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

:root {
  --primary-color: #1f77b4;
  --error-color: #d32f2f;
  --success-color: #388e3c;
  --bg-color: #f5f5f5;
  --card-bg: #ffffff;
  --text-color: #333333;
  --border-color: #dddddd;
}

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

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

header {
  text-align: center;
  margin-bottom: 40px;
  padding: 40px 20px;
  background: linear-gradient(135deg, var(--primary-color), #2196f3);
  color: white;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

header p {
  font-size: 1.1rem;
  opacity: 0.95;
}

.input-section {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 40px;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.input-group label {
  font-weight: 600;
  font-size: 1.1rem;
}

.input-group input[type="url"] {
  padding: 12px 16px;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  transition: border-color 0.3s;
}

.input-group input[type="url"]:focus {
  outline: none;
  border-color: var(--primary-color);
}

.input-group button {
  padding: 12px 24px;
  font-size: 1.1rem;
  font-weight: 600;
  color: white;
  background-color: var(--primary-color);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.1s;
}

.input-group button:hover {
  background-color: #1565c0;
}

.input-group button:active {
  transform: scale(0.98);
}

.input-group button:disabled {
  background-color: #cccccc;
  cursor: not-allowed;
}

.error-message {
  color: var(--error-color);
  padding: 12px;
  border-radius: 6px;
  margin-top: 15px;
  display: none;
  background-color: #ffebee;
  border-left: 4px solid var(--error-color);
}

.error-message.visible {
  display: block;
}

.loading {
  text-align: center;
  padding: 30px;
  margin-top: 20px;
}

.spinner {
  width: 50px;
  height: 50px;
  margin: 0 auto 15px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.results-section {
  margin-top: 40px;
}

.results-section h2 {
  text-align: center;
  font-size: 2rem;
  margin-bottom: 40px;
  color: var(--text-color);
}

.visualization {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 40px;
}

.visualization h3 {
  font-size: 1.5rem;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.visualization .description {
  color: #666;
  margin-bottom: 20px;
  font-style: italic;
}

.svg-container {
  width: 100%;
  overflow-x: auto;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background: white;
  display: flex;
  justify-content: center;
  align-items: center;
}

.svg-container svg {
  display: block;
  max-width: 100%;
  height: auto;
}

.download-btn {
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: white;
  background-color: var(--success-color);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.download-btn:hover {
  background-color: #2e7d32;
}

footer {
  text-align: center;
  margin-top: 60px;
  padding: 20px;
  color: #666;
  font-size: 0.9rem;
}

footer p {
  margin: 8px 0;
}

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

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

.support-link {
  color: #ff6b6b;
  font-weight: 500;
}

.support-link:hover {
  color: #ee5a52;
}

.cors-settings {
  margin-top: 20px;
  padding: 15px;
  background-color: #f9f9f9;
  border: 1px solid var(--border-color);
  border-radius: 6px;
}

.cors-settings summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text-color);
  user-select: none;
  padding: 5px;
}

.cors-settings summary:hover {
  color: var(--primary-color);
}

.cors-content {
  margin-top: 15px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
}

.method-option {
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.method-option:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.method-option h4 {
  margin-bottom: 10px;
  color: var(--primary-color);
  font-size: 1rem;
}

.cors-info {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 15px;
  line-height: 1.5;
}

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

.cors-info a:hover {
  text-decoration: underline;
}

.radio-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.radio-group label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 8px;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.radio-group label:hover {
  background-color: #f0f0f0;
}

.radio-group input[type="radio"] {
  cursor: pointer;
  width: 18px;
  height: 18px;
}

.radio-group span {
  font-size: 1rem;
}

.secondary-btn {
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary-color);
  background-color: white;
  border: 2px solid var(--primary-color);
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s, color 0.3s;
}

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

.primary-btn {
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: white;
  background-color: var(--primary-color);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.primary-btn:hover:not(:disabled) {
  background-color: #1565c0;
}

.primary-btn:disabled {
  background-color: #cccccc;
  cursor: not-allowed;
}

.manual-section {
  background: #fff3cd;
  border: 2px solid #ffc107;
  border-radius: 8px;
  padding: 20px;
  margin-top: 20px;
}

.manual-section h3 {
  margin-bottom: 15px;
  color: #856404;
}

.info-text {
  color: #856404;
  margin-bottom: 15px;
}

.instructions {
  margin: 15px 0 20px 20px;
  color: #856404;
}

.instructions li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.upload-section {
  margin-top: 20px;
  padding: 20px;
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--border-color);
}

.drop-zone {
  border: 3px dashed var(--border-color);
  border-radius: 8px;
  padding: 40px 20px;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
  background-color: #fafafa;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--primary-color);
  background-color: #e3f2fd;
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
}

.upload-icon {
  width: 64px;
  height: 64px;
  color: var(--primary-color);
}

.drop-text {
  font-size: 1.1rem;
  color: var(--text-color);
  margin: 0;
}

.drop-text-or {
  font-size: 0.9rem;
  color: #999;
  margin: 0;
}

.file-info {
  margin-top: 15px;
  padding: 15px;
  background-color: #e8f5e9;
  border: 1px solid #4caf50;
  border-radius: 6px;
  color: #2e7d32;
}

