/* Presentación animada de entrada a Proyectos («Del plano a la realidad»): estética de plano técnico,
   azul de plano, trazo cian y luz ámbar de atardecer. */
@font-face{font-family:"Josefin";src:url(../fonts/josefin-sans-latin-700-normal.woff2) format("woff2");font-weight:700;font-display:swap}
@font-face{font-family:"Josefin";src:url(../fonts/josefin-sans-latin-600-normal.woff2) format("woff2");font-weight:600;font-display:swap}
@font-face{font-family:"Josefin";src:url(../fonts/josefin-sans-latin-300-normal.woff2) format("woff2");font-weight:300;font-display:swap}

.intro{position:fixed;inset:0;z-index:1000;overflow:hidden;background:#071426;color:#eaf4ff;font-family:"Josefin","Century Gothic",sans-serif;
  --noche:#071426;--plano:#0f2f57;--cian:#67d4f5;--ambar:#f4a340;--blanco:#eaf4ff}
.intro[hidden]{display:none}
.intro.fuera{opacity:0;transition:opacity .9s ease}
.intro .escena{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;opacity:0;overflow:hidden}

/* Fondos */
.intro .noche{background:radial-gradient(ellipse at 50% 40%,#0e2544,#050d1a 80%)}
.intro .plano{background:linear-gradient(160deg,#16447a,#0b2748)}
.intro .ambar{background:linear-gradient(160deg,#f7b458,#e8872a);color:var(--noche)}
.intro .cuadricula{position:absolute;inset:0;pointer-events:none;background:
   repeating-linear-gradient(0deg,rgba(103,212,245,.10) 0 1px,transparent 1px 24px),
   repeating-linear-gradient(90deg,rgba(103,212,245,.10) 0 1px,transparent 1px 24px),
   repeating-linear-gradient(0deg,rgba(103,212,245,.16) 0 1px,transparent 1px 120px),
   repeating-linear-gradient(90deg,rgba(103,212,245,.16) 0 1px,transparent 1px 120px)}
.intro .ambar .cuadricula{background:
   repeating-linear-gradient(0deg,rgba(7,20,38,.10) 0 1px,transparent 1px 24px),
   repeating-linear-gradient(90deg,rgba(7,20,38,.10) 0 1px,transparent 1px 24px)}

/* Líneas de la cuadrícula que se trazan */
.intro .trazos{position:absolute;inset:0;pointer-events:none}
.intro .trazos i{position:absolute;background:rgba(103,212,245,.35)}
.intro .trazos .h{left:0;right:0;height:1px;transform-origin:left}
.intro .trazos .v{top:0;bottom:0;width:1px;transform-origin:top}

/* Textos */
.intro .palabra{display:block;position:relative;font-weight:700;line-height:1.05;letter-spacing:.08em;text-transform:uppercase;white-space:nowrap}
.intro .palabra.fina{font-weight:300;letter-spacing:.32em}
.intro .palabra .bloque{position:absolute;inset:-.04em -.12em;background:var(--ambar);transform:scaleX(0);transform-origin:left;pointer-events:none}
.intro .ambar .palabra .bloque{background:var(--noche)}
.intro .palabra .txt{display:inline-block}
.intro .acento{color:var(--ambar)}
.intro .lema-intro{font-weight:300;letter-spacing:.4em;text-transform:uppercase;font-size:clamp(13px,3.2vmin,30px);margin-top:2.4vmin;opacity:.9}

/* Cota (línea de medida) */
.intro .cota{position:relative;width:min(70vw,640px);height:18px;margin:3vmin auto 0;color:var(--cian)}
.intro .ambar .cota{color:var(--noche)}
.intro .cota::before{content:"";position:absolute;left:0;right:0;top:50%;border-top:1px solid currentColor}
.intro .cota::after{content:"";position:absolute;inset:0;border-left:1px solid currentColor;border-right:1px solid currentColor}
.intro .cota span{position:absolute;left:50%;top:-1.5em;transform:translateX(-50%);font-size:clamp(10px,1.8vmin,16px);letter-spacing:.2em;font-weight:600}

/* Marcas de registro en las esquinas */
.intro .registro{position:absolute;width:26px;height:26px;color:var(--cian);opacity:.8}
.intro .registro::before,.intro .registro::after{content:"";position:absolute;background:currentColor}
.intro .registro::before{left:50%;top:0;bottom:0;width:1px}
.intro .registro::after{top:50%;left:0;right:0;height:1px}
.intro .r1{left:6vmin;top:6vmin}.intro .r2{right:6vmin;top:6vmin}.intro .r3{left:6vmin;bottom:6vmin}.intro .r4{right:6vmin;bottom:6vmin}
.intro .coord{position:absolute;left:6vmin;bottom:calc(6vmin + 34px);font-size:clamp(9px,1.6vmin,14px);letter-spacing:.25em;color:var(--cian);opacity:.8;font-weight:600}

