.sentinel-hero {
  position: relative;
  isolation: isolate;
  display: flex;
  min-height: min(94svh, 980px);
  align-items: flex-end;
  overflow: hidden;
  padding-block: 10rem clamp(3rem, 6vw, 5rem);
  background: var(--navy-deep);
  color: var(--cream);
}

.sentinel-hero .hero-media img {
  object-position: center 43%;
  filter: saturate(.82);
  animation: sentinel-image 1.2s cubic-bezier(.16, 1, .3, 1) both;
}

.sentinel-hero-content {
  animation: sentinel-copy 800ms cubic-bezier(.16, 1, .3, 1) 120ms both;
}

.sentinel-hero h1 {
  max-width: 16ch;
  color: #fffdf8;
  font-size: clamp(2.8rem, 4.8vw, 4.4rem);
  opacity: 1;
  text-wrap: balance;
  text-shadow:
    0 2px 20px rgb(7 27 41 / 48%),
    0 1px 3px rgb(7 27 41 / 72%);
}

.sentinel-hero-content > p:last-of-type {
  max-width: 62ch;
  margin-top: 1.5rem;
  color: #f8fbfa;
  font-size: clamp(1.08rem, 1.7vw, 1.25rem);
  opacity: 1;
  text-shadow:
    0 3px 20px rgb(7 27 41 / 82%),
    0 1px 3px rgb(7 27 41 / 96%);
}

@keyframes sentinel-image {
  from {
    filter: saturate(.65) brightness(.75);
    transform: scale(1.025);
  }
  to {
    filter: saturate(.82);
    transform: none;
  }
}

@keyframes sentinel-copy {
  from {
    transform: translateY(18px);
  }
  to {
    transform: none;
  }
}

.sentinel-intro {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(3rem, 4.5vw, 4.25rem);
  background: var(--paper);
}

.sentinel-intro::before {
  position: absolute;
  z-index: 0;
  inset: -12% 49% -18% -10%;
  background: url("../graphics/coastal-alignment-contours.svg") left center / contain no-repeat;
  content: "";
  opacity: 0.17;
  pointer-events: none;
  transform: rotate(-3deg);
}

.intro-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: start;
  gap: clamp(2.5rem, 6vw, 5rem);
}

.intro-layout h2 {
  max-width: none;
}

.intro-copy p {
  max-width: 58ch;
  color: var(--muted);
  font-size: 1.06rem;
}

.intro-copy p + p {
  margin-top: 1.25rem;
}

.earth-span-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(2.5rem, 6vw, 5rem);
}

.earth-span-copy h2 {
  max-width: none;
}

.earth-span-copy p {
  max-width: 54ch;
  margin-top: 1.25rem;
  color: var(--muted-light);
}

.earth-span-figure {
  --axis-x: 34px;
  position: relative;
  max-width: 650px;
}

.earth-span-figure::before {
  position: absolute;
  z-index: 0;
  top: 44px;
  bottom: 31px;
  left: var(--axis-x);
  border-left: 1px dashed rgb(112 209 198 / 48%);
  content: "";
}

.span-sun {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 61px 1fr;
  align-items: center;
  gap: 0.9375rem;
  padding-bottom: 1rem;
}

.sun-disc {
  width: 38px;
  height: 38px;
  margin-left: 15px;
  border: 4px solid var(--navy-deep);
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px var(--navy-deep);
  outline: 1px solid rgb(232 160 63 / 48%);
}

.sun-context-copy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 0.2rem 1rem;
}

.sun-context-copy h3 {
  grid-column: 1 / -1;
  margin-bottom: 0.1rem;
  color: var(--cream);
  font-family: "Spline Sans", system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0;
}

.sun-metric {
  display: contents;
}

.sun-metric span {
  color: var(--muted-light);
  font-size: 0.78rem;
}

.earth-layers {
  position: relative;
  z-index: 1;
  list-style: none;
}

.earth-layers::before,
.earth-layers li + li::after {
  position: absolute;
  right: 0;
  left: 4.75rem;
  height: 1px;
  background: rgb(205 222 229 / 16%);
  content: "";
}

.earth-layers::before {
  top: 0;
}

.earth-layers li + li::after {
  top: 0;
}

.earth-layers li {
  position: relative;
  display: grid;
  grid-template-columns: 0.8fr 1fr 0.65fr;
  align-items: center;
  gap: 1rem;
  min-height: 62px;
  padding: 0.9rem 0 0.9rem 4.75rem;
}

.earth-layers li::before {
  position: absolute;
  z-index: 2;
  top: calc(50% - 9px);
  left: calc(var(--axis-x) - 9px);
  width: 18px;
  height: 18px;
  border: 2px solid var(--navy-deep);
  border-radius: 50%;
  background: var(--teal-bright);
  box-shadow:
    0 0 0 4px var(--navy-deep),
    0 0 0 5px rgb(112 209 198 / 55%);
  content: "";
}

