/* The language section: the index, the ring of language nodes, the
   connector lines and the wireframe brain. */

.language-section {
  min-height: 100lvh;
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  min-height: var(--app-height, 100dvh);
  padding: 48px 0 86px;
  position: relative;
  overflow: clip;
  color: var(--text);
  background: transparent;
}

.language-section::before,
.language-section::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.language-section::before {
  background-image:
    radial-gradient(circle, color-mix(in srgb, var(--text) 24%, transparent) 0 1px, transparent 1.8px),
    radial-gradient(circle, color-mix(in srgb, var(--text) 10%, transparent) 0 1px, transparent 1.8px);
  background-size: 86px 86px, 132px 132px;
  background-position: 18px 28px, 62px 44px;
  mask-image: radial-gradient(circle at 48% 50%, black 8%, transparent 74%);
  opacity: 0;
}

.language-section::after {
  background:
    linear-gradient(115deg, transparent 0 42%, color-mix(in srgb, var(--text) 5%, transparent) 42.3%, transparent 43%),
    linear-gradient(22deg, transparent 0 58%, color-mix(in srgb, var(--text) 4%, transparent) 58.2%, transparent 59%);
  opacity: 0;
}

html.theme-dark .language-section::before {
  opacity: 0.5;
}

html.theme-dark .language-section::after {
  opacity: 0.62;
}

.language-shell {
  min-height: inherit;
  display: grid;
  place-items: center;
}

.language-universe {
  --universe-x: 0;
  --universe-y: 0;
  position: relative;
  width: min(100%, 1180px);
  min-height: min(800px, calc(var(--app-height, 100dvh) - 80px));
  display: grid;
  grid-template-columns: 56px minmax(660px, 1fr) minmax(300px, 360px);
  align-items: center;
  gap: clamp(24px, 4.4vw, 56px);
  padding: clamp(28px, 5vw, 52px) 0;
  background:
    radial-gradient(circle at 43% 52%, color-mix(in srgb, var(--text) 6%, transparent), transparent 36%),
    radial-gradient(circle at 70% 42%, color-mix(in srgb, var(--text) 3%, transparent), transparent 30%);
  isolation: isolate;
  overflow: visible;
}

.language-universe::before {
  content: "";
  position: absolute;
  inset: 8% 8% 6%;
  background-image:
    linear-gradient(color-mix(in srgb, var(--text) 4%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--text) 4%, transparent) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(circle at 44% 50%, black 12%, transparent 72%);
  opacity: 0.08;
  pointer-events: none;
  z-index: -2;
}

.language-universe::after {
  content: "";
  position: absolute;
  width: min(58vw, 660px);
  height: min(58vw, 660px);
  left: 44%;
  top: 54%;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  background:
    radial-gradient(circle, color-mix(in srgb, var(--text) 8%, transparent), color-mix(in srgb, var(--text) 2.6%, transparent) 48%, transparent 72%);
  opacity: 0.42;
  pointer-events: none;
  z-index: -1;
}

html.theme-dark .language-universe::before {
  opacity: 0.72;
}

html.theme-dark .language-universe::after {
  opacity: 1;
}

.language-index {
  display: grid;
  gap: 18px;
  justify-items: start;
  z-index: 5;
}

.language-index-item {
  all: unset;
  box-sizing: border-box;
  position: relative;
  min-width: 44px;
  padding: var(--space-8) 0;
  color: var(--muted);
  cursor: pointer;
  font-weight: 800;
  font-size: var(--fs-sm);
  letter-spacing: 0.16em;
  transition:
    color 200ms ease,
    transform 200ms ease;
}

.language-index-item::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 2px;
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.36;
  transform-origin: left center;
  transition:
    opacity 200ms ease,
    transform 200ms ease;
}

.language-index-item.is-active {
  color: var(--text);
  transform: translateX(4px);
  outline: none;
}

.language-index-item:hover {
  color: var(--text);
}

.language-index-item:focus-visible {
  color: var(--text);
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

.language-index-item.is-active::after {
  opacity: 0.9;
  transform: scaleX(1.7);
}

.language-stage {
  position: relative;
  min-height: 660px;
  z-index: 2;
  overflow: visible;
  transform: translate3d(
    calc(var(--universe-x) * -8px),
    calc(var(--universe-y) * -8px),
    0
  );
  transition: transform 180ms ease;
}

