/* Screenshot revision: remove the top chrome, turn summary cards into rows,
   and scale the existing typography without changing its hierarchy. */
@media screen {
  html,
  .chapters {
    scroll-padding-top: 0;
  }

  #main {
    height: 100svh;
  }
}

/* English labels need more horizontal room than the Chinese equivalents. */
html[lang="en"] .demo-tab {
  min-height: 68px;
}

html[lang="en"] .demo-tab b {
  overflow: visible;
  white-space: normal;
  text-overflow: clip;
  line-height: 1.18;
}

html[lang="en"] .project-sidebar .summary {
  display: none;
}

@media (min-width: 1041px) {
  html[lang="en"] .project-sidebar .hero h1 {
    font-size: 40px;
    letter-spacing: -0.035em;
  }

  html[lang="en"] .toc-list {
    width: max(100%, 780px);
    grid-template-columns: repeat(6, minmax(112px, 1fr));
    gap: 6px;
    padding-right: 116px;
  }

  html[lang="en"] .toc a {
    padding-inline: 9px;
    font-size: 11px;
  }
}

@media (max-width: 900px) {
  html[lang="en"] .demo-switcher {
    grid-template-columns: repeat(7, minmax(138px, 1fr));
  }
}

/* July 23 content-system revision:
   pain/problem states use muted brick red; solution and system states use
   HUANG Director green with amber wayfinding. */

.audience-callout {
  position: relative;
  display: grid;
  grid-template-columns: minmax(240px, 0.42fr) minmax(0, 1fr);
  gap: 30px;
  align-items: center;
  padding: 20px 0;
  border: 0;
  border-top: 1px solid rgba(26, 44, 38, 0.24);
  border-bottom: 1px solid rgba(26, 44, 38, 0.24);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.audience-callout b {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.45;
}

.audience-callout b::before {
  display: block;
  margin-bottom: 8px;
  color: var(--accent-dark);
  content: "TARGET USER / 目标画像";
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.audience-callout p {
  margin: 0;
  padding-left: 28px;
  border-left: 3px solid var(--sage);
  color: rgba(26, 44, 38, 0.74);
  font-size: 18px;
  line-height: 1.65;
}

.pain-section .subsection-head::before {
  background: #ad6255;
}

.pain-section .subsection-head h3 {
  color: #7b3e35;
}

.pain-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  counter-reset: pain;
}

.pain {
  position: relative;
  min-height: 174px;
  padding: 20px 20px 18px 24px;
  overflow: hidden;
  border: 1px solid rgba(160, 82, 69, 0.24);
  border-left: 4px solid #ad6255;
  border-radius: 6px;
  background:
    linear-gradient(140deg, rgba(173, 98, 85, 0.11), rgba(173, 98, 85, 0.03)),
    rgba(248, 239, 223, 0.72);
  box-shadow: none;
  counter-increment: pain;
}

.pain::before {
  display: block;
  margin-bottom: 18px;
  color: #9a574b;
  content: "PAIN " counter(pain, decimal-leading-zero);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.13em;
}

.pain h4 {
  margin: 0 0 8px;
  color: #60352f;
  font-size: 18px;
}

.pain p {
  margin: 0;
  color: rgba(96, 53, 47, 0.72);
  font-size: 14px;
  line-height: 1.65;
}

.pain-conclusion {
  border-color: #7b3e35;
  border-left-color: var(--accent);
  color: var(--canvas);
  background: #7b3e35;
}

.pain-conclusion::before,
.pain-conclusion h4 {
  color: var(--canvas);
}

.pain-conclusion p {
  color: rgba(244, 232, 212, 0.82);
}

.workflow-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(158px, 1fr));
  gap: 0;
  overflow-x: auto;
  border-top: 1px solid rgba(26, 44, 38, 0.24);
  border-bottom: 1px solid rgba(26, 44, 38, 0.24);
  background: rgba(248, 239, 223, 0.3);
  scrollbar-width: thin;
}

.workflow-step {
  position: relative;
  min-height: 198px;
  padding: 22px 20px 20px;
  border: 0;
  border-right: 1px solid rgba(26, 44, 38, 0.14);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.workflow-step:last-child {
  border-right: 0;
}

.workflow-step:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 26px;
  right: -10px;
  display: grid;
  width: 20px;
  height: 20px;
  border: 1px solid rgba(26, 44, 38, 0.2);
  border-radius: 50%;
  color: var(--accent-dark);
  background: var(--surface);
  content: "›";
  font-size: 15px;
  font-weight: 800;
  line-height: 1;
  place-items: center;
}

.workflow-step small {
  display: grid;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--canvas);
  background: var(--sage);
  font-size: 10px;
  font-weight: 800;
  place-items: center;
}

.workflow-step h4 {
  margin: 18px 0 8px;
  color: var(--ink);
  font-size: 17px;
}

.workflow-step p {
  margin: 0;
  color: rgba(26, 44, 38, 0.62);
  font-size: 13px;
  line-height: 1.6;
}

.demo-switcher {
  --active-index: 0;
  position: relative;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0;
  padding: 5px;
  overflow: hidden;
  border-top: 1px solid var(--line);
  border-radius: 0 0 18px 18px;
  background: rgba(235, 216, 185, 0.62);
}

.demo-switcher::before {
  position: absolute;
  z-index: 0;
  top: 5px;
  bottom: 5px;
  left: 5px;
  width: calc((100% - 10px) / 7);
  border-radius: 10px;
  background: var(--sage);
  box-shadow: 0 8px 20px rgba(26, 44, 38, 0.16);
  content: "";
  transform: translateX(calc(var(--active-index) * 100%));
  transition: transform 240ms ease;
}

