/* The Engineer Tools — Engineer AI
   Identidad tomada de theengineertools.com y PetroSuite:
   fondo naval, acento cian, Space Grotesk display, JetBrains Mono en etiquetas. */

:root{
  --ink:#07111d;
  --ink2:#0b1726;
  --steel:#162538;
  --panel:#081521;
  --panel2:#0b1c2b;
  --line:#20344a;
  --line-soft:#16283b;
  --blue:#19a7e0;
  --blue2:#6dd5fa;
  --green:#2ccf91;
  --amber:#ffb547;
  --text:#edf7fb;
  --muted:#8198aa;
  --dim:#66758a;
  --radius:15px;
  --radius-lg:18px;
  --display:'Space Grotesk',system-ui,sans-serif;
  --body:'Inter',system-ui,-apple-system,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
  --maxw:1140px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--ink);color:var(--text);
  font-family:var(--body);font-size:16px;line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%}
a{color:var(--blue2);text-decoration:none}
a:hover{color:#fff}
:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:4px}
.container{width:min(var(--maxw),100%);margin:0 auto;padding:0 24px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}

/* ---------- tipografía ---------- */
h1,h2,h3{font-family:var(--display);letter-spacing:-.03em;line-height:1.06;margin:0;text-wrap:balance}
h1{font-size:clamp(2rem,4.4vw,3.05rem);font-weight:700}
h2{font-size:clamp(1.6rem,3.4vw,2.35rem);font-weight:700}
h3{font-size:1.05rem;font-weight:600;letter-spacing:-.01em;line-height:1.3}
p{margin:0 0 16px}
.eyebrow{
  font-family:var(--mono);font-size:11px;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;color:var(--blue2);
  margin:0 0 14px;display:block;
}
.lead{color:var(--muted);font-size:1.05rem;max-width:62ch}
.muted{color:var(--muted)}

/* ---------- navegación ---------- */
.site-nav{
  position:sticky;top:0;z-index:40;height:73px;display:flex;align-items:center;
  background:rgba(7,17,29,.94);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.site-nav .container{display:flex;align-items:center;gap:18px}
.wordmark{display:flex;align-items:center;gap:11px;color:var(--text)}
.wordmark .mark{
  display:grid;place-items:center;width:38px;height:38px;border-radius:11px;
  background:linear-gradient(135deg,var(--blue),#0d7fae);
  font-family:var(--display);font-weight:700;font-size:.82rem;color:#02101b;
  box-shadow:0 8px 22px rgba(25,167,224,.25);
}
.wordmark strong{font-family:var(--display);font-size:.95rem;font-weight:700;display:block;letter-spacing:-.02em}
.wordmark small{font-family:var(--mono);font-size:.6rem;letter-spacing:.14em;color:var(--dim);text-transform:uppercase}
.nav-links{margin-left:auto;display:flex;align-items:center;gap:8px}
.nav-links a{
  padding:9px 13px;border-radius:9px;font-size:.85rem;font-weight:500;color:var(--muted);
  transition:.16s ease;
}
.nav-links a:hover{background:rgba(255,255,255,.06);color:var(--text)}
.nav-links a.cta{background:var(--blue);color:#02101b;font-weight:700}
.nav-links a.cta:hover{background:var(--blue2);color:#02101b}

/* ---------- botones ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;justify-content:center;
  padding:14px 18px;border-radius:10px;border:1px solid transparent;
  font-family:var(--body);font-size:.92rem;font-weight:700;cursor:pointer;
  transition:.16s ease;min-height:48px;
}
.btn-primary{background:var(--blue);color:#02101b}
.btn-primary:hover{background:var(--blue2);color:#02101b;transform:translateY(-1px)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue2);background:rgba(25,167,224,.06)}

/* ---------- secciones ---------- */
section{padding:78px 0}
.section-head{max-width:62ch;margin-bottom:34px}
.section-head p{margin:12px 0 0;color:var(--muted)}

