:root {
  --font-body: 'Aptos', 'Segoe UI', 'Trebuchet MS', sans-serif;
  --font-heading: 'Bahnschrift', 'Aptos Display', 'Segoe UI', sans-serif;
  --font-mono: 'Cascadia Mono', 'Consolas', monospace;

  --bg: #eef3f9;
  --bg-strong: #dce8f5;
  --surface: rgba(255, 255, 255, 0.82);
  --surface-elevated: #ffffff;
  --surface-soft: rgba(255, 255, 255, 0.62);
  --surface-panel: rgba(255, 255, 255, 0.78);
  --surface-note: rgba(248, 250, 252, 0.84);
  --border: rgba(15, 35, 62, 0.08);
  --border-strong: rgba(15, 35, 62, 0.16);
  --text: #11233d;
  --muted: #5b6f8d;
  --accent: #0ea5e9;
  --accent-strong: #0369a1;
  --accent-warm: #f97316;
  --accent-soft: rgba(14, 165, 233, 0.12);
  --success: #14b8a6;
  --math-font: 'Cambria Math', 'STIX Two Math', 'Times New Roman', serif;
  --shadow-lg: 0 30px 80px rgba(15, 35, 62, 0.14);
  --shadow-md: 0 18px 48px rgba(15, 35, 62, 0.1);
  --shadow-sm: 0 10px 30px rgba(15, 35, 62, 0.08);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --content-width: 1200px;
}

html {
  box-sizing: border-box;
  scroll-behavior: smooth;
}

*, *::before, *::after {
  box-sizing: inherit;
}

html.ui-preinit *,
html.ui-preinit *::before,
html.ui-preinit *::after {
  transition: none !important;
  animation: none !important;
}

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.16), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(249, 115, 22, 0.14), transparent 22%),
    linear-gradient(180deg, #f6f9fd 0%, var(--bg) 55%, #f6f8fc 100%);
  line-height: 1.65;
  min-height: 100vh;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.6) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.6) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.22;
  pointer-events: none;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 0.16em;
}

p {
  margin: 0;
}

h1, h2, h3, h4 {
  margin: 0;
  font-family: var(--font-heading);
  line-height: 1.1;
  letter-spacing: 0;
}

code {
  font-family: var(--font-mono);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  background: var(--surface-elevated);
  color: var(--text);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 2000;
}

.skip-link:focus {
  top: 12px;
}

.page-shell {
  width: min(calc(100% - 32px), var(--content-width));
  min-height: 100vh;
  margin: 0 auto;
  display: flex;
  flex: 1;
  flex-direction: column;
}

body:not(.page-ready) .page-shell {
  opacity: 0;
}

body.page-handoff .page-shell {
  will-change: opacity;
}

body.page-ready .page-shell {
  opacity: 1;
  transition: opacity 420ms ease;
}

.section-eyebrow,
.hero-meta__label,
.chapter-pager__label,
.chapter-card__step,
.eyebrow {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.76rem;
  font-weight: 600;
}

.chapter-card__stage {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.page-shell {
  padding: 2rem 0 2.5rem;
}

.page-shell > #controls-root {
  display: contents;
}

.atlas-timeline {
  position: sticky;
  top: 0.7rem;
  z-index: 80;
  margin-bottom: 1rem;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(18px);
}

.atlas-timeline__toggle {
  display: none;
}

.atlas-timeline__list {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.atlas-timeline__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 0.42rem;
  min-height: 2.45rem;
  padding: 0.35rem 0.48rem;
  border: 1px solid transparent;
  border-radius: 999px;
  color: var(--text);
  text-decoration: none;
  opacity: 0.72;
  transition: background 160ms ease, border-color 160ms ease, opacity 160ms ease, transform 160ms ease;
}

.atlas-timeline__step.is-dimmed {
  opacity: 0.42;
}

.atlas-timeline__step.is-prev,
.atlas-timeline__step.is-next {
  opacity: 0.92;
  background: rgba(246, 249, 253, 0.82);
  border-color: rgba(91, 111, 141, 0.16);
}

.atlas-timeline__step.is-next {
  color: var(--accent-strong);
  background: rgba(14, 165, 233, 0.1);
  border-color: rgba(14, 165, 233, 0.22);
}

.atlas-timeline__step.is-active {
  opacity: 1;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  border-color: rgba(3, 105, 161, 0.25);
  box-shadow: 0 12px 26px rgba(14, 165, 233, 0.22);
}

.atlas-timeline__step:hover,
.atlas-timeline__step:focus-visible {
  opacity: 1;
  transform: translateY(-1px);
}

.atlas-timeline__number {
  display: grid;
  width: 1.45rem;
  height: 1.45rem;
  place-items: center;
  border-radius: 999px;
  background: rgba(91, 111, 141, 0.12);
  font-size: 0.72rem;
  font-weight: 900;
}

.atlas-timeline__step.is-active .atlas-timeline__number {
  background: rgba(255, 255, 255, 0.22);
}

.atlas-timeline__label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.78rem;
  font-weight: 850;
}

.method-page-shell > .atlas-timeline {
  margin-bottom: 0.7rem;
  padding: 0.42rem;
}

.method-page-shell .atlas-timeline__list {
  gap: 0.18rem;
}

.method-page-shell .atlas-timeline__step {
  min-height: 2.08rem;
  gap: 0.32rem;
  padding: 0.24rem 0.38rem;
}

.method-page-shell .atlas-timeline__number {
  width: 1.22rem;
  height: 1.22rem;
  font-size: 0.66rem;
}

.method-page-shell .atlas-timeline__label {
  font-size: 0.72rem;
}

.hero,
.section-card,
.control-rail,
.chapter-pager__card,
.chapter-card,
.chart-panel,
.metric-card,
.resource-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-md);
}

.hero,
.section-card,
.resource-card {
  border-radius: var(--radius-xl);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: 1.5rem;
  padding: 2rem;
  margin-bottom: 1.4rem;
}

.hero::after,
.section-card::after,
.control-rail::after {
  content: '';
  position: absolute;
  inset: auto -20% -50% auto;
  width: 220px;
  height: 220px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(14, 165, 233, 0.16), transparent 70%);
  pointer-events: none;
}

.hero__content {
  display: grid;
  gap: 1rem;
  align-content: start;
  min-width: 0;
}

.hero__content h1 {
  font-size: 4rem;
  overflow-wrap: anywhere;
}

.hero__lede {
  font-size: 1.13rem;
  max-width: 64ch;
  color: var(--muted);
}

.hero__actions,
.lab-actions,
.chip-row,
.bullet-list,
.resource-list,
.equation-stack,
.insight-grid,
.stat-grid,
.roadmap {
  display: flex;
  gap: 0.9rem;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.9rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  color: white;
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  box-shadow: 0 16px 34px rgba(3, 105, 161, 0.22);
}

.button--secondary {
  color: var(--text);
  background: white;
  border-color: var(--border-strong);
}

.hero-meta {
  display: grid;
  gap: 1rem;
  padding: 1.2rem;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.62));
  border: 1px solid rgba(15, 35, 62, 0.08);
}

.hero-meta__stat {
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(14, 165, 233, 0.06);
}

.hero-meta__value {
  display: block;
  margin-top: 0.3rem;
  font-size: 1.4rem;
  font-family: var(--font-heading);
}

.section-card {
  padding: 1.65rem;
  margin-bottom: 1.4rem;
}

.section-card__header,
.metric-card__header {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.section-card__header h2,
.section-card__header h3 {
  font-size: clamp(1.35rem, 2vw, 2rem);
}

.section-card__body {
  display: grid;
  gap: 1rem;
}

.section-card__body > * + * {
  margin-top: 0;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  background: white;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}

.method-link-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.method-link-list a {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0.5rem 0.74rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.method-link-list a:hover {
  transform: translateY(-1px);
  border-color: rgba(3, 105, 161, 0.24);
  box-shadow: var(--shadow-sm);
}

.method-link-list__index {
  display: inline-grid;
  place-items: center;
  width: 1.45rem;
  height: 1.45rem;
  border-radius: 999px;
  background: rgba(14, 165, 233, 0.11);
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 900;
}

.method-link-list a.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-color: rgba(14, 165, 233, 0.28);
}

.method-link-list--hero {
  margin-top: 0.2rem;
}

.method-link-list--section {
  padding: 0.75rem;
  border-radius: var(--radius-lg);
  background: rgba(246, 249, 253, 0.72);
  border: 1px solid var(--border);
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.insight-card,
.roadmap-step,
.resource-card {
  padding: 1.1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
}

.insight-card strong,
.roadmap-step strong {
  display: block;
  margin-bottom: 0.4rem;
  font-family: var(--font-heading);
}

.equation-panel {
  padding: 1rem 1.2rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.equation-panel--accent {
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.08), rgba(255, 255, 255, 0.74));
}

.guide-block,
.takeaway-block,
.next-step {
  display: grid;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.guide-block__summary,
.next-step p {
  color: var(--text);
}

