*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--ink-950);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  background:
    radial-gradient(1200px 900px at 12% -10%, var(--ink-700), transparent 62%),
    radial-gradient(900px 700px at 100% 20%, var(--ink-800), transparent 60%),
    var(--ink-950);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: var(--size-body);
  font-weight: var(--weight-regular);
  line-height: var(--line-height-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

button {
  border: 0;
  background: none;
  color: inherit;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: var(--size-sm);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
}

a {
  color: inherit;
}

h1,
h2,
h3,
p,
dl,
dd {
  margin: 0;
}

[hidden] {
  display: none !important;
}

::selection {
  background: var(--accent);
  color: var(--ink-950);
}

.app-shell {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: 100vh;
  flex-direction: column;
  padding: var(--space-5) clamp(var(--space-4), 4vw, var(--space-7)) var(--space-4);
}

.ambient {
  position: fixed;
  z-index: 0;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.ambient::before {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 72px 72px;
  content: "";
  mask-image: radial-gradient(circle at 50% 28%, black, transparent 76%);
  opacity: 0.16;
}

.ambient__orb {
  position: absolute;
  border-radius: var(--radius-round);
  filter: blur(90px);
  opacity: 0.24;
}

.ambient__orb--one {
  width: 44vw;
  height: 44vw;
  top: -18vw;
  left: -12vw;
  background: var(--beam-cyan);
}

.ambient__orb--two {
  width: 38vw;
  height: 38vw;
  right: -14vw;
  bottom: -20vw;
  background: var(--beam-magenta);
}

.ambient__orb--three {
  width: 30vw;
  height: 30vw;
  top: 40%;
  left: 50%;
  background: var(--accent);
  opacity: 0.1;
}

.stage {
  width: min(100%, var(--shell-width));
  margin: 0 auto;
  flex: 1;
}

.topbar {
  display: flex; width: min(100%, var(--shell-width)); margin: 0 auto var(--space-6);
  align-items: center; justify-content: space-between; gap: var(--space-4);
}

.brand { display: inline-flex; align-items: center; gap: var(--space-3); padding: 0; text-align: left; }

.brand__mark {
  position: relative; display: grid; width: 34px; height: 34px; place-items: center;
  border: 1px solid var(--line-strong); border-radius: 11px; transform: rotate(45deg);
}

.brand__mark::before, .brand__mark::after {
  position: absolute; background: var(--beam-cyan); content: "";
}

.brand__mark::before { width: 18px; height: 1px; box-shadow: 0 0 8px var(--beam-cyan-soft); }

.brand__mark::after { width: 5px; height: 5px; border-radius: var(--radius-round); box-shadow: 0 0 10px var(--beam-cyan); }

.brand__word {
  font-family: var(--font-display); font-size: var(--size-sm);
  font-weight: var(--weight-bold); letter-spacing: var(--tracking-wide); white-space: nowrap;
}

.brand__word span { color: var(--muted); }
.topbar__meta { display: flex; align-items: center; gap: var(--space-3); }
.topbar__chapter {
  color: var(--faint); font-family: var(--font-mono);
  font-size: var(--size-2xs); letter-spacing: var(--tracking-mid);
}

.screen {
  animation: screen-in var(--speed-slow) var(--ease-out) both;
}

.screen h1:focus,
.screen h2:focus {
  outline: none;
}

.screen--title {
  display: grid;
  min-height: calc(100vh - 172px);
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: clamp(var(--space-5), 6vw, var(--space-9));
  padding: var(--space-5) 0 var(--space-7);
}

.title-copy {
  max-width: 740px;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.eyebrow__line {
  display: inline-block;
  width: 44px;
  height: 1px;
  background: linear-gradient(90deg, var(--beam-cyan), transparent);
}

.title-copy h1 {
  max-width: 11ch;
  margin-top: var(--space-4);
  font-family: var(--font-display);
  font-size: var(--display-xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.055em;
  line-height: var(--line-height-display);
}

