/* ============================================================
   Casa Sótara (Casa en Río Frío) — Rogelio Salmona · APG Studio
   Estudio de caso — hoja de estilos
   ============================================================ */

:root {
  --cs-bg: #0d0d0c;
  --cs-bg-raised: #151512;
  --cs-bg-panel: #18180f;
  --cs-line: rgba(255, 255, 255, 0.10);
  --cs-line-soft: rgba(255, 255, 255, 0.06);
  --cs-text: #ece8e0;
  --cs-text-dim: #a8a49a;
  --cs-text-faint: #6f6c63;
  --cs-accent: #b8905c;
  /* piedra / stone gold — misma paleta que Fallingwater, para consistencia entre estudios de caso */
  --cs-accent-soft: rgba(184, 144, 92, 0.15);
  --cs-serif: 'Cormorant Garamond', Georgia, serif;
  --cs-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --cs-mono: 'JetBrains Mono', 'SFMono-Regular', monospace;
  --cs-radius: 2px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--cs-bg);
  color: var(--cs-text);
  font-family: var(--cs-sans);
  font-weight: 300;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

code {
  font-family: var(--cs-mono);
  font-size: 0.85em;
  background: var(--cs-bg-panel);
  padding: 0.1em 0.4em;
  border-radius: var(--cs-radius);
  color: var(--cs-accent);
}

/* ───────────────────── Topbar ───────────────────── */

.cs-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem clamp(1.25rem, 5vw, 3rem);
  background: rgba(13, 13, 12, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--cs-line-soft);
}

.cs-back {
  font-family: var(--cs-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--cs-text-dim);
  transition: color 0.2s ease;
}

.cs-back:hover {
  color: var(--cs-accent);
}

.cs-topbar-label {
  font-family: var(--cs-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-text-faint);
}

/* ───────────────────── Hero ───────────────────── */

.cs-hero {
  max-width: 780px;
  margin: 0 auto;
  padding: clamp(4rem, 10vw, 7rem) clamp(1.25rem, 5vw, 3rem) 3rem;
  text-align: center;
}

.cs-eyebrow {
  font-family: var(--cs-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cs-accent);
  margin: 0 0 1.25rem;
}

.cs-title {
  font-family: var(--cs-serif);
  font-weight: 400;
  font-size: clamp(2.75rem, 8vw, 5rem);
  line-height: 1.05;
  margin: 0 0 0.6rem;
  letter-spacing: 0.01em;
}

.cs-architect {
  font-family: var(--cs-serif);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--cs-text-dim);
  margin: 0 0 1.75rem;
}

.cs-hero-note {
  font-size: 0.98rem;
  font-weight: 300;
  color: var(--cs-text-dim);
  max-width: 560px;
  margin: 0 auto 2.5rem;
}

.cs-hero-ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.cs-scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--cs-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  padding: 0.85rem 1.6rem;
  border: 1px solid var(--cs-accent);
  border-radius: var(--cs-radius);
  color: var(--cs-bg);
  background: var(--cs-accent);
  transition: all 0.25s ease;
}

.cs-scroll-cue:hover {
  background: transparent;
  color: var(--cs-accent);
}

.cs-scroll-cue svg {
  transition: transform 0.25s ease;
}

.cs-scroll-cue:hover svg {
  transform: translateY(2px);
}

.cs-scroll-cue--ghost {
  background: transparent;
  color: var(--cs-text-dim);
  border-color: var(--cs-line);
}

.cs-scroll-cue--ghost:hover {
  color: var(--cs-text);
  border-color: var(--cs-text-dim);
}

/* ───────────────────── Visor 3D ───────────────────── */

.cs-viewer-section {
  padding: 1rem clamp(1.25rem, 5vw, 3rem) 4rem;
}

.cs-viewer-frame {
  max-width: 1200px;
  margin: 0 auto;
  border: 1px solid var(--cs-line);
  border-radius: var(--cs-radius);
  overflow: hidden;
  background: var(--cs-bg-raised);
}

.cs-canvas-host {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: #111110;
}

#csCanvas {
  display: block;
  width: 100%;
  height: 100%;
}

/* Loader */
.cs-loader {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  background: #111110;
}

