/* ==========================================================================
   LU PEÑA · ARQ. STUDIO — Arquitectura Tangible
   Dirección visual: minimalismo editorial, líneas finas, tipografía ligera.
   Paleta oficial: Hueso #F0EEE6 (fondo propuesto más claro #F8F6F0) · Carbón #221F1B · Terracota #C55A2A
   Tipografías: Archivo (encabezados) · Space Grotesk ligera (cuerpo/labels/badges) · Fraunces itálica (acentos editoriales)
   ========================================================================== */

:root {
  --cal: #F8F6F0; /* hueso aclarado — propuesta de fondo más luminosa que el #F0EEE6 original */
  --carbon: #221F1B;
  --terracota: #C55A2A;
  /* tintes permitidos por el manual */
  --barro-claro: #D9BFA8;
  --barro-oscuro: #7A3A1D;
  --piedra: #EDEAE2;
  --carbon-suave: #635C52; /* gris cálido suavizado — nunca negro puro */

  --font-display: 'Archivo', sans-serif;   /* encabezados */
  --font-word: 'Space Grotesk', sans-serif; /* cuerpo, labels, badges, contadores */
  --font-serif: 'Fraunces', serif;          /* itálica de acento editorial ("Tangible", "Hábitats"...) */
  --font-mono: var(--font-word); /* alias: todo lo antes "mono" ahora vive en Space Grotesk ligera */

  --pad: clamp(1.5rem, 8vw, 10rem); /* márgenes laterales amplios — aire editorial */
  --line-hair: 1px; /* grosor único de línea fina para todo el sitio */
}

/* Modo oscuro — inversión de neutros (terracota constante) */
html[data-theme="dark"] {
  --cal: #16130F;
  --carbon: #F5F2EC;
  --piedra: #221F1B;
  --carbon-suave: #B8B2A8;
  --barro-claro: #5A4636;
}
html { transition: none; }
html, body { background: var(--cal); }

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

html { scroll-behavior: smooth; }
html.lenis { height: auto; scroll-behavior: auto; }
.lenis.lenis-smooth { scroll-behavior: auto !important; }

body {
  background: var(--cal);
  color: var(--carbon);
  font-family: var(--font-word);
  font-weight: 300;
  font-size: clamp(0.98rem, 1vw, 1.05rem); /* ≈16px — editorial, sin excesos */
  line-height: 1.85;
  transition: background 0.5s ease, color 0.5s ease;
  overflow-x: clip; /* clip (no 'hidden') para no romper position:sticky de los pilares */
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--terracota); color: var(--cal); }

h1, h2, h3 { font-family: var(--font-display); font-weight: 500; letter-spacing: -0.01em; }
a { color: inherit; text-decoration: none; }
.mono {
  font-family: var(--font-display); font-weight: 500;
  letter-spacing: 0.12em; font-size: 0.72rem; text-transform: uppercase;
}

em { font-style: normal; color: var(--terracota); font-weight: 500; }

/* Itálica editorial de acento — SOLO en grandes titulares (Fraunces) */
.hero__title .accent,
.essence__statement em,
.contact__title em,
.interlude__quote em,
.serif-accent {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 500;
  color: var(--terracota);
}

/* ---- Grano material global ---- */
.grain {
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 300 300' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---- Etiquetas de sección — números "01 —" diminutos, ligeros ---- */
.section-label {
  color: var(--terracota);
  margin-bottom: clamp(1.5rem, 3vw, 3rem);
  display: block;
  font-weight: 500;
  font-size: 0.66rem;
  letter-spacing: 0.14em; /* tracking reducido, uniforme en todas las secciones */
}

/* Etiquetas de sección sobre fondos oscuros (01·Proyectos, 02·360°, 03·Animación,
   05·Esencia) — en tono claro para que contrasten con el fondo, ligeras y sin caja */

/* Micro-badges diminutos y sutiles sobre imagen (thumbnails sin velo propio) */
.pcard__cap .mono,
.anim-card__cap .mono,
.pano-card__cap .mono,
.pano-modal__head .mono {
  display: inline-block; width: auto;
  background: color-mix(in srgb, var(--terracota) 88%, transparent); color: var(--cal) !important;
  padding: 0.28em 0.6em; border-radius: 999px;
  font-weight: 400; font-size: 0.6rem; letter-spacing: 0.12em;
  text-shadow: none !important;
}
.project-feature__cap .mono,
.architect__data .mono, .contact__grid .mono,
.lightbox__nextproj .mono { font-weight: 400; }

