/* =========================================================
   Systems4Fun — Sistema de diseño
   Concepto: "De tu historia a tu sistema"
   Firma: el trazo de marcatextos que convierte lenguaje en software
   ========================================================= */

:root{
  /* Color */
  --tinta:      #181528;
  --tinta-soft: #2c2840;
  --papel:      #f7f4ed;
  --papel-2:    #efe9dc;
  --blanco:     #ffffff;
  --marigold:   #ff7a18;
  --marigold-d: #e2660a;
  --menta:      #0fb890;
  --menta-d:    #0a9b78;
  --marca:      #ffe03d;   /* marcatextos / highlighter */
  --linea:      rgba(24,21,40,.12);
  --muted:      #5c5870;

  /* Tipografía */
  --font-display: "Bricolage Grotesque", "Plus Jakarta Sans", system-ui, sans-serif;
  --font-body:    "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, monospace;

  /* Escala */
  --wrap: 1160px;
  --r:    18px;
  --r-sm: 12px;
  --shadow:    0 18px 50px -24px rgba(24,21,40,.45);
  --shadow-sm: 0 6px 22px -12px rgba(24,21,40,.35);
}

/* ===== Reset ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--font-body);
  background:var(--papel);
  color:var(--tinta);
  line-height:1.6;
  font-size:clamp(16px,1.05vw,17px);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}
ul,ol{list-style:none}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(20px,5vw,40px)}

.skip-link{position:absolute;left:-9999px;top:0;background:var(--tinta);color:#fff;padding:10px 16px;border-radius:0 0 10px 0;z-index:200}
.skip-link:focus{left:0}

:focus-visible{outline:3px solid var(--marigold);outline-offset:3px;border-radius:4px}

/* ===== Tipografía base ===== */
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.05;font-weight:700;letter-spacing:-.02em}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--marigold-d);
  font-weight:500;
  margin-bottom:14px;
}

/* ===== Marcatextos (firma) ===== */
.mark{
  position:relative;
  white-space:nowrap;
  z-index:0;
}
.mark::before{
  content:"";
  position:absolute;
  left:-.1em;right:-.1em;
  bottom:.06em;
  height:.5em;
  background:var(--marca);
  z-index:-1;
  transform:skewX(-12deg) scaleX(1);
  transform-origin:left center;
  border-radius:3px;
}
.mark-animate::before{
  transform:skewX(-12deg) scaleX(0);
  animation:mark-in 1.1s cubic-bezier(.6,.1,.2,1) .5s forwards;
}
@keyframes mark-in{to{transform:skewX(-12deg) scaleX(1)}}

/* ===== Botones ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--font-display);
  font-weight:600;
  font-size:1rem;
  padding:13px 24px;
  border-radius:999px;
  transition:transform .15s ease, box-shadow .2s ease, background .2s ease;
  border:2px solid transparent;
  text-align:center;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--marigold);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--marigold-d);transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--tinta);border-color:var(--tinta)}
.btn-ghost:hover{background:var(--tinta);color:#fff;transform:translateY(-2px)}
.btn-sm{padding:9px 18px;font-size:.92rem}
.btn-lg{padding:15px 30px;font-size:1.08rem}
.btn-block{width:100%}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(247,244,237,.82);
  backdrop-filter:saturate(140%) blur(12px);
  border-bottom:1px solid var(--linea);
}
.header-inner{display:flex;align-items:center;gap:24px;height:72px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:1.32rem;letter-spacing:-.03em}
.brand-mark{display:grid;place-items:center}
.brand-4{color:var(--marigold)}
.main-nav{display:flex;gap:26px;margin-left:auto;font-weight:500;font-size:.97rem}
.main-nav a{position:relative;padding:4px 0;color:var(--tinta-soft)}
.main-nav a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;background:var(--marigold);transition:width .2s ease}
.main-nav a:hover{color:var(--tinta)}
.main-nav a:hover::after{width:100%}
.header-cta{margin-left:4px}

.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px;margin-left:auto}
.nav-toggle span{width:24px;height:2px;background:var(--tinta);border-radius:2px;transition:.25s}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.mobile-nav{display:none;flex-direction:column;gap:4px;padding:12px clamp(20px,5vw,40px) 22px;border-bottom:1px solid var(--linea);background:var(--papel)}
.mobile-nav a{padding:12px 4px;font-weight:600;border-bottom:1px solid var(--linea)}
.mobile-nav a.btn{margin-top:10px;border:none}