.data-info {
  padding: 8px 12px;
  background-color: #e8f5e9;
  border: 1px solid #4caf50;
  border-radius: 4px;
  color: #2e7d32;
  font-weight: 500;
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.filters-section {
  position: sticky;
  top: 20px;
  z-index: 100;
  margin-bottom: 40px;
  padding: 20px 30px;
  background-color: var(--card-bg);
  border: 2px solid var(--primary-color);
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
}

.filters-header {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  padding: 4px 0;
}

.filters-header:hover {
  opacity: 0.8;
}

.collapse-icon {
  font-size: 0.7rem;
  color: var(--primary-color);
  transition: transform 0.3s;
  flex-shrink: 0;
}

.filters-header[aria-expanded="false"] .collapse-icon {
  transform: rotate(-90deg);
}

.header-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-color);
}

.filters-content {
  display: flex;
  flex-direction: column;
  gap: 15px;
  overflow-y: auto;
  overflow-x: hidden;
  transition: max-height 0.3s ease-out, opacity 0.3s ease-out;
  max-height: 500px;
  opacity: 1;
}

.filters-content.collapsed {
  max-height: 0;
  opacity: 0;
  margin: 0;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 15px;
  flex-wrap: wrap;
}

.filter-group label {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-color);
}

.filter-group select {
  padding: 8px 16px;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background-color: white;
  cursor: pointer;
  transition: border-color 0.3s;
}

.filter-group select:focus {
  outline: none;
  border-color: var(--primary-color);
}

.filter-group select:hover {
  border-color: #999;
}

.filter-group select:disabled {
  background-color: #f5f5f5;
  cursor: not-allowed;
  opacity: 0.7;
  border-color: var(--border-color);
}

/* Special styling for runner selection with dynamic selectors */
.filter-group.runner-selection-group {
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
}

#runner-selectors-container {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.runner-selector-row {
  display: flex;
  gap: 8px;
  align-items: center;
  width: 100%;
  max-width: 100%;
  overflow: visible; /* Changed to allow dropdown to show */
}

.runner-selector-container {
  position: relative;
  flex: 1 1 auto;
  min-width: 0;
  max-width: 100%;
}

.runner-selector-input {
  width: 100%;
  padding: 8px 16px;
  font-size: 1rem;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  background-color: white;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.runner-selector-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.runner-selector-input:hover {
  border-color: #999;
}

.runner-selector-input::placeholder {
  color: #999;
}

.runner-selector-dropdown {
  position: fixed;
  max-height: 300px;
  overflow-y: auto;
  background: white;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  z-index: 10000;
}

.runner-selector-item {
  padding: 10px 16px;
  cursor: pointer;
  transition: background-color 0.15s;
  border-bottom: 1px solid #f0f0f0;
}

.runner-selector-item:last-child {
  border-bottom: none;
}

.runner-selector-item:hover,
.runner-selector-item.focused {
  background-color: #e3f2fd;
}

.runner-selector-item.no-results {
  color: #999;
  cursor: default;
  text-align: center;
  font-style: italic;
}

.runner-selector-item.no-results:hover {
  background-color: white;
}

.remove-runner-btn {
  padding: 8px;
  background-color: #f44336;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.remove-runner-btn:hover {
  background-color: #d32f2f;
}

.remove-runner-btn svg {
  display: block;
}

.add-runner-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background-color: var(--primary-color);
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  transition: background-color 0.3s;
  align-self: flex-start;
}

.add-runner-btn:hover {
  background-color: #1565c0;
}

.add-runner-btn svg {
  display: block;
  flex-shrink: 0;
}

.distance-info {
  color: #666;
  font-size: 0.9rem;
  font-style: italic;
}

.stored-results-section {
  background: var(--card-bg);
  padding: 30px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  margin-bottom: 40px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  flex-wrap: wrap;
  gap: 15px;
}

.section-header h2 {
  font-size: 1.5rem;
  color: var(--text-color);
  margin: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
  font-size: 0.9rem;
  color: #666;
}

.stored-results-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 15px;
  margin-bottom: 20px;
}

.storage-info-footer {
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
  font-size: 0.9rem;
  color: #666;
  line-height: 1.6;
}

.storage-info-footer small {
  display: block;
  margin-top: 5px;
}

.empty-message {
  grid-column: 1 / -1;
  text-align: center;
  padding: 40px 20px;
  color: #999;
  font-style: italic;
}

.result-card {
  background: #fafafa;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 15px;
  transition: all 0.3s;
  cursor: pointer;
}

.result-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 2px 8px rgba(31, 119, 180, 0.1);
  transform: translateY(-2px);
}

.result-card-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 10px;
}

.result-name {
  font-weight: 600;
  color: var(--text-color);
  font-size: 1rem;
  word-break: break-word;
  flex: 1;
  padding: 2px 4px;
  border-radius: 3px;
  outline: none;
  transition: background-color 0.2s;
  cursor: text;
}

