:root {
  --primary: #667eea;
  --primary-dark: #5a67d8;
  --success: #48bb78;
  --success-dark: #38a169;
  --warning: #ed8936;
  --warning-dark: #dd6b20;
  --danger: #f56565;
  --danger-dark: #e53e3e;
  --gray-50: #f7fafc;
  --gray-100: #edf2f7;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e0;
  --gray-400: #a0aec0;
  --gray-500: #718096;
  --gray-600: #4a5568;
  --gray-700: #2d3748;
  --gray-800: #1a202c;
  --gray-900: #171923;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, var(--gray-100) 0%, var(--gray-200) 100%);
  min-height: 100vh;
  color: var(--gray-800);
  line-height: 1.6;
}

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

.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  margin: 0 -1rem;
  padding: 0 1rem;
  box-shadow: var(--shadow-lg);
  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: 1rem 0;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
}

.nav {
  display: flex;
  gap: 0.5rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.15);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.nav-link:hover {
  background: rgba(255, 255, 255, 0.25);
}

.main {
  padding: 2rem 0;
}

.add-section {
  margin-bottom: 2rem;
}

.add-form {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.add-form h2 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
  color: var(--gray-700);
}

.input-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.input-group input {
  flex: 1;
  min-width: 200px;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.2s, background 0.2s;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn:active {
  transform: translateY(0);
}

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

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

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

.btn-success:hover {
  background: var(--success-dark);
}

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

.btn-warning:hover {
  background: var(--warning-dark);
}

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

.btn-danger:hover {
  background: var(--danger-dark);
}

.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}

.btn-secondary:hover {
  background: var(--gray-300);
}

.preview-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  margin-top: 1rem;
  overflow: hidden;
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.preview-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 2rem;
  color: var(--gray-500);
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.preview-content {
  padding: 1.5rem;
}

.preview-image-container {
  margin: -1.5rem -1.5rem 1rem;
  max-height: 300px;
  overflow: hidden;
  background: var(--gray-100);
}

.preview-image {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

.preview-image[src=""] {
  display: none;
}

.preview-image[src=""]+.preview-info {
  margin-top: 0;
}

.preview-site {
  font-size: 0.85rem;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.preview-title {
  font-size: 1.25rem;
  color: var(--gray-800);
  margin: 0.5rem 0;
  line-height: 1.4;
}

.preview-description {
  color: var(--gray-600);
  margin-bottom: 0.75rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.preview-url {
  font-size: 0.85rem;
  color: var(--primary);
  word-break: break-all;
}

.preview-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--gray-200);
}

.entries-section h2 {
  margin-bottom: 1rem;
  font-size: 1.25rem;
  color: var(--gray-700);
}

.entries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.entry-card {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

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

.entry-image {
  width: 100%;
  height: 160px;
  object-fit: cover;
  background: var(--gray-100);
}

.entry-image.no-image {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  font-size: 3rem;
}

.entry-content {
  padding: 1rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.entry-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-bottom: 0.5rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.entry-description {
  font-size: 0.9rem;
  color: var(--gray-600);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.entry-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--gray-500);
}

.entry-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}

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

.loading-placeholder {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 3rem;
  color: var(--gray-500);
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem;
  color: var(--gray-500);
}

.empty-state-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: white;
  border-radius: var(--radius);
  padding: 2rem;
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-xl);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 32px;
  height: 32px;
  background: var(--gray-100);
  border: none;
  border-radius: 50%;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-600);
  transition: background 0.2s;
}

.modal-close:hover {
  background: var(--gray-200);
}

.modal-content h2 {
  margin-bottom: 1.5rem;
  color: var(--gray-800);
}

.error-message {
  color: var(--danger);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.admin-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.admin-entries {
  border-top: 1px solid var(--gray-200);
  padding-top: 1rem;
  margin-top: 1rem;
}

.admin-entry {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.admin-entry-title {
  font-size: 0.9rem;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-right: 1rem;
}

.admin-entry-delete {
  padding: 0.25rem 0.75rem;
  font-size: 0.8rem;
}

.bookmarklet-section {
  background: white;
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin: 2rem 0;
  text-align: center;
}

.bookmarklet-section h3 {
  margin-bottom: 0.5rem;
  color: var(--gray-700);
}

.bookmarklet-section p {
  color: var(--gray-600);
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.bookmarklet-link {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  box-shadow: var(--shadow);
  cursor: grab;
}

.bookmarklet-hint {
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 1rem;
}

.footer {
  text-align: center;
  padding: 2rem 0;
  color: var(--gray-500);
  font-size: 0.9rem;
}

.footer a {
  color: var(--primary);
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--gray-800);
  color: white;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  z-index: 2000;
  max-width: 90%;
  text-align: center;
}

.toast.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  background: var(--success);
}

.toast.error {
  background: var(--danger);
}

@media (max-width: 600px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .input-group {
    flex-direction: column;
  }

  .input-group input {
    width: 100%;
  }

  .preview-actions {
    flex-direction: column;
  }

  .entries-grid {
    grid-template-columns: 1fr;
  }

  .admin-entry {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .admin-entry-title {
    margin-right: 0;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --gray-50: #1a202c;
    --gray-100: #2d3748;
    --gray-200: #4a5568;
    --gray-300: #718096;
    --gray-400: #a0aec0;
    --gray-500: #cbd5e0;
    --gray-600: #e2e8f0;
    --gray-700: #edf2f7;
    --gray-800: #f7fafc;
    --gray-900: #ffffff;
  }

  body {
    background: linear-gradient(135deg, #1a202c 0%, #2d3748 100%);
    color: var(--gray-800);
  }

  .add-form,
  .entry-card,
  .preview-card,
  .modal-content,
  .bookmarklet-section {
    background: var(--gray-50);
  }

  .input-group input {
    background: var(--gray-100);
    color: var(--gray-800);
    border-color: var(--gray-200);
  }

  .preview-image-container,
  .entry-image {
    background: var(--gray-100);
  }
}

@media (display-mode: standalone) {
  .header {
    padding-top: env(safe-area-inset-top);
  }

  .footer {
    padding-bottom: env(safe-area-inset-bottom);
  }
}