:root{
  --bg:#0b1210;
  --surface:#0f1714;
  --primary:#0f6d4e;
  --primary-2:#0a4a36;
  --text:#e8f3ee;
  --muted:#b3c7bf;
  --shadow:0 20px 40px rgba(0,0,0,.35);
}

/* Base */
*{box-sizing:border-box}
html,body{height:100%}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,Helvetica,sans-serif;
  color:var(--text);
  background-color:var(--bg);
  /* Fondo sin “seams”: sólo radiales suaves, sin linear-steps */
  background-image:
    radial-gradient(1200px 780px at 10% -16%,
      rgba(15,109,78,.12) 0%,
      rgba(15,109,78,.06) 40%,
      rgba(15,109,78,0) 74%),
    radial-gradient(1200px 820px at 110% 12%,
      rgba(10,74,54,.14) 0%,
      rgba(10,74,54,.06) 42%,
      rgba(10,74,54,0) 78%);
  background-repeat:no-repeat;
  line-height:1.6;
  padding-top:64px; /* compensa header fijo */
}

/* Layout */
.container{width:min(1120px,94%); margin:0 auto}
section{padding:48px 0; scroll-margin-top:88px;}
h2{font-size:clamp(22px,3.4vw,32px); margin:0 0 18px}

/* Header */
.nav{
  position:fixed; top:0; left:0; right:0; z-index:1000;
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:14px min(3vw,24px);
  background:rgba(11,18,16,.88);
  -webkit-backdrop-filter:saturate(1.1) blur(6px);
  backdrop-filter:saturate(1.1) blur(6px);
  border-bottom:1px solid rgba(255,255,255,.06);
  box-shadow:0 1px 0 rgba(255,255,255,.04);
}
.nav a{color:var(--text); text-decoration:none; margin:0 10px; opacity:.9}
.nav a:hover{opacity:1}
.brand{font-weight:800; letter-spacing:.5px; font-size:20px}
.brand .dot{color:var(--primary)}

@media (max-width:560px){
  .nav{padding:10px 12px; row-gap:8px}
  .brand{order:1; font-size:18px}
  .nav nav{
    order:2; width:100%;
    display:flex; flex-wrap:wrap; gap:8px;
    justify-content:space-between; align-items:center;
  }
  .nav a{margin:0 6px; font-size:15px}
}

/* Botones */
.btn{
  display:inline-block;
  background:linear-gradient(180deg,#108b64,#0f6d4e);
  color:#fff; padding:10px 16px; border-radius:14px;
  font-weight:600; text-decoration:none;
  border:1px solid rgba(12,180,120,.28);
  box-shadow:0 10px 24px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.12);
  transition:transform .2s ease, filter .2s ease;
  outline:none; -webkit-appearance:none; appearance:none;
}
.btn:hover{filter:saturate(1.05); transform:translateY(-1px)}
.btn:active{transform:translateY(0); box-shadow:0 6px 16px rgba(0,0,0,.35), inset 0 2px 0 rgba(0,0,0,.15)}
.btn--ghost{background:transparent; outline:1px solid rgba(255,255,255,.18)}
.btn--ghost:hover{background:rgba(255,255,255,.06)}
.btn:focus-visible{
  box-shadow:0 0 0 3px rgba(16,137,105,.35), 0 10px 24px rgba(0,0,0,.35), inset 0 1px 0 rgba(255,255,255,.12);
}

/* Hero */
.hero{display:grid; grid-template-columns:1.2fr .8fr; gap:40px; padding:72px 0 36px}
.hero h1{font-size:clamp(28px,5vw,44px); line-height:1.1; margin:0 0 12px}
.hero .accent{background:linear-gradient(90deg,#d8fff3,#9be7c9); -webkit-background-clip:text; color:transparent}
.hero p{color:var(--muted); margin:0 0 18px}
.hero .cta{display:flex; gap:12px; margin:10px 0 14px}
.badges{display:flex; gap:16px; flex-wrap:wrap; padding:0; margin:18px 0 0; list-style:none}
.badges li{padding:6px 10px; border-radius:999px; background:rgba(255,255,255,.06); color:#d6efe5; font-size:14px}
.hero__vis{display:grid; place-items:center}
.glass{
  backdrop-filter:blur(12px) saturate(1.1);
  background:linear-gradient(180deg,rgba(255,255,255,.08),rgba(255,255,255,.04));
  border:1px solid rgba(255,255,255,.12);
  border-radius:18px; padding:22px; box-shadow:var(--shadow);
}