.guide-block__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.guide-block__item {
  display: grid;
  gap: 0.25rem;
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-md);
  background: rgba(14, 165, 233, 0.05);
  border: 1px solid rgba(14, 165, 233, 0.08);
}

.guide-block__label,
.next-step__label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.74rem;
  font-weight: 600;
}

.guide-block__focus {
  color: var(--muted);
}

.next-step {
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.08), rgba(255, 255, 255, 0.74));
}

.next-step--standalone .bullet-list {
  display: grid;
  gap: 0.75rem;
}

.takeaway-block .bullet-list,
.next-step .bullet-list {
  display: grid;
  gap: 0.75rem;
}

.callout {
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--accent);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(14, 165, 233, 0.08);
}

.control-rail {
  position: sticky;
  top: 0;
  z-index: 40;
  border-radius: var(--radius-xl);
  margin-bottom: 1.4rem;
}

.control-rail__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem 0.55rem;
}

.control-rail__header h2 {
  font-size: clamp(1.05rem, 1.5vw, 1.45rem);
}

.control-rail__toggle {
  border: 1px solid var(--border-strong);
  background: white;
  color: var(--text);
  border-radius: 999px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
}

.control-rail__body {
  padding: 0 1.1rem 1.1rem;
}

.control-rail__body:not(.is-open) {
  display: none;
}

.control-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.8rem;
  align-items: start;
}

.control-card {
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0.45rem;
  align-content: stretch;
  min-height: 122px;
  padding: 0.85rem 0.9rem;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--border);
}

.control-card--action {
  display: grid;
  grid-template-rows: 1fr;
  align-items: stretch;
  min-height: 122px;
}

.control-card--action .button {
  width: 100%;
  min-height: 46px;
  padding: 0.75rem 0.95rem;
  border-radius: 14px;
  align-self: center;
}

.control-card__topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  min-height: 24px;
}

.control-card__label {
  font-weight: 600;
  font-size: 0.98rem;
}

.control-card__meta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.control-card__value {
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 0.88rem;
}

.control-card__range {
  width: 100%;
  accent-color: var(--accent);
  align-self: center;
}

.angle-control {
  display: grid;
  justify-items: center;
  align-self: center;
  cursor: grab;
  user-select: none;
  touch-action: none;
}

.angle-control:active {
  cursor: grabbing;
}

.angle-control--display {
  cursor: default;
  touch-action: auto;
}

.angle-control__svg {
  width: min(92px, 100%);
  max-width: 92px;
  overflow: visible;
}

.angle-control__track {
  fill: none;
  stroke: rgba(14, 165, 233, 0.22);
  stroke-width: 4;
}

.angle-control__arm {
  stroke: var(--accent-strong);
  stroke-width: 2.5;
  stroke-linecap: round;
}

.angle-control__handle {
  fill: var(--accent-warm);
  stroke: white;
  stroke-width: 2.5;
  filter: drop-shadow(0 6px 10px rgba(15, 35, 62, 0.12));
}

.segmented-control {
  display: inline-flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  align-self: center;
}

.segmented-control__button {
  border: 1px solid var(--border-strong);
  background: white;
  color: var(--muted);
  border-radius: 12px;
  padding: 0.58rem 0.78rem;
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
}

.segmented-control__button.is-active {
  background: linear-gradient(135deg, var(--accent-strong), var(--accent));
  color: white;
  border-color: transparent;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  align-items: start;
}

.chart-panel {
  display: grid;
  gap: 1rem;
  align-content: start;
  border-radius: var(--radius-xl);
  padding: 1rem;
  min-width: 0;
}

.chart-panel--wide {
  min-height: 430px;
}

.chart-panel--interactive {
  grid-template-rows: repeat(3, auto) minmax(0, 1fr);
  height: 560px;
}

.chart-panel canvas {
  width: 100% !important;
  height: 340px !important;
  max-height: 340px;
  display: block;
}

.chart-panel--wide canvas {
  min-height: 340px;
}

.chart-panel--interactive canvas {
  height: 100% !important;
  max-height: none;
  min-height: 0;
}

.metric-card {
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin-top: 1rem;
}

.metric-card--stack {
  display: grid;
  gap: 1rem;
}

.comparison-card {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--border);
}

.comparison-card__header {
  display: grid;
  gap: 0.35rem;
}

.comparison-card__grid,
.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.comparison-card__panel,
.stat-chip {
  padding: 0.9rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--border);
}

.comparison-card__label,
.stat-chip__label {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.74rem;
  font-weight: 600;
}

.comparison-card__equation {
  min-height: 72px;
}

.stat-chip__value {
  font-family: var(--font-mono);
  font-size: 1.05rem;
}

.stats-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.stats-table th,
.stats-table td {
  text-align: left;
  padding: 0.72rem 0.4rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.stats-table th {
  color: var(--muted);
  font-weight: 600;
}

.stats-table__formula,
.stats-table__value {
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.stats-table__value {
  white-space: nowrap;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.chapter-card {
  display: grid;
  gap: 0.8rem;
  padding: 1.2rem;
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: inherit;
}

.chapter-card h3 {
  font-size: 1.15rem;
}

.chapter-pager__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.chapter-pager__card {
  display: grid;
  gap: 0.55rem;
  padding: 1.2rem;
  border-radius: var(--radius-xl);
  text-decoration: none;
  color: inherit;
}

.chapter-pager__card--empty {
  visibility: hidden;
}

.atlas-family-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.atlas-family-card {
  display: grid;
  gap: 0.9rem;
}

.atlas-family-card--direct {
  background: linear-gradient(180deg, rgba(249, 115, 22, 0.08), rgba(255, 255, 255, 0.72));
}

.atlas-family-card--external {
  background: linear-gradient(180deg, rgba(20, 184, 166, 0.08), rgba(255, 255, 255, 0.72));
}

.atlas-family-card--objective {
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.08), rgba(255, 255, 255, 0.72));
}

.atlas-mini-chip-row,
.atlas-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.atlas-mini-chip,
.atlas-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.42rem 0.72rem;
  border-radius: 999px;
  font-size: 0.83rem;
  font-weight: 600;
}

.atlas-mini-chip {
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid var(--border);
  color: var(--text);
}

.atlas-badge {
  border: 1px solid transparent;
  background: rgba(14, 165, 233, 0.08);
  color: var(--accent-strong);
}

.atlas-badge--set {
  background: rgba(249, 115, 22, 0.14);
  color: #9a3412;
}

.atlas-badge--point {
  background: rgba(14, 165, 233, 0.14);
  color: var(--accent-strong);
}

.atlas-badge--sampled {
  background: rgba(17, 35, 61, 0.08);
  color: var(--text);
}

.atlas-badge--extension {
  background: rgba(20, 184, 166, 0.14);
  color: #0f766e;
}

.atlas-switchboard__bar {
  position: sticky;
  top: 0.85rem;
  z-index: 50;
  padding: 0.95rem;
  border-radius: var(--radius-lg);
  background: rgba(246, 249, 253, 0.9);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
}

.atlas-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.atlas-tab {
  display: grid;
  gap: 0.32rem;
  align-content: start;
  min-height: 124px;
  padding: 0.9rem 0.95rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.86);
  color: var(--text);
  text-align: left;
  font: inherit;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.atlas-tab:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.atlas-tab.is-active {
  border-color: transparent;
  background: linear-gradient(145deg, rgba(3, 105, 161, 0.96), rgba(14, 165, 233, 0.88));
  color: white;
  box-shadow: 0 18px 36px rgba(3, 105, 161, 0.24);
}

.atlas-tab__family,
.atlas-tab__selector,
.atlas-method-table__family {
  color: var(--muted);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.atlas-tab.is-active .atlas-tab__family,
.atlas-tab.is-active .atlas-tab__selector {
  color: rgba(255, 255, 255, 0.78);
}

.atlas-lab {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(0, 1.28fr);
  gap: 1rem;
  align-items: start;
}

.atlas-side-column,
.atlas-chart-stack {
  display: grid;
  gap: 1rem;
}

.atlas-method-card__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.atlas-formula-panel {
  font-size: 1.02rem;
}

.atlas-chart-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.atlas-chart-panel {
  min-height: 320px;
}

.atlas-chart-panel canvas {
  width: 100% !important;
  height: 320px !important;
  max-height: none;
}

.atlas-legend {
  align-items: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.atlas-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
}

.atlas-legend__swatch {
  width: 36px;
  height: 0;
  border-top: 3px solid currentColor;
  border-radius: 999px;
}

.atlas-legend__swatch--baseline {
  color: rgba(17, 35, 61, 0.3);
}

.atlas-legend__swatch--highlight {
  color: var(--accent-strong);
}

.atlas-selection-card__matrix {
  min-height: 98px;
}

.atlas-selection-card__empty {
  display: grid;
  justify-items: center;
  gap: 0.35rem;
  padding: 1rem;
  border-radius: var(--radius-md);
  background: rgba(14, 165, 233, 0.05);
  border: 1px solid rgba(14, 165, 233, 0.1);
}

