:root {
  --iar-ink: #0f172a;
  --iar-text: #111827;
  --iar-muted: #6b7280;
  --iar-soft-muted: #9ca3af;
  --iar-border: rgba(0, 0, 0, 0.08);
  --iar-border-strong: #dce7ee;
  --iar-accent: #87afc7;
  --iar-accent-dark: #4a7d99;
  --iar-accent-soft: #eef4f8;
  --iar-panel: #fbfdfe;
  --iar-cta: #1a1a1a;
  --iar-warn: #9a4a3c;
  --iar-gold: #b98218;
  --iar-shadow: 0 4px 18px rgba(135, 175, 199, 0.16);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  padding: 0 0 72px;
  background: #ffffff;
  color: var(--iar-text);
  font-family:
    "Plus Jakarta Sans",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

a {
  color: inherit;
}

button {
  font: inherit;
}

.iar-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 32px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.iar-nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--iar-ink);
  text-decoration: none;
}

.iar-nav-logo img {
  width: 26px;
  height: 26px;
  border-radius: 6px;
}

.iar-nav-logo span {
  color: var(--iar-ink);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
}

.iar-nav-cta,
.iar-primary-link,
.iar-secondary-link,
.iar-source-link,
.iar-cta a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 8px;
  text-decoration: none;
  transition:
    opacity 150ms ease,
    border-color 150ms ease,
    background 150ms ease,
    transform 150ms ease;
}

.iar-nav-cta,
.iar-primary-link,
.iar-cta a {
  background: var(--iar-cta);
  color: #ffffff;
}

.iar-nav-cta {
  min-height: 34px;
  padding: 8px 18px;
  font-size: 12.5px;
  font-weight: 600;
}

.iar-nav-cta:hover,
.iar-primary-link:hover,
.iar-secondary-link:hover,
.iar-source-link:hover,
.iar-cta a:hover {
  opacity: 0.86;
  transform: translateY(-1px);
}

.iar-layout {
  display: flex;
  min-height: 100vh;
  background: #ffffff;
}

.iar-main {
  flex: 1;
  min-width: 0;
  margin-left: 228px;
}

.iar-page {
  width: 100%;
  min-width: 0;
}

.iar-toc {
  position: fixed;
  top: 55px;
  left: 0;
  z-index: 90;
  width: 228px;
  height: calc(100vh - 55px);
  overflow-y: auto;
  border-right: 1px solid rgba(0, 0, 0, 0.06);
  background: #fafbfd;
}

.iar-toc-inner {
  padding: 20px 14px 24px;
}

.iar-toc-title {
  padding: 8px 10px 12px;
  color: var(--iar-soft-muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-toc-list {
  display: grid;
  gap: 2px;
  list-style: none;
}

.iar-toc-link {
  display: block;
  width: 100%;
  padding: 9px 10px;
  border-radius: 10px;
  color: var(--iar-muted);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  transition:
    background 150ms ease,
    color 150ms ease;
}

.iar-toc-link:hover {
  background: rgba(0, 0, 0, 0.035);
  color: var(--iar-ink);
}

.iar-toc-link.active {
  background: rgba(135, 175, 199, 0.12);
  color: var(--iar-ink);
  box-shadow: inset 2px 0 0 var(--iar-accent);
}

.iar-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.75fr);
  gap: 22px;
  align-items: start;
  padding: 42px 48px 20px;
}

.iar-hero-copy {
  min-width: 0;
}

.iar-kicker,
.iar-eyebrow {
  display: inline-flex;
  align-items: center;
  color: var(--iar-accent-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-kicker {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--iar-accent-soft);
}

.iar-eyebrow {
  margin: 0 0 10px;
}

.iar-hero h1 {
  max-width: 790px;
  margin-top: 18px;
  color: var(--iar-ink);
  font-size: 43px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.06;
}

.iar-thesis {
  max-width: 700px;
  margin-top: 14px;
  color: var(--iar-muted);
  font-size: 15px;
  line-height: 1.55;
}

.iar-hero-take {
  max-width: 680px;
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 3px solid var(--iar-accent);
  border-radius: 0 12px 12px 0;
  background: #fafbfd;
}

.iar-hero-take span {
  display: block;
  color: var(--iar-accent-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-hero-take p {
  margin-top: 6px;
  color: var(--iar-ink);
  font-size: 14px;
  font-weight: 750;
  line-height: 1.45;
}

.iar-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
  margin-top: 8px;
  color: var(--iar-soft-muted);
  font-size: 12px;
  line-height: 1.5;
}

.iar-hero-meta span {
  color: #d1d5db;
}

.iar-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.iar-primary-link,
.iar-secondary-link {
  min-height: 38px;
  padding: 9px 16px;
  font-size: 12.5px;
  font-weight: 700;
}