/* Logo en su marco trazado */
.intro .marco-logo{position:relative;width:clamp(90px,20vmin,220px);aspect-ratio:1;margin-bottom:3.5vmin;display:flex;align-items:center;justify-content:center}
.intro .marco-logo svg{position:absolute;inset:0;width:100%;height:100%;overflow:visible}
.intro .marco-logo img{width:70%;height:auto}
.intro svg .t{fill:none;stroke:currentColor;stroke-width:1.5;stroke-dasharray:1;stroke-dashoffset:1;vector-effect:non-scaling-stroke}

/* Alzado dibujado a línea */
.intro .alzado{width:min(84vw,62vh,720px);height:auto;color:var(--blanco);margin-bottom:3vmin}
.intro .alzado .t.fino{stroke-width:1;opacity:.7}
.intro .alzado .t.cian{color:var(--cian)}

/* Fotografías: del plano (azul) a la realidad (color) */
.intro .foto{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.intro .foto.azul{filter:grayscale(1) contrast(1.35) brightness(.62) sepia(1) hue-rotate(170deg) saturate(2.4)}
.intro .linea-luz{position:absolute;background:var(--ambar);box-shadow:0 0 24px 6px rgba(244,163,64,.55)}
.intro .pie-foto{position:absolute;left:0;right:0;bottom:9vmin;display:flex;flex-direction:column;align-items:center;text-shadow:0 2px 20px rgba(0,0,0,.75)}
.intro .etiqueta{position:absolute;left:5vmin;top:5vmin;font-size:clamp(10px,1.9vmin,17px);letter-spacing:.3em;text-transform:uppercase;font-weight:600;
  padding:.6em 1em;background:rgba(7,20,38,.72);border-left:3px solid var(--ambar)}

/* Tríptico de franjas */
.intro .franjas{position:absolute;inset:0;display:flex;flex-direction:column}
.intro .franja{position:relative;flex:1;overflow:hidden;border-bottom:3px solid var(--noche)}
.intro .franja img{width:100%;height:100%;object-fit:cover}
.intro .franja .etiqueta{top:auto;bottom:2.4vmin}
.intro .banda{position:absolute;left:0;right:0;top:50%;transform:translateY(-50%);padding:2vmin 0;background:rgba(7,20,38,.82);z-index:2}

/* Mosaico */
.intro .mosaico{position:absolute;inset:3vmin;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(5,1fr);gap:1.4vmin}
@media (orientation:landscape){.intro .mosaico{grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(3,1fr)}}
.intro .mosaico img{width:100%;height:100%;object-fit:cover;display:block}
.intro .rotulo{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;padding:2.4vmin 4vmin;background:var(--ambar);color:var(--noche)}

/* Cartel final */
.intro .cartel .foto-cartel{position:relative;width:min(86vw,68vh,820px);aspect-ratio:2/1;margin:3.4vmin auto}
.intro .cartel .foto-cartel img{width:100%;height:100%;object-fit:cover;display:block}
.intro .esquina{position:absolute;width:9%;aspect-ratio:1;border:2px solid var(--ambar)}
.intro .e1{left:-12px;top:-12px;border-right:0;border-bottom:0}.intro .e2{right:-12px;top:-12px;border-left:0;border-bottom:0}
.intro .e3{left:-12px;bottom:-12px;border-right:0;border-top:0}.intro .e4{right:-12px;bottom:-12px;border-left:0;border-top:0}
.intro .cartel .logo{width:clamp(40px,8vmin,90px);height:auto;margin-bottom:2vmin}
.intro .llamada{margin-top:2vmin;padding:.8em 1.4em;border:1px solid var(--cian);color:var(--cian);font-weight:600;letter-spacing:.14em;font-size:min(3.2vw,2.4vh)}

/* Portada de entrada y botones */
.intro .portada{opacity:1;z-index:50;gap:2.4vmin}
.intro .portada .logo{width:clamp(70px,14vmin,160px);height:auto}
.intro .botones-intro{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin-top:3vmin}
.intro .botones-intro button,.intro .saltar{font-family:"Century Gothic",CenturyGothic,sans-serif;font-size:15px;letter-spacing:.06em;cursor:pointer;border-radius:0}
.intro .entrar{background:var(--ambar);color:var(--noche);border:1px solid var(--ambar);padding:15px 26px;font-weight:700}
.intro .entrar:hover{background:#ffb95e}
.intro .silencio{background:transparent;color:var(--blanco);border:1px solid rgba(103,212,245,.6);padding:15px 26px}
.intro .silencio:hover{background:rgba(103,212,245,.1)}
.intro .saltar{position:absolute;right:18px;top:18px;z-index:60;background:rgba(7,20,38,.6);color:#fff;border:1px solid rgba(103,212,245,.45);padding:9px 16px}
.intro .saltar:hover{background:rgba(7,20,38,.9)}
.intro.video .saltar,.intro.video .portada{display:none}
@media (prefers-reduced-motion:reduce){.intro{display:none}}
.intro .palabra.chica{font-weight:600;letter-spacing:.24em}
.intro .pie-foto .palabra .bloque{background:var(--ambar)}