:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --ink: #1e2a36;
  --sub: #5f6f82;
  --line: #d9e2ee;
  --brand: #1f6feb;
  --warn: #b15d00;
  --error: #c0362c;
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.app {
  max-width: 1180px;
  margin: 24px auto;
  padding: 0 16px 30px;
}

.hero {
  background: linear-gradient(120deg, #0f3d86, #1f6feb);
  color: #fff;
  border-radius: var(--radius);
  padding: 18px;
}

.hero h1 { margin: 0 0 6px; font-size: 26px; }
.hero p { margin: 0; opacity: 0.92; }

.tabs {
  display: flex;
  gap: 10px;
  margin-top: 16px;
  flex-wrap: wrap;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  text-decoration: none;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.tab-btn.active {
  background: #fff;
  color: var(--brand);
}

.panel {
  margin-top: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
}

.tab-panel[hidden] { display: none; }

.file-line {
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: var(--sub);
}

.row {
  margin-top: 12px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tight-row { margin-top: 0; }

.btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 10px;
  padding: 9px 13px;
  font-weight: 700;
  cursor: pointer;
}

.btn.primary {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}

.status {
  margin: 10px 0 0;
  color: var(--sub);
}

.status.error { color: var(--error); }

.meta { color: var(--sub); margin-bottom: 10px; }
.warnings { color: var(--warn); margin-bottom: 8px; }
.helper { margin: 0 0 10px; color: var(--sub); line-height: 1.6; font-size: 13px; }

.table-wrap { overflow: auto; }

.preview-table,
.move-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.preview-table th,
.preview-table td,
.move-table th,
.move-table td {
  text-align: left;
  padding: 8px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.preview-table th,
.move-table th {
  color: var(--sub);
  background: #f8fafc;
}

.subtotal-row td {
  background: #f2f4f7;
  font-weight: 700;
}

.group-start td { border-top: 2px solid #8ea0b8; padding-top: 12px; }
.group-end td { border-bottom: 2px solid #8ea0b8; }

.optimizer-head,
.customs-topbar {
  display: flex;
  gap: 12px;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 14px 0 16px;
}

.metric-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #fbfdff;
}

.metric-card strong { display: block; margin-bottom: 8px; }
.metric-card p { margin: 0; color: var(--sub); line-height: 1.6; font-size: 12px; }

.comparison-wrap {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fbff;
  padding: 10px;
  margin-bottom: 10px;
}

.comparison-title {
  margin: 0 0 8px;
  font-size: 14px;
  color: var(--ink);
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
}

.comparison-card {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  padding: 8px 10px;
  font-size: 12px;
  line-height: 1.5;
}

.comparison-delta-up { color: #1c7a3a; font-weight: 700; }
.comparison-delta-down { color: #b72a2a; font-weight: 700; }

.split-tag {
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 999px;
  font-size: 11px;
  color: #0f5d96;
  background: #e8f3ff;
}

.allocation-hint {
  margin-top: 3px;
  color: var(--sub);
  font-size: 11px;
}

.subheading { margin: 16px 0 8px; font-size: 16px; }

.cap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.cap-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 12px;
  color: var(--sub);
}

.cap-field input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 8px;
  font: inherit;
}

.move-select,
.field input {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 8px 10px;
  font: inherit;
  background: #fff;
}

.move-select { min-width: 140px; }

.customs-meta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.field {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--sub);
  font-size: 13px;
}

.file-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--sub);
  font-size: 13px;
}

.customs-wrap {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: #f8fafc;
}

.sheet-paper {
  min-width: 1500px;
  background: #fff;
  border: 1px solid #111;
  padding: 10px;
}

.sheet-table {
  width: 100%;
  border-collapse: collapse;
  table-layout: fixed;
  font-size: 12px;
  color: #111;
  font-family: "SimSun", "Songti SC", serif;
}

.sheet-table th,
.sheet-table td {
  border: 1px solid #111;
  text-align: center;
  padding: 2px 3px;
  line-height: 1.2;
  word-break: break-all;
}

.sheet-title { font-size: 24px; padding: 10px 0; }
.sheet-side { font-weight: 700; }
.sheet-ref { margin-top: 4px; text-align: left; font-size: 10px; color: #666; line-height: 1.4; }
.sheet-warning { margin-top: 4px; text-align: left; font-size: 10px; color: var(--warn); line-height: 1.4; font-weight: 700; }
.sheet-empty-note { padding: 8px 10px; color: var(--sub); font-size: 12px; border-bottom: 1px solid var(--line); }
.sheet-cell-input { width: 100%; border: none; background: transparent; text-align: center; font: inherit; }
.sheet-value { display: block; min-height: 14px; }
.formula-red { color: #c63d2f; font-weight: 700; }
.formula-blue { color: #1f5aa6; font-weight: 700; }
.formula-warn { color: var(--warn); font-weight: 700; background: #fff3e6; }

@media print {
  .hero,
  .uploader-panel,
  #originalPanel,
  #adjustedPanel,
  .customs-topbar,
  .helper { display: none !important; }

  #customsPanel { display: block !important; }
  .sheet-paper { min-width: 0; border: none; padding: 0; }
  .customs-wrap, .panel { border: none; box-shadow: none; padding: 0; }
}