*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface2: #f1f5f9;
  --border: #e2e8f0;
  --border2: #cbd5e1;
  --text: #0f172a;
  --text2: #475569;
  --text3: #94a3b8;
  --accent: #6366f1;
  --accent-light: #e0e7ff;
  --accent-hover: #4f46e5;
  --green: #16a34a;
  --green-bg: #dcfce7;
  --red: #dc2626;
  --red-bg: #fee2e2;
  --warn: #d97706;
  --warn-bg: #fef3c7;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.1);
}

body {
  font-family: Inter, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── HEADER ── */
.header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 0 var(--border);
}

.header-left { display: flex; align-items: center; gap: 32px; }

.header-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-decoration: none;
  flex-shrink: 0;
}
.header-logo img { height: 34px; width: auto; display: block; }
.header-logo-tag {
  font-size: 9px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: .12em;
  text-transform: uppercase;
}

/* ── HEADER NAV ── */
.header-nav { display: flex; align-items: center; gap: 4px; }
.nav-btn {
  padding: 7px 14px;
  border-radius: 8px;
  border: none;
  background: none;
  color: var(--text2);
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background .15s, color .15s;
  white-space: nowrap;
}
.nav-btn:hover { background: var(--surface2); color: var(--text); }
.nav-btn.active { background: var(--accent-light); color: var(--accent); }

.header-right { display: flex; align-items: center; gap: 12px; }

/* ── AUTH BUTTON ── */
.btn-auth {
  background: #3b82f6;
  color: white;
  border: none;
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background .15s;
  white-space: nowrap;
}
.btn-auth:hover { background: #2563eb; }
.btn-auth.signed-in { background: var(--surface2); color: var(--text2); border: 1px solid var(--border2); }
.btn-auth.signed-in:hover { background: var(--border); }

/* ── LAYOUT ── */
.container { max-width: 860px; margin: 0 auto; padding: 28px 16px 60px; }

/* ── SECTION TITLE ── */
.section-header { margin-bottom: 24px; }
.section-title { font-size: 18px; font-weight: 800; color: var(--text); }
.section-sub { font-size: 13px; color: var(--text2); margin-top: 4px; }

/* ── FORM FIELDS ── */
label { display: block; font-size: 12px; font-weight: 700; color: var(--text2); margin-bottom: 5px; text-transform: uppercase; letter-spacing: .04em; }
select, input[type=text], input[type=file], textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border2);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
input[type=file] { padding: 6px 10px; cursor: pointer; }
select:focus, input:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}
textarea { resize: vertical; min-height: 70px; }
.field { margin-bottom: 14px; }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.row-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 14px; }

/* ── CARDS ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.card-title {
  font-weight: 700;
  font-size: 11px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ── CONFIG SUB-TABS ── */
.sub-tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
.sub-tab-btn {
  padding: 9px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  color: var(--text2);
  cursor: pointer;
  transition: color .15s, border-color .15s;
  margin-bottom: -1px;
}
.sub-tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.sub-tab-btn:hover:not(.active) { color: var(--text); }
.sub-tab-panel { display: none; }
.sub-tab-panel.active { display: block; }

/* ── MODO SELECTOR ── */
.modo-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 6px; }
.modo-card {
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 14px 10px;
  cursor: pointer;
  text-align: center;
  transition: border-color .15s, background .15s;
  background: var(--surface);
}
.modo-card:hover { border-color: var(--border2); background: var(--surface2); }
.modo-card.selected { border-color: var(--accent); background: var(--accent-light); }
.modo-card .modo-icon { font-size: 20px; margin-bottom: 4px; }
.modo-card .modo-label { font-size: 13px; font-weight: 600; color: var(--text); }
.modo-card .modo-desc { font-size: 11px; color: var(--text2); margin-top: 2px; }
.modo-panel { display: none; }
.modo-panel.visible { display: block; }

