/* ==========================================================================
   LIFF TECHNOLOGY — Landing Page
   Hoja de estilos principal
   ========================================================================== */

:root{
  --paper:#EEF1F5;
  --paper-line:#c9d3e0;
  --ink:#101d33;
  --ink-soft:#3c4a63;
  --blueprint:#1c4f95;
  --blueprint-soft:#e7edf7;
  --brass:#bd7a34;
  --brass-dark:#9a611f;
  --signal:#37a066;
  --panel-dark:#0e1626;
  --panel-dark-2:#142138;
  --max:1180px;
}
*{box-sizing:border-box; margin:0; padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--paper);
  color:var(--ink);
  font-family:'IBM Plex Sans', sans-serif;
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block; max-width:100%;}
a{color:inherit; text-decoration:none;}
.wrap{max-width:var(--max); margin:0 auto; padding:0 32px;}
h1,h2,h3{font-family:'Space Grotesk', sans-serif; letter-spacing:-0.01em;}
.mono{font-family:'IBM Plex Mono', monospace;}
.eyebrow{
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--blueprint);
  display:flex; align-items:center; gap:10px;
}
.eyebrow::before{
  content:"";
  width:22px; height:1px;
  background:var(--blueprint);
  display:inline-block;
}

/* blueprint grid background */
.grid-bg{
  background-image:
    linear-gradient(var(--paper-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px);
  background-size:44px 44px;
  background-position:-1px -1px;
}
.crosshair{position:absolute; width:14px; height:14px; pointer-events:none;}
.crosshair::before, .crosshair::after{content:""; position:absolute; background:var(--blueprint);}
.crosshair::before{width:100%; height:1px; top:50%;}
.crosshair::after{width:1px; height:100%; left:50%;}

/* ---------- header ---------- */
header{
  position:sticky; top:0; z-index:50;
  background:rgba(238,241,245,0.88);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--paper-line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:18px 32px;
  max-width:var(--max); margin:0 auto;
}
.logo{
  display:flex; align-items:center; gap:10px;
  font-family:'Space Grotesk', sans-serif;
  font-weight:700; font-size:19px; letter-spacing:-0.01em;
}
.logo .dot{
  width:9px; height:9px; border-radius:50%;
  background:var(--signal);
  box-shadow:0 0 0 3px rgba(55,160,102,0.18);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{box-shadow:0 0 0 3px rgba(55,160,102,0.18);}
  50%{box-shadow:0 0 0 6px rgba(55,160,102,0.06);}
}
.nav-links{display:flex; gap:34px; font-size:14.5px; color:var(--ink-soft);}
.nav-links a{transition:color .15s;}
.nav-links a:hover{color:var(--blueprint);}
.nav-cta{
  font-family:'IBM Plex Mono', monospace;
  font-size:13px; letter-spacing:0.03em;
  background:var(--ink);
  color:var(--paper);
  padding:10px 18px;
  border-radius:2px;
  border:1px solid var(--ink);
  transition:background .15s, color .15s;
}
.nav-cta:hover{background:transparent; color:var(--ink);}
@media (max-width:820px){ .nav-links{display:none;} }

/* ---------- hero ---------- */
.hero{position:relative; overflow:hidden; padding:88px 0 60px;}
.hero .wrap{position:relative;}
.hero-grid{
  display:grid; grid-template-columns:1.05fr 0.95fr; gap:56px; align-items:center;
}
.hero h1{
  font-size:clamp(34px, 4.6vw, 58px);
  line-height:1.05;
  margin:18px 0 22px;
  color:var(--ink);
}
.hero h1 em{
  font-style:normal;
  color:var(--blueprint);
}
.hero p.lead{
  font-size:17.5px;
  color:var(--ink-soft);
  max-width:480px;
  margin-bottom:34px;
}
.cta-row{display:flex; gap:14px; flex-wrap:wrap;}
.btn-primary{
  background:var(--brass);
  color:#fff;
  font-family:'IBM Plex Mono', monospace;
  font-size:13.5px; letter-spacing:0.03em;
  padding:15px 26px;
  border-radius:2px;
  border:1px solid var(--brass);
  transition:background .15s, transform .15s;
  display:inline-block;
}
.btn-primary:hover{background:var(--brass-dark); transform:translateY(-1px);}
.btn-secondary{
  font-family:'IBM Plex Mono', monospace;
  font-size:13.5px; letter-spacing:0.03em;
  padding:15px 22px;
  border-radius:2px;
  border:1px solid var(--ink);
  color:var(--ink);
  transition:background .15s, color .15s;
  display:inline-block;
}
.btn-secondary:hover{background:var(--ink); color:var(--paper);}

