:root {
  --ink: #1a1f2e;
  --muted: #5b6475;
  --line: #d9dee7;
  --bg: #f3f5f9;
  --card: #ffffff;
  --accent: #0b6e4f;
  --accent-soft: #e6f4ef;
  --danger: #b42318;
  --radius: 12px;
  --font: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.5;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; gap: .75rem; align-items: baseline; }
.brand strong { color: var(--accent); font-size: 1.1rem; }
.tagline { margin: 0; color: var(--muted); font-size: .9rem; }

.layout {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 1.25rem;
  padding: 1.25rem;
  align-items: start;
}

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 1.25rem;
  position: sticky;
  top: 1rem;
  max-height: calc(100vh - 2rem);
  overflow: auto;
}
.panel h2, .panel h3 { margin: 1rem 0 .5rem; font-size: 1rem; }
.panel h2 { margin-top: 0; }
.panel label {
  display: block;
  font-size: .82rem;
  color: var(--muted);
  margin-bottom: .7rem;
}
.panel input, .panel select, .panel textarea {
  display: block;
  width: 100%;
  margin-top: .25rem;
  padding: .55rem .65rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  color: var(--ink);
  background: #fff;
}
.item-row {
  display: grid;
  grid-template-columns: 1fr 64px 56px 84px 28px;
  gap: .35rem;
  margin-bottom: .45rem;
}
.item-row input { margin-top: 0; padding: .4rem .45rem; font-size: .85rem; }
.item-row button {
  border: none;
  background: transparent;
  color: var(--danger);
  cursor: pointer;
  font-size: 1.1rem;
}

.actions { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1rem; }
.btn {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: .55rem 1rem;
  font: inherit;
  cursor: pointer;
}
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.secondary:hover { background: var(--accent-soft); }
.hint { font-size: .78rem; color: var(--muted); margin: .8rem 0 0; }

.preview-wrap { overflow: auto; }
.sheet {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 2rem 2.2rem 1.5rem;
  max-width: 820px;
  margin: 0 auto;
  box-shadow: 0 8px 24px rgba(26, 31, 46, .06);
}
.sheet-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 1rem;
  margin-bottom: 1.25rem;
}
.doc-label { margin: 0; font-size: 1.8rem; font-weight: 700; letter-spacing: .08em; }
.doc-sub { margin: .2rem 0 0; color: var(--muted); font-size: .85rem; }
.meta p { margin: .15rem 0; font-size: .9rem; }
.meta span { display: inline-block; min-width: 4.5rem; color: var(--muted); }

.parties {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}
.buyer .name, .seller .name { font-size: 1.15rem; font-weight: 700; margin: 0 0 .35rem; }
.addr { margin: 0; white-space: pre-wrap; color: var(--muted); font-size: .9rem; }
.honor { margin: .8rem 0 0; }
.reg { margin: .4rem 0 0; font-size: .85rem; }

.total-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--accent-soft);
  border: 1px solid #b7dfd0;
  border-radius: 8px;
  padding: .85rem 1rem;
  margin-bottom: 1.25rem;
}
.total-banner strong { font-size: 1.6rem; color: var(--accent); }

.items-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .92rem;
  margin-bottom: 1.25rem;
}
.items-table th, .items-table td {
  border-bottom: 1px solid var(--line);
  padding: .55rem .4rem;
  text-align: left;
}
.items-table th { color: var(--muted); font-weight: 600; font-size: .8rem; }
.items-table td:nth-child(2),
.items-table td:nth-child(4),
.items-table td:nth-child(5),
.items-table th:nth-child(2),
.items-table th:nth-child(4),
.items-table th:nth-child(5) { text-align: right; }
.items-table td:nth-child(3),
.items-table th:nth-child(3) { text-align: center; }

.totals {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 1rem;
  align-items: start;
}
.bank {
  background: #f8fafc;
  border: 1px dashed var(--line);
  border-radius: 8px;
  padding: .75rem 1rem;
}
.bank h4, .notes-block h4 { margin: 0 0 .4rem; font-size: .85rem; color: var(--muted); }
.bank p, .notes-block p { margin: 0; white-space: pre-wrap; font-size: .9rem; }
.totals dl { margin: 0; }
.totals dl > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: .35rem 0;
  border-bottom: 1px solid var(--line);
}
.totals dt { color: var(--muted); }
.totals dd { margin: 0; font-variant-numeric: tabular-nums; }
.totals .grand { font-weight: 700; border-bottom: none; padding-top: .55rem; }

.notes-block { margin-top: 1.25rem; }
.sheet-foot {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .78rem;
}
.sheet-foot .url { margin: .2rem 0 0; word-break: break-all; }


.usage-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 0 auto 0.75rem;
  flex-wrap: wrap;
}
.usage-stat {
  min-width: 7rem;
  padding: 0.65rem 1.1rem;
  border: 1px solid var(--border, #d8e0e8);
  border-radius: 10px;
  background: #fff;
}
.usage-num {
  display: block;
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--accent, #0d7377);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}
.usage-label {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.78rem;
  color: var(--muted, #667);
}
.usage-note {
  font-size: 0.75rem;
  opacity: 0.9;
  margin: 0 0 1rem;
}

.site-foot {
  text-align: center;
  color: var(--muted);
  font-size: .85rem;
  padding: 1rem 1.5rem 2rem;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .panel { position: static; max-height: none; }
  .parties, .totals { grid-template-columns: 1fr; }
  .item-row { grid-template-columns: 1fr 1fr; }
}

@media print {
  body { background: #fff; }
  .no-print { display: none !important; }
  .layout { display: block; padding: 0; }
  .sheet {
    box-shadow: none;
    border: none;
    max-width: none;
    padding: 0;
  }
}

.site-foot a { color: var(--accent); text-decoration: none; }
.site-foot a:hover { text-decoration: underline; }


.toggle-brand {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin: .75rem 0 .25rem;
  font-size: .82rem;
  color: var(--muted);
}
.toggle-brand input {
  width: auto;
  margin: 0;
}
.brand-foot.is-hidden {
  display: none !important;
}

/* Shared calculator additions */
.calc-result { margin-top: 1rem; }
.calc-result h3 { margin: 0 0 .75rem; }
.result-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; }
.result-card { background: var(--accent-soft); border: 1px solid #b7dfd0; border-radius: 8px; padding: .8rem; }
.result-card span { display: block; color: var(--muted); font-size: .82rem; }
.result-card strong, .calc-result big { display: block; margin-top: .15rem; color: var(--accent); font-size: 1.45rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.calc-note { color: var(--muted); font-size: .82rem; }
.toggle-brand { display: flex; align-items: center; gap: .5rem; margin: .75rem 0 .25rem; font-size: .82rem; color: var(--muted); }
.toggle-brand input { width: auto; margin: 0; }
.brand-foot.is-hidden { display: none !important; }
.line-editor { display: grid; grid-template-columns: 1fr 120px 30px; gap: .4rem; align-items: center; margin-bottom: .4rem; }
.line-editor input { margin-top: 0; }
.line-editor button { border: 0; background: transparent; color: var(--danger); cursor: pointer; font-size: 1.1rem; }
.rate-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .5rem; }
.rate-grid label { margin-bottom: .25rem; }
.status { margin: .6rem 0 0; font-size: .82rem; color: var(--muted); }
.status.ok { color: var(--accent); }
.status.error { color: var(--danger); }
@media (max-width: 640px) { .result-grid { grid-template-columns: 1fr; } .line-editor { grid-template-columns: 1fr 100px 30px; } }
@media print { .calc-result { break-inside: avoid; } }