.atlas-selection-card__count {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  line-height: 1;
}

.atlas-selection-card__label {
  color: var(--muted);
  text-align: center;
}

.atlas-table-card {
  overflow-x: auto;
}

.atlas-method-table td:first-child strong {
  display: block;
}

.atlas-home-link {
  display: grid;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.atlas-home-link__meta {
  display: flex;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.setup-framework {
  scroll-margin-top: 1rem;
}

.setup-intro {
  display: grid;
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 1.02rem;
}

.setup-pipeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
}

.setup-pipeline > div,
.setup-callout,
.chart-note,
.matrix-note {
  padding: 0.8rem 0.9rem;
  border-radius: var(--radius-md);
  background: var(--surface-note);
  border: 1px solid var(--border);
}

.setup-pipeline > div {
  display: grid;
  gap: 0.28rem;
}

.setup-pipeline p,
.setup-callout,
.chart-note,
.matrix-note {
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.setup-pipeline__step {
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  font-weight: 800;
}

.setup-pipeline strong,
.setup-callout strong {
  color: var(--text);
}

.setup-callout {
  display: flex;
  gap: 0.55rem;
  align-items: baseline;
  border-left: 3px solid rgba(3, 105, 161, 0.36);
}

.chart-note,
.matrix-note {
  border-left: 3px solid rgba(3, 105, 161, 0.24);
}

.atlas-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  align-items: center;
  padding: 0.72rem 0.82rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 650;
}

.atlas-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
}

.legend-line {
  display: inline-block;
  width: 28px;
  height: 4px;
  border-radius: 999px;
  background: rgba(17, 35, 61, 0.22);
}

.legend-line--pale {
  background: rgba(17, 35, 61, 0.18);
}

.legend-line--active {
  background: var(--accent-warm);
}

.legend-line--selected {
  background: var(--success);
}

.legend-line--loss {
  background: #d95f2c;
}

.setup-step {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
  gap: 1rem;
  align-items: stretch;
  padding: 1rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.58);
}

.setup-step--wide {
  grid-template-columns: 1fr;
}

.setup-step--balanced {
  align-items: stretch;
}

.setup-step__copy {
  display: grid;
  gap: 0.65rem;
  align-content: start;
}

.setup-step__copy h3 {
  font-size: clamp(1.2rem, 1.7vw, 1.55rem);
}

.setup-step__copy p {
  color: var(--muted);
}

.plot-card,
.equation-card {
  min-width: 0;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: var(--shadow-sm);
}

.plot-card {
  padding: 0.75rem;
}

.plot-card canvas {
  display: block;
  width: 100%;
  height: 300px;
}

.plot-card--wide canvas {
  height: 380px;
}

.plot-card--fill {
  display: flex;
}

.plot-card--fill canvas {
  min-height: 340px;
  height: 100%;
  flex: 1;
}

.equation-card {
  display: grid;
  gap: 0.85rem;
  align-content: center;
  padding: 1.05rem 1.15rem;
}

.equation-card code,
.atlas-formula-panel code {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  padding: 0.08rem 0.18rem;
  border-radius: 0.25rem;
  background: transparent;
  border: 0;
  font-family: var(--math-font);
  font-size: 1.04em;
  white-space: normal;
}

.equation-card__label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.74rem;
  font-weight: 700;
}

.rotation-lab {
  display: grid;
  gap: 1rem;
}

.derivation-card {
  display: grid;
  gap: 0.75rem;
}

.derivation-stack {
  display: grid;
  gap: 0.62rem;
}

.mixing-diagram {
  display: grid;
  gap: 0.85rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
  box-shadow: var(--shadow-sm);
}

.mixing-diagram__copy {
  display: grid;
  gap: 0.45rem;
}

.mixing-diagram__copy p {
  max-width: 76ch;
  color: var(--muted);
}

.mixing-equations {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.mixing-equations .math-token {
  display: block;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-note);
  line-height: 1.55;
}

.mixing-weight-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.65rem;
}

.mixing-weight {
  display: grid;
  gap: 0.35rem;
  min-width: 0;
  padding: 0.72rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
}

.mixing-weight__name {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  font-weight: 850;
}

.mixing-weight strong {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.mixing-weight small {
  color: var(--muted);
  line-height: 1.35;
}

.mixing-weight__bar {
  position: relative;
  overflow: hidden;
  height: 0.42rem;
  border-radius: 999px;
  background: rgba(17, 35, 61, 0.08);
}

.mixing-weight__bar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--accent-strong);
}

.mixing-weight.is-negative .mixing-weight__bar i {
  background: var(--accent-warm);
}

.fevd-lab {
  gap: 1rem;
}

.fevd-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  gap: 1rem;
  align-items: stretch;
}

.fevd-table-card {
  display: grid;
  align-content: start;
  gap: 0.7rem;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.78);
}

.fevd-table-card h4 {
  font-size: 1.02rem;
}

.fevd-table {
  font-size: 0.9rem;
}

.rotation-control-slot {
  display: block;
}

.rotation-control {
  display: grid;
  grid-template-columns: minmax(220px, max-content) auto;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  padding: 0.9rem;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 92% 12%, rgba(249, 115, 22, 0.14), transparent 28%),
    rgba(255, 255, 255, 0.78);
  border: 1px solid var(--border);
}

.rotation-control--circle {
  position: relative;
}

.rotation-control__panel {
  display: block;
  min-width: 0;
  justify-self: center;
}

.rotation-control__caption {
  grid-column: 1 / -1;
  justify-self: center;
  max-width: 68ch;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
  text-align: center;
}

.matrix-readout__label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  font-weight: 700;
}

.rotation-dial {
  --rotation-angle: 0deg;
  --knob-x: 50%;
  --knob-y: 8.5%;
  position: relative;
  width: 118px;
  height: 118px;
  border: 0;
  border-radius: 999px;
  cursor: grab;
  touch-action: none;
}

.rotation-dial:active {
  cursor: grabbing;
}

.rotation-dial__ring,
.rotation-dial__arc,
.rotation-dial__ticks,
.rotation-dial__axis,
.rotation-dial__knob,
.rotation-dial__value {
  position: absolute;
  pointer-events: none;
}

.rotation-dial__ring {
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.96) 0 54%, transparent 55%),
    conic-gradient(from 0deg, rgba(17, 35, 61, 0.08), rgba(17, 35, 61, 0.08));
  box-shadow: inset 0 0 0 1px rgba(15, 35, 62, 0.12), var(--shadow-sm);
}

.rotation-dial__arc {
  inset: 0;
  border-radius: inherit;
  background: conic-gradient(from -90deg, var(--accent-strong), var(--success), var(--accent-warm), var(--accent-strong));
  mask: radial-gradient(circle, transparent 0 56%, black 57% 70%, transparent 71%);
  opacity: 0.95;
}

.rotation-dial__ticks {
  inset: 10px;
  border-radius: inherit;
  background: repeating-conic-gradient(rgba(17, 35, 61, 0.24) 0deg 1deg, transparent 1deg 12deg);
  mask: radial-gradient(circle, transparent 0 82%, black 83%);
}

.rotation-dial__axis {
  left: 50%;
  top: 50%;
  background: rgba(17, 35, 61, 0.12);
  transform: translate(-50%, -50%);
}

.rotation-dial__axis--x {
  width: 74px;
  height: 1px;
}

.rotation-dial__axis--y {
  width: 1px;
  height: 74px;
}

.rotation-dial__value {
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 72px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.2;
  font-weight: 700;
  color: var(--text);
}

.rotation-dial__knob {
  left: var(--knob-x);
  top: var(--knob-y);
  width: 19px;
  height: 19px;
  border-radius: 999px;
  background: white;
  border: 4px solid var(--accent-warm);
  box-shadow: 0 8px 18px rgba(249, 115, 22, 0.26);
  transform: translate(-50%, -50%);
  transition: left 120ms ease, top 120ms ease, transform 120ms ease;
}

.rotation-control__details {
  min-width: 0;
  justify-self: center;
}

.rotation-readout {
  padding: 0.9rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
}

.rotation-readout__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  align-items: stretch;
}

.rotation-readout__grid > * {
  min-width: 0;
  padding: 0.8rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.rotation-readout strong {
  display: block;
  margin: 0.2rem 0;
  font-family: var(--font-heading);
}

.rotation-readout p {
  color: var(--muted);
  font-size: 0.92rem;
}

.scatter-grid,
.setup-irf-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.matrix-readout {
  display: grid;
  gap: 0.5rem;
  justify-items: center;
  text-align: center;
}

.matrix-readout__equation {
  display: inline-flex;
  align-items: center;
  gap: 0.48rem;
}

.matrix-readout__lhs {
  font-family: var(--math-font);
  font-size: 0.96rem;
  font-weight: 700;
  white-space: nowrap;
}

.matrix-shell {
  display: inline-flex;
  align-items: stretch;
  gap: 0.35rem;
}

