.checkpoint-hero {
  border-bottom: 1px solid var(--line-soft);
}

.checkpoint-hero-inner {
  display: grid;
  min-height: 660px;
  padding-block: clamp(96px, 10vw, 144px);
  grid-template-columns: minmax(0, 1.25fr) minmax(260px, 0.75fr);
  align-items: center;
  gap: clamp(64px, 9vw, 132px);
}

.breadcrumb {
  display: flex;
  margin-bottom: 44px;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumb a {
  color: var(--blue);
}

.checkpoint-intro .kicker {
  margin-bottom: 18px;
}

.checkpoint-intro h1 {
  margin-bottom: 26px;
  font-size: clamp(58px, 7.1vw, 92px);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.94;
}

.checkpoint-lede {
  max-width: 720px;
  margin-bottom: 28px;
  color: #3a3a3c;
  font-size: clamp(19px, 2vw, 24px);
  letter-spacing: -0.015em;
  line-height: 1.45;
}

.research-notice {
  display: inline-flex;
  margin: 0;
  align-items: center;
  gap: 9px;
  color: #8b2b23;
  font-size: 14px;
  font-weight: 700;
}

.research-notice span {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--text-orange);
}

.checkpoint-mark {
  display: grid;
  aspect-ratio: 0.88;
  min-width: 0;
  border: 1px solid var(--line);
  align-content: space-between;
  padding: clamp(28px, 4vw, 52px);
}

.checkpoint-mark p,
.checkpoint-mark span {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.045em;
  text-transform: uppercase;
}

.checkpoint-mark strong {
  color: var(--ink);
  font-size: clamp(76px, 10vw, 138px);
  letter-spacing: -0.07em;
  line-height: 0.8;
}

.checkpoint-mark span {
  width: max-content;
  border-top: 3px solid var(--text-orange);
  padding-top: 14px;
}

.checkpoint-overview {
  background: var(--soft);
  padding-block: clamp(88px, 10vw, 136px);
}

.checkpoint-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(320px, 0.65fr);
  align-items: start;
  gap: clamp(56px, 8vw, 104px);
}

.checkpoint-heading {
  max-width: 760px;
  margin-bottom: 52px;
}

.checkpoint-heading .kicker {
  margin-bottom: 16px;
}

.checkpoint-heading h2 {
  margin-bottom: 0;
  font-size: clamp(38px, 4.8vw, 60px);
  letter-spacing: -0.045em;
  line-height: 1.02;
}

.limitation-notice {
  margin-bottom: 56px;
  border-left: 3px solid var(--text-orange);
  background: var(--white);
  padding: 28px 30px;
}

.limitation-notice h3,
.technical-section h3 {
  margin-bottom: 12px;
  font-size: 17px;
  letter-spacing: -0.015em;
}

.limitation-notice p,
.technical-section p {
  margin-bottom: 12px;
  color: #3a3a3c;
  font-size: 16px;
  line-height: 1.55;
}

.limitation-notice p:last-child,
.technical-section p:last-child {
  margin-bottom: 0;
}

.technical-section {
  padding-block: 34px;
  border-top: 1px solid var(--line);
}

.checkpoint-facts {
  display: grid;
  margin: 22px 0 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.checkpoint-facts div {
  min-width: 0;
  padding: 17px 22px 17px 0;
  border-bottom: 1px solid var(--line);
}

.checkpoint-facts .wide-fact {
  grid-column: 1 / -1;
}

.checkpoint-facts dt,
.download-facts dt {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.035em;
  line-height: 1.35;
  text-transform: uppercase;
}

.checkpoint-facts dd,
.download-facts dd {
  margin: 6px 0 0;
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
}

.checkpoint-facts code,
.download-facts code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.88em;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.download-panel {
  position: sticky;
  top: 76px;
  border: 1px solid var(--line);
  background: var(--white);
  padding: 34px;
}

.download-panel .kicker {
  margin-bottom: 14px;
}

.download-panel h2 {
  margin-bottom: 12px;
  font-size: 34px;
  letter-spacing: -0.035em;
}

.download-filename {
  margin-bottom: 24px;
  color: #3a3a3c;
  font-size: 13px;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.download-facts {
  display: grid;
  margin: 0 0 28px;
  gap: 18px;
}

.checkpoint-download {
  width: 100%;
  min-height: 50px;
  padding-inline: 18px;
  text-align: center;
}

.download-secondary-actions {
  display: grid;
  margin-top: 14px;
  gap: 4px;
}

.download-secondary-actions .secondary-action,
.download-secondary-actions .text-button {
  width: 100%;
  min-height: 44px;
}

.checksum-copy {
  color: var(--blue);
}

.copy-feedback {
  min-height: 22px;
  margin: 10px 0 0;
  color: var(--green);
  font-size: 13px;
  font-weight: 600;
  text-align: center;
}

.copy-feedback.is-error {
  color: var(--error);
}

.verification-note {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
  text-align: center;
}

@media (max-width: 980px) {
  .checkpoint-hero-inner {
    min-height: auto;
    grid-template-columns: minmax(0, 1.45fr) minmax(220px, 0.55fr);
  }

  .checkpoint-layout {
    grid-template-columns: 1fr;
  }

  .download-panel {
    position: static;
    max-width: 620px;
  }
}

@media (max-width: 720px) {
  .checkpoint-hero-inner {
    padding-block: 76px 88px;
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .checkpoint-mark {
    width: min(100%, 360px);
    aspect-ratio: 1.35;
  }

  .breadcrumb {
    margin-bottom: 34px;
  }

  .checkpoint-intro h1 {
    font-size: clamp(50px, 15vw, 72px);
  }

  .checkpoint-facts {
    grid-template-columns: 1fr;
  }

  .checkpoint-facts .wide-fact {
    grid-column: auto;
  }

  .download-panel {
    padding: 28px 24px;
  }
}

@media (max-width: 520px) {
  .checkpoint-hero-inner {
    padding-block: 60px 76px;
  }

  .checkpoint-overview {
    padding-block: 72px;
  }

  .checkpoint-heading {
    margin-bottom: 40px;
  }

  .limitation-notice {
    padding: 24px 22px;
  }

  .download-panel {
    margin-inline: -2px;
  }
}