/* ── BOTONES ── */
.btn {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border2);
  background: var(--surface2);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  transition: background .15s;
}
.btn:hover { background: var(--border); }
.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 28px;
}
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }
.btn-primary:disabled { opacity: .55; cursor: not-allowed; }
.btn-sm { padding: 5px 14px; font-size: 12px; }
.btn-danger { color: var(--red); border-color: #fca5a5; }
.btn-danger:hover { background: var(--red-bg); }
.btn-green { background: var(--green); color: white; border-color: var(--green); }
.btn-green:hover { background: #15803d; }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }

/* ── RESULTADOS ── */
.result-box {
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: 16px;
  padding: 22px;
  margin-top: 20px;
}
.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  flex-wrap: wrap;
  gap: 8px;
}
.result-title { font-weight: 700; font-size: 15px; }
.result-meta { display: flex; gap: 6px; flex-wrap: wrap; }
.badge {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
  background: var(--surface2);
  color: var(--text2);
  border: 1px solid var(--border);
}
.badge-accent { background: var(--accent-light); color: var(--accent); border-color: #c7d2fe; }

/* ── BLOQUES EJERCICIO ── */
.bloque-texto { margin-bottom: 10px; line-height: 1.65; }
.bloque-apartado {
  margin-bottom: 8px;
  padding-left: 16px;
  border-left: 3px solid var(--accent);
  line-height: 1.65;
}
.bloque-latex { margin: 10px 0; overflow-x: auto; text-align: center; padding: 8px 0; }
.bloque-titulo { font-weight: 700; font-size: 15px; margin-bottom: 10px; }

/* ── EJERCICIOS BANCO ── */
.ejercicio-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 14px 16px;
  box-shadow: var(--shadow);
  margin-bottom: 10px;
}
.ejercicio-card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.ejercicio-card-meta { font-size: 12px; color: var(--text2); margin-top: 4px; }
.ejercicio-card-preview {
  margin-top: 10px;
  font-size: 13px;
  color: var(--text2);
  line-height: 1.5;
  display: none;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}
.ejercicio-card-preview.open { display: block; }

/* ── LISTA ITEMS (normativas, grupos, instrucciones) ── */
.item-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.item-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: var(--shadow);
}
.item-card-body { flex: 1; min-width: 0; }
.item-card-title { font-weight: 600; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item-card-sub { font-size: 12px; color: var(--text2); margin-top: 2px; }
.item-card-actions { display: flex; gap: 6px; flex-shrink: 0; }

/* Badge de estado */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}
.status-badge.ok { background: var(--green-bg); color: var(--green); }
.status-badge.pending { background: var(--warn-bg); color: var(--warn); }

/* ── BÚSQUEDA REFERENCIA ── */
.ref-list {
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border2);
  border-radius: 10px;
  margin-top: 8px;
}
.ref-item {
  padding: 9px 12px;
  cursor: pointer;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  transition: background .1s;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.ref-item:last-child { border-bottom: none; }
.ref-item:hover { background: var(--surface2); }
.ref-item.selected { background: var(--accent-light); }
.ref-item-title { font-weight: 500; color: var(--text); }
.ref-item-sub { font-size: 11px; color: var(--text3); }
.ref-preview {
  margin-top: 10px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  font-size: 13px;
  line-height: 1.6;
  display: none;
}
.ref-preview.visible { display: block; }

/* ── LOGO PREVIEW ── */
.logo-preview {
  width: 120px;
  height: 80px;
  border: 2px dashed var(--border2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--surface2);
  margin-bottom: 10px;
}
.logo-preview img { max-width: 100%; max-height: 100%; object-fit: contain; }
.logo-placeholder { font-size: 11px; color: var(--text3); text-align: center; padding: 8px; }

/* ── CRITERIOS PREVIEW ── */
.criterios-box {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin-top: 14px;
  max-height: 320px;
  overflow-y: auto;
}
.criterio-item {
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}
.criterio-item:last-child { border-bottom: none; }
.criterio-codigo { font-weight: 700; color: var(--accent); margin-right: 6px; font-size: 12px; }

