:root {
  --bg: #f8f9fa;         /* fondo general claro */
  --panel: #ffffff;      /* fondo de tarjetas y formularios */
  --border: #e2e5e9;     /* bordes suaves */
  --text: #666;          /* texto principal */
  --muted: #666;         /* texto secundario */
  --accent: #2b6cb0;     /* azul DataDesign */
  --accent-light: rgba(43,108,176,.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  line-height: 1.45;
}


/* ----- CONTENIDO PRINCIPAL ----- */
main {
  width: min(1200px, 100%);
}

/* ----- FORMULARIO DE CONTROLES ----- */
.controls {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.9rem 1.1rem;
  margin: 0 0 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  align-items: end;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

label {
  color: var(--muted);
  font-size: 0.9rem;
}

input[type="number"] {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.65rem;
  color: var(--text);
  font-size: 1rem;
  width: 8rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="number"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

/* ----- BOTONES ----- */
button {
  appearance: none;
  border-radius: 8px;
  padding: 0.55rem 0.95rem;
  cursor: pointer;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.2px;
  transition: all 0.2s;
}

button:hover {
  background: #2c5282;
}

button.ghost {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

button.ghost:hover {
  background: var(--accent-light);
}

/* ----- META TEXTO ----- */
.meta {
  margin: 0.35rem 0 0.9rem;
  color: var(--muted);
  font-size: 0.95rem;
}

/* ----- CONTENEDOR DEL GRÁFICO ----- */
.viz {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.45rem;
  min-height: 520px;
}

/* ----- GRÁFICO SANKEY ----- */
svg#sankey {
  width: 100%;
  height: 900px;
  display: block;
  min-height: 520px;
}

/* Etiquetas de nodos */
svg#sankey text {
  font-size: 11px;
  font-weight: 400;
  fill: #222;
}

/* Enlaces */
path {
  transition: stroke-opacity 0.15s ease, filter 0.15s ease;
}

path:hover {
  stroke-opacity: 0.7;
  filter: drop-shadow(0 0 5px rgba(43,108,176,0.25));
}

/* Tooltip */
.tooltip {
  position: fixed;
  pointer-events: none;
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.92rem;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  transform: translate(-50%, -120%);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transition: opacity 0.12s ease;
}

/* Enlaces generales */
a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}