/* ══════════════════════════════════════════════════════════════════════
   Tantalus Valve — hoja de estilo
   Sistema derivado de la marca v3 "Bloque": montaña, reflejo y la línea
   de cierre entre ambas. Las secciones alternan roca y papel; cada
   costura es una regla fina con el isotipo montado encima.
   ══════════════════════════════════════════════════════════════════════ */

:root{
  /* Paleta de marca */
  --roca:#102422;
  --agua:#37736E;
  --agua-cl:#4E938D;
  --acero:#6F8783;
  --acero-cl:#96AAA6;
  --gris:#6C7681;
  --papel:#F2F5F4;
  --papel-alt:#E6EDEB;

  --rule-dark:rgba(242,245,244,.15);
  --rule-light:rgba(16,36,34,.14);
  --veil:rgba(242,245,244,.045);

  /* Tipografía: Archivo para titulares y rótulos, Instrument Sans para lectura */
  --display:"Archivo","Helvetica Neue",Arial,sans-serif;
  --body:"Instrument Sans","Helvetica Neue",Arial,sans-serif;

  --wrap:1200px;
  --gut:clamp(20px,4vw,44px);
  --hd-h:78px;
  --r:3px;
}

*,*::before,*::after{box-sizing:border-box}

html{scroll-behavior:smooth;scroll-padding-top:calc(var(--hd-h) + 16px);-webkit-text-size-adjust:100%}

body{
  margin:0;
  background:var(--papel);
  color:var(--roca);
  font-family:var(--body);
  font-size:17px;
  line-height:1.62;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg{max-width:100%;height:auto;display:block}

h1,h2,h3{
  font-family:var(--display);
  font-weight:650;
  font-stretch:112%;
  letter-spacing:-.028em;
  line-height:1.08;
  margin:0;
  text-wrap:balance;
}

p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gut)}

.skip{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--agua);color:#fff;padding:12px 18px;font-weight:600;
}
.skip:focus{left:12px;top:12px}

:focus-visible{outline:2px solid var(--agua-cl);outline-offset:3px;border-radius:2px}

/* ────────────────────────── Rótulos ────────────────────────── */

.eyebrow{
  font-family:var(--display);
  font-size:.7rem;
  font-weight:600;
  font-stretch:105%;
  letter-spacing:.19em;
  text-transform:uppercase;
  color:var(--acero-cl);
  margin:0 0 18px;
}
.eyebrow--dark{color:var(--agua)}

/* ────────────────────────── Bandas ────────────────────────── */

.band{position:relative}
.band--roca{background:var(--roca);color:var(--papel)}
.band--papel{background:var(--papel);color:var(--roca)}

.sec{padding-block:clamp(70px,8.5vw,124px)}

.sec__hd{max-width:760px;margin-bottom:clamp(38px,4.6vw,60px)}
.sec__h2{font-size:clamp(1.85rem,3.5vw,2.95rem)}
.sec__h2--rev{color:var(--papel)}
.sec__lead{margin-top:20px;font-size:1.06rem;color:var(--gris);max-width:64ch}
.sec__lead--rev{color:var(--acero-cl)}

/* ────────────────────────── Costura (línea de cierre) ────────────────────────── */

.seam{
  display:flex;align-items:center;gap:20px;
  padding:0 var(--gut);
  background:var(--papel);
}
.seam--flip{background:var(--roca)}
.seam__rule{flex:1;height:1px;background:var(--rule-light);transform-origin:center}
.seam--flip .seam__rule{background:var(--rule-dark)}
.seam__iso{width:30px;height:30px;flex:none;opacity:.9}

/* ────────────────────────── Cabecera ────────────────────────── */

.hd{
  position:sticky;top:0;z-index:80;
  height:var(--hd-h);
  background:rgba(16,36,34,.92);
  backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid var(--rule-dark);
}
.hd__in{height:var(--hd-h);display:flex;align-items:center;justify-content:space-between;gap:24px}
.hd__brand img{width:auto;height:38px}

.hd__nav{display:flex;gap:28px;margin-left:auto;margin-right:8px}
.hd__nav a{
  text-decoration:none;color:var(--acero-cl);
  font-size:.9rem;font-weight:500;
  padding:6px 0;border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.hd__nav a:hover{color:var(--papel);border-bottom-color:var(--agua-cl)}

