:root {
  --bg: #0d1117;
  --bg-panel: #161b22;
  --bg-elev: #1c2230;
  --borde: #2b3444;
  --texto: #e8edf4;
  --texto-suave: #9aa7bd;
  --acento: #4f8cff;
  --acento-2: #38d39f;
  --acento-fuerte: #6ea8ff;
  --peligro: #ff6b6b;
  --sombra: 0 8px 30px rgba(0, 0, 0, 0.35);
  --radio: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 80% -10%, #1a2540 0%, var(--bg) 55%);
  color: var(--texto);
  min-height: 100vh;
  line-height: 1.55;
}

/* ---------- Barra superior ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 26px;
  border-bottom: 1px solid var(--borde);
  background: rgba(13, 17, 23, 0.7);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-size: 34px;
  width: 58px; height: 58px;
  display: grid; place-items: center;
  background: var(--bg-elev);
  border: 1px solid var(--borde);
  border-radius: 16px;
}
.topbar h1 { margin: 0; font-size: 24px; letter-spacing: 0.2px; }
.topbar h1 .ia {
  background: linear-gradient(90deg, var(--acento), var(--acento-2));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.tagline { margin: 2px 0 0; color: var(--texto-suave); font-size: 14px; }

.modo { display: flex; align-items: center; gap: 10px; }
.modo-label { color: var(--texto-suave); font-size: 13px; }
.switch {
  display: flex; background: var(--bg-elev);
  border: 1px solid var(--borde); border-radius: 12px; padding: 4px;
}
.switch-btn {
  border: 0; background: transparent; color: var(--texto-suave);
  padding: 8px 14px; border-radius: 9px; cursor: pointer;
  font-size: 13px; font-weight: 600; transition: all .15s;
}
.switch-btn.activo { background: var(--acento); color: #fff; }

/* ---------- Layout ---------- */
.grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 22px;
  padding: 26px;
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width: 860px) { .grid { grid-template-columns: 1fr; } }

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--borde);
  border-radius: var(--radio);
  padding: 22px;
  box-shadow: var(--sombra);
}
.panel h2 { margin: 0 0 4px; font-size: 19px; }
.panel h3 { font-size: 15px; margin: 0; }
.ayuda { color: var(--texto-suave); font-size: 14px; margin: 4px 0 16px; }

/* ---------- Formularios ---------- */
label { display: block; font-size: 13px; color: var(--texto-suave); margin: 12px 0 5px; font-weight: 600; }
input[type="text"], textarea {
  width: 100%;
  background: var(--bg-elev);
  border: 1px solid var(--borde);
  color: var(--texto);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}
input[type="text"]:focus, textarea:focus {
  outline: none; border-color: var(--acento-fuerte);
  box-shadow: 0 0 0 3px rgba(79, 140, 255, 0.2);
}

.btn {
  border: 0; cursor: pointer; font-family: inherit; font-weight: 700;
  border-radius: 10px; transition: transform .08s, filter .15s;
}
.btn:active { transform: translateY(1px); }
.btn.primario {
  background: linear-gradient(90deg, var(--acento), var(--acento-fuerte));
  color: #fff; padding: 12px 18px; font-size: 15px; margin-top: 16px; width: 100%;
}
.btn.primario:hover { filter: brightness(1.08); }
.btn.grande { margin-top: 0; width: auto; padding: 13px 26px; white-space: nowrap; }
.btn.mini {
  background: var(--bg-elev); color: var(--texto-suave);
  border: 1px solid var(--borde); padding: 6px 12px; font-size: 12px; font-weight: 600;
}
.btn.mini:hover { color: var(--texto); border-color: var(--acento); }

/* ---------- Lista de documentos ---------- */
.kb-header { display: flex; align-items: center; justify-content: space-between; margin: 22px 0 10px; }
.lista-docs { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.doc-item {
  background: var(--bg-elev); border: 1px solid var(--borde);
  border-radius: 10px; padding: 12px 14px;
  display: flex; align-items: flex-start; justify-content: space-between; gap: 12px;
}
.doc-item .doc-info { min-width: 0; }
.doc-item .doc-titulo { font-weight: 700; font-size: 14px; }
.doc-item .doc-snippet { color: var(--texto-suave); font-size: 12.5px; margin-top: 2px;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.doc-item .doc-meta { color: var(--acento-2); font-size: 11.5px; margin-top: 4px; }
.btn-borrar {
  background: transparent; border: 1px solid var(--borde); color: var(--peligro);
  border-radius: 8px; cursor: pointer; padding: 5px 9px; font-size: 12px; font-weight: 700; flex: none;
}
.btn-borrar:hover { background: rgba(255, 107, 107, 0.12); }
.vacio-msg { color: var(--texto-suave); font-size: 13px; font-style: italic; padding: 10px 2px; }

/* ---------- Preguntas ---------- */
.form-pregunta { display: flex; gap: 10px; margin-bottom: 12px; }
.form-pregunta input { flex: 1; }
.chips-ejemplo { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.chip {
  background: var(--bg-elev); border: 1px solid var(--borde); color: var(--texto-suave);
  border-radius: 20px; padding: 6px 13px; font-size: 12.5px; cursor: pointer;
}
.chip:hover { border-color: var(--acento); color: var(--texto); }

/* ---------- Respuesta ---------- */
.respuesta-box {
  background: var(--bg-elev); border: 1px solid var(--borde);
  border-radius: 12px; padding: 18px 20px; min-height: 160px;
}
.respuesta-box.vacia { display: grid; place-items: center; text-align: center; }
.placeholder { color: var(--texto-suave); font-size: 14px; max-width: 320px; }

.respuesta-titulo { display: flex; align-items: center; gap: 8px; font-size: 13px;
  color: var(--acento-2); font-weight: 700; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 10px; }
.respuesta-texto { font-size: 15.5px; line-height: 1.6; }
.respuesta-texto mark { background: rgba(56, 211, 159, 0.22); color: var(--texto); border-radius: 3px; padding: 0 2px; }

.fuentes-titulo { font-size: 12px; color: var(--texto-suave); text-transform: uppercase;
  letter-spacing: .5px; margin: 18px 0 8px; font-weight: 700; }
.fuentes { display: flex; flex-direction: column; gap: 8px; }
.fuente {
  background: var(--bg-panel); border: 1px solid var(--borde); border-left: 3px solid var(--acento);
  border-radius: 8px; padding: 10px 12px;
}
.fuente .f-top { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.fuente .f-titulo { font-weight: 700; font-size: 13.5px; }
.fuente .f-score { font-size: 11.5px; color: #0d1117; background: var(--acento-2);
  border-radius: 10px; padding: 2px 8px; font-weight: 700; flex: none; }
.fuente .f-texto { color: var(--texto-suave); font-size: 13px; margin-top: 5px; }

.cargando { color: var(--texto-suave); font-size: 14px; display: flex; align-items: center; gap: 10px; }
.spinner { width: 16px; height: 16px; border: 2px solid var(--borde);
  border-top-color: var(--acento); border-radius: 50%; animation: giro .7s linear infinite; }
@keyframes giro { to { transform: rotate(360deg); } }
.aviso { color: var(--peligro); font-size: 14px; }

/* ---------- Pie ---------- */
.pie { text-align: center; color: var(--texto-suave); font-size: 12.5px;
  padding: 18px; border-top: 1px solid var(--borde); margin-top: 10px; }