:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fa;
  --text: #1b2430;
  --muted: #5b6878;
  --line: #e2e7ee;
  --accent: #1f6feb;
  --accent-dark: #1858c0;
  --shot-bg: #0d1117;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --bg: #0f141b;
    --bg-soft: #151c25;
    --text: #e6ebf1;
    --muted: #9aa7b6;
    --line: #26303c;
    --accent: #4c8dff;
    --accent-dark: #6aa0ff;
  }
}
:root[data-theme='dark'] {
  --bg: #0f141b;
  --bg-soft: #151c25;
  --text: #e6ebf1;
  --muted: #9aa7b6;
  --line: #26303c;
  --accent: #4c8dff;
  --accent-dark: #6aa0ff;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}
img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); }
h1, h2, h3 { line-height: 1.2; margin: 0 0 0.5em; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); letter-spacing: -0.01em; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px; }
section { padding: 72px 0; }

/* Cabecera */
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-weight: 800; font-size: 1.4rem; color: var(--text); text-decoration: none; letter-spacing: -0.02em; }
.logo span { color: var(--accent); }
nav { display: flex; align-items: center; gap: 20px; }
nav a { color: var(--muted); text-decoration: none; font-size: 0.95rem; }
nav a:hover { color: var(--text); }

/* Botones */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff !important;
  text-decoration: none;
  font-weight: 600;
  padding: 12px 22px;
  border-radius: 8px;
  border: 1px solid var(--accent);
}
.btn:hover { background: var(--accent-dark); }
.btn.ghost { background: transparent; color: var(--accent) !important; }
.btn.ghost:hover { background: var(--bg-soft); }
.btn.small { padding: 6px 14px; font-size: 0.9rem; }
.btn.big { font-size: 1.2rem; padding: 14px 28px; }

/* Portada */
.hero { padding-top: 64px; text-align: center; }
.kicker { color: var(--accent); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.85rem; }
.hero h1 { max-width: 820px; margin: 0 auto 0.4em; }
.lead { color: var(--muted); font-size: 1.15rem; max-width: 720px; margin: 0 auto 1.4em; }
.actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }

/* Capturas */
.shot {
  margin: 0;
  background: var(--shot-bg);
  border-radius: var(--radius);
  padding: 10px;
  box-shadow: 0 20px 50px rgba(15, 30, 60, 0.18);
  border: 1px solid #222b36;
  overflow: hidden;
}
.shot img { border-radius: 6px; }

/* Problemas */
.pains { background: var(--bg-soft); }
.grid3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
.pains p { color: var(--muted); margin: 0; }

/* Cómo funciona */
.how h2 { text-align: center; margin-bottom: 1.2em; }
.steps { list-style: none; counter-reset: step; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.steps li {
  counter-increment: step;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  color: var(--muted);
}
.steps li::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  margin-bottom: 12px;
}
.steps strong { color: var(--text); display: block; }

/* Qué hace */
.caps { background: var(--bg-soft); }
.caps h2 { text-align: center; margin-bottom: 1.2em; }
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.card {
  background: var(--bg);
  border: 1px solid var(--line);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px;
}
.card h3 { font-size: 1.05rem; }
.card p { color: var(--muted); margin: 0; font-size: 0.95rem; }

/* Funciones */
.features { padding-top: 24px; }
.feature { display: grid; grid-template-columns: 4fr 8fr; gap: 48px; align-items: center; margin-bottom: 88px; }
.feature:last-child { margin-bottom: 0; }
.feature.flip { grid-template-columns: 8fr 4fr; }
.feature.flip .text { order: 2; }
.feature .text p { color: var(--muted); }

/* Vídeo */
.video { background: var(--bg-soft); text-align: center; }
.video video { margin: 0 auto; border-radius: var(--radius); background: var(--shot-bg); width: 100%; max-width: 960px; }

/* Para quién */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.fit p { color: var(--muted); }
.checks { list-style: none; padding: 0; margin: 0; }
.checks li { padding-left: 30px; position: relative; margin-bottom: 12px; color: var(--muted); }
.checks li::before { content: '✓'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* Contacto */
.contact { text-align: center; background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%); }

/* Pie */
.foot { border-top: 1px solid var(--line); padding: 24px 0; color: var(--muted); font-size: 0.9rem; }
.foot-in { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.foot a { color: var(--muted); }

/* Páginas legales */
.legal { max-width: 760px; }
.legal h1 { font-size: 2rem; }
.legal .todo { background: #fff4c2; color: #5c4a00; padding: 0 4px; border-radius: 3px; }

@media (max-width: 1000px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 820px) {
  .cards { grid-template-columns: 1fr; }
  section { padding: 52px 0; }
  .grid3, .steps, .grid2 { grid-template-columns: 1fr; }
  .feature { grid-template-columns: 1fr; gap: 20px; margin-bottom: 56px; }
  .feature.flip { grid-template-columns: 1fr; }
  .feature.flip .text { order: 0; }
  nav a:not(.btn) { display: none; }
}