:root {
  --navy-950: #08131f;
  --navy-900: #0b1726;
  --navy-800: #142842;
  --ink: #1d2f45;
  --muted: #68778a;
  --paper: #f4f1e9;
  --paper-bright: #fbfaf6;
  --line: rgba(29, 47, 69, 0.14);
  --line-dark: rgba(255, 255, 255, 0.16);
  --blue: #337db9;
  --blue-light: #74b4e5;
  --coral: #f46850;
  --gold: #d8a02e;
  --teal: #3fa189;
  --shadow: 0 28px 90px rgba(8, 19, 31, 0.14);
  --content: 1360px;
  --pad-x: clamp(24px, 6vw, 104px);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-snap-type: y proximity;
  background: var(--navy-950);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--navy-950);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}

button,
summary {
  font: inherit;
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  transform: translateY(-150%);
  padding: 10px 16px;
  border-radius: 999px;
  color: white;
  background: var(--coral);
  text-decoration: none;
}

.skip-link:focus {
  transform: translateY(0);
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 120;
  height: 3px;
  background: rgba(255, 255, 255, 0.08);
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--coral), var(--gold));
  transition: width 180ms ease;
}

.topbar {
  position: fixed;
  z-index: 110;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 14px 28px;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(8, 19, 31, 0.74);
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: inherit;
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  color: var(--navy-950);
  background: var(--coral);
  font-size: 11px;
  letter-spacing: 0.04em;
}

.topbar-actions,
.chapter-counter {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chapter-counter {
  color: rgba(255, 255, 255, 0.56);
  font-variant-numeric: tabular-nums;
}

.chapter-counter strong {
  color: white;
  font-size: 18px;
}

.index-trigger,
.dialog-head button,
.mobile-controls button {
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 999px;
  color: white;
  background: transparent;
  cursor: pointer;
  transition: 180ms ease;
}

.index-trigger {
  padding: 8px 16px;
}

.index-trigger:hover,
.index-trigger:focus-visible,
.dialog-head button:hover,
.mobile-controls button:hover {
  border-color: var(--coral);
  background: var(--coral);
  outline: none;
}

.side-rail {
  position: fixed;
  z-index: 100;
  top: 50%;
  left: 24px;
  transform: translateY(-50%);
}

.side-rail ol {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.side-rail a {
  position: relative;
  display: grid;
  place-items: center;
  width: 36px;
  height: 30px;
  color: rgba(255, 255, 255, 0.44);
  font-size: 10px;
  font-weight: 700;
  text-decoration: none;
  transition: 180ms ease;
}

.side-rail a::after {
  position: absolute;
  left: calc(100% + 10px);
  width: max-content;
  padding: 5px 9px;
  border-radius: 6px;
  color: white;
  background: rgba(8, 19, 31, 0.9);
  content: attr(data-label);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-5px);
  transition: 160ms ease;
}

.side-rail a:hover::after,
.side-rail a:focus-visible::after {
  opacity: 1;
  transform: translateX(0);
}

.side-rail a.active {
  color: var(--navy-950);
  background: var(--coral);
}

.chapter {
  position: relative;
  min-height: 100svh;
  scroll-margin-top: 0;
  scroll-snap-align: start;
  overflow: hidden;
}

.chapter.light {
  color: var(--ink);
  background:
    linear-gradient(rgba(29, 47, 69, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29, 47, 69, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
}

.chapter.dark {
  color: white;
  background:
    radial-gradient(circle at 88% 12%, rgba(51, 125, 185, 0.2), transparent 28%),
    radial-gradient(circle at 12% 88%, rgba(244, 104, 80, 0.12), transparent 30%),
    var(--navy-900);
}

.section-shell,
.cover-grid,
.metric-strip,
.cover-footnote {
  width: min(var(--content), calc(100% - (var(--pad-x) * 2)));
  margin-inline: auto;
}

.section-shell {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 100svh;
  padding-block: 112px 88px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.eyebrow.blue {
  color: var(--blue);
}

.eyebrow.blue-light {
  color: var(--blue-light);
}

.eyebrow.gold {
  color: var(--gold);
}

.eyebrow.teal {
  color: #68ccb1;
}

.eyebrow.coral {
  color: var(--coral);
}

.section-heading {
  max-width: 900px;
  margin-bottom: clamp(34px, 5vw, 66px);
}

