:root {
  --bg: #f7f7f5;
  --panel-bg: #ffffff;
  --border: #e2e0da;
  --text: #2b2a27;
  --muted: #767468;
  --accent: #b3441f;
  --accent-soft: #e8c9ba;
  --grid: #e8e6df;
  --tube: #2b2a27;
  --tube-seat: #b3441f;
  --tube-top: #3f6b4d;
  --tube-down: #35577d;
  --dim: #767468;
  --wheel: #55524a;
  --fork: #35577d;
  --stay: #8a5a2b;
  --cockpit: #6a4c93;
  --saddle: #2b2a27;
  --ground: #c9c6bb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1c1b19;
    --panel-bg: #26241f;
    --border: #3a382f;
    --text: #ecebe6;
    --muted: #a6a396;
    --accent: #e08a5b;
    --accent-soft: #4a3226;
    --grid: #33312a;
    --tube: #ecebe6;
    --tube-seat: #e08a5b;
    --tube-top: #7fbf94;
    --tube-down: #7fa8d9;
    --dim: #a6a396;
    --wheel: #c9c6bb;
    --fork: #7fa8d9;
    --stay: #d1a05f;
    --cockpit: #b79ce0;
    --saddle: #ecebe6;
    --ground: #46443b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 48px;
}

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

.subtitle {
  color: var(--muted);
  margin: 4px 0 20px;
  font-size: 0.95rem;
}

.header-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.lang-switch {
  display: flex;
  flex: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.lang-btn {
  font: inherit;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--panel-bg);
  border: none;
  padding: 6px 12px;
  cursor: pointer;
}

.lang-btn + .lang-btn { border-left: 1px solid var(--border); }
.lang-btn:hover { color: var(--text); }
.lang-btn.active { background: var(--accent); color: #fff; }

main {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.panel h2 {
  font-size: 1rem;
  margin: 0 0 14px;
}

#geo-form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px 16px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

input[type="number"] {
  width: 100%;
  min-width: 0;
  font: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 10px;
}

input[type="number"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

input[type="number"]:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

input[type="number"]:read-only {
  opacity: 0.6;
  cursor: default;
  background: var(--panel-bg);
}

.field-with-action {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-width: 0;
}

.field-with-action input {
  flex: 1 1 80px;
  min-width: 60px;
}

.btn-mini {
  flex: none;
  font: inherit;
  font-size: 0.75rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0 8px;
  cursor: pointer;
  white-space: nowrap;
}

.btn-mini:hover { border-color: var(--accent); }
.btn-mini:disabled { opacity: 0.5; cursor: not-allowed; }

.extra {
  grid-column: 1 / -1;
  margin-top: 4px;
  border-top: 1px solid var(--border);
  padding-top: 10px;
}

.extra summary {
  cursor: pointer;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 600;
}

.extra-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px 16px;
  margin-top: 10px;
}

.extra-grid label {
  font-size: 0.78rem;
}

.derived {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.derived h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 0 0 10px;
}

dl {
  margin: 0;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 10px;
  font-size: 0.9rem;
}

dt { color: var(--muted); }
dd { margin: 0; font-weight: 600; text-align: right; }

.note {
  margin: 12px 0 0;
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.4;
}

.bike-list,
.data-files-list {
  list-style: none;
  margin: 0 0 10px;
  padding: 0;
  display: flex;
  gap: 6px;
}

.bike-list {
  flex-flow: row wrap;
}

.data-files-heading {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 4px 0 8px;
}

.data-files-list {
  flex-direction: column;
}

.data-file-group {
  border: 1px dashed var(--border);
  border-radius: 8px;
  padding: 2px 0;
}

.data-file-group-header {
  display: flex;
  align-items: center;
  gap: 4px;
  padding-right: 8px;
}

.data-file-toggle {
  flex: 1;
  min-width: 0;
  text-align: left;
  font: inherit;
  font-size: 0.82rem;
  color: var(--text);
  background: none;
  border: none;
  padding: 6px 10px;
  cursor: pointer;
}

.data-file-toggle:hover { color: var(--accent); }
.data-file-toggle:disabled { opacity: 0.6; cursor: wait; }

.data-file-group-add {
  flex: none;
  font: inherit;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: none;
  border-radius: 6px;
  padding: 4px 8px;
  cursor: pointer;
  white-space: nowrap;
}

.data-file-group-add:hover { filter: brightness(0.95); }
.data-file-group-add:disabled { opacity: 0.4; cursor: not-allowed; }

.data-file-bikes {
  list-style: none;
  margin: 0;
  padding: 2px 10px 8px 22px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.data-file-bikes[hidden] {
  display: none;
}

.data-file-bike-row {
  padding: 2px 0;
}

.data-file-bike-row[hidden] {
  display: none;
}

.data-file-bike-name {
  display: block;
  width: 100%;
  text-align: left;
  font: inherit;
  font-size: 0.8rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 8px;
  cursor: pointer;
}