/* Grid de tarjetas */
.grid{display:grid; grid-template-columns:repeat(3,1fr); gap:18px}
.grid .card{background:var(--surface)}
.card{padding:22px; border-radius:18px; box-shadow:0 16px 40px rgba(0,0,0,.35)}
.grid .card h3{margin:0 0 8px}
.grid .card p{color:var(--muted)}

@media (max-width:900px){
  .hero{grid-template-columns:1fr}
  .grid{grid-template-columns:1fr; gap:12px}
}

/* Chat custom */
.chatbox{
  position:relative;
  background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.02));
  border:1px solid rgba(12,180,120,.16);
  border-radius:18px;
  padding:12px;
  display:grid; grid-template-rows:1fr auto auto; gap:10px;
  min-height:420px;
  box-shadow:0 16px 40px rgba(0,0,0,.35);
}
.messages{
  overflow:auto; padding:6px;
  display:grid; gap:10px; align-content:start;
  max-height:560px; scroll-behavior:smooth;
}
.bubble{
  padding:10px 12px; border-radius:14px; line-height:1.45;
  width:fit-content; max-width:min(720px,92%);
  word-wrap:break-word; box-shadow:0 6px 14px rgba(0,0,0,.18);
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.bubble--user{
  margin-left:auto;
  background:linear-gradient(180deg,rgba(255,255,255,.10),rgba(255,255,255,.06));
  border:1px solid rgba(255,255,255,.14);
  box-shadow:0 8px 18px rgba(0,0,0,.25), inset 0 1px 0 rgba(255,255,255,.06);
}
.bubble--bot{
  background:linear-gradient(180deg,#0f1f19,#0c1914);
  border:1px solid rgba(12,180,120,.28);
  box-shadow:0 8px 18px rgba(0,0,0,.28), inset 0 1px 0 rgba(255,255,255,.04);
}
.bubble--typing{display:inline-flex; gap:6px; align-items:center}
.dot-typing{width:6px; height:6px; border-radius:50%; background:#cfece2; opacity:.8; animation:blink 1.2s infinite ease-in-out}
.dot-typing:nth-child(2){animation-delay:.15s}
.dot-typing:nth-child(3){animation-delay:.3s}
@keyframes blink{0%,80%,100%{opacity:.2} 40%{opacity:1}}

.chatinput{display:grid; grid-template-columns:1fr auto; gap:8px}
.chatinput input{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.04));
  color:var(--text);
  border:1px solid rgba(255,255,255,.10);
  border-radius:14px; padding:12px 14px; outline:none;
}

@media (max-width:900px){
  .messages{max-height:460px}
}

/* Formulario */
.form{display:grid; gap:12px; max-width:720px}
.row{display:grid; grid-template-columns:1fr 1fr; gap:12px}
input,textarea{
  width:100%; background:rgba(255,255,255,.06); color:var(--text);
  border:1px solid rgba(255,255,255,.12); border-radius:14px; padding:12px 14px; outline:none;
}
textarea{min-height:140px; resize:vertical}
input::placeholder,textarea::placeholder{color:#c9ded6}
.form__status{margin:8px 4px 0; color:#cfece2; min-height:1.4em}

/* Footer */
.footer{
  padding:36px 0 64px; color:#b7cec5; font-size:14px;
  border-top:1px solid rgba(255,255,255,.06); text-align:left;
}

/* Animaciones */
.reveal{opacity:0; transform:translateY(10px); transition:opacity .6s ease, transform .6s ease}
.reveal--visible{opacity:1; transform:none}
@media (prefers-reduced-motion:reduce){
  .reveal,.btn{transition:none}
}