.methods-page {
  background: var(--bg);
}

.methods-header .back-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
}

.methods-layout {
  max-width: min(960px, var(--max-width));
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1.75rem;
  align-items: start;
}

.methods-layout,
.methods-main,
.methods-nav,
.methods-section,
.table-scroll {
  min-width: 0;
  max-width: 100%;
}

.methods-main {
  overflow-wrap: break-word;
}

.methods-nav {
  position: sticky;
  top: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.5rem 0;
}

.methods-nav a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: background 0.15s ease, color 0.15s ease;
}

.methods-nav a:hover {
  color: var(--accent-strong);
  background: var(--obs-slate-50);
}

.methods-nav a.active {
  color: var(--accent-strong);
  background: var(--accent-soft);
  border-left-color: var(--accent);
  font-weight: 600;
}

.methods-meta {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 0.85rem 1.1rem;
  background: linear-gradient(145deg, #ffffff 0%, var(--obs-blue-50) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  font-size: 0.88rem;
  color: var(--muted);
}

.methods-meta strong {
  color: var(--accent-strong);
}

.methods-meta-badge {
  display: inline-flex;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-strong);
}

.methods-section {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0;
  box-shadow: none;
  padding: 1.5rem 1.75rem;
  margin-bottom: 1.25rem;
  scroll-margin-top: 1rem;
  font-size: 1rem;
  line-height: 1.55;
}

.methods-section h2 {
  margin: 0 0 0.85rem;
  font-size: 1.2rem;
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--accent-strong);
}

.methods-section h3 {
  margin: 1.35rem 0 0.55rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.methods-section > p:first-of-type {
  margin-top: 0;
}

.methods-section .hint {
  margin-top: 0.65rem;
}

.table-scroll {
  overflow-x: auto;
  margin: 0.75rem 0 1rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--obs-slate-50);
}

.methods-main .period-table,
.methods-main .methods-data-table {
  font-size: 0.9rem;
  margin: 0;
  width: 100%;
  min-width: 28rem;
  table-layout: fixed;
  border-collapse: collapse;
  background: #fff;
}

.methods-main .period-table th,
.methods-main .period-table td,
.methods-main .methods-data-table th,
.methods-main .methods-data-table td {
  padding: 0.5rem 0.75rem;
  border: 1px solid #eeeeee;
  text-align: left;
  vertical-align: top;
  word-break: break-word;
}

.methods-main .period-table th,
.methods-main .methods-data-table th {
  background: var(--obs-blue-50);
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 0.82rem;
}

.methods-main .period-table .col-num,
.methods-main .methods-data-table .col-num {
  text-align: right;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.methods-main .period-table tbody tr:nth-child(even) td,
.methods-main .methods-data-table tbody tr:nth-child(even) td {
  background: #f8fafc;
}

.methods-main .period-table tbody tr:hover td,
.methods-main .methods-data-table tbody tr:hover td {
  background: rgba(219, 234, 254, 0.35);
}

.methods-formula-list {
  margin: 0.75rem 0 1rem;
  padding-left: 1.2rem;
  line-height: 1.55;
}

.methods-formula-list li {
  margin-bottom: 0.35rem;
}

.methods-conversion-chain {
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
  margin: 0.5rem 0 0.75rem;
}

.methods-h15-warning {
  margin: 0 0 1rem;
  padding: 0.9rem 1rem;
  background: #fff7ed;
  border: 1px solid #fdba74;
  border-left: 4px solid #ea580c;
  border-radius: 0;
}

.methods-h15-warning strong {
  display: block;
  margin-bottom: 0.35rem;
  color: #9a3412;
  font-size: 0.95rem;
}

.methods-h15-warning p {
  margin: 0;
  color: #7c2d12;
  line-height: 1.5;
}

.methods-comparator {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 0.75rem 1rem;
  margin: 1rem 0;
}

.methods-comparator-side {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  gap: 0.5rem;
  padding: 1.1rem 1.25rem;
  text-align: center;
  background: var(--surface);
  border: 1px solid #e0e0e0;
  border-radius: 0;
  min-height: 100%;
}

.methods-comparator-side-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  line-height: 1.35;
  max-width: 14rem;
}

.methods-comparator-side-value {
  font-size: 2rem;
  font-weight: 750;
  color: var(--accent);
  line-height: 1.1;
}

.methods-comparator-side-unit {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  margin-top: 0.15rem;
}

.methods-comparator-side-phrase {
  margin: 0.25rem 0 0;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--text);
  text-align: left;
  flex: 1;
}

.methods-comparator-vs {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  margin: auto;
  border-radius: 999px;
  background: var(--obs-slate-50);
  border: 1px solid var(--border);
  font-weight: 700;
  color: var(--muted);
}

.validation-ok {
  color: #1a7f4e;
  font-weight: 600;
}

.validation-fail {
  color: #b42318;
  font-weight: 600;
}

.validation-table .validation-cell-ok {
  color: inherit;
}

.validation-table .validation-cell-fail {
  color: #b42318;
  font-weight: 600;
}

.validation-table {
  min-width: 36rem;
}

.validation-table th:nth-child(1),
.validation-table td:nth-child(1) {
  width: 5.5rem;
}

.validation-table th:nth-child(2),
.validation-table td:nth-child(2) {
  width: 5.5rem;
}

.methods-main .methods-data-table th:first-child,
.methods-main .methods-data-table td:first-child {
  width: 28%;
}

.methods-main .methods-data-table th:last-child,
.methods-main .methods-data-table td:last-child {
  width: 22%;
}

.methods-h15-body {
  margin: 0 0 0.75rem;
  line-height: 1.55;
}

.oat-effect-pos {
  color: #1a7f4e;
  font-weight: 600;
}

.oat-effect-neg {
  color: #b42318;
  font-weight: 600;
}

.product-canvas {
  width: 100%;
  height: 220px;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.methods-main code {
  font-size: 0.85em;
  padding: 0.1rem 0.35rem;
  background: var(--obs-slate-50);
  border-radius: 4px;
}

@media (max-width: 860px) {
  .methods-layout {
    grid-template-columns: 1fr;
    padding: 1rem 1rem 2rem;
  }

  .methods-nav {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    padding: 0.5rem;
  }

  .methods-nav a {
    padding: 0.4rem 0.7rem;
    border-radius: 999px;
    border: 1px solid var(--border);
    border-left: 1px solid var(--border);
    font-size: 0.82rem;
  }

  .methods-nav a.active {
    border-color: var(--accent);
    background: var(--accent-soft);
  }

  .methods-comparator {
    grid-template-columns: 1fr;
  }

  .methods-comparator-vs {
    display: none;
  }
}