.demo-tab {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 7px;
  min-height: 54px;
  padding: 8px 9px;
  border: 0;
  border-radius: 10px;
  color: rgba(26, 44, 38, 0.62);
  background: transparent;
  cursor: pointer;
  text-align: left;
  transition: color 180ms ease;
}

.demo-tab span {
  display: grid;
  width: 24px;
  height: 24px;
  align-self: center;
  border: 1px solid currentcolor;
  border-radius: 50%;
  font-size: 9px;
  place-items: center;
}

.demo-tab b {
  overflow: hidden;
  align-self: center;
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.demo-tab small {
  display: none;
}

.demo-tab:hover {
  color: var(--ink);
  background: transparent;
}

.demo-tab.active {
  color: var(--canvas);
  background: transparent;
}

.demo-tab.active span {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--accent);
}

.knowledge {
  overflow: hidden;
  border: 1px solid rgba(26, 44, 38, 0.2);
  border-radius: 20px;
  background: rgba(248, 239, 223, 0.68);
  box-shadow: 0 24px 60px rgba(26, 44, 38, 0.1);
}

.knowledge-head {
  padding: 30px 32px 24px;
  border: 0;
  background:
    linear-gradient(90deg, rgba(198, 138, 74, 0.13), transparent 62%),
    rgba(248, 239, 223, 0.72);
}

.knowledge-head .subsection-head::before {
  background: var(--accent);
}

.knowledge-head p {
  max-width: 920px;
  margin: 0;
  color: rgba(26, 44, 38, 0.68);
  font-size: 15px;
  line-height: 1.7;
}

.comparison {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  padding: 0 32px 28px;
  background: transparent;
}

.comparison::after {
  position: absolute;
  z-index: 3;
  top: 50%;
  left: 50%;
  display: grid;
  width: 38px;
  height: 38px;
  border: 5px solid var(--surface);
  border-radius: 50%;
  color: var(--canvas);
  background: var(--accent-dark);
  content: "→";
  font-size: 16px;
  font-weight: 800;
  place-items: center;
  transform: translate(-50%, -50%);
}

.compare {
  min-height: 210px;
  padding: 24px 26px;
  border: 1px solid rgba(154, 87, 75, 0.32);
  border-top: 4px solid #ad6255;
  border-radius: 10px;
  color: #60352f;
  background:
    linear-gradient(145deg, rgba(173, 98, 85, 0.15), rgba(173, 98, 85, 0.04)),
    rgba(248, 239, 223, 0.76);
}

.compare.accent {
  border-color: var(--sage);
  border-top-color: var(--accent);
  color: var(--canvas);
  background: var(--sage);
  box-shadow: 0 14px 30px rgba(26, 44, 38, 0.16);
}

.compare small {
  color: #985348;
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.14em;
}

.compare.accent small {
  color: var(--accent);
}

.compare h4 {
  margin: 14px 0 10px;
  color: inherit;
  font-size: 21px;
}

.compare p {
  margin: 0;
  color: rgba(96, 53, 47, 0.74);
  font-size: 14px;
  line-height: 1.65;
}

.compare.accent p {
  color: rgba(244, 232, 212, 0.82);
}

.knowledge-body {
  padding: 30px 32px 32px;
  border-top: 1px solid rgba(26, 44, 38, 0.14);
  background: rgba(235, 216, 185, 0.34);
}

.knowledge-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  counter-reset: knowledge-stage;
}

.knowledge-node {
  position: relative;
  min-height: 142px;
  padding: 19px 17px;
  border: 0;
  border-top: 2px solid var(--sage);
  border-right: 1px solid rgba(26, 44, 38, 0.14);
  border-radius: 0;
  background: rgba(248, 239, 223, 0.72);
  counter-increment: knowledge-stage;
}

.knowledge-node:first-child {
  border-radius: 10px 0 0 10px;
}

.knowledge-node:last-child {
  border-right: 0;
  border-radius: 0 10px 10px 0;
}

.knowledge-node::before {
  display: block;
  margin-bottom: 12px;
  color: var(--accent-dark);
  content: "0" counter(knowledge-stage);
  font-size: 10px;
  font-weight: 850;
  letter-spacing: 0.1em;
}

.knowledge-node:not(:last-child)::after {
  position: absolute;
  z-index: 2;
  top: 23px;
  right: -9px;
  display: grid;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: var(--canvas);
  background: var(--sage);
  content: "›";
  font-size: 12px;
  place-items: center;
  transform: none;
}

.knowledge-node b {
  display: block;
  margin-bottom: 7px;
  color: var(--ink);
  font-size: 13px;
}

.knowledge-node span {
  color: rgba(26, 44, 38, 0.62);
  font-size: 11px;
  line-height: 1.55;
}

.knowledge-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 16px;
}

.knowledge-stat {
  padding: 18px 20px;
  border: 1px solid rgba(26, 44, 38, 0.13);
  border-radius: 10px;
  background: rgba(248, 239, 223, 0.8);
}

.knowledge-stat strong {
  display: block;
  color: var(--sage);
  font-family: var(--sans);
  font-size: 28px;
  font-weight: 850;
  letter-spacing: -0.04em;
}