.cs-loader-ring {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 2px solid var(--cs-line);
  border-top-color: var(--cs-accent);
  animation: cs-spin 0.9s linear infinite;
}

@keyframes cs-spin {
  to {
    transform: rotate(360deg);
  }
}

.cs-loader-text {
  font-family: var(--cs-mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--cs-text-dim);
  margin: 0;
}

/* Fallback */
.cs-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 2rem;
  text-align: center;
  background: #111110;
}

.cs-fallback[hidden] {
  display: none !important;
}

.cs-loader[hidden] {
  display: none !important;
}

.cs-fallback-svg {
  width: 72px;
  height: 60px;
  color: var(--cs-text-faint);
  margin-bottom: 0.5rem;
}

.cs-fallback-title {
  font-family: var(--cs-serif);
  font-size: 1.3rem;
  margin: 0;
  color: var(--cs-text);
}

.cs-fallback-text {
  font-size: 0.88rem;
  color: var(--cs-text-dim);
  max-width: 420px;
  margin: 0;
}

.cs-fallback-detail {
  margin: 0.75rem 0 0;
  padding: 0.75rem 1rem;
  max-width: 560px;
  max-height: 160px;
  overflow: auto;
  text-align: left;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: var(--cs-mono);
  font-size: 0.72rem;
  line-height: 1.5;
  color: #e3a1a1;
  background: rgba(200, 80, 80, 0.08);
  border: 1px solid rgba(200, 80, 80, 0.25);
  border-radius: var(--cs-radius);
}

/* Controls bar */
.cs-viewer-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--cs-line-soft);
  background: var(--cs-bg-raised);
}

.cs-vc-btn {
  font-family: var(--cs-mono);
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--cs-text-dim);
  background: transparent;
  border: 1px solid var(--cs-line);
  border-radius: var(--cs-radius);
  padding: 0.55rem 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.cs-vc-btn:hover {
  color: var(--cs-text);
  border-color: var(--cs-text-dim);
}

.cs-vc-btn.is-active {
  color: var(--cs-bg);
  background: var(--cs-accent);
  border-color: var(--cs-accent);
}

.cs-vc-hint {
  margin-left: auto;
  font-family: var(--cs-mono);
  font-size: 0.72rem;
  color: var(--cs-text-faint);
}

/* Panel de capas */
.cs-layers-panel {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.9rem 1.25rem 1.1rem;
  border-top: 1px solid var(--cs-line-soft);
  background: var(--cs-bg-raised);
}

.cs-layers-label {
  font-family: var(--cs-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cs-text-faint);
  margin-right: 0.25rem;
}

.cs-layer-btn {
  font-family: var(--cs-mono);
  font-size: 0.72rem;
  letter-spacing: 0.01em;
  color: var(--cs-text);
  background: transparent;
  border: 1px solid var(--cs-accent);
  border-radius: var(--cs-radius);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.cs-layer-btn.is-active {
  color: var(--cs-bg);
  background: var(--cs-accent);
}

.cs-layer-btn:not(.is-active) {
  color: var(--cs-text-faint);
  border-color: var(--cs-line);
  text-decoration: line-through;
  text-decoration-color: var(--cs-text-faint);
}

.cs-layer-btn:hover {
  border-color: var(--cs-text-dim);
}

.cs-layer-btn.is-unavailable {
  opacity: 0.35;
  cursor: not-allowed;
  text-decoration: none;
}

.cs-layer-btn.is-unavailable:hover {
  border-color: var(--cs-line);
}

/* ───────────────────── Info / Acordeón ───────────────────── */

.cs-info {
  padding: 1rem clamp(1.25rem, 5vw, 3rem) 6rem;
}

.cs-accordion {
  max-width: 820px;
  margin: 0 auto;
  border-top: 1px solid var(--cs-line);
}

.cs-acc-item {
  border-bottom: 1px solid var(--cs-line);
}

.cs-acc-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1.5rem 0.25rem;
  color: var(--cs-text);
  text-align: left;
}

