/* Home navigation layout and decorative illustrations. */
html,
body {
  min-height: 100%;
}

body {
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  overflow: hidden;
}

.debug-background {
  position: fixed;
  inset: -46vmax;
  z-index: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(24px, 4vh, 50px);
  overflow: hidden;
  pointer-events: none;
  transform: rotate(-30deg);
}

.debug-line {
  display: flex;
  width: max-content;
  color: rgba(200, 255, 221, 0.075);
  font: 900 clamp(26px, 4.9vw, 76px) / 1 var(--ui-font);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  animation: debugLineForward 42s linear infinite;
  will-change: transform;
}

.debug-line:nth-child(even) {
  color: rgba(70, 255, 120, 0.055);
  animation-name: debugLineBackward;
  animation-duration: 46s;
}

.debug-line span {
  flex: 0 0 auto;
  padding-right: 0.8em;
}

@keyframes debugLineForward {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    transform: translate3d(-50%, 0, 0);
  }
}

@keyframes debugLineBackward {
  from {
    transform: translate3d(-50%, 0, 0);
  }

  to {
    transform: translate3d(0, 0, 0);
  }
}

main {
  position: relative;
  z-index: 1;
  display: grid;
  flex: 1 1 auto;
  place-items: center;
  min-height: 0;
  padding: clamp(18px, 4vw, 38px);
}

.navigation-section {
  width: min(100%, 900px);
}

.home-footer {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 18px;
  width: 100%;
  padding: 0 clamp(18px, 4vw, 38px) 16px;
}

.service-note {
  max-width: 760px;
  margin: 0;
  color: var(--ui-text-soft);
  font-size: 12px;
  line-height: 1.5;
  text-align: left;
}

.footer-link-groups,
.footer-links {
  display: flex;
  align-items: center;
}

.footer-link-groups {
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
}

.footer-links {
  --ui-link-color: var(--ui-text-soft);

  gap: 14px;
  font-size: 12px;
}

.nav-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  width: 100%;
}

.nav-card {
  position: relative;
  isolation: isolate;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: clamp(150px, 23vh, 210px);
  padding: clamp(22px, 4vw, 36px);
  overflow: hidden;
  border: 1px solid var(--ui-border);
  border-radius: var(--ui-radius);
  background: var(--ui-surface-overlay);
  box-shadow: var(--ui-shadow);
  color: var(--ui-text);
  text-align: center;
  text-decoration: none;
  transition:
    background 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease,
    transform 140ms ease;
}

.nav-card:hover,
.nav-card:focus-visible {
  background: var(--ui-surface-hover);
  box-shadow: var(--ui-shadow-raised);
  transform: translateY(-2px);
}

.nav-card:focus-visible {
  border-color: var(--ui-border-active);
}

.nav-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(26, 188, 156, 0.1),
    transparent
  );
  transition: left 0.6s ease;
}

.nav-card:hover::before,
.nav-card:focus-visible::before {
  left: 100%;
}

.nav-card > :not(.card-visual) {
  position: relative;
  z-index: 2;
}

.avr-card,
.uart-card {
  isolation: isolate;
}

.card-visual {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 16px 18px;
  opacity: 0;
  transition: opacity 0.32s ease;
}

.card-visual::before {
  content: "";
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(35, 214, 156, 0.22) 0%,
    rgba(35, 214, 156, 0.12) 38%,
    transparent 74%
  );
  filter: blur(18px);
  opacity: 0;
  transition: opacity 0.42s ease;
}

.avr-card:hover .card-visual,
.avr-card:focus-visible .card-visual,
.uart-card:hover .card-visual,
.uart-card:focus-visible .card-visual {
  opacity: 1;
}

.avr-card:hover .card-visual::before,
.avr-card:focus-visible .card-visual::before,
.uart-card:hover .card-visual::before,
.uart-card:focus-visible .card-visual::before {
  opacity: 1;
}

.uart-visual {
  align-items: flex-end;
  justify-content: flex-end;
}

.uart-visual::before {
  right: 18px;
  bottom: 18px;
  width: 142px;
  height: 92px;
  border-radius: 28px;
  background: radial-gradient(
    ellipse at center,
    rgba(79, 208, 184, 0.18) 0%,
    rgba(79, 208, 184, 0.1) 38%,
    transparent 76%
  );
  filter: blur(16px);
}

