:root {
  color-scheme: light;
  font-family: "Inter", "Segoe UI", system-ui, sans-serif;
  background: #f8fafc;
  color: #0f172a;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary: #64748b;
  --bg-card: #ffffff;
  --bg-page: #f8fafc;
  --border-color: #e2e8f0;
  --text-main: #0f172a;
  --text-muted: #475569;
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--bg-page);
  /* Removed position: relative from body as we want positioning relative to .page now */
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  position: relative; /* Make .page the positioning context */
}

.github-link {
  position: absolute;
  top: 40px; /* Align with the top padding of .page */
  right: 24px; /* Align with the right padding of .page */
  color: var(--text-main);
  opacity: 0.7;
  transition: opacity 0.2s, transform 0.2s;
  z-index: 1000;
}

.github-link:hover {
  opacity: 1;
  transform: scale(1.1);
  color: var(--primary);
}

.github-link svg {
  fill: currentColor;
}

.hero h1 {
  margin: 0 0 8px;
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  padding-right: 48px; /* Avoid text overlapping with the icon on small screens */
}

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

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border-color);
  margin-bottom: var(--space-lg);
}

.hidden {
  display: none !important;
}

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

.drop-zone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-xl);
  text-align: center;
  transition: all 0.3s ease;
  cursor: pointer;
  background: #f8fafc;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.drop-zone:hover,
.drop-zone--over {
  border-color: var(--primary);
  background: #eff6ff;
}

.drop-zone__prompt {
  font-weight: 500;
  color: var(--text-muted);
}

.drop-zone__input {
  display: none;
}

.hint {
  margin: 6px 0 0;
  color: #64748b;
  font-size: 0.9rem;
}

.hint-box {
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 16px;
  background: #f1f5f9;
  text-align: left;
  margin-top: var(--space-lg);
}

.hint-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.hint-box h3 {
  margin: 0;
  font-size: 1rem;
}

.error {
  color: #dc2626;
  min-height: 20px;
  margin: 0;
  font-weight: 500;
}

.primary-btn,
.secondary-btn {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 600;
  cursor: pointer;
}

.primary-btn {
  background: #2563eb;
  color: #ffffff;
}

.primary-btn:disabled,
.secondary-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.spinner {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 4px solid #e2e8f0;
  border-top-color: #2563eb;
  animation: spin 1s linear infinite;
}

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

.ready-header h2 {
  margin: 0 0 6px;
}

.ready-header p {
  margin: 0 0 20px;
  color: #475569;
}

.results-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: stretch;
  min-width: 0;
}

.results-grid.single-column {
  grid-template-columns: 1fr;
}

.panel {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  background: #f8fafc;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  position: relative;
  min-width: 0;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.icon-btn {
  background: none;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.2s;
}

.icon-btn:hover {
  background: #f1f5f9;
  color: var(--primary);
  border-color: var(--primary);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

/* Layout */
.main-content {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-lg);
  align-items: start;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.content-area {
  min-width: 0;
}

/* File List */
.file-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  margin-bottom: 4px;
  background-color: rgba(255, 255, 255, 0.05);
}

.file-item:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateX(4px);
}

.file-item.active {
  background-color: var(--primary);
  color: white;
}

.file-item .file-name {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 0.9rem;
}

.file-actions {
  display: flex;
  gap: 4px;
}

.delete-btn {
  background: none;
  border: none;
  color: #ff4444;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.delete-btn:hover {
  opacity: 1;
}

.file-item.active .delete-btn {
  color: white;
}

.empty-list {
  text-align: center;
  color: var(--text-muted);
  font-style: italic;
  padding: var(--space-md);
}

/* Welcome Box */
.welcome-box {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
}

.welcome-box h2 {
  font-size: 2rem;
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.panel-title {
  font-weight: 600;
}

.code-block {
  margin: 0;
  padding: 12px;
  border-radius: 10px;
  border: 1px solid #e2e8f0;
  background: #0f172a;
  color: #e2e8f0;
  font-family: "JetBrains Mono", "Courier New", monospace;
  font-size: 0.85rem;
  max-height: 320px;
  overflow: auto;
  white-space: pre-wrap;
}

/* Removed arrow styles */
/* Filter styles */
.filter-group {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.filter-group input[type="text"] {
  padding: 0.4rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  width: 100%;
  max-width: 200px;
}

.viz-menu h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.viz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.secondary-btn {
  background: #ffffff;
  color: #2563eb;
  border: 1px solid #bfdbfe;
}

.sample-chip {
  background-color: #f1f5f9;
  border: 1px solid #e2e8f0;
  border-radius: 9999px;
  padding: 4px 12px;
  font-size: 0.85rem;
  color: #475569;
  cursor: pointer;
  transition: all 0.2s;
}

.sample-chip:hover {
  background-color: #e2e8f0;
  color: #1e293b;
  border-color: #cbd5e1;
}

@media (max-width: 900px) {
  .results-grid {
    grid-template-columns: 1fr;
  }

  .arrow-panel {
    order: 2;
  }
}