.cs-acc-num {
  font-family: var(--cs-mono);
  font-size: 0.8rem;
  color: var(--cs-accent);
  flex-shrink: 0;
}

.cs-acc-heading {
  font-family: var(--cs-serif);
  font-size: 1.4rem;
  font-weight: 400;
  flex: 1;
}

.cs-acc-chevron {
  font-size: 1.3rem;
  color: var(--cs-text-faint);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}

.cs-acc-item.is-open .cs-acc-chevron {
  transform: rotate(90deg);
  color: var(--cs-accent);
}

.cs-acc-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
}

.cs-acc-item.is-open .cs-acc-panel {
  grid-template-rows: 1fr;
}

.cs-acc-panel-inner {
  overflow: hidden;
}

.cs-acc-item .cs-acc-panel-inner {
  padding: 0 0.25rem;
}

.cs-acc-panel-inner p {
  font-size: 0.98rem;
  font-weight: 300;
  color: var(--cs-text-dim);
  margin: 0 0 1.1rem 0;
  padding-bottom: 0.25rem;
}

.cs-acc-panel-inner p:last-child {
  margin-bottom: 1.75rem;
}

.cs-inline-link {
  color: var(--cs-accent);
  border-bottom: 1px solid rgba(184, 144, 92, 0.4);
  transition: border-color 0.2s ease;
}

.cs-inline-link:hover {
  border-color: var(--cs-accent);
}

/* Ficha técnica */
.cs-spec-list {
  margin: 0 0 1.75rem;
  padding-top: 0.25rem;
}

.cs-spec-row {
  display: flex;
  gap: 1.5rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--cs-line-soft);
}

.cs-spec-row:first-child {
  border-top: 1px solid var(--cs-line-soft);
}

.cs-spec-row dt {
  flex: 0 0 160px;
  font-family: var(--cs-mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--cs-text-faint);
}

.cs-spec-row dd {
  margin: 0;
  font-size: 0.95rem;
  color: var(--cs-text);
  font-weight: 300;
}

/* ───────────────────── Footer ───────────────────── */

.cs-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 2rem clamp(1.25rem, 5vw, 3rem);
  border-top: 1px solid var(--cs-line-soft);
  font-family: var(--cs-mono);
  font-size: 0.75rem;
  color: var(--cs-text-faint);
}

.cs-footer-link {
  color: var(--cs-text-dim);
  transition: color 0.2s ease;
}

.cs-footer-link:hover {
  color: var(--cs-accent);
}

/* ───────────────────── Responsive ───────────────────── */

@media (max-width: 640px) {
  .cs-spec-row {
    flex-direction: column;
    gap: 0.25rem;
  }

  .cs-spec-row dt {
    flex: none;
  }

  .cs-vc-hint {
    margin-left: 0;
    width: 100%;
  }

  .cs-layers-panel {
    gap: 0.4rem;
    padding: 0.8rem 1rem 1rem;
  }

  .cs-layer-btn {
    font-size: 0.66rem;
    padding: 0.35rem 0.6rem;
  }

  /* ─── Visor 3D: más alto y de borde a borde en móvil ───
     16/9 sobre un ancho de ~360-400px deja el visor muy bajito (~200px),
     dejando poco espacio para apreciar el modelo. En pantallas angostas
     se usa una proporción más cuadrada y se quita el margen lateral para
     aprovechar todo el ancho disponible. */
  .cs-viewer-section {
    padding: 0.5rem 0 3rem;
  }

  .cs-viewer-frame {
    border-left: none;
    border-right: none;
    border-radius: 0;
  }

  .cs-canvas-host {
    aspect-ratio: 4 / 5;
  }

  .cs-viewer-controls {
    padding: 0.85rem 1rem;
    gap: 0.5rem;
  }

  .cs-vc-btn {
    flex: 1 1 auto;
    text-align: center;
    padding: 0.6rem 0.5rem;
  }

  /* Hero: menos aire arriba/abajo y CTAs más compactos */
  .cs-hero {
    padding: clamp(2.5rem, 10vw, 4rem) 1.25rem 2rem;
  }

  .cs-hero-ctas {
    gap: 1rem;
  }
}