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

:root {
  --cyan: #00FFFF;
  --magenta: #FF00FF;
  --purple: #8B00FF;
  --dark-bg: #0A0E27;
  --darker-bg: #050709;
  --white: #FFFFFF;
  --gray: #E0E0E0;
  --gray-dark: #808080;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
  color: var(--white);
  min-height: 100vh;
  overflow-x: hidden;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

/* ============================================
   NAVBAR NAVEGACIÓN
   ============================================ */
.navbar {
  display: flex;
  gap: 15px;
  margin-bottom: 20px;
  padding: 15px;
  background: rgba(0, 255, 255, 0.1);
  border-radius: 8px;
  border: 2px solid var(--cyan);
  flex-wrap: wrap;
}

.nav-link {
  padding: 10px 20px;
  background: transparent;
  color: var(--cyan);
  border: 2px solid var(--cyan);
  border-radius: 5px;
  text-decoration: none;
  font-weight: bold;
  transition: all 0.3s ease;
  cursor: pointer;
  text-align: center;
  flex: 1;
  min-width: 100px;
}

.nav-link:hover {
  background: var(--cyan);
  color: var(--dark-bg);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
}

.nav-link.active {
  background: linear-gradient(135deg, var(--magenta) 0%, var(--cyan) 100%);
  color: var(--dark-bg);
  border-color: var(--magenta);
  box-shadow: 0 0 20px rgba(255, 0, 255, 0.4);
}

/* ============================================
   HEADER
   ============================================ */
.header {
  background: linear-gradient(135deg, var(--purple) 0%, var(--magenta) 50%, var(--cyan) 100%);
  padding: 30px 20px;
  border-radius: 10px;
  margin-bottom: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 0 30px rgba(0, 255, 255, 0.3);
}

.header-logo {
  width: 90px;
  height: 90px;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
  object-fit: cover;
  border: 2px solid var(--cyan);
  flex-shrink: 0;
}

.header-content h1 {
  font-size: 2.5em;
  font-weight: bold;
  color: var(--dark-bg);
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.header-content p {
  font-size: 1em;
  color: rgba(10, 14, 39, 0.8);
  margin-top: 5px;
}

.btn-refresh {
  background: var(--dark-bg);
  color: var(--cyan);
  border: 2px solid var(--cyan);
  padding: 10px 15px;
  border-radius: 5px;
  font-size: 1.2em;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-refresh:hover {
  background: var(--cyan);
  color: var(--dark-bg);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
}

/* ============================================
   LAYOUT PRINCIPAL
   ============================================ */
.main-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

.section-title {
  font-size: 1.5em;
  font-weight: bold;
  color: var(--cyan);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--magenta);
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

/* ============================================
   SECCIÓN DE PRODUCTOS
   ============================================ */
.products-section {
  background: rgba(10, 14, 39, 0.8);
  border: 2px solid var(--cyan);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 20px rgba(0, 255, 255, 0.2);
}

.option-group {
  margin-bottom: 25px;
}

.option-group label {
  display: block;
  margin-bottom: 10px;
  font-size: 1.1em;
  font-weight: bold;
  color: var(--magenta);
}

.button-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
}

.button-group.billete-group {
  grid-template-columns: repeat(3, 1fr);
}

.button-group.jeringa-group {
  grid-template-columns: repeat(2, 1fr);
}

.btn-option {
  padding: 12px 15px;
  background: transparent;
  border: 2px solid var(--cyan);
  color: var(--cyan);
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.95em;
  font-weight: bold;
  transition: all 0.3s ease;
}

.btn-option:hover,
.btn-option.active {
  background: var(--cyan);
  color: var(--dark-bg);
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
  transform: scale(1.05);
}

.btn-option.small {
  padding: 10px 12px;
  font-size: 0.9em;
}

.textarea-notas {
  width: 100%;
  padding: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--cyan);
  color: var(--white);
  border-radius: 5px;
  font-size: 0.95em;
  resize: vertical;
  min-height: 80px;
}

.textarea-notas::placeholder {
  color: var(--gray-dark);
}

.textarea-notas:focus {
  outline: none;
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.jeringas-agregadas {
  margin-top: 10px;
  padding: 10px;
  background: rgba(139, 0, 255, 0.1);
  border-left: 3px solid var(--purple);
  border-radius: 3px;
}

.jeringa-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  font-size: 0.95em;
  color: var(--gray);
}