.knowledge-stat span {
  color: rgba(26, 44, 38, 0.58);
  font-size: 11px;
}

.technology-chapter .architecture {
  position: relative;
  display: grid;
  gap: 0;
  overflow: hidden;
  border: 1px solid rgba(26, 44, 38, 0.22);
  border-radius: 18px;
  background: rgba(248, 239, 223, 0.68);
  box-shadow: 0 20px 50px rgba(26, 44, 38, 0.08);
}

.technology-chapter .architecture::before {
  position: absolute;
  z-index: 1;
  top: 32px;
  bottom: 32px;
  left: 41px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--sage));
  content: "";
}

.technology-chapter .architecture-row {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 52px minmax(190px, 0.34fr) minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  min-height: 76px;
  padding: 15px 22px 15px 15px;
  border: 0;
  border-bottom: 1px solid rgba(26, 44, 38, 0.12);
  border-radius: 0;
  background: rgba(248, 239, 223, 0.78);
}

.technology-chapter .architecture-row:nth-child(even) {
  background: rgba(220, 226, 217, 0.45);
}

.technology-chapter .architecture-row:last-child {
  border-bottom: 0;
}

.technology-chapter .architecture-row span:first-child {
  display: grid;
  width: 38px;
  height: 38px;
  border: 4px solid var(--surface);
  border-radius: 50%;
  color: var(--canvas);
  background: var(--sage);
  font-size: 10px;
  font-weight: 850;
  place-items: center;
}

.technology-chapter .architecture-row b {
  color: var(--ink);
  font-size: 15px;
}

.technology-chapter .architecture-row p {
  margin: 0;
  color: rgba(26, 44, 38, 0.62);
  font-size: 13px;
  line-height: 1.58;
}

.technology-chapter .stack-groups {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  counter-reset: stack-layer;
}

.technology-chapter .stack-group {
  position: relative;
  min-height: 188px;
  padding: 48px 20px 20px;
  overflow: hidden;
  border: 1px solid rgba(26, 44, 38, 0.17);
  border-top: 4px solid var(--sage);
  border-radius: 10px;
  background:
    linear-gradient(145deg, rgba(43, 74, 63, 0.1), transparent 62%),
    rgba(248, 239, 223, 0.76);
  counter-increment: stack-layer;
}

.technology-chapter .stack-group:nth-child(even) {
  border-top-color: var(--accent);
  background:
    linear-gradient(145deg, rgba(198, 138, 74, 0.13), transparent 62%),
    rgba(248, 239, 223, 0.76);
}

.technology-chapter .stack-group::before {
  position: absolute;
  top: 15px;
  left: 20px;
  color: var(--accent-dark);
  content: "STACK 0" counter(stack-layer);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.13em;
}

.technology-chapter .stack-group b {
  display: block;
  margin-bottom: 14px;
  color: var(--ink);
  font-size: 15px;
}

.technology-chapter .stack-pills {
  display: flex;
  align-content: flex-start;
  flex-wrap: wrap;
  gap: 6px;
}

.technology-chapter .stack-pills span {
  padding: 5px 8px;
  border: 1px solid rgba(26, 44, 38, 0.14);
  border-radius: 999px;
  color: rgba(26, 44, 38, 0.68);
  background: rgba(248, 239, 223, 0.76);
  font-size: 10px;
}

@media screen and (min-width: 1041px) {
  .audience-callout {
    padding: 22px 0;
    border-radius: 0;
    background: transparent;
  }

  .audience-callout b {
    color: var(--ink);
    font-size: 18px;
  }

  .audience-callout p {
    font-size: 18px;
  }

  .workflow-step small {
    font-size: 10px;
  }

  .workflow-step h4 {
    font-size: 17px;
  }

  .workflow-step p {
    font-size: 13px;
  }

  .demo-tab span {
    font-size: 9px;
  }

  .demo-tab b {
    font-size: 10px;
  }

  .compare small {
    font-size: 10px;
  }

  .compare h4 {
    font-size: 21px;
  }

  .compare p {
    font-size: 14px;
  }

  .knowledge-node b {
    font-size: 13px;
  }

  .knowledge-node span {
    font-size: 11px;
  }

  .knowledge-stat strong {
    font-size: 28px;
  }

  .knowledge-stat span {
    font-size: 11px;
  }

  .technology-chapter .architecture-row span:first-child {
    font-size: 10px;
  }

  .technology-chapter .architecture-row b {
    font-size: 15px;
  }

  .technology-chapter .architecture-row p {
    font-size: 13px;
  }

  .technology-chapter .stack-group b {
    font-size: 15px;
  }

  .technology-chapter .stack-pills span {
    font-size: 10px;
  }
}

/* July 23 refinement: simplify dense modules, stabilize the media area,
   and increase contrast for small explanatory copy. */

.workflow-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  overflow: visible;
}

.workflow-step {
  min-height: 188px;
  padding: 22px 18px 20px;
}

.workflow-step h4 {
  font-size: 17px;
  line-height: 1.35;
}

.workflow-step p {
  color: rgba(26, 44, 38, 0.72);
  font-size: 13px;
}

.demo-player {
  height: clamp(420px, 43vw, 560px);
  min-height: 0;
}

.demo-player video {
  height: 100%;
  min-height: 0;
  max-height: none;
  object-fit: contain;
}

.demo-switcher {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 0;
  padding: 0;
  overflow: hidden;
  border-top: 1px solid rgba(26, 44, 38, 0.2);
  border-radius: 0;
  background: rgba(248, 239, 223, 0.84);
}