/* ── SPINNER ── */
.spinner {
  display: inline-block;
  width: 15px; height: 15px;
  border: 2px solid #c7d2fe;
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── TOAST ── */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #1e293b;
  color: white;
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  transition: opacity .2s, transform .2s;
  z-index: 999;
  pointer-events: none;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ── EMPTY STATE ── */
.empty-state { text-align: center; padding: 40px 20px; color: var(--text3); }
.empty-state svg { margin-bottom: 12px; opacity: .4; }
.empty-state p { font-size: 14px; }

/* ── SEPARADOR ── */
.sep { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ── AUTH GUARD ── */
.auth-guard {
  background: var(--warn-bg);
  border: 1px solid #fde68a;
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 13px;
  color: var(--warn);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

/* ── MODAL (edición inline) ── */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,.35);
  z-index: 200;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--surface);
  border-radius: 16px;
  padding: 24px;
  width: 100%;
  max-width: 480px;
  box-shadow: var(--shadow-md);
}
.modal-title { font-weight: 700; font-size: 16px; margin-bottom: 18px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px; }

/* ── Exam builder ── */
.btn-num-q { padding:5px 10px;border:1px solid var(--border);border-radius:6px;background:var(--surface2);color:var(--text1);cursor:pointer;font-size:13px;transition:all .15s; }
.btn-num-q:hover { border-color:var(--accent);color:var(--accent); }
.btn-num-q.active { background:var(--accent);color:#fff;border-color:var(--accent); }
.check-label { display:flex;align-items:center;gap:6px;font-size:13px;cursor:pointer;user-select:none; }
.check-label input { accent-color:var(--accent); }
.pregunta-row { border:1px solid var(--border);border-radius:10px;margin-bottom:10px;overflow:hidden;background:var(--surface1); }
.pregunta-row-header { display:flex;align-items:center;gap:10px;padding:10px 14px;cursor:pointer;background:var(--surface2);user-select:none; }
.pregunta-row-header:hover { background:var(--surface3,#f0f0f0); }
.pregunta-num { font-weight:600;font-size:13px;flex:1; }
.pregunta-origen-badge { font-size:11px;padding:2px 7px;border-radius:20px;background:var(--accent-light,#e8f0fe);color:var(--accent);font-weight:500; }
.drag-handle { cursor:grab;color:var(--text3);font-size:16px;line-height:1; }
.drag-handle:active { cursor:grabbing; }
.pregunta-row-body { padding:14px;display:none; }
.pregunta-row-body.open { display:block; }
.origen-tabs { display:flex;gap:4px;flex-wrap:wrap;margin-bottom:14px; }
.origen-tab { padding:5px 11px;border:1px solid var(--border);border-radius:20px;font-size:12px;cursor:pointer;background:var(--surface2); }
.origen-tab.active { background:var(--accent);color:#fff;border-color:var(--accent); }
.origen-panel { display:none; }
.origen-panel.active { display:block; }
.dificultad-btns { display:flex;gap:6px;flex-wrap:wrap; }
.dif-btn { padding:4px 10px;border:1px solid var(--border);border-radius:16px;font-size:12px;cursor:pointer;background:var(--surface2); }
.dif-btn.active { font-weight:600; }
.dif-btn[data-dif="basico"].active { background:#d1fae5;border-color:#10b981;color:#065f46; }
.dif-btn[data-dif="medio"].active { background:#fef3c7;border-color:#f59e0b;color:#92400e; }
.dif-btn[data-dif="alto"].active { background:#fee2e2;border-color:#ef4444;color:#991b1b; }
.dif-btn[data-dif="pevau"].active { background:#ede9fe;border-color:#8b5cf6;color:#5b21b6; }
.tipo-btns { display:flex;gap:6px;margin-bottom:12px; }
