:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --navy: #0f172a;
  --ink: #111827;
  --muted: #64748b;
  --soft: #f3f4f6;
  --line: #e5e7eb;
  --white: #fff;
  --success: #10b981;
  --radius: 18px;
  --shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: #fff;
  line-height: 1.7;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1160px, 92%); margin: auto; }

.topbar {
  background: var(--navy);
  color: #dbeafe;
  font-size: 0.9rem;
  padding: 0.55rem 0;
}
.topbar .container {
  display: flex; justify-content: space-between; gap: 1rem; align-items: center;
}
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; }
.logo {
  display: flex; align-items: center; gap: 0.65rem;
  font-weight: 900; color: var(--navy); font-size: 1.12rem;
}
.logo-mark {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), #0ea5e9);
  display: grid; place-items: center; color: #fff; font-weight: 900;
}
.menu {
  display: flex; gap: 1.1rem; align-items: center;
  color: #334155; font-weight: 650; font-size: 0.95rem;
}
.menu a:hover { color: var(--primary); }
.mobile-toggle {
  display: none; border: 0; background: var(--soft);
  border-radius: 12px; padding: 0.7rem; cursor: pointer; font-size: 1.1rem;
}

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px; padding: 0.78rem 1.15rem;
  font-weight: 800; border: 1px solid transparent; transition: 0.2s; cursor: pointer;
}
.btn-primary {
  background: var(--primary); color: #fff;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.25);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); }
.btn-secondary { background: #fff; color: var(--navy); border-color: var(--line); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }

.hero {
  background: radial-gradient(circle at top left, #dbeafe 0, #fff 34%, #f8fafc 100%);
  padding: 5.2rem 0 3rem;
}
.hero-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 3rem; align-items: center;
}
.eyebrow {
  display: inline-flex; gap: 0.45rem; align-items: center;
  background: #dbeafe; color: #1e40af; border-radius: 999px;
  padding: 0.35rem 0.7rem; font-size: 0.88rem; font-weight: 800;
}
.hero h1 {
  font-size: clamp(2.3rem, 5vw, 4.4rem); line-height: 1.04;
  margin: 1rem 0; color: var(--navy); letter-spacing: -0.055em;
}
.lead { font-size: 1.17rem; color: #475569; max-width: 720px; }
.hero-actions { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-top: 1.7rem; }
.hero-card {
  background: #fff; border: 1px solid var(--line);
  border-radius: 28px; padding: 1.4rem; box-shadow: var(--shadow);
}
.metric-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.85rem; }
.metric { background: #f8fafc; border: 1px solid var(--line); border-radius: 18px; padding: 1rem; }
.metric strong { display: block; font-size: 1.6rem; color: var(--primary); }
.metric span { color: var(--muted); font-size: 0.9rem; }

.section { padding: 3rem 0; }
.section-head {
  display: flex; align-items: end; justify-content: space-between;
  gap: 1rem; margin-bottom: 1.4rem;
}
.section h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem); line-height: 1.12;
  color: var(--navy); margin: 0;
}
.section p.sub { color: var(--muted); max-width: 720px; }

.grid { display: grid; gap: 1.15rem; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius); padding: 1.2rem;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.04);
  transition: 0.2s;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.tag {
  display: inline-block; background: #eef2ff; color: #3730a3;
  font-weight: 800; border-radius: 999px;
  padding: 0.2rem 0.6rem; font-size: 0.78rem;
}
.card h3 { font-size: 1.22rem; line-height: 1.25; margin: 0.8rem 0; color: var(--navy); }
.card p { color: #475569; margin: 0.45rem 0; }
.read-more { color: var(--primary); font-weight: 900; }
.category-card { background: linear-gradient(145deg, #fff, #f8fafc); min-height: 160px; }

.newsletter {
  background: linear-gradient(135deg, var(--navy), #1e3a8a);
  color: #fff; border-radius: 32px; padding: 2.3rem;
  display: grid; grid-template-columns: 1fr 0.85fr; gap: 2rem; align-items: center;
}
.newsletter h2 { color: #fff; }
.newsletter input {
  width: 100%; border: 0; border-radius: 999px;
  padding: 1rem 1.1rem; margin-bottom: 0.75rem;
}
.newsletter .btn { width: 100%; }
.newsletter small { color: #cbd5e1; font-size: 0.85rem; }

.footer { background: var(--navy); color: #cbd5e1; padding: 3rem 0 1.2rem; }
.footer-grid { display: grid; grid-template-columns: 1.2fr repeat(3, 1fr); gap: 2rem; }
.footer h4 { color: #fff; }
.footer a { display: block; margin: 0.4rem 0; color: #cbd5e1; }
.footer a:hover { color: #fff; }
.copyright {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  margin-top: 2rem; padding-top: 1rem; color: #94a3b8;
}

.page-title { background: #f8fafc; border-bottom: 1px solid var(--line); padding: 3rem 0; }
.page-title h1 {
  font-size: clamp(2rem, 4vw, 3.3rem); color: var(--navy);
  letter-spacing: -0.04em; margin: 0.3rem 0;
}