.demo-switcher::before {
  display: none;
}

.demo-tab {
  position: relative;
  display: grid;
  grid-template-columns: 26px minmax(0, 1fr);
  gap: 8px;
  min-height: 62px;
  padding: 11px 12px;
  border: 0;
  border-right: 1px solid rgba(26, 44, 38, 0.12);
  border-radius: 0;
  color: rgba(26, 44, 38, 0.62);
  background: transparent;
}

.demo-tab:last-child {
  border-right: 0;
}

.demo-tab::after {
  position: absolute;
  right: 14px;
  bottom: 0;
  left: 14px;
  height: 3px;
  background: transparent;
  content: "";
}

.demo-tab span {
  width: 26px;
  height: 26px;
  border-color: rgba(26, 44, 38, 0.34);
  color: rgba(26, 44, 38, 0.72);
  background: transparent;
}

.demo-tab b {
  color: inherit;
  font-size: 11px;
  font-weight: 700;
}

.demo-tab:hover {
  color: var(--ink);
  background: rgba(198, 138, 74, 0.07);
}

.demo-tab.active {
  color: var(--ink);
  background: rgba(43, 74, 63, 0.07);
}

.demo-tab.active::after {
  background: var(--sage);
}

.demo-tab.active span {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--accent);
}

.knowledge {
  overflow: visible;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  backdrop-filter: none;
}

.knowledge-head {
  padding: 0 0 24px;
  border: 0;
  border-bottom: 1px solid rgba(26, 44, 38, 0.22);
  background: transparent;
}

.knowledge-head p {
  max-width: 980px;
  color: rgba(26, 44, 38, 0.78);
  font-size: 16px;
  line-height: 1.72;
}

.comparison {
  grid-template-columns: 1fr 1fr;
  gap: 0;
  padding: 28px 0 0;
  background: transparent;
}

.comparison::after {
  display: none;
}

.compare,
.compare.accent {
  min-height: 0;
  padding: 6px 34px 8px 24px;
  border: 0;
  border-left: 3px solid #ad6255;
  border-radius: 0;
  color: var(--ink);
  background: transparent;
  box-shadow: none;
}

.compare.accent {
  border-left-color: var(--sage);
}

.compare small,
.compare.accent small {
  color: #945047;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.13em;
}

.compare.accent small {
  color: var(--sage);
}

.compare h4,
.compare.accent h4 {
  margin: 12px 0 9px;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.35;
}

.compare p,
.compare.accent p {
  color: rgba(26, 44, 38, 0.74);
  font-size: 15px;
  line-height: 1.7;
}

.knowledge-body {
  padding: 30px 0 0;
  border: 0;
  background: transparent;
}

.knowledge-flow {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid rgba(26, 44, 38, 0.24);
  border-bottom: 1px solid rgba(26, 44, 38, 0.16);
}

.knowledge-node,
.knowledge-node:first-child,
.knowledge-node:last-child {
  min-height: 132px;
  padding: 18px 18px 20px;
  border: 0;
  border-right: 1px solid rgba(26, 44, 38, 0.14);
  border-radius: 0;
  background: transparent;
}

.knowledge-node:last-child {
  border-right: 0;
}

.knowledge-node::before {
  margin-bottom: 10px;
  color: var(--accent-dark);
  font-size: 11px;
}

.knowledge-node:not(:last-child)::after {
  display: none;
}

.knowledge-node b {
  color: var(--ink);
  font-size: 15px;
}

.knowledge-node span {
  color: rgba(26, 44, 38, 0.7);
  font-size: 13px;
  line-height: 1.65;
}

.knowledge-stats {
  gap: 0;
  margin-top: 24px;
  border-top: 1px solid rgba(26, 44, 38, 0.22);
  border-bottom: 1px solid rgba(26, 44, 38, 0.22);
}

.knowledge-stat {
  padding: 20px 24px;
  border: 0;
  border-right: 1px solid rgba(26, 44, 38, 0.16);
  border-radius: 0;
  background: transparent;
}

.knowledge-stat:last-child {
  border-right: 0;
}

.knowledge-stat strong {
  color: var(--ink);
  font-size: 31px;
}

.knowledge-stat span {
  color: rgba(26, 44, 38, 0.7);
  font-size: 13px;
  line-height: 1.5;
}

.technology-chapter .stack-groups {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid rgba(26, 44, 38, 0.25);
  border-bottom: 1px solid rgba(26, 44, 38, 0.25);
}

.technology-chapter .stack-group,
.technology-chapter .stack-group:nth-child(even) {
  display: grid;
  grid-template-columns: minmax(150px, 0.34fr) minmax(0, 1fr);
  gap: 24px;
  align-items: start;
  min-height: 0;
  padding: 24px 28px 24px 0;
  overflow: visible;
  border: 0;
  border-right: 1px solid rgba(26, 44, 38, 0.15);
  border-bottom: 1px solid rgba(26, 44, 38, 0.15);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.technology-chapter .stack-group:nth-child(even) {
  padding-right: 0;
  padding-left: 28px;
  border-right: 0;
}

.technology-chapter .stack-group:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.technology-chapter .stack-group::before {
  display: none;
}

.technology-chapter .stack-group b {
  margin: 2px 0 0;
  color: rgba(26, 44, 38, 0.65);
  font-size: 13px;
  font-weight: 750;
  letter-spacing: 0.04em;
}

.technology-chapter .stack-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 0;
}

.technology-chapter .stack-pills span {
  padding: 0;
  border: 0;
  border-radius: 0;
  color: var(--ink);
  background: transparent;
  font-size: 17px;
  font-weight: 750;
  line-height: 1.55;
}