/* ---------- hero ---------- */
.hero{
  padding:66px 0 74px;
  background:
    radial-gradient(900px 420px at 78% -8%,rgba(25,167,224,.16),transparent 62%),
    radial-gradient(680px 340px at 6% 4%,rgba(44,207,145,.09),transparent 58%),
    var(--ink);
  border-bottom:1px solid var(--line-soft);
}
.hero-grid{display:grid;grid-template-columns:1.06fr .94fr;gap:46px;align-items:center}
.hero h1 span{color:var(--blue2)}
.hero .lead{margin:18px 0 26px;font-size:1.1rem}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px}
.hero-note{
  margin:22px 0 0;font-family:var(--mono);font-size:.72rem;color:var(--dim);
  display:flex;align-items:center;gap:8px;flex-wrap:wrap;
}
.hero-note span{flex:1 1 auto;min-width:0}
.hero-note i{flex:0 0 auto;width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 4px rgba(44,207,145,.15);font-style:normal}

/* ---------- ventana de chat de muestra ---------- */
.chat-demo{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius-lg);
  overflow:hidden;box-shadow:0 26px 70px rgba(2,10,18,.55);
}
.chat-demo header{
  display:flex;align-items:center;gap:9px;padding:12px 16px;
  border-bottom:1px solid var(--line-soft);background:var(--panel2);
}
.chat-demo header b{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:var(--muted);text-transform:uppercase;font-weight:600}
.chat-demo header .dot{width:8px;height:8px;border-radius:50%;background:var(--green)}
.chat-demo header .tag{
  margin-left:auto;font-family:var(--mono);font-size:.6rem;letter-spacing:.1em;
  color:var(--amber);border:1px solid rgba(255,181,71,.35);border-radius:20px;padding:3px 8px;
}
.chat-demo .body{padding:18px 16px;display:grid;gap:11px}
.bubble{max-width:88%;padding:11px 13px;border-radius:4px 13px 13px 13px;font-size:.87rem;line-height:1.55}
.bubble.user{align-self:flex-end;margin-left:auto;background:rgba(25,167,224,.14);border:1px solid rgba(25,167,224,.3);border-radius:13px 4px 13px 13px}
.bubble.bot{background:var(--panel2);border:1px solid var(--line-soft)}
.bubble small{
  display:block;font-family:var(--mono);font-size:.6rem;letter-spacing:.1em;
  color:var(--blue2);text-transform:uppercase;margin-bottom:6px;
}
.bubble .status{color:var(--muted);font-family:var(--mono);font-size:.74rem}
.bubble b{color:#fff}

/* ---------- pasos ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.step{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;position:relative;
}
.step .n{
  font-family:var(--mono);font-size:.68rem;font-weight:600;letter-spacing:.12em;
  color:var(--blue);display:block;margin-bottom:12px;
}
.step h3{margin-bottom:7px}
.step p{margin:0;font-size:.88rem;color:var(--muted)}

/* ---------- tarjetas de capacidad ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{
  background:transparent;border:1px solid var(--line);border-radius:var(--radius);
  padding:20px;display:flex;flex-direction:column;gap:9px;transition:.18s ease;
}
.card:hover{border-color:rgba(25,167,224,.45);background:rgba(25,167,224,.04);transform:translateY(-2px)}
.card-top{display:flex;align-items:center;justify-content:space-between;gap:10px}
.card-icon{
  display:grid;place-items:center;width:36px;height:36px;border-radius:10px;
  background:rgba(25,167,224,.12);color:var(--blue2);font-size:1rem;
}
.card-tag{font-family:var(--mono);font-size:.6rem;letter-spacing:.12em;color:var(--dim);text-transform:uppercase}
.card p{margin:0;font-size:.87rem;color:var(--muted);line-height:1.55}

/* ---------- formatos ---------- */
.formats{display:flex;flex-wrap:wrap;gap:9px;margin-top:6px}
.formats span{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;
  border:1px solid var(--line);border-radius:8px;padding:8px 12px;color:var(--blue2);
  background:rgba(25,167,224,.05);
}
.formats span.off{color:var(--dim);border-color:var(--line-soft);background:transparent;text-decoration:line-through}

/* ---------- seguridad ---------- */
.band{background:var(--ink2);border-block:1px solid var(--line-soft)}
.security{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.security > div{display:flex;gap:13px;padding:17px 18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.security span{color:var(--green);font-family:var(--mono);font-weight:700;flex:0 0 auto}
.security b{display:block;font-size:.92rem;margin-bottom:3px}
.security p{margin:0;font-size:.85rem;color:var(--muted)}