.matrix-shell__bracket {
  width: 0.58rem;
  border-top: 2px solid rgba(17, 35, 61, 0.68);
  border-bottom: 2px solid rgba(17, 35, 61, 0.68);
}

.matrix-shell__bracket--left {
  border-left: 2px solid rgba(17, 35, 61, 0.68);
  border-radius: 0.5rem 0 0 0.5rem;
}

.matrix-shell__bracket--right {
  border-right: 2px solid rgba(17, 35, 61, 0.68);
  border-radius: 0 0.5rem 0.5rem 0;
}

.matrix-readout table {
  width: fit-content;
  border-collapse: separate;
  border-spacing: 0.28rem;
  font-family: var(--font-mono);
}

.matrix-readout td {
  min-width: 3.35rem;
  padding: 0.35rem 0.45rem;
  border-radius: 0.38rem;
  background: transparent;
  text-align: right;
}

.math-stack {
  display: grid;
  gap: 0.9rem;
}

.math-card {
  display: grid;
  gap: 0.65rem;
  min-width: 0;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
  border: 1px solid var(--border);
  box-shadow: none;
}

.math-card--compact {
  align-content: start;
  align-self: start;
}

.math-card--accent {
  background: var(--surface-panel);
  border-left: 1px solid var(--border);
}

.math-card__label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  font-weight: 700;
}

.math-card__formula,
.math-token {
  font-family: var(--math-font);
  color: var(--text);
}

.math-card__formula {
  overflow-x: auto;
  padding: 0.82rem 0.9rem;
  border-radius: var(--radius-md);
  background: var(--surface-note);
  border: 1px solid var(--border);
  font-size: 1.08rem;
  line-height: 1.65;
}

.math-card p {
  color: var(--muted);
  font-size: 0.92rem;
}

.matrix-eq {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.matrix-bracket {
  display: inline-grid;
  grid-template-columns: 1fr;
  gap: 0.2rem;
  padding: 0.25rem 0.6rem;
  border-left: 2px solid currentColor;
  border-right: 2px solid currentColor;
  border-radius: 9px;
}

.matrix-bracket--square {
  grid-template-columns: repeat(2, minmax(3rem, auto));
}

.equation-stack-inline {
  display: grid;
  gap: 0.28rem;
}

.plot-card--interactive {
  position: relative;
}

.plot-tooltip {
  position: absolute;
  z-index: 20;
  display: none;
  min-width: 160px;
  max-width: 240px;
  padding: 0.65rem 0.72rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-md);
  color: var(--text);
  font-size: 0.82rem;
  pointer-events: none;
}

.plot-tooltip.is-visible {
  display: grid;
  gap: 0.28rem;
}

.plot-tooltip span {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.plot-tooltip i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 999px;
}

.identification-problem-card {
  background:
    radial-gradient(circle at 100% 0%, rgba(20, 184, 166, 0.12), transparent 28%),
    rgba(255, 255, 255, 0.62);
}

.method-atlas {
  scroll-margin-top: 1rem;
}

.method-card-list {
  display: grid;
  gap: 1.25rem;
}

.method-card {
  display: grid;
  min-width: 0;
  gap: 1.2rem;
  padding: 1.05rem;
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  scroll-margin-top: 2.5rem;
}

.method-card__header,
.method-card__intro,
.method-card__plot-grid,
.method-readout-grid {
  display: grid;
  gap: 1rem;
}

.method-card__header {
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
}

.method-card__header h3 {
  font-size: clamp(1.45rem, 2.4vw, 2.2rem);
}

.method-summary-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.65rem;
}

.method-summary-strip,
.method-card__intro,
.method-section,
.method-detail-card {
  margin-top: 1rem;
}

.method-summary-strip > div {
  display: grid;
  gap: 0.22rem;
  padding: 0.72rem 0.8rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.method-summary-strip span {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  font-weight: 800;
}

.method-summary-strip strong {
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.42;
}

.method-card__intro {
  grid-template-columns: 1fr;
  align-items: start;
}

.method-copy {
  display: grid;
  gap: 0.45rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  align-self: start;
}

.method-copy p {
  color: var(--text);
  max-width: 66ch;
}

.method-copy__grid {
  display: grid;
  gap: 0.7rem;
}

.method-copy__grid div {
  display: grid;
  gap: 0.25rem;
}

.method-copy__grid strong {
  color: var(--text);
  font-size: 0.92rem;
}

.method-copy__grid p {
  color: var(--muted);
}

.method-chart-takeaway {
  width: 100%;
  padding: 0.74rem 0.86rem;
  border-radius: var(--radius-md);
  background: var(--surface-note);
  border: 1px solid var(--border);
  border-left: 3px solid rgba(3, 105, 161, 0.34);
  color: var(--muted);
}

.method-card__plot-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: stretch;
}

.method-section {
  display: grid;
  gap: 0.9rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
}

.method-section__header {
  display: grid;
  gap: 0.36rem;
  max-width: 88ch;
}

.method-section__header h4 {
  font-size: 1.18rem;
}

.method-section__header p {
  color: var(--muted);
}

.method-section--criterion {
  background: var(--surface-panel);
}

.method-section--irfs {
  background: var(--surface-panel);
}

.method-card__toolbar {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
  padding: 0.75rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--border);
}

.method-detail-card {
  display: grid;
  gap: 0.58rem;
  padding: 1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
  border: 1px solid var(--border);
}

.method-detail-card h4 {
  margin: 0.2rem 0 0;
  font-size: 1.1rem;
}

.method-detail-card p {
  color: var(--muted);
  max-width: 86ch;
}
.method-detail-card__header {
  display: grid;
  gap: 0.38rem;
  max-width: 92ch;
}

.method-reading-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.7rem;
  margin: 0.25rem 0 0;
  padding: 0;
  list-style: none;
}
.method-reading-steps--4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}


.method-reading-steps li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-content: start;
  gap: 0.62rem;
  padding: 0.82rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.method-reading-steps__number {
  display: grid;
  width: 1.7rem;
  height: 1.7rem;
  place-items: center;
  border-radius: 999px;
  background: var(--accent-strong);
  color: white;
  font-size: 0.78rem;
  font-weight: 800;
}

.method-reading-steps h5,
.method-literature-section h5,
.method-literature-questions h5 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-heading);
  font-size: 0.96rem;
  line-height: 1.35;
}

.method-reading-steps p {
  margin-top: 0.32rem;
  font-size: 0.9rem;
  line-height: 1.52;
}

.method-detail-card__divider {
  width: 100%;
  height: 1px;
  margin: 0.45rem 0 0.2rem;
  background: var(--border);
}

.method-literature-overview {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.method-literature-section {
  display: grid;
  align-content: start;
  gap: 0.34rem;
  padding: 0.82rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  border-top: 3px solid rgba(3, 105, 161, 0.28);
}
.method-literature-section:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}


.method-literature-section p {
  font-size: 0.92rem;
  line-height: 1.58;
}

.method-literature-questions {
  display: grid;
  gap: 0.42rem;
  padding: 0.82rem;
  border-radius: var(--radius-md);
  background: var(--surface-note);
  border: 1px solid var(--border);
}

.method-literature-questions ul {
  display: grid;
  gap: 0.38rem;
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}


.method-detail-card__criterion {
  width: fit-content;
  max-width: 100%;
  padding: 0.62rem 0.72rem;
  border-radius: var(--radius-md);
  background: var(--surface-note);
  border: 1px solid var(--border);
}

.plot-card__note {
  margin-top: 0.58rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

.method-literature-list {
  margin: 0.65rem 0 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.method-literature-list li + li {
  margin-top: 0.35rem;
}

.method-literature-details {
  width: 100%;
  max-width: 100%;
  margin-top: 0.2rem;
  padding: 0.68rem 0.78rem;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
}

.method-literature-details--visible h4 {
  margin: 0 0 0.45rem;
  color: var(--accent-strong);
  font-family: var(--font-heading);
  font-size: 0.95rem;
}

.aligned-equation {
  display: grid;
  gap: 0.38rem;
  margin-top: 0.7rem;
  padding: 0.75rem 0.82rem;
  border-radius: var(--radius-md);
  background: var(--surface-note);
  border: 1px solid var(--border);
  font-family: var(--math-font);
  overflow-x: auto;
}

.aligned-equation__row {
  display: grid;
  grid-template-columns: auto auto minmax(140px, 1fr);
  align-items: baseline;
  gap: 0.5rem;
  white-space: nowrap;
}

.aligned-equation__lhs,
.aligned-equation__eq {
  font-weight: 700;
}

.method-specific-callout:empty,
.method-specific-callout[hidden] {
  display: none;
}

.narrative-callout {
  display: grid;
  gap: 0.25rem;
  padding: 0.95rem 1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--border);
}

.narrative-callout strong {
  font-family: var(--font-heading);
  font-size: 1.15rem;
}

