/* ============================================================
   ECHO — Inteligencia Ambiental en Tiempo Real
   Sitio corporativo · echoambiente.com
   ============================================================ */
:root{
  --teal:#0d4d4d;
  --teal-deep:#083330;
  --teal-mid:#137a7a;
  --aqua:#4fb3c9;
  --aqua-soft:#bfe6ea;
  --leaf:#7cb342;
  --leaf-dark:#4f8f2a;
  --gold:#c9a227;
  --ink:#12241f;
  --muted:#5b7069;
  --line:#dbe7e2;
  --bg:#f5f8f6;
  --bg-2:#eef4f1;
  --white:#fff;
  --shadow:0 18px 44px rgba(8,51,48,.12);
  --shadow-sm:0 8px 22px rgba(8,51,48,.08);
  --radius:18px;
  --radius-sm:12px;
  --max:1180px;
  --ff:"Segoe UI",Roboto,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--ff);color:var(--ink);background:var(--white);
  line-height:1.65;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.18;font-weight:800;color:var(--teal-deep)}
p{margin:0 0 1rem}
ul{margin:0 0 1rem;padding-left:1.2rem}
li{margin:.25rem 0}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.eyebrow{font-size:.76rem;font-weight:800;letter-spacing:.18em;text-transform:uppercase;color:var(--teal-mid)}
.leading{font-size:1.12rem;color:var(--muted)}
.muted{color:var(--muted)}
.center{text-align:center}
.mt-2{margin-top:1.4rem}
.mt-3{margin-top:2.2rem}

/* ---------- Header ---------- */
header.top{
  position:sticky;top:0;z-index:60;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.top .wrap{display:flex;align-items:center;gap:18px;height:74px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand img{height:38px;width:auto}
.brand small{display:block;font-size:.66rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);font-weight:700}
.nav{display:flex;align-items:center;gap:2px;margin-left:auto}
.nav a{padding:.55rem .8rem;border-radius:9px;font-weight:600;font-size:.92rem;color:var(--ink);white-space:nowrap}
.nav a:hover{background:var(--bg-2);color:var(--teal)}
.btn{
  display:inline-flex;align-items:center;gap:9px;font:inherit;font-size:.92rem;font-weight:700;cursor:pointer;
  padding:.72rem 1.15rem;border-radius:11px;border:1px solid transparent;transition:.18s;line-height:1;text-decoration:none;
}
.btn svg{width:17px;height:17px}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-deep)}
.btn-accent{background:var(--leaf);color:#fff}
.btn-accent:hover{background:var(--leaf-dark)}
.btn-ghost{border-color:var(--line);background:#fff;color:var(--teal)}
.btn-ghost:hover{border-color:var(--teal);background:var(--bg-2)}
.btn-light{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.35)}
.btn-light:hover{background:rgba(255,255,255,.26)}
.top .btn{margin-left:6px}
.burger{display:none;margin-left:auto;background:none;border:0;cursor:pointer;padding:10px}
.burger span{display:block;width:24px;height:3px;border-radius:2px;background:var(--teal-deep);margin:5px 0}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--teal-deep);color:#eaf6f3}
.hero-bg{position:absolute;inset:0;z-index:0}
.hero-bg .hg{position:absolute;inset:0;background-size:cover;background-position:center;
  opacity:0;transition:opacity 1.4s ease;transform:scale(1.04)}
.hero-bg .hg.active{opacity:1}
.hero-veil{position:absolute;inset:0;z-index:1;background:
  linear-gradient(90deg, rgba(6,32,30,.92) 0%, rgba(6,32,30,.72) 34%, rgba(6,32,30,.26) 60%, rgba(6,32,30,.42) 100%)}
.hero .wrap{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;padding:78px 22px 86px}
.hero h1{font-size:clamp(2.1rem,4.2vw,3.5rem);color:#fff;text-shadow:0 2px 22px rgba(0,0,0,.25)}
.hero h1 .em{color:var(--aqua-soft)}
.hero p.lead{font-size:1.15rem;color:#d3e6e1;max-width:560px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.hero .eyebrow{color:var(--aqua-soft)}
.hero-media{position:relative}
.hero-media img{border-radius:22px;box-shadow:var(--shadow);width:100%}
.hero-badge{position:absolute;left:-18px;bottom:26px;background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:12px 16px;box-shadow:var(--shadow-sm);display:flex;align-items:center;gap:12px}
.hero-badge b{display:block;color:var(--teal);font-size:1.05rem;line-height:1}
.hero-badge span{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.08em}
.dot{width:10px;height:10px;border-radius:50%;background:var(--leaf);box-shadow:0 0 0 4px rgba(124,179,66,.2);flex:0 0 auto}