.connector-scene {
  position: relative;
  width: 160px;
  height: 78px;
  opacity: 0.5;
  filter: blur(1.2px);
  transform: translate3d(0, 8px, 0) scale(0.97);
  transform-origin: bottom right;
  transition:
    transform 0.42s ease,
    opacity 0.42s ease,
    filter 0.42s ease;
}

.uart-card:hover .connector-scene,
.uart-card:focus-visible .connector-scene {
  opacity: 0.8;
  filter: blur(0.8px);
  transform: translate3d(0, 0, 0) scale(1);
}

.connector-bridge {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 22px;
  height: 10px;
  border-radius: 999px;
  transform: translate(-50%, -50%) scaleX(0.35);
  background: linear-gradient(
    90deg,
    rgba(150, 255, 228, 0.12) 0%,
    rgba(120, 247, 208, 0.38) 50%,
    rgba(150, 255, 228, 0.12) 100%
  );
  box-shadow: 0 0 12px rgba(93, 240, 194, 0.16);
  opacity: 0;
  transition:
    opacity 0.22s ease 0.72s,
    transform 0.2s ease 0.72s;
}

.uart-card:hover .connector-bridge,
.uart-card:focus-visible .connector-bridge {
  opacity: 0.92;
  transform: translate(-50%, -50%) scaleX(1);
}

.connector {
  position: absolute;
  top: 50%;
  width: 74px;
  height: 44px;
  transform: translateY(-50%);
}

.connector-left {
  left: 0;
  transform: translate(-18px, -50%);
  transition: transform 0.96s cubic-bezier(0.22, 0.72, 0.18, 1);
}

.connector-right {
  right: 0;
  transform: translate(18px, -50%);
  transition: transform 0.96s cubic-bezier(0.22, 0.72, 0.18, 1);
}

.connector-cable,
.connector-shell,
.connector-head,
.connector-tip,
.connector-notch {
  position: absolute;
}

.connector-cable {
  top: 50%;
  height: 8px;
  transform: translateY(-50%);
  border-radius: 999px;
  background: linear-gradient(
    90deg,
    rgba(111, 192, 178, 0.08) 0%,
    rgba(123, 214, 197, 0.16) 100%
  );
}

.connector-left .connector-cable {
  left: -999px;
  right: 28px;
}

.connector-right .connector-cable {
  left: 28px;
  right: -999px;
}

.connector-shell {
  top: 50%;
  width: 34px;
  height: 24px;
  border-radius: 10px;
  transform: translateY(-50%);
  background: linear-gradient(
    180deg,
    rgba(71, 124, 125, 0.22) 0%,
    rgba(39, 74, 78, 0.16) 100%
  );
  box-shadow:
    inset 0 0 0 1px rgba(142, 244, 217, 0.08),
    inset 0 0 10px rgba(91, 196, 176, 0.08);
}

.connector-left .connector-shell {
  right: 10px;
}

.connector-right .connector-shell {
  left: 10px;
}

.connector-head {
  top: 50%;
  width: 22px;
  height: 16px;
  border-radius: 7px;
  transform: translateY(-50%);
  background: linear-gradient(
    180deg,
    rgba(96, 168, 160, 0.24) 0%,
    rgba(51, 99, 103, 0.16) 100%
  );
  box-shadow: inset 0 0 0 1px rgba(150, 241, 220, 0.07);
}

.connector-left .connector-head {
  right: 0;
}

.connector-right .connector-head {
  left: 0;
}

.connector-tip {
  top: 50%;
  width: 12px;
  height: 10px;
  border-radius: 4px;
  transform: translateY(-50%);
  background: linear-gradient(
    180deg,
    rgba(169, 255, 230, 0.24) 0%,
    rgba(104, 219, 187, 0.16) 100%
  );
  box-shadow: 0 0 8px rgba(106, 238, 197, 0.08);
  transition:
    transform 0.16s ease 0s,
    opacity 0.22s ease;
}