/* ==========================================================================
   NAV — translúcida con blur (efecto Pattersons)
   ========================================================================== */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 1rem var(--pad);
  background: color-mix(in srgb, var(--cal) 72%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid color-mix(in srgb, var(--carbon) 8%, transparent);
  transition: transform 0.45s cubic-bezier(0.6,0,0.2,1), background 0.4s;
}
.nav.nav--hidden { transform: translateY(-100%); }
.nav.nav--dark {
  background: color-mix(in srgb, var(--carbon) 72%, transparent);
  color: var(--cal);
  border-bottom-color: color-mix(in srgb, var(--cal) 10%, transparent);
}

.nav__brand { display: flex; align-items: center; gap: 0.7rem; color: var(--terracota); transition: filter 0.4s ease, transform 0.4s ease; }
.nav--dark .nav__brand { color: var(--cal); }
.nav__brand:hover { filter: saturate(1.6) brightness(1.06); transform: scale(1.03); }
.nav--dark .nav__brand:hover { color: var(--terracota); filter: saturate(1.6) brightness(1.1); }
/* ---- Marca (isotipo real de Lu Peña, coloreado por máscara CSS) ---- */
.mark {
  display: inline-block;
  aspect-ratio: 570 / 661;
  background-color: currentColor;
  -webkit-mask: url("../assets/brand/mark.png") center / contain no-repeat;
  mask: url("../assets/brand/mark.png") center / contain no-repeat;
}

.nav__monogram { height: 34px; }
.nav__wordmark {
  font-family: var(--font-word); font-weight: 500;
  font-size: 0.98rem; letter-spacing: 0.16em;
  color: var(--carbon);
  display: flex; flex-direction: column; line-height: 1.1;
}
.nav--dark .nav__wordmark { color: var(--cal); }
.nav__wordmark small {
  font-weight: 300; font-size: 0.52rem; letter-spacing: 0.4em; opacity: 0.6;
}

/* Los 7 encabezados numerados — diminutos, ligeros, con aire */
.nav__links { display: flex; align-items: center; gap: clamp(0.85rem, 1.5vw, 1.5rem); }
.nav__links a {
  font-family: var(--font-word); font-weight: 400; font-size: 0.64rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  position: relative; padding: 0.3rem 0;
  white-space: nowrap;
}
.nav__links a span { color: var(--terracota); margin-right: 0.35em; font-size: 0.9em; }
.nav__links a:not(.nav__cta)::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 100%; height: var(--line-hair); background: var(--terracota);
  transform: scaleX(0); transform-origin: right;
  transition: transform 0.35s cubic-bezier(0.6,0,0.2,1);
}
.nav__links a:not(.nav__cta):hover::after { transform: scaleX(1); transform-origin: left; }
.nav__cta {
  border: 1px solid var(--terracota); color: var(--terracota);
  font-weight: 400;
  padding: 0.5rem 1.1rem !important; border-radius: 999px;
  transition: background 0.3s, color 0.3s;
}
.nav__cta:hover { background: var(--terracota); color: var(--cal); }

.nav__toggle { display: none; }

/* Menú móvil */
.mobile-menu {
  position: fixed; inset: 0; z-index: 99;
  background: color-mix(in srgb, var(--carbon) 92%, transparent);
  backdrop-filter: blur(20px);
  display: flex; flex-direction: column; justify-content: center;
  gap: 2rem; padding: var(--pad);
  opacity: 0; pointer-events: none; transition: opacity 0.4s;
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }
.mobile-menu a {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.7rem, 7vw, 2.7rem); color: var(--cal);
  letter-spacing: -0.01em;
}
.mobile-menu a span {
  font-family: var(--font-mono); font-size: 0.8rem;
  color: var(--terracota); margin-right: 1rem; vertical-align: super;
}

/* padding-bottom + margen negativo: deja respirar el descendente de la "g" en la itálica
   Fraunces sin alterar el interlineado ni el espaciado del bloque */

.hero__title .line > span.caret { border-right: 0.06em solid var(--terracota); animation: caretBlink 0.7s steps(1) infinite; }
@keyframes caretBlink { 50% { border-right-color: transparent; } }