.btn-remove-jeringa {
  background: transparent;
  border: none;
  color: var(--magenta);
  cursor: pointer;
  font-size: 1.2em;
  padding: 0;
}

.btn-remove-jeringa:hover {
  color: red;
}

/* ============================================
   BOTONES PRINCIPALES
   ============================================ */
.btn-primary {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, var(--magenta) 0%, var(--cyan) 100%);
  color: var(--dark-bg);
  border: none;
  border-radius: 5px;
  font-size: 1.1em;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 0 15px rgba(255, 0, 255, 0.3);
  margin-top: 15px;
}

.btn-primary:hover {
  transform: scale(1.02);
  box-shadow: 0 0 25px rgba(255, 0, 255, 0.5);
}

.btn-secondary {
  padding: 12px 20px;
  background: transparent;
  border: 2px solid var(--magenta);
  color: var(--magenta);
  border-radius: 5px;
  font-size: 1em;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: var(--magenta);
  color: var(--dark-bg);
  box-shadow: 0 0 15px rgba(255, 0, 255, 0.5);
}

/* ============================================
   SECCIÓN DEL CARRITO
   ============================================ */
.cart-section {
  background: rgba(10, 14, 39, 0.8);
  border: 2px solid var(--magenta);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 0 20px rgba(255, 0, 255, 0.2);
  position: sticky;
  top: 20px;
  height: fit-content;
}

.cart-items {
  min-height: 200px;
  max-height: 400px;
  overflow-y: auto;
  margin-bottom: 20px;
}

.empty-cart {
  text-align: center;
  color: var(--gray-dark);
  padding: 40px 20px;
  font-size: 1.1em;
}

.cart-item {
  background: rgba(139, 0, 255, 0.1);
  padding: 15px;
  margin-bottom: 10px;
  border-left: 4px solid var(--purple);
  border-radius: 5px;
  display: flex;
  justify-content: space-between;
  align-items: start;
}

.cart-item-info {
  flex: 1;
}

.cart-item-name {
  font-weight: bold;
  color: var(--cyan);
  font-size: 1em;
  margin-bottom: 5px;
}

.cart-item-details {
  font-size: 0.85em;
  color: var(--gray);
  line-height: 1.4;
}

.cart-item-price {
  text-align: right;
  font-weight: bold;
  color: var(--magenta);
  font-size: 1.1em;
}

.btn-remove-item {
  background: transparent;
  border: none;
  color: var(--magenta);
  cursor: pointer;
  font-size: 1.2em;
  padding: 0;
  margin-left: 10px;
}

.btn-remove-item:hover {
  color: red;
}

/* ============================================
   RESUMEN DEL CARRITO
   ============================================ */
.cart-summary {
  background: rgba(0, 255, 255, 0.05);
  padding: 15px;
  border-radius: 5px;
  margin-bottom: 15px;
  border: 1px solid var(--cyan);
}

.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 1.1em;
  font-weight: bold;
}

.summary-row span:first-child {
  color: var(--gray);
}

.summary-row span:last-child {
  color: var(--cyan);
}

.total-price {
  font-size: 1.3em;
  color: var(--magenta);
  text-shadow: 0 0 10px rgba(255, 0, 255, 0.3);
}

.cart-actions {
  display: flex;
  gap: 10px;
}

.cart-actions .btn-secondary {
  flex: 1;
}

.cart-actions .btn-primary {
  flex: 1;
  margin-top: 0;
}

/* ============================================
   MODALES
   ============================================ */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 999;
}

.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background: var(--dark-bg);
  border: 3px solid var(--magenta);
  border-radius: 10px;
  box-shadow: 0 0 40px rgba(255, 0, 255, 0.4);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 2px solid var(--magenta);
  background: linear-gradient(135deg, var(--purple) 0%, var(--magenta) 100%);
}

.modal-header h2 {
  color: var(--dark-bg);
  font-size: 1.5em;
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--dark-bg);
  font-size: 1.5em;
  cursor: pointer;
  padding: 0;
}

.modal-body {
  padding: 20px;
}

.total-a-pagar {
  background: rgba(0, 255, 255, 0.1);
  padding: 20px;
  border-radius: 5px;
  margin-bottom: 25px;
  border: 2px solid var(--cyan);
  text-align: center;
}

.total-a-pagar label {
  display: block;
  color: var(--gray);
  margin-bottom: 10px;
  font-size: 0.95em;
}

.precio-grande {
  font-size: 2.5em;
  font-weight: bold;
  color: var(--magenta);
  text-shadow: 0 0 15px rgba(255, 0, 255, 0.5);
}

