:root {
  --bg-primary: #0d1117;
  --bg-surface: #161b22;
  --bg-elevated: #1c2129;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-muted: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --error: #f85149;
  --success: #3fb950;
  --warning: #d29922;
  --radius: 8px;
}

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

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

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

/* Header */
.header {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
}

.header h1 span {
  color: var(--text-muted);
  font-weight: 400;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.btn:hover {
  background: var(--bg-surface);
  border-color: var(--text-muted);
}

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

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

.btn-danger {
  border-color: var(--error);
  color: var(--error);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Cards */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

/* Project grid */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.project-card {
  cursor: pointer;
  transition: border-color 0.15s;
}

.project-card:hover {
  border-color: var(--accent);
}

.project-card h3 {
  font-size: 16px;
  margin-bottom: 4px;
}

.project-card .meta {
  font-size: 13px;
  color: var(--text-muted);
}

.project-card .status {
  display: inline-block;
  margin-top: 8px;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
}

.status-idle { background: var(--bg-elevated); color: var(--text-muted); }
.status-processing { background: #1a3a5c; color: var(--accent); }
.status-done { background: #1a3a2a; color: var(--success); }
.status-error { background: #3a1a1a; color: var(--error); }

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 100;
  align-items: center;
  justify-content: center;
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 460px;
}

.modal h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 8px 12px;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  margin-top: 16px;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  color: var(--text-muted);
  transition: border-color 0.15s, background 0.15s;
  cursor: pointer;
}

.drop-zone:hover,
.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(88, 166, 255, 0.05);
}

.drop-zone input[type="file"] {
  display: none;
}

/* Frame grid */
.frame-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.frame-card {
  position: relative;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.frame-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

.frame-card .frame-info {
  padding: 6px 8px;
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.frame-card .frame-delete {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.7);
  color: var(--error);
  border: none;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.15s;
}

.frame-card:hover .frame-delete {
  opacity: 1;
}

/* Library item selection */
.library-item {
  transition: border-color 0.15s, box-shadow 0.15s;
}

.library-item.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent);
}

/* Progress */
.progress-bar {
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 8px;
}

.progress-bar .fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s;
}

.progress-text {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
  font-family: "SF Mono", "Cascadia Code", "Fira Code", monospace;
}

/* Result view */
.result-section {
  margin-top: 20px;
}

.result-image {
  width: 100%;
  max-height: 600px;
  object-fit: contain;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* Config panel */
.config-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 640px) {
  .config-panel {
    grid-template-columns: 1fr;
  }
}

/* Section */
.section {
  margin-bottom: 24px;
}

.section h2 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}

.empty-state p {
  font-size: 15px;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.back-link:hover {
  color: var(--accent);
}