.hd__act{display:flex;align-items:center;gap:12px}

.hd__burger{
  display:none;width:38px;height:38px;padding:0;
  background:none;border:1px solid var(--rule-dark);border-radius:var(--r);
  cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:5px;
}
.hd__burger span{display:block;width:16px;height:1.5px;background:var(--papel);transition:transform .24s ease,opacity .24s ease}
.hd__burger[aria-expanded="true"] span:first-child{transform:translateY(3.2px) rotate(45deg)}
.hd__burger[aria-expanded="true"] span:last-child{transform:translateY(-3.2px) rotate(-45deg)}

.hd__mob{
  display:none;flex-direction:column;
  background:var(--roca);border-bottom:1px solid var(--rule-dark);
  padding:8px var(--gut) 20px;
}
.hd__mob a{
  text-decoration:none;color:var(--acero-cl);
  padding:13px 0;border-bottom:1px solid var(--rule-dark);
  font-size:1rem;font-weight:500;
}
.hd__mob.is-open{display:flex}

/* ────────────────────────── Botones ────────────────────────── */

.btn{
  --btn-bg:transparent; --btn-fg:var(--papel); --btn-bd:var(--rule-dark);
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  background:var(--btn-bg);color:var(--btn-fg);border:1px solid var(--btn-bd);
  border-radius:var(--r);
  padding:14px 24px;
  font-family:var(--display);
  font-size:.92rem;font-weight:600;font-stretch:104%;letter-spacing:.005em;
  text-decoration:none;cursor:pointer;
  transition:transform .16s ease,background-color .2s ease,border-color .2s ease,color .2s ease;
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}

.btn--solid{--btn-bg:var(--agua);--btn-fg:#fff;--btn-bd:var(--agua)}
.btn--solid:hover{--btn-bg:var(--agua-cl);--btn-bd:var(--agua-cl)}

.btn--wire{--btn-bd:rgba(242,245,244,.28)}
.btn--wire:hover{--btn-bd:var(--agua-cl);--btn-fg:var(--agua-cl)}

.band--papel .btn--wire{--btn-fg:var(--roca);--btn-bd:rgba(16,36,34,.24)}
.band--papel .btn--wire:hover{--btn-fg:var(--agua);--btn-bd:var(--agua)}

.btn--bare{--btn-bd:transparent;--btn-fg:var(--gris)}
.btn--bare:hover{--btn-fg:var(--agua)}

.btn--sm{padding:9px 17px;font-size:.85rem}

/* ────────────────────────── Portada ────────────────────────── */

.hero{position:relative;padding-top:clamp(52px,7vw,92px);padding-bottom:clamp(30px,4vw,50px);overflow:hidden}
.hero__in{position:relative;z-index:2}
.hero__iso{width:clamp(54px,6vw,82px);height:auto;margin-bottom:clamp(20px,2.4vw,30px)}
.hero__eb{margin-bottom:26px}

/* El corte de la válvula acompaña al titular; nunca compite con él. */
.hero__art{
  position:absolute;z-index:1;
  top:clamp(110px,14vw,215px);
  right:-180px;
  width:clamp(300px,34vw,440px);height:auto;
  opacity:.45;pointer-events:none;
  /* Emerge desde el borde en vez de aparecer cortado. */
  -webkit-mask-image:linear-gradient(to right,transparent 0,#000 24%);
  mask-image:linear-gradient(to right,transparent 0,#000 24%);
}

/* Firma de la página: el titular y su reflejo, separados por la línea de
   cierre — el mismo gesto del isotipo, llevado a la tipografía. */
.mirror{position:relative}

.hero__h1{
  font-size:clamp(2.15rem,7vw,5.7rem);
  font-weight:680;
  font-stretch:118%;
  line-height:.96;
  letter-spacing:-.042em;
  max-width:16ch;
  text-wrap:balance;
}
.hero__hl{color:var(--agua-cl)}

.mirror__rule{
  display:block;height:1px;background:var(--rule-dark);
  margin:clamp(16px,2vw,26px) 0 0;
  transform-origin:left center;
}

/* El eco recorta desde arriba; su contenido va volteado, de modo que lo que
   asoma bajo la regla es la última línea del titular, reflejada. */
.mirror__echo{
  margin-top:clamp(16px,2vw,26px);
  height:clamp(34px,4.4vw,72px);
  overflow:hidden;
  opacity:.28;
  -webkit-mask-image:linear-gradient(to top,transparent 4%,#000 86%);
  mask-image:linear-gradient(to top,transparent 4%,#000 86%);
  pointer-events:none;
  user-select:none;
}
.mirror__echo-in{
  font-family:var(--display);
  font-size:clamp(2.15rem,7vw,5.7rem);
  font-weight:680;
  font-stretch:118%;
  line-height:.96;
  letter-spacing:-.042em;
  max-width:16ch;
  text-wrap:balance;
  color:var(--papel);
  transform:scaleY(-1);
}