.split-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
  align-items: end;
  gap: clamp(30px, 7vw, 100px);
  max-width: none;
}

.section-heading h2 {
  margin: 0;
  max-width: 900px;
  font-size: clamp(42px, 6.2vw, 86px);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.section-heading h2 span {
  color: var(--blue);
}

.dark .section-heading h2 span {
  color: var(--coral);
}

.lead {
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 1.8vw, 23px);
  line-height: 1.75;
}

.dark .lead {
  color: rgba(255, 255, 255, 0.64);
}

.cover {
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: white;
  background:
    linear-gradient(125deg, rgba(8, 19, 31, 0.96), rgba(13, 31, 52, 0.9)),
    radial-gradient(circle at 82% 24%, rgba(244, 104, 80, 0.4), transparent 25%),
    var(--navy-950);
}

.cover::before,
.cover::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.cover::before {
  inset: 0;
  background:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 58px 58px;
  mask-image: linear-gradient(to bottom right, black, transparent 74%);
}

.cover::after {
  width: 38vw;
  aspect-ratio: 1;
  right: -9vw;
  top: 10vh;
  border: 1px solid rgba(244, 104, 80, 0.26);
  border-radius: 50%;
  box-shadow: 0 0 0 70px rgba(244, 104, 80, 0.035), 0 0 0 140px rgba(244, 104, 80, 0.025);
}

.cover-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.55fr);
  align-items: end;
  gap: clamp(48px, 8vw, 132px);
  padding-top: 92px;
}

.cover-copy h1 {
  margin: 0;
  max-width: 1050px;
  font-size: clamp(52px, 8.2vw, 122px);
  line-height: 0.96;
  letter-spacing: -0.07em;
}

.cover-copy h1 span {
  color: var(--coral);
}

.cover-subtitle {
  margin: 34px 0 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: clamp(18px, 2vw, 28px);
  letter-spacing: 0.04em;
}

.cover-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 32px;
  margin-top: 26px;
  color: rgba(255, 255, 255, 0.44);
  font-size: 13px;
}

.cover-signal {
  padding: 28px;
  border-top: 3px solid var(--coral);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px);
}

.signal-index,
.signal-kicker {
  margin: 0;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.signal-index {
  color: rgba(255, 255, 255, 0.4);
}

.signal-kicker {
  margin-top: 34px;
  color: var(--coral);
}

.cover-signal strong {
  display: block;
  margin-top: 10px;
  font-size: clamp(26px, 2.8vw, 42px);
  line-height: 1.25;
}

.cover-signal > p:last-child {
  margin: 20px 0 0;
  color: rgba(255, 255, 255, 0.6);
}

.metric-strip {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: clamp(46px, 7vh, 90px);
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.metric-strip article {
  padding: 24px clamp(18px, 2.4vw, 34px);
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.metric-strip article:first-child {
  padding-left: 0;
}

.metric-strip article:last-child {
  border-right: 0;
}

.metric-strip span {
  display: block;
  color: rgba(255, 255, 255, 0.48);
  font-size: 12px;
}

.metric-strip strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(28px, 3.3vw, 50px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.metric-strip small,
.headline-number small {
  margin-left: 7px;
  font-size: 0.42em;
  font-weight: 650;
}

.coral {
  color: var(--coral) !important;
}

.teal {
  color: var(--teal) !important;
}

.cover-footnote {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.34);
  font-size: 12px;
}

.hero-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.hero-stat {
  min-height: 230px;
  padding: 32px;
  color: white;
}

.hero-stat span {
  font-size: 13px;
  font-weight: 760;
  letter-spacing: 0.12em;
}

.hero-stat strong {
  display: block;
  margin-top: 34px;
  font-size: clamp(44px, 5vw, 74px);
  line-height: 1;
}

.hero-stat p {
  margin: 22px 0 0;
  color: rgba(255, 255, 255, 0.72);
}

.coral-card {
  background: var(--coral);
}

.navy-card {
  background: var(--navy-800);
}

.gold-card {
  color: var(--navy-950);
  background: var(--gold);
}

.gold-card p {
  color: rgba(8, 19, 31, 0.64);
}

.insight-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.insight-grid.four-up {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.insight-card {
  padding: 28px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.48);
}

