:root {
  --bg: #f6f8fb;
  --card: #ffffff;
  --border: #e6e9ef;
  --text: #1f2937;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-soft: #eff4ff;
  --bad: #dc2626;
  --shadow: 0 1px 3px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.05);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}

/* 顶部栏 */
.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 24px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 18px; margin: 0; font-weight: 600; }
.back { color: var(--muted); text-decoration: none; font-size: 14px; white-space: nowrap; }
.back:hover { color: var(--accent); }

/* 布局：左预览 / 右参数 / 底部整行列表 */
.layout {
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 24px 64px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 20px;
  align-items: start;
}
.stage-pane { min-width: 0; display: flex; flex-direction: column; gap: 20px; }
.panel { display: flex; flex-direction: column; gap: 16px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px 20px 20px;
  box-shadow: var(--shadow);
}
.card h2 { margin: 0 0 10px; font-size: 14px; letter-spacing: .2px; }
.card h2 + .hint { margin-top: -6px; }

.hint { color: var(--muted); font-size: 12.5px; margin: 0 0 12px; }
.meta { color: var(--muted); font-size: 12.5px; }
.stat {
  margin-top: 12px;
  padding: 8px 10px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: #1d4ed8;
  font-size: 12.5px;
  line-height: 1.5;
}
.stat.warn { background: #fef2f2; color: var(--bad); }

/* 预览区 */
.stage-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.sh-left { display: flex; align-items: center; gap: 12px; }
.sh-right { display: flex; align-items: center; gap: 10px; }

.pager {
  display: flex;
  align-items: center;
  gap: 4px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 2px 4px;
  font-size: 12.5px;
  color: var(--muted);
}
.pg-btn {
  border: 0;
  background: transparent;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 2px 6px;
  color: var(--muted);
  border-radius: 6px;
}
.pg-btn:hover { background: var(--accent-soft); color: var(--accent); }

.stage {
  position: relative;
  height: clamp(300px, 54vh, 600px);
  display: grid;
  place-items: center;
  padding: 18px;
  border-radius: 14px;
  background:
    linear-gradient(45deg, #eef1f6 25%, transparent 25%) 0 0/16px 16px,
    linear-gradient(-45deg, #eef1f6 25%, transparent 25%) 0 8px/16px 16px,
    linear-gradient(45deg, transparent 75%, #eef1f6 75%) 8px -8px/16px 16px,
    linear-gradient(-45deg, transparent 75%, #eef1f6 75%) -8px 0/16px 16px,
    #f7f9fc;
  border: 1px solid var(--border);
  overflow: hidden;
}
.sheet {
  position: relative;
  line-height: 0;
  box-shadow: 0 2px 6px rgba(16,24,40,.10), 0 14px 36px rgba(16,24,40,.14);
  background: #fff;
}
.sheet canvas { display: block; width: 100%; height: 100%; }
.cells { position: absolute; inset: 0; }

.cell { position: absolute; cursor: pointer; touch-action: none; }
.cell.has-photo { cursor: grab; }
.cell.has-photo:active { cursor: grabbing; }
.cell.dragging { cursor: grabbing; }
.cell:hover { box-shadow: inset 0 0 0 2px rgba(37,99,235,.55); }
.cell.sel { box-shadow: inset 0 0 0 2px var(--accent); }
.cell-idx {
  position: absolute;
  left: 4px;
  top: 4px;
  min-width: 18px;
  height: 18px;
  padding: 0 4px;
  border-radius: 6px;
  background: rgba(15,23,42,.62);
  color: #fff;
  font-size: 11px;
  line-height: 18px;
  text-align: center;
  opacity: 0;
  transition: opacity .15s ease;
  pointer-events: none;
}
.cell:hover .cell-idx, .cell.sel .cell-idx { opacity: 1; }

.empty-tip {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  pointer-events: none;
}
.empty-tip strong { font-size: 15px; color: #334155; font-weight: 600; }

.drop-hint {
  position: absolute;
  inset: 10px;
  border: 2px dashed var(--accent);
  border-radius: 12px;
  background: rgba(239,244,255,.86);
  display: none;
  place-items: center;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
}
.stage.dropping .drop-hint { display: grid; }