.btn {
  font-family: var(--font-word); font-weight: 400; font-size: 0.7rem;
  letter-spacing: 0.14em; text-transform: uppercase;
  padding: 0.85rem 1.7rem; border-radius: 999px;
  transition: all 0.35s cubic-bezier(0.6,0,0.2,1);
  border: var(--line-hair) solid var(--carbon-suave);
}
.btn--solid { background: var(--terracota); color: var(--cal); border-color: var(--terracota); }
.btn--solid:hover { background: color-mix(in srgb, var(--terracota) 86%, #000); border-color: color-mix(in srgb, var(--terracota) 86%, #000); transform: translateY(-2px); }
.btn--ghost { color: var(--carbon); }
.btn--ghost:hover { border-color: var(--terracota); color: var(--terracota); transform: translateY(-2px); }

/* ---- Retrato circular de la arquitecta ---- */

/* agrandado acentuado al pasar el cursor (click → #arquitecta) */

@keyframes scrollPulse {
  0%,100% { transform: scaleY(1); opacity: 1; }
  50% { transform: scaleY(0.55); opacity: 0.4; }
}

/* Canvas de líneas orgánicas de fondo (Pilares y La Arquitecta) */
.section-topo { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; display: block; pointer-events: none; }
.pillars > :not(.section-topo) { position: relative; z-index: 1; }

/* Mismo fondo que el HERO: líneas orgánicas dinámicas + leve gradiente terracota */

.architect > :not(.section-topo) { position: relative; z-index: 1; }

/* ==========================================================================
   CONTACTO + FOOTER
   ========================================================================== */

.contact > :not(.section-topo) { position: relative; z-index: 1; } /* contenido sobre el canvas orgánico */

/* Aviso flotante "correo copiado" (fallback del mailto) */
.copy-toast {
  position: fixed; z-index: 10001;
  transform: translateX(-50%);
  background: var(--carbon); color: var(--cal);
  font-family: var(--font-word); font-weight: 400;
  font-size: 0.72rem; letter-spacing: 0.06em;
  padding: 0.5rem 0.95rem; border-radius: 999px;
  box-shadow: 0 12px 28px -12px rgba(20,17,14,0.55);
  opacity: 0; pointer-events: none;
  transition: opacity 0.25s ease;
}
.copy-toast.show { opacity: 1; }

/* Redes sociales como íconos (Instagram · Behance) */

/* Botón CTA a WhatsApp */

.btn-cta {
  display: inline-flex; align-items: center; gap: 0.7rem;
  padding: 0.9rem 1.9rem; border-radius: 999px;
  background: var(--terracota); color: var(--cal);
  font-family: var(--font-word); font-weight: 500; font-size: 0.86rem; letter-spacing: 0.02em;
  box-shadow: 0 10px 26px -14px color-mix(in srgb, var(--terracota) 55%, transparent);
  transition: transform 0.35s cubic-bezier(0.34,1.4,0.5,1), box-shadow 0.35s, background 0.35s;
}
.btn-cta svg { transition: transform 0.35s; width: 16px; height: 16px; }
.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px -16px color-mix(in srgb, var(--terracota) 65%, transparent);
  background: color-mix(in srgb, var(--terracota) 92%, #ffffff);
}
.btn-cta:hover svg { transform: scale(1.1) rotate(-6deg); }

/* El contenedor flota (bob suave); la imagen escala al pasar el cursor */

@keyframes floatBob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-14px); } }

/* Texto guía desaturado; desaparece al escribir (comportamiento nativo) */

.contact__form .field.is-error .field__input {
  border-color: #C0483A;
  box-shadow: 0 0 0 3px color-mix(in srgb, #C0483A 14%, transparent);
}

/* Efecto typewriter (título de cierre) */
.tw-caret {
  display: inline-block; width: 0.07em; height: 0.92em; background: var(--terracota);
  margin-left: 0.06em; vertical-align: -0.08em;
  animation: twBlink 0.7s steps(1) infinite;
}
.tw-caret--done { animation: none; opacity: 0; }
@keyframes twBlink { 50% { opacity: 0; } }

/* ==========================================================================
   ANIMACIONES — estados iniciales (JS los revela)
   ========================================================================== */
.reveal { opacity: 0; transform: translateY(36px); }
.split-words .word { display: inline-block; opacity: 0; transform: translateY(0.6em); }

/* Sin JS o con motion reducido: todo visible */
@media (prefers-reduced-motion: reduce) {
  .reveal, .split-words .word { opacity: 1 !important; transform: none !important; }
  .grain { animation: none; }
  
}
.no-js .reveal, .no-js .split-words .word { opacity: 1; transform: none; }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