.language-heading {
  position: relative;
  display: grid;
  gap: 14px;
  max-width: 520px;
  z-index: 5;
  padding: 0 0 0 18px;
  border-left: 1px solid color-mix(in srgb, var(--text) 18%, transparent);
  transform: translate3d(
    calc(var(--universe-x) * -5px),
    calc(var(--universe-y) * -5px),
    0
  );
  transition: transform 180ms ease;
}

.language-section-title {
  margin: 0;
  max-width: 11ch;
  font-size: clamp(2.35rem, 4.5vw, 4.5rem);
  line-height: 1;
  color: var(--text);
  text-shadow: 0 12px 34px color-mix(in srgb, var(--text) 8%, transparent);
  text-wrap: balance;
  overflow-wrap: anywhere;
  white-space: pre-line;
}

html[lang="en"] .language-section-title {
  max-width: 12ch;
  font-size: clamp(2.25rem, 4.2vw, 4.25rem);
}

html[lang="ja"] .language-section-title {
  max-width: 13ch;
  font-size: clamp(2.2rem, 4.1vw, 4.1rem);
}

.language-network {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 6;
  pointer-events: none;
  overflow: visible;
  opacity: 1;
  transform: none;
  transition: none;
}

.network-line {
  stroke: color-mix(in srgb, var(--text) 74%, transparent);
  stroke-width: 0.36;
  stroke-linecap: round;
  opacity: 0.74;
  filter: drop-shadow(0 0 8px color-mix(in srgb, var(--text) 18%, transparent));
  transition:
    opacity 220ms ease,
    stroke 220ms ease,
    stroke-width 220ms ease;
}

.language-universe.active-cpp .line-cpp,
.language-universe.active-html .line-html,
.language-universe.active-css .line-css,
.language-universe.active-js .line-js,
.language-universe.active-py .line-py {
  opacity: 0.95;
  stroke: var(--text);
  stroke-width: 0.48;
  filter:
    drop-shadow(0 0 8px color-mix(in srgb, var(--text) 36%, transparent));
}

.brain-wrap {
  position: absolute;
  left: 50%;
  top: 64%;
  width: clamp(540px, 54vw, 720px);
  --brain-wrap-offset-x: 0px;
  aspect-ratio: 2 / 1;
  display: grid;
  place-items: center;
  transform:
    translate(calc(-50% + var(--brain-wrap-offset-x)), -50%)
    translate3d(calc(var(--universe-x) * 8px), calc(var(--universe-y) * 8px), 0)
    scale(1);
  opacity: 1;
  transition: transform 180ms ease;
  z-index: 3;
  animation: brainFloat 9s ease-in-out infinite;
  pointer-events: none;
  user-select: none;
  -webkit-user-select: none;
  overflow: visible;
}

.language-universe.active-cpp .brain-wrap,
.language-universe.active-html .brain-wrap,
.language-universe.active-css .brain-wrap,
.language-universe.active-js .brain-wrap,
.language-universe.active-py .brain-wrap {
  filter: drop-shadow(0 0 16px rgba(255, 255, 255, 0.12));
}

.brain-three-mount {
  position: relative;
  width: 116%;
  height: 122%;
  overflow: visible;
  background: transparent;
  box-shadow: none;
  pointer-events: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.brain-three-mount::before {
  content: none;
}

.brain-three-mount canvas {
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  height: 100%;
  background: transparent;
  pointer-events: none;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.language-node-field {
  position: absolute;
  inset: 0;
  z-index: 7;
  pointer-events: none;
}

.language-node {
  all: unset;
  box-sizing: border-box;
  position: absolute;
  min-width: clamp(94px, 9vw, 136px);
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  padding: 0 var(--space-16);
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--text) 18%, transparent);
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--surface-strong) 92%, transparent), color-mix(in srgb, var(--surface) 70%, transparent));
  box-shadow:
    0 18px 34px color-mix(in srgb, var(--text) 8%, transparent),
    inset 0 1px 0 color-mix(in srgb, white 18%, transparent);
  color: var(--text);
  cursor: pointer;
  pointer-events: auto;
  opacity: 1;
  translate: 0 0;
  transform:
    translate(-50%, -50%)
    translate3d(
      calc(var(--universe-x) * var(--node-depth-x, 10px)),
      calc(var(--universe-y) * var(--node-depth-y, 10px)),
      0
    )
    scale(1);
  transition:
    transform 220ms ease,
    opacity 420ms ease,
    color 220ms ease,
    border-color 220ms ease,
    box-shadow 220ms ease,
    background 220ms ease;
  animation: none;
}

.node-label {
  position: relative;
  z-index: 1;
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: clamp(0.9rem, 1.35vw, 1.02rem);
}