.hero__foot{
  display:grid;grid-template-columns:1.25fr .95fr;
  gap:clamp(30px,5vw,72px);
  align-items:end;
  margin-top:clamp(30px,4vw,54px);
}
.hero__lead{font-size:1.08rem;color:var(--acero-cl);max-width:56ch}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px}

.facts{
  display:grid;grid-template-columns:repeat(4,1fr);
  gap:1px;background:var(--rule-dark);
  border:1px solid var(--rule-dark);border-radius:var(--r);
  margin-top:clamp(48px,6vw,84px);
  overflow:hidden;
}
.facts li{background:var(--roca);padding:22px 22px 20px;display:flex;flex-direction:column;gap:4px}
.facts b{
  font-family:var(--display);font-size:1.16rem;font-weight:650;font-stretch:108%;
  letter-spacing:-.02em;color:var(--papel);
}
.facts span{font-size:.83rem;color:var(--acero);line-height:1.4}

/* ────────────────────────── Propósito ────────────────────────── */

.mision{
  font-family:var(--display);
  font-size:clamp(1.5rem,3.2vw,2.4rem);
  font-weight:500;font-stretch:106%;
  line-height:1.24;letter-spacing:-.025em;
  color:var(--roca);
  max-width:20ch;
  padding-left:clamp(16px,2.4vw,26px);
  border-left:2px solid var(--agua);
  margin-bottom:clamp(46px,5.5vw,74px);
  text-wrap:balance;
}
.mision b{font-weight:680;color:var(--agua)}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--rule-light);border-block:1px solid var(--rule-light)}
.card{background:var(--papel);padding:clamp(26px,3vw,38px) clamp(22px,2.4vw,32px)}
.card__k{
  font-family:var(--display);font-size:.68rem;font-weight:600;font-stretch:105%;
  letter-spacing:.18em;text-transform:uppercase;color:var(--agua);margin-bottom:16px;
}
.card__h{font-size:1.2rem;font-weight:650;margin-bottom:12px;letter-spacing:-.018em}
.card p{color:var(--gris);font-size:.97rem}

.statement{
  margin-top:clamp(38px,4.5vw,58px);
  font-size:clamp(1.05rem,1.7vw,1.24rem);
  line-height:1.5;color:var(--roca);max-width:70ch;
}
.statement b{font-weight:600;color:var(--agua)}

/* ────────────────────────── Frentes de trabajo ────────────────────────── */

.frentes{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(18px,2vw,26px)}
.frente{
  border:1px solid var(--rule-dark);border-radius:var(--r);
  background:var(--veil);
  padding:clamp(26px,2.8vw,36px);
  display:flex;flex-direction:column;gap:16px;
  transition:border-color .25s ease,transform .25s ease;
}
.frente:hover{border-color:rgba(78,147,141,.5);transform:translateY(-2px)}
.frente__art{
  width:100%;max-width:230px;height:auto;
  margin:-6px auto 6px;
  opacity:.72;
  transition:opacity .3s ease,transform .3s ease;
}
.frente:hover .frente__art{opacity:1;transform:translateY(-2px)}
.frente__h{font-size:1.3rem;color:var(--papel);letter-spacing:-.022em}
.frente__p{color:var(--acero-cl);font-size:.98rem;flex:1}
.frente__k{
  font-family:var(--display);font-size:.7rem;font-weight:600;font-stretch:105%;
  letter-spacing:.14em;text-transform:uppercase;color:var(--agua-cl);
  padding-top:16px;border-top:1px solid var(--rule-dark);
}

.disclosure{
  margin-top:clamp(34px,4vw,50px);
  padding:22px 26px;
  border-left:2px solid var(--agua);
  background:rgba(16,36,34,.035);
  font-size:.98rem;color:var(--gris);max-width:78ch;
}
.disclosure b{color:var(--roca);font-weight:600}
.disclosure--rev{background:var(--veil);color:var(--acero-cl);border-left-color:var(--agua-cl)}
.disclosure--rev b{color:var(--papel)}

/* ────────────────────────── Compromisos ────────────────────────── */

.valores{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:var(--rule-light);border:1px solid var(--rule-light);border-radius:var(--r);overflow:hidden}
.valor{background:var(--papel);padding:clamp(28px,3vw,40px)}
.valor__h{
  font-size:1.22rem;letter-spacing:-.02em;margin-bottom:13px;
  padding-bottom:13px;border-bottom:1px solid var(--rule-light);
}
.valor p{color:var(--gris);font-size:.98rem}

