:root {
  --bg: #12141a;
  --panel: #1b1e27;
  --border: #2c3140;
  --text: #e6e8ee;
  --muted: #9aa1b2;
  --accent: #5b8cff;
  --danger: #ff5b6a;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}
header { padding: 20px 24px 0; }
h1 { margin: 0 0 4px; font-size: 22px; }
.sub { margin: 0; color: var(--muted); font-size: 13px; }
main {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 16px;
  padding: 16px 24px 32px;
  max-width: 1200px;
}
section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
}
#history-panel { grid-column: 1 / -1; }
h2 { font-size: 15px; margin: 0 0 12px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 4px; }
textarea, input[type="text"], select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  padding: 8px;
  font: inherit;
}
.row { display: flex; gap: 10px; align-items: flex-end; margin-top: 14px; }
.row > div { flex: 1; }
button, .button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 9px 18px;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}
button:disabled { opacity: 0.45; cursor: not-allowed; }
.hint { font-size: 12px; color: var(--muted); margin-top: 4px; }
.status { font-size: 13px; margin-top: 10px; min-height: 18px; }
.status.busy { color: var(--accent); }
.status.error { color: var(--danger); }
#result-img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); }
.meta { font-size: 12px; color: var(--muted); margin: 8px 0; word-break: break-all; }
.empty { color: var(--muted); font-size: 13px; }
.history { display: flex; flex-wrap: wrap; gap: 10px; }
.history .thumb {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px;
  cursor: pointer;
  background: var(--bg);
}
.history .thumb.active { outline: 2px solid var(--accent); }
.history img { width: 96px; height: 96px; object-fit: cover; display: block; }
#toast {
  position: fixed;
  top: 16px;
  right: 16px;
  background: var(--danger);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  max-width: 420px;
  font-size: 13px;
}