/* NanoVectorizer — Dark theme */
:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #242836;
  --border: #2e3346;
  --text: #e4e6f0;
  --text2: #8b8fa4;
  --accent: #6c5ce7;
  --accent2: #a29bfe;
  --success: #00b894;
  --danger: #e17055;
  --radius: 12px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}
header h1 {
  font-size: 1.8rem;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.subtitle { color: var(--text2); font-size: 0.9rem; margin-top: 0.3rem; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem;
}

/* Drop Zone */
.drop-section { margin-bottom: 1.5rem; }
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}
.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(108, 92, 231, 0.05);
}
.drop-icon { color: var(--text2); margin-bottom: 0.5rem; }
.drop-content p { color: var(--text2); }
.link { color: var(--accent2); cursor: pointer; text-decoration: underline; }
.hint { font-size: 0.8rem; margin-top: 0.3rem; opacity: 0.6; }

/* Preview */
.preview-section { margin-bottom: 1.5rem; }
.preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
.preview-pane h3 {
  font-size: 0.85rem;
  color: var(--text2);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.preview-container {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  overflow: hidden;
}
.preview-container canvas,
.preview-container svg {
  max-width: 100%;
  max-height: 400px;
  height: auto;
}
#svgPreview { width: 100%; display: flex; align-items: center; justify-content: center; }
#svgPreview svg { max-width: 100%; max-height: 400px; }
.info-text { font-size: 0.75rem; color: var(--text2); margin-top: 0.4rem; }

/* Progress */
.progress-section { margin-bottom: 1.5rem; }
.progress-bar-container {
  height: 6px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 3px;
  transition: width 0.15s ease;
}
.progress-text {
  font-size: 0.8rem;
  color: var(--text2);
  margin-top: 0.4rem;
  text-align: center;
}

/* Controls */
.controls-section { margin-bottom: 1.5rem; }
.controls-row {
  display: flex;
  align-items: end;
  gap: 1rem;
  flex-wrap: wrap;
}
.controls-row label {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.8rem;
  color: var(--text2);
}
.controls-row select {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.5rem 0.8rem;
  font-size: 0.9rem;
  cursor: pointer;
}
.controls-row select:focus {
  outline: none;
  border-color: var(--accent);
}

/* Buttons */
.btn {
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.1s, opacity 0.2s;
}
.btn:hover { opacity: 0.9; }
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
}
.btn-success {
  background: var(--success);
  color: #fff;
}

/* Download */
.download-section {
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}
.download-section:not([hidden]) {
  display: flex;
}

/* Ensure hidden attribute works on all sections */
[hidden] { display: none !important; }

/* Responsive */
@media (max-width: 640px) {
  .preview-grid { grid-template-columns: 1fr; }
  .controls-row { flex-direction: column; align-items: stretch; }
  .controls-row .btn { width: 100%; }
}

/* Checkerboard background for transparency */
.preview-container {
  background-image:
    linear-gradient(45deg, #1e2130 25%, transparent 25%),
    linear-gradient(-45deg, #1e2130 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #1e2130 75%),
    linear-gradient(-45deg, transparent 75%, #1e2130 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-color: var(--surface);
}