.title-copy h1 em {
  background: linear-gradient(100deg, var(--beam-cyan), var(--accent-strong) 52%, var(--beam-magenta));
  background-clip: text;
  color: transparent;
  font-style: normal;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lede {
  max-width: 52ch;
  margin-top: var(--space-5);
  color: var(--muted);
  font-size: var(--size-lg);
  line-height: 1.7;
}

.title-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0 var(--space-5);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: transparent;
  color: var(--paper);
  font-size: var(--size-sm);
  font-weight: var(--weight-semibold);
  transition:
    border-color var(--speed-fast) var(--ease-out),
    background var(--speed-fast) var(--ease-out),
    color var(--speed-fast) var(--ease-out),
    transform var(--speed-fast) var(--ease-out),
    box-shadow var(--speed-fast) var(--ease-out);
}

.button:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.button:active {
  transform: scale(0.975);
}

.button:focus-visible,
.icon-button:focus-visible,
.ghost-button:focus-visible,
.brand:focus-visible {
  outline: 2px solid var(--beam-cyan);
  outline-offset: 3px;
}

.button--primary {
  border-color: transparent;
  background: var(--paper);
  box-shadow: 0 0 0 1px var(--paper-soft) inset, 0 14px 34px var(--ink-950);
  color: var(--ink-950);
}

.button--primary:hover {
  background: var(--accent-strong);
  box-shadow: 0 0 42px var(--accent-soft), 0 16px 38px var(--ink-950);
}

.button--quiet {
  background: var(--glass-soft);
  backdrop-filter: blur(16px);
}

.button--quiet:hover {
  background: var(--accent-soft);
}

.title-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--line);
}

.title-stats div {
  min-width: 82px;
}

.title-stats dt {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
  text-transform: uppercase;
}

.title-stats dd {
  margin-top: var(--space-1);
  color: var(--paper-soft);
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
}

.title-art {
  position: relative;
  width: min(100%, 620px);
  aspect-ratio: 1;
  justify-self: end;
}

.prism-graphic {
  position: relative;
  z-index: 2;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.hero-ring {
  fill: none;
  stroke: var(--line-strong);
  stroke-dasharray: 3 12;
  stroke-width: 0.8;
  transform-origin: 260px 260px;
  animation: orbit-spin 34s linear infinite;
}

.hero-ring--inner {
  stroke: var(--line);
  stroke-dasharray: 1 9;
  animation-direction: reverse;
  animation-duration: 24s;
}

.hero-beam {
  fill: none;
  stroke-dasharray: 2 16;
  stroke-linecap: round;
  stroke-width: 1.6;
  animation: beam-travel 5s linear infinite;
}

.hero-beam--cyan {
  filter: drop-shadow(0 0 9px var(--beam-cyan));
  stroke: var(--beam-cyan);
}

.hero-beam--magenta {
  animation-delay: -2.2s;
  filter: drop-shadow(0 0 9px var(--beam-magenta));
  stroke: var(--beam-magenta);
}

.hero-prism {
  fill: url("#prism-gradient");
  opacity: 0.2;
  stroke: var(--beam-cyan);
  stroke-width: 1;
}

.grad-stop-cyan {
  stop-color: var(--beam-cyan);
}

.grad-stop-magenta {
  stop-color: var(--beam-magenta);
}

.prism-orbit { position: absolute; border: 1px solid var(--line); border-radius: var(--radius-round); pointer-events: none; }

.prism-orbit--a { inset: 3%; border-style: dashed; animation: orbit-spin 90s linear infinite; }

.prism-orbit--b { inset: 15%; border-color: var(--line-strong); animation: orbit-spin 64s linear infinite reverse; }

.prism-core {
  position: absolute; z-index: 3; top: 50%; left: 50%; width: 26%; height: 26%;
  border: 1px solid var(--line-strong);
  background: linear-gradient(135deg, var(--beam-cyan), var(--accent), var(--beam-magenta));
  box-shadow: 0 0 60px var(--beam-cyan-soft), 0 0 120px var(--beam-magenta-soft), var(--shadow-panel);
  transform: translate(-50%, -50%) rotate(45deg);
  animation: core-breathe 6s ease-in-out infinite;
}

