:root {
  --bg: #fafafa;
  --fg: #222;
  --accent: #0066cc;
  --error: #c00;
  --card-bg: #fff;
  --border: #ccc;
}
[data-theme="dark"] {
  --bg: #121212;
  --fg: #eee;
  --accent: #3399ff;
  --error: #ff6b6b;
  --card-bg: #1e1e1e;
  --border: #444;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.4;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
}

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

main {
  padding: 1rem;
  max-width: 1000px;
  margin: auto;
}

section {
  margin-bottom: 2rem;
  background: var(--card-bg);
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  background: var(--bg);
}

.drop-zone.dragover {
  border-color: var(--accent);
  background: rgba(0, 102, 204, 0.05);
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  margin: 0.2rem;
  font-size: 0.9rem;
}

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

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

label {
  font-size: 0.9rem;
}

input[type="number"],
input[type="range"],
select {
  margin-left: 0.3rem;
}

.error {
  color: var(--error);
  margin-top: 0.5rem;
}

#preview-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 200px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: auto;
}

#preview-canvas {
  max-width: 100%;
  max-height: 500px;
}

.preset-btn {
  font-size: 0.8rem;
}

.progress-container {
  margin-top: 1rem;
}

.hidden {
  display: none;
}

#batch-list {
  list-style: none;
  padding: 0;
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg);
}

#batch-list li {
  padding: 0.4rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

#batch-list li:last-child {
  border-bottom: none;
}

@media (max-width: 600px) {
  .row {
    flex-direction: column;
    align-items: stretch;
  }
}