.iar-secondary-link {
  border: 1px solid var(--iar-border);
  background: #ffffff;
  color: var(--iar-muted);
}

.iar-secondary-link:hover {
  border-color: var(--iar-accent);
  color: var(--iar-ink);
  background: #f6fafc;
}

.iar-hero-panel {
  display: grid;
  gap: 12px;
}

.iar-signal-card {
  min-height: 108px;
  padding: 14px;
  border: 1px solid var(--iar-border);
  border-radius: 16px;
  background: linear-gradient(180deg, #fbfdfe 0%, #f5f9fb 100%);
}

.iar-signal-card span {
  display: block;
  color: var(--iar-soft-muted);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-signal-card strong {
  display: block;
  margin-top: 8px;
  color: var(--iar-ink);
  font-size: 26px;
  font-weight: 800;
  line-height: 1;
}

.iar-signal-card p {
  margin-top: 6px;
  color: var(--iar-muted);
  font-size: 12px;
  line-height: 1.45;
}

.iar-source-article {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.36fr);
  gap: 18px;
  align-items: stretch;
  margin: 12px 48px 0;
  padding: 22px;
  border: 1px solid var(--iar-border);
  border-radius: 16px;
  background: #ffffff;
  scroll-margin-top: 78px;
}

.iar-source-article h2,
.iar-section h2,
.iar-cta h2 {
  color: var(--iar-ink);
  font-size: 27px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.12;
}

.iar-source-article p,
.iar-section-header p:not(.iar-eyebrow),
.iar-kinro-fit > div > p,
.iar-cta p {
  max-width: 760px;
  margin-top: 10px;
  color: var(--iar-muted);
  font-size: 13px;
  line-height: 1.65;
}

.iar-source-link {
  min-height: 120px;
  align-items: flex-start;
  flex-direction: column;
  padding: 16px;
  border: 1px solid #d7e3ea;
  background: var(--iar-accent-soft);
  color: var(--iar-ink);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.35;
}

.iar-source-link span {
  color: var(--iar-accent-dark);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-section {
  margin-top: 52px;
  padding-top: 36px;
  border-top: 1px solid var(--iar-border);
  scroll-margin-top: 78px;
}

.iar-section-header {
  max-width: 880px;
  padding: 0 48px 22px;
}

.iar-why-strip,
.iar-principles-grid,
.iar-source-grid,
.iar-engine,
.iar-kinro-flow {
  display: grid;
  gap: 14px;
}

.iar-why-strip,
.iar-principles-grid,
.iar-source-grid,
.iar-engine {
  padding: 0 48px;
}

.iar-why-strip {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.iar-principles-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.iar-source-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
}

.iar-why-strip article,
.iar-principle-card,
.iar-flow-step,
.iar-source-card {
  border: 1px solid var(--iar-border);
  border-radius: 16px;
  background: #ffffff;
  transition:
    border-color 150ms ease,
    box-shadow 150ms ease,
    transform 150ms ease;
}

.iar-why-strip article,
.iar-principle-card {
  padding: 16px;
}

.iar-why-strip article:hover,
.iar-principle-card:hover,
.iar-flow-step:hover,
.iar-source-card:hover {
  border-color: var(--iar-accent);
  box-shadow: var(--iar-shadow);
  transform: translateY(-2px);
}

.iar-why-strip article > span,
.iar-principle-card > span,
.iar-flow-step > span {
  color: var(--iar-accent-dark);
}

.iar-why-strip h3,
.iar-principle-card h3,
.iar-source-card h3 {
  margin-top: 10px;
  color: var(--iar-ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.3;
}

.iar-why-strip p,
.iar-principle-card p,
.iar-source-card p {
  margin-top: 8px;
  color: var(--iar-muted);
  font-size: 12.75px;
  line-height: 1.58;
}

.iar-why-strip article {
  display: grid;
  min-height: 88px;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 12px;
  align-items: center;
}

.iar-why-strip article > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--iar-accent-soft);
}

.iar-why-strip small {
  color: var(--iar-soft-muted);
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-why-strip h3 {
  margin-top: 3px;
  font-size: 15px;
}

.iar-why-strip p {
  margin-top: 3px;
  font-size: 12px;
  line-height: 1.35;
}

.iar-segmented {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  padding: 8px;
  border: 1px solid var(--iar-border);
  border-radius: 16px;
  background: #fafbfd;
}

.iar-segmented button {
  display: flex;
  min-height: 58px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 9px 12px;
  border: 1px solid var(--iar-border);
  border-radius: 10px;
  background: #ffffff;
  color: var(--iar-muted);
  cursor: pointer;
  font-size: 12.5px;
  font-weight: 700;
  line-height: 1.25;
  transition:
    background 150ms ease,
    border-color 150ms ease,
    color 150ms ease;
}