.card-index,
.path-label {
  margin: 0;
  color: var(--blue);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.insight-card h3,
.content-paths h3 {
  margin: 18px 0 12px;
  font-size: clamp(20px, 2vw, 28px);
  line-height: 1.35;
}

.insight-card > p:last-child,
.content-paths article > p:last-child {
  margin: 0;
  color: var(--muted);
}

.method-flow {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 16px;
}

.method-flow article {
  min-height: 200px;
  padding: 28px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.04);
}

.method-flow article > span {
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
}

.method-flow strong {
  display: block;
  margin-top: 30px;
  font-size: 24px;
}

.method-flow p {
  margin: 12px 0 0;
  color: rgba(255, 255, 255, 0.58);
}

.method-flow i {
  color: var(--coral);
  font-size: 24px;
  font-style: normal;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 18px;
}

.boundary-grid article {
  padding: 28px;
  background: rgba(255, 255, 255, 0.06);
}

.boundary-label {
  margin: 0;
  color: var(--teal);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.boundary-grid strong {
  display: block;
  margin-top: 14px;
  font-size: 28px;
}

.boundary-grid article > p:last-child {
  margin: 14px 0 0;
  color: rgba(255, 255, 255, 0.58);
}

.headline-number {
  padding: 24px 28px;
  border-left: 4px solid var(--coral);
  background: rgba(29, 47, 69, 0.06);
}

.headline-number.inverted {
  background: rgba(255, 255, 255, 0.06);
}

.headline-number span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
}

.dark .headline-number span {
  color: rgba(255, 255, 255, 0.5);
}

.headline-number strong {
  display: block;
  margin-top: 8px;
  color: var(--ink);
  font-size: clamp(38px, 4.4vw, 68px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.headline-number.inverted strong {
  color: white;
}

.media-card {
  margin: 0;
  padding: clamp(12px, 1.6vw, 22px);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
}

.media-card img {
  width: 100%;
  height: auto;
}

.media-card figcaption {
  padding: 13px 6px 0;
  color: var(--muted);
  font-size: 12px;
}

.white-frame {
  background: white;
}

.two-media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.compact-media {
  align-self: start;
}

.number-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 24px;
  background: var(--line);
  border: 1px solid var(--line);
}

.number-row article {
  padding: 24px;
  background: var(--paper-bright);
}

.number-row span,
.channel-card span,
.audience-metrics span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.number-row strong,
.channel-card strong {
  display: block;
  margin-top: 10px;
  font-size: clamp(22px, 2vw, 30px);
}

.number-row p,
.channel-card p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.analysis-note {
  margin: 24px 0 0;
  padding: 20px 24px;
  border-left: 4px solid var(--gold);
  color: var(--ink);
  background: rgba(29, 47, 69, 0.06);
}

.analysis-note.dark-note {
  color: rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.06);
}

.channel-cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.channel-card {
  padding: 28px;
  border-top: 4px solid;
  background: rgba(255, 255, 255, 0.06);
}

.channel-card span,
.channel-card p {
  color: rgba(255, 255, 255, 0.58);
}

.blue-channel {
  border-color: var(--blue);
}

.coral-channel {
  border-color: var(--coral);
}

.teal-channel {
  border-color: var(--teal);
}

.competition-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(300px, 0.45fr);
  gap: 20px;
}

.competition-signals {
  display: grid;
  gap: 14px;
}

.competition-signals article {
  padding: 24px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.06);
}

.competition-signals span {
  color: var(--coral);
  font-size: 12px;
  font-weight: 800;
}

.competition-signals strong {
  display: block;
  margin-top: 12px;
  font-size: 28px;
}

.competition-signals p {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.58);
}

.data-drawer {
  margin-top: 22px;
  border: 1px solid var(--line-dark);
  background: rgba(255, 255, 255, 0.05);
}

.data-drawer summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  cursor: pointer;
  font-weight: 760;
  list-style: none;
}

.data-drawer summary::-webkit-details-marker {
  display: none;
}

.data-drawer summary::after {
  color: var(--coral);
  content: "+";
  font-size: 24px;
}