.technology-chapter .stack-pills span:not(:last-child)::after {
  margin: 0 9px;
  color: var(--accent);
  content: "/";
  font-weight: 500;
}

@media screen and (min-width: 1041px) {
  .workflow-step h4 {
    font-size: 17px;
  }

  .workflow-step p {
    font-size: 13px;
  }

  .demo-tab span {
    font-size: 10px;
  }

  .demo-tab b {
    font-size: 11px;
  }

  .knowledge-head p {
    font-size: 16px;
  }

  .compare small {
    font-size: 11px;
  }

  .compare h4 {
    font-size: 22px;
  }

  .compare p {
    font-size: 15px;
  }

  .knowledge-node b {
    font-size: 15px;
  }

  .knowledge-node span,
  .knowledge-stat span {
    font-size: 13px;
  }

  .knowledge-stat strong {
    font-size: 31px;
  }

  .technology-chapter .stack-group b {
    font-size: 13px;
  }

  .technology-chapter .stack-pills span {
    font-size: 17px;
  }
}

/* Final media sizing and custom controls. */
.demo-player {
  height: auto;
  min-height: 0;
  align-items: stretch;
  background: transparent;
}

.demo-media {
  position: relative;
  min-width: 0;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--surface);
}

.demo-player video {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  max-height: none;
  object-fit: cover;
  background: transparent;
  cursor: pointer;
}

.demo-player .demo-video-backdrop {
  display: none;
}

html[lang="en"] .demo-video-backdrop {
  position: absolute;
  z-index: 1;
  inset: -8%;
  width: 116%;
  height: 116%;
  display: block;
  object-fit: cover;
  filter: blur(28px) saturate(1.08) brightness(0.66);
  opacity: 0.82;
  pointer-events: none;
  transform: scale(1.06);
}

html[lang="en"] #demoVideo {
  position: relative;
  z-index: 2;
  object-fit: contain;
}

.demo-caption {
  background: var(--deep);
}

.demo-controls {
  position: absolute;
  z-index: 4;
  right: 16px;
  bottom: 16px;
  left: 16px;
  display: grid;
  grid-template-columns: auto minmax(100px, 1fr) auto auto auto;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid rgba(26, 44, 38, 0.16);
  border-radius: 10px;
  color: var(--ink);
  background: rgba(248, 239, 223, 0.94);
  box-shadow: 0 8px 24px rgba(26, 44, 38, 0.14);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition:
    opacity 160ms ease,
    transform 160ms ease;
}

.demo-media:hover .demo-controls,
.demo-media:focus-within .demo-controls {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.demo-controls button {
  min-height: 30px;
  padding: 0 8px;
  border: 0;
  border-radius: 6px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font-size: 11px;
  font-weight: 750;
}

.demo-controls button:hover,
.demo-controls button:focus-visible {
  background: rgba(43, 74, 63, 0.1);
  outline: none;
}

.demo-controls input[type="range"] {
  width: 100%;
  height: 4px;
  margin: 0;
  border-radius: 999px;
  accent-color: var(--sage);
  cursor: pointer;
}

.demo-controls span {
  color: rgba(26, 44, 38, 0.66);
  font-size: 10px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.demo-media:fullscreen {
  display: grid;
  background: #0c0f0e;
  place-items: center;
}

.demo-media:fullscreen video {
  object-fit: contain;
}

html[lang="en"] .demo-media:fullscreen .demo-video-backdrop {
  object-fit: cover;
}

/* Ensure the comparison hierarchy remains stronger than the legacy desktop
   type scale above. */
.comparison {
  grid-template-columns: 1fr;
  gap: 18px;
  padding-top: 26px;
}

.compare {
  width: min(72%, 760px);
}

.compare small {
  font-size: 10px;
}

.compare h4 {
  font-size: 18px;
}

.compare p {
  font-size: 13px;
}

.compare.accent {
  width: 100%;
}

.compare.accent small {
  font-size: 11px;
}

.compare.accent h4 {
  font-size: 27px;
}

.compare.accent p {
  font-size: 16px;
}

@media screen and (max-width: 720px) {
  .demo-controls {
    right: 10px;
    bottom: 10px;
    left: 10px;
    grid-template-columns: auto minmax(80px, 1fr) auto;
    gap: 7px;
    padding: 8px;
  }

  .demo-controls span,
  #demoFullscreen {
    display: none;
  }

  .compare {
    width: 100%;
  }
}

/* Hierarchical comparison: the limited common approach is intentionally
   secondary; HUANG Director is the primary solution. */
.comparison {
  grid-template-columns: 1fr;
  gap: 18px;
  padding-top: 26px;
}

.compare {
  width: min(72%, 760px);
  min-height: 0;
  padding: 16px 20px;
  border-left: 3px solid #ad6255;
  background: rgba(173, 98, 85, 0.045);
}

.compare small {
  color: #945047;
  font-size: 10px;
}

.compare h4 {
  margin: 9px 0 6px;
  color: #6f4038;
  font-size: 18px;
}

.compare p {
  color: rgba(96, 53, 47, 0.7);
  font-size: 13px;
  line-height: 1.65;
}

.compare.accent {
  width: 100%;
  padding: 26px 30px;
  border: 1px solid rgba(43, 74, 63, 0.16);
  border-left: 5px solid var(--sage);
  border-radius: 8px;
  background:
    linear-gradient(100deg, rgba(43, 74, 63, 0.13), rgba(43, 74, 63, 0.035)),
    rgba(248, 239, 223, 0.5);
}