.iar-tab-label {
  color: inherit;
  font-size: 12.5px;
  font-weight: 800;
  line-height: 1.25;
}

.iar-tab-meta {
  margin-top: 5px;
  color: var(--iar-soft-muted);
  font-size: 10.5px;
  font-weight: 700;
  line-height: 1.25;
}

.iar-segmented button:hover {
  border-color: var(--iar-accent);
  color: var(--iar-ink);
}

.iar-segmented button.is-active {
  border-color: var(--iar-ink);
  background: var(--iar-ink);
  color: #ffffff;
}

.iar-segmented button.is-active .iar-tab-meta {
  color: rgba(255, 255, 255, 0.64);
}

.iar-engine-panel {
  padding: 12px;
  border: 1px solid var(--iar-border);
  border-radius: 16px;
  background: #ffffff;
}

.iar-active-segment {
  display: grid;
  grid-template-columns: minmax(140px, 0.28fr) minmax(0, 0.45fr) minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 14px;
  border-radius: 14px;
  background: var(--iar-ink);
  color: #ffffff;
}

.iar-active-segment span {
  color: var(--iar-accent);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.iar-active-segment h3 {
  color: #ffffff;
  font-size: 24px;
  font-weight: 800;
  line-height: 1.1;
}

.iar-active-segment p {
  color: rgba(255, 255, 255, 0.78);
  font-size: 12.5px;
  line-height: 1.5;
}

.iar-engine-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-top: 12px;
  overflow: hidden;
  border: 1px solid var(--iar-border);
  border-radius: 14px;
  background: var(--iar-panel);
}

.iar-flow-step {
  position: relative;
  min-height: 128px;
  padding: 14px 13px;
  border: 0;
  border-right: 1px solid var(--iar-border);
  border-radius: 0;
  background: transparent;
}

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

.iar-flow-step:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -7px;
  z-index: 1;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--iar-border-strong);
  border-right: 1px solid var(--iar-border-strong);
  background: var(--iar-panel);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.iar-flow-step.is-warning {
  border-color: rgba(154, 74, 60, 0.32);
  background: #fff8f5;
}

.iar-flow-step > span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 8px;
  background: var(--iar-accent-soft);
}

.iar-flow-step.is-warning > span {
  background: #f4e3dc;
  color: var(--iar-warn);
}

.iar-flow-step small {
  display: block;
  color: var(--iar-soft-muted);
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.25;
  text-transform: uppercase;
}

.iar-flow-step p {
  margin-top: 8px;
  color: #374151;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}

.iar-principles-section {
  border-top: 0;
}

.iar-principle-card {
  min-height: 128px;
  padding: 14px;
}

.iar-principle-card small {
  display: block;
  margin-top: 8px;
  color: var(--iar-soft-muted);
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.25;
  text-transform: uppercase;
}

.iar-principle-card h3 {
  margin-top: 7px;
  font-size: 14.5px;
}

.iar-principle-card p {
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.4;
}

.iar-kinro-fit {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  padding-right: 48px;
  padding-left: 48px;
}

.iar-kinro-fit > div:first-child {
  min-width: 0;
}

.iar-kinro-fit .iar-eyebrow,
.iar-kinro-fit h2,
.iar-kinro-fit > div > p {
  margin-left: 0;
}

.iar-kinro-flow {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  overflow: hidden;
  border: 1px solid var(--iar-border);
  border-radius: 16px;
  background: #ffffff;
}

.iar-kinro-flow article {
  position: relative;
  min-height: 132px;
  padding: 18px 16px;
  border-right: 1px solid var(--iar-border);
}

.iar-kinro-flow article:last-child {
  border-right: 0;
}

.iar-kinro-flow article:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -7px;
  z-index: 1;
  width: 14px;
  height: 14px;
  border-top: 1px solid var(--iar-border-strong);
  border-right: 1px solid var(--iar-border-strong);
  background: #ffffff;
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.iar-kinro-flow span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  background: var(--iar-accent-soft);
  color: var(--iar-accent-dark);
  font-size: 10px;
  font-weight: 800;
}

.iar-kinro-flow h3 {
  margin-top: 14px;
  color: var(--iar-ink);
  font-size: 15px;
  font-weight: 800;
  line-height: 1.25;
}

.iar-kinro-flow p {
  margin-top: 6px;
  color: var(--iar-muted);
  font-size: 12px;
  line-height: 1.4;
}

.iar-cta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 28px;
  align-items: center;
  margin: 52px 48px 0;
  padding: 26px;
  border: 1px solid #d7e3ea;
  border-radius: 16px;
  background: var(--iar-accent-soft);
}