.node-index {
  position: relative;
  z-index: 1;
  color: var(--muted);
  font-size: var(--fs-2xs);
  font-weight: 800;
  letter-spacing: 0.12em;
}

.language-node.is-active {
  color: var(--text);
  background:
    linear-gradient(145deg, color-mix(in srgb, var(--surface-strong) 100%, white 12%), color-mix(in srgb, var(--surface) 80%, transparent));
  border-color: color-mix(in srgb, var(--text) 58%, transparent);
  box-shadow:
    0 18px 42px color-mix(in srgb, var(--text) 10%, transparent),
    0 0 0 7px color-mix(in srgb, var(--text) 5%, transparent),
    0 0 22px color-mix(in srgb, var(--text) 10%, transparent),
    inset 0 1px 0 color-mix(in srgb, white 22%, transparent);
  outline: none;
}

.language-node:hover,
.language-node:focus-visible {
  color: var(--text);
  border-color: color-mix(in srgb, var(--text) 58%, transparent);
  box-shadow:
    0 18px 42px color-mix(in srgb, var(--text) 10%, transparent),
    0 0 0 7px color-mix(in srgb, var(--text) 5%, transparent),
    0 0 22px color-mix(in srgb, var(--text) 10%, transparent),
    inset 0 1px 0 color-mix(in srgb, white 22%, transparent);
  transform:
    translate(-50%, -50%)
    translate3d(
      calc(var(--universe-x) * var(--node-depth-x, 10px)),
      calc(var(--universe-y) * var(--node-depth-y, 10px)),
      0
    )
    scale(1.06);
}

/* The shared hover/focus treatment above is a glow, which reads as ambience
   rather than "you are here". Keyboard focus gets an explicit ring on top. */
.language-node:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

.node-cpp {
  left: 14%;
  top: 60%;
  --node-depth-x: -15px;
  --node-depth-y: -9px;
  animation-delay: -0.6s;
  transition-delay: 180ms;
}

.node-html {
  left: 86%;
  top: 60%;
  --node-depth-x: 13px;
  --node-depth-y: -14px;
  animation-delay: -1.2s;
  transition-delay: 250ms;
}

.node-css {
  left: 28%;
  top: 78%;
  --node-depth-x: -11px;
  --node-depth-y: 16px;
  animation-delay: -2.1s;
  transition-delay: 320ms;
}

.node-js {
  left: 72%;
  top: 78%;
  --node-depth-x: 16px;
  --node-depth-y: 12px;
  animation-delay: -2.7s;
  transition-delay: 390ms;
}

.node-py {
  left: 50%;
  top: 40%;
  --node-depth-x: 0px;
  --node-depth-y: 18px;
  animation-delay: -3.1s;
  transition-delay: 460ms;
}

.language-insight {
  position: relative;
  width: 100%;
  padding: 26px;
  border: 1px solid color-mix(in srgb, var(--line) 78%, transparent);
  border-radius: 22px;
  background:
    linear-gradient(150deg, color-mix(in srgb, var(--surface-strong) 88%, transparent), color-mix(in srgb, var(--surface) 68%, transparent)),
    color-mix(in srgb, var(--surface) 72%, transparent);
  box-shadow:
    0 28px 56px color-mix(in srgb, var(--text) 7%, transparent),
    0 0 38px color-mix(in srgb, var(--text) 4%, transparent),
    inset 0 1px 0 color-mix(in srgb, white 18%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  transform: translate3d(
    calc(var(--universe-x) * 5px),
    calc(var(--universe-y) * 5px),
    0
  );
  z-index: 4;
  transition: transform 180ms ease;
}

.language-insight-kicker {
  margin: 0 0 var(--space-8);
  color: color-mix(in srgb, var(--text) 72%, transparent);
  font-size: var(--fs-2xs);
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.language-insight h3 {
  margin: 0;
  font-size: var(--fs-xl);
  line-height: 1.1;
  color: var(--text);
}

[data-language-insight-text] {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: var(--fs-md);
  line-height: 1.65;
}

.language-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
  margin-top: 18px;
}

.language-tags span {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 11px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--text) 14%, transparent);
  background: color-mix(in srgb, var(--surface-strong) 44%, transparent);
  color: color-mix(in srgb, var(--text) 78%, transparent);
  font-size: var(--fs-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
}

@keyframes brainFloat {
  0%,
  100% {
    translate: 0 0;
  }
  25% {
    translate: 5px -5px;
  }
  50% {
    translate: -4px -10px;
  }
  75% {
    translate: 4px -4px;
  }
}