.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
}

.input-billete {
  flex: 1;
  padding: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 2px solid var(--cyan);
  color: var(--white);
  border-radius: 5px;
  font-size: 1em;
}

.input-billete::placeholder {
  color: var(--gray-dark);
}

.input-billete:focus {
  outline: none;
  box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.input-group .btn-primary {
  flex: 0 0 auto;
  padding: 12px 20px;
  margin-top: 0;
}

/* ============================================
   RESULTADO DE CAMBIO
   ============================================ */
.resultado-cambio {
  background: rgba(139, 0, 255, 0.1);
  padding: 20px;
  border-radius: 5px;
  border: 2px solid var(--purple);
  margin-top: 20px;
}

.cambio-info {
  margin-bottom: 20px;
}

.cambio-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  font-size: 1.1em;
  font-weight: bold;
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 255, 255, 0.2);
}

.cambio-row span:first-child {
  color: var(--gray);
}

.cambio-row.cambio-final {
  font-size: 1.4em;
  color: var(--magenta);
  border: none;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 2px solid var(--magenta);
}

.cambio-valor {
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

.cambio-message {
  text-align: center;
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 5px;
  font-weight: bold;
  font-size: 1.1em;
}

.cambio-message.correcto {
  background: rgba(0, 255, 0, 0.2);
  color: #00FF00;
  border: 2px solid #00FF00;
}

.cambio-message.insuficiente {
  background: rgba(255, 0, 0, 0.2);
  color: #FF4444;
  border: 2px solid #FF4444;
}

/* ============================================
   ACCIONES DEL MODAL
   ============================================ */
.modal-actions {
  display: flex;
  gap: 10px;
  margin-top: 20px;
}

.modal-actions .btn-secondary {
  flex: 1;
}

.modal-actions .btn-primary {
  flex: 1;
  margin-top: 0;
}

/* ============================================
   SCROLLBAR PERSONALIZADO
   ============================================ */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: rgba(0, 255, 255, 0.05);
}

::-webkit-scrollbar-thumb {
  background: var(--magenta);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--cyan);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .main-content {
    grid-template-columns: 1fr;
  }

  .cart-section {
    position: static;
  }

  .header-content h1 {
    font-size: 2em;
  }

  .navbar {
    flex-direction: row;
  }

  .nav-link {
    flex: 1;
    min-width: auto;
    font-size: 0.9em;
    padding: 8px 12px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }

  .header {
    padding: 20px 15px;
    flex-direction: column;
    gap: 15px;
    text-align: center;
  }

  .header-logo {
    width: 70px;
    height: 70px;
  }

  .header-content h1 {
    font-size: 1.5em;
  }

  .navbar {
    gap: 10px;
  }

  .nav-link {
    padding: 8px 10px;
    font-size: 0.8em;
  }

  .button-group {
    grid-template-columns: repeat(2, 1fr);
  }

  .button-group.billete-group {
    grid-template-columns: repeat(2, 1fr);
  }

  .modal-content {
    width: 95%;
  }

  .section-title {
    font-size: 1.2em;
  }

  .cart-item {
    padding: 10px;
  }

  .cart-item-name {
    font-size: 0.95em;
  }

  .cart-item-price {
    font-size: 1em;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 5px;
  }

  .button-group {
    grid-template-columns: 1fr;
  }

  .button-group.billete-group {
    grid-template-columns: repeat(2, 1fr);
  }

  .header-logo {
    width: 60px;
    height: 60px;
  }

  .header-content h1 {
    font-size: 1.2em;
  }

  .header-content p {
    font-size: 0.9em;
  }

  .navbar {
    gap: 5px;
    padding: 10px;
  }

  .nav-link {
    padding: 6px 8px;
    font-size: 0.7em;
  }

  .precio-grande {
    font-size: 1.8em;
  }

  .btn-option {
    padding: 8px 10px;
    font-size: 0.8em;
  }

  .section-title {
    font-size: 1.1em;
  }

  .cart-item {
    flex-direction: column;
    gap: 10px;
  }

  .pin-input-group {
    gap: 10px;
  }

  .pin-digit {
    width: 50px;
    height: 50px;
    font-size: 1.5em;
  }

  .summary-card {
    flex-direction: column;
    gap: 8px;
  }

  .card-title {
    font-size: 0.9em;
  }

  .card-value {
    font-size: 1.1em;
  }
}