.iar-cta a {
  min-height: 44px;
  padding: 12px 18px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.iar-source-card {
  display: grid;
  min-height: 72px;
  grid-template-columns: minmax(120px, 0.32fr) minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 10px 12px;
  color: inherit;
  text-decoration: none;
}

.iar-source-meta {
  color: var(--iar-accent-dark);
  font-size: 9.5px;
  font-weight: 800;
  letter-spacing: 0;
  line-height: 1.3;
  text-transform: uppercase;
}

.iar-source-card h3 {
  margin-top: 0;
  font-size: 13px;
  line-height: 1.22;
}

.iar-source-card p {
  margin-top: 3px;
  font-size: 11.5px;
  line-height: 1.32;
}

.iar-source-card small {
  display: flex;
  gap: 7px;
  align-items: center;
  margin-top: 0;
  padding-top: 0;
  color: var(--iar-muted);
  font-size: 11px;
  line-height: 1.4;
}

@media (max-width: 1180px) {
  .iar-principles-grid,
  .iar-why-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .iar-principle-card {
    min-height: auto;
  }

  .iar-engine-flow {
    grid-template-columns: 1fr;
    gap: 8px;
    overflow: visible;
    border: 0;
    background: transparent;
  }

  .iar-flow-step {
    min-height: auto;
    border: 1px solid var(--iar-border);
    border-radius: 12px;
    background: var(--iar-panel);
  }

  .iar-flow-step:not(:last-child)::after {
    display: none;
  }
}

@media (max-width: 980px) {
  .iar-toc {
    display: none;
  }

  .iar-main {
    margin-left: 0;
  }

  .iar-hero,
  .iar-source-article,
  .iar-active-segment,
  .iar-kinro-fit,
  .iar-cta {
    grid-template-columns: 1fr;
  }

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

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

  .iar-cta a {
    width: fit-content;
  }
}

@media (max-width: 720px) {
  body {
    padding-bottom: 48px;
  }

  .iar-nav {
    padding: 10px 16px;
  }

  .iar-nav-logo span {
    font-size: 12px;
  }

  .iar-nav-cta {
    min-height: 32px;
    padding: 7px 14px;
  }

  .iar-hero {
    padding: 24px 20px 16px;
  }

  .iar-hero h1 {
    margin-top: 16px;
    font-size: 28px;
    line-height: 1.1;
  }

  .iar-thesis {
    font-size: 14px;
  }

  .iar-hero-take {
    margin-top: 14px;
    padding: 12px 14px;
  }

  .iar-hero-take p {
    font-size: 13px;
  }

  .iar-hero-meta {
    margin-top: 8px;
  }

  .iar-hero-actions {
    width: 100%;
    margin-top: 18px;
  }

  .iar-primary-link,
  .iar-secondary-link {
    width: 100%;
  }

  .iar-section-header,
  .iar-why-strip,
  .iar-principles-grid,
  .iar-source-grid,
  .iar-engine,
  .iar-kinro-fit {
    padding-right: 20px;
    padding-left: 20px;
  }

  .iar-source-article,
  .iar-cta {
    margin-right: 20px;
    margin-left: 20px;
    padding: 18px;
  }

  .iar-source-article h2,
  .iar-section h2,
  .iar-cta h2 {
    font-size: 22px;
  }

  .iar-section {
    margin-top: 42px;
    padding-top: 30px;
  }

  .iar-why-strip,
  .iar-principles-grid,
  .iar-source-grid,
  .iar-segmented {
    grid-template-columns: 1fr;
  }

  .iar-kinro-flow {
    grid-template-columns: 1fr;
    overflow: visible;
    border: 0;
    gap: 8px;
    background: transparent;
  }

  .iar-kinro-flow article {
    min-height: auto;
    border: 1px solid var(--iar-border);
    border-radius: 12px;
    background: #ffffff;
  }

  .iar-kinro-flow article:not(:last-child)::after {
    display: none;
  }

  .iar-source-card {
    grid-template-columns: 1fr auto;
  }

  .iar-source-meta {
    grid-column: 1 / -1;
  }

  .iar-engine-panel {
    padding: 10px;
  }

  .iar-active-segment {
    padding: 16px;
  }

  .iar-active-segment h3 {
    font-size: 22px;
  }

  .iar-signal-card {
    min-height: auto;
    padding: 12px;
  }

  .iar-signal-card strong {
    font-size: 22px;
  }

  .iar-hero-panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .iar-signal-card span {
    font-size: 9px;
    line-height: 1.2;
  }

  .iar-signal-card p {
    display: none;
  }

  .iar-cta a,
  .iar-source-link {
    width: 100%;
  }
}