:root {
  /* TripResale Brand Colors */
  --tripresale-primary: #12152A;  /* Azul marino del logo */
  --tripresale-secondary: #2a4a6b;
  --tripresale-accent: #4a90e2;
  --tripresale-success: #48bb78;
  --tripresale-white: #ffffff;
  --tripresale-gray-light: #f7fafc;
  --tripresale-gray-medium: #cbd5e0;
  --tripresale-gray-dark: #4a5568;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;

  /* Spacing */
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;

  /* Border radius */
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family);
  background-color: var(--tripresale-primary); /* Fondo azul marino */
  color: var(--tripresale-white);
  line-height: 1.6;
  overflow-x: hidden;
}

.app-container {
  min-height: 100vh;
  background-color: var(--tripresale-primary);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

/* Header */
.header {
  background: var(--tripresale-primary);
  color: var(--tripresale-white);
  padding: var(--spacing-4) 0;
  box-shadow: var(--shadow-md);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

/* Logo TripResale Real */
.logo-img {
  width: 60px;
  height: auto;
  border-radius: var(--radius-md);
  background-color: transparent;
  padding: 4px;
  filter: brightness(1.1) contrast(1.2);
  box-shadow: none;
}

.logo-text h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0;
  color: var(--tripresale-white);
}

.logo-subtitle {
  color: var(--tripresale-accent);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.page-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin: 0;
  color: var(--tripresale-white);
}

/* Calculator Main */
.calculator-main {
  padding: var(--spacing-8) 0;
  min-height: calc(100vh - 100px);
  background-color: var(--tripresale-primary);
}

.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-8);
  align-items: start;
}

/* Card Styles */
.card {
  background: var(--tripresale-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  margin-bottom: var(--spacing-6);
}

.card-header {
  background: var(--tripresale-primary);
  color: var(--tripresale-white);
  padding: var(--spacing-4) var(--spacing-6);
}

.card-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin: 0;
}

.card-body {
  padding: var(--spacing-6);
  color: var(--tripresale-gray-dark);
}

/* Form Styles */
.form-group {
  margin-bottom: var(--spacing-6);
}

.form-label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-2);
  color: var(--tripresale-primary);
  font-size: var(--font-size-sm);
}

.form-control {
  width: 100%;
  padding: var(--spacing-3);
  border: 2px solid var(--tripresale-gray-medium);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
  background-color: var(--tripresale-white);
  color: var(--tripresale-gray-dark);
}

.form-control:focus {
  outline: none;
  border-color: var(--tripresale-accent);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

/* Slider Styles */
.slider {
  width: 100%;
  height: 8px;
  border-radius: var(--radius-md);
  background: var(--tripresale-gray-medium);
  outline: none;
  -webkit-appearance: none;
  margin: var(--spacing-2) 0;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--tripresale-accent);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--tripresale-accent);
  cursor: pointer;
  border: none;
  box-shadow: var(--shadow-sm);
}

.slider-value {
  text-align: center;
  font-weight: 600;
  color: var(--tripresale-accent);
  margin-top: var(--spacing-2);
  font-size: var(--font-size-sm);
}

/* Results Styles */
.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-3) 0;
  border-bottom: 1px solid var(--tripresale-gray-medium);
}

.result-item:last-child {
  border-bottom: none;
}

.result-label {
  font-weight: 500;
  color: var(--tripresale-gray-dark);
  flex: 1;
  font-size: var(--font-size-sm);
}

.result-value {
  font-weight: 700;
  font-size: var(--font-size-lg);
  color: var(--tripresale-primary);
  text-align: right;
}

/* Annual Benefit Section */
.annual-benefit-section {
  margin: var(--spacing-6) 0;
  padding: var(--spacing-4);
  background: var(--tripresale-gray-light);
  border-radius: var(--radius-md);
  text-align: center;
}

.benefit-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-4);
}

.benefit-display.showing-result {
  background: var(--tripresale-success);
  color: var(--tripresale-white);
  padding: var(--spacing-6);
  border-radius: var(--radius-lg);
  margin: var(--spacing-4) 0;
  animation: slideIn 0.5s ease, pulse 2s infinite;
}

.annual-benefit-value {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  color: var(--tripresale-white);
  margin: var(--spacing-2) 0;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.annual-benefit-label {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--tripresale-white);
}

.btn-gains {
  background: var(--tripresale-success);
  color: var(--tripresale-white);
  border: none;
  padding: var(--spacing-4) var(--spacing-8);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
  width: 100%;
}

.btn-gains:hover {
  background: #38a169;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-gains:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Button Styles */
.btn-primary {
  background: var(--tripresale-accent);
  color: var(--tripresale-white);
  border: none;
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: #3182ce;
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background: var(--tripresale-gray-medium);
  color: var(--tripresale-gray-dark);
  border: none;
  padding: var(--spacing-3) var(--spacing-6);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: #a0aec0;
}

/* Modal Styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  animation: fadeIn 0.3s ease;
}

.modal.show {
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--tripresale-white);
  padding: var(--spacing-8);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  animation: slideIn 0.3s ease;
  text-align: center;
}

.modal-header h3 {
  color: var(--tripresale-primary);
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-6);
}

.modal-body {
  margin-bottom: var(--spacing-6);
  text-align: left;
}

.modal-actions {
  display: flex;
  gap: var(--spacing-4);
  justify-content: center;
}

/* Success Modal */
.success-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--tripresale-success);
  color: var(--tripresale-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-3xl);
  font-weight: bold;
  margin: 0 auto var(--spacing-6) auto;
  animation: bounceIn 0.5s ease;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  color: var(--tripresale-white);
}

.loading-overlay p {
  margin-top: var(--spacing-4);
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 5px solid rgba(255, 255, 255, 0.3);
  border-top: 5px solid var(--tripresale-white);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.loading {
  opacity: 0.6;
  pointer-events: none;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideIn {
  from {
    transform: translateY(-50px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes bounceIn {
  0% {
    transform: scale(0.3);
    opacity: 0;
  }
  50% {
    transform: scale(1.05);
  }
  70% {
    transform: scale(0.9);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(72, 187, 120, 0.7);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(72, 187, 120, 0);
  }
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-6);
  }

  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .logo {
    justify-content: center;
  }

  .modal-content {
    margin: var(--spacing-4);
    width: calc(100% - 2rem);
  }

  .modal-actions {
    flex-direction: column;
  }

  .result-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-2);
  }

  .result-value {
    text-align: left;
  }

  .logo-img {
    width: 50px;
  }

  .annual-benefit-value {
    font-size: var(--font-size-3xl);
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-3);
  }

  .card-body {
    padding: var(--spacing-4);
  }

  .calculator-main {
    padding: var(--spacing-6) 0;
  }

  .annual-benefit-value {
    font-size: var(--font-size-2xl);
  }

  .logo-img {
    width: 45px;
  }
}