.prism-core span { position: absolute; inset: 12%; background: var(--ink-900); }

.art-caption {
  position: absolute; z-index: 4; right: 4%; bottom: 2%; color: var(--faint);
  font-family: var(--font-mono); font-size: var(--size-2xs); letter-spacing: var(--tracking-mid); text-transform: uppercase;
}

.art-caption strong { color: var(--beam-cyan); font-weight: var(--weight-medium); }

.screen--chambers { padding-bottom: var(--space-7); }

.section-heading {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: var(--space-5); margin-bottom: var(--space-5);
}

.section-heading h2 {
  margin-top: var(--space-2); font-family: var(--font-display); font-size: var(--display-lg);
  font-weight: var(--weight-bold); letter-spacing: -0.04em; line-height: var(--line-height-display);
}

.ghost-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 var(--space-4);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--glass-soft);
  color: var(--paper-soft);
  font-size: var(--size-sm);
  font-weight: var(--weight-medium);
  white-space: nowrap;
  transition:
    border-color var(--speed-fast) var(--ease-out),
    background var(--speed-fast) var(--ease-out);
}

.ghost-button:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.howto-compact {
  display: none;
}

.chamber-progress {
  display: grid;
  grid-template-columns: auto minmax(120px, 1fr) auto;
  align-items: center;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  padding: var(--space-4) var(--space-5);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(18px);
}

.chamber-progress__label,
.chamber-progress__value {
  color: var(--muted); font-family: var(--font-mono);
  font-size: var(--size-2xs); letter-spacing: var(--tracking-mid); text-transform: uppercase;
}

.progress-track { height: 5px; overflow: hidden; border-radius: var(--radius-round); background: var(--ink-700); }

#chamber-progress-fill {
  display: block; width: 0; height: 100%; border-radius: inherit;
  background: linear-gradient(90deg, var(--beam-cyan), var(--accent), var(--beam-magenta));
  box-shadow: 0 0 18px var(--beam-cyan-soft);
  transition: width var(--speed-slow) var(--ease-out);
}

.chamber-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }

.chamber-card {
  position: relative;
  display: flex;
  width: 100%;
  min-height: 238px;
  flex-direction: column;
  align-items: flex-start;
  padding: var(--space-5);
  overflow: hidden;
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-md);
  background:
    radial-gradient(120% 100% at 100% 0, var(--accent-soft), transparent 58%),
    linear-gradient(160deg, var(--glass-soft), var(--glass));
  text-align: left;
  transition:
    transform var(--speed-mid) var(--ease-out),
    border-color var(--speed-mid) var(--ease-out),
    box-shadow var(--speed-mid) var(--ease-out);
}

.chamber-card-item {
  display: flex;
  min-width: 0;
}

.chamber-card::before {
  position: absolute;
  inset: 0;
  background: radial-gradient(80% 90% at 20% 100%, var(--beam-cyan-soft), transparent 62%);
  content: "";
  opacity: 0;
  transition: opacity var(--speed-mid) var(--ease-out);
}

.chamber-card:hover:not(:disabled) {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-panel), 0 0 40px var(--beam-cyan-soft);
  transform: translateY(-6px);
}

.chamber-card:hover:not(:disabled)::before {
  opacity: 0.75;
}

.chamber-card:focus-visible {
  outline: 2px solid var(--beam-cyan);
  outline-offset: 3px;
}

.chamber-card__top,
.chamber-card__footer {
  position: relative;
  z-index: 1;
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.chamber-card__number {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
}

.chamber-card__name {
  position: relative;
  z-index: 1;
  display: block;
  margin-top: var(--space-5);
  font-family: var(--font-display);
  font-size: var(--display-sm);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.chamber-card__subtitle {
  position: relative;
  z-index: 1;
  display: block;
  max-width: 28ch;
  margin-top: var(--space-2);
  color: var(--muted);
  font-size: var(--size-sm);
  line-height: 1.5;
}

.chamber-card__footer {
  margin-top: auto;
  padding-top: var(--space-5);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
}

.chamber-card.is-complete {
  border-color: var(--line-strong);
}

.chamber-card.is-complete::after {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 7px;
  height: 7px;
  border-radius: var(--radius-round);
  background: var(--success);
  box-shadow: 0 0 14px var(--success);
  content: "";
}