/* ────────────────────────── Banda de marca ────────────────────────── */

.marca{padding-block:clamp(52px,6vw,82px);overflow:hidden}

/* La línea de proceso corre de borde a borde; en pantallas angostas se
   recorta al centro en vez de encogerse hasta volverse ilegible. */
.marca__linea{overflow:hidden;display:flex;justify-content:center}
.marca__linea img{width:100%;min-width:1100px;height:auto;opacity:.62}

.marca__in{
  display:flex;flex-direction:column;align-items:center;gap:clamp(18px,2.4vw,28px);
  text-align:center;
  margin-top:clamp(34px,4.5vw,58px);
}
.marca__logo{width:clamp(230px,30vw,380px);height:auto}
.marca__claim{
  font-family:var(--display);
  font-size:clamp(1.06rem,1.9vw,1.36rem);
  font-weight:500;font-stretch:106%;letter-spacing:-.018em;
  color:var(--acero-cl);max-width:32ch;
}

/* ────────────────────────── Contacto ────────────────────────── */

.cont{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(30px,4.5vw,70px);align-items:start}

.cont__blk{padding-bottom:26px;margin-bottom:26px;border-bottom:1px solid var(--rule-light)}
.cont__blk:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0}
.cont__k{
  font-family:var(--display);font-size:.68rem;font-weight:600;font-stretch:105%;
  letter-spacing:.18em;text-transform:uppercase;color:var(--agua);margin-bottom:14px;
}
.cont__big{
  display:block;
  font-family:var(--display);font-size:clamp(1.02rem,1.7vw,1.22rem);
  font-weight:600;font-stretch:106%;letter-spacing:-.018em;
  color:var(--roca);text-decoration:none;
  padding:4px 0;
  transition:color .2s ease;
  overflow-wrap:anywhere;
}
.cont__big:hover{color:var(--agua)}
.cont__p{color:var(--gris);font-size:.98rem}

.cont__form{
  border:1px solid var(--rule-light);border-radius:var(--r);
  background:var(--papel-alt);
  padding:clamp(24px,3vw,36px);
  display:flex;flex-direction:column;gap:16px;
}

.fld{display:flex;flex-direction:column;gap:7px}
.fld__l{
  font-family:var(--display);font-size:.68rem;font-weight:600;font-stretch:105%;
  letter-spacing:.15em;text-transform:uppercase;color:var(--gris);
}
.fld-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

.fld input,.fld select,.fld textarea{
  width:100%;
  font-family:var(--body);font-size:.98rem;color:var(--roca);
  background:var(--papel);
  border:1px solid var(--rule-light);border-radius:var(--r);
  padding:12px 14px;
  transition:border-color .2s ease,box-shadow .2s ease;
}
.fld textarea{resize:vertical;min-height:110px;line-height:1.55}
.fld select{
  appearance:none;cursor:pointer;padding-right:38px;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8' fill='none' stroke='%236C7681' stroke-width='1.8'%3E%3Cpath d='M1 1.5 6 6.5 11 1.5'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 14px center;
}
.fld input:focus,.fld select:focus,.fld textarea:focus{
  outline:none;border-color:var(--agua);box-shadow:0 0 0 3px rgba(55,115,110,.14);
}
.fld input::placeholder,.fld textarea::placeholder{color:#8D9795}

.cont__err{
  color:#8F3325;font-size:.9rem;font-weight:500;
  background:rgba(143,51,37,.08);border-left:2px solid #8F3325;
  padding:10px 14px;
}
.cont__btns{display:flex;flex-wrap:wrap;gap:10px;margin-top:4px}
.cont__fine{font-size:.84rem;color:var(--gris);line-height:1.5}

/* ────────────────────────── Pie ────────────────────────── */

.ft{background:var(--roca);color:var(--papel);padding-top:clamp(50px,6vw,76px)}
.ft__in{display:grid;grid-template-columns:auto 1fr;gap:clamp(34px,5vw,72px);padding-bottom:44px}
.ft__brand img{width:auto;height:clamp(56px,7vw,76px)}
.ft__desc{margin-top:14px;font-size:.86rem;color:var(--acero)}

.ft__cols{display:grid;grid-template-columns:repeat(4,1fr);gap:26px}
.ft__k{
  font-family:var(--display);font-size:.66rem;font-weight:600;font-stretch:105%;
  letter-spacing:.17em;text-transform:uppercase;color:var(--acero);margin-bottom:14px;
}
.ft__cols a,.ft__cols p{
  display:block;color:var(--acero-cl);font-size:.92rem;text-decoration:none;line-height:1.72;
  overflow-wrap:anywhere;
}
.ft__cols a{transition:color .2s ease}
.ft__cols a:hover{color:var(--papel)}