.compare.accent small {
  color: var(--sage);
  font-size: 11px;
}

.compare.accent h4 {
  margin: 11px 0 9px;
  color: var(--ink);
  font-size: 27px;
  line-height: 1.28;
}

.compare.accent p {
  max-width: 980px;
  color: rgba(26, 44, 38, 0.8);
  font-size: 16px;
  line-height: 1.7;
}

@media screen and (max-width: 720px) {
  .compare {
    width: 100%;
  }

  .compare.accent {
    margin-top: 0;
    padding: 22px 20px;
  }
}

@media screen and (max-width: 900px) {
  .workflow-grid {
    grid-template-columns: repeat(5, minmax(180px, 1fr));
    overflow-x: auto;
  }

  .demo-player {
    height: auto;
  }

  .demo-switcher {
    grid-template-columns: repeat(7, minmax(120px, 1fr));
    overflow-x: auto;
  }

  .technology-chapter .stack-groups {
    grid-template-columns: 1fr;
  }

  .technology-chapter .stack-group,
  .technology-chapter .stack-group:nth-child(even) {
    padding: 22px 0;
    border-right: 0;
    border-bottom: 1px solid rgba(26, 44, 38, 0.15);
  }

  .technology-chapter .stack-group:nth-last-child(-n + 2) {
    border-bottom: 1px solid rgba(26, 44, 38, 0.15);
  }

  .technology-chapter .stack-group:last-child {
    border-bottom: 0;
  }
}

@media screen and (max-width: 720px) {
  .comparison,
  .knowledge-stats {
    grid-template-columns: 1fr;
  }

  .compare,
  .compare.accent {
    padding: 8px 0 8px 20px;
  }

  .compare.accent {
    margin-top: 24px;
  }

  .knowledge-flow {
    grid-template-columns: 1fr;
  }

  .knowledge-node,
  .knowledge-node:first-child,
  .knowledge-node:last-child {
    border-right: 0;
    border-bottom: 1px solid rgba(26, 44, 38, 0.14);
  }

  .knowledge-stat {
    border-right: 0;
    border-bottom: 1px solid rgba(26, 44, 38, 0.14);
  }

  .technology-chapter .stack-group,
  .technology-chapter .stack-group:nth-child(even) {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media screen and (max-width: 900px) {
  .pain-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workflow-grid {
    grid-template-columns: repeat(6, minmax(190px, 1fr));
  }

  .demo-switcher {
    grid-template-columns: repeat(7, minmax(116px, 1fr));
    overflow-x: auto;
  }

  .demo-switcher::before {
    display: none;
  }

  .demo-tab.active {
    color: var(--canvas);
    background: var(--sage);
  }

  .technology-chapter .stack-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media screen and (max-width: 720px) {
  .audience-callout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .audience-callout p {
    padding-top: 14px;
    padding-left: 0;
    border-top: 3px solid var(--sage);
    border-left: 0;
  }

  .pain-grid,
  .comparison,
  .knowledge-stats,
  .technology-chapter .stack-groups {
    grid-template-columns: 1fr;
  }

  .comparison::after {
    top: 50%;
    content: "↓";
  }

  .knowledge-flow {
    grid-template-columns: 1fr;
  }

  .knowledge-node,
  .knowledge-node:first-child,
  .knowledge-node:last-child {
    border-right: 0;
    border-bottom: 1px solid rgba(26, 44, 38, 0.14);
    border-radius: 0;
  }

  .knowledge-node:not(:last-child)::after {
    display: none;
  }

  .technology-chapter .architecture::before {
    left: 34px;
  }

  .technology-chapter .architecture-row {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 12px;
  }

  .technology-chapter .architecture-row p {
    grid-column: 2;
  }
}

@media screen and (min-width: 1041px) {
  .case-layout {
    grid-template-rows: 76px minmax(0, 1fr);
    align-items: stretch;
    gap: 0;
  }

  .toc {
    padding: 14px 22px;
    border-bottom: 0;
  }

  .toc-list {
    grid-template-columns: repeat(6, minmax(130px, 1fr));
    width: max(100%, 860px);
    gap: 8px;
  }

  .toc a {
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 9px;
    padding: 8px 11px 8px 7px;
    font-size: 12px;
    font-weight: 750;
  }

  .toc a span:first-child {
    width: 32px;
    height: 32px;
    font-size: 10px;
  }

  .hero {
    padding: 30px 28px 14px;
  }

  .eyebrow {
    font-size: 11px;
  }

  .eyebrow::before {
    width: 7px;
    height: 7px;
  }

  .hero h1 {
    margin: 16px 0 12px;
    font-size: clamp(38px, 3.3vw, 52px);
    line-height: 0.96;
  }

  .hero h1 span {
    margin-top: 10px;
    font-size: 0.42em;
    line-height: 1.12;
  }

  .hero-copy {
    font-size: 14px;
    line-height: 1.62;
    -webkit-line-clamp: 5;
  }

  .hero-actions {
    margin-top: 18px;
  }

  .project-sidebar .button {
    min-height: 46px;
    padding-inline: 21px;
    font-size: 12px;
  }

  .hero-meta {
    gap: 9px 20px;
    margin-top: 19px;
    color: rgba(26, 44, 38, 0.78);
    font-size: 13px;
    font-weight: 600;
    line-height: 1.6;
  }