.earth-layers li:last-child::before {
  background: var(--orange);
  box-shadow:
    0 0 0 4px var(--navy-deep),
    0 0 0 5px rgb(232 160 63 / 55%);
}

.layer-name {
  color: var(--cream);
  font-family: "Spline Sans", system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0;
}

.layer-detail {
  color: var(--muted-light);
  font-size: 0.82rem;
}

.earth-layers strong,
.sun-metric strong {
  color: var(--teal-bright);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: right;
  text-transform: uppercase;
}

.timing-divider {
  margin-top: clamp(2.75rem, 5vw, 4rem);
  padding-top: clamp(2.25rem, 4vw, 3rem);
  border-top: 1px solid var(--line-light);
}

.timing-heading {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  align-items: end;
  gap: 2.5rem;
}

.timing-heading h2 {
  max-width: none;
}

.timing-heading > p:last-child {
  max-width: 50ch;
  color: var(--muted-light);
}

.timing-sequence {
  --sequence-marker-size: 40px;

  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: clamp(2.75rem, 5vw, 4rem);
  list-style: none;
}

.timing-sequence::before {
  position: absolute;
  top: calc((var(--sequence-marker-size) - 1px) / 2);
  right: calc(25% + (var(--gutter) / 2) - (var(--sequence-marker-size) / 2));
  left: calc(var(--gutter) + (var(--sequence-marker-size) / 2));
  height: 1px;
  background: var(--line-light);
  content: "";
}

.timing-sequence li {
  position: relative;
  padding-right: 1.5rem;
}

.sequence-number {
  position: relative;
  z-index: 1;
  display: grid;
  width: var(--sequence-marker-size);
  height: var(--sequence-marker-size);
  place-items: center;
  margin-bottom: 1.4rem;
  border: 1px solid rgb(112 209 198 / 48%);
  border-radius: 50%;
  background: var(--navy-deep);
  color: var(--teal-bright);
  font-size: 0.82rem;
  font-weight: 600;
}

.timing-sequence h3 {
  margin-bottom: 0.65rem;
  color: var(--cream);
  font-family: "Spline Sans", system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0;
}

.timing-sequence p {
  max-width: 26ch;
  color: var(--muted-light);
  font-size: 0.91rem;
}

.partner-section {
  background: var(--paper);
}

.partner-layout {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  column-gap: clamp(3rem, 9vw, 8rem);
  row-gap: clamp(1.4rem, 2.5vw, 2rem);
}

.partner-title h2 {
  max-width: none;
}

.sentinel-intro h2,
.timing-section h2,
.partner-section h2 {
  font-size: clamp(1.95rem, 3.2vw, 2.9rem);
}

.partner-copy > p {
  max-width: 56ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.partner-groups {
  grid-column: 1 / -1;
  display: grid;
  gap: 0.8rem;
}

.partner-groups > p {
  color: var(--muted);
  font-size: 0.95rem;
}

.partner-uses {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  gap: 0.8rem clamp(2rem, 6vw, 5rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  list-style: none;
}

.partner-uses li {
  color: var(--navy);
  font-size: clamp(0.86rem, 1vw, 0.9rem);
  font-weight: 600;
  line-height: 1.4;
  white-space: normal;
}

@media (max-width: 860px) {
  .sentinel-intro::before {
    inset: -8% 26% 8% -32%;
    opacity: 0.12;
  }

  .intro-layout,
  .earth-span-layout,
  .timing-heading,
  .partner-layout {
    grid-template-columns: 1fr;
  }

  .timing-heading {
    align-items: start;
  }

  .timing-sequence {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem 1.5rem;
  }

  .timing-sequence::before {
    display: none;
  }
}

@media (max-width: 600px) {
  .partner-uses {
    grid-template-columns: 1fr;
    align-items: flex-start;
    gap: 0.7rem 0;
  }

  .sentinel-hero {
    min-height: 86svh;
    padding-bottom: 4rem;
  }

  .sentinel-hero .hero-media img {
    object-position: 58% center;
  }

  .timing-sequence {
    grid-template-columns: 1fr;
  }

  .earth-layers li {
    grid-template-columns: 1fr auto;
    gap: 0.15rem 1rem;
    padding-left: 4.75rem;
  }

  .layer-detail {
    grid-column: 1;
  }

  .earth-layers strong {
    grid-column: 2;
    grid-row: 1 / 3;
    align-self: center;
  }

  .timing-sequence li {
    display: grid;
    grid-template-columns: 42px 1fr;
    column-gap: 1rem;
    padding-right: 0;
  }

  .sequence-number {
    grid-row: span 2;
    margin-bottom: 0;
  }

  .timing-sequence h3 {
    align-self: end;
  }
}