:root {
  --bg: #f6f7fb;
  --surface: #fff;
  --surface-2: #f0f2f8;
  --text: #1b1f2a;
  --muted: #6b7280;
  --border: #e3e6ef;
  --accent: #4f46e5;
  --accent-weak: #eef0ff;
  --danger: #dc2626;
  --ok: #059669;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(20, 24, 40, .06);
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1117;
    --surface: #171a23;
    --surface-2: #1f2430;
    --text: #e8eaf0;
    --muted: #9aa3b2;
    --border: #2a3040;
    --accent: #8b8dff;
    --accent-weak: #23263a;
    --shadow: 0 10px 30px rgba(0, 0, 0, .35);
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.6 system-ui, -apple-system, "Segoe UI", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  padding: 24px 20px 60px;
}
header { max-width: 1180px; margin: 0 auto 18px; }
.backlink { display: inline-block; margin-bottom: 8px; font-size: 12px; color: var(--muted); text-decoration: none; }
.backlink:hover { color: var(--accent); }
h1 { font-size: 22px; margin: 0 0 6px; letter-spacing: .2px; }
header p { margin: 0; color: var(--muted); font-size: 13.5px; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.badges span {
  font-size: 12px; padding: 2px 9px; border-radius: 999px;
  background: var(--accent-weak); color: var(--accent); border: 1px solid var(--border);
}
main { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) 380px; gap: 18px; align-items: start; }
@media (max-width: 940px) { main { grid-template-columns: minmax(0, 1fr); } }

.stage {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 14px; display: flex; flex-direction: column; gap: 12px; min-height: 420px;
}
.dropzone {
  flex: 1; display: grid; place-items: center; min-height: 320px;
  border: 2px dashed var(--border); border-radius: 12px; background: var(--surface-2);
  color: var(--muted); text-align: center; cursor: pointer; transition: border-color .15s, background .15s;
}
.dropzone:hover, .dropzone.drag { border-color: var(--accent); background: var(--accent-weak); color: var(--text); }
.dropzone p { margin: 4px 0; }
.dropzone .hint { font-size: 12px; opacity: .85; }
#display { max-width: 100%; max-height: 68vh; border-radius: 10px; display: block; margin: 0 auto; image-rendering: pixelated; }
.stage-bar { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.spacer { flex: 1; }

button, select, input, textarea {
  font: inherit; color: inherit;
}
button {
  appearance: none; border: 1px solid var(--border); background: var(--surface-2);
  padding: 7px 14px; border-radius: 10px; cursor: pointer; transition: .15s;
}
button:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover:not(:disabled) { filter: brightness(1.08); color: #fff; }
button:disabled { opacity: .45; cursor: not-allowed; }
input[type="number"] { width: 72px; padding: 5px 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
#custom-shift { width: 120px; }
#custom-shift-box { margin: 8px 0 0; }
select { padding: 6px 8px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
textarea {
  width: 100%; resize: vertical; padding: 9px 10px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--surface-2); font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px; letter-spacing: .3px;
}
label { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--muted); }
label.mini { flex: 0 0 auto; }
label.qa { gap: 4px; }

.panel { display: flex; flex-direction: column; gap: 14px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 14px;
}
.card h2 { font-size: 14px; margin: 0 0 10px; letter-spacing: .3px; }
.card .row { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; align-items: center; }
.note { font-size: 12px; color: var(--muted); margin: 8px 0 0; }
.note.error { color: var(--danger); }
.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 12px; margin: 10px 0 0; font-size: 13px; }
.stats > div { display: flex; justify-content: space-between; gap: 8px; border-bottom: 1px dashed var(--border); padding-bottom: 3px; }
.stats dt { color: var(--muted); margin: 0; }
.stats dd { margin: 0; font-variant-numeric: tabular-nums; }
.stats > div { white-space: nowrap; }
.stats > div.wide { grid-column: 1 / -1; }
.stats > div.wide dd { white-space: normal; }
.stats dd.mono, .mono { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 12px; word-break: break-all; text-align: right; }
.stat-ok { color: var(--ok); }
.stat-bad { color: var(--danger); }

.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
  max-width: min(680px, calc(100vw - 40px));
  background: var(--surface); border: 1px solid var(--danger); color: var(--text);
  border-radius: 12px; padding: 10px 16px; box-shadow: var(--shadow); z-index: 20; font-size: 13px;
}
.toast.ok { border-color: var(--ok); }

/* ---------- v1.1 说明性内容 ---------- */
.head-main { display: flex; gap: 18px; align-items: flex-start; justify-content: space-between; flex-wrap: wrap; }
.lede { max-width: 62ch; }
.lede strong { color: var(--text); }
.badges { margin-top: 4px; }
.stage-head { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.chip {
  font-size: 12px; padding: 2px 10px; border-radius: 999px;
  background: var(--accent-weak); color: var(--accent); border: 1px solid var(--border);
}
.chip.muted { background: transparent; color: var(--muted); }
.dz-title { font-size: 15px; color: var(--text); }
.steps { margin: 0; padding-left: 20px; font-size: 13px; color: var(--muted); }
.steps li { margin: 6px 0; }
.steps b { color: var(--text); font-weight: 600; margin-right: 4px; }
.steps em, .details-body em { font-style: normal; color: var(--ok); }
kbd {
  font: inherit; font-size: 12px; padding: 1px 5px; border-radius: 5px;
  border: 1px solid var(--border); background: var(--surface-2);
}
details.card summary {
  cursor: pointer; font-size: 14px; font-weight: 600; list-style: none;
  display: flex; align-items: center; gap: 6px;
}
details.card summary::-webkit-details-marker { display: none; }
details.card summary::before { content: "▸"; color: var(--muted); transition: transform .15s; }
details.card[open] summary::before { transform: rotate(90deg); }
.details-body { font-size: 13px; color: var(--muted); }
.details-body p { margin: 10px 0 0; }
.details-body b { color: var(--text); }
.details-body code, footer code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px; padding: 1px 5px; border-radius: 5px;
  background: var(--surface-2); border: 1px solid var(--border);
}
footer {
  max-width: 1180px; margin: 26px auto 0; padding-top: 14px;
  border-top: 1px solid var(--border); color: var(--muted); font-size: 12px;
}