/* ==================== VARIABLES ==================== */
:root {
  --primary-color: #1e3a5f;
  --primary-light: #2c5282;
  --primary-dark: #1a2f4a;
  --accent-color: #c9a227;
  --accent-light: #d4b545;
  --success-color: #38a169;
  --warning-color: #d69e2e;
  --error-color: #e53e3e;
  --air-color: #3182ce;
  --sea-color: #2b6cb0;
  
  --bg-color: #f7fafc;
  --card-bg: #ffffff;
  --text-primary: #2d3748;
  --text-secondary: #718096;
  --border-color: #e2e8f0;
  
  --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);
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ==================== RESET & BASE ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

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

/* ==================== HEADER ==================== */
.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 15px;
}

.header-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.admin-link {
  color: var(--accent-light);
  text-decoration: none;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--accent-light);
  border-radius: var(--radius-md);
  transition: all 0.2s;
  white-space: nowrap;
}

.admin-link:hover {
  background: var(--accent-light);
  color: var(--primary-dark);
}

.admin-link:first-child {
  background: rgba(201, 162, 39, 0.15);
}

.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: white;
  padding: 30px 0;
  margin-bottom: 30px;
}

.header .logo {
  display: flex;
  align-items: center;
  gap: 15px;
}

.header .logo i {
  font-size: 2.5rem;
  color: var(--accent-color);
}

.header h1 {
  font-size: 2rem;
  font-weight: 700;
}

.header .subtitle {
  margin-top: 8px;
  opacity: 0.9;
  font-size: 1.1rem;
}

/* ==================== CARDS ==================== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 25px;
  margin-bottom: 25px;
}

.card h2 {
  color: var(--primary-color);
  font-size: 1.3rem;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding-bottom: 15px;
  border-bottom: 2px solid var(--border-color);
}

.card h2 i {
  color: var(--accent-color);
}

/* ==================== FORMS ==================== */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-bottom: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.form-group input,
.form-group select {
  padding: 12px 15px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(44, 82, 130, 0.1);
}

.form-group .hint {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 5px;
}

/* ==================== BUTTONS ==================== */
.btn-primary {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-light) 100%);
  color: var(--primary-dark);
  border: none;
  padding: 15px 30px;
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
  width: 100%;
  justify-content: center;
}

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

.btn-secondary {
  background: var(--card-bg);
  color: var(--primary-color);
  border: 2px solid var(--primary-color);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.btn-secondary:hover {
  background: var(--primary-color);
  color: white;
}

.btn-link {
  background: none;
  border: none;
  color: var(--primary-light);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 5px;
}

.btn-link:hover {
  text-decoration: underline;
}

/* ==================== SUMMARY BOX ==================== */
.summary-box {
  background: linear-gradient(135deg, #edf2f7 0%, #e2e8f0 100%);
  border-radius: var(--radius-md);
  padding: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  margin-bottom: 20px;
}

.summary-item {
  display: flex;
  flex-direction: column;
}

.summary-item .label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.summary-item .value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

/* ==================== TABLES ==================== */
.table-responsive {
  overflow-x: auto;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.results-table th {
  background: var(--primary-color);
  color: white;
  padding: 12px 15px;
  text-align: left;
  font-weight: 600;
  white-space: nowrap;
}

.results-table td {
  padding: 12px 15px;
  border-bottom: 1px solid var(--border-color);
}

.results-table tbody tr:hover {
  background: #f7fafc;
}

.results-table tbody tr.best-option {
  background: linear-gradient(135deg, #c6f6d5 0%, #9ae6b4 100%);
}

.results-table tbody tr.best-option td {
  font-weight: 600;
}

.results-table .total-cell {
  font-weight: 700;
  color: var(--primary-color);
  font-size: 1.1rem;
}

.results-table .per-bottle {
  color: var(--success-color);
  font-weight: 600;
}

/* ==================== RECOMMENDATION CARD ==================== */
.recommendation-card {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: white;
}

.recommendation-card h2 {
  color: white;
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

.recommendation-card h2 i {
  color: var(--accent-color);
}

.recommendation-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
}

.recommendation-item {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 20px;
}

.recommendation-item h3 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  opacity: 0.8;
  margin-bottom: 10px;
}

.recommendation-item .value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-color);
}

.recommendation-item .details {
  font-size: 0.9rem;
  margin-top: 8px;
  opacity: 0.9;
}

.recommendation-summary {
  margin-top: 20px;
  padding: 15px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent-color);
}

/* ==================== CHART ==================== */
.chart-container {
  position: relative;
  height: 400px;
  width: 100%;
}

/* ==================== EXPORT SECTION ==================== */
.export-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 15px;
}

/* ==================== HISTORY ==================== */
.history-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px;
  background: #f7fafc;
  border-radius: var(--radius-md);
  border-left: 4px solid var(--primary-color);
}

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

.history-item .date {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.history-item .route {
  font-weight: 600;
  color: var(--primary-color);
}

.history-item .cost {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--success-color);
}

.empty-state {
  text-align: center;
  color: var(--text-secondary);
  padding: 30px;
}

/* ==================== LOADING ==================== */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  padding: 40px;
  font-size: 1.2rem;
  color: var(--primary-color);
}

