/* ============================================================
   21 CONVIVENCIAS — Estilo minimalista B/N, tipografía de palo seco
   ============================================================ */

:root{
  --black:#0a0a0a;
  --white:#ffffff;
  --gray-1:#f4f4f4;
  --gray-2:#d9d9d9;
  --gray-3:#8c8c8c;
  --font: "Helvetica Neue", Helvetica, Arial, "Segoe UI", sans-serif;
  --maxw: 1180px;
  --speed: .35s;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font);
  color:var(--black);
  background:var(--white);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul,ol{ margin:0; padding:0; }
h1,h2,h3{ font-weight:700; letter-spacing:-0.01em; margin:0 0 .5em; }
p{ margin:0 0 1em; }

.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 28px; }

.skip-link{
  position:absolute; left:-999px; top:0; background:var(--black); color:var(--white);
  padding:10px 16px; z-index:999;
}
.skip-link:focus{ left:12px; top:12px; }

/* ===== HEADER ===== */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--gray-2);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  height:74px;
}
.logo{
  font-size:1.15rem; font-weight:700; letter-spacing:.04em; text-transform:uppercase;
}
.logo span{ font-weight:300; margin-left:.25em; }
.main-nav{ display:flex; gap:32px; }
.main-nav a{
  font-size:.85rem; text-transform:uppercase; letter-spacing:.08em;
  padding:6px 0; border-bottom:1px solid transparent;
  transition:border-color var(--speed);
}
.main-nav a:hover, .main-nav a:focus-visible{ border-color:var(--black); }

.menu-toggle{
  display:none; flex-direction:column; justify-content:center; gap:5px;
  width:32px; height:32px; background:none; border:none; cursor:pointer; padding:0;
}
.menu-toggle span{ display:block; height:2px; width:100%; background:var(--black); }

/* ===== HERO ===== */
.hero{
  position:relative; height:100vh; min-height:560px; overflow:hidden;
  display:flex; align-items:flex-end;
  color:var(--white);
}
.hero-slides{ position:absolute; inset:0; }
.slide{
  position:absolute; inset:0;
  background-size:cover; background-position:center;
  opacity:0; transition:opacity 1.2s ease;
}
.slide.is-active{ opacity:1; }
.slide-overlay{
  position:absolute; inset:0;
  background:linear-gradient(180deg, rgba(10,10,10,.35) 0%, rgba(10,10,10,.15) 35%, rgba(10,10,10,.85) 100%);
  filter:grayscale(100%);
}
.hero-content{
  position:relative; z-index:2; padding-bottom:110px; padding-top:140px;
}
.hero-eyebrow{
  text-transform:uppercase; letter-spacing:.25em; font-size:.75rem;
  margin-bottom:18px; opacity:.85;
}
.hero-title{
  font-size:clamp(2rem, 5vw, 3.6rem);
  font-weight:700; max-width:880px; min-height:1.3em;
}
.hero-title .line{
  display:inline-block; opacity:0; transform:translateY(18px);
  animation: heroLineIn .9s ease forwards;
}
@keyframes heroLineIn{
  to{ opacity:1; transform:translateY(0); }
}
.hero-sub{
  max-width:560px; font-size:1.05rem; opacity:.9; margin-top:18px;
}
.hero-actions{ display:flex; gap:16px; margin-top:32px; flex-wrap:wrap; }

.btn{
  display:inline-block; padding:14px 30px; font-size:.85rem;
  text-transform:uppercase; letter-spacing:.08em; font-weight:700;
  border:1px solid currentColor; transition:background var(--speed), color var(--speed);
}
.btn-primary{ background:var(--white); color:var(--black); }
.btn-primary:hover{ background:transparent; color:var(--white); }
.hero .btn-primary{ border-color:var(--white); }
.btn-ghost{ background:transparent; color:var(--white); border-color:rgba(255,255,255,.6); }
.btn-ghost:hover{ background:var(--white); color:var(--black); }

.section .btn-primary{ background:var(--black); color:var(--white); border-color:var(--black); }
.section .btn-primary:hover{ background:var(--white); color:var(--black); }
.section .btn-ghost{ color:var(--black); border-color:var(--black); }
.section .btn-ghost:hover{ background:var(--black); color:var(--white); }

.hero-dots{
  position:absolute; right:28px; bottom:48px; z-index:2;
  display:flex; gap:10px;
}
.dot{
  width:10px; height:10px; border-radius:50%; border:1px solid var(--white);
  background:transparent; cursor:pointer; padding:0;
}
.dot.is-active{ background:var(--white); }

.hero-caption{
  position:absolute; left:28px; bottom:48px; z-index:2;
  font-size:.75rem; text-transform:uppercase; letter-spacing:.2em; opacity:.8;
}

/* ===== SECTION GENERIC ===== */
.section{ padding:96px 0; }
.section.alt{ background:var(--gray-1); }
.eyebrow{
  text-transform:uppercase; letter-spacing:.2em; font-size:.78rem; color:var(--gray-3);
  margin-bottom:14px;
}
.section h2{ font-size:clamp(1.6rem,3vw,2.4rem); max-width:760px; }
.lead{ max-width:640px; font-size:1.05rem; color:#333; }