/* audio pill */
.audio-card{margin-top:20px;display:flex;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);
  border-radius:14px;padding:12px 16px;max-width:460px;box-shadow:var(--shadow-sm)}
.audio-card button{width:44px;height:44px;border-radius:50%;border:0;background:var(--teal);color:#fff;cursor:pointer;
  display:grid;place-items:center;flex:0 0 auto;transition:.18s}
.audio-card button:hover{background:var(--teal-deep)}
.audio-card button svg{width:18px;height:18px}
.audio-card .info{flex:1;min-width:0}
.audio-card .t{font-size:.86rem;font-weight:700;color:var(--teal-deep)}
.audio-card input{width:100%;accent-color:var(--teal-mid);cursor:pointer;margin-top:4px}
.audio-card .time{font-size:.74rem;color:var(--muted);font-variant-numeric:tabular-nums;flex:0 0 auto}
.guion{margin-top:14px;max-width:560px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 16px;box-shadow:var(--shadow-sm)}
.guion summary{cursor:pointer;font-weight:700;color:var(--teal-deep);font-size:.92rem}
.guion p{font-size:.92rem;color:var(--muted);margin:.6rem 0 0}

/* ---------- Stats ---------- */
.stats{background:var(--teal);color:#eaf5f2}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:30px 22px}
.stat b{display:block;font-size:2rem;color:#fff;line-height:1}
.stat span{font-size:.82rem;opacity:.85}
.stat .ic{color:var(--aqua)}

/* ---------- Sections ---------- */
section{padding:74px 0}
.sec-head{max-width:760px;margin:0 auto 42px}
.sec-head.center{text-align:center}
.sec-head h2{font-size:clamp(1.6rem,2.9vw,2.4rem)}
.sec-head p{font-size:1.05rem;color:var(--muted)}
.alt{background:var(--bg)}
.alt2{background:linear-gradient(180deg,#fbfdfc,#eef4f1)}

.grid{display:grid;gap:20px}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm);transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.card h3{font-size:1.12rem;margin-bottom:.35rem}
.card p{color:var(--muted);font-size:.95rem;margin:0}
.ic-box{width:48px;height:48px;border-radius:12px;background:var(--bg-2);color:var(--teal-mid);display:grid;place-items:center;margin-bottom:14px}
.ic-box svg{width:24px;height:24px}

/* problem cards */
.prob{border-left:4px solid var(--aqua)}
.prob .imp{display:inline-block;margin-top:10px;font-size:.8rem;font-weight:700;color:var(--teal-mid);background:var(--bg-2);
  padding:.28rem .6rem;border-radius:20px}

/* chain */
.chain{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;counter-reset:step}
.chain .step{background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);padding:18px;position:relative}
.chain .step:before{counter-increment:step;content:counter(step);display:grid;place-items:center;width:30px;height:30px;border-radius:50%;
  background:var(--teal);color:#fff;font-weight:800;font-size:.85rem;margin-bottom:10px}
.chain .step h4{margin:0 0 .3rem;font-size:.98rem}
.chain .step p{font-size:.86rem;color:var(--muted);margin:0}