.connector-left .connector-tip {
  right: -2px;
}

.connector-right .connector-tip {
  left: -2px;
}

.connector-notch {
  top: 50%;
  width: 3px;
  height: 16px;
  border-radius: 999px;
  transform: translateY(-50%);
  background: rgba(178, 255, 231, 0.12);
}

.connector-left .connector-notch {
  right: 18px;
}

.connector-right .connector-notch {
  left: 18px;
}

.uart-card:hover .connector-left,
.uart-card:focus-visible .connector-left {
  transform: translate(8px, -50%);
}

.uart-card:hover .connector-right,
.uart-card:focus-visible .connector-right {
  transform: translate(-8px, -50%);
}

.uart-card:hover .connector-left .connector-tip,
.uart-card:focus-visible .connector-left .connector-tip {
  transform: translate(8px, -50%);
  transition-delay: 0.7s;
}

.uart-card:hover .connector-right .connector-tip,
.uart-card:focus-visible .connector-right .connector-tip {
  transform: translate(-8px, -50%);
  transition-delay: 0.7s;
}

.binary-streams {
  position: absolute;
  inset: -8px;
  overflow: hidden;
  opacity: 0;
  transition: opacity 0.4s ease 0.86s;
  mask-image: radial-gradient(
    ellipse at 68% 58%,
    rgba(0, 0, 0, 0.92) 0%,
    rgba(0, 0, 0, 0.72) 42%,
    transparent 100%
  );
}

.uart-card:hover .binary-streams,
.uart-card:focus-visible .binary-streams {
  opacity: 0.58;
}

.binary-line {
  position: absolute;
  left: -18%;
  width: 150%;
  white-space: nowrap;
  font-family: var(--ui-font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: rgba(132, 247, 214, 0.16);
  text-shadow: 0 0 10px rgba(84, 224, 185, 0.1);
  filter: blur(1.4px);
  will-change: transform;
}

.binary-line:nth-child(1) {
  top: 8px;
  animation: binaryDriftOne 2.8s linear infinite;
}

.binary-line:nth-child(2) {
  top: 25px;
  animation: binaryDriftTwo 3.3s linear infinite;
}

.binary-line:nth-child(3) {
  top: 42px;
  animation: binaryDriftThree 2.5s linear infinite;
}

.binary-line:nth-child(4) {
  top: 59px;
  animation: binaryDriftFour 3.1s linear infinite;
}

@keyframes binaryDriftOne {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-82px);
  }
}

@keyframes binaryDriftTwo {
  from {
    transform: translateX(-46px);
  }

  to {
    transform: translateX(24px);
  }
}

@keyframes binaryDriftThree {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(-64px);
  }
}

@keyframes binaryDriftFour {
  from {
    transform: translateX(-28px);
  }

  to {
    transform: translateX(34px);
  }
}

.card-visual-chip {
  position: relative;
  width: 112px;
  height: 112px;
  opacity: 0.44;
  filter: blur(1.6px);
  transform: translate3d(0, 8px, 0) scale(0.96);
  transition:
    transform 0.42s ease,
    opacity 0.42s ease,
    filter 0.42s ease;
}

.avr-card:hover .card-visual-chip,
.avr-card:focus-visible .card-visual-chip {
  opacity: 0.72;
  filter: blur(1px);
  transform: translate3d(0, 0, 0) scale(1);
}

.chip-pins-x,
.chip-pins-y,
.chip-core,
.chip-window,
.chip-fill,
.chip-fill-wave {
  position: absolute;
}

.chip-pins-x,
.chip-pins-y {
  inset: 0;
}

.chip-pins-x::before,
.chip-pins-x::after,
.chip-pins-y::before,
.chip-pins-y::after {
  content: "";
  position: absolute;
  opacity: 0.68;
}

.chip-pins-x::before,
.chip-pins-x::after {
  top: 50%;
  height: 72px;
  transform: translateY(-50%);
  background:
    repeating-linear-gradient(
      to bottom,
      rgba(108, 190, 173, 0.13) 0 6px,
      transparent 6px 14px
    );
}

.chip-pins-x::before {
  right: calc(100% - 10px);
  width: 999px;
}

.chip-pins-x::after {
  left: calc(100% - 10px);
  width: 999px;
}

.chip-pins-y::before,
.chip-pins-y::after {
  left: 50%;
  width: 72px;
  transform: translateX(-50%);
  background:
    repeating-linear-gradient(
      to right,
      rgba(108, 190, 173, 0.13) 0 6px,
      transparent 6px 14px
    );
}