/* schematic diagram */
.schematic{
  position:relative;
  background:#fff;
  border:1px solid var(--paper-line);
  border-radius:4px;
  padding:22px;
}
.schematic-head{
  display:flex; justify-content:space-between; align-items:center;
  font-family:'IBM Plex Mono', monospace;
  font-size:11.5px; letter-spacing:0.08em;
  color:var(--ink-soft);
  text-transform:uppercase;
  margin-bottom:14px;
  padding-bottom:12px;
  border-bottom:1px dashed var(--paper-line);
}
.schematic-head .status{display:flex; align-items:center; gap:7px; color:var(--signal);}
.schematic-head .status .d{width:6px; height:6px; border-radius:50%; background:var(--signal); animation:pulse 2.4s ease-in-out infinite;}

.zone-label{
  font-family:'IBM Plex Mono', monospace;
  font-size:10.5px;
  fill:var(--ink-soft);
  letter-spacing:0.05em;
}

/* ---------- section shared ---------- */
section{padding:88px 0;}
.section-head{max-width:640px; margin-bottom:52px;}
.section-head h2{
  font-size:clamp(26px, 3.2vw, 38px);
  margin:16px 0 14px;
  line-height:1.15;
}
.section-head p{color:var(--ink-soft); font-size:16px;}

/* ---------- interest ---------- */
.problems{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:1px;
  background:var(--paper-line);
  border:1px solid var(--paper-line);
  margin-bottom:64px;
}
.problem{
  background:var(--paper);
  padding:28px 26px;
}
.problem .tag{
  font-family:'IBM Plex Mono', monospace;
  font-size:11px; color:var(--blueprint);
  letter-spacing:0.08em;
}
.problem h3{font-size:17px; margin:12px 0 8px; font-weight:600;}
.problem p{font-size:14.5px; color:var(--ink-soft);}
@media (max-width:820px){ .problems{grid-template-columns:1fr;} }

.audience{
  display:grid; grid-template-columns:1fr 1fr; gap:24px;
}
.zone-card{
  position:relative;
  border:1px solid var(--ink);
  padding:30px 28px 28px;
  background:#fff;
}
.zone-card .zone-tag{
  position:absolute; top:-1px; left:-1px;
  background:var(--ink);
  color:var(--paper);
  font-family:'IBM Plex Mono', monospace;
  font-size:11px; letter-spacing:0.08em;
  padding:6px 12px;
}
.zone-card h3{font-size:21px; margin:26px 0 12px;}
.zone-card ul{list-style:none; margin-top:14px;}
.zone-card li{
  font-size:14.5px; color:var(--ink-soft);
  padding:9px 0 9px 20px;
  border-top:1px solid var(--paper-line);
  position:relative;
}
.zone-card li:first-child{border-top:none;}
.zone-card li::before{
  content:"→";
  position:absolute; left:0; color:var(--blueprint);
}
@media (max-width:820px){ .audience{grid-template-columns:1fr;} }

/* ---------- desire / features ---------- */
.features-band{background:var(--blueprint-soft);}
.feature-grid{
  display:grid; grid-template-columns:repeat(3, 1fr); gap:1px;
  background:var(--paper-line);
  border:1px solid var(--paper-line);
}
.feature{
  background:#fff;
  padding:30px 26px;
}
.feature .code{
  font-family:'IBM Plex Mono', monospace;
  font-size:11.5px; color:var(--brass-dark);
  letter-spacing:0.06em;
  margin-bottom:14px;
  display:block;
}
.feature h3{font-size:18px; margin-bottom:9px; font-weight:600;}
.feature p{font-size:14.5px; color:var(--ink-soft);}
@media (max-width:820px){ .feature-grid{grid-template-columns:1fr;} }

/* ---------- differentiators strip ---------- */
.strip{
  border-top:1px solid var(--paper-line);
  border-bottom:1px solid var(--paper-line);
  padding:40px 0;
}
.strip .wrap{
  display:grid; grid-template-columns:repeat(3,1fr); gap:34px;
}
.strip-item{display:flex; gap:14px; align-items:flex-start;}
.strip-item .mark{
  font-family:'IBM Plex Mono', monospace;
  font-size:12px; color:var(--blueprint);
  border:1px solid var(--blueprint);
  padding:4px 7px;
  border-radius:2px;
  flex-shrink:0;
}
.strip-item p{font-size:14.5px; color:var(--ink-soft); padding-top:2px;}
@media (max-width:820px){ .strip .wrap{grid-template-columns:1fr; gap:20px;} }

