/* Reset básico */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg1: #667eea;
  --bg2: #764ba2;
  --card: #ffffff;
  --text: #222;
  --muted: #666;
  --border: #e0e0e0;
  --accent: #667eea;
  --danger: #dc3545;
  --warn: #ff9800;
  --late: #e53935;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--bg1) 0%, var(--bg2) 100%);
  min-height: 100vh;
  padding: 40px 20px;
  color: var(--text);
}

.container {
  max-width: 720px;
  margin: 0 auto;
  background: var(--card);
  border-radius: 16px;
  padding: 26px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

h1 {
  color: #333;
  font-size: 2rem;
}

/* Botón tema */
.tema {
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  background: #111;
  color: #fff;
  font-size: 0.95rem;
}

/* Formulario */
#form-tarea {
  display: grid;
  grid-template-columns: 1fr 160px 160px 110px;
  gap: 10px;
  margin-bottom: 16px;
}

#input-tarea,
#input-fecha,
#input-categoria {
  padding: 12px 14px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
  transition: border-color 0.2s;
  background: #fff;
}

#input-tarea:focus,
#input-fecha:focus,
#input-categoria:focus {
  outline: none;
  border-color: var(--accent);
}

#form-tarea button {
  padding: 12px 16px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

#form-tarea button:hover {
  background: #5a67d8;
}

/* Barra filtros */
.barra-filtros {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

/* Filtros */
.filtros {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.filtro {
  padding: 8px 14px;
  background: #f0f0f0;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.9rem;
}

.filtro:hover {
  background: #e0e0e0;
}

.filtro.activo {
  background: var(--accent);
  color: white;
}

/* Filtro categoría */
.filtro-categoria {
  padding: 10px 12px;
  border: 2px solid var(--border);
  border-radius: 10px;
  background: #fff;
  cursor: pointer;
}

/* Lista */
#lista-tareas {
  list-style: none;
}

.tarea {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px;
  background: #f8f9fa;
  border-radius: 12px;
  margin-bottom: 10px;
  transition: background 0.2s, transform 0.2s;
  position: relative;
}

.tarea:hover {
  background: #f0f0f0;
  transform: translateX(4px);
}

.tarea.completada {
  opacity: 0.65;
}

.tarea.completada .tarea-texto {
  text-decoration: line-through;
  color: #999;
}

/* Etiquetas de estado */
.tarea.por-vencer {
  border-left: 6px solid var(--warn);
}

.tarea.vencida {
  border-left: 6px solid var(--late);
}

/* Checkbox */
.tarea input[type="checkbox"] {
  width: 20px;
  height: 20px;
  cursor: pointer;
  accent-color: var(--accent);
}

/* Contenido tarea */
.tarea-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.tarea-texto {
  font-size: 1rem;
  color: #333;
  word-break: break-word;
}

.meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.categoria {
  padding: 2px 10px;
  border-radius: 999px;
  background: #eee;
  color: #333;
  font-size: 0.8rem;
  text-transform: capitalize;
}

.fecha {
  color: var(--muted);
  font-size: 0.85rem;
}

/* Acciones */
.acciones {
  display: flex;
  gap: 8px;
  align-items: center;
}

.btn-editar,
.btn-guardar,
.btn-cancelar,
.btn-eliminar {
  border: none;
  background: none;
  cursor: pointer;
  font-size: 1.15rem;
  padding: 6px;
  border-radius: 10px;
  transition: background 0.2s;
}

.btn-editar:hover,
.btn-guardar:hover,
.btn-cancelar:hover {
  background: rgba(0, 0, 0, 0.06);
}

.btn-eliminar {
  color: var(--danger);
}

.btn-eliminar:hover {
  background: rgba(220, 53, 69, 0.12);
}

/* Edit inline */
.editar-input {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 1rem;
}

.editar-input:focus {
  outline: none;
  border-color: var(--accent);
}

/* Contador */
.contador {
  text-align: center;
  color: var(--muted);
  margin-top: 16px;
  font-size: 0.95rem;
}

/* Mensaje sin tareas */
.sin-tareas {
  text-align: center;
  color: #999;
  padding: 26px;
  font-style: italic;
}

/* Animación de entrada */
@keyframes aparecer {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.tarea {
  animation: aparecer 0.22s ease;
}

/* Animación antes de eliminar */
@keyframes salir {
  to {
    opacity: 0;
    transform: translateX(25px);
    height: 0;
    margin: 0;
    padding-top: 0;
    padding-bottom: 0;
  }
}

.tarea.saliendo {
  animation: salir 0.25s ease forwards;
}

/* Responsive */
@media (max-width: 700px) {
  #form-tarea {
    grid-template-columns: 1fr 1fr;
  }
  #form-tarea button {
    grid-column: span 2;
  }
}

/* ===== Dark mode ===== */
body.dark {
  background: #0f172a;
}

body.dark .container {
  background: #111827;
  color: #e5e7eb;
}

body.dark h1 { color: #e5e7eb; }

body.dark #input-tarea,
body.dark #input-fecha,
body.dark #input-categoria,
body.dark .filtro-categoria,
body.dark .editar-input {
  background: #0b1220;
  color: #e5e7eb;
  border-color: #334155;
}

body.dark .tarea {
  background: #0b1220;
}

body.dark .tarea:hover {
  background: #0f1b33;
}

body.dark .filtro {
  background: #1f2937;
  color: #e5e7eb;
}

body.dark .filtro.activo {
  background: var(--accent);
  color: #fff;
}

body.dark .categoria {
  background: #1f2937;
  color: #e5e7eb;
}

body.dark .fecha,
body.dark .contador {
  color: #cbd5e1;
}

body.dark .tema {
  background: #e5e7eb;
  color: #111;
}