  .hero-meta b {
    color: var(--ink);
    font-weight: 800;
  }

  .product-frame {
    margin-top: 28px;
  }

  .frame-bar {
    height: 36px;
    padding-inline: 14px;
    font-size: 10px;
  }

  .summary {
    padding: 25px 28px 22px;
  }

  .summary-grid {
    display: grid;
    grid-template-columns: 1fr;
    overflow: visible;
    border: 0;
    border-top: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    backdrop-filter: none;
  }

  .summary-item,
  .summary-item:nth-child(2),
  .summary-item:nth-child(-n + 2) {
    display: grid;
    grid-template-columns: 112px minmax(0, 1fr);
    gap: 16px;
    align-items: center;
    min-width: 0;
    padding: 12px 0;
    border-right: 0;
    border-bottom: 1px solid rgba(26, 44, 38, 0.13);
  }

  .summary-item:last-child {
    border-bottom: 0;
  }

  .summary-item strong,
  .summary-item span {
    margin-top: 0;
    color: var(--ink);
    font-family: var(--sans);
    font-size: 15px;
    font-weight: 750;
    letter-spacing: -0.015em;
    line-height: 1.4;
  }

  .chapter {
    font-size: 15px;
    line-height: 1.68;
  }

  .chapter,
  .chapter:first-child {
    padding-top: 14px;
  }

  .chapter-head {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 20px;
    margin-bottom: 36px;
  }

  .chapter-number {
    width: 52px;
    height: 34px;
    font-size: 11px;
  }

  .chapter h2 {
    font-size: clamp(48px, 4.7vw, 68px);
  }

  .chapter-intro {
    max-width: 900px;
    margin-top: 13px;
    font-size: 16px;
    line-height: 1.65;
  }

  .subsection {
    margin-top: 40px;
  }

  .subsection-head {
    margin-bottom: 23px;
  }

  .subsection h3 {
    font-size: 22px;
  }

  .facts {
    grid-template-columns: 1.15fr 0.9fr 0.85fr;
    grid-template-areas:
      "name version role"
      "subtitle time live";
    gap: 24px 44px;
    overflow: visible;
    padding: 5px 0 9px;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
    backdrop-filter: none;
  }

  .fact {
    display: block;
    padding: 0;
    border: 0;
  }

  .fact:nth-child(1) {
    grid-area: name;
  }

  .fact:nth-child(2) {
    grid-area: subtitle;
  }

  .fact:nth-child(3) {
    grid-area: version;
  }

  .fact:nth-child(4) {
    grid-area: time;
  }

  .fact:nth-child(5) {
    grid-area: role;
  }

  .fact:nth-child(6) {
    grid-area: live;
  }

  .fact dt {
    margin-bottom: 5px;
    color: rgba(26, 44, 38, 0.56);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.06em;
  }

  .fact dd {
    font-size: 17px;
    line-height: 1.48;
  }

  .note {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 20px;
    margin-top: 22px;
    padding: 15px 20px;
    border-left-width: 1px;
    background: rgba(198, 138, 74, 0.08);
  }

  .note b,
  .note p {
    font-size: 15px;
    line-height: 1.65;
  }

  #project > #ui-overview {
    margin-top: 64px;
  }

  .responsibility small {
    font-size: 11px;
  }

  .responsibility h3 {
    font-size: 18px;
  }

  .responsibility p {
    font-size: 15px;
    line-height: 1.65;
  }

  .audience-callout {
    display: grid;
    grid-template-columns: minmax(210px, 0.36fr) minmax(0, 1fr);
    gap: 28px;
    align-items: center;
    padding: 22px 26px;
    border: 1px solid rgba(43, 74, 63, 0.18);
    border-left: 4px solid var(--sage);
    border-radius: 10px;
    background: linear-gradient(
      100deg,
      rgba(43, 74, 63, 0.12) 0 35%,
      rgba(198, 138, 74, 0.06) 35% 100%
    );
    box-shadow: none;
  }

  .audience-callout b {
    margin: 0;
    color: var(--sage);
    font-size: 14px;
    line-height: 1.55;
  }

  .audience-callout p {
    margin: 0;
    font-size: 19px;
    line-height: 1.65;
  }

  .friction-section .subsection-head::before {
    background: #a75c4c;
  }

  .friction-section .subsection-head h3 {
    color: #7c4035;
  }

  .numbered-list {
    position: relative;
    gap: 0;
    padding: 7px 0 7px 34px;
    border-left: 2px solid rgba(167, 92, 76, 0.5);
    background: linear-gradient(
      90deg,
      rgba(167, 92, 76, 0.08),
      rgba(167, 92, 76, 0) 64%
    );
  }

  .numbered-list::before,
  .numbered-list::after {
    position: absolute;
    left: -5px;
    width: 8px;
    height: 8px;
    border: 2px solid var(--surface);
    border-radius: 50%;
    background: #a75c4c;
    content: "";
  }

  .numbered-list::before {
    top: 0;
  }

  .numbered-list::after {
    bottom: 0;
  }

  .numbered-item {
    position: relative;
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 16px;
    align-items: center;
    padding: 16px 18px;
    border: 0;
    border-bottom: 1px dashed rgba(124, 64, 53, 0.24);
    border-radius: 0;
    background: transparent;
  }

  .numbered-item:last-child {
    border-bottom: 0;
  }

  .numbered-item::after {
    position: absolute;
    top: 50%;
    left: -34px;
    width: 20px;
    height: 1px;
    background: rgba(167, 92, 76, 0.42);
    content: "";
  }

