/* Project case: story layout, architecture diagram */

.people-list,
.issue-list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: 920px;
}

.people-list li,
.issue-list li {
  padding: 28px 0;
  border-top: var(--stroke) solid var(--line);
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 24px;
  align-items: baseline;
}

.people-list li:last-child,
.issue-list li:last-child {
  border-bottom: var(--stroke) solid var(--line);
}

.people-list b,
.issue-list b {
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 500;
}

.people-list h3,
.issue-list h3 {
  margin: 0 0 8px;
  font-size: var(--fs-24);
  font-weight: 600;
  letter-spacing: -0.03em;
}

.people-list p,
.issue-list p {
  margin: 0;
  color: var(--muted);
  font-size: var(--fs-17);
}

.subhead {
  margin: 0 0 12px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.chain {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 18px;
  align-items: stretch;
  margin-top: 12px;
}

.chain-node {
  padding: 8px 0 4px;
  border-top: 2px solid var(--accent);
}

.chain-node span {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 14px;
}

.chain-node h3 {
  margin: 0 0 12px;
  font-size: var(--fs-24);
  font-weight: 600;
  letter-spacing: -0.03em;
}

.chain-node p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.chain-rule {
  width: 28px;
  align-self: center;
  height: 1px;
  background: var(--line);
}

.principles {
  list-style: none;
  margin: 48px 0 0;
  padding: 28px 0 0;
  border-top: var(--stroke) solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px;
}

.principles li {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.6;
}

.loop-layout {
  display: grid;
  grid-template-columns: 0.95fr 1.15fr;
  gap: 40px;
  align-items: start;
}

.loop-steps {
  display: grid;
  gap: 8px;
}

.loop-step {
  background: transparent;
  color: var(--muted);
  border: var(--stroke) solid var(--line);
  text-align: left;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 18px;
  border-radius: var(--radius);
}

.loop-step b {
  font-size: var(--fs-12);
  font-weight: 400;
  letter-spacing: 0.12em;
  min-width: 1.8em;
}

.loop-step strong {
  font-size: var(--fs-17);
  font-weight: 500;
}

.loop-step[aria-selected="true"] {
  color: var(--text);
  background: var(--panel);
  border-color: var(--accent);
}

.loop-return {
  font-size: 13px;
  text-align: center;
  padding: 18px 4px 8px;
  color: var(--accent);
}

.loop-keys {
  font-size: var(--fs-12);
  color: var(--muted);
  text-align: center;
  margin: 0;
}

.loop-panel {
  border: var(--stroke) solid var(--line);
  padding: 32px;
  background: var(--panel);
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  border-radius: var(--radius);
  position: relative;
}

.loop-panel-mark {
  position: absolute;
  right: 28px;
  top: 28px;
  width: 64px;
  height: 64px;
  border: var(--stroke) solid var(--line);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: var(--fs-17);
  letter-spacing: 0.08em;
  color: var(--accent);
}

.loop-panel h3 {
  font-size: 28px;
  font-weight: 600;
  margin: 10px 0 14px;
  letter-spacing: -0.03em;
  padding-right: 84px;
}

.loop-panel .copy {
  color: var(--muted);
  font-size: var(--fs-17);
  margin: 0;
  max-width: 38em;
}

.quote {
  border-left: 2px solid var(--accent);
  padding-left: 18px;
  margin: 28px 0 0;
  font-size: 20px;
  line-height: 1.7;
}

.loop-seen {
  border-top: var(--stroke) solid var(--line);
  padding-top: 16px;
  margin-top: 28px;
  font-size: 13px;
  color: var(--accent);
}

.loop-controls {
  display: flex;
  gap: 12px;
  margin-top: 18px;
  justify-content: center;
}

.loop-controls button {
  background: transparent;
  border: var(--stroke) solid var(--line);
  color: var(--text);
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 13px;
}

.loop-controls button:hover {
  border-color: var(--accent);
}

.tiny-path {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.nested-title {
  margin: 48px 0 18px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.03em;
}

.directions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 28px;
  max-width: 1000px;
}

