:root {
  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --bg-canvas: #f6f8fa;
  --bg-surface: #ffffff;
  --bg-subtle: #f6f8fa;
  --bg-inset: #eaeef2;

  --border-default: #d0d7de;
  --border-muted: #e1e4e8;
  --border-active: #0969da;

  --fg-default: #1f2328;
  --fg-muted: #656d76;
  --fg-subtle: #8c959f;

  --accent-fg: #0969da;
  --accent-emphasis: #0969da;
  --accent-muted: #ddf4ff;

  --success-fg: #1a7f37;
  --success-bg: #dafbe1;
  --success-border: #4ac26b;

  --danger-fg: #cf222e;
  --danger-bg: #ffebe9;
  --danger-border: #ff8182;

  --radius-sm: 4px;
  --radius-md: 6px;
}

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

body {
  font-family: var(--font-ui);
  background-color: var(--bg-canvas);
  color: var(--fg-default);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Navigation */
.top-nav {
  height: 48px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--fg-default);
  font-weight: 600;
  font-size: 15px;
}

.nav-icon {
  color: var(--fg-default);
}

.nav-divider {
  color: var(--border-default);
}

.nav-subtitle {
  color: var(--fg-muted);
  font-size: 13px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
}

/* Page Container */
.page-container {
  flex: 1;
  width: 100%;
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Panels */
.section-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.panel-heading {
  margin-bottom: 12px;
}

.panel-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--fg-default);
}

.panel-desc {
  font-size: 13px;
  color: var(--fg-muted);
  margin-top: 2px;
}

/* Input Form */
.url-form {
  margin: 12px 0 8px 0;
}

.form-row {
  display: flex;
  gap: 8px;
  align-items: center;
}

.input-wrapper {
  flex: 1;
}

.form-input {
  width: 100%;
  padding: 7px 12px;
  font-size: 14px;
  font-family: var(--font-ui);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--fg-default);
  outline: none;
}

.form-input:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 2px rgba(9, 105, 218, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  font-family: var(--font-ui);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  cursor: pointer;
  transition: all 0.15s ease;
  line-height: 20px;
  white-space: nowrap;
}

.btn-primary {
  background: #1f883d;
  color: #ffffff;
  border-color: rgba(31, 35, 40, 0.15);
  box-shadow: 0 1px 0 rgba(31, 35, 40, 0.04);
}

.btn-primary:hover:not(:disabled) {
  background: #1a7f37;
}

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

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--fg-default);
}

.btn-secondary:hover {
  background: #f3f4f6;
  border-color: #1b1f2426;
}

.btn-sm {
  font-size: 12px;
  padding: 4px 10px;
}

.btn-spinner {
  display: none;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn.is-loading .btn-spinner {
  display: inline-block;
}

.btn.is-loading .btn-text {
  display: none;
}

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

/* Examples Row */
.examples-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--fg-muted);
  margin-top: 4px;
}

.text-link-btn {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  color: var(--accent-fg);
  cursor: pointer;
  font-family: var(--font-ui);
  text-decoration: none;
}

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

.examples-sep {
  color: var(--fg-subtle);
}

/* Alert Banner */
.alert-banner {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
}

.alert-error {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-fg);
}

.alert-icon {
  font-size: 16px;
  font-weight: 700;
}

/* Loading Panel */
.loading-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.spinner-icon {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-default);
  border-top-color: var(--accent-fg);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

.loading-text strong {
  display: block;
  font-size: 14px;
  color: var(--fg-default);
}

.loading-text span {
  font-size: 12px;
  color: var(--fg-muted);
}

/* Results Layout */
.results-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Repo Header Bar */
.repo-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
}

.repo-info {
  display: flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
}

.repo-label {
  font-size: 12px;
  color: var(--fg-muted);
  font-weight: 500;
}

.repo-name {
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--fg-default);
}

.repo-ext-link {
  font-size: 12px;
  color: var(--accent-fg);
  text-decoration: none;
}

.repo-ext-link:hover {
  text-decoration: underline;
}

.repo-toolbar-actions {
  display: flex;
  gap: 8px;
}

/* Horizontal Stats Summary Strip */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.stat-item {
  padding: 12px 16px;
  border-right: 1px solid var(--border-default);
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-item:last-child {
  border-right: none;
}

.stat-key {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--fg-muted);
  font-weight: 500;
}

.stat-num {
  font-size: 18px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--fg-default);
}

.stat-item.has-danger .stat-num {
  color: var(--danger-fg);
}

/* Graph Panel */
.graph-heading-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 10px;
}

.graph-legend {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  color: var(--fg-muted);
}

.legend-entry {
  display: flex;
  align-items: center;
  gap: 5px;
}

.swatch {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.swatch-node {
  background: #ffffff;
  border: 1.5px solid #656d76;
}

.swatch-hotspot {
  background: #ffebe9;
  border: 1.5px solid #cf222e;
}

/* Graph Controls Bar */
.graph-controls-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 12px;
  padding: 8px 12px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
}

