:root {
  --bg: #f4f7f6;
  --card-bg: #ffffff;
  --primary: #000000;
  --text: #333;
  --radius: 12px;
  --shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

body {
  font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 20px;
  line-height: 1.6;
}

/* --- NAVEGACIÓN TIPO TECLADO FÍSICO --- */
.main-nav {
  display: flex;
  gap: 15px;
  background: transparent !important;
  padding: 20px 0;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.nav-button {
  background: #ffffff !important;
  color: #000000 !important;
  text-decoration: none;
  font-weight: 800;
  padding: 12px 24px;
  border-radius: 12px;
  border: 2px solid #000000 !important;
  border-bottom: 6px solid #000000 !important; /* Relieve de tecla */
  transition: all 0.1s ease;
  display: inline-block;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 1px;
}

.nav-button:hover {
  transform: translateY(-2px);
  border-bottom-width: 8px !important;
}

/* TECLA PRESIONADA / ACTIVA */
.nav-button.active {
  background: #000000 !important;
  color: #ffffff !important;
  border-bottom: 2px solid #000000 !important; /* Se ve hundida */
  transform: translateY(4px) !important;       /* Baja la posición */
  box-shadow: inset 0 4px 8px rgba(255,255,255,0.2);
}

.nav-button.logout {
  margin-left: auto;
  border-color: #e74c3c !important;
  border-bottom-color: #c0392b !important;
  color: #e74c3c !important;
}

.nav-button.logout:hover {
  background: #fffafa !important;
}

/* --- COMPONENTES --- */
#hello {
  background: var(--primary);
  color: white;
  display: inline-block;
  padding: 6px 16px;
  border-radius: 50px;
  font-weight: bold;
  text-transform: uppercase;
  font-size: 0.7rem;
  margin-bottom: 30px;
}

.card {
  background: var(--card-bg);
  padding: 25px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 25px;
  border: 1px solid rgba(0,0,0,0.08);
}

h2 {
  margin-top: 0;
  font-size: 1.3rem;
  border-left: 6px solid var(--primary);
  padding-left: 15px;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: -0.5px;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 5px;
  font-size: 0.85rem;
  color: #555;
}

input, select, textarea {
  width: 100%;
  padding: 12px;
  margin-bottom: 15px;
  border: 2px solid #eee;
  border-radius: 10px;
  box-sizing: border-box;
  font-size: 1rem;
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--primary);
  outline: none;
}

button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 15px 20px;
  border-radius: 10px;
  font-weight: 800;
  text-transform: uppercase;
  cursor: pointer;
  width: 100%;
  transition: all 0.2s;
  letter-spacing: 1px;
}

button:hover {
  background: #333;
  transform: scale(1.01);
}

#totals {
  background: #f9f9f9;
  padding: 20px;
  border-radius: 12px;
  border: 2px solid #000;
  margin: 15px 0;
  font-weight: 600;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  background: #000;
  color: #fff;
  padding: 12px;
  font-size: 0.75rem;
  text-transform: uppercase;
}

td {
  padding: 12px;
  border-bottom: 1px solid #eee;
  font-size: 0.9rem;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

.small { font-size: 0.8rem; color: #666; }

@media (max-width: 600px) {
  .row { grid-template-columns: 1fr; }
  .nav-button { flex: 1; text-align: center; font-size: 0.7rem; padding: 10px; }
}

.totals-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    background: #e8f5e9;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 20px;
}
.totals-grid p { margin: 5px 0; }