.loading i {
  font-size: 2rem;
  color: var(--accent-color);
}

/* ==================== FOOTER ==================== */
.footer {
  background: var(--primary-dark);
  color: white;
  padding: 20px 0;
  margin-top: 40px;
  text-align: center;
}

.footer .rates-info {
  margin-top: 10px;
  font-size: 0.9rem;
  opacity: 0.8;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
}

.footer .btn-link {
  color: var(--accent-color);
}

/* ==================== UTILITIES ==================== */
.hidden {
  display: none !important;
}

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

.text-warning {
  color: var(--warning-color);
}

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

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
}

.badge-air {
  background: rgba(49, 130, 206, 0.1);
  color: var(--air-color);
}

.badge-sea {
  background: rgba(43, 108, 176, 0.1);
  color: var(--sea-color);
}

.badge-best {
  background: var(--success-color);
  color: white;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .header h1 {
    font-size: 1.5rem;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .summary-box {
    flex-direction: column;
    gap: 15px;
  }
  
  .export-buttons {
    flex-direction: column;
  }
  
  .export-buttons button {
    width: 100%;
  }
  
  .recommendation-content {
    grid-template-columns: 1fr;
  }
  
  .results-table {
    font-size: 0.85rem;
  }
  
  .results-table th,
  .results-table td {
    padding: 8px 10px;
  }
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.card {
  animation: fadeIn 0.3s ease-out;
}

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

.loading i {
  animation: pulse 1s ease-in-out infinite;
}

/* ==================== ADMIN STYLES ==================== */

.admin-header {
  background: linear-gradient(135deg, #2d3748 0%, #1a202c 100%);
}

.admin-header .back-link {
  color: var(--accent-light);
  text-decoration: none;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  margin-top: 10px;
}

.admin-header .back-link:hover {
  color: #fff;
}

.admin-main {
  padding-top: 30px;
  padding-bottom: 50px;
}

/* Upload Area */
.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  text-align: center;
  transition: all 0.3s ease;
  background: #f8fafc;
}

.upload-area:hover {
  border-color: var(--primary-color);
  background: #edf2f7;
}

.upload-area input[type="file"] {
  display: none;
}

.upload-label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  color: var(--text-secondary);
}

.upload-label i {
  font-size: 3rem;
  color: var(--primary-color);
}

.upload-label span {
  font-size: 1.1rem;
  font-weight: 500;
}

.upload-label small {
  color: var(--text-secondary);
}

/* Upload Status */
.upload-status {
  margin-top: 20px;
}

.upload-errors {
  background: #fff5f5;
  border: 1px solid #feb2b2;
  border-radius: var(--radius-md);
  padding: 15px;
  margin-bottom: 15px;
}

.upload-errors h4 {
  color: var(--error-color);
  margin-bottom: 10px;
}

.upload-errors ul {
  margin-left: 20px;
  color: #c53030;
}

.upload-warnings {
  background: #fffbeb;
  border: 1px solid #fbd38d;
  border-radius: var(--radius-md);
  padding: 15px;
  margin-bottom: 15px;
}

.upload-warnings h4 {
  color: var(--warning-color);
  margin-bottom: 10px;
}

.upload-warnings ul {
  margin-left: 20px;
  color: #b7791f;
}

.upload-success {
  background: #f0fff4;
  border: 1px solid #9ae6b4;
  border-radius: var(--radius-md);
  padding: 15px;
}

.upload-success h4 {
  color: var(--success-color);
  margin-bottom: 10px;
}

.upload-info {
  background: #ebf8ff;
  border: 1px solid #90cdf4;
  border-radius: var(--radius-md);
  padding: 15px;
  color: #2b6cb0;
}

/* Quotations List */
.quotations-actions {
  margin-bottom: 20px;
}

.quotations-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 15px;
}

.quotations-table th,
.quotations-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.quotations-table th {
  background: #f7fafc;
  font-weight: 600;
  color: var(--text-secondary);
}

.quotations-table tr:hover {
  background: #f8fafc;
}

.btn-small {
  padding: 6px 10px;
  font-size: 0.85rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

.btn-danger {
  background: var(--error-color);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s;
}

.btn-danger:hover {
  background: #c53030;
}

.btn-small.btn-danger {
  background: #fed7d7;
  color: var(--error-color);
}

.btn-small.btn-danger:hover {
  background: var(--error-color);
  color: white;
}

.no-data {
  text-align: center;
  color: var(--text-secondary);
  padding: 40px;
  font-style: italic;
}

/* Instructions */
.instructions {
  line-height: 1.8;
}

.instructions h3 {
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.instructions h4 {
  margin-top: 15px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.instructions ol,
.instructions ul {
  margin-left: 25px;
  margin-bottom: 15px;
}

.instructions li {
  margin-bottom: 8px;
}

.instructions strong {
  color: var(--primary-dark);
}

.instructions em {
  color: var(--text-secondary);
}

/* Notification */
.notification {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 15px 25px;
  border-radius: var(--radius-md);
  color: white;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  animation: slideIn 0.3s ease-out;
}

.notification.success {
  background: var(--success-color);
}

.notification.error {
  background: var(--error-color);
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}