/* ===== STEPS ===== */
.steps-grid{
  list-style:none; display:grid; grid-template-columns:repeat(4,1fr); gap:36px 28px;
  margin-top:48px; counter-reset:none;
}
.step img{ width:64px; height:auto; margin-bottom:16px; filter:grayscale(100%); }
.step h3{ font-size:1rem; text-transform:uppercase; letter-spacing:.05em; }
.step p{ font-size:.92rem; color:#333; }

.fold-gif{ text-align:center; margin-top:64px; }
.fold-gif img{ max-width:420px; margin:0 auto; border:1px solid var(--gray-2); }
.fold-gif figcaption{ margin-top:14px; font-size:.85rem; color:var(--gray-3); text-transform:uppercase; letter-spacing:.1em; }

/* ===== DOWNLOAD BLOCKS ===== */
.download-block{
  display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center;
  padding:48px 0; border-bottom:1px solid var(--gray-2);
}
.download-block:last-child{ border-bottom:none; }
.download-block.reverse{ direction:rtl; }
.download-block.reverse > *{ direction:ltr; }
.download-media img{ filter:grayscale(100%); width:100%; height:auto; aspect-ratio:4/5; object-fit:cover; }
.download-text h2{ margin-bottom:14px; }
.download-actions{ display:flex; gap:16px; margin-top:24px; flex-wrap:wrap; }

/* ===== ABOUT ===== */
.about-grid{
  display:grid; grid-template-columns:1.1fr .9fr; gap:64px; align-items:center;
}
.about-media img{ filter:grayscale(100%); border:1px solid var(--gray-2); }

/* ===== LIST SECTIONS (reglas numeradas) ===== */
.list-grid{
  display:grid; grid-template-columns:.85fr 1.15fr; gap:64px; align-items:start;
}
.list-grid.reverse{ grid-template-columns:1.15fr .85fr; }
.list-grid.reverse .list-media{ order:2; }
.list-media img{ filter:grayscale(100%); width:100%; height:auto; position:sticky; top:110px; }
.rules-list{
  list-style:none; counter-reset:rule;
  display:flex; flex-direction:column; gap:18px;
}
.rules-list li{
  counter-increment:rule;
  position:relative; padding-left:42px; font-size:.97rem; color:#222;
}
.rules-list li::before{
  content:counter(rule);
  position:absolute; left:0; top:0;
  font-weight:700; font-size:.85rem;
  width:28px; height:28px; border:1px solid var(--black);
  display:flex; align-items:center; justify-content:center;
}

/* ===== CREDITS ===== */
.credits{ background:var(--black); color:var(--white); }
.credits-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:48px;
}
.credits h3{
  text-transform:uppercase; letter-spacing:.15em; font-size:.85rem; margin-bottom:18px; color:var(--gray-2);
}
.credits ul{ list-style:none; display:flex; flex-direction:column; gap:8px; font-size:.92rem; }
.credits p{ font-size:.92rem; color:var(--gray-2); }

/* ===== FOOTER ===== */
.site-footer{ padding:48px 0; border-top:1px solid var(--gray-2); }
.footer-inner{ display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:16px; }
.footer-link{ text-transform:uppercase; letter-spacing:.08em; font-size:.85rem; border-bottom:1px solid var(--black); }

/* ===== WHATSAPP FLOTANTE ===== */
.whatsapp-btn{
  position:fixed; right:24px; bottom:24px; z-index:200;
  background:var(--black); color:var(--white);
  width:58px; height:58px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 6px 20px rgba(0,0,0,.3);
  transition:width var(--speed), border-radius var(--speed), padding var(--speed);
  overflow:hidden; white-space:nowrap;
}
.whatsapp-label{
  max-width:0; opacity:0; margin-left:0; font-size:.85rem; font-weight:700;
  text-transform:uppercase; letter-spacing:.05em;
  transition:max-width var(--speed), opacity var(--speed), margin var(--speed);
}
.whatsapp-btn:hover{ width:auto; padding:0 22px; border-radius:30px; }
.whatsapp-btn:hover .whatsapp-label{ max-width:140px; opacity:1; margin-left:10px; }

/* ===== RESPONSIVE ===== */
@media (max-width:980px){
  .main-nav{ display:none; }
  .menu-toggle{ display:flex; }
  .steps-grid{ grid-template-columns:repeat(2,1fr); }
  .download-block, .about-grid, .list-grid, .list-grid.reverse{
    grid-template-columns:1fr; gap:32px;
  }
  .download-block.reverse{ direction:ltr; }
  .list-grid.reverse .list-media{ order:0; }
  .list-media img{ position:static; }
  .credits-grid{ grid-template-columns:1fr; }
}
@media (max-width:600px){
  .steps-grid{ grid-template-columns:1fr 1fr; }
  .hero-content{ padding-bottom:80px; padding-top:120px; }
  .section{ padding:64px 0; }
}

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.01ms !important; animation-iteration-count:1 !important; transition-duration:0.01ms !important; scroll-behavior:auto !important; }
}