.data-file-bike-name:hover { border-color: var(--accent); color: var(--accent); }

.data-file-bike-empty {
  font-size: 0.78rem;
  color: var(--muted);
  padding: 3px 0;
}

.bike-list-empty {
  color: var(--muted);
  font-size: 0.85rem;
}

.bike-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 5px 6px;
}

.bike-row.active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.bike-swatch {
  width: 10px;
  height: 10px;
  min-width: 10px;
  border-radius: 50%;
}

.bike-select {
  flex: 0 0 auto;
  text-align: left;
  background: none;
  border: none;
  font: inherit;
  font-size: 0.85rem;
  color: var(--text);
  cursor: pointer;
  padding: 2px 0;
  white-space: nowrap;
}

.bike-icon-btn {
  border: none;
  background: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  line-height: 1;
  padding: 3px 5px;
  border-radius: 4px;
}

.bike-icon-btn:hover { background: var(--border); color: var(--text); }
.bike-icon-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.bike-icon-btn:disabled:hover { background: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font: inherit;
  font-size: 0.8rem;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 8px;
  cursor: pointer;
  text-align: center;
}

.btn-secondary:hover { border-color: var(--accent); }

.bike-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.bike-actions-row > * {
  flex: 1 1 auto;
  min-width: 140px;
}

.canvas-wrap {
  background: var(--panel-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  aspect-ratio: 4 / 3;
  display: flex;
}

@media (max-width: 600px) {
  .app {
    padding-left: 8px;
    padding-right: 8px;
  }

  .canvas-wrap {
    padding: 6px 0;
    margin-left: -8px;
    margin-right: -8px;
    border-radius: 0;
    border-left: none;
    border-right: none;
  }
}

.align-hint {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.align-hint strong { color: var(--text); }

#frame-svg {
  width: 100%;
  height: 100%;
}

.grid-line { stroke: var(--grid); stroke-width: 1; }
.axis-line { stroke: var(--muted); stroke-width: 1; opacity: 0.5; }

.tube { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.tube-main { stroke: var(--tube); stroke-width: 6; }
.tube-seat { stroke: var(--tube-seat); stroke-width: 6; }
.tube-top { stroke: var(--tube-top); stroke-width: 6; }
.tube-down { stroke: var(--tube-down); stroke-width: 6; }
.tube-ett { stroke: var(--dim); stroke-width: 1.5; stroke-dasharray: 4 4; }

.joint { fill: var(--panel-bg); stroke: var(--tube); stroke-width: 2; cursor: pointer; }
.joint:hover { stroke: var(--accent); stroke-width: 3; }
.joint-align { fill: var(--accent); stroke: var(--accent); }

.wheel { fill: none; stroke: var(--wheel); stroke-width: 3; }
.hub { fill: var(--wheel); }
.ground-line { stroke: var(--ground); stroke-width: 2; stroke-dasharray: 2 5; }
.tube-fork { stroke: var(--fork); stroke-width: 5; fill: none; stroke-linecap: round; }
.tube-stay { stroke: var(--stay); stroke-width: 4; fill: none; stroke-linecap: round; }
.tube-cockpit { stroke: var(--cockpit); stroke-width: 4; fill: none; stroke-linecap: round; stroke-linejoin: round; }
.tube-spacers { stroke: var(--cockpit); stroke-width: 6; stroke-dasharray: 2 2; fill: none; stroke-linecap: butt; opacity: 0.7; }
.bar-ring { fill: none; stroke: var(--cockpit); stroke-width: 3; cursor: pointer; }
.bar-ring:hover { stroke: var(--accent); stroke-width: 4; }
.bar-ring-align { stroke: var(--accent); stroke-width: 4; }
.saddle-line { stroke: var(--saddle); stroke-width: 6; stroke-linecap: round; }
.seatpost { stroke: var(--tube-seat); stroke-width: 3.5; stroke-linecap: round; }

.dim-line { stroke: var(--dim); stroke-width: 1; }
.dim-label {
  fill: var(--dim);
  font-size: 12px;
  font-family: inherit;
}

.point-label {
  fill: var(--text);
  font-size: 11px;
  font-weight: 600;
}

.ghost-group { opacity: 0.55; }
.ghost-line { fill: none; stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; }
.ghost-wheel { fill: none; stroke-width: 2; }

.nametag-line { stroke-width: 1.5; opacity: 0.9; }
.nametag-line-active { stroke: var(--accent); }
.nametag-text {
  font-size: 12px;
  font-weight: 700;
  paint-order: stroke;
  stroke: var(--panel-bg);
  stroke-width: 3px;
}
.nametag-text-active { fill: var(--accent); }
.arrow-active-fill { fill: var(--accent); }