.narrative-callout p {
  color: var(--muted);
}

.narrative-callout.is-accepted {
  border-color: rgba(20, 184, 166, 0.32);
  border-left: 3px solid var(--success);
  background: var(--surface-panel);
}

.narrative-callout.is-rejected {
  border-color: rgba(249, 115, 22, 0.32);
  border-left: 3px solid var(--accent-warm);
  background: var(--surface-panel);
}

.objective-status,
.method-diagnostics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
}

.objective-direction {
  padding: 0;
  border-radius: var(--radius-md);
  background: transparent;
  border: 0;
  color: var(--muted);
}

.criterion-dashboard {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  gap: 0.85rem;
  align-items: stretch;
}

.criterion-dashboard--rule-only {
  grid-template-columns: minmax(0, 1fr);
}

.criterion-rule-card,
.criterion-matrix-card {
  display: grid;
  align-content: start;
  gap: 0.7rem;
  min-width: 0;
  padding: 0.95rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-panel);
}

.criterion-rule-card__label,
.criterion-matrix-card__label {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  font-weight: 850;
}

.criterion-rule-card__formula {
  width: 100%;
  min-width: 0;
  padding: 0.82rem 0.92rem;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  background: var(--surface-note);
  border: 1px solid rgba(15, 35, 62, 0.09);
  border-left: 3px solid rgba(3, 105, 161, 0.34);
  font-family: var(--math-font);
  font-size: 1.08rem;
  line-height: 1.65;
}

.criterion-matrix-card {
  justify-items: center;
  text-align: center;
}

.criterion-matrix-card__body {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
}

.criterion-matrix-card__lhs {
  font-family: var(--math-font);
  font-weight: 850;
  white-space: nowrap;
}

.criterion-matrix-card p {
  max-width: 28ch;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.criterion-matrix table {
  border-collapse: separate;
  border-spacing: 0.28rem;
}

.criterion-matrix__cell {
  min-width: 3.15rem;
  padding: 0.34rem 0.48rem;
  border-radius: 0.38rem;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.criterion-matrix__cell--dim {
  color: rgba(91, 111, 141, 0.68);
  background: transparent;
}

.criterion-matrix__cell--focus {
  color: var(--text);
  background: rgba(249, 115, 22, 0.08);
  box-shadow: inset 0 -2px 0 rgba(249, 115, 22, 0.72);
  font-weight: 900;
  transform: none;
}

.objective-status--summary {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.35rem;
  padding: 0.7rem 0 0;
  border-top: 1px solid rgba(15, 35, 62, 0.1);
  color: var(--text);
}

.objective-status--summary > span {
  min-width: 0;
}

.objective-status__stack {
  display: grid;
  gap: 0.28rem;
  white-space: normal;
}

.method-readout-grid {
  grid-template-columns: minmax(0, 1fr) minmax(260px, auto);
  align-items: start;
}

.matrix-readout--explained {
  width: fit-content;
  max-width: 100%;
  padding: 0.8rem;
  border-radius: var(--radius-md);
  background: var(--surface-panel);
  border: 1px solid var(--border);
}

.method-irf-grid .plot-card canvas {
  height: 260px;
}

.closing-synthesis__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
}

.closing-synthesis__grid > div {
  display: grid;
  gap: 0.35rem;
  padding: 0.95rem 1rem;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
}

.closing-synthesis__grid span {
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  font-size: 0.72rem;
  font-weight: 800;
}

.closing-synthesis__grid strong {
  color: var(--text);
}

.closing-synthesis__grid p {
  color: var(--muted);
}

.method-card:not(.method-card--irfs-all) .method-irf-panel--secondary {
  display: none;
}

.site-footer {
  margin-top: 0;
  box-sizing: border-box;
  width: 100%;
  margin-right: 0;
  margin-left: 0;
  padding: 1.05rem max(1.25rem, calc((100vw - var(--content-width)) / 2));
  border-top: 1px solid var(--border);
  border-right: 0;
  border-bottom: 0;
  border-left: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), rgba(238, 243, 249, 0.78));
  color: var(--muted);
  box-shadow: none;
  text-align: center;
}

.site-footer a {
  color: var(--accent-strong);
  font-weight: 750;
}

.atlas-next-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  margin-top: auto;
  margin-bottom: 1.1rem;
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background:
    radial-gradient(circle at 92% 14%, rgba(249, 115, 22, 0.12), transparent 28%),
    rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-sm);
}

.atlas-next-card:empty {
  display: none;
}

.atlas-next-card__content {
  display: grid;
  gap: 0.32rem;
  min-width: 0;
}

.atlas-next-card h2 {
  font-size: clamp(1.35rem, 2vw, 1.85rem);
}

.atlas-next-card p {
  max-width: 72ch;
  color: var(--muted);
}

.atlas-next-card small {
  color: var(--muted);
  font-weight: 750;
}

.method-page-shell {
  width: min(calc(100% - 32px), calc(var(--content-width) + 392px));
  padding-bottom: 0;
}

.method-page-shell > .atlas-timeline,
.method-page-shell > .hero,
.method-page-shell > .method-matlab,
.method-page-shell > .atlas-next-card {
  max-width: var(--content-width);
  margin-right: auto;
  margin-left: auto;
}

.method-back-link {
  color: var(--accent-strong);
  font-weight: 800;
  text-decoration: none;
}

.method-page-layout,
.method-page-root .method-card {
  margin-bottom: 1.3rem;
}

.method-page-layout {
  display: flex;
  max-width: var(--content-width);
  flex-direction: column;
  gap: 0.9rem;
  margin-right: auto;
  margin-left: auto;
}

.method-page-root .method-card {
  display: block;
}

.method-page-root .method-card > :not(.method-card__control) {
  min-width: 0;
}

.method-cockpit-root {
  position: sticky;
  top: 4rem;
  order: -1;
  z-index: 30;
  overflow: visible;
}

.method-cockpit-root .method-card__control {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.method-cockpit-root .rotation-control {
  grid-template-columns: minmax(184px, max-content) auto;
  justify-content: center;
  gap: 0.7rem;
  padding: 0.58rem 0.68rem;
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 96% 6%, rgba(249, 115, 22, 0.12), transparent 24%),
    #fff;
}

.method-cockpit-root .matrix-readout--explained {
  padding: 0.52rem;
  border-radius: var(--radius-sm);
}

.method-cockpit-root .matrix-readout {
  gap: 0.28rem;
}

.method-cockpit-root .matrix-readout__label {
  font-size: 0.62rem;
}

.method-cockpit-root .matrix-readout__lhs {
  font-size: 0.82rem;
}

.method-cockpit-root .matrix-shell {
  gap: 0.22rem;
}

.method-cockpit-root .matrix-shell__bracket {
  width: 0.45rem;
}

.method-cockpit-root .matrix-readout table {
  border-spacing: 0.18rem;
}

.method-cockpit-root .matrix-readout td {
  min-width: 2.75rem;
  padding: 0.24rem 0.34rem;
  border-radius: 0.42rem;
  font-size: 0.82rem;
}

.method-cockpit-root .rotation-dial {
  width: 92px;
  height: 92px;
}

.method-cockpit-root .rotation-dial__ticks {
  inset: 8px;
}

.method-cockpit-root .rotation-dial__axis--x {
  width: 56px;
}

.method-cockpit-root .rotation-dial__axis--y {
  height: 56px;
}

.method-cockpit-root .rotation-dial__value {
  width: 58px;
  font-size: 0.62rem;
}

.method-cockpit-root .rotation-dial__knob {
  width: 16px;
  height: 16px;
  border-width: 3px;
}

.mobile-rotation-toggle {
  display: none;
}

@media (min-width: 900px) {
  .method-page-layout {
    display: grid;
    max-width: min(100%, calc(var(--content-width) + 328px));
    grid-template-columns: minmax(0, 1fr) 296px;
    gap: 1rem;
    align-items: start;
  }

  .method-cockpit-root {
    top: 4.35rem;
    order: 0;
  }

  .method-cockpit-root .rotation-control {
    grid-template-columns: 1fr;
    gap: 0.58rem;
    justify-items: center;
    padding: 0.72rem;
  }

  .method-cockpit-root .rotation-dial {
    width: 104px;
    height: 104px;
  }

  .method-cockpit-root .rotation-dial__axis--x {
    width: 64px;
  }

  .method-cockpit-root .rotation-dial__axis--y {
    height: 64px;
  }

  .method-cockpit-root .rotation-dial__value {
    width: 64px;
    font-size: 0.66rem;
  }
}

.method-step-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  margin-bottom: 0.9rem;
}

.method-step-nav__context {
  display: grid;
  gap: 0.25rem;
  min-width: 0;
}

.method-step-nav__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: end;
  gap: 0.55rem;
}

.method-step-nav span {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.68rem;
  font-weight: 850;
}

.method-step-nav strong {
  font-family: var(--font-heading);
  font-size: 1.1rem;
}