.tipo-btn { padding:5px 12px;border:1px solid var(--border);border-radius:6px;font-size:12px;cursor:pointer;background:var(--surface2); }
.tipo-btn.active { background:var(--accent);color:#fff;border-color:var(--accent); }
.partes-competencial { margin-top:10px; }
.parte-row { display:flex;gap:8px;align-items:center;margin-bottom:6px; }
.parte-row label { font-size:12px;white-space:nowrap;width:60px;flex-shrink:0; }
/* Exam result */
.examen-pregunta-preview { margin-bottom:24px;padding-bottom:24px;border-bottom:1px solid var(--border); }
.examen-pregunta-preview:last-child { border-bottom:none; }
.examen-pq-header { display:flex;align-items:center;gap:10px;margin-bottom:10px; }
.examen-pq-num { font-weight:700;font-size:15px; }
.examen-pq-meta { font-size:11px;color:var(--text3);background:var(--surface2);padding:2px 8px;border-radius:12px; }
.criterios-acordeon { margin-top:8px; }
.criterios-acordeon summary { font-size:12px;color:var(--accent);cursor:pointer;user-select:none; }
.criterio-row { display:flex;justify-content:space-between;align-items:flex-start;padding:4px 0;border-bottom:1px solid var(--border);font-size:12px; }
.criterio-row:last-child { border:none; }
.latex-copy-btn { font-size:11px;padding:2px 7px;border:1px solid var(--border);border-radius:4px;background:var(--surface2);cursor:pointer;white-space:nowrap; }
.latex-acordeon { margin-top:8px; }
.latex-acordeon summary { font-size:12px;color:var(--text2);cursor:pointer;user-select:none;display:flex;align-items:center;gap:6px; }
.latex-acordeon summary::marker { content:''; }
.latex-acordeon[open] summary { color:var(--accent); }
.latex-pre { background:#1e293b;color:#e2e8f0;padding:10px 12px;border-radius:6px;font-size:11px;font-family:monospace;white-space:pre-wrap;word-break:break-all;margin-top:6px;max-height:200px;overflow-y:auto; }
/* Tooltip hover */
#ex-tooltip { position:fixed;z-index:9999;background:var(--surface);border:1px solid var(--border2);border-radius:8px;box-shadow:var(--shadow-md);padding:12px 14px;max-width:360px;font-size:12px;pointer-events:none;display:none; }
/* IA config */
.ia-provider-card { border:1px solid var(--border);border-radius:10px;padding:14px;margin-bottom:12px;background:var(--surface2); }
.ia-provider-header { display:flex;justify-content:space-between;align-items:center;margin-bottom:12px; }
.ia-provider-logo { width:32px;height:32px;border-radius:8px;background:#4285f4;color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px; }
.ia-task-row { display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid var(--border); }
.ia-task-row:last-of-type { border:none; }
.ia-task-label { flex:1;margin-right:16px; }
/* Banco mejorado */
.banco-tabs { display:flex;gap:8px;margin-bottom:16px;border-bottom:1px solid var(--border);padding-bottom:8px; }
.banco-tab { padding:6px 14px;border-radius:6px;font-size:13px;cursor:pointer;background:none;border:none;color:var(--text2); }
.banco-tab.active { background:var(--accent);color:#fff; }
.valoracion-btns { display:flex;gap:4px; }
.val-btn { padding:3px 7px;border-radius:4px;border:1px solid var(--border);background:var(--surface2);cursor:pointer;font-size:13px; }
.val-btn.active-up { background:#d1fae5;border-color:#10b981; }
.val-btn.active-down { background:#fee2e2;border-color:#ef4444; }

@media (max-width: 640px) {
  .header { padding: 0 16px; }
  .header-left { gap: 16px; }
  .nav-btn { padding: 6px 10px; font-size: 13px; }
  .row-2, .row-3 { grid-template-columns: 1fr; }
  .modo-grid { grid-template-columns: 1fr; }
  .container { padding: 16px 12px 60px; }
  .ia-task-row { flex-direction:column;align-items:flex-start;gap:8px; }
}
@keyframes spin { to { transform: rotate(360deg); } }