/* CSS Variables for theming */
:root {
  /* Light mode */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-light: #dbeafe;
  --success: #10b981;
  --danger: #ef4444;
  --shadow: rgba(15, 23, 42, 0.08);
  --shadow-hover: rgba(15, 23, 42, 0.15);
}

[data-theme="dark"] {
  /* Dark mode */
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: #334155;
  --accent: #60a5fa;
  --accent-hover: #3b82f6;
  --accent-light: #1e3a5f;
  --success: #34d399;
  --danger: #f87171;
  --shadow: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 0;
  z-index: 100;
  box-shadow: 0 2px 8px var(--shadow);
}

.header-content {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.header-actions .btn-primary {
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.header-actions .btn-primary:hover {
  box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
}

.btn {
  padding: 0.625rem 1rem;
  border: none;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.btn-icon {
  padding: 0.625rem;
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 2px solid var(--border);
}

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

/* Search and Controls */
.controls {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.search-container {
  flex: 1;
  min-width: 200px;
}

.search-input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: border-color 0.2s ease;
}

.search-input:focus {
  outline: none;
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.filter-buttons {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Info Bar */
.info-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
  gap: 1rem;
  flex-wrap: wrap;
}

.last-updated {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.sort-controls {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  position: relative;
}

.help-icon {
  border: 2px solid var(--accent);
  background: var(--bg-secondary);
  color: var(--accent);
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease;
}

.help-icon:hover,
.help-icon:focus {
  outline: none;
  transform: translateY(-1px);
  background: var(--accent-light);
}

.help-popover {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 8px 20px var(--shadow);
  font-size: 0.85rem;
  color: var(--text-secondary);
  width: 240px;
  display: none;
  z-index: 5;
}

.help-popover ul {
  padding-left: 1.1rem;
  margin-top: 0.35rem;
  display: grid;
  gap: 0.35rem;
}

.help-popover[data-visible="true"] {
  display: block;
}

.sort-controls label {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.sort-select {
  padding: 0.5rem;
  border: 2px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
}

.sort-select:focus {
  outline: none;
  border-color: var(--accent);
}

/* Bonus Cards */
.bonus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  padding: 2rem 0;
}

.bonus-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.bonus-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px var(--shadow-hover);
  border-color: var(--accent);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 1rem;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}

.favorite-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0;
  transition: transform 0.2s ease;
  color: var(--text-muted);
}

.favorite-btn:hover {
  transform: scale(1.2);
}

.favorite-btn.active {
  color: #fbbf24;
}

.bonus-title {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.bonus-code {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-light);
  color: var(--accent);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  font-size: 0.875rem;
  font-weight: 600;
  font-family: 'Courier New', monospace;
}

.copy-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  color: var(--accent);
  padding: 0;
  transition: transform 0.2s ease;
}

.copy-btn:hover {
  transform: scale(1.2);
}

.verified-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.card-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
}

.bonus-meta {
  margin-top: 1rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  display: grid;
  gap: 0.75rem;
}

.bonus-meta .meta-items {
  display: grid;
  gap: 0.5rem;
}

.meta-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.meta-item span:first-child {
  font-weight: 600;
  color: var(--text-primary);
}

.meta-edit-btn {
  align-self: start;
  border: 2px dashed var(--accent);
  background: transparent;
  color: var(--accent);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
}

.meta-edit-btn:hover,
.meta-edit-btn:focus {
  background: var(--accent-light);
  outline: none;
}

.meta-form {
  display: none;
  gap: 0.75rem;
}

.meta-form[data-visible="true"] {
  display: grid;
}

.meta-form label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  display: grid;
  gap: 0.25rem;
}

.meta-form input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.meta-form-actions {
  display: flex;
  gap: 0.5rem;
}

.meta-save-btn,
.meta-cancel-btn {
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  border: none;
  font-size: 0.8rem;
  cursor: pointer;
}

.meta-save-btn {
  background: var(--accent);
  color: white;
}

.meta-cancel-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-secondary);
}

.meta-cancel-btn:hover {
  color: var(--text-primary);
}

.meta-empty {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.visit-btn {
  flex: 1;
  padding: 0.875rem 1.5rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  text-align: center;
  display: block;
}

.visit-btn:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-hover);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
}

.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}

/* Footer */
.footer {
  margin-top: 4rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 1rem 1.5rem;
  border-radius: 8px;
  box-shadow: 0 8px 24px var(--shadow-hover);
  border: 1px solid var(--border);
  z-index: 1000;
  animation: slideIn 0.3s ease;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal[data-open="true"] {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
}

.modal-content {
  position: relative;
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 2rem;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 24px 48px rgba(15, 23, 42, 0.35);
  z-index: 1;
  display: grid;
  gap: 1rem;
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.modal-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.modal-form {
  display: grid;
  gap: 1rem;
}

.form-row {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.form-group {
  display: grid;
  gap: 0.4rem;
}

.form-group label {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.form-group input {
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.submit-btn {
  justify-content: center;
}

.modal-success {
  font-size: 0.9rem;
  color: var(--success);
  min-height: 1.2rem;
}

@keyframes slideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-top {
    flex-wrap: wrap;
  }
  
  .controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .search-container {
    width: 100%;
  }
  
  .bonus-grid {
    grid-template-columns: 1fr;
  }
  
  .info-bar {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .btn {
    font-size: 1rem;
    padding: 0.75rem 1.25rem;
  }
  
  .toast {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
  }
}

@media (max-width: 600px) {
  .modal-content {
    margin: 1rem;
    padding: 1.5rem;
  }

  .help-popover {
    left: auto;
    right: 0;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.25rem;
  }
  
  .header-actions {
    gap: 0.25rem;
  }
  
  .btn-icon {
    width: 38px;
    height: 38px;
  }
}

/* Accessibility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus styles for accessibility */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}