.result-name:hover {
  background-color: #f0f0f0;
}

.result-name:focus {
  background-color: white;
  box-shadow: 0 0 0 2px var(--primary-color);
}

.delete-btn {
  background: none;
  border: none;
  color: #d32f2f;
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.delete-btn:hover {
  background-color: #ffebee;
}

.result-meta {
  font-size: 0.85rem;
  color: #666;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.result-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.result-url {
  display: flex;
  align-items: center;
  gap: 8px;
}

.result-url a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s;
}

.result-url a:hover {
  color: #1565c0;
  text-decoration: underline;
}

.no-url {
  color: #999;
  font-style: italic;
}

.edit-url-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  padding: 2px 4px;
  border-radius: 3px;
  transition: background-color 0.2s;
  opacity: 0.7;
}

.edit-url-btn:hover {
  background-color: #f0f0f0;
  opacity: 1;
}

.result-actions {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.analyze-stored-btn {
  width: 100%;
  padding: 8px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  color: white;
  background-color: var(--primary-color);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.analyze-stored-btn:hover {
  background-color: #1565c0;
}

.danger-btn-small {
  padding: 6px 12px;
  font-size: 0.85rem;
  font-weight: 600;
  color: white;
  background-color: var(--error-color);
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.3s;
}

.danger-btn-small:hover {
  background-color: #b71c1c;
}

/* Visualization actions container */
.viz-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 15px;
  flex-wrap: wrap;
}

/* Download PNG button */
.download-png-btn {
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: white;
  background-color: #2196f3;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.1s;
}

.download-png-btn:hover {
  background-color: #1976d2;
}

.download-png-btn:active {
  transform: scale(0.98);
}

/* Share visualization button */
.share-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: white;
  background-color: #4caf50;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.1s;
}

.share-btn:hover {
  background-color: #45a049;
}

.share-btn:active {
  transform: scale(0.98);
}

.share-btn svg {
  flex-shrink: 0;
}

/* Share modal */
.share-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: 20px;
  overflow-y: auto;
}

.share-modal {
  background: white;
  border-radius: 12px;
  max-width: 700px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.share-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px;
  border-bottom: 2px solid #e0e0e0;
}

.share-modal-header h3 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--text-color);
}

.share-modal-close {
  background: none;
  border: none;
  font-size: 2rem;
  line-height: 1;
  color: #999;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background-color 0.2s, color 0.2s;
}

.share-modal-close:hover {
  background-color: #f0f0f0;
  color: #333;
}

.share-modal-content {
  padding: 20px;
}

.share-preview {
  display: flex;
  justify-content: center;
  margin-bottom: 20px;
  background: #f5f5f5;
  padding: 20px;
  border-radius: 8px;
}

.share-preview svg {
  max-width: 100%;
  height: auto;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.share-actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.share-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 16px;
  font-size: 0.95rem;
  font-weight: 600;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
}

.share-action-btn:hover {
  transform: translateY(-2px);
  opacity: 0.9;
}

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

.share-action-btn.native-share-btn {
  background-color: #4caf50;
}

.share-action-btn.native-share-btn:hover {
  background-color: #45a049;
}

.share-action-btn.twitter-btn {
  background-color: #000000;
}

.share-action-btn.facebook-btn {
  background-color: #1877f2;
}

.share-info {
  padding: 16px;
  background: #e3f2fd;
  border-left: 4px solid var(--primary-color);
  border-radius: 4px;
}

.share-info p {
  margin: 0;
  font-size: 0.9rem;
  color: #333;
}

.share-info a {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
}

.share-info a:hover {
  text-decoration: underline;
}

.share-support {
  padding: 16px;
  background: #fff3e0;
  border-left: 4px solid #ff6b6b;
  border-radius: 4px;
  margin-top: 12px;
}

.share-support p {
  margin: 0;
  font-size: 0.9rem;
  color: #333;
}

.share-support a {
  color: #ff6b6b;
  font-weight: 600;
  text-decoration: none;
}

.share-support a:hover {
  color: #ee5a52;
  text-decoration: underline;
}

@media (max-width: 768px) {
  header h1 {
    font-size: 1.8rem;
  }
  
  .input-section {
    padding: 20px;
  }
  
  .visualization {
    padding: 20px;
  }
  
  .stored-results-list {
    grid-template-columns: 1fr;
  }
  
  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  /* Fix runner selector on mobile */
  .runner-selector-row {
    gap: 6px;
    flex-wrap: wrap;
  }
  
  .runner-selector-input {
    padding: 8px 12px;
    font-size: 1rem; /* Keep 1rem for better mobile readability */
  }
  
  .runner-selector-dropdown {
    font-size: 0.95rem;
    max-height: 250px;
  }
  
  .runner-selector-item {
    padding: 10px 12px;
  }
  
  .remove-runner-btn {
    padding: 6px;
    flex-shrink: 0;
  }
  
  .remove-runner-btn svg {
    width: 14px;
    height: 14px;
  }
  
  .viz-actions {
    flex-direction: column;
  }
  
  .viz-actions button {
    width: 100%;
  }
  
  .share-actions {
    grid-template-columns: 1fr;
  }
  
  .share-modal {
    margin: 10px;
  }
}