  z-index: 30;
  background: #0b0d0c;
  border-top: 1px solid var(--line-subtle);
  padding: 48px 64px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--linen-muted);
}

@media (max-width: 900px) {
  .arch-footer {
    padding: 36px 24px;
  }
}