  .numbered-item::before {
    width: 34px;
    height: 34px;
    border: 1px solid rgba(167, 92, 76, 0.34);
    color: #7c4035;
    background: #f0d7c8;
    font-size: 11px;
  }

  .numbered-item p {
    margin: 0;
    color: rgba(92, 78, 70, 0.9);
    font-size: 15px;
    line-height: 1.65;
  }

  .pain h4 {
    font-size: 18px;
  }

  .pain p {
    font-size: 15px;
    line-height: 1.65;
  }

  .signal strong {
    font-size: 31px;
  }

  .signal span {
    font-size: 14px;
    line-height: 1.55;
  }

  .workflow-step small {
    font-size: 12px;
  }

  .workflow-step h4 {
    font-size: 18px;
  }

  .workflow-step p {
    font-size: 14px;
    line-height: 1.62;
  }

  .workspace-copy small {
    font-size: 11px;
  }

  .workspace-copy h4 {
    font-size: 26px;
  }

  .workspace-copy p {
    font-size: 15px;
    line-height: 1.65;
  }

  .tag {
    font-size: 12px;
  }

  .knowledge-head p {
    max-width: 900px;
    font-size: 16px;
    line-height: 1.65;
  }

  .compare small {
    font-size: 11px;
  }

  .compare h4 {
    font-size: 21px;
  }

  .compare p {
    font-size: 15px;
    line-height: 1.62;
  }

  .knowledge-node b {
    font-size: 13px;
  }

  .knowledge-node span {
    font-size: 12px;
    line-height: 1.55;
  }

  .knowledge-stat strong {
    font-size: 27px;
  }

  .knowledge-stat span {
    font-size: 12px;
  }

  .decision b {
    font-size: 16px;
  }

  .decision p {
    font-size: 14px;
    line-height: 1.62;
  }

  .architecture-row span:first-child {
    font-size: 11px;
  }

  .architecture-row b {
    font-size: 15px;
  }

  .architecture-row p {
    font-size: 14px;
    line-height: 1.6;
  }

  .stack-group b {
    font-size: 15px;
  }

  .stack-pills span {
    font-size: 12px;
  }

  .result strong {
    font-size: 32px;
  }

  .result b {
    font-size: 14px;
  }

  .result span {
    font-size: 12px;
    line-height: 1.5;
  }

  .iteration b,
  .iteration p {
    font-size: 14px;
    line-height: 1.58;
  }

  .audit strong {
    font-size: 29px;
  }

  .audit b {
    font-size: 14px;
  }

  .audit span {
    font-size: 12px;
  }

  .method-note {
    font-size: 13px;
    line-height: 1.62;
  }

  .media-intro {
    max-width: 900px;
    font-size: 14px;
    line-height: 1.62;
  }

  .demo-caption small,
  .ui-gallery-copy small {
    font-size: 11px;
  }

  .demo-caption h4 {
    font-size: 27px;
  }

  .ui-gallery-copy h4 {
    font-size: 25px;
  }

  .demo-caption p,
  .ui-gallery-copy p {
    font-size: 15px;
    line-height: 1.65;
  }

  .demo-caption span {
    font-size: 11px;
  }

  .demo-tab span {
    font-size: 10px;
  }

  .demo-tab b {
    font-size: 12px;
  }

  .demo-tab small {
    font-size: 10px;
  }

  .ui-thumb span {
    font-size: 10px;
  }
}

/* Keep the editorial target-user treatment after the legacy desktop scale
   rules above. */
@media screen and (min-width: 1041px) {
  .audience-callout {
    grid-template-columns: minmax(240px, 0.42fr) minmax(0, 1fr);
    gap: 30px;
    padding: 22px 0;
    border: 0;
    border-top: 1px solid rgba(26, 44, 38, 0.24);
    border-bottom: 1px solid rgba(26, 44, 38, 0.24);
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .audience-callout b {
    margin: 0;
    color: var(--ink);
    font-size: 18px;
    line-height: 1.45;
  }

  .audience-callout p {
    margin: 0;
    padding-left: 28px;
    border-left: 3px solid var(--sage);
    font-size: 18px;
    line-height: 1.65;
  }

  .workflow-step h4 {
    font-size: 17px;
  }

  .workflow-step p {
    font-size: 13px;
  }

  .demo-tab b {
    font-size: 11px;
  }

  .knowledge-head p {
    font-size: 16px;
  }

  .compare small {
    font-size: 11px;
  }

  .compare h4 {
    font-size: 22px;
  }

  .compare p {
    font-size: 15px;
  }

  .knowledge-node b {
    font-size: 15px;
  }

  .knowledge-node span,
  .knowledge-stat span {
    font-size: 13px;
  }

  .knowledge-stat strong {
    font-size: 31px;
  }

  .technology-chapter .stack-group b {
    font-size: 13px;
  }

  .technology-chapter .stack-pills span {
    font-size: 17px;
  }

  .compare:not(.accent) small {
    font-size: 10px;
  }

  .compare:not(.accent) h4 {
    font-size: 18px;
  }

  .compare:not(.accent) p {
    font-size: 12px;
  }

  .compare:not(.accent) {
    width: min(56%, 620px);
    padding: 11px 15px 12px;
    border-left-width: 2px;
  }

  .compare:not(.accent) small {
    font-size: 9px;
  }

  .compare:not(.accent) h4 {
    margin: 7px 0 5px;
    font-size: 16px;
  }

  .demo-stage,
  .demo-player,
  .demo-media,
  .demo-switcher {
    overflow-anchor: none;
  }
}