.chamber-card.is-locked {
  cursor: not-allowed;
  filter: saturate(0.35);
  opacity: 0.62;
}

.chamber-card.is-locked:hover {
  border-color: var(--line);
  box-shadow: none;
  transform: none;
}

.stars {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  color: var(--faint);
  font-size: var(--size-sm);
  letter-spacing: 0.04em;
  line-height: 1;
}

.star {
  color: var(--faint);
  transition: color var(--speed-fast) var(--ease-out), text-shadow var(--speed-fast) var(--ease-out);
}

.star.is-earned {
  color: var(--gold);
  text-shadow: 0 0 12px var(--gold-soft);
}

.screen--game {
  padding-bottom: var(--space-4);
}

.game-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  margin-bottom: var(--space-5);
}

.game-head__id {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.game-head__id h2 {
  margin-top: var(--space-1);
  font-family: var(--font-display);
  font-size: var(--display-md);
  font-weight: var(--weight-bold);
  letter-spacing: -0.035em;
  line-height: 1;
}

.icon-button {
  display: inline-flex;
  width: 42px;
  min-width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--glass-soft);
  color: var(--paper-soft);
  font-size: var(--size-sm);
  transition:
    border-color var(--speed-fast) var(--ease-out),
    background var(--speed-fast) var(--ease-out),
    transform var(--speed-fast) var(--ease-out);
}

.icon-button:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.icon-button:active {
  transform: scale(0.94);
}

.icon {
  position: relative;
  display: block;
  width: 18px;
  height: 18px;
}

.icon--sound::before {
  position: absolute;
  top: 5px;
  left: 1px;
  width: 7px;
  height: 8px;
  background: var(--paper-soft);
  clip-path: polygon(0 30%, 55% 30%, 100% 0, 100% 100%, 55% 70%, 0 70%);
  content: "";
}

.icon--sound::after {
  position: absolute;
  top: 3px;
  right: 0;
  width: 9px;
  height: 12px;
  border: 1px solid var(--paper-soft);
  border-left: 0;
  border-radius: 0 60% 60% 0;
  content: "";
  opacity: 0.7;
  transition: transform var(--speed-fast) var(--ease-out), opacity var(--speed-fast) var(--ease-out);
}

.is-muted .icon--sound::after {
  top: 8px;
  right: 0;
  width: 18px;
  height: 1px;
  border: 0;
  border-radius: 0;
  background: var(--paper-soft);
  opacity: 0.8;
  transform: rotate(-45deg);
}

.game-metrics {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--glass);
  backdrop-filter: blur(18px);
}

.metric {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding-right: var(--space-4);
  border-right: 1px solid var(--line);
}

.metric:last-of-type {
  border-right: 0;
  padding-right: 0;
}

.metric span {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
  text-transform: uppercase;
  white-space: nowrap;
}

.metric strong {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
}

.metric em {
  color: var(--faint);
  font-size: var(--size-xs);
  font-style: normal;
}

.game-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 312px;
  align-items: start;
  gap: var(--space-6);
}

.board-frame {
  --frame-pad: clamp(10px, 1.6vw, 18px);
  position: relative;
  width: min(100%, var(--board-max));
  margin: 0 auto;
  padding: var(--frame-pad);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 90% at 50% 0, var(--accent-soft), transparent 70%),
    linear-gradient(160deg, var(--glass-soft), var(--glass));
  box-shadow: var(--shadow-panel), 0 0 0 1px var(--ink-950) inset;
  isolation: isolate;
  transition: box-shadow var(--speed-slow) var(--ease-out), border-color var(--speed-slow) var(--ease-out);
}

.board-frame::before {
  position: absolute;
  z-index: -1;
  inset: 8%;
  border-radius: var(--radius-round);
  background: var(--beam-cyan);
  filter: blur(70px);
  opacity: 0.08;
  content: "";
}

.board-frame.is-complete {
  border-color: var(--success);
  box-shadow: var(--shadow-panel), 0 0 54px var(--beam-cyan-soft), 0 0 0 1px var(--success) inset;
}

