.os28-section {
  position: relative;
  overflow: hidden;
  padding: 156px 0 168px;
  background:
    radial-gradient(circle at 73% 46%, rgba(127, 212, 255, 0.09), transparent 31%),
    #030405;
  border-bottom: 1px solid var(--line);
  isolation: isolate;
}

.os28-section::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(213, 226, 238, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(213, 226, 238, 0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 22%, #000 78%, transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 22%, #000 78%, transparent);
  pointer-events: none;
}

.os28-shell {
  display: grid;
  grid-template-columns: minmax(420px, 0.86fr) minmax(600px, 1.14fr);
  align-items: center;
  gap: 82px;
}

.os28-copy {
  position: relative;
  z-index: 2;
}

.os28-copy > .section-label {
  margin-bottom: 32px;
}

.os28-copy > h2 {
  max-width: 620px;
  margin: 0;
  font-family: var(--font-display);
  font-size: 70px;
  font-weight: 300;
  line-height: 1.01;
}

.os28-intro {
  max-width: 610px;
  margin: 30px 0 0;
  color: var(--silver);
  font-size: 17px;
  font-weight: 300;
  line-height: 1.72;
}

.os28-metric {
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
}

.os28-cta {
  margin-top: 28px;
}

.os28-cta svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.os28-detail {
  min-height: 340px;
  margin-top: 82px;
  padding-top: 27px;
  border-top: 1px solid var(--line-strong);
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 180ms ease,
    transform 220ms var(--ease);
}

.os28-detail.is-transitioning {
  opacity: 0;
  transform: translateY(8px);
}

.os28-detail-heading {
  display: grid;
  grid-template-columns: 48px 1fr;
  align-items: baseline;
  gap: 18px;
}

.os28-detail-index {
  color: var(--blue);
  font-size: 12px;
}

.os28-detail h3 {
  margin: 0;
  color: var(--white);
  font-size: 24px;
  font-weight: 400;
}

.os28-detail-description {
  max-width: 610px;
  margin: 20px 0 0 66px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.os28-projects {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 26px 0 0 66px;
}

.os28-project-chip {
  min-height: 30px;
  display: inline-flex;
  align-items: center;
  padding: 0 11px;
  border: 1px solid rgba(213, 226, 238, 0.14);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.018);
  color: rgba(213, 226, 238, 0.72);
  font-size: 10px;
  line-height: 1.25;
}

.os28-visual {
  position: relative;
}

.os28-map {
  position: relative;
  width: min(100%, 760px);
  aspect-ratio: 1;
  margin-inline: auto;
  isolation: isolate;
}

.os28-field {
  position: absolute;
  inset: 12%;
  z-index: -2;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(191, 232, 255, 0.075), transparent 57%),
    repeating-radial-gradient(
      circle,
      transparent 0 42px,
      rgba(213, 226, 238, 0.035) 43px 44px
    );
  opacity: 0;
  transform: scale(0.92);
  transition:
    opacity 1200ms ease 180ms,
    transform 1600ms var(--ease) 180ms;
}

.os28-connectors {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: rgba(191, 232, 255, 0.16);
  stroke-width: 1;
  opacity: 0;
  transform: scale(0.95);
  transition:
    opacity 1100ms ease 280ms,
    transform 1500ms var(--ease) 280ms;
}

.os28-connectors circle:first-child {
  stroke-dasharray: 2 10;
}

.os28-connectors circle:last-of-type {
  stroke: rgba(213, 226, 238, 0.09);
}

.os28-connectors line {
  stroke-dasharray: 5 9;
}

.os28-section.is-visible .os28-field,
.os28-section.is-visible .os28-connectors {
  opacity: 1;
  transform: scale(1);
}

.os28-core {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 162px;
  aspect-ratio: 1;
  display: grid;
  place-content: center;
  justify-items: center;
  border: 1px solid rgba(191, 232, 255, 0.5);
  border-radius: 50%;
  background:
    radial-gradient(circle at 50% 38%, rgba(191, 232, 255, 0.12), transparent 58%),
    rgba(3, 5, 7, 0.86);
  box-shadow:
    inset 0 0 42px rgba(191, 232, 255, 0.08),
    0 0 64px rgba(127, 212, 255, 0.1);
  transform: translate(-50%, -50%);
  animation: os28-core-pulse 6s ease-in-out infinite;
}

.os28-core::before,
.os28-core::after {
  content: "";
  position: absolute;
  inset: 18px;
  border: 1px solid rgba(213, 226, 238, 0.12);
  border-radius: 50%;
}

.os28-core::after {
  inset: -24px;
  border-style: dashed;
  animation: os28-ring-rotate 42s linear infinite;
}

.os28-core span {
  font-size: 27px;
  font-weight: 300;
}

.os28-core small {
  margin-top: 8px;
  color: var(--blue);
  font-size: 8px;
  font-weight: 600;
}

.os28-node {
  position: absolute;
  width: 118px;
  min-height: 54px;
  display: grid;
  grid-template-columns: 25px 1fr;
  align-items: center;
  gap: 5px;
  padding: 8px 10px;
  border: 1px solid rgba(213, 226, 238, 0.15);
  border-radius: 2px;
  outline: none;
  background: rgba(3, 5, 7, 0.78);
  color: rgba(247, 248, 250, 0.62);
  text-align: left;
  transform: translate(-50%, -50%) scale(0.96);
  transition:
    color 240ms ease,
    border-color 240ms ease,
    background 240ms ease,
    box-shadow 320ms ease,
    transform 340ms var(--ease),
    opacity 600ms ease;
}