/* ===== Hero ===== */
.hero{padding:clamp(48px,8vw,96px) 0 clamp(40px,6vw,72px);position:relative}
.hero::before{
  content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(60% 60% at 88% 8%, rgba(255,122,24,.12), transparent 70%),
    radial-gradient(50% 50% at 6% 90%, rgba(15,184,144,.10), transparent 70%);
}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(32px,5vw,64px);align-items:center}
.hero-title{font-size:clamp(2.4rem,5.4vw,4.1rem);font-weight:800;margin-bottom:22px}
.hero-sub{font-size:clamp(1.06rem,1.6vw,1.22rem);color:var(--tinta-soft);max-width:34ch;margin-bottom:30px}
.hero-sub strong{color:var(--tinta)}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:30px}
.hero-chips{display:flex;flex-wrap:wrap;gap:10px}
.hero-chips li{
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.02em;
  background:var(--blanco);border:1px solid var(--linea);
  padding:7px 13px;border-radius:999px;color:var(--tinta-soft);
}
.hero-chips li::before{content:"✓ ";color:var(--menta-d);font-weight:700}

/* ===== Hero demo (firma) ===== */
.hero-demo{display:flex;justify-content:center}
.demo-card{
  width:100%;max-width:420px;background:var(--blanco);
  border:1px solid var(--linea);border-radius:24px;
  padding:22px;box-shadow:var(--shadow);
  transform:rotate(-1deg);
}
.demo-note{background:var(--papel-2);border-radius:14px;padding:16px 18px;position:relative}
.demo-note-from{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.demo-note-text{font-size:1.06rem;font-weight:500;margin-top:6px;min-height:2.8em}
.demo-note-text .hl{background:linear-gradient(transparent 55%, var(--marca) 55%);padding:0 2px;border-radius:2px}
.demo-arrow{display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--marigold);margin:14px 0 4px}
.demo-arrow-label{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.demo-app{border:1px solid var(--linea);border-radius:14px;overflow:hidden;background:var(--blanco)}
.demo-app-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;background:var(--tinta);color:#fff}
.demo-app-bar .dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.4)}
.demo-app-title{font-family:var(--font-mono);font-size:.74rem;margin-left:8px;color:rgba(255,255,255,.9)}
.demo-app-body{padding:16px 18px;min-height:128px}
.demo-app-body .pill-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.demo-app-body .pill{font-size:.8rem;border:1px solid var(--linea);border-radius:999px;padding:6px 12px}
.demo-app-body .pill.on{background:var(--marigold);color:#fff;border-color:var(--marigold)}
.demo-app-body .pill.menta{background:var(--menta);color:#fff;border-color:var(--menta)}
.demo-app-body .label{font-size:.78rem;color:var(--muted);margin-bottom:6px}
.demo-app-body .confirm{margin-top:6px;background:var(--menta);color:#fff;text-align:center;padding:10px;border-radius:10px;font-weight:600;font-family:var(--font-display)}
.demo-fade{animation:demo-fade .5s ease}
@keyframes demo-fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ===== Tira de confianza ===== */
.trust{background:var(--tinta);color:rgba(255,255,255,.86)}
.trust-inner{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;padding:16px 0;font-family:var(--font-mono);font-size:.82rem;letter-spacing:.02em}
.trust-inner span[aria-hidden]{color:var(--marigold)}

/* ===== Secciones ===== */
.section{padding:clamp(60px,9vw,110px) 0}
.section-alt{background:var(--papel-2)}
.section-head{max-width:46rem;margin:0 auto clamp(36px,5vw,56px);text-align:center}
.section-head-left,.faq-wrap .section-head{text-align:left;margin-inline:0}
.section-title{font-size:clamp(1.9rem,3.6vw,2.9rem);font-weight:800}
.section-lead{font-size:clamp(1.04rem,1.4vw,1.18rem);color:var(--tinta-soft);margin-top:14px}

/* ===== Pasos ===== */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;counter-reset:s}
.step{background:var(--blanco);border:1px solid var(--linea);border-radius:var(--r);padding:30px 26px;position:relative;transition:transform .2s ease,box-shadow .2s ease}
.step:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm)}
.step-num{font-family:var(--font-mono);font-size:.9rem;font-weight:700;color:#fff;background:var(--tinta);width:44px;height:44px;border-radius:12px;display:grid;place-items:center;margin-bottom:18px}
.step:nth-child(2) .step-num{background:var(--marigold)}
.step:nth-child(3) .step-num{background:var(--menta)}
.step-title{font-size:1.32rem;margin-bottom:10px}
.step p{color:var(--tinta-soft)}

