/* INSECA — Landing institucional. Sin JS, sin recursos externos. */
:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #2f81f7;
  --accent-strong: #1f6feb;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky; top: 0;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; font-size: 1.4rem; letter-spacing: 2px; }
.nav a { color: var(--muted); margin-left: 24px; }
.nav a:hover { color: var(--text); text-decoration: none; }

/* Hero */
.hero { padding: 96px 0; text-align: center; border-bottom: 1px solid var(--border); }
.hero h1 { font-size: 2.6rem; line-height: 1.2; max-width: 820px; margin: 0 auto 20px; }
.lead { font-size: 1.15rem; color: var(--muted); max-width: 680px; margin: 0 auto 32px; }
.btn {
  display: inline-block; background: var(--accent-strong); color: #fff;
  padding: 12px 28px; border-radius: 8px; font-weight: 600;
}
.btn:hover { background: var(--accent); text-decoration: none; }

/* Features */
.features { padding: 72px 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 12px; padding: 28px;
}
.card h2 { font-size: 1.25rem; margin-bottom: 12px; }
.card p { color: var(--muted); }

/* Security */
.security { padding: 72px 0; border-top: 1px solid var(--border); }
.security h2 { margin-bottom: 20px; }
.security ul { list-style: none; max-width: 720px; }
.security li { padding: 10px 0 10px 28px; position: relative; color: var(--muted); }
.security li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 700; }

/* Contact */
.contact { padding: 72px 0; text-align: center; border-top: 1px solid var(--border); }
.contact h2 { margin-bottom: 12px; }
.contact p { color: var(--muted); margin-bottom: 8px; }
.mailto { font-size: 1.2rem; font-weight: 600; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border); padding: 28px 0;
  text-align: center; color: var(--muted); font-size: 0.9rem;
}