.data-drawer[open] summary::after {
  content: "−";
}

.drawer-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 0 20px 20px;
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  background: white;
  color: var(--ink);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

caption {
  padding: 16px;
  color: white;
  background: var(--navy-800);
  text-align: left;
  font-weight: 760;
}

th,
td {
  padding: 11px 13px;
  border: 1px solid rgba(29, 47, 69, 0.12);
  text-align: left;
}

th {
  background: #e9eef4;
}

.content-paths {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.content-paths article {
  padding: 28px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.52);
}

.path-label.teal {
  color: var(--teal) !important;
}

.path-label.blue {
  color: var(--blue);
}

.audience-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 22px;
  background: var(--line-dark);
  border: 1px solid var(--line-dark);
}

.audience-metrics article {
  padding: 24px;
  background: rgba(255, 255, 255, 0.06);
}

.audience-metrics span {
  color: rgba(255, 255, 255, 0.5);
}

.audience-metrics strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(22px, 2.4vw, 34px);
}

.growth-decomposition {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 22px;
}

.growth-decomposition article {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 24px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.52);
}

.growth-decomposition article > span {
  color: var(--coral);
  font-size: clamp(28px, 3vw, 44px);
  font-weight: 850;
}

.growth-decomposition strong {
  font-size: 20px;
}

.growth-decomposition p {
  margin: 2px 0 0;
  color: var(--muted);
}

.conclusion {
  display: flex;
  color: white;
  background:
    linear-gradient(115deg, rgba(244, 104, 80, 0.98), rgba(220, 73, 54, 0.94)),
    var(--coral);
}

.conclusion .section-shell {
  width: min(1180px, calc(100% - (var(--pad-x) * 2)));
}

.conclusion .eyebrow {
  color: rgba(8, 19, 31, 0.62);
}

.conclusion .section-heading h2 {
  max-width: 1050px;
  color: var(--navy-950);
  font-size: clamp(54px, 7.4vw, 108px);
}

.takeaway-stack {
  display: grid;
  gap: 1px;
  background: rgba(8, 19, 31, 0.18);
  border: 1px solid rgba(8, 19, 31, 0.18);
}

.takeaway-stack article {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 24px;
  padding: 28px;
  color: var(--navy-950);
  background: rgba(255, 255, 255, 0.16);
}

.takeaway-stack article > span {
  font-size: 34px;
  font-weight: 850;
}

.takeaway-stack p {
  margin: 0;
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.14em;
}

.takeaway-stack h3 {
  margin: 6px 0;
  font-size: clamp(24px, 3vw, 42px);
  line-height: 1.2;
}

.takeaway-stack strong {
  color: rgba(8, 19, 31, 0.7);
}

.conclusion blockquote {
  margin: 28px 0 0;
  padding: 24px 28px;
  border-left: 5px solid var(--navy-950);
  color: var(--navy-950);
  background: rgba(255, 255, 255, 0.18);
  font-size: clamp(20px, 2.3vw, 32px);
  font-weight: 760;
}

.appendix .section-shell {
  justify-content: flex-start;
}

.light-drawer {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.5);
}

.light-drawer + .light-drawer {
  margin-top: 14px;
}

.light-drawer .table-wrap,
.light-drawer .method-notes {
  margin: 0 20px 20px;
}

.drawer-note {
  margin: 0;
  padding: 0 24px 22px;
  color: var(--muted);
  font-size: 13px;
}

.method-notes {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.method-notes article {
  padding: 20px;
  background: white;
}

.method-notes strong {
  color: var(--blue);
}

.method-notes p {
  margin: 8px 0 0;
  color: var(--muted);
}

.report-footer {
  display: grid;
  gap: 8px;
  margin-top: 60px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.report-footer p,
.report-footer strong {
  margin: 0;
}

.report-footer p {
  color: var(--muted);
  font-size: 12px;
}

.report-footer strong {
  font-size: 20px;
}

.index-dialog {
  width: min(820px, calc(100% - 30px));
  max-height: calc(100svh - 40px);
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: white;
  background: rgba(11, 23, 38, 0.98);
  box-shadow: 0 40px 120px rgba(0, 0, 0, 0.48);
}

