:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --text: #1a1a1a;
  --text-muted: #6b6b6b;
  --accent: #d64545;
  --border: #e2e2e2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --bg-alt: #212226;
    --text: #f0f0f0;
    --text-muted: #a0a0a0;
    --border: #3a3b3f;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

#pantalla-login {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 16px;
  text-align: center;
}
#pantalla-login p { color: var(--text-muted); max-width: 420px; }

button {
  font: inherit;
  cursor: pointer;
}
#btn-login {
  padding: 12px 24px;
  border-radius: 8px;
  border: none;
  background: var(--accent);
  color: white;
  font-size: 1rem;
}

#app {
  display: none;
  min-height: 100vh;
}
#sidebar {
  width: 260px;
  flex-shrink: 0;
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  padding: 16px;
  display: flex;
  flex-direction: column;
}
#sidebar h2 { margin: 0 0 4px; }
#sidebar .caption { color: var(--text-muted); font-size: 0.8rem; margin-bottom: 16px; }
#nav-paginas { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-btn {
  text-align: left;
  padding: 8px 10px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text);
}
.nav-btn:not(:disabled):hover { background: var(--border); }
.nav-btn:disabled { color: var(--text-muted); cursor: not-allowed; }
.nav-btn.activo { background: var(--accent); color: white; }
#btn-logout {
  margin-top: 12px;
  padding: 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
}

#contenido { flex: 1; padding: 24px 32px; max-width: 1100px; }
#contenido h1 { margin-top: 0; }
#contenido h4 { margin-top: 28px; margin-bottom: 8px; }
.caption { color: var(--text-muted); font-size: 0.9rem; }

.campo { margin: 16px 0; }
.radio-row { display: flex; gap: 16px; margin-top: 6px; flex-wrap: wrap; }
.row { display: flex; gap: 8px; margin-top: 8px; flex-wrap: wrap; }
select, .input-texto, input[type="number"], input[type="date"], input[type="text"], input[type="file"] {
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
}
.input-texto { width: 100%; margin-top: 10px; }
.checkbox-row { display: flex; align-items: center; gap: 6px; margin-top: 12px; }

#form_declaracion .row > div { flex: 1; min-width: 180px; }
#form_declaracion input[type="number"], #form_declaracion input[type="date"] { width: 100%; margin-top: 4px; }
#form_declaracion button[type="submit"] {
  margin-top: 16px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  background: var(--accent);
  color: white;
  font-weight: 600;
}
#form_declaracion button[type="submit"]:disabled { opacity: 0.6; }

.tabs { display: flex; gap: 4px; margin: 16px 0; flex-wrap: wrap; border-bottom: 1px solid var(--border); }
.tab-btn {
  padding: 8px 14px;
  border: none;
  border-radius: 6px 6px 0 0;
  background: transparent;
  color: var(--text-muted);
}
.tab-btn:hover { background: var(--bg-alt); }
.tab-btn.activo { background: var(--bg-alt); color: var(--text); font-weight: 600; }

.tabla-scroll { max-height: 600px; overflow-y: auto; overflow-x: auto; margin-top: 8px; border: 1px solid var(--border); border-radius: 8px; }
.tabla-scroll .tabla { margin-top: 0; }
.tabla-scroll thead th { position: sticky; top: 0; background: var(--bg); }

h5 { margin: 20px 0 8px; }

.col-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 12px; }
.col-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; margin-top: 12px; }
@media (max-width: 700px) {
  .col-2, .col-3 { grid-template-columns: 1fr; }
}
@media (min-width: 701px) and (max-width: 1000px) {
  .col-3 { grid-template-columns: 1fr 1fr; }
}

.metric-row { display: flex; gap: 16px; flex-wrap: wrap; }
.metric {
  background: var(--bg-alt);
  border-radius: 8px;
  padding: 12px 16px;
  min-width: 180px;
  flex: 1;
}
.metric-label { color: var(--text-muted); font-size: 0.85rem; }
.metric-value { font-size: 1.5rem; font-weight: 600; margin-top: 4px; }

.aviso {
  margin-top: 24px;
  padding: 12px 16px;
  border-radius: 8px;
  background: #fff3cd;
  color: #664d03;
}
@media (prefers-color-scheme: dark) {
  .aviso { background: #4a3b0a; color: #ffe69c; }
}
.ok {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 8px;
  background: #d1e7dd;
  color: #0f5132;
}
@media (prefers-color-scheme: dark) {
  .ok { background: #0f3d2a; color: #a3d9b8; }
}
.error { color: var(--accent); }

.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  margin: 12px 0;
}

h6 { margin: 16px 0 4px; font-size: 0.85rem; color: var(--text-muted); text-transform: none; }

details { margin: 12px 0; }
details summary { cursor: pointer; color: var(--accent); font-weight: 500; }
.tabla { border-collapse: collapse; width: 100%; margin-top: 8px; font-size: 0.9rem; }
.tabla th, .tabla td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--border); }
.tabla th { color: var(--text-muted); font-weight: 500; }

@media (max-width: 700px) {
  #app { flex-direction: column; }
  #sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); }
  #contenido { padding: 16px; }
}