/* ==========================================================================
   Motor Exacto — Hoja de estilos principal
   ========================================================================== */

:root{
  --color-bg:#f6f8fb;
  --color-surface:#ffffff;
  --color-border:#e2e6ee;
  --color-text:#1a2233;
  --color-text-soft:#5b6478;
  --color-primary:#155ecf;
  --color-primary-dark:#0e3f8f;
  --color-primary-light:#e8f0fd;
  --color-accent:#0f9d6f;
  --color-accent-light:#e5f7ef;
  --color-danger:#c62f3c;
  --color-danger-light:#fbe9ea;
  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:20px;
  --shadow-sm:0 1px 2px rgba(20,30,60,.06);
  --shadow-md:0 6px 20px rgba(20,30,60,.08);
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --max-width: 1080px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-body);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
img{ max-width:100%; display:block; }
a{ color:var(--color-primary); text-decoration:none; }
a:hover{ text-decoration:underline; }
h1,h2,h3,h4{ line-height:1.25; margin:0 0 .5em; }
p{ margin:0 0 1em; }
.container{
  max-width:var(--max-width);
  margin:0 auto;
  padding:0 20px;
}
.visually-hidden{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0;
}
.skip-link{
  position:absolute; left:-999px; top:0; background:var(--color-primary);
  color:#fff; padding:10px 16px; z-index:1000; border-radius:0 0 8px 0;
}
.skip-link:focus{ left:0; }

/* ---------- Header ---------- */
.site-header{
  background:var(--color-surface);
  border-bottom:1px solid var(--color-border);
  position:sticky; top:0; z-index:100;
}
.site-header .container{
  display:flex; align-items:center; justify-content:space-between;
  min-height:64px; gap:16px;
}
.logo{
  display:flex; align-items:center; gap:8px;
  font-weight:800; font-size:1.15rem; color:var(--color-text);
}
.logo:hover{ text-decoration:none; }
.logo svg{ flex-shrink:0; }
.logo .tagline{
  display:none;
}
.main-nav{ display:flex; align-items:center; gap:4px; }
.main-nav a{
  color:var(--color-text); font-weight:600; font-size:.95rem;
  padding:10px 12px; border-radius:var(--radius-sm);
}
.main-nav a:hover{ background:var(--color-primary-light); text-decoration:none; color:var(--color-primary-dark); }
.nav-toggle{
  display:none; background:none; border:1px solid var(--color-border);
  border-radius:var(--radius-sm); width:44px; height:44px; cursor:pointer;
  align-items:center; justify-content:center;
}
.nav-toggle svg{ pointer-events:none; }

@media (max-width: 760px){
  .main-nav{
    display:none; position:absolute; top:64px; left:0; right:0;
    background:var(--color-surface); border-bottom:1px solid var(--color-border);
    flex-direction:column; padding:8px; box-shadow:var(--shadow-md);
  }
  .main-nav.is-open{ display:flex; }
  .main-nav a{ width:100%; padding:14px 12px; }
  .nav-toggle{ display:flex; }
}

/* ---------- Hero / búsqueda ---------- */
.hero{
  padding:56px 0 40px;
  text-align:center;
  background:linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}
.hero h1{ font-size:2.1rem; max-width:720px; margin:0 auto .4em; }
.hero .subtitle{ color:var(--color-text-soft); font-size:1.08rem; max-width:600px; margin:0 auto 28px; }
.search-box{
  max-width:560px; margin:0 auto; position:relative;
}
.search-box label{
  display:block; font-weight:700; margin-bottom:8px; font-size:.95rem;
}
.search-box input{
  width:100%; padding:16px 18px; font-size:1rem; border-radius:var(--radius-md);
  border:1px solid var(--color-border); box-shadow:var(--shadow-sm);
  background:var(--color-surface);
}
.search-box input:focus{ outline:2px solid var(--color-primary); outline-offset:2px; }
.search-results{
  margin-top:8px; text-align:left; background:var(--color-surface);
  border:1px solid var(--color-border); border-radius:var(--radius-md);
  box-shadow:var(--shadow-md); overflow:hidden; display:none;
}
.search-results.is-visible{ display:block; }
.search-results a{
  display:block; padding:12px 16px; color:var(--color-text); border-bottom:1px solid var(--color-border);
}
.search-results a:last-child{ border-bottom:none; }
.search-results a:hover{ background:var(--color-primary-light); text-decoration:none; }
.search-results .no-results{ padding:14px 16px; color:var(--color-text-soft); }

/* ---------- Secciones / categorías ---------- */
.section{ padding:36px 0; }
.section-title{ font-size:1.4rem; margin-bottom:18px; }
.card-grid{
  display:grid; grid-template-columns:repeat(auto-fill, minmax(240px,1fr)); gap:16px;
}
.category-card{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-md); padding:20px; box-shadow:var(--shadow-sm);
}
.category-card h3{ font-size:1.1rem; display:flex; align-items:center; gap:8px; }
.category-card ul{ list-style:none; margin:12px 0 0; padding:0; }
.category-card li{ margin-bottom:6px; }
.category-card a{ font-weight:600; }

/* ---------- Breadcrumbs ---------- */
.breadcrumbs{
  font-size:.85rem; color:var(--color-text-soft); padding:14px 0 0;
}
.breadcrumbs ol{ list-style:none; display:flex; flex-wrap:wrap; gap:4px; margin:0; padding:0; }
.breadcrumbs li:not(:last-child)::after{ content:"›"; margin-left:6px; color:var(--color-border); }
.breadcrumbs a{ color:var(--color-text-soft); }

/* ---------- Páginas de herramienta ---------- */
.tool-header{ padding:28px 0 8px; }
.tool-header h1{ font-size:1.7rem; }
.tool-header .lead{ color:var(--color-text-soft); max-width:640px; }