/* ---------- preguntas ---------- */
.faq{display:grid;gap:10px;max-width:78ch}
.faq details{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);overflow:hidden}
.faq summary{
  cursor:pointer;padding:16px 19px;font-weight:600;font-size:.95rem;
  list-style:none;display:flex;align-items:center;gap:12px;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary:before{content:'+';font-family:var(--mono);color:var(--blue);font-weight:700;flex:0 0 auto}
.faq details[open] summary:before{content:'–'}
.faq details[open] summary{border-bottom:1px solid var(--line-soft)}
.faq p{margin:0;padding:15px 19px;font-size:.9rem;color:var(--muted)}

/* ---------- cierre ---------- */
.closing{
  text-align:center;
  background:radial-gradient(720px 320px at 50% 0%,rgba(25,167,224,.15),transparent 62%),var(--ink);
}
.closing .lead{margin:16px auto 26px}
.closing .hero-actions{justify-content:center}

/* ---------- pie ---------- */
.site-foot{border-top:1px solid var(--line-soft);padding:34px 0;background:var(--ink2)}
.foot-grid{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-start;justify-content:space-between}
.foot-links{display:flex;flex-wrap:wrap;gap:8px 22px}
.foot-links a{font-size:.85rem;color:var(--muted)}
.foot-links a:hover{color:var(--blue2)}
.site-foot small{display:block;color:var(--dim);font-size:.75rem;margin-top:10px;font-family:var(--mono)}

/* ---------- acceso ---------- */
.login-shell{min-height:100vh;display:grid;grid-template-columns:1.05fr .95fr}
.login-side{
  padding:56px 52px;display:flex;flex-direction:column;justify-content:center;
  background:
    radial-gradient(760px 380px at 20% 10%,rgba(25,167,224,.16),transparent 62%),
    var(--ink2);
  border-right:1px solid var(--line-soft);
}
.login-side h1{font-size:clamp(1.9rem,3.4vw,2.7rem);margin-bottom:16px}
.login-side .lead{margin-bottom:34px}
.login-features{display:grid;gap:16px;max-width:46ch}
.login-features > div{display:flex;gap:13px}
.login-features span{font-family:var(--mono);font-size:.66rem;font-weight:600;color:var(--blue2);border:1px solid var(--line);border-radius:7px;padding:5px 7px;height:max-content}
.login-features b{display:block;font-size:.88rem;margin-bottom:2px}
.login-features p{margin:0;font-size:.82rem;color:var(--muted)}
.login-main{display:grid;place-items:center;padding:44px 28px;background:var(--ink)}
.login-box{width:100%;max-width:360px}
.login-box h2{font-size:1.7rem;margin:8px 0 8px}
.login-box > p{color:var(--muted);font-size:.9rem}
.login-box label{display:block;font-size:.78rem;font-weight:600;color:var(--muted);margin:22px 0 8px;font-family:var(--mono);letter-spacing:.06em;text-transform:uppercase}
.field{position:relative}
.field input{
  width:100%;padding:14px 68px 14px 14px;border:1px solid var(--line);border-radius:10px;
  background:var(--panel);color:var(--text);font-size:1rem;outline:0;min-height:50px;
}
.field input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(25,167,224,.16)}
.field button{
  position:absolute;right:7px;top:8px;border:0;background:transparent;cursor:pointer;
  color:var(--blue2);font-family:var(--mono);font-size:.68rem;font-weight:700;padding:7px;
}
.login-box .btn{width:100%;margin-top:20px;justify-content:space-between}
.login-note{margin-top:24px;text-align:center;font-family:var(--mono);font-size:.68rem;color:var(--dim)}
.alert-error{
  margin-top:16px;padding:11px 14px;border-radius:10px;font-size:.85rem;
  background:rgba(255,90,80,.1);border:1px solid rgba(255,90,80,.32);color:#ffb1a9;
}
.back-home{display:inline-flex;align-items:center;gap:7px;font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;color:var(--dim);text-transform:uppercase}
.back-home:hover{color:var(--blue2)}

/* ---------- adaptable ---------- */
@media(max-width:940px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .cards,.steps{grid-template-columns:repeat(2,1fr)}
  .login-shell{grid-template-columns:1fr}
  .login-side{display:none}
}
@media(max-width:620px){
  section{padding:56px 0}
  .hero{padding:44px 0 52px}
  .cards,.steps,.security{grid-template-columns:1fr}
  .nav-links a:not(.cta){display:none}
  .container{padding:0 18px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*:before,*:after{animation:none!important;transition:none!important}
}