:root {
  --fg: #1d2733;
  --muted: #55606e;
  --bg: #f6f8fa;
  --card: #ffffff;
  --line: #d5dce4;
  --accent: #0b5a45;
  --accent-bg: #e4f2ed;
  --warn-bg: #fff6dc;
  --err: #a1261a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.55;
}

header.site, footer.site, main {
  max-width: 880px;
  margin: 0 auto;
  padding: 16px;
}

header.site { display: flex; flex-wrap: wrap; gap: 8px 20px; align-items: baseline; justify-content: space-between; }
header.site .brand { font-weight: 700; font-size: 1.1rem; color: var(--accent); text-decoration: none; }
nav a { margin-right: 14px; color: var(--accent); font-size: 0.95rem; }

h1 { font-size: 1.6rem; line-height: 1.25; margin: 8px 0 8px; }
h2 { font-size: 1.2rem; margin: 24px 0 8px; }
h3 { font-size: 1.05rem; margin: 16px 0 6px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  margin: 14px 0;
}

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px 16px; }

label { display: block; font-weight: 600; font-size: 0.92rem; margin-bottom: 4px; }
.hint { font-weight: 400; color: var(--muted); font-size: 0.82rem; display: block; }

input, select, button {
  font: inherit;
  width: 100%;
  padding: 9px 10px;
  border: 1px solid #a9b4c0;
  border-radius: 6px;
  background: #fff;
  color: var(--fg);
}

button {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 700;
  cursor: pointer;
  width: auto;
  padding: 10px 22px;
}

button:hover { filter: brightness(1.1); }
input:focus, select:focus, button:focus, summary:focus { outline: 3px solid #86c5b0; outline-offset: 1px; }

.errores { background: #fdeceb; border: 1px solid #e3a29c; color: var(--err); border-radius: 6px; padding: 10px 14px; margin: 12px 0; }
.errores ul { margin: 0; padding-left: 20px; }

table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); vertical-align: top; }
td.monto, th.monto { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
td .art { display: block; color: var(--muted); font-size: 0.8rem; }
tr.total td { font-weight: 700; border-top: 2px solid var(--fg); border-bottom: none; }

.aviso { background: var(--warn-bg); border: 1px solid #e6cf85; border-radius: 6px; padding: 10px 14px; margin: 14px 0; font-size: 0.92rem; }
.nota { color: var(--muted); font-size: 0.88rem; }
.resumen { background: var(--accent-bg); border-radius: 8px; padding: 12px 16px; font-size: 1.15rem; font-weight: 700; margin: 10px 0; }

details { margin: 12px 0; }
summary { cursor: pointer; font-weight: 700; color: var(--accent); }
details ol { padding-left: 20px; }

code, .formula { background: #eef2f6; padding: 2px 6px; border-radius: 4px; font-family: ui-monospace, Consolas, monospace; font-size: 0.9rem; }
.formula { display: block; padding: 10px 12px; margin: 8px 0; overflow-x: auto; }

a { color: var(--accent); }
footer.site { color: var(--muted); font-size: 0.85rem; border-top: 1px solid var(--line); margin-top: 28px; }