/* ===== Cards ===== */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.card{background:var(--blanco);border:1px solid var(--linea);border-radius:var(--r);padding:26px 22px;transition:transform .2s ease,box-shadow .2s ease,border-color .2s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-sm);border-color:rgba(255,122,24,.4)}
.card-icon{font-size:1.7rem;display:block;margin-bottom:14px}
.card h3{font-size:1.16rem;margin-bottom:8px}
.card p{font-size:.95rem;color:var(--tinta-soft)}
.card-feature{background:var(--tinta);color:#fff;grid-column:span 2}
.card-feature h3,.card-feature p{color:#fff}
.card-feature p{color:rgba(255,255,255,.82)}
.card-link{display:inline-block;margin-top:14px;color:var(--marca);font-weight:600;font-family:var(--font-display)}

/* ===== Feature (skills) ===== */
.feature-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,5vw,64px);align-items:center}
.feature-copy .section-title{margin-bottom:6px}
.checklist{margin:22px 0 28px;display:grid;gap:12px}
.checklist li{position:relative;padding-left:34px;color:var(--tinta-soft)}
.checklist li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;background:var(--menta);color:#fff;border-radius:7px;display:grid;place-items:center;font-size:.8rem;font-weight:700}
.feature-visual{display:flex;justify-content:center}
.skill-chat{width:100%;max-width:400px;background:var(--papel-2);border:1px solid var(--linea);border-radius:22px;padding:20px;display:grid;gap:12px}
.skill-msg{padding:13px 16px;border-radius:16px;font-size:.96rem;max-width:88%}
.skill-msg-user{background:var(--blanco);border:1px solid var(--linea);justify-self:end;border-bottom-right-radius:5px}
.skill-msg-ai{background:var(--tinta);color:#fff;justify-self:start;border-bottom-left-radius:5px;line-height:1.7}
.skill-badge{display:inline-block;font-family:var(--font-mono);font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;background:var(--marigold);color:#fff;padding:3px 9px;border-radius:999px;margin-bottom:8px}
.skill-cta{display:inline-block;margin-top:10px;background:var(--menta);color:#fff;padding:7px 14px;border-radius:999px;font-weight:600;font-size:.86rem;font-family:var(--font-display)}

/* ===== Sección oscura / comparativa ===== */
.section-dark{background:var(--tinta);color:#fff}
.section-head-light .section-title{color:#fff}
.section-head-light .section-lead{color:rgba(255,255,255,.78)}
.section-head-light .eyebrow{color:var(--marca)}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:920px;margin-inline:auto}
.compare-col{border-radius:var(--r);padding:30px 28px}
.compare-old{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12)}
.compare-new{background:var(--blanco);color:var(--tinta);position:relative;box-shadow:var(--shadow)}
.compare-col h3{font-size:1.3rem;margin-bottom:18px}
.compare-old h3{color:rgba(255,255,255,.7)}
.compare-col ul{display:grid;gap:13px}
.compare-col li{position:relative;padding-left:30px;font-size:.98rem}
.compare-old li{color:rgba(255,255,255,.62)}
.compare-old li::before{content:"✕";position:absolute;left:0;color:#ff6b6b;font-weight:700}
.compare-new li::before{content:"✓";position:absolute;left:0;color:var(--menta-d);font-weight:700}
.compare-flag{position:absolute;top:-14px;left:28px;background:var(--marigold);color:#fff;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;padding:5px 12px;border-radius:999px;font-weight:600}

/* ===== FAQ ===== */
.faq-wrap{display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(30px,5vw,60px);align-items:start}
.faq-list{display:grid;gap:12px}
.faq-item{background:var(--blanco);border:1px solid var(--linea);border-radius:var(--r-sm);overflow:hidden;transition:border-color .2s}
.faq-item[open]{border-color:rgba(255,122,24,.45)}
.faq-item summary{padding:18px 22px;font-family:var(--font-display);font-weight:600;font-size:1.08rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:16px;list-style:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.5rem;color:var(--marigold);transition:transform .2s;line-height:1}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 22px 20px;color:var(--tinta-soft)}
.faq-item a{color:var(--marigold-d);font-weight:600;text-decoration:underline;text-underline-offset:2px}

/* ===== CTA / Contacto ===== */
.section-cta{background:linear-gradient(160deg,var(--marigold) 0%,#ff9742 100%);color:#fff}
.cta-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(36px,5vw,64px);align-items:center}
.section-cta .eyebrow{color:rgba(255,255,255,.9)}
.section-cta .section-title{color:#fff;font-size:clamp(1.9rem,3.4vw,2.8rem)}
.section-cta .section-lead{color:rgba(255,255,255,.92)}
.cta-direct{margin-top:26px;display:grid;gap:14px}
.cta-direct li{display:flex;flex-direction:column;gap:2px}
.cta-direct span{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.8)}
.cta-direct a{font-weight:600;font-size:1.06rem;text-decoration:underline;text-underline-offset:3px}
.cta-form{background:var(--blanco);color:var(--tinta);border-radius:var(--r);padding:clamp(24px,3vw,34px);box-shadow:var(--shadow);display:grid;gap:16px}
.field{display:grid;gap:6px}
.field label{font-weight:600;font-size:.92rem;font-family:var(--font-display)}
.field input,.field textarea{
  font-family:inherit;font-size:1rem;
  padding:12px 14px;border:1.5px solid var(--linea);border-radius:10px;
  background:var(--papel);color:var(--tinta);transition:border-color .15s,box-shadow .15s;resize:vertical;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--marigold);box-shadow:0 0 0 3px rgba(255,122,24,.18)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.form-note{font-size:.82rem;color:var(--muted);text-align:center}
.form-note a{color:var(--marigold-d);text-decoration:underline}
.form-status{font-size:.92rem;text-align:center;font-weight:600;min-height:1.2em}
.form-status.ok{color:var(--menta-d)}
.form-status.err{color:#d9402b}