.method-step-nav p {
  margin: 0;
  color: var(--muted);
}

.shared-code-disclosure {
  margin-bottom: 1rem;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.72);
}

.shared-code-disclosure summary {
  cursor: pointer;
  color: var(--accent-strong);
  font-weight: 850;
}

.shared-code-disclosure[open] summary {
  margin-bottom: 0.75rem;
}

.matlab-run-guide {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.78);
}

.matlab-run-guide strong {
  display: block;
  margin-bottom: 0.55rem;
  font-family: var(--font-heading);
}

.matlab-run-guide ol {
  display: grid;
  gap: 0.35rem;
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.matlab-run-guide li {
  padding-left: 0.15rem;
}

.matlab-run-guide__note {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.code-panel {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface-elevated);
}

.code-panel__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: start;
}

.code-panel__header h3 {
  font-size: 1.2rem;
}

.code-panel__header p {
  color: var(--muted);
}

.code-panel__source {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

.code-panel__actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: end;
}

.code-panel pre {
  max-height: 520px;
  margin: 0;
  padding: 1rem;
  overflow: auto;
  border-radius: var(--radius-md);
  background: #0f172a;
  color: #e5edf7;
  font-size: 0.82rem;
  line-height: 1.55;
}

.code-panel code {
  white-space: pre;
}

.code-panel__status {
  min-height: 1.4em;
  color: var(--accent-strong);
  font-size: 0.9rem;
  font-weight: 750;
}

#loading-screen {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: clamp(1rem, 4vw, 3rem);
  overflow: hidden;
  background:
    radial-gradient(circle at 24% 22%, rgba(14, 165, 233, 0.2), transparent 30%),
    radial-gradient(circle at 78% 18%, rgba(249, 115, 22, 0.14), transparent 24%),
    linear-gradient(180deg, #f7fbff 0%, #eaf2fb 100%);
  z-index: 2000;
  transition: opacity 460ms ease;
}

#loading-screen[hidden] {
  display: none;
}

#loading-screen::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.62) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.62) 1px, transparent 1px);
  background-size: 46px 46px;
  opacity: 0.24;
  pointer-events: none;
}

#loading-screen.fade-out {
  opacity: 0;
  pointer-events: none;
}

.loader--atlas {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 1rem;
  width: min(920px, calc(100vw - 32px));
  padding: clamp(1.25rem, 4vw, 2.75rem);
  overflow: hidden;
  text-align: center;
  border-radius: 36px;
  background:
    radial-gradient(circle at 16% 18%, rgba(20, 184, 166, 0.16), transparent 22%),
    radial-gradient(circle at 84% 4%, rgba(249, 115, 22, 0.13), transparent 24%),
    rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(15, 35, 62, 0.1);
  box-shadow: var(--shadow-lg);
}

.loader--atlas::after {
  content: '';
  position: absolute;
  width: 280px;
  height: 280px;
  right: -92px;
  bottom: -130px;
  border-radius: 999px;
  border: 38px solid rgba(3, 105, 161, 0.08);
  box-shadow: inset 0 0 0 1px rgba(3, 105, 161, 0.1);
  pointer-events: none;
}

.loader__eyebrow {
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.loader__headline {
  max-width: 760px;
  font-size: 4.8rem;
  line-height: 0.92;
  color: var(--text);
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

.loader__copy {
  max-width: 620px;
  color: var(--muted);
  font-weight: 650;
}

.loader__chart-card {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.75rem;
  width: min(780px, 100%);
  padding: 0.85rem;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
}

#loader-time-series {
  display: block;
  width: 100%;
  height: clamp(220px, 30vw, 300px);
}

.loader__legend {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 750;
}

.loader__legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.loader__swatch {
  width: 28px;
  height: 4px;
  border-radius: 999px;
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.74);
}

.loader__swatch--rate {
  background: var(--accent-strong);
}

.loader__swatch--sp500 {
  background: var(--accent-warm);
}

.loader__progress {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.45rem;
  width: min(680px, 100%);
}

.loader__progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.loader__progress-track {
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.5)),
    rgba(17, 35, 61, 0.08);
  border: 1px solid rgba(15, 35, 62, 0.09);
}

#loader-progress-bar {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent-strong), var(--success), var(--accent-warm));
  box-shadow: 0 0 22px rgba(14, 165, 233, 0.26);
}

.bullet-list,
.resource-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.bullet-list li,
.resource-list li {
  position: relative;
  padding-left: 1.3rem;
}

.bullet-list li::before,
.resource-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.72rem;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent-warm));
}

.roadmap {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.info-icon {
  display: inline-grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border: 0;
  border-radius: 999px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--accent-strong);
  font-weight: 700;
  cursor: pointer;
}

.info-popover {
  position: absolute;
  z-index: 120;
  width: min(360px, calc(100vw - 24px));
  padding: 0.9rem 1rem;
  border-radius: var(--radius-md);
  background: var(--surface-elevated);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-lg);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 560ms ease, transform 560ms ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 2px solid var(--accent-strong);
  outline-offset: 3px;
}

@media (max-width: 1080px) {
  .hero,
  .chart-grid,
  .chapter-grid,
  .chapter-pager__grid,
  .roadmap,
  .insight-grid,
  .closing-synthesis__grid,
  .guide-block__grid,
  .comparison-card__grid,
  .stat-grid,
  .atlas-family-grid,
  .atlas-chart-grid,
  .atlas-method-card__grid {
    grid-template-columns: 1fr;
  }

  .atlas-tabs {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .atlas-lab {
    grid-template-columns: 1fr;
  }

  .setup-step,
  .rotation-readout__grid,
  .mixing-equations,
  .fevd-grid,
  .method-summary-strip,
  .method-card__intro,
  .method-card__plot-grid,
  .criterion-dashboard,
  .method-detail-card,
  .method-reading-steps,
  .method-literature-overview,
  .method-readout-grid {
    grid-template-columns: 1fr;
  }

  .control-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero__content h1 {
    font-size: 3.2rem;
  }

  .setup-pipeline {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell,
  .method-page-shell {
    padding-top: 0.45rem;
  }

  .page-shell {
    width: min(calc(100% - 20px), var(--content-width));
  }

  .method-page-shell {
    width: min(calc(100% - 20px), var(--content-width));
  }

  .setup-callout {
    display: grid;
  }

  .hero,
  .section-card {
    padding: 1.2rem;
  }

  .method-page-shell > .hero {
    margin-bottom: 0.25rem;
  }

  .hero__content h1 {
    font-size: 2.55rem;
  }

  .method-page-shell > .hero .hero__content h1 {
    font-size: clamp(2rem, 10vw, 2.35rem);
  }

  #loading-screen {
    padding: 0.8rem;
  }

  .loader--atlas {
    width: min(100%, calc(100vw - 16px));
    gap: 0.8rem;
    padding: 1rem 0.85rem;
    border-radius: 26px;
  }

  .loader__headline {
    width: 100%;
    font-size: 1.9rem;
    line-height: 1;
    text-wrap: balance;
  }

  .loader__copy {
    font-size: 0.94rem;
  }

  #loader-time-series {
    height: 180px;
  }

  .loader__progress-meta {
    align-items: start;
    flex-direction: column;
    gap: 0.2rem;
    text-align: left;
  }

  .atlas-switchboard__bar {
    top: 0.4rem;
    padding: 0.75rem;
  }

  .atlas-timeline {
    top: 0;
    margin-bottom: 0.15rem;
    margin-right: 0;
    margin-left: 0;
    padding: 0.34rem;
    border-radius: var(--radius-lg);
    overflow: visible;
  }

  .atlas-timeline__toggle {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.55rem;
    width: 100%;
    padding: 0.66rem 0.74rem;
    border: 0;
    border-radius: var(--radius-md);
    background: rgba(246, 249, 253, 0.94);
    color: var(--text);
    font-family: inherit;
    text-align: left;
  }

  .atlas-timeline__toggle span,
  .atlas-timeline__toggle em {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.66rem;
    font-style: normal;
    font-weight: 850;
  }

  .atlas-timeline__toggle strong {
    min-width: 0;
    overflow: hidden;
    color: var(--text);
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.94rem;
  }

  .atlas-timeline__list {
    display: none;
    width: auto;
    min-width: 0;
    grid-template-columns: 1fr;
    gap: 0.28rem;
    margin-top: 0.42rem;
    max-height: 56vh;
    overflow: auto;
  }

  .atlas-timeline.is-open .atlas-timeline__list {
    display: grid;
  }

  .atlas-timeline__step {
    min-width: 0;
    justify-content: start;
    opacity: 0.88;
  }

  .atlas-timeline__step.is-dimmed {
    opacity: 0.62;
  }

  .atlas-tabs {
    grid-template-columns: 1fr;
  }

  .atlas-tab {
    min-height: 0;
  }

  .rotation-control {
    grid-template-columns: 1fr;
    justify-items: center;
    text-align: center;
  }