.tool-layout{
  display:grid; grid-template-columns: minmax(280px, 420px) 1fr; gap:28px;
  align-items:start; padding:20px 0 8px;
}
@media (max-width: 780px){
  .tool-layout{ grid-template-columns:1fr; }
}

.calc-card{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-lg); padding:24px; box-shadow:var(--shadow-sm);
}
.field{ margin-bottom:16px; }
.field label{ display:block; font-weight:700; font-size:.9rem; margin-bottom:6px; }
.field .hint{ font-size:.78rem; color:var(--color-text-soft); margin-top:4px; }
.field input, .field select{
  width:100%; padding:12px 14px; font-size:1rem; border-radius:var(--radius-sm);
  border:1px solid var(--color-border); background:#fff; color:var(--color-text);
}
.field input:focus, .field select:focus{ outline:2px solid var(--color-primary); outline-offset:1px; }
.field-row{ display:grid; grid-template-columns:1fr 1fr; gap:12px; }
@media (max-width:420px){ .field-row{ grid-template-columns:1fr; } }

.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  background:var(--color-primary); color:#fff; font-weight:700; font-size:1rem;
  padding:14px 22px; border:none; border-radius:var(--radius-sm); cursor:pointer;
  width:100%; box-shadow:var(--shadow-sm);
}
.btn:hover{ background:var(--color-primary-dark); }
.btn:focus-visible{ outline:2px solid var(--color-text); outline-offset:2px; }
.btn.secondary{ background:var(--color-accent); }
.btn.secondary:hover{ background:#0b7d59; }

.error-msg{
  background:var(--color-danger-light); color:var(--color-danger); border-radius:var(--radius-sm);
  padding:10px 14px; font-size:.88rem; margin-top:10px; display:none; font-weight:600;
}
.error-msg.is-visible{ display:block; }

.result-panel{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-lg); box-shadow:var(--shadow-sm); overflow:hidden;
}
.result-panel .result-empty{ padding:32px 24px; color:var(--color-text-soft); text-align:center; }
.result-main{
  background:var(--color-accent-light); padding:24px; border-bottom:1px solid var(--color-border);
  display:none;
}
.result-main.is-visible{ display:block; }
.result-main .figure{ font-size:2.1rem; font-weight:800; color:var(--color-primary-dark); }
.result-main .label{ font-weight:600; color:var(--color-text-soft); }
.result-breakdown{ padding:20px 24px; display:none; }
.result-breakdown.is-visible{ display:block; }
.result-breakdown dl{ display:grid; grid-template-columns:1fr auto; gap:8px 12px; margin:0; }
.result-breakdown dt{ color:var(--color-text-soft); }
.result-breakdown dd{ margin:0; font-weight:700; text-align:right; }

.content-block{ padding:28px 0; }
.content-block h2{ font-size:1.3rem; margin-top:1.4em; }
.content-block table{ width:100%; border-collapse:collapse; margin:14px 0; }
.content-block th,.content-block td{ padding:10px 12px; border:1px solid var(--color-border); text-align:left; }
.content-block th{ background:var(--color-primary-light); }

.related-tools{ padding:8px 0 32px; }
.related-tools ul{ list-style:none; margin:0; padding:0; display:flex; flex-wrap:wrap; gap:10px; }
.related-tools a{
  display:inline-block; background:var(--color-surface); border:1px solid var(--color-border);
  padding:10px 14px; border-radius:999px; font-weight:600; font-size:.88rem;
}
.related-tools a:hover{ background:var(--color-primary-light); text-decoration:none; }

.faq{ padding:8px 0 32px; }
.faq details{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-sm); margin-bottom:10px; padding:14px 16px;
}
.faq summary{ font-weight:700; cursor:pointer; }
.faq p{ margin:10px 0 0; color:var(--color-text-soft); }

.ad-slot{
  border:1px dashed var(--color-border); border-radius:var(--radius-sm);
  padding:14px; text-align:center; color:var(--color-text-soft); font-size:.8rem;
  margin:24px 0; background:#fbfcfe;
}

/* ---------- Guías ---------- */
.guide-list{ list-style:none; margin:0; padding:0; display:grid; gap:14px; }
.guide-list li{
  background:var(--color-surface); border:1px solid var(--color-border);
  border-radius:var(--radius-md); padding:18px 20px;
}
.guide-list a{ font-size:1.05rem; font-weight:700; }
.guide-list p{ margin:6px 0 0; color:var(--color-text-soft); }

/* ---------- Footer ---------- */
.site-footer{
  background:#101827; color:#c7cede; margin-top:48px; padding:40px 0 24px;
}
.site-footer a{ color:#e6ebf5; }
.footer-grid{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(160px,1fr)); gap:24px; margin-bottom:24px;
}
.footer-grid h4{ color:#fff; font-size:.95rem; }
.footer-grid ul{ list-style:none; margin:0; padding:0; }
.footer-grid li{ margin-bottom:8px; font-size:.9rem; }
.footer-bottom{
  border-top:1px solid #232c3d; padding-top:18px; font-size:.8rem; color:#8b93a7;
  display:flex; flex-wrap:wrap; justify-content:space-between; gap:8px;
}

/* ---------- 404 ---------- */
.error-page{ text-align:center; padding:80px 0; }
.error-page .code{ font-size:5rem; font-weight:800; color:var(--color-primary); margin:0; }

/* ---------- Legal ---------- */
.legal-content h2{ margin-top:1.6em; }
.legal-content .placeholder{ background:#fff3cd; border:1px solid #ffe08a; padding:2px 6px; border-radius:4px; }

/* Print */
@media print{
  .site-header,.site-footer,.ad-slot,.related-tools{ display:none; }
}