.board {
  position: relative;
  display: grid;
  width: 100%;
  aspect-ratio: var(--ratio, 1);
  grid-template-columns: repeat(var(--cols, 7), minmax(0, 1fr));
  grid-template-rows: repeat(var(--rows, 7), minmax(0, 1fr));
  overflow: hidden;
  border-radius: calc(var(--radius-lg) - 8px);
  background: var(--ink-850);
  box-shadow:
    inset 0 0 0 1px var(--line),
    inset 0 0 70px var(--ink-950);
}

.beam-layer {
  position: absolute;
  inset: var(--frame-pad);
  width: auto;
  height: auto;
  overflow: visible;
  pointer-events: none;
}

.beam {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.beam--halo {
  filter: drop-shadow(0 0 6px var(--beam-cyan));
  opacity: 0.42;
  stroke-width: 0.34;
}

.beam--0.beam--halo {
  filter: drop-shadow(0 0 6px var(--beam-cyan));
  stroke: var(--beam-cyan);
}

.beam--1.beam--halo {
  filter: drop-shadow(0 0 6px var(--beam-magenta));
  stroke: var(--beam-magenta);
}

.beam--2.beam--halo {
  filter: drop-shadow(0 0 6px var(--beam-lime));
  stroke: var(--beam-lime);
}

.beam--1.beam--halo {
  stroke-dasharray: 0.36 0.16;
}

.beam--2.beam--halo {
  stroke-dasharray: 0.08 0.2;
}

.beam--core {
  animation: beam-flow 1.35s linear infinite;
  stroke: var(--beam-white);
  stroke-dasharray: 0.12 0.52;
  stroke-width: 0.062;
}

.cell {
  position: relative;
  display: grid;
  min-width: 0;
  padding: 0;
  place-items: center;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

.cell::before {
  position: absolute;
  inset: 1px;
  border-radius: 5px;
  background: linear-gradient(155deg, var(--ink-800), var(--ink-850));
  box-shadow: inset 0 0 0 1px var(--line);
  content: "";
  opacity: 0.9;
  transition: background var(--speed-fast) var(--ease-out), box-shadow var(--speed-fast) var(--ease-out);
}

.cell--floor::after {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: var(--radius-round);
  background: var(--line-strong);
  content: "";
  opacity: 0.45;
}

.cell--wall::before {
  background:
    repeating-linear-gradient(45deg, var(--ink-650), var(--ink-650) 3px, var(--ink-700) 3px, var(--ink-700) 7px);
  box-shadow:
    inset 0 0 0 1px var(--line-strong),
    inset 0 -10px 18px var(--ink-950);
}

.cell--mirror {
  cursor: pointer;
}

.cell--mirror:hover::before {
  background: linear-gradient(155deg, var(--ink-650), var(--ink-750));
  box-shadow:
    inset 0 0 0 1px var(--line-strong),
    0 0 22px var(--beam-cyan-soft);
}

.cell--mirror:focus-visible {
  outline: none;
}

.cell--mirror:focus-visible::after {
  position: absolute;
  inset: 2px;
  border: 2px solid var(--beam-cyan);
  border-radius: 6px;
  box-shadow: 0 0 18px var(--beam-cyan-soft);
  content: "";
}

.cell.is-turning .piece {
  animation: piece-bump var(--speed-mid) var(--ease-spring);
}

.piece {
  position: relative;
  z-index: 1;
  display: grid;
  width: 72%;
  height: 72%;
  place-items: center;
  pointer-events: none;
}

.piece--mirror {
  border-radius: var(--radius-round);
  background: radial-gradient(circle at 34% 24%, var(--ink-600), var(--ink-800) 72%);
  box-shadow:
    inset 0 0 0 1px var(--line-strong),
    0 8px 20px var(--ink-950);
}

.piece--mirror::before {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 68%;
  height: 9%;
  min-height: 4px;
  border-radius: var(--radius-round);
  background: linear-gradient(90deg, transparent, var(--paper-soft), var(--paper), var(--paper-soft), transparent);
  box-shadow: 0 0 12px var(--beam-cyan-soft);
  content: "";
  transform: translate(-50%, -50%) rotate(45deg);
  transition: transform var(--speed-mid) var(--ease-spring);
}