.index-dialog::backdrop {
  background: rgba(2, 8, 14, 0.78);
  backdrop-filter: blur(8px);
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 28px;
  border-bottom: 1px solid var(--line-dark);
}

.dialog-head span {
  display: block;
  color: var(--coral);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.dialog-head strong {
  display: block;
  margin-top: 4px;
  font-size: 28px;
}

.dialog-head button {
  padding: 8px 15px;
}

.index-dialog ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--line-dark);
  list-style: none;
}

.index-dialog li {
  background: var(--navy-900);
}

.index-dialog a {
  display: flex;
  gap: 20px;
  padding: 18px 22px;
  text-decoration: none;
  transition: 150ms ease;
}

.index-dialog a:hover,
.index-dialog a:focus-visible {
  color: var(--navy-950);
  background: var(--coral);
  outline: none;
}

.index-dialog a span {
  color: var(--coral);
  font-weight: 800;
}

.index-dialog a:hover span,
.index-dialog a:focus-visible span {
  color: var(--navy-950);
}

.dialog-help {
  margin: 0;
  padding: 18px 28px;
  color: rgba(255, 255, 255, 0.44);
  font-size: 12px;
}

.mobile-controls {
  position: fixed;
  z-index: 105;
  left: 50%;
  bottom: 14px;
  display: none;
  align-items: center;
  gap: 12px;
  padding: 8px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  color: white;
  background: rgba(8, 19, 31, 0.84);
  transform: translateX(-50%);
  backdrop-filter: blur(16px);
}

.mobile-controls button {
  padding: 6px 12px;
  font-size: 12px;
}

.mobile-controls span {
  min-width: 54px;
  text-align: center;
  font-size: 11px;
}

@media (max-width: 1200px) {
  .side-rail {
    display: none;
  }

  .mobile-controls {
    display: flex;
  }

  .section-shell {
    padding-bottom: 112px;
  }

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

@media (max-width: 920px) {
  :root {
    --pad-x: 24px;
  }

  html {
    scroll-snap-type: none;
  }

  .topbar {
    min-height: 62px;
    padding: 10px 16px;
  }

  .brand > span:last-child {
    display: none;
  }

  .chapter-counter {
    display: none;
  }

  .section-shell {
    min-height: auto;
    padding-block: 96px 108px;
  }

  .cover {
    min-height: 100svh;
  }

  .cover-grid,
  .split-heading,
  .competition-layout {
    grid-template-columns: 1fr;
  }

  .cover-grid {
    gap: 34px;
    padding-top: 90px;
  }

  .cover-signal {
    max-width: 620px;
  }

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

  .metric-strip article:nth-child(2) {
    border-right: 0;
  }

  .metric-strip article:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .metric-strip article:nth-child(3) {
    padding-left: 0;
  }

  .hero-stat-grid,
  .insight-grid,
  .channel-cards,
  .content-paths,
  .growth-decomposition {
    grid-template-columns: 1fr;
  }

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

  .method-flow i {
    justify-self: center;
    transform: rotate(90deg);
  }

  .boundary-grid,
  .number-row,
  .audience-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .two-media-grid,
  .drawer-grid {
    grid-template-columns: 1fr;
  }

  .takeaway-stack article {
    grid-template-columns: 60px 1fr;
  }
}

@media (max-width: 620px) {
  body {
    font-size: 15px;
  }

  .section-heading h2 {
    font-size: clamp(38px, 12vw, 58px);
  }

  .cover-copy h1 {
    font-size: clamp(48px, 15vw, 72px);
  }

  .cover-subtitle {
    font-size: 16px;
  }

  .metric-strip,
  .boundary-grid,
  .number-row,
  .audience-metrics,
  .insight-grid.four-up,
  .method-notes {
    grid-template-columns: 1fr;
  }

  .metric-strip article {
    padding-left: 0;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .metric-strip article:last-child {
    border-bottom: 0;
  }

  .hero-stat {
    min-height: 190px;
  }

  .media-card {
    margin-inline: -10px;
    padding: 8px;
  }

  .index-dialog ol {
    grid-template-columns: 1fr;
  }

  .takeaway-stack article {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}