.chip-pins-y::before {
  bottom: calc(100% - 10px);
  height: 999px;
}

.chip-pins-y::after {
  top: calc(100% - 10px);
  height: 999px;
}

.chip-core {
  inset: 16px;
  border-radius: 26px;
  background: linear-gradient(
    180deg,
    rgba(56, 98, 97, 0.18) 0%,
    rgba(33, 61, 64, 0.14) 100%
  );
  box-shadow:
    inset 0 0 0 11px rgba(88, 154, 143, 0.18),
    inset 0 0 16px rgba(106, 201, 180, 0.08),
    0 0 0 1px rgba(154, 255, 231, 0.05);
}

.chip-window {
  inset: 18px;
  overflow: hidden;
  border-radius: 16px;
  background: rgba(214, 252, 244, 0.032);
}

.chip-fill {
  left: 0;
  right: 0;
  bottom: 0;
  height: 0%;
  opacity: 0;
  background: linear-gradient(
    180deg,
    rgba(91, 255, 192, 0.88) 0%,
    rgba(32, 193, 129, 0.68) 48%,
    rgba(16, 133, 94, 0.6) 100%
  );
  box-shadow:
    0 0 18px rgba(44, 214, 151, 0.18),
    inset 0 1px 0 rgba(215, 255, 242, 0.4);
  transition:
    height 1.65s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.5s ease;
}

.chip-fill-wave {
  top: -12px;
  left: -8%;
  width: 116%;
  height: 20px;
  background:
    radial-gradient(
      ellipse at 12px 16px,
      rgba(198, 255, 230, 0.96) 0 9px,
      transparent 10px
    )
    0 0 / 28px 20px repeat-x;
  opacity: 0.88;
}

.avr-card:hover .chip-fill,
.avr-card:focus-visible .chip-fill {
  height: 100%;
  opacity: 0.88;
}

.card-title {
  margin: 0 0 10px;
  color: var(--ui-accent);
  font-size: clamp(38px, 6vw, 72px);
  font-weight: 900;
  line-height: 0.92;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.card-description {
  margin: 0;
  color: var(--ui-text-soft);
  font-size: clamp(15px, 2vw, 18px);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: 0;
}

@media (max-width: 720px) {
  body {
    overflow-y: auto;
  }

  main {
    min-height: 0;
    align-items: center;
  }

  .home-footer {
    grid-template-columns: 1fr;
    padding-top: 16px;
  }

  .service-note {
    text-align: center;
  }

  .footer-link-groups,
  .footer-links {
    justify-content: center;
  }

  .nav-grid {
    grid-template-columns: 1fr;
  }

  .nav-card {
    min-height: 132px;
  }

  .card-visual {
    padding: 10px 12px;
  }

  .card-visual-chip {
    width: 92px;
    height: 92px;
  }

  .chip-pins-x::before,
  .chip-pins-x::after {
    height: 60px;
  }

  .chip-pins-y::before,
  .chip-pins-y::after {
    width: 60px;
  }

  .connector-scene {
    width: 132px;
    height: 66px;
  }

  .binary-line {
    font-size: 9px;
    letter-spacing: 0.22em;
  }

  .binary-line:nth-child(2) {
    top: 22px;
  }

  .binary-line:nth-child(3) {
    top: 36px;
  }

  .binary-line:nth-child(4) {
    top: 50px;
  }

  .connector {
    width: 62px;
    height: 38px;
  }

  .connector-shell {
    width: 28px;
    height: 20px;
  }

  .connector-head {
    width: 18px;
    height: 13px;
  }

  .connector-tip {
    width: 10px;
    height: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .debug-line,
  .binary-line {
    animation: none;
  }

  .nav-card::before,
  .card-visual,
  .card-visual::before,
  .card-visual-chip,
  .chip-fill,
  .connector-scene,
  .connector-left,
  .connector-right,
  .connector-tip,
  .connector-bridge,
  .binary-streams {
    transition-duration: 0.01ms;
  }
}