.segmented-control {
  display: flex;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  padding: 2px;
}

.segment-btn {
  background: transparent;
  border: none;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 3px;
  color: var(--fg-muted);
  cursor: pointer;
}

.segment-btn:hover {
  color: var(--fg-default);
}

.segment-btn.is-active {
  background: var(--bg-inset);
  color: var(--fg-default);
  font-weight: 600;
}

.graph-filter-input-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-input {
  padding: 4px 8px;
  font-size: 12px;
  font-family: var(--font-ui);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--fg-default);
  outline: none;
  width: 180px;
}

.filter-input:focus {
  border-color: var(--border-active);
}

.count-tag {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--fg-muted);
}

/* Inspector HUD */
.inspector-hud {
  background: #24292f;
  color: #ffffff;
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 12px;
}

.hud-item-file {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hud-tag {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(255, 255, 255, 0.15);
  padding: 1px 5px;
  border-radius: 2px;
}

.hud-item-file code {
  font-family: var(--font-mono);
  color: #58a6ff;
}

.hud-item-stats {
  display: flex;
  align-items: center;
  gap: 12px;
}

.hud-metric {
  color: #8b949e;
}

.hud-metric strong {
  color: #ffffff;
}

.badge-danger {
  background: #f8514933;
  color: #ff7b72;
  border: 1px solid #f8514966;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 2px;
  text-transform: uppercase;
  font-weight: 600;
}

/* Graph Viewport */
.graph-viewport-box {
  background: #ffffff;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  min-height: 420px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.graph-viewport-box svg {
  display: block;
  width: 100%;
  min-width: 600px;
  height: auto;
}

.graph-edge {
  stroke: #d0d7de;
  stroke-width: 1.25;
  transition: stroke 0.15s, opacity 0.15s;
}

.graph-edge.is-incoming {
  stroke: #1a7f37 !important;
  stroke-width: 2 !important;
}

.graph-edge.is-outgoing {
  stroke: #0969da !important;
  stroke-width: 2 !important;
}

.graph-edge.is-dimmed {
  opacity: 0.08 !important;
}

.graph-node-group {
  cursor: pointer;
}

.graph-node-group.is-dimmed {
  opacity: 0.12 !important;
}

.graph-node-group:hover circle,
.graph-node-group.is-hovered circle {
  stroke: var(--accent-emphasis) !important;
  stroke-width: 3px !important;
}

.graph-node-group text {
  paint-order: stroke;
  stroke: #ffffff;
  stroke-width: 3px;
  stroke-linejoin: round;
  user-select: none;
  font-family: var(--font-mono);
}

/* Details Grid */
.details-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(460px, 1fr));
  gap: 16px;
}

/* Tables */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
}

.data-grid-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.data-grid-table th,
.data-grid-table td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border-muted);
}

.data-grid-table th {
  background: var(--bg-subtle);
  color: var(--fg-muted);
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.data-grid-table tr:last-child td {
  border-bottom: none;
}

.data-grid-table tbody tr:hover {
  background-color: #f6f8fa;
}

.data-grid-table td.code-font {
  font-family: var(--font-mono);
  font-size: 12px;
}

.text-right {
  text-align: right !important;
}

.text-muted-cell {
  color: var(--fg-muted);
  font-style: italic;
  padding: 16px 12px !important;
}

/* Git Summary Pills */
.git-stat-pills {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.git-pill {
  font-size: 11px;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
}

.git-added {
  color: var(--success-fg);
  background: var(--success-bg);
  border-color: var(--success-border);
}

.git-modified {
  color: #9a6700;
  background: #fff8c5;
  border-color: #d4a72c;
}

.git-deleted {
  color: var(--danger-fg);
  background: var(--danger-bg);
  border-color: var(--danger-border);
}

/* Cycles View */
.cycles-view {
  font-size: 13px;
}

.cycles-chain-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.cycle-chain-item {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--danger-fg);
  word-break: break-all;
}

.no-cycles-box {
  color: var(--success-fg);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Impact Table */
.impact-table-wrap {
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  overflow-x: auto;
}

/* Raw JSON Viewer */
.json-viewer-pre {
  background: #0d1117;
  color: #e6edf3;
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  max-height: 380px;
  overflow: auto;
  border: 1px solid #30363d;
}

/* Footer */
.bottom-footer {
  height: 40px;
  border-top: 1px solid var(--border-default);
  background: var(--bg-surface);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  font-size: 12px;
  color: var(--fg-muted);
  margin-top: auto;
}

/* Responsive */
@media (max-width: 768px) {
  .top-nav {
    padding: 0 16px;
  }
  .nav-subtitle, .nav-divider {
    display: none;
  }
  .page-container {
    padding: 0 12px;
    margin: 12px auto;
  }
  .form-row {
    flex-direction: column;
    align-items: stretch;
  }
  .details-grid {
    grid-template-columns: 1fr;
  }
  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .bottom-footer {
    flex-direction: column;
    justify-content: center;
    height: auto;
    padding: 12px;
    gap: 4px;
    text-align: center;
  }
}