.stage-foot {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12.5px;
}

/* 按钮 */
.btn {
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-size: 13.5px;
  font-family: inherit;
  padding: 9px 14px;
  cursor: pointer;
  transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-sm { padding: 7px 12px; font-size: 13px; }
.btn-block { display: block; width: 100%; margin-top: 8px; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 500; }
.btn-primary:hover { background: #1d4ed8; border-color: #1d4ed8; color: #fff; }
.btn-outline { background: #fff; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--muted); }
.btn-ghost:hover { background: var(--accent-soft); color: var(--accent); }

/* 表单行 */
.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 34px;
  margin-bottom: 8px;
  font-size: 13px;
}
.row > span:first-child { color: var(--muted); white-space: nowrap; }
.row select, .row input[type="number"] {
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  max-width: 190px;
}
.row input[type="number"] { width: 68px; text-align: center; }
.row select { cursor: pointer; }
.row input[type="number"]:focus, .row select:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.row input[type="color"] {
  width: 46px;
  height: 28px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
}
.inline { display: flex; align-items: center; gap: 6px; }
.inline.grow { flex: 1; justify-content: flex-end; }
.inline.grow b { min-width: 44px; text-align: right; color: var(--text); font-weight: 600; font-size: 12.5px; }

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 120px;
  height: 22px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track { height: 4px; border-radius: 3px; background: #e2e8f0; }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  margin-top: -5px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #fff;
  box-shadow: 0 1px 3px rgba(16,24,40,.3);
}
input[type="range"]::-moz-range-track { height: 4px; border-radius: 3px; background: #e2e8f0; }
input[type="range"]::-moz-range-thumb { width: 12px; height: 12px; border: 2px solid #fff; border-radius: 50%; background: var(--accent); }

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  margin: 8px 0 0;
  cursor: pointer;
  user-select: none;
}
.check input { accent-color: var(--accent); width: 15px; height: 15px; }

/* 快速模板 */
.preset-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.preset {
  text-align: left;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 10px;
  padding: 8px 10px;
  cursor: pointer;
  font-family: inherit;
  transition: border-color .15s ease, background .15s ease;
}
.preset:hover { border-color: var(--accent); background: var(--accent-soft); }
.preset b { display: block; font-size: 13px; font-weight: 600; color: var(--text); }
.preset em { font-style: normal; font-size: 11.5px; color: var(--muted); }

/* 照片列表 */
.strip-head { display: flex; align-items: baseline; gap: 10px; }
.strip { display: flex; gap: 12px; overflow-x: auto; padding: 4px 2px 10px; }
.ph {
  position: relative;
  flex: 0 0 auto;
  width: 154px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 8px;
  background: #fff;
  display: flex;
  gap: 8px;
  align-items: center;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.ph.sel { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.ph.over { border-color: var(--accent); border-style: dashed; }
.ph.dragging { opacity: .45; }
.ph-thumb {
  width: 52px; height: 52px;
  border-radius: 8px;
  overflow: hidden;
  background: #f1f5f9;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
}
.ph-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; -webkit-user-drag: none; user-select: none; }
.ph-main { min-width: 0; flex: 1; }
.ph-name {
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--text);
}
.ph-dim { font-size: 11px; color: var(--muted); }
.ph-acts { position: absolute; right: 6px; bottom: 5px; display: flex; gap: 2px; }
.ic {
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  line-height: 1;
  padding: 3px 5px;
  border-radius: 6px;
  cursor: pointer;
  font-family: inherit;
}
.ic:hover { background: var(--accent-soft); color: var(--accent); }
.ic.danger:hover { background: #fef2f2; color: var(--bad); }
.ph-order {
  position: absolute;
  left: 4px; top: 4px;
  min-width: 17px; height: 17px;
  border-radius: 6px;
  background: rgba(15,23,42,.6);
  color: #fff;
  font-size: 10.5px;
  line-height: 17px;
  text-align: center;
  padding: 0 3px;
}
.strip-empty { color: var(--muted); font-size: 13px; padding: 6px 2px 10px; }

/* 打印：只输出当前页图片，页面尺寸按纸张实际 mm */
.print-root { display: none; }
@media print {
  html, body { background: #fff; margin: 0; padding: 0; }
  body > *:not(.print-root) { display: none !important; }
  .print-root { display: block; }
  .print-root img { display: block; width: 100%; height: auto; }
  @page { margin: 0; }
}

/* 窄屏 */
@media (max-width: 980px) {
  .layout { grid-template-columns: 1fr; padding: 18px 14px 48px; }
  .panel { order: 2; }
  .stage { height: clamp(260px, 44vh, 460px); padding: 12px; }
  .preset-row { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); }
}