/* ===== Footer ===== */
.site-footer{background:var(--tinta);color:rgba(255,255,255,.78);padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px}
.brand-footer{font-size:1.5rem;color:#fff;margin-bottom:14px;display:inline-flex}
.footer-brand p{font-size:.95rem;max-width:38ch;margin-bottom:12px}
.footer-ai{font-family:var(--font-mono);font-size:.78rem;color:rgba(255,255,255,.6)}
.footer-col h4{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--marca);margin-bottom:16px;font-weight:500}
.footer-col a{display:block;padding:6px 0;color:rgba(255,255,255,.78);transition:color .15s}
.footer-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;margin-top:44px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);font-size:.86rem;color:rgba(255,255,255,.6)}

/* ===== Páginas legales ===== */
.legal-hero{background:var(--tinta);color:#fff;padding:clamp(48px,7vw,80px) 0 clamp(36px,5vw,52px)}
.legal-hero h1{font-size:clamp(2rem,4vw,3rem);font-weight:800;margin-top:8px}
.legal-hero .eyebrow{color:var(--marca)}
.legal-hero p{color:rgba(255,255,255,.78);margin-top:12px;max-width:60ch}
.legal-body{padding:clamp(40px,6vw,72px) 0 clamp(56px,8vw,90px)}
.legal-body .wrap{max-width:780px}
.legal-body h2{font-size:1.5rem;margin:38px 0 12px}
.legal-body h3{font-size:1.15rem;margin:24px 0 8px}
.legal-body p,.legal-body li{color:var(--tinta-soft);margin-bottom:12px}
.legal-body ul{list-style:disc;padding-left:22px;margin-bottom:14px}
.legal-body ul li{margin-bottom:8px}
.legal-body a{color:var(--marigold-d);text-decoration:underline;text-underline-offset:2px}
.legal-body strong{color:var(--tinta)}
.legal-note{background:var(--marca);color:var(--tinta);border-radius:var(--r-sm);padding:18px 22px;font-weight:500;margin:24px 0}
.legal-meta{font-family:var(--font-mono);font-size:.82rem;color:var(--muted);margin-top:8px}
.legal-toc{background:var(--papel-2);border-radius:var(--r-sm);padding:22px 26px;margin-bottom:34px}
.legal-toc h2{font-size:1rem;margin:0 0 12px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:.08em}
.legal-toc ol{list-style:decimal;padding-left:20px;display:grid;gap:6px}
.legal-toc a{color:var(--tinta-soft)}
.legal-placeholder{background:rgba(255,122,24,.1);border:1px dashed var(--marigold);border-radius:6px;padding:1px 7px;font-family:var(--font-mono);font-size:.86em;color:var(--marigold-d)}
.back-home{display:inline-flex;align-items:center;gap:8px;margin-top:30px;font-weight:600;color:var(--marigold-d)}

/* ===== Responsive ===== */
@media (max-width:920px){
  .main-nav,.header-cta{display:none}
  .nav-toggle{display:flex}
  .mobile-nav[data-open="true"]{display:flex}
  .hero-grid{grid-template-columns:1fr;text-align:left}
  .hero-sub{max-width:46ch}
  .hero-demo{order:-1;margin-bottom:8px}
  .demo-card{max-width:360px}
  .steps{grid-template-columns:1fr}
  .cards{grid-template-columns:repeat(2,1fr)}
  .card-feature{grid-column:span 2}
  .feature-grid,.compare,.faq-wrap,.cta-grid{grid-template-columns:1fr}
  .feature-visual{order:-1}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:560px){
  .cards{grid-template-columns:1fr}
  .card-feature{grid-column:span 1}
  .footer-grid{grid-template-columns:1fr}
  .hero-actions .btn{flex:1}
}

/* ===== Movimiento reducido ===== */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto}
  .mark-animate::before{transform:skewX(-12deg) scaleX(1)}
}