/* The paper's architecture is the map, with controls around its actual parts. */
.method-walkthrough {
  margin: 0 0 56px;
  background: #fff;
  padding: 28px;
  color: var(--ink, #142c33);
}
.method-walkthrough [hidden] {
  display: none !important;
}
.method-walkthrough-heading {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 24px;
  margin-bottom: 24px;
}
.method-walkthrough h3 {
  font-size: 24px;
  letter-spacing: -0.025em;
  margin: 0 0 8px;
  line-height: 1.2;
}
.method-walkthrough-heading p {
  font-size: 15px;
  margin: 0;
}
.method-walkthrough button,
.method-walkthrough select {
  font: inherit;
  color: inherit;
  border: 1px solid #c7d4ce;
  border-radius: 4px;
  background: #fff;
  min-height: 44px;
  padding: 8px 13px;
  cursor: pointer;
  font-size: 14px;
}
.method-walkthrough button:hover {
  border-color: #336e62;
}
.method-walkthrough button:focus-visible,
.method-walkthrough select:focus-visible,
.method-diagram-scroll:focus-visible {
  outline: 3px solid #ae4a16;
  outline-offset: 3px;
}
.method-playback {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}
.method-playback #method-play {
  background: #152e32;
  color: #fff;
  border-color: #152e32;
}
.method-diagram-scroll {
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scrollbar-width: thin;
  scrollbar-color: #819e92 #edf2ee;
  padding: 5px 0 10px;
}
.method-diagram {
  position: relative;
  width: 100%;
  min-width: 1100px;
  line-height: 0;
}
.method-vector {
  display: block;
  width: 100%;
  height: auto;
  font-family: "Albert Sans", Arial, sans-serif;
  color: #203a36;
}
.method-vector text {
  fill: #263e38;
  user-select: none;
}
.method-vector .method-region {
  fill: transparent;
  stroke: transparent;
  stroke-width: 2;
  pointer-events: all;
}
.method-svg-part,
.method-svg-icon {
  cursor: pointer;
  outline: none;
}
.method-svg-part:hover > .method-region,
.method-svg-part:focus-visible > .method-region {
  stroke: #82a79b;
}
.method-svg-part.is-selected > .method-region {
  stroke: #087365;
}
.method-svg-part:focus-visible > .method-region,
.method-svg-icon:focus-visible > circle {
  stroke: #ae4a16;
  stroke-width: 3;
}
.method-flow {
  pointer-events: none;
  fill: none;
}
.method-wire {
  stroke: #52635e;
  stroke-width: 1.8;
}
.method-wire.green {
  stroke: #65975b;
}
.method-wire.red {
  stroke: #bc6058;
}
.method-signal {
  stroke: #087a72;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 2 15;
  opacity: 0;
  animation: method-travel 1.7s linear infinite;
  animation-play-state: paused;
}
.method-flow.is-active .method-signal {
  opacity: 1;
}
.method-walkthrough[data-motion="off"] .method-signal {
  opacity: 0;
}
.method-snowflake {
  transform-origin: 0 0;
  animation: method-ice 7s ease-in-out infinite;
  animation-play-state: paused;
}
.density-area {
  stroke-width: 1.8;
}
.density-area.red {
  fill: #f1ceca;
  stroke: #bc6058;
}
.density-area.green {
  fill: #dcebd4;
  stroke: #65975b;
}
.density-area.neutral {
  fill: #e9eeeb;
  stroke: #a0ada5;
  fill-opacity: 0.5;
}
.method-density-axis {
  fill: none;
  stroke: #829289;
  stroke-width: 1.5;
}
.method-density-ood {
  transform-origin: 1184px 516px;
  animation: method-ood-density 8s ease-in-out infinite alternate;
  animation-play-state: paused;
}
.method-density-id {
  transform-origin: 1331px 516px;
  animation: method-id-density 8s ease-in-out infinite alternate;
  animation-play-state: paused;
}
.method-density-bank {
  transform-origin: 977px 548px;
  animation: method-bank-density 7s ease-in-out infinite alternate;
  animation-play-state: paused;
}
.method-fire {
  transform-origin: 15px 37px;
  animation: method-flicker 0.8s ease-in-out infinite alternate;
  animation-play-state: paused;
}
.method-fire-inner {
  transform-origin: 15px 35px;
  animation: method-inner 0.55s ease-in-out infinite alternate;
  animation-play-state: paused;
}
.method-walkthrough.is-inview[data-motion="on"] .method-signal,
.method-walkthrough.is-inview[data-motion="on"] .method-fire,
.method-walkthrough.is-inview[data-motion="on"] .method-fire-inner,
.method-walkthrough.is-inview[data-motion="on"] .method-snowflake,
.method-walkthrough.is-inview[data-motion="on"] .method-density-ood,
.method-walkthrough.is-inview[data-motion="on"] .method-density-id,
.method-walkthrough.is-inview[data-motion="on"] .method-density-bank {
  animation-play-state: running;
}
.method-part-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 0;
}
.method-part-buttons button.is-selected {
  background: #e7efea;
