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

:root {
  --bg: #110e14;
  --surface: #1c1622;
  --surface-2: #2a1f35;
  --accent: #8f11c3;
  --accent-hover: #a83fd4;
  --accent-subtle: rgba(143, 17, 195, 0.12);
  --purple-alt: #6d2c8b;
  --purple-deep: #5f3187;
  --success: #2ecc71;
  --success-hover: #27ae60;
  --warning: #f39c12;
  --danger: #e74c3c;
  --danger-bg: rgba(231, 76, 60, 0.15);
  --text: #ede8f0;
  --text-muted: #8a7f96;
  --border: #352a42;
  --radius: 8px;
  --shadow: 0 2px 16px rgba(95, 49, 135, 0.15);
}

body {
  font-family: 'Avenir', 'Avenir Next', 'Nunito Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

.header-logo {
  height: 44px;
  width: auto;
  display: inline-block;
  vertical-align: middle;
}

header h1 {
  font-size: 1.6rem;
  color: var(--text);
  letter-spacing: 2px;
  font-weight: 300;
  margin-top: 0.5rem;
}

header h1 span {
  color: var(--accent);
  font-weight: 600;
}

.subtitle {
  color: var(--text-muted);
  margin-top: 0.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

main {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem;
  width: 100%;
}

footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.6rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-hover); }

.btn-success {
  background: var(--success);
  color: #fff;
}
.btn-success:hover { background: var(--success-hover); }

.btn-large {
  padding: 1rem 3rem;
  font-size: 1.2rem;
}

/* Upload Drop Zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 3rem 2rem;
  text-align: center;
  transition: border-color 0.3s, background 0.3s;
  cursor: pointer;
  background: var(--surface);
}
.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-subtle);
}
.drop-zone-content { pointer-events: none; }
.drop-zone-content .btn { pointer-events: auto; }

.upload-icon {
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.drop-zone p { margin: 0.5rem 0; }
.drop-hint { color: var(--text-muted); font-size: 0.9rem; }

#upload-status {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
}
#upload-status.error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger);
}
#upload-status.success {
  background: rgba(46, 204, 113, 0.15);
  color: var(--success);
  border: 1px solid var(--success);
}
#upload-status.loading {
  background: rgba(52, 152, 219, 0.15);
  color: #3498db;
  border: 1px solid #3498db;
}

/* Settings Panel */
#settings-section {
  margin-top: 1.5rem;
  background: var(--surface);
  padding: 1.5rem;
  border-radius: var(--radius);
}
#settings-section h2 {
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}
.settings-hint {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-bottom: 1rem;
}
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}
.setting-item label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.3rem;
}
.setting-item input {
  width: 100%;
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-size: 0.95rem;
}
.setting-item input:focus {
  outline: none;
  border-color: var(--accent);
}
.setting-item.full-width {
  grid-column: 1 / -1;
}

/* Preview Section */
#preview-section {
  margin-top: 1.5rem;
}
.preview-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 900px) {
  .preview-container { grid-template-columns: 1fr; }
}

.preview-panel {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem;
  overflow: hidden;
}
.preview-panel h2 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: var(--surface-2);
  border-radius: 12px;
  font-weight: normal;
}

.stats-bar {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
}
.stats-bar .stat {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}
.stat-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}
.stat-dot.compatible { background: var(--success); }
.stat-dot.incompatible { background: var(--danger); }

/* Source Table */
.table-wrapper {
  overflow-x: auto;
  max-height: 60vh;
  overflow-y: auto;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
thead th {
  position: sticky;
  top: 0;
  background: var(--surface-2);
  padding: 0.6rem 0.75rem;
  text-align: left;
  white-space: nowrap;
  z-index: 1;
}
tbody td {
  padding: 0.5rem 0.75rem;
  border-top: 1px solid var(--border);
  white-space: nowrap;
}
tbody tr:hover {
  background: rgba(255,255,255,0.03);
}
tbody tr.incompatible {
  background: var(--danger-bg);
}
tbody tr.incompatible td {
  color: #e88;
}
.status-icon {
  font-weight: bold;
}
.status-icon.ok { color: var(--success); }
.status-icon.warn { color: var(--danger); }

/* Converted Preview */
#converted-container {
  max-height: 60vh;
  overflow-y: auto;
}
.category-group {
  margin-bottom: 0.75rem;
}
.category-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: var(--surface-2);
  border-radius: 4px;
  cursor: pointer;
  user-select: none;
}
.category-header:hover { background: rgba(143, 17, 195, 0.15); }
.category-header .count { color: var(--text-muted); font-size: 0.8rem; }
.category-header .arrow {
  transition: transform 0.2s;
  color: var(--text-muted);
}
.category-header.collapsed .arrow {
  transform: rotate(-90deg);
}
.category-json {
  background: var(--bg);
  padding: 0.75rem;
  border-radius: 0 0 4px 4px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8rem;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
  line-height: 1.4;
}
.category-json.hidden { display: none; }

/* Download Section */
#download-section {
  margin-top: 1.5rem;
  text-align: center;
  padding: 1rem;
}

/* Utility */
.hidden { display: none !important; }