.ft__legal{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  padding-block:22px;border-top:1px solid var(--rule-dark);
  font-size:.82rem;color:var(--acero);
}

/* ────────────────────────── Aviso flotante ────────────────────────── */

.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,16px);
  background:var(--roca);color:var(--papel);
  border:1px solid var(--rule-dark);border-radius:var(--r);
  padding:13px 22px;font-size:.92rem;font-weight:500;
  opacity:0;pointer-events:none;z-index:120;
  transition:opacity .26s ease,transform .26s ease;
  box-shadow:0 12px 34px rgba(16,36,34,.3);
  max-width:calc(100vw - 32px);text-align:center;
}
.toast.is-on{opacity:1;transform:translate(-50%,0)}

/* ────────────────────────── Revelado al hacer scroll ────────────────────────── */

.js .reveal{
  opacity:0;transform:translateY(14px);
  transition:opacity .62s ease,transform .62s cubic-bezier(.2,.7,.3,1);
}
.js .reveal.is-in{opacity:1;transform:none}

.js .mirror__rule{transform:scaleX(0);transition:transform .95s cubic-bezier(.2,.7,.3,1) .25s}
.js .mirror.is-in .mirror__rule{transform:scaleX(1)}
.js .seam__rule{transform:scaleX(0);transition:transform .85s cubic-bezier(.2,.7,.3,1)}
.js .seam.is-in .seam__rule{transform:scaleX(1)}
.js .seam__iso{opacity:0;transition:opacity .5s ease .3s}
.js .seam.is-in .seam__iso{opacity:.9}

/* Entrada de portada */
.js .hero__iso,.js .hero__eb,.js .hero__h1,.js .hero__foot{
  opacity:0;transform:translateY(18px);
  animation:entra .8s cubic-bezier(.2,.7,.3,1) forwards;
}
.js .hero__iso{animation-delay:0s}
.js .hero__eb{animation-delay:.1s}
.js .hero__h1{animation-delay:.18s}
.js .hero__foot{animation-delay:.34s}

.js .hero__art{opacity:0;animation:entra-art 1.2s cubic-bezier(.2,.7,.3,1) .5s forwards}
@keyframes entra-art{from{transform:translateX(24px)}to{opacity:.45;transform:none}}

.js .mirror__echo{
  opacity:0;
  animation:entra-echo 1s cubic-bezier(.2,.7,.3,1) .46s forwards;
}

@keyframes entra{to{opacity:1;transform:none}}
@keyframes entra-echo{to{opacity:.28}}

/* ────────────────────────── Adaptación a pantallas ────────────────────────── */

@media (max-width:1080px){
  .hd__nav{display:none}
  .hd__burger{display:flex}
  .hero__foot{grid-template-columns:1fr;align-items:start;gap:28px}
  /* El corte deja de flotar y pasa a ser una pieza más de la portada. */
  .hero__art{
    position:static;width:min(78%,360px);
    margin:clamp(30px,5vw,44px) auto 0;opacity:.45;
  }
}

@media (max-width:860px){
  body{font-size:16.5px}
  .grid3,.frentes,.valores,.cont{grid-template-columns:1fr}
  .valores{border-radius:var(--r)}
  .facts{grid-template-columns:repeat(2,1fr)}
  .ft__in{grid-template-columns:1fr}
  .ft__cols{grid-template-columns:repeat(2,1fr)}
  .mision{max-width:none}
  .frente__art{max-width:200px}
}

@media (max-width:640px){
  .fld-row{grid-template-columns:1fr}
  .facts{grid-template-columns:1fr}
  .btn{width:100%}
  .hero__cta,.cont__btns{flex-direction:column;align-items:stretch}
  .hd__act .btn{width:auto}
  .mirror__echo{height:clamp(26px,7vw,44px)}
  .marca__linea img{min-width:900px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;animation-delay:0s !important;
    transition-duration:.001ms !important;
  }
  .js .reveal{opacity:1;transform:none}
  .js .mirror__rule,.js .seam__rule{transform:scaleX(1)}
  .js .seam__iso{opacity:.9}
  .js .hero__iso,.js .hero__eb,.js .hero__h1,.js .hero__foot{opacity:1;transform:none}
  .js .mirror__echo{opacity:.28}
  .js .hero__art{opacity:.45;transform:none}
}

@media print{
  .hd,.toast,.hero__cta,.cont__form{display:none}
  .band--roca{background:#fff;color:#000}
}