  border-color: #6f9284;
}
.method-part-select {
  display: none;
}
.method-explanation {
  display: grid;
  grid-template-columns: minmax(210px, 0.8fr) minmax(0, 1.8fr);
  gap: 40px;
  padding-top: 28px;
  margin-top: 28px;
  border-top: 1px solid #e0e9e4;
  min-height: 265px;
}
.method-part-count {
  font-size: 13px;
  color: #546a61;
  margin: 0 0 10px;
}
.method-explanation h4 {
  font-size: 24px;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.025em;
  margin: 0;
  max-width: 22ch;
}
.method-explanation #method-part-copy {
  margin: 0;
  font-size: 17px;
  max-width: 70ch;
}
.method-part-equation {
  font-size: 16px;
  font-weight: 600;
  margin: 16px 0;
  overflow-wrap: anywhere;
}
.method-explanation .method-part-note {
  font-size: 14px;
  line-height: 1.5;
  color: #52645c;
  margin: 0 0 14px;
  max-width: 78ch;
}
#method-trace-link {
  font-size: 14px;
  text-underline-offset: 4px;
}
.method-walkthrough-footer {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 32px;
  margin-top: 20px;
}
.method-step-controls {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}
.method-walkthrough figcaption {
  font-size: 13px;
  line-height: 1.6;
  color: #52645c;
  max-width: 70ch;
  margin: 0;
}
.method-pan-hint {
  display: none;
  font-size: 13px;
  color: #52645c;
  margin: 0 0 10px;
}
@keyframes method-travel {
  to {
    stroke-dashoffset: -34;
  }
}
@keyframes method-flicker {
  0% {
    transform: scale(0.94, 1) rotate(-2deg);
  }
  60% {
    transform: scale(1.03, 0.94) rotate(1deg);
  }
  100% {
    transform: scale(0.96, 1.08) rotate(2deg);
  }
}
@keyframes method-inner {
  to {
    transform: scale(0.85, 1.14) translateY(-1px);
  }
}
@media (max-width: 1100px) {
  .method-walkthrough-heading {
    flex-direction: column;
    gap: 16px;
  }
  .method-pan-hint {
    display: block;
  }
  .method-explanation {
    grid-template-columns: minmax(170px, 0.8fr) minmax(0, 1.4fr);
    gap: 24px;
  }
}
@media (max-width: 700px) {
  .method-walkthrough {
    padding: 20px 16px;
    margin-inline: -16px;
    margin-bottom: 40px;
  }
  .method-walkthrough h3 {
    font-size: 22px;
  }
  .method-playback {
    flex-wrap: wrap;
  }
  .method-part-buttons {
    display: none;
  }
  .method-part-select {
    display: grid;
    gap: 8px;
    font-size: 14px;
    margin-top: 18px;
  }
  .method-part-select select {
    width: 100%;
    min-height: 44px;
  }
  .method-explanation {
    display: block;
    min-height: 0;
    margin-top: 22px;
    padding-top: 22px;
  }
  .method-explanation h4 {
    font-size: 22px;
    max-width: none;
    margin-bottom: 18px;
  }
  .method-explanation #method-part-copy {
    font-size: 16px;
  }
  .method-part-equation {
    font-size: 15px;
  }
  .method-walkthrough-footer {
    flex-direction: column;
    gap: 20px;
  }
  .method-step-controls {
    width: 100%;
  }
  .method-step-controls button {
    flex: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .method-flow {
    transition: none;
  }
}

@keyframes method-ice {
  0%,
  100% {
    transform: rotate(-10deg) scale(0.95);
  }
  50% {
    transform: rotate(18deg) scale(1.06);
  }
}
@keyframes method-ood-density {
  from {
    transform: translateX(22px) scaleX(1.07);
  }
  to {
    transform: translateX(-10px) scaleX(0.92);
  }
}
@keyframes method-id-density {
  from {
    transform: translateX(-22px) scaleX(1.07);
  }
  to {
    transform: translateX(10px) scaleX(0.92);
  }
}
@keyframes method-bank-density {
  from {
    transform: scaleY(0.85) scaleX(0.95);
  }
  to {
    transform: scaleY(1.08) scaleX(1.02);
  }
}
.method-walkthrough figcaption {
  margin-top: 20px;
}

/* A dashed magnification guide is structural, never an animated data-flow edge. */
.method-zoom-guide {
  fill: none;
  stroke: #718078;
  stroke-width: 1.5;
  stroke-dasharray: 8 7;
  pointer-events: none;
}
.method-choice {
  stroke-dasharray: 8 7;
}
.method-svg-part[data-method-part="router"] > .method-region {
  stroke: transparent;
}
.method-svg-part.is-selected > .method-router-block {
  stroke: #087365;
  stroke-width: 2.5;
}
.method-svg-part.is-selected > .method-router-detail-frame,
.method-svg-part.is-selected > .method-zoom-guide {
  stroke: #087365;
}
.method-inset-brand {
  font-weight: 600;
}
.method-svg-part[data-method-part="router"]:focus-visible > .method-router-block,
.method-svg-part[data-method-part="router"]:focus-visible > .method-router-detail-frame {
  stroke: #ae4a16;
  stroke-width: 3;
}
.method-vector .method-inset-brand {
  fill: #1e7186;
}