  .rotation-control__panel {
    grid-template-columns: 1fr;
  }

  .rotation-control__details {
    width: 100%;
    justify-self: stretch;
  }

  .matrix-readout__equation {
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
  }

  .aligned-equation__row {
    grid-template-columns: auto auto auto;
  }

  .scatter-grid,
  .setup-irf-grid,
  .mixing-weight-grid,
  .method-diagnostics,
  .objective-status {
    grid-template-columns: 1fr;
  }

  .method-card {
    padding: 0.9rem;
    scroll-margin-top: 1.5rem;
  }

  .method-page-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .method-cockpit-root {
    position: sticky;
    top: 3.55rem;
    order: -1;
    max-height: none;
    overflow: visible;
    z-index: 64;
  }

  .method-cockpit-root .method-card__control {
    z-index: 60;
    max-height: min(44vh, 340px);
    overflow: hidden auto;
    background: #fff;
  }

  .method-cockpit-root .method-card__control:not(.is-open) .rotation-control {
    display: none;
  }

  .method-cockpit-root .rotation-control {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.48rem 0.58rem;
    padding: 0.58rem;
    text-align: left;
  }

  .method-cockpit-root .rotation-control__panel {
    justify-self: stretch;
    min-width: 0;
  }

  .method-cockpit-root .rotation-control__details {
    justify-self: stretch;
    width: 100%;
  }

  .method-cockpit-root .matrix-readout__equation {
    flex-direction: row;
    gap: 0.26rem;
  }

  .method-cockpit-root .matrix-readout--explained {
    width: 100%;
    padding: 0.48rem;
  }

  .method-cockpit-root .matrix-readout td {
    min-width: 2.38rem;
    padding: 0.2rem 0.28rem;
    font-size: 0.74rem;
  }

  .method-cockpit-root .rotation-dial {
    width: 82px;
    height: 82px;
  }

  .method-cockpit-root .rotation-dial__axis--x {
    width: 50px;
  }

  .method-cockpit-root .rotation-dial__axis--y {
    height: 50px;
  }

  .method-cockpit-root .rotation-dial__value {
    width: 54px;
    font-size: 0.58rem;
  }

  .mobile-rotation-toggle {
    display: flex;
    width: 100%;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
    margin: 0;
    padding: 0.6rem 0.72rem;
    border: 0;
    border-bottom: 1px solid rgba(15, 35, 62, 0.08);
    border-radius: 0;
    background: rgba(246, 249, 253, 0.94);
    color: var(--text);
    font-family: inherit;
  }

  .mobile-rotation-toggle span {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.66rem;
    font-weight: 850;
  }

  .mobile-rotation-toggle strong {
    font-size: 0.84rem;
  }

  .method-step-nav {
    grid-template-columns: 1fr;
  }

  .method-step-nav__actions {
    justify-content: stretch;
  }

  .method-step-nav__actions .button {
    flex: 1 1 12rem;
  }

  .atlas-next-card {
    grid-template-columns: 1fr;
    padding: 1rem;
  }

  .atlas-next-card .button {
    width: 100%;
  }

  .code-panel__header {
    grid-template-columns: 1fr;
  }

  .code-panel__actions {
    justify-content: start;
  }

  .matlab-run-guide {
    grid-template-columns: 1fr;
  }

  .code-panel pre {
    max-height: 420px;
    font-size: 0.76rem;
  }

  .method-card__header {
    grid-template-columns: 1fr;
  }

  .plot-card canvas,
  .plot-card--wide canvas {
    height: 280px;
  }

  .atlas-chart-panel {
    min-height: 280px;
  }

  .atlas-chart-panel canvas {
    height: 280px !important;
  }

  .control-rail {
    top: 0;
  }

  .control-rail__header {
    align-items: start;
    flex-direction: column;
  }

  .control-grid {
    grid-template-columns: 1fr;
  }

  .chart-panel--interactive {
    height: 460px;
  }

  .chart-panel canvas {
    height: 280px !important;
    max-height: 280px;
  }

  .chart-panel--interactive canvas {
    height: 100% !important;
    max-height: none;
  }

}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }

  body:not(.page-ready) .page-shell {
    transform: none;
    filter: none;
  }

  body.page-ready .page-shell {
    transform: none;
    filter: none;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  
}

/* Editorial page composition: reserve framed surfaces for interactive evidence. */
.editorial-section {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: clamp(3.5rem, 7vw, 6.5rem) 0;
  border-top: 1px solid rgba(15, 35, 62, 0.12);
  scroll-margin-top: 4.5rem;
}

.editorial-section__header,
.editorial-section__intro {
  display: grid;
  gap: 0.55rem;
  max-width: 74ch;
}

.editorial-section__header {
  margin-bottom: clamp(2rem, 4vw, 3.5rem);
}

.editorial-section__header h2 {
  font-size: clamp(1.75rem, 3vw, 2.65rem);
  line-height: 1.08;
  text-wrap: balance;
}

.editorial-section__header p,
.editorial-section__intro p {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.68;
}

.editorial-section__intro {
  margin-bottom: 1.8rem;
}

.editorial-section__intro h3 {
  font-size: clamp(1.2rem, 2vw, 1.55rem);
}

.editorial-callout {
  max-width: 76ch;
  margin-top: 2rem;
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 3px solid rgba(3, 105, 161, 0.36);
  color: var(--muted);
  line-height: 1.65;
}

.method-section-spine {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
}

.method-section-spine a {
  color: var(--accent-strong);
  text-decoration: none;
}

.setup-framework.section-card {
  padding: 0;
  overflow: visible;
  border: 0;
  background: transparent;
  box-shadow: none;
}

.setup-framework.section-card::after {
  display: none;
}

.setup-framework > .section-card__header {
  max-width: 74ch;
  padding-bottom: 2.25rem;
  border-bottom: 1px solid rgba(15, 35, 62, 0.12);
}

.setup-framework > .section-card__body {
  gap: 0;
}

.setup-intro {
  gap: 1.5rem;
  padding: 2rem 0 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.setup-pipeline {
  gap: 1.25rem;
}

.setup-pipeline > div {
  padding: 1rem 0 0;
  border: 0;
  border-top: 2px solid rgba(3, 105, 161, 0.2);
  border-radius: 0;
  background: transparent;
}

.setup-framework .method-summary-strip {
  gap: 1.25rem;
  margin-top: 0.4rem;
}

.setup-framework .method-summary-strip > div {
  padding: 1rem 0 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.14);
  border-radius: 0;
  background: transparent;
}

.setup-callout,
.chart-note,
.matrix-note {
  padding: 0.2rem 0 0.2rem 0.9rem;
  border: 0;
  border-left: 3px solid rgba(3, 105, 161, 0.3);
  border-radius: 0;
  background: transparent;
}

.setup-step,
.identification-problem-card {
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding: clamp(3rem, 6vw, 5rem) 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.12);
  border-radius: 0;
  background: transparent;
}

.setup-step__copy {
  gap: 0.85rem;
}

.setup-step__copy h3 {
  font-size: clamp(1.35rem, 2.25vw, 1.9rem);
  line-height: 1.16;
}

.plot-card,
.equation-card {
  box-shadow: none;
}

.method-page-shell > .editorial-section {
  max-width: var(--content-width);
}

.method-page-shell > .atlas-timeline,
.method-page-shell > .hero,
.method-page-shell > .method-matlab,
.method-page-shell > .atlas-next-card {
  box-sizing: border-box;
  width: 100%;
}

.method-page-root .method-card {
  display: grid;
  gap: 0;
  margin-bottom: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.method-page-root .method-card__header {
  display: block;
  max-width: 76ch;
  padding-bottom: 1.8rem;
}

.method-page-root .method-card__header h2 {
  margin-top: 0.35rem;
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  line-height: 1.1;
  text-wrap: balance;
}

.method-page-root .method-summary-strip {
  gap: 0;
  margin: 0;
  padding: 1.35rem 0;
  border-top: 1px solid rgba(15, 35, 62, 0.12);
  border-bottom: 1px solid rgba(15, 35, 62, 0.12);
}

.method-page-root .method-summary-strip > div {
  padding: 0 1.2rem;
  border: 0;
  border-left: 1px solid rgba(15, 35, 62, 0.12);
  border-radius: 0;
  background: transparent;
}

.method-page-root .method-summary-strip > div:first-child {
  padding-left: 0;
  border-left: 0;
}

.method-page-root .method-card__intro {
  margin: 0;
  padding-top: 2.5rem;
}

.method-page-root .method-copy {
  gap: 0.8rem;
  max-width: 82ch;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.method-page-root .method-section {
  gap: 1.35rem;
  margin-top: clamp(3.5rem, 7vw, 6rem);
  padding: clamp(2.8rem, 5vw, 4rem) 0 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.14);
  border-radius: 0;
  background: transparent;
}

.method-section__header h3,
.method-reading-steps h3,
.method-literature-section h3,
.method-literature-questions h3 {
  margin: 0;
  color: var(--text);
  font-family: var(--font-heading);
}

