:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --text-color: #1f2937;
  --bg-color: #f3f4f6;
  --white: #ffffff;
  --error: #dc2626;
  --error-bg: #fee2e2;
  --success: #059669;
  --success-bg: #d1fae5;
  --border-color: #d1d5db;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.6;
  background-color: var(--bg-color);
  color: var(--text-color);
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background-color: var(--white);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

.logo:hover {
  color: var(--primary-hover);
}

nav {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.2s;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.nav-link:hover {
  background-color: var(--bg-color);
  color: var(--primary-color);
}

main {
  flex: 1;
  padding: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.dashboard-container {
  background-color: var(--white);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  overflow: hidden;
  margin-top: 2rem;
}

.dashboard-header {
  padding: 2rem;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--white);
}

.dashboard-header h2 {
  margin-bottom: 1.5rem;
  color: var(--text-color);
  font-size: 1.8rem;
}

.tabs {
  display: flex;
  gap: 1rem;
  border-bottom: 1px solid var(--border-color);
  overflow-x: auto;
  padding-bottom: 1px;
  background-color: var(--white);
  padding: 0 1rem;
}

.tab-button {
  padding: 1rem 1.5rem;
  background: none;
  border: none;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-color);
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
  white-space: nowrap;
  position: relative;
}

.tab-button:hover {
  color: var(--primary-color);
}

.tab-button.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--primary-color);
}

.tab-content {
  display: none;
  padding: 2rem;
  animation: fadeIn 0.3s ease-in-out;
}

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

.tab-content.active {
  display: block;
}

.welcome-card {
  background-color: var(--bg-color);
  padding: 2rem;
  border-radius: 0.8rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

.welcome-card h3 {
  color: var(--text-color);
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.user-info {
  display: grid;
  gap: 1rem;
}

.user-info p {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem;
  background-color: var(--white);
  border-radius: 0.5rem;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.info-form, .payment-container {
  max-width: 600px;
  margin: 0 auto;
  background-color: var(--white);
  padding: 2rem;
  border-radius: 0.8rem;
  box-shadow: var(--shadow);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.logs-container {
  margin-top: 1rem;
  background-color: var(--white);
  border-radius: 0.8rem;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.log-entry {
  display: flex;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s;
}

.log-entry:hover {
  background-color: var(--bg-color);
}

.log-entry:last-child {
  border-bottom: none;
}

.security-forms {
  display: grid;
  gap: 2rem;
  max-width: 800px;
  margin: 0 auto;
}

.security-form {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 0.8rem;
  box-shadow: var(--shadow);
}

.security-form h3 {
  margin-bottom: 1.5rem;
  color: var(--text-color);
  font-size: 1.3rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-color);
}

input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: 0.5rem;
  font-size: 1rem;
  transition: all 0.2s;
  background-color: var(--white);
}

input:hover {
  border-color: var(--primary-color);
}

input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
  font-size: 1rem;
}

.button:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.button.primary {
  background-color: var(--primary-color);
  color: var(--white);
}

.button.primary:hover:not(:disabled) {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.button.secondary {
  background-color: var(--white);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
}

.button.secondary:hover:not(:disabled) {
  background-color: var(--bg-color);
  transform: translateY(-1px);
}

.error {
  color: var(--error);
  background-color: var(--error-bg);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.success {
  color: var(--success);
  background-color: var(--success-bg);
  padding: 1rem;
  border-radius: 0.5rem;
  margin-bottom: 1rem;
  font-weight: 500;
}

.saved-cards {
  margin-bottom: 2rem;
}

.card-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  background-color: var(--white);
  border-radius: 0.8rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.card-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.payment-form {
  background-color: var(--white);
  padding: 2rem;
  border-radius: 0.8rem;
  box-shadow: var(--shadow);
  margin-bottom: 2rem;
}

.payment-history {
  margin-top: 2rem;
}

.payment-list {
  margin-top: 1rem;
  background-color: var(--white);
  border-radius: 0.8rem;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.payment-history-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1.5rem;
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s;
}

.payment-history-item:hover {
  background-color: var(--bg-color);
}

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

.verify-container {
  max-width: 500px;
  margin: 2rem auto;
  padding: 2rem;
  background-color: var(--white);
  border-radius: 1rem;
  box-shadow: var(--shadow);
  text-align: center;
}

.verify-state {
  padding: 2rem;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 4px solid var(--border-color);
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  margin: 0 auto 1rem;
  animation: spin 1s linear infinite;
}

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

.success-icon, .error-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.success-icon {
  color: var(--success);
}

.error-icon {
  color: var(--error);
}

.verify-state h2 {
  margin-bottom: 1rem;
  font-size: 1.5rem;
}

.verify-state p {
  margin-bottom: 1.5rem;
  color: #6b7280;
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .security-forms {
    gap: 1.5rem;
  }

  .payment-history-item {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}