/* La nav colapsa antes que el resto del layout móvil: 7 encabezados numerados
   necesitan más ancho que el viejo menú de 4 enlaces. */
@media (max-width: 1180px) {
  .nav__links { display: none; }
  .nav__toggle {
    display: flex; flex-direction: column; gap: 6px;
    background: none; border: none; cursor: pointer; padding: 0.4rem;
    z-index: 101;
  }
  .nav__toggle span {
    width: 26px; height: 2px; background: var(--carbon);
    transition: transform 0.35s, opacity 0.35s;
  }
  .nav--dark .nav__toggle span, .nav__toggle.open span { background: var(--cal); }
  .nav__toggle.open span:first-child { transform: translateY(4px) rotate(45deg); }
  .nav__toggle.open span:last-child { transform: translateY(-4px) rotate(-45deg); }
}

@media (max-width: 900px) {
  
  
  
  
  

  /* Hero: el aside pasa al flujo (retrato + métricas debajo del texto) */
  
  
  
  
  
  

  /* Ocultar "Volver arriba" en móvil (se encimaba con el contenido del borde) */
  .back-top { display: none !important; }

  
  
}

/* Pilares en móvil: difuminado a toda la tarjeta + imagen cover para legibilidad */

/* ==========================================================================
   LIGHTBOX / GALERÍA
   ========================================================================== */

.lightbox.open { opacity: 1; visibility: visible; }

.lightbox__close {
  position: absolute; top: clamp(1rem, 3vw, 2rem); right: clamp(1rem, 3vw, 2.5rem);
  z-index: 3; cursor: pointer;
  background: none; border: none; color: var(--cal);
  font-size: 0.7rem; letter-spacing: 0.2em; padding: 0.6rem;
  opacity: 0.75; transition: opacity 0.3s, color 0.3s;
}
.lightbox__close:hover { opacity: 1; color: var(--terracota); }

.lightbox.open .lightbox__panel { transform: none; }

.lightbox__nextproj {
  position: relative; z-index: 2; margin: 0.2rem auto 0;
  display: inline-flex; align-items: center; gap: 0.7rem; cursor: pointer;
  background: none; border: none; color: var(--cal); padding: 0.5rem 0.4rem;
}
.lightbox__nextproj .mono { color: var(--terracota); font-size: 0.6rem; letter-spacing: 0.18em; }
.lightbox__nextproj .lb-next-name { font-family: var(--font-display); font-weight: 600; font-size: clamp(1rem, 2vw, 1.25rem); }
.lightbox__nextproj .lb-next-arrow { color: var(--terracota); font-size: 1.2rem; transition: transform 0.3s; }
.lightbox__nextproj:hover .lb-next-arrow { transform: translateX(7px); }

/* ==========================================================================
   RECORRIDOS 360°
   ========================================================================== */

/* Encabezado en banner con panorama SAKURA interactivo de fondo */

.pano__bg .pnlm-container, .pano__bg .pnlm-render-container { background: transparent !important; }
.pano__bg .pnlm-load-box, .pano__bg .pnlm-about-msg, .pano__bg .pnlm-orientation-button { display: none !important; }

.pano-card:hover img, .pano-card.is-focus img { transform: scale(1.06); }
.pano-card.is-focus { --sc:1.10; --tz:60px; z-index: 20; box-shadow: 0 22px 50px -24px rgba(20,17,14,0.25); }
.pano__grid.has-focus .pano-card:not(.is-focus) { opacity: 0.5; filter: saturate(0.85) brightness(0.92); }

/* Modal 360 */
.pano-modal {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 1rem; padding: clamp(1rem, 3vw, 2.5rem);
  opacity: 0; visibility: hidden; transition: opacity 0.4s, visibility 0.4s;
}
.pano-modal.open { opacity: 1; visibility: visible; }
.pano-modal__backdrop {
  position: absolute; inset: 0;
  background: color-mix(in srgb, var(--carbon) 90%, transparent);
  backdrop-filter: blur(14px);
}
.pano-modal__head { position: relative; z-index: 2; text-align: center; color: var(--cal); }
.pano-modal__head .mono { color: var(--terracota); margin-bottom: 0.3rem; }
.pano-modal__head h3 { font-size: clamp(1.4rem, 3.5vw, 2.4rem); }
.pano-modal__stage {
  position: relative; z-index: 2;
  width: min(1200px, 100%); height: 66vh;
  border-radius: 14px; overflow: hidden;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.7);
}
.pano-modal__hint { position: relative; z-index: 2; color: var(--cal); opacity: 0.55; letter-spacing: 0.2em; }
.pnlm-container { background: var(--carbon) !important; }

