*,
*::before,
*::after {
  box-sizing: border-box;
}

:root {
  --bg: #0d1117;
  --surface: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #58a6ff;
  --warn: #f85149;
  --removed: #ffa657;
  --mono: "Consolas", "Courier New", monospace;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, Segoe UI, sans-serif;
  line-height: 1.45;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  align-items: center;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.1rem;
}

.site-nav a:hover {
  color: var(--accent);
}

.site-nav a.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem;
}

h1 {
  margin: 0 0 0.25rem;
  font-size: 1.5rem;
}

.tagline {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.panel h2 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2rem 1rem;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
}

.dropzone.dragover {
  border-color: var(--accent);
  color: var(--text);
}

.dropzone input {
  display: none;
}

.hidden {
  display: none !important;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 0.45rem 0.5rem;
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 600;
}

.mono,
.num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.controls {
  display: grid;
  gap: 0.75rem;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

input[type="range"] {
  width: 100%;
}

.toggle-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.toggle-row label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text);
  cursor: pointer;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.75rem;
}

.stat {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.65rem 0.75rem;
}

.stat .label {
  color: var(--muted);
  font-size: 0.8rem;
}

.stat .value {
  font-family: var(--mono);
  font-size: 1.05rem;
}

.warn {
  color: var(--warn);
}

.origin-box {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.65rem 0.75rem;
  border-radius: 6px;
  white-space: pre-wrap;
}

#previewCanvas {
  width: 100%;
  height: 420px;
  display: block;
  background: #010409;
  border: 1px solid var(--border);
  border-radius: 6px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

button,
.select-btn {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  cursor: pointer;
}

button:hover,
.select-btn:hover {
  border-color: var(--accent);
}

button.primary {
  background: #1f6feb;
  border-color: #1f6feb;
}

.feature-list {
  display: grid;
  gap: 0.5rem;
}

.feature-list button {
  text-align: left;
}

#calibrationBox {
  font-family: var(--mono);
  font-size: 0.82rem;
  white-space: pre-wrap;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.75rem;
  border-radius: 6px;
}

.hint {
  color: var(--muted);
  font-size: 0.85rem;
}

.segment-table-wrap {
  max-height: 280px;
  overflow: auto;
}