/* model cards */
.model{border-top:5px solid var(--teal-mid)}
.model.water{border-top-color:var(--aqua)}
.model.air{border-top-color:#7fb2e8}
.model.land{border-top-color:var(--leaf)}
.model.hybrid{border-top-color:var(--gold)}
.model .tag{font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--teal-mid)}
.model dl{margin:12px 0 0;font-size:.88rem}
.model dt{font-weight:700;color:var(--teal-deep);margin-top:8px}
.model dd{margin:0;color:var(--muted)}

/* generic table */
.tbl{width:100%;border-collapse:collapse;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);overflow:hidden;font-size:.92rem}
.tbl th,.tbl td{padding:.72rem .95rem;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--bg-2);color:var(--teal-deep);font-weight:700}
.tbl tr:last-child td{border-bottom:0}
.tbl-wrap{overflow-x:auto;border-radius:var(--radius-sm)}
.pill{display:inline-block;font-size:.74rem;font-weight:800;padding:.2rem .6rem;border-radius:20px;background:var(--aqua-soft);color:var(--teal-deep)}

/* split feature */
.split{display:grid;grid-template-columns:1fr 1fr;gap:46px;align-items:center}
.split.rev .txt{order:2}
.split img{border-radius:var(--radius);box-shadow:var(--shadow)}
.feature-list{list-style:none;padding:0;margin:0}
.feature-list li{position:relative;padding-left:30px;margin:.55rem 0;color:var(--ink)}
.feature-list li:before{content:"";position:absolute;left:0;top:.55em;width:14px;height:14px;border-radius:50%;
  background:var(--leaf);box-shadow:0 0 0 4px rgba(124,179,66,.18)}

/* KPI row */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.kpi{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center;box-shadow:var(--shadow-sm)}
.kpi b{display:block;font-size:1.7rem;color:var(--teal-mid)}
.kpi span{font-size:.82rem;color:var(--muted)}

/* pricing */
.prices{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;align-items:stretch}
.price{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;box-shadow:var(--shadow-sm)}
.price.featured{border-color:var(--teal);box-shadow:var(--shadow);transform:translateY(-6px)}
.price .name{font-weight:800;color:var(--teal-deep);font-size:1.05rem}
.price .amt{font-size:2rem;font-weight:800;color:var(--teal);margin:.3rem 0 .1rem}
.price .amt small{font-size:.8rem;font-weight:600;color:var(--muted)}
.price ul{list-style:none;padding:0;margin:14px 0 18px;font-size:.88rem;flex:1}
.price li{padding:.35rem 0;border-bottom:1px dashed var(--line);color:var(--muted)}
.price li b{color:var(--ink)}
.price .badge{align-self:flex-start;font-size:.68rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  background:var(--leaf);color:#fff;padding:.25rem .6rem;border-radius:20px;margin-bottom:8px}

/* figures */
.figs{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.fig{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow-sm)}
.fig img{border-radius:10px}
.fig figcaption{font-size:.82rem;color:var(--muted);text-align:center;padding:10px 6px 4px}

/* team */
.team{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.person{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:center;box-shadow:var(--shadow-sm)}
.person .av{width:64px;height:64px;border-radius:50%;margin:0 auto 12px;display:grid;place-items:center;font-weight:800;color:#fff;font-size:1.3rem;
  background:linear-gradient(145deg,var(--teal-mid),var(--teal))}
.person h3{margin:0;font-size:1rem}
.person span{font-size:.82rem;color:var(--muted)}

/* roadmap */
.timeline{list-style:none;padding:0;margin:0;border-left:3px solid var(--line);margin-left:8px}
.timeline li{position:relative;padding:0 0 22px 26px}
.timeline li:before{content:"";position:absolute;left:-10px;top:4px;width:15px;height:15px;border-radius:50%;background:#fff;border:3px solid var(--teal-mid)}
.timeline b{color:var(--teal-deep)}
.timeline span{color:var(--muted);font-size:.9rem;display:block}