.directions li {
  margin: 0;
  padding: 8px 0 0;
  border-top: 2px solid var(--accent);
}

.directions h3 {
  margin: 16px 0 10px;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.directions p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.model-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  margin-top: 48px;
  padding-top: 28px;
  border-top: var(--stroke) solid var(--line);
  max-width: 1000px;
}

.model-split h3 {
  margin: 0 0 12px;
  font-size: 18px;
  font-weight: 600;
}

.model-split p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.page-project .closing h2 {
  max-width: 18em;
}

/* Layered architecture */

.sys-figure {
  margin: 0;
  max-width: 1120px;
}

.sys {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 28px;
  padding: 8px 32px 12px;
}

.sys-wires {
  position: absolute;
  left: 0;
  top: 0;
  display: block;
  pointer-events: none;
  overflow: visible;
  z-index: 0;
}

.sys-layer {
  position: relative;
  z-index: 1;
}

.sys-layer-label {
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 8px;
  font-weight: 500;
}

.sys-human {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sys-human .sys-layer-label {
  align-self: stretch;
}

.sys-human .sys-node {
  width: min(100%, 360px);
}

.sys-node {
  position: relative;
  min-width: 0;
  background: var(--panel);
  border: var(--stroke) solid var(--line);
  border-radius: var(--radius);
  padding: 16px 16px 14px;
}

.sys-hub {
  border-top: 2px solid var(--accent);
}

.sys-kicker {
  display: block;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 8px;
  font-weight: 500;
}

.sys-node h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
  color: var(--text);
}

.sys-node p {
  margin: 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.55;
}

.sys-tag {
  display: inline-block;
  margin-top: 8px;
  font-size: var(--fs-12);
  color: var(--accent);
  border: var(--stroke) solid var(--line);
  padding: 2px 8px;
  border-radius: 999px;
  line-height: 1.4;
}

.sys-roles {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
  align-items: stretch;
}

.sys-foundation-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr 1fr;
  gap: 28px;
  align-items: stretch;
}

.sys-legend {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: var(--fs-12);
  color: var(--muted);
}

.sys-legend i {
  display: inline-block;
  width: 28px;
  height: 0;
  margin-right: 8px;
  vertical-align: middle;
  border-top: 1.5px solid var(--accent);
}

.sys-legend .lg-fb {
  border-top-style: dashed;
}

.sys-legend .lg-state {
  border-top: 1.5px dotted #7d8f86;
}

.sys-flow {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  color: var(--muted);
  line-height: 1.7;
  max-width: 52em;
}

.sys-figure figcaption {
  margin-top: 14px;
  font-size: 13px;
  color: var(--muted);
}

@media (max-width: 1080px) {
  .chain,
  .principles,
  .loop-layout,
  .directions,
  .model-split {
    grid-template-columns: 1fr;
  }

  .chain-rule {
    width: 1px;
    height: 24px;
    justify-self: start;
    margin-left: 0;
  }

  .people-list li,
  .issue-list li {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (max-width: 1100px) {
  .sys {
    gap: 16px;
    padding: 4px 32px 8px;
  }

  .sys-human .sys-node {
    width: 100%;
  }

  .sys-roles,
  .sys-foundation-grid {
    grid-template-columns: 1fr;
  }

  .sys-roles {
    padding-bottom: 20px;
  }

  .sys-node h3 {
    font-size: var(--fs-17);
  }

  .sys-node p {
    font-size: var(--fs-14);
  }
}

@media (max-width: 700px) {
  .people-list li {
    grid-template-columns: 1fr;
  }

  .loop-panel {
    min-height: 0;
    padding: 24px;
  }

  .loop-panel-mark {
    width: 52px;
    height: 52px;
    font-size: var(--fs-14);
    right: 18px;
    top: 18px;
  }

  .loop-panel h3 {
    font-size: var(--fs-24);
    padding-right: 64px;
  }

  .quote {
    font-size: 18px;
  }

  .loop-controls {
    flex-direction: column;
  }

  .sys {
    padding: 4px 32px 8px;
  }
}