/* Visor de Animación en pantalla completa */
.vidbox {
  position: fixed; inset: 0; z-index: 1000;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 1rem; padding: clamp(1rem, 3vw, 2.5rem);
  opacity: 0; visibility: hidden; transition: opacity 0.4s, visibility 0.4s;
}
.vidbox.open { opacity: 1; visibility: visible; }
.vidbox__backdrop {
  position: absolute; inset: 0;
  background: color-mix(in srgb, var(--carbon) 92%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
}
.vidbox__title { position: relative; z-index: 2; color: var(--terracota); letter-spacing: 0.2em; }
.vidbox__stage {
  position: relative; z-index: 2;
  width: min(1280px, 100%); display: flex; flex-direction: column; gap: 0.9rem; align-items: center;
}
.vidbox__frame { position: relative; width: 100%; display: flex; align-items: center; justify-content: center; }
.vidbox__frame video {
  width: 100%; max-height: 78vh; border-radius: 14px; background: #000;
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.7);
}
.vidbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 3;
  width: 52px; height: 52px; border-radius: 50%; cursor: pointer;
  display: grid; place-items: center; font-size: 1.8rem; line-height: 1;
  color: var(--cal); background: color-mix(in srgb, var(--terracota) 90%, transparent);
  border: none; box-shadow: 0 10px 26px -10px rgba(0,0,0,0.6);
  transition: transform 0.3s, background 0.3s;
}
.vidbox__nav:hover { transform: translateY(-50%) scale(1.1); background: var(--terracota); }
.vidbox__prev { left: clamp(-0.5rem, -2vw, -1.6rem); }
.vidbox__next { right: clamp(-0.5rem, -2vw, -1.6rem); }
.vidbox__counter { color: color-mix(in srgb, var(--cal) 70%, transparent); letter-spacing: 0.25em; }

/* ==========================================================================
   ANIMACIÓN — galería de secuencias animadas
   ========================================================================== */

/* Portada: video TERRACOTA BEDROOM con reproducción por scroll (usa el banner unificado) */

.anim-card.is-focus { --sc:1.10; --tz:60px; z-index: 20; box-shadow: 0 22px 50px -24px rgba(20,17,14,0.25); }
.anim-card.is-focus .anim-card__video { transform: scale(1.06); }
.anim__grid.has-focus .anim-card:not(.is-focus) { opacity: 0.5; filter: saturate(0.85) brightness(0.92); }

.anim-card.is-playing .anim-card__badge { opacity: 1; transform: none; }

/* ==========================================================================
   PROYECTOS POR TIPOLOGÍA (estantes horizontales)
   ========================================================================== */

/* Partícula enfocada: se expande y se eleva */
.typo__shelf .pcard.is-focus { --sc: 1.12; z-index: 6; box-shadow: 0 44px 90px -34px rgba(0,0,0,0.55); }
.typo__shelf .pcard.is-focus .pcard__cap { opacity: 1; transform: none; }
/* Las demás partículas se atenúan y ceden espacio */
.typo__shelf .pcard.is-dim { opacity: 0.45; filter: saturate(0.82) brightness(0.92); }

         /* ---- Cursor personalizado (círculo terracota, sin relleno) ---- */
@media (hover: hover) and (pointer: fine) {
  html.has-cursor, html.has-cursor * { cursor: none !important; }
  .cursor-ring {
    position: fixed; top: 0; left: 0; z-index: 10000;
    width: 34px; height: 34px; border-radius: 50%;
    border: 1.5px solid var(--terracota);
    transform: translate(-50%, -50%);
    pointer-events: none; will-change: transform;
    transition: width 0.28s cubic-bezier(0.4,0,0.2,1), height 0.28s cubic-bezier(0.4,0,0.2,1),
                background 0.28s, border-color 0.28s, opacity 0.3s;
  }
  .cursor-ring.is-hover {
    width: 58px; height: 58px;
    background: color-mix(in srgb, var(--terracota) 12%, transparent);
  }
  .cursor-ring.is-down { width: 26px; height: 26px; }
  .cursor-dot {
    position: fixed; top: 0; left: 0; z-index: 10000;
    width: 5px; height: 5px; border-radius: 50%;
    background: var(--terracota);
    transform: translate(-50%, -50%);
    pointer-events: none; will-change: transform;
  }
}