.os28-node-1 {
  top: 12.1%;
  left: 50%;
}

.os28-node-2 {
  top: 25%;
  left: 80.3%;
}

.os28-node-3 {
  top: 55.3%;
  left: 88.8%;
}

.os28-node-4 {
  top: 85.5%;
  left: 71.1%;
}

.os28-node-5 {
  top: 85.5%;
  left: 28.9%;
}

.os28-node-6 {
  top: 55.3%;
  left: 11.2%;
}

.os28-node-7 {
  top: 25%;
  left: 19.7%;
}

.os28-node-index {
  color: rgba(191, 232, 255, 0.54);
  font-size: 9px;
}

.os28-node-title {
  font-size: 11px;
  line-height: 1.2;
}

.os28-node:hover,
.os28-node:focus-visible,
.os28-node.is-active {
  border-color: rgba(191, 232, 255, 0.64);
  background: rgba(7, 10, 13, 0.94);
  color: var(--white);
  box-shadow:
    inset 0 0 24px rgba(191, 232, 255, 0.05),
    0 0 26px rgba(127, 212, 255, 0.1);
  transform: translate(-50%, -50%) scale(1.045);
}

.os28-node.is-active::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -7px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 12px var(--blue);
  transform: translateY(-50%);
}

.os28-mobile-list {
  display: none;
}

@keyframes os28-core-pulse {
  0%,
  100% {
    box-shadow:
      inset 0 0 42px rgba(191, 232, 255, 0.08),
      0 0 54px rgba(127, 212, 255, 0.08);
  }
  50% {
    box-shadow:
      inset 0 0 48px rgba(191, 232, 255, 0.12),
      0 0 76px rgba(127, 212, 255, 0.15);
  }
}

@keyframes os28-ring-rotate {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1280px) {
  .os28-shell {
    grid-template-columns: minmax(380px, 0.85fr) minmax(540px, 1.15fr);
    gap: 44px;
  }

  .os28-copy > h2 {
    font-size: 60px;
  }

  .os28-node {
    width: 108px;
  }
}

@media (max-width: 1000px) {
  .os28-section {
    padding: 126px 0 140px;
  }

  .os28-shell {
    grid-template-columns: 1fr;
    gap: 68px;
  }

  .os28-copy {
    max-width: 760px;
  }

  .os28-detail {
    display: none;
  }

  .os28-map {
    width: min(100%, 680px);
  }

  .os28-mobile-list {
    display: grid;
    gap: 0;
    grid-column: 1 / -1;
    border-top: 1px solid var(--line);
  }

  .os28-mobile-card {
    padding: 38px 0;
    border-bottom: 1px solid var(--line);
  }

  .os28-mobile-card-heading {
    display: grid;
    grid-template-columns: 48px 1fr;
    align-items: baseline;
    gap: 16px;
  }

  .os28-mobile-card-heading > span {
    color: var(--blue);
    font-size: 11px;
  }

  .os28-mobile-card h3 {
    margin: 0;
    font-size: 25px;
    font-weight: 400;
  }

  .os28-mobile-card > p {
    max-width: 720px;
    margin: 20px 0 0 64px;
    color: var(--muted);
    font-size: 14px;
    line-height: 1.7;
  }

  .os28-mobile-card .os28-projects {
    margin-left: 64px;
  }
}

@media (max-width: 640px) {
  .os28-section {
    padding: 102px 0 112px;
  }

  .os28-section::before {
    background-size: 48px 48px;
  }

  .os28-copy > .section-label {
    max-width: 260px;
    line-height: 1.5;
  }

  .os28-copy > h2 {
    max-width: 330px;
    font-size: 47px;
    line-height: 1.03;
  }

  .os28-intro {
    font-size: 15px;
    line-height: 1.65;
  }

  .os28-metric {
    max-width: 310px;
    font-size: 9px;
    line-height: 1.6;
  }

  .os28-visual {
    margin-top: -10px;
  }

  .os28-map {
    width: min(100%, 330px);
  }

  .os28-connectors line,
  .os28-nodes {
    display: none;
  }

  .os28-core {
    width: 124px;
  }

  .os28-core span {
    font-size: 23px;
  }

  .os28-mobile-card {
    padding: 34px 0;
  }

  .os28-mobile-card-heading {
    grid-template-columns: 36px 1fr;
    gap: 10px;
  }

  .os28-mobile-card h3 {
    font-size: 22px;
    line-height: 1.2;
  }

  .os28-mobile-card > p,
  .os28-mobile-card .os28-projects {
    margin-left: 46px;
  }

  .os28-mobile-card > p {
    font-size: 13px;
  }

  .os28-mobile-card .os28-projects {
    gap: 6px;
    margin-top: 22px;
  }

  .os28-project-chip {
    min-height: 28px;
    max-width: 100%;
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .os28-core,
  .os28-core::after {
    animation: none;
  }

  .os28-field,
  .os28-connectors,
  .os28-detail,
  .os28-node {
    transition-duration: 0.01ms;
  }
}