/* Reset y variables CSS */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --success-color: #10b981;
  --error-color: #ef4444;
  --background-color: #f8fafc;
  --card-background: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --border-color: #e2e8f0;
  --border-radius: 12px;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 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);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 500px;
  margin: 0 auto;
  background: var(--card-background);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: white;
  padding: 30px 25px;
  text-align: center;
}

header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 8px;
}

header p {
  opacity: 0.9;
  font-size: 0.95rem;
  font-weight: 300;
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 25px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.875rem;
  background-color: #fef7cd;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #f59e0b;
  animation: pulse 2s infinite;
}

.status-indicator.connected {
  background-color: #dcfce7;
}

.status-indicator.connected .status-dot {
  background-color: var(--success-color);
  animation: none;
}

.status-indicator.error {
  background-color: #fee2e2;
}

.status-indicator.error .status-dot {
  background-color: var(--error-color);
  animation: none;
}

@keyframes pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.expense-form {
  padding: 30px 25px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
  font-size: 0.875rem;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: 8px;
  font-size: 16px; /* Prevent zoom on iOS */
  font-family: inherit;
  background-color: white;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input[type='number'] {
  text-align: right;
}

.submit-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

.submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.submit-btn:active {
  transform: translateY(0);
}

.submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-loading {
  display: none;
}

.submit-btn.loading .btn-text {
  display: none;
}

.submit-btn.loading .btn-loading {
  display: inline;
}

.success-message,
.error-message {
  display: none;
  padding: 15px 25px;
  font-weight: 500;
  text-align: center;
}

.success-message {
  background-color: #dcfce7;
  color: #166534;
  border-top: 1px solid #bbf7d0;
}

.error-message {
  background-color: #fee2e2;
  color: #991b1b;
  border-top: 1px solid #fecaca;
}

.success-message.show,
.error-message.show {
  display: block;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Optimizaciones para iPhone */
@media (max-width: 480px) {
  body {
    padding: 10px;
  }

  .container {
    border-radius: 0;
    box-shadow: none;
    min-height: calc(100vh - 20px);
  }

  header {
    padding: 25px 20px;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .expense-form {
    padding: 25px 20px;
  }

  .form-group {
    margin-bottom: 18px;
  }

  .form-group input,
  .form-group select {
    padding: 14px 16px;
    font-size: 16px; /* Importante para evitar zoom en iOS */
  }

  .submit-btn {
    padding: 16px;
    font-size: 1.1rem;
  }
}

/* Mejoras para Safari iOS */
@supports (-webkit-touch-callout: none) {
  .form-group input[type='date'] {
    -webkit-appearance: none;
    appearance: none;
  }
}

/* Accesibilidad y estados activos */
@media (hover: none) and (pointer: coarse) {
  .submit-btn:hover {
    transform: none;
  }

  .submit-btn:active {
    transform: scale(0.98);
  }
}