/* ---- Botones flotantes (volver arriba + tema) ---- */
.floating-ui {
  position: fixed; right: clamp(0.9rem, 1.8vw, 1.6rem); bottom: clamp(1.2rem, 3vh, 2.2rem);
  z-index: 300; display: flex; flex-direction: column; align-items: center; gap: 1.4rem;
}

/* ---- Switch de tema — vertical, compacto y estilizado ---- */
.theme-switch {
  display: inline-flex; padding: 0; border: none; background: none; cursor: pointer;
}
.theme-switch__track {
  position: relative;
  display: flex; flex-direction: column; align-items: center; justify-content: space-between;
  width: 30px; height: 60px; padding: 7px 0; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--carbon) 20%, transparent);
  background: color-mix(in srgb, var(--cal) 55%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.2); backdrop-filter: blur(14px) saturate(1.2);
  transition: border-color 0.3s, background 0.3s;
}
.theme-switch:hover .theme-switch__track { border-color: var(--terracota); }
/* iconos guía tenues en los extremos (sol arriba, luna abajo) */
.theme-switch__ghost {
  width: 12px; height: 12px; color: var(--carbon); opacity: 0.4; z-index: 0;
  transition: opacity 0.3s;
}
/* knob terracota que se desliza y lleva el icono activo */
.theme-switch__knob {
  position: absolute; left: 50%; top: 4px; transform: translateX(-50%);
  width: 22px; height: 22px; border-radius: 50%;
  display: grid; place-items: center; color: var(--cal);
  background: var(--terracota); z-index: 1;
  box-shadow: 0 4px 12px -3px color-mix(in srgb, var(--terracota) 60%, transparent);
  transition: top 0.42s cubic-bezier(0.6,0,0.2,1);
}
.theme-switch__knob svg { width: 13px; height: 13px; grid-area: 1 / 1; }
.theme-switch__knob .icon-moon { display: none; }
/* Light: knob arriba (sol); oculta el sol guía que queda debajo */
html:not([data-theme="dark"]) .theme-switch__ghost.icon-sun { opacity: 0; }
/* Dark: knob abajo (luna) */
html[data-theme="dark"] .theme-switch__knob { top: calc(100% - 26px); }
html[data-theme="dark"] .theme-switch__knob .icon-sun { display: none; }
html[data-theme="dark"] .theme-switch__knob .icon-moon { display: block; }
html[data-theme="dark"] .theme-switch__ghost.icon-moon { opacity: 0; }

/* ---- Volver arriba — etiqueta vertical con línea ---- */
.back-top {
  display: none; flex-direction: column; align-items: center; gap: 0.7rem;
  background: none; border: none; cursor: pointer; padding: 0.3rem;
  color: var(--carbon); opacity: 0;
  transition: opacity 0.4s, color 0.3s;
}
.back-top.show { display: inline-flex; opacity: 0.85; }
.back-top:hover { color: var(--terracota); opacity: 1; }
.back-top__text { writing-mode: vertical-rl; transform: rotate(180deg); font-size: 0.66rem; letter-spacing: 0.24em; }
.back-top__line { width: 1px; height: 46px; background: currentColor; opacity: 0.6; }

/* Fijada por JS mientras se recorre Proyectos → Recorridos 360° → Animación */
.proj-filter.is-pinned {
  position: fixed; top: clamp(64px, 9vh, 82px); left: 0; right: 0;
  margin-bottom: 0; padding: 0 clamp(1rem, 4vw, 2rem);
}

.proj-filter__btn.is-active { background: var(--terracota); color: var(--cal); }

.typo.is-hidden { display: none; }

/* ==========================================================================
   FASE 4c — Portafolio mosaico mixto tipo partículas (3D)
   ========================================================================== */

/* Partícula enfocada: se expande y se adelanta en 3D; las demás retroceden */
.portfolio .pcard.is-focus {
  --sc: 1.10; --tz: 60px; z-index: 20;
  box-shadow: 0 22px 50px -24px rgba(20, 17, 14, 0.25);
}
.portfolio .pcard.is-focus .pcard__media img { transform: scale(1.06); }
.portfolio .pcard.is-focus .pcard__cap { opacity: 1; transform: none; }
.portfolio.has-focus .pcard:not(.is-focus) { opacity: 0.5; filter: saturate(0.85) brightness(0.92); }

/* Filtrado: desvanecer y recolocar */

.portfolio .pcard.is-gone { display: none; }