:root {
  color-scheme: light;
  --bg: #f4f5f7;
  --surface: #ffffff;
  --surface-2: #eef0f3;
  --border: #d6d9de;
  --text: #15181d;
  --text-2: #5b6370;
  --accent: #2a78d6;
  --accent-text: #ffffff;
  --danger: #c43d3d;
  --radius: 8px;
  --sidebar-w: 320px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #121417;
    --surface: #1b1e23;
    --surface-2: #23272e;
    --border: #353a43;
    --text: #f1f2f4;
    --text-2: #a7adb8;
    --accent: #3987e5;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 8px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.brand-mark { font-size: 20px; }
.brand-name { font-weight: 700; font-size: 18px; }
.brand-sub { color: var(--text-2); font-size: 12px; }
.tabs { display: flex; gap: 4px; flex: 1; }
.tab {
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--text-2);
  padding: 6px 12px;
  cursor: pointer;
  font: inherit;
}
.tab:hover { background: var(--surface-2); }
.tab.active { background: var(--surface-2); color: var(--text); border-color: var(--border); font-weight: 600; }
.repo-link { color: var(--text-2); text-decoration: none; font-size: 13px; }
.repo-link:hover { color: var(--text); text-decoration: underline; }

.privacy-note {
  margin: 0;
  padding: 4px 16px;
  font-size: 12px;
  color: var(--text-2);
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
}

.panel {
  display: none;
  flex: 1;
  min-height: 0;
}
.panel.active { display: flex; }
.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  padding: 12px 16px 24px;
  overflow-y: auto;
  background: var(--surface);
  border-right: 1px solid var(--border);
}
.sidebar h2 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-2);
  margin: 18px 0 6px;
}
.sidebar h2:first-child { margin-top: 4px; }
.plot-area {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  padding: 12px 16px;
}
.plot { flex: 1; min-height: 420px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.status { margin: 8px 0 0; color: var(--text-2); font-size: 13px; min-height: 1.4em; }
.status.error { color: var(--danger); }

.hint { color: var(--text-2); font-size: 12px; margin: 4px 0 0; }
.fileinfo { font-size: 12px; margin-top: 6px; padding: 6px 8px; background: var(--surface-2); border-radius: var(--radius); word-break: break-all; }

button, input, select {
  font: inherit;
  color: var(--text);
}
button {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 12px;
  cursor: pointer;
}
button:hover { filter: brightness(0.96); }
button.small { padding: 4px 10px; font-size: 13px; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); width: 100%; margin-top: 6px; }
button.icon { padding: 2px 6px; font-size: 12px; line-height: 1; }
button:disabled { opacity: 0.5; cursor: default; }
input[type="text"], input[type="number"], input[type="search"], select {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 8px;
  width: 100%;
  min-width: 0;
}
.file-btn { display: block; }
.file-btn input { display: none; }
.file-btn span {
  display: block;
  text-align: center;
  padding: 7px 12px;
  border: 1px dashed var(--accent);
  border-radius: var(--radius);
  color: var(--accent);
  cursor: pointer;
}
.file-btn:hover span { background: var(--surface-2); }

.row { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
.row > span { flex: 0 0 64px; color: var(--text-2); font-size: 13px; }
.row.check > span { flex: 1; }
.row.check input { flex: 0 0 auto; }
.btn-row { display: flex; gap: 6px; margin: 6px 0; align-items: center; }

.checklist {
  max-height: 220px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  background: var(--surface);
}
.checklist label {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 4px;
  font-size: 13px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.checklist label:hover { background: var(--surface-2); border-radius: 4px; }
.checklist label.hidden { display: none; }
.checklist .empty, .filelist .empty { color: var(--text-2); font-size: 12px; padding: 6px; }

.list { list-style: none; margin: 4px 0 0; padding: 0; }
.list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 3px 6px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.filelist {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 8px;
  max-height: 260px;
  overflow-y: auto;
}
.filelist .item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
  cursor: pointer;
}
.filelist .item:last-child { border-bottom: none; }
.filelist .item:hover { background: var(--surface-2); }
.filelist .item.selected { background: var(--surface-2); font-weight: 600; }
.filelist .item .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.filelist .item .meta { color: var(--text-2); font-size: 11px; }

.placeholder { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 32px; }

@media (max-width: 800px) {
  .panel.active { flex-direction: column; }
  .sidebar { width: auto; flex: 0 0 auto; border-right: none; border-bottom: 1px solid var(--border); max-height: 50vh; }
  .plot { min-height: 320px; }
}