:root {
  --bg: #0f1115;
  --panel: #262f42;
  --panel-2: #1f2430;
  --text: #e8ecf1;
  --muted: #aab4c0;
  --accent: #7cc4ff;
  --border: #2b3240;
  --ok: #8ee28e;
  --warn: #ffd27a;
  --danger: #ff9a9a;
}

* { box-sizing: border-box; }

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

.app {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
  flex-wrap: wrap;
  gap: 10px;
}

.tabs {
  display: flex;
  gap: 8px;
}

.tab {
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px solid #2c3440;
  background: #161b22;
  color: #c9d1d9;
  font-size: 14px;
  cursor: pointer;
}

.tab:hover {
  background: #1f2630;
}

.tab.active {
  background: #3976a9;
  border-color: #326b9a;
  color: white;
}

.units {
  font-size: 13px;
  color: #8b949e;
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
}

.controls {
  margin-bottom: 20px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
}

.dimensions {
  margin-bottom: 12px;
}

.dimensions-label {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.dimensions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.dimensions-row label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
  cursor: text;
}

.dimensions-row label input {
  cursor: text;
}

.dimensions-row input[type="number"] {
  width: 4.5em;
  min-width: 56px;
}

input[type="number"],
input[type="text"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  font-size: 15px;
}

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

.controls-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.btn-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button, a.button-link {
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
  text-align: center;
}

button.primary {
  background: var(--accent);
  color: #081018;
  border-color: transparent;
  font-weight: 600;
}

button:disabled, a.button-link.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.viewer-container {
  position: relative;
  margin-bottom: 20px;
}

.viewer-overlay-btn {
  position: absolute;
  padding: 8px 14px;
  border-radius: 6px;
  background: #2a2f3a;
  color: white;
  font-size: 13px;
  z-index: 10;
  text-decoration: none;
  display: inline-block;
  border: none;
  cursor: pointer;
}

.viewer-overlay-btn:hover {
  background: #353b48;
}

.viewer-overlay-btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.download-view {
  top: 20px;
  left: 20px;
}

.fit-view {
  bottom: 20px;
  right: 20px;
}

.hidden {
  display: none;
}

.viewer {
  position: relative;
  width: 100%;
  max-width: 900px;
  height: 500px;
  margin: 0 auto 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #0b0d12;
  overflow: hidden;
}

.viewer canvas {
  width: 100% !important;
  height: 100% !important;
  display: block;
}

.viewer-hint {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.model-info {
  font-size: 13px;
  color: var(--muted);
}

.status {
  min-height: 22px;
  font-size: 14px;
  color: var(--muted);
}

.status-inline {
  min-height: 22px;
}

.status.ok { color: var(--ok); }
.status.warn { color: var(--warn); }
.status.error { color: var(--danger); }

@media (max-width: 640px) {
  .dimensions-row {
    gap: 10px;
  }
}

@media (max-width: 768px) {
  .viewer {
    aspect-ratio: 1 / 1;
    height: auto;
    max-height: none;
  }
}

@media (min-width: 769px) {
  .tab {
    padding: 8px 18px;
    font-size: 16px;
  }

  .units {
    font-size: 15px;
  }

  .dimensions-row label {
    font-size: 16px;
  }

  .dimensions-row input[type="number"] {
    padding: 10px 12px;
    font-size: 17px;
    min-width: 60px;
  }

  button,
  a.button-link {
    padding: 12px 22px;
    font-size: 16px;
  }

  .viewer-overlay-btn {
    padding: 10px 18px;
    font-size: 14px;
  }

  .status {
    font-size: 16px;
    min-height: 24px;
  }

  .model-info {
    font-size: 14px;
  }
}