:root {
  --bg: #f5f6f8;
  --panel: #ffffff;
  --text: #1c1e21;
  --muted: #6b7280;
  --border: #e3e5e8;
  --accent: #2563eb;        /* 白字对比度 5.2:1，两种主题都够 WCAG AA */
  --accent-text: #ffffff;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --ok: #15803d;
  --ok-bg: #ecfdf5;
  --radius: 10px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --panel: #181b21;
    --text: #e5e7eb;
    --muted: #9aa3b2;
    --border: #2a2f3a;
    --accent: #2563eb;
    --danger: #f87171;
    --danger-bg: #2a1515;
    --ok: #4ade80;
    --ok-bg: #122117;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  background: var(--bg);
  color: var(--text);
}
.topbar {
  display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 12px;
  padding: 12px 20px; border-bottom: 1px solid var(--border); background: var(--panel);
  position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 600; font-size: 17px; white-space: nowrap; }
.brand .muted { font-weight: 400; font-size: 14px; margin-left: 6px; display: inline-block; }
.badge { font-size: 13px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--border); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
.badge.ok { color: var(--ok); background: var(--ok-bg); border-color: transparent; }
.badge.bad { color: var(--danger); background: var(--danger-bg); border-color: transparent; }
.nowrap { white-space: nowrap; flex: none; }
.topbar-right { display: flex; align-items: center; gap: 8px; min-width: 0; flex-wrap: wrap; }
.table-wrap { overflow: auto; margin-bottom: 12px; }
table { border-collapse: collapse; font-size: 13px; width: 100%; }
th, td { padding: 4px 8px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; }
th { color: var(--muted); font-weight: 500; }
.hist-user { color: var(--accent); font-weight: 600; }
.layout { display: grid; grid-template-columns: minmax(360px, 480px) 1fr; gap: 20px; padding: 20px; max-width: 1500px; margin: 0 auto; }
@media (max-width: 900px) { .layout { grid-template-columns: 1fr; padding: 12px; gap: 12px; } }
@media (max-width: 600px) { .topbar { padding: 10px 12px; } .brand .muted { display: none; } }
.panel { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; min-width: 0; }
h2 { font-size: 16px; margin: 16px 0 10px; display: flex; align-items: center; gap: 10px; }
h2:first-child { margin-top: 0; }
.tabs { display: flex; gap: 6px; margin-bottom: 12px; }
.tab { flex: 1; padding: 8px; border: 1px solid var(--border); background: transparent; color: var(--text); border-radius: 8px; cursor: pointer; font-size: 15px; }
.tab.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.field, .options label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; color: var(--muted); margin-bottom: 10px; }
textarea, input[type=text], input[type=number], select {
  font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 8px; width: 100%;
}
textarea { resize: vertical; min-height: 90px; }
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 0 12px; margin-top: 8px; }
.options label.check { flex-direction: row; flex-wrap: wrap; align-items: center; gap: 6px; grid-column: 1 / -1; color: var(--text); font-size: 14px; }
.options label.check input { width: auto; }
.options label.wide { grid-column: 1 / -1; }
input[type=range] { width: 100%; }
button { font: inherit; cursor: pointer; border-radius: 8px; border: 1px solid var(--border); background: var(--panel); color: var(--text); padding: 6px 12px; }
button:hover { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); padding: 10px 22px; font-size: 16px; font-weight: 600; }
button.ghost { background: transparent; }
button.small { padding: 2px 8px; font-size: 12px; }
button.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.actions { display: flex; gap: 10px; align-items: center; margin-top: 6px; }
.progress { margin-top: 10px; padding: 8px 10px; border-radius: 8px; background: var(--bg); font-size: 14px; }
.error { margin-top: 10px; padding: 10px 12px; border-radius: 8px; background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger); font-size: 14px; }
.error .muted { color: var(--danger); opacity: .8; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.dropzone {
  border: 2px dashed var(--border); border-radius: var(--radius); padding: 18px; text-align: center;
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; align-items: center; cursor: pointer; margin-bottom: 10px;
}
.dropzone.drag { border-color: var(--accent); background: rgba(37, 99, 235, .08); }
.thumbs { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 10px; margin-bottom: 10px; }
.thumb { border: 1px solid var(--border); border-radius: 8px; overflow: hidden; font-size: 12px; background: var(--bg); }
.thumb.primary { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.thumb img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
.thumb-meta { padding: 6px 8px 0; display: flex; flex-direction: column; }
.thumb-name { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.thumb-actions { display: flex; gap: 4px; padding: 6px 8px 8px; }
.thumb-actions button { padding: 2px 6px; font-size: 12px; }
details { border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; margin-bottom: 10px; }
summary { cursor: pointer; font-size: 14px; }
.mask-tools { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin: 10px 0; font-size: 13px; }
.mask-tools label { display: flex; align-items: center; gap: 6px; }
.mask-tools input[type=range] { width: 140px; }
.mask-wrap { background: repeating-conic-gradient(var(--border) 0 25%, transparent 0 50%) 0 0 / 16px 16px; border-radius: 8px; overflow: hidden; }
#mask-canvas { width: 100%; height: auto; display: block; touch-action: none; cursor: crosshair; }
.partials { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.partials img { max-width: 220px; max-height: 220px; border-radius: 8px; border: 1px dashed var(--border); opacity: .85; }
.results { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.card { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--bg); }
.card img { width: 100%; display: block; cursor: zoom-in; }
.card-bar { display: flex; gap: 8px; padding: 8px 10px; align-items: center; font-size: 13px; flex-wrap: wrap; }
.card-bar a { color: var(--accent); text-decoration: none; }
.usage { margin: 10px 0; font-size: 13px; }
.history { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.hist { border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--bg); display: flex; flex-direction: column; }
.hist img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; cursor: zoom-in; }
.hist-meta { padding: 8px 10px; font-size: 12px; display: flex; flex-direction: column; gap: 4px; }
.hist-prompt { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 13px; color: var(--text); }
.hist-actions { display: flex; gap: 6px; margin-top: 4px; }
.hist-actions button { padding: 2px 8px; font-size: 12px; }
.lightbox {
  position: fixed; inset: 0; background: rgba(0, 0, 0, .85); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 12px; z-index: 50; padding: 20px; outline: none;
}
.lightbox img { max-width: 95vw; max-height: 85vh; border-radius: 8px; background: #111; }
.lightbox-bar { display: flex; gap: 10px; }
.lightbox-bar a, .lightbox-bar button {
  color: #fff; background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .3);
  padding: 6px 14px; border-radius: 8px; text-decoration: none; font: inherit; cursor: pointer;
}
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 8px 16px; border-radius: 999px; font-size: 14px; z-index: 60; box-shadow: 0 4px 16px rgba(0, 0, 0, .25);
  max-width: 90vw;
}
[hidden] { display: none !important; }