.method-section__header h3 {
  font-size: clamp(1.3rem, 2.2vw, 1.75rem);
}

.method-page-root .method-card__toolbar {
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
}

.method-page-root .criterion-rule-card__formula {
  padding: 0.65rem 0 0.65rem 0.85rem;
  border: 0;
  border-left: 3px solid rgba(3, 105, 161, 0.3);
  border-radius: 0;
  background: transparent;
}

.method-page-root .method-chart-takeaway {
  padding: 0.2rem 0 0.2rem 0.9rem;
  border: 0;
  border-left: 3px solid rgba(3, 105, 161, 0.3);
  border-radius: 0;
  background: transparent;
}

.method-reading-steps {
  gap: 1.35rem;
  margin: 0;
}

.method-reading-steps li {
  gap: 0.75rem;
  padding: 1.1rem 0 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.14);
  border-radius: 0;
  background: transparent;
}

.method-reading-steps h3 {
  font-size: 1rem;
  line-height: 1.38;
}

.method-literature-overview {
  grid-template-columns: 1fr;
  gap: 0;
  width: 100%;
  max-width: none;
}

.method-literature-section,
.method-literature-section:last-child:nth-child(odd) {
  grid-column: auto;
  gap: 0.55rem;
  padding: 1.5rem 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.14);
  border-radius: 0;
  background: transparent;
}

.method-literature-section h3,
.method-literature-questions h3 {
  font-size: 1.08rem;
  line-height: 1.38;
}

.method-literature-questions {
  width: 100%;
  max-width: none;
  margin-top: 2rem;
  padding: 0.2rem 0 0.2rem 1rem;
  border: 0;
  border-left: 3px solid rgba(3, 105, 161, 0.3);
  border-radius: 0;
  background: transparent;
}

.method-reference-disclosure,
.method-secondary-irfs {
  margin-top: 2rem;
  padding: 0.9rem 0;
  border-top: 1px solid rgba(15, 35, 62, 0.14);
  border-bottom: 1px solid rgba(15, 35, 62, 0.14);
}

.method-reference-disclosure {
  width: 100%;
  max-width: none;
}

.method-literature-chapter__header,
.atlas-literature-bridge .editorial-section__header {
  width: 100%;
  max-width: none;
}

.method-reference-disclosure summary,
.method-secondary-irfs summary {
  display: flex;
  cursor: pointer;
  justify-content: space-between;
  gap: 1rem;
  color: var(--accent-strong);
  font-weight: 850;
}

.method-reference-disclosure summary span {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 700;
}

.section-citations {
  display: block;
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 550;
  line-height: 1.5;
}

.section-citations__label {
  color: var(--text);
  font-size: 0.68rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-citations a {
  color: var(--accent-strong);
  text-decoration-color: rgba(3, 105, 161, 0.35);
  text-underline-offset: 0.12em;
}

.section-citations a:hover {
  text-decoration-color: currentColor;
}

.method-literature-questions .section-citations {
  margin-top: 0.22rem;
}


.method-secondary-irfs[open] summary,
.method-reference-disclosure[open] summary {
  margin-bottom: 1.25rem;
}

.method-irf-grid--secondary {
  margin-top: 0.75rem;
}

.method-page-layout {
  display: grid;
  max-width: var(--content-width);
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  margin: 0 auto clamp(4rem, 8vw, 7rem);
}

.method-cockpit-root {
  position: sticky;
  top: 4.35rem;
  order: -1;
  align-self: start;
  z-index: 64;
}

.method-cockpit-root .method-card__control {
  box-shadow: none;
}

@media (min-width: 1400px) {
  .method-page-layout {
    max-width: min(100%, calc(var(--content-width) + 328px));
    grid-template-columns: minmax(0, 1fr) 296px;
    gap: 1.5rem;
    align-items: start;
  }

  .method-cockpit-root {
    position: sticky;
    top: 4.35rem;
    order: 0;
    z-index: 30;
  }
}

@media (max-width: 1100px) {
  .atlas-timeline {
    top: 0;
    padding: 0.34rem;
    overflow: visible;
    border-radius: var(--radius-lg);
  }

  .atlas-timeline__toggle {
    display: grid;
    width: 100%;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.55rem;
    padding: 0.66rem 0.74rem;
    border: 0;
    border-radius: var(--radius-md);
    background: rgba(246, 249, 253, 0.96);
    color: var(--text);
    font-family: inherit;
    text-align: left;
  }

  .atlas-timeline__toggle span,
  .atlas-timeline__toggle em {
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.66rem;
    font-style: normal;
    font-weight: 850;
  }

  .atlas-timeline__toggle strong {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 0.94rem;
  }

  .atlas-timeline__list {
    display: none;
    width: auto;
    min-width: 0;
    max-height: 56vh;
    grid-template-columns: 1fr;
    gap: 0.28rem;
    margin-top: 0.42rem;
    overflow: auto;
  }

  .atlas-timeline.is-open .atlas-timeline__list {
    display: grid;
  }

  .atlas-timeline__step {
    min-width: 0;
    justify-content: start;
  }

  .method-page-root .method-summary-strip > div {
    padding: 0.9rem 0 0;
    border-top: 1px solid rgba(15, 35, 62, 0.1);
    border-left: 0;
  }

  .method-page-root .method-summary-strip > div:first-child {
    padding-top: 0;
    border-top: 0;
  }
}

@media (min-width: 840px) and (max-width: 1100px) {
  .method-page-shell > .hero {
    grid-template-columns: minmax(0, 1.3fr) minmax(280px, 0.7fr);
  }
}

@media (max-width: 760px) {
  .editorial-section {
    padding: 3.5rem 0;
  }

  .method-page-layout {
    gap: 1rem;
  }

  .method-cockpit-root {
    position: sticky;
    top: 3.55rem;
    align-self: start;
    z-index: 64;
  }

  .method-cockpit-root .matrix-readout__label,
  .method-cockpit-root .rotation-dial__value {
    font-size: 0.72rem;
  }

  .method-section-spine {
    gap: 0.4rem;
  }

  .method-card__toolbar .segmented-control__button {
    flex: 1 1 100%;
  }
}

/* Reading system: prose flows freely; only bounded technical objects use cards. */
.math-card,
.math-card--accent,
.derivation-card,
.criterion-rule-card,
.criterion-matrix-card {
  gap: 0.85rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.76);
  box-shadow: none;
}

.math-card__formula,
.criterion-rule-card__formula,
.method-page-root .criterion-rule-card__formula,
.aligned-equation {
  min-width: 0;
  padding: 0.82rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface-note);
  box-shadow: none;
  font-family: var(--math-font);
  color: var(--text);
  line-height: 1.65;
}

.criterion-rule-card__note {
  display: grid;
  gap: 0.45rem;
  padding: 0.75rem 0 0;
  border-top: 1px solid rgba(15, 35, 62, 0.1);
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.55;
}

.criterion-rule-card__note p {
  margin: 0;
}

.derivation-step__label,
.derivation-row__label {
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 800;
}

.derivation-stack {
  display: grid;
  gap: 0;
  padding: 0;
}

.derivation-row {
  display: grid;
  grid-template-columns: minmax(10.5rem, 0.24fr) minmax(0, 1fr);
  gap: 0.75rem 1.1rem;
  min-width: 0;
  padding: 0.82rem 0.9rem;
}

.derivation-row + .derivation-row {
  border-top: 1px solid rgba(15, 35, 62, 0.1);
}

.derivation-row__content {
  min-width: 0;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.96rem;
}

.prose-label {
  display: block;
  margin-bottom: 0.28rem;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  line-height: 1.35;
  text-transform: uppercase;
}

.context-note,
.editorial-callout.context-note,
.setup-callout.context-note,
.matrix-note.context-note,
.method-chart-takeaway,
.method-page-root .method-chart-takeaway {
  margin-top: 0.55rem;
  padding: 0.82rem 0 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.12);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.58;
}

.setup-callout.context-note {
  display: grid;
  grid-template-columns: minmax(8.5rem, auto) minmax(0, 1fr);
  gap: 0.45rem 1rem;
  align-items: start;
}

.setup-callout.context-note .prose-label {
  margin: 0.08rem 0 0;
}

.editorial-callout.context-note {
  max-width: 76ch;
  margin-top: 2rem;
}

.reader-cue {
  padding: 0.15rem 0 0.15rem 0.9rem;
  border: 0;
  border-left: 3px solid rgba(3, 105, 161, 0.34);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
}

.math-card__note {
  margin-top: 0.05rem;
  padding: 0.75rem 0 0;
  border: 0;
  border-top: 1px solid rgba(15, 35, 62, 0.1);
  border-radius: 0;
  background: transparent;
  color: var(--muted);
}

.math-card__note .prose-label {
  margin-bottom: 0.32rem;
}

@media (max-width: 760px) {
  .setup-callout.context-note,
  .derivation-row {
    grid-template-columns: 1fr;
  }

  .derivation-row {
    gap: 0.3rem;
  }
}