/* document / gallery */
.docs{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin-bottom:34px}
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:12px}
.gallery a{border:1px solid var(--line);border-radius:8px;overflow:hidden;background:#fff;box-shadow:var(--shadow-sm);transition:.18s;position:relative}
.gallery a:hover{transform:translateY(-3px);border-color:var(--teal-mid)}
.gallery img{width:100%;height:auto;display:block}
.gallery .pg{position:absolute;left:0;bottom:0;right:0;font-size:.7rem;text-align:center;background:rgba(8,51,48,.72);color:#fff;padding:2px 0}
/* lightbox */
.lb{position:fixed;inset:0;z-index:100;display:none;align-items:center;justify-content:center;background:rgba(6,26,24,.88);padding:24px}
.lb.open{display:flex}
.lb img{max-width:min(92vw,900px);max-height:88vh;border-radius:8px;box-shadow:0 30px 80px rgba(0,0,0,.5)}
.lb button{position:absolute;top:18px;right:20px;background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.3);
  border-radius:10px;padding:8px 14px;cursor:pointer;font:inherit;font-weight:700}
.lb .nav{position:absolute;top:50%;transform:translateY(-50%);font-size:1.6rem;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.3);
  color:#fff;width:48px;height:48px;border-radius:50%;cursor:pointer;display:grid;place-items:center}
.lb .prev{left:18px}.lb .next{right:18px}
.note{font-size:.82rem;color:var(--muted);text-align:center;margin-top:18px}

/* CTA band */
.band{background:linear-gradient(135deg,var(--teal) 0%,var(--teal-deep) 100%);color:#eaf5f2;border-radius:var(--radius);
  padding:44px;display:flex;align-items:center;justify-content:space-between;gap:26px;flex-wrap:wrap}
.band h2{color:#fff;margin:0 0 .3rem}
.band p{margin:0;opacity:.9}

/* footer */
footer{background:var(--teal-deep);color:#c7dcd7;padding:56px 0 26px;margin-top:0}
footer a{color:#c7dcd7}
footer a:hover{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:30px;padding-bottom:30px}
.foot-grid h4{color:#fff;font-size:.95rem;margin-bottom:.8rem}
.foot-grid ul{list-style:none;padding:0;margin:0}
.foot-grid li{margin:.35rem 0;font-size:.9rem}
.foot-brand{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.foot-brand img{height:34px;background:rgba(255,255,255,.95);border-radius:8px;padding:4px 8px}
.foot-final{border-top:1px solid rgba(255,255,255,.12);padding-top:18px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:.82rem}

/* reveal */
.reveal{opacity:0;transform:translateY(18px);transition:.6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media(max-width:1000px){
  .nav{display:none;position:absolute;top:74px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);
    flex-direction:column;align-items:stretch;padding:10px 18px 18px;gap:2px;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav a{padding:.8rem .6rem;border-bottom:1px solid var(--line)}
  .top .btn{display:none}
  .burger{display:block}
  .hero .wrap{grid-template-columns:1fr;gap:34px;padding-top:48px}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  .g-4,.prices,.team,.figs{grid-template-columns:repeat(2,1fr)}
  .chain{grid-template-columns:repeat(2,1fr)}
  .split{grid-template-columns:1fr;gap:28px}
  .split.rev .txt{order:0}
  .foot-grid{grid-template-columns:1fr 1fr}
  .price.featured{transform:none}
}
@media(max-width:620px){
  section{padding:54px 0}
  .g-2,.g-3,.g-4,.prices,.team,.figs,.kpis{grid-template-columns:1fr}
  .chain{grid-template-columns:1fr}
  .band{padding:30px;text-align:center;justify-content:center}
  .hero-badge{left:8px}
  .foot-grid{grid-template-columns:1fr}
}