/* ===================================
   Avacus Gas Sponsor - Main Styles
   =================================== */

:root {
  --primary-color: #2563eb;
  --primary-hover: #1e40af;
  --secondary-color: #64748b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --info-color: #3b82f6;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-sidebar: #1e293b;
  
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;
  
  --border-color: #e2e8f0;
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  --sidebar-width: 240px;
  --header-height: 64px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  line-height: 1.6;
}

/* ===================================
   Header
   =================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  padding: 0 24px;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  padding: 8px;
  color: var(--text-primary);
}

.header-logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 8px;
}

.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 16px;
}

.notification-btn,
.account-btn {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  padding: 8px;
  color: var(--text-secondary);
  position: relative;
}

.language-toggle {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-primary);
  transition: all 0.2s;
}

.language-toggle:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--primary-color);
}

.notification-btn:hover,
.account-btn:hover {
  color: var(--text-primary);
}

.notification-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background-color: var(--danger-color);
  border-radius: 50%;
}

/* ===================================
   Sidebar
   =================================== */

.sidebar {
  position: fixed;
  top: var(--header-height);
  left: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  padding: 24px 0;
  overflow-y: auto;
  z-index: 90;
  transition: transform 0.3s ease;
}

.nav-menu {
  list-style: none;
}

.nav-item {
  margin-bottom: 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 24px;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: all 0.2s;
  font-size: 15px;
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-inverse);
}

.nav-link.active {
  background-color: rgba(37, 99, 235, 0.2);
  color: var(--text-inverse);
  border-right: 3px solid var(--primary-color);
}

.nav-link .icon {
  font-size: 20px;
  width: 24px;
  text-align: center;
}

/* ===================================
   Main Content
   =================================== */

.main-content {
  margin-left: var(--sidebar-width);
  margin-top: var(--header-height);
  padding: 32px;
  min-height: calc(100vh - var(--header-height));
}

.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ===================================
   Cards
   =================================== */

.card {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 24px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.card-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-body {
  color: var(--text-secondary);
}

.card-footer {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 12px;
}

/* ===================================
   Stats Cards
   =================================== */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.stat-card {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.stat-change {
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 4px;
}

.stat-change.positive {
  color: var(--success-color);
}

.stat-change.negative {
  color: var(--danger-color);
}

/* ===================================
   Buttons
   =================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--border-radius);
  border: none;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

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

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

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

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

.btn-danger {
  background-color: var(--danger-color);
  color: var(--text-inverse);
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover {
  background-color: var(--bg-tertiary);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

/* ===================================
   Progress Bar
   =================================== */

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  margin: 12px 0;
}

.progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  transition: width 0.3s ease;
}

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

.progress-fill.warning {
  background-color: var(--warning-color);
}

.progress-fill.danger {
  background-color: var(--danger-color);
}

/* ===================================
   Alerts
   =================================== */

.alert {
  padding: 16px;
  border-radius: var(--border-radius);
  margin-bottom: 16px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.alert-warning {
  background-color: #fef3c7;
  color: #92400e;
  border-left: 4px solid var(--warning-color);
}

.alert-info {
  background-color: #dbeafe;
  color: #1e40af;
  border-left: 4px solid var(--info-color);
}

.alert-success {
  background-color: #d1fae5;
  color: #065f46;
  border-left: 4px solid var(--success-color);
}

.alert-danger {
  background-color: #fee2e2;
  color: #991b1b;
  border-left: 4px solid var(--danger-color);
}

/* ===================================
   Table
   =================================== */

.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background-color: var(--bg-tertiary);
}

th {
  padding: 12px 16px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}

td {
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border-color);
}

tr:hover {
  background-color: var(--bg-secondary);
}

/* ===================================
   Forms
   =================================== */

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

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-label.required::after {
  content: ' *';
  color: var(--danger-color);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  transition: border-color 0.2s;
}

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

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-hint {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 4px;
}

/* ===================================
   Badge
   =================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  border-radius: 12px;
}

.badge-success {
  background-color: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background-color: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background-color: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background-color: #dbeafe;
  color: #1e40af;
}

.badge-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* ===================================
   Loading
   =================================== */

.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
    padding: 16px;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .card {
    padding: 16px;
  }
  
  .page-title {
    font-size: 24px;
  }
}

/* ===================================
   Overlay (for mobile sidebar)
   =================================== */

.overlay {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 85;
}

.overlay.show {
  display: block;
}