/* ---------- final CTA ---------- */
.final-cta{
  background:var(--panel-dark);
  color:#eef1f5;
  position:relative;
  overflow:hidden;
}
.final-cta::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size:44px 44px;
}
.final-cta .wrap{position:relative; display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start;}
.final-cta .eyebrow{color:#7fb0f0;}
.final-cta .eyebrow::before{background:#7fb0f0;}
.final-cta h2{
  font-size:clamp(28px,3.4vw,40px);
  margin:16px 0 18px;
  line-height:1.12;
  color:#fff;
}
.final-cta p.lead{color:#b7c0d1; font-size:16px; max-width:440px; margin-bottom:28px;}
.final-cta .btn-primary{font-size:14px;}

.form-card{
  background:var(--panel-dark-2);
  border:1px solid rgba(255,255,255,0.09);
  padding:30px;
  border-radius:3px;
}
.form-card .mono{font-size:11px; letter-spacing:0.1em; color:#7fb0f0; text-transform:uppercase; display:block; margin-bottom:20px;}
.field{margin-bottom:16px;}
.field label{
  display:block; font-size:12.5px; color:#8b96ac;
  margin-bottom:7px; font-family:'IBM Plex Mono', monospace;
}
.field input, .field select, .field textarea{
  width:100%;
  background:rgba(255,255,255,0.04);
  border:1px solid rgba(255,255,255,0.14);
  color:#eef1f5;
  padding:11px 13px;
  font-family:'IBM Plex Sans', sans-serif;
  font-size:14.5px;
  border-radius:2px;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:2px solid #7fb0f0; outline-offset:1px;
  border-color:transparent;
}
.field textarea{resize:vertical; min-height:80px;}

/* estados del envío (usados por script.js) */
.form-submit{
  width:100%;
  background:var(--brass);
  color:#fff;
  font-family:'IBM Plex Mono', monospace;
  font-size:13.5px; letter-spacing:0.03em;
  padding:14px;
  border:none; border-radius:2px;
  cursor:pointer;
  transition:background .15s;
  margin-top:6px;
}
.form-submit:hover{background:var(--brass-dark);}
.form-submit:disabled{opacity:0.6; cursor:not-allowed;}
.form-note{font-size:12px; color:#7c869c; margin-top:12px; text-align:center;}

.form-feedback{
  display:none;
  font-family:'IBM Plex Mono', monospace;
  font-size:12.5px;
  padding:11px 13px;
  border-radius:2px;
  margin-top:14px;
}
.form-feedback.show{display:block;}
.form-feedback.success{background:rgba(55,160,102,0.12); border:1px solid rgba(55,160,102,0.4); color:#7fd6a0;}
.form-feedback.error{background:rgba(214,80,80,0.12); border:1px solid rgba(214,80,80,0.4); color:#e69b9b;}

.field.invalid input,
.field.invalid select,
.field.invalid textarea{
  border-color:#d65050;
}
.field-error{
  display:none;
  font-size:11.5px;
  color:#e69b9b;
  margin-top:6px;
  font-family:'IBM Plex Mono', monospace;
}
.field.invalid .field-error{display:block;}

@media (max-width:820px){ .final-cta .wrap{grid-template-columns:1fr;} }

/* ---------- footer ---------- */
footer{padding:36px 0; border-top:1px solid var(--paper-line);}
footer .wrap{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px;}
footer .logo{font-size:15px;}
footer .foot-links{display:flex; gap:22px; font-size:13px; color:var(--ink-soft);}
footer .copy{font-family:'IBM Plex Mono', monospace; font-size:11.5px; color:var(--ink-soft);}

/* ---------- back to top ---------- */
.back-to-top{
  position:fixed;
  right:22px; bottom:22px;
  width:42px; height:42px;
  background:var(--ink);
  color:var(--paper);
  border:none;
  border-radius:2px;
  font-family:'IBM Plex Mono', monospace;
  font-size:16px;
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transform:translateY(8px);
  transition:opacity .2s, transform .2s;
  z-index:60;
}
.back-to-top.show{opacity:1; pointer-events:auto; transform:translateY(0);}
.back-to-top:hover{background:var(--blueprint);}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

/* ---------- mobile menu ---------- */
.menu-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  background:none;
  border:none;
  cursor:pointer;
  padding:6px;
}
.menu-toggle span{
  width:22px; height:2px;
  background:var(--ink);
  display:block;
  transition:transform .2s, opacity .2s;
}
.menu-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.menu-toggle.open span:nth-child(2){opacity:0;}
.menu-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

@media (max-width:820px){
  .menu-toggle{display:flex;}
  .nav-links{
    display:flex;
    flex-direction:column;
    gap:0;
    position:absolute;
    top:100%; left:0; right:0;
    background:var(--paper);
    border-bottom:1px solid var(--paper-line);
    max-height:0;
    overflow:hidden;
    transition:max-height .25s ease;
  }
  .nav-links.open{max-height:280px;}
  .nav-links a{padding:16px 32px; border-top:1px solid var(--paper-line);}
}