/* === PALETA MONOCROMÁTICA === */
:root {
  --bg-color: #2b2b2b;         /* gris oscuro de fondo */
  --card-color: #1e1e1e;       /* fondo de tarjetas */
  --input-bg: #3a3a3a;         /* campos de texto */
  --border-color: #444;        /* bordes sutiles */
  --text-color: #f0f0f0;       /* texto principal */
  --muted-text: #b5b5b5;       /* texto secundario */
  --btn-bg: #444;              /* fondo botones */
  --btn-bg-hover: #555;        /* hover botones */
  --danger-color: #d9534f;     /* solo para eliminar */
}

/* === RESET === */
* {
  box-sizing: border-box;
  font-family: 'Inter', 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  display: flex;
  justify-content: center;
  min-height: 100vh;
}

/* === CONTENEDOR PRINCIPAL === */
.container {
  width: 100%;
  max-width: 500px;
  padding: 1rem;
}

/* === TITULO === */
h1 {
  text-align: center;
  font-weight: 500;
  color: var(--text-color);
  margin-bottom: 1.5rem;
}

/* === FORMULARIO === */
form {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin-bottom: 1.5rem;
}

input {
  background-color: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  padding: 0.8rem;
  font-size: 1rem;
  outline: none;
  transition: background 0.2s, border 0.2s;
}

input::placeholder {
  color: var(--muted-text);
}

input:focus {
  border-color: #888;
}

/* === BOTÓN PRINCIPAL === */
button {
  background-color: var(--btn-bg);
  color: var(--text-color);
  border: none;
  border-radius: 6px;
  padding: 0.9rem;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

button:hover {
  background-color: var(--btn-bg-hover);
}

/* === TARJETAS DE PERSONAS === */
.person-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.card {
  background-color: var(--card-color);
  border-radius: 8px;
  padding: 1rem;
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 5px rgba(0,0,0,0.4);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-content {
  flex: 1;
  font-size: 0.95rem;
  line-height: 1.4rem;
}

.card strong {
  color: #fff;
  font-weight: 600;
}

.card small {
  color: var(--muted-text);
}

/* === BOTÓN DE ELIMINAR === */
.delete-btn {
  background-color: var(--danger-color);
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 0.5rem 0.8rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: opacity 0.2s ease;
}

.delete-btn:hover {
  opacity: 0.8;
}

/* === SPINNER === */
.spinner {
  border: 5px solid #3a3a3a;
  border-top: 5px solid #fff;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 15px auto;
}

.hidden {
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* === RESPONSIVO (Mobile First) === */
@media (min-width: 600px) {
  .container {
    padding: 2rem;
  }
}