/* SENTINEL-IA — landing estática. CSS propio, sin frameworks ni fuentes externas. */

:root {
  --bg: #0B1B2B;
  --bg-2: #0E2236;
  --bg-3: #11293f;
  --ink: #E8EEF4;
  --muted: #9DB1C4;
  --line: #1d3a52;
  --accent: #1FB57A;
  --cyan: #19C3D6;
  --danger: #E5615B;
  --radius: 12px;
  --maxw: 1140px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

img, svg { max-width: 100%; height: auto; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.01em; font-weight: 700; }
h1 { font-size: clamp(1.9rem, 5vw, 3.1rem); margin: 0 0 .6rem; }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); margin: 0 0 1rem; }
h3 { font-size: 1.18rem; margin: 0 0 .5rem; }
p { margin: 0 0 1rem; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

.section { padding: 76px 0; border-top: 1px solid var(--line); }
.section.alt { background: var(--bg-2); }
.eyebrow {
  text-transform: uppercase; letter-spacing: .14em; font-size: .76rem;
  font-weight: 700; color: var(--cyan); margin: 0 0 .7rem;
}
.lead { color: var(--muted); font-size: 1.08rem; max-width: 62ch; }

/* Header / nav */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 27, 43, 0.86);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; align-items: center; gap: 18px; padding: 12px 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand svg { width: 30px; height: 30px; }
.brand .mark-txt { font-size: 1.05rem; letter-spacing: .02em; }
.brand .mark-txt b { color: var(--cyan); }
.nav-links { display: flex; gap: 20px; margin-left: auto; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-size: .94rem; font-weight: 500; }
.nav-links a:hover { color: var(--ink); text-decoration: none; }
.lang { display: flex; gap: 4px; align-items: center; font-size: .82rem; }
.lang a { color: var(--muted); padding: 3px 7px; border-radius: 6px; }
.lang a[aria-current="true"] { color: var(--bg); background: var(--cyan); font-weight: 700; }
.lang a:hover { text-decoration: none; color: var(--ink); }
.lang .sep { color: var(--line); }

/* Buttons */
.btn {
  display: inline-block; padding: 13px 22px; border-radius: 10px;
  font-weight: 700; font-size: .98rem; cursor: pointer; border: 1px solid transparent;
  transition: transform .08s ease, background .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #04130d; }
.btn-primary:hover { background: #25c987; }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--cyan); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 1.4rem; }

/* Hero */
.hero {
  padding: 84px 0 64px;
  background:
    radial-gradient(1100px 480px at 78% -10%, rgba(25,195,214,.16), transparent 60%),
    radial-gradient(900px 420px at 8% 8%, rgba(31,181,122,.12), transparent 55%);
}
.hero .grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 48px; align-items: center; }
.hero .lead { font-size: 1.18rem; }
.hero-card {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; box-shadow: 0 24px 60px rgba(0,0,0,.35);
}
.hero-card h3 { color: var(--ink); font-size: 1rem; }
.chat-line { display: flex; gap: 9px; margin-bottom: 10px; align-items: flex-start; }
.chat-line .who {
  flex: 0 0 24px; height: 24px; border-radius: 6px; font-size: .68rem; font-weight: 700;
  display: grid; place-items: center; color: var(--bg);
}
.chat-line.bot .who { background: var(--cyan); }
.chat-line.user .who { background: var(--muted); }
.bubble {
  background: var(--bg-3); border: 1px solid var(--line); border-radius: 10px;
  padding: 9px 12px; font-size: .9rem; color: var(--ink); flex: 1;
}
.chat-line.user .bubble { background: var(--bg); }
.chat-note { font-size: .76rem; color: var(--muted); margin: 10px 0 0; }

/* Trust bar */
.trust { display: flex; flex-wrap: wrap; gap: 12px 26px; align-items: center; justify-content: center; }
.trust span {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: .9rem; color: var(--muted); font-weight: 500;
}
.trust .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }

/* Cards grid */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 30px; }
.card {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; transition: border-color .15s ease, transform .08s ease;
}
.card:hover { border-color: var(--cyan); transform: translateY(-2px); }
.card .tag {
  display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .06em;
  color: var(--cyan); border: 1px solid var(--line); border-radius: 6px;
  padding: 2px 8px; margin-bottom: 12px;
}
.card p { color: var(--muted); font-size: .95rem; margin-bottom: .6rem; }
.card ul { margin: 0; padding-left: 18px; color: var(--muted); font-size: .9rem; }
.card ul li { margin-bottom: 4px; }

/* Steps */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 28px; counter-reset: step; }
.step {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px;
}
.step .num {
  width: 34px; height: 34px; border-radius: 9px; background: var(--bg-3);
  border: 1px solid var(--cyan); color: var(--cyan); font-weight: 700;
  display: grid; place-items: center; margin-bottom: 12px;
}
.step p { color: var(--muted); font-size: .92rem; margin: 0; }

/* Law section */
.law-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 36px; }
.law-list { list-style: none; padding: 0; margin: 0; }
.law-list li {
  padding: 14px 0; border-bottom: 1px solid var(--line); color: var(--muted); font-size: .98rem;
}
.law-list li:last-child { border-bottom: none; }
.law-list strong { color: var(--ink); display: block; margin-bottom: 2px; }
.callout {
  background: linear-gradient(180deg, rgba(229,97,91,.08), transparent);
  border: 1px solid #4a2b2b; border-left: 3px solid var(--danger);
  border-radius: var(--radius); padding: 20px;
}
.callout h3 { color: var(--ink); }
.callout p { color: var(--muted); margin-bottom: 0; font-size: .95rem; }

/* FAQ */
.faq details {
  background: var(--bg-2); border: 1px solid var(--line); border-radius: 10px;
  padding: 4px 18px; margin-bottom: 12px;
}
.faq summary {
  cursor: pointer; font-weight: 600; padding: 14px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--cyan); font-size: 1.4rem; font-weight: 400; }
.faq details[open] summary::after { content: "\2013"; }
.faq details p { color: var(--muted); font-size: .96rem; padding-bottom: 14px; margin: 0; }

/* CTA final */
.cta-final {
  text-align: center;
  background:
    radial-gradient(800px 360px at 50% -20%, rgba(31,181,122,.18), transparent 60%),
    var(--bg-2);
}
.cta-final .lead { margin-left: auto; margin-right: auto; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); background: var(--bg); padding: 48px 0 36px; }
.foot-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr; gap: 28px; }
.foot-grid h4 { font-size: .82rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin: 0 0 12px; }
.foot-grid a { display: block; color: var(--muted); font-size: .92rem; margin-bottom: 7px; }
.foot-grid a:hover { color: var(--ink); text-decoration: none; }
.foot-bottom {
  margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  font-size: .82rem; color: var(--muted);
}

/* Responsive */
@media (max-width: 920px) {
  .hero .grid, .law-grid { grid-template-columns: 1fr; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .section { padding: 56px 0; }
  .hero { padding: 56px 0 44px; }
  .nav-links { display: none; }
  .cards, .steps { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .btn { width: 100%; text-align: center; }
}

/* Accessibility */
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto; transition: none; } }