:root {
  --navy: #0B1F4E;
  --navy-2: #1e3a5f;
  --green: #8CC63F;
  --blue: #2563eb;
  --blue-soft: #eff4ff;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --bg: #f5f7fb;
  --card: #ffffff;
}
@media (prefers-color-scheme: dark) {
  :root { --ink: #e2e8f0; --muted: #94a3b8; --line: #2a3650; --bg: #0b1324; --card: #111b30; --blue-soft: #16244a; }
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', Arial, sans-serif; background: var(--bg); color: var(--ink); line-height: 1.55; }
.wrap { max-width: 980px; margin: 0 auto; padding: 0 16px; }
.hero { background: linear-gradient(135deg, var(--navy), var(--navy-2)); color: #fff; padding: 40px 0 36px; }
.hero .brand { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--green); font-weight: 700; margin-bottom: 8px; }
.hero h1 { font-size: 28px; line-height: 1.2; margin-bottom: 8px; }
.hero p { color: rgba(255,255,255,.75); max-width: 640px; }
.hero a.back { color: rgba(255,255,255,.7); font-size: 13px; text-decoration: none; display: inline-block; margin-bottom: 14px; }
.section-title { font-size: 18px; margin: 28px 0 14px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; display: block; color: inherit; text-decoration: none; }
.card h3 { font-size: 16px; margin: 8px 0 6px; }
.card p { font-size: 13px; color: var(--muted); }
.card.link:hover { border-color: var(--blue); }
.card.off { opacity: .6; }
.tag { display: inline-block; font-size: 11px; font-weight: 700; padding: 2px 10px; border-radius: 20px; background: var(--line); color: var(--muted); }
.tag-blue { background: var(--blue-soft); color: var(--blue); }
.foot { color: var(--muted); font-size: 12px; padding: 32px 16px; text-align: center; }

/* Anteproyecto */
.doc section { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 22px; margin: 18px 0; }
.doc h2 { font-size: 19px; margin-bottom: 10px; }
.doc h3 { font-size: 15px; margin: 16px 0 6px; }
.doc p { margin-bottom: 10px; }
.doc ul, .doc ol { margin: 0 0 10px 20px; }
.doc li { margin-bottom: 4px; }
.doc code { font-family: Consolas, monospace; font-size: 13px; background: var(--bg); padding: 1px 6px; border-radius: 4px; }
.doc .lead { font-size: 15px; }
.table-wrap { overflow-x: auto; margin: 10px 0; }
.doc table { width: 100%; border-collapse: collapse; font-size: 13px; }
.doc th, .doc td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.doc th { color: var(--muted); font-weight: 600; white-space: nowrap; }
.diagram { overflow-x: auto; margin: 8px 0 12px; }
.diagram svg { width: 100%; min-width: 600px; height: auto; display: block; }
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.toc a { color: #fff; font-size: 12px; text-decoration: none; border: 1px solid rgba(255,255,255,.3); border-radius: 20px; padding: 3px 12px; }
.check li { list-style: none; margin-left: -20px; }
.check li::before { content: "☐ "; color: var(--muted); }

/* Colores del SVG (claro/oscuro) */
.diagram { --d-ink: var(--ink); --d-muted: var(--muted); --d-edge: #a8a29e; --d-accent: var(--blue); --d-tint: rgba(37,99,235,.10); --d-zone: rgba(100,116,139,.08); }