.content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 2rem; }
.article { max-width: 780px; }
.article h1 {
  font-size: clamp(2rem, 4vw, 3.2rem); line-height: 1.08;
  color: var(--navy); letter-spacing: -0.04em;
}
.article h2 { font-size: 1.75rem; line-height: 1.2; color: var(--navy); margin-top: 2.2rem; }
.article h3 { font-size: 1.25rem; color: var(--navy); margin-top: 1.5rem; }
.article p { margin: 0.9rem 0; }
.article-meta { color: var(--muted); font-weight: 650; }

.toc {
  background: #f8fafc; border: 1px solid var(--line);
  border-radius: 18px; padding: 1rem 1.2rem; margin: 1.2rem 0 1.8rem;
}
.toc strong { display: block; margin-bottom: 0.4rem; color: var(--navy); }
.toc a { display: block; color: #334155; margin: 0.3rem 0; }
.toc a:hover { color: var(--primary); }

.article ul, .article ol { padding-left: 1.4rem; }
.article li { margin: 0.35rem 0; }

.note {
  background: #ecfdf5; border: 1px solid #a7f3d0;
  color: #065f46; border-radius: 16px; padding: 1rem 1.2rem;
}
.warning {
  background: #fff7ed; border: 1px solid #fed7aa;
  color: #9a3412; border-radius: 16px; padding: 1rem 1.2rem;
}
.affiliate-disclaimer {
  background: #f1f5f9; border-left: 4px solid var(--primary);
  color: #334155; border-radius: 8px; padding: 0.8rem 1rem;
  font-size: 0.92rem; margin: 1.2rem 0;
}

.sidebar { position: sticky; top: 92px; align-self: start; }
.sidebar-box {
  background: #fff; border: 1px solid var(--line);
  border-radius: 18px; padding: 1rem 1.2rem; margin-bottom: 1rem;
}
.sidebar-box h3 { margin-top: 0; color: var(--navy); font-size: 1.05rem; }

.breadcrumb { font-size: 0.9rem; color: var(--muted); }
.breadcrumb a { color: var(--primary); }

.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 16px; margin: 1rem 0; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { padding: 0.85rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { background: #f8fafc; color: var(--navy); font-weight: 800; }

.legal-content { max-width: 900px; }
.legal-content h2 { margin-top: 2rem; color: var(--navy); }
.legal-content h3 { color: var(--navy); margin-top: 1.4rem; }

.author-box {
  display: flex; gap: 1rem; align-items: flex-start;
  background: #f8fafc; border: 1px solid var(--line);
  border-radius: 16px; padding: 1rem 1.2rem; margin: 1.5rem 0;
}
.author-box .avatar {
  width: 56px; height: 56px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), #0ea5e9);
  color: #fff; font-weight: 900; font-size: 1.3rem;
  display: grid; place-items: center; flex-shrink: 0;
}
.author-box small { color: var(--muted); }

.faq details {
  background: #fff; border: 1px solid var(--line);
  border-radius: 14px; padding: 0.9rem 1.1rem; margin: 0.6rem 0;
}
.faq summary {
  cursor: pointer; font-weight: 800; color: var(--navy); list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; float: right; color: var(--primary); font-weight: 900; }
.faq details[open] summary::after { content: "−"; }
.faq details > p { margin-top: 0.6rem; color: #334155; }

.contact-form { display: grid; gap: 0.8rem; }
.contact-form input, .contact-form textarea {
  border: 1px solid var(--line); border-radius: 14px;
  padding: 0.9rem; font: inherit; width: 100%;
}
.contact-form label { font-weight: 700; color: var(--navy); font-size: 0.92rem; }

.pill-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.pill-list span {
  background: #f1f5f9; border-radius: 999px;
  padding: 0.35rem 0.7rem; font-weight: 750; color: #334155;
}

/* Cookie consent banner (CMP básico) */
.cookie-banner {
  position: fixed; bottom: 18px; left: 18px; right: 18px;
  max-width: 540px; margin: 0 auto;
  background: #0f172a; color: #f8fafc;
  border-radius: 18px; padding: 1.1rem 1.2rem;
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.35);
  z-index: 9999; display: none;
}
.cookie-banner.is-open { display: block; }
.cookie-banner h4 { margin: 0 0 0.4rem; color: #fff; }
.cookie-banner p { margin: 0 0 0.8rem; font-size: 0.92rem; color: #cbd5e1; }
.cookie-banner a { color: #93c5fd; text-decoration: underline; }
.cookie-banner .cookie-actions { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.cookie-banner .btn { padding: 0.55rem 0.9rem; font-size: 0.92rem; }
.cookie-banner .btn-link {
  background: transparent; color: #cbd5e1; border: 1px solid rgba(255,255,255,0.18);
}

/* Anuncios reales (sólo se mostrarán tras aprobación AdSense) */
.adsbygoogle { display: block; margin: 1.5rem 0; }
.ad-slot { display: none !important; }

@media (max-width: 900px) {
  .hero-grid, .newsletter, .content-layout, .footer-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .menu {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 1rem; width: 100%; flex-direction: column; align-items: flex-start;
  }
  .menu.open { display: flex; }
  .mobile-toggle { display: block; }
  .topbar .container { flex-direction: column; align-items: flex-start; }
  .sidebar { position: static; }
  .hero { padding-top: 3rem; }
  .section-head { display: block; }
}