/* ===============================================
   RESET & VARIABLES
   =============================================== */

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

:root {
  --primary: #2563eb;
  --danger: #dc2626;
  --success: #16a34a;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-700: #374151;
  --gray-900: #111827;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  color: var(--gray-900);
}

/* ===============================================
   CONTAINER
   =============================================== */

.container {
  background: white;
  max-width: 800px;
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  padding: 40px;
}

/* ===============================================
   HEADER
   =============================================== */

header {
  text-align: center;
  margin-bottom: 40px;
}

h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.subtitle {
  color: var(--gray-700);
  font-size: 14px;
}

/* ===============================================
   LOGIN CARD
   =============================================== */

.login-card {
  text-align: center;
  padding: 32px;
  background: var(--gray-50);
  border-radius: 12px;
  border: 2px solid var(--gray-200);
}

.login-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gray-900);
}

.login-subtitle {
  font-size: 14px;
  color: var(--gray-700);
  margin-bottom: 24px;
}

.login-message {
  margin-top: 16px;
  padding: 12px 16px;
  background: #f0fdf4;
  color: var(--success);
  border-radius: 8px;
  border-left: 4px solid var(--success);
  font-weight: 500;
}

/* ===============================================
   FOOTER USER
   =============================================== */

.footer-user {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 12px;
  color: var(--gray-700);
  margin-bottom: 4px;
}

.footer-settings-btn {
  background: none;
  border: none;
  font-size: 14px;
  color: var(--gray-700);
  cursor: pointer;
  padding: 2px;
  line-height: 1;
  transition: color 0.2s;
}

.footer-settings-btn:hover {
  color: var(--gray-900);
}

/* ===============================================
   SEARCH BOX
   =============================================== */

.search-box {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.search-box input {
  flex: 1;
  padding: 14px 20px;
  font-size: 16px;
  border: 2px solid var(--gray-200);
  border-radius: 8px;
  transition: all 0.2s;
}

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

.search-box button {
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.search-box button:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.search-box button:active {
  transform: translateY(0);
}

.search-box button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* ===============================================
   LOADING STATE
   =============================================== */

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 24px;
  background: var(--gray-50);
  border-radius: 8px;
  margin-bottom: 24px;
}

.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ===============================================
   ERROR STATE
   =============================================== */

.error {
  padding: 16px 20px;
  background: #fee2e2;
  color: var(--danger);
  border-radius: 8px;
  border-left: 4px solid var(--danger);
  margin-bottom: 24px;
}

/* ===============================================
   RESULTS
   =============================================== */

.results {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.result-card {
  padding: 24px;
  border-radius: 8px;
  border: 2px solid var(--gray-200);
  transition: all 0.2s;
}

.result-card:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

.result-card.has-unpaid {
  border-color: #fecaca;
  background: #fef2f2;
}

.result-card.no-unpaid {
  border-color: #bbf7d0;
  background: #f0fdf4;
}

.result-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.status-icon {
  font-size: 24px;
}

.client-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--gray-900);
  flex: 1;
}

.result-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.detail-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.detail-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--gray-700);
  letter-spacing: 0.5px;
}

.detail-value {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-900);
}

.detail-value.amount {
  font-size: 20px;
  color: var(--danger);
}

.result-warning {
  margin-top: 16px;
  padding: 12px;
  background: white;
  border-radius: 6px;
  color: var(--gray-700);
}

.warning-icon {
  color: var(--danger);
  font-weight: 600;
}

.result-ok {
  margin-top: 16px;
  padding: 12px;
  background: white;
  border-radius: 6px;
}

.ok-icon {
  color: var(--success);
  font-weight: 600;
}

.no-results {
  text-align: center;
  padding: 48px 24px;
  color: var(--gray-700);
}

/* ===============================================
   FOOTER
   =============================================== */

footer {
  text-align: center;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}

footer p {
  font-size: 12px;
  color: var(--gray-700);
}

/* ===============================================
   UTILITY CLASSES
   =============================================== */

.hidden {
  display: none !important;
}

/* ===============================================
   RESPONSIVE
   =============================================== */

@media (max-width: 640px) {
  .container {
    padding: 24px;
  }

  h1 {
    font-size: 24px;
  }

  .search-box {
    flex-direction: column;
  }

  .search-box button {
    width: 100%;
  }

  .result-details {
    grid-template-columns: 1fr;
  }

  .login-card {
    padding: 20px;
  }

}