.is-backslash .piece--mirror::before {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.piece--mirror::after {
  position: absolute;
  inset: 18%;
  border: 1px dashed var(--line);
  border-radius: var(--radius-round);
  content: "";
  opacity: 0.5;
}

.piece--prism {
  width: 62%;
  height: 62%;
  filter: drop-shadow(0 0 14px var(--beam-magenta-soft));
}

.piece--prism::before {
  position: absolute;
  inset: 0;
  background: linear-gradient(145deg, var(--beam-cyan), var(--accent), var(--beam-magenta));
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  content: "";
  opacity: 0.92;
}

.piece--prism::after {
  position: absolute;
  inset: 6% 13% 13%;
  background: linear-gradient(145deg, var(--ink-650), var(--ink-850));
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  content: "";
  opacity: 0.78;
}

.piece--emitter {
  width: 68%;
  height: 68%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-round);
  background: radial-gradient(circle at 36% 30%, var(--ink-600), var(--ink-850) 70%);
  box-shadow:
    0 0 24px var(--beam-cyan-soft),
    inset 0 0 0 1px var(--ink-950);
}

.piece--emitter::before {
  position: absolute;
  inset: 13%;
  border: 1px dashed var(--beam-cyan);
  border-radius: var(--radius-round);
  content: "";
  opacity: 0.42;
}

.piece--emitter i {
  width: 34%;
  height: 34%;
  background: var(--beam-cyan);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  filter: drop-shadow(0 0 8px var(--beam-cyan));
}

.dir-north i {
  transform: rotate(-90deg);
}

.dir-south i {
  transform: rotate(90deg);
}

.dir-west i {
  transform: rotate(180deg);
}

.piece--receiver {
  width: 64%;
  height: 64%;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-round);
  background: radial-gradient(circle, var(--ink-700), var(--ink-850));
  box-shadow: inset 0 0 0 5px var(--ink-900);
  transition:
    border-color var(--speed-mid) var(--ease-out),
    box-shadow var(--speed-mid) var(--ease-out);
}

.piece--receiver::before {
  position: absolute;
  inset: 22%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-round);
  content: "";
}

.piece--receiver i {
  width: 26%;
  height: 26%;
  border-radius: var(--radius-round);
  background: var(--faint);
  transition: background var(--speed-mid) var(--ease-out), box-shadow var(--speed-mid) var(--ease-out);
}

.cell--receiver.is-lit .piece--receiver {
  border-color: var(--beam-cyan);
  box-shadow:
    0 0 30px var(--beam-cyan-soft),
    inset 0 0 22px var(--beam-cyan-soft),
    inset 0 0 0 5px var(--ink-900);
}

.cell--receiver.is-lit .piece--receiver i {
  animation: receiver-pulse 2s ease-in-out infinite;
  background: var(--beam-white);
  box-shadow:
    0 0 16px var(--beam-cyan),
    0 0 42px var(--beam-cyan-soft);
}

.board-corner {
  position: absolute;
  width: 18px;
  height: 18px;
  border-color: var(--beam-cyan);
  border-style: solid;
  opacity: 0.72;
  pointer-events: none;
}

.board-corner--tl {
  top: 8px;
  left: 8px;
  border-width: 1px 0 0 1px;
}

.board-corner--tr {
  top: 8px;
  right: 8px;
  border-width: 1px 1px 0 0;
}

.board-corner--bl {
  bottom: 8px;
  left: 8px;
  border-width: 0 0 1px 1px;
}

.board-corner--br {
  right: 8px;
  bottom: 8px;
  border-width: 0 1px 1px 0;
}

.game-side {
  position: sticky;
  top: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-md);
  background:
    radial-gradient(120% 90% at 100% 0, var(--accent-soft), transparent 58%),
    var(--glass);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow-panel);
}

.game-side h3 {
  font-family: var(--font-display);
  font-size: var(--display-sm);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.02em;
  line-height: 1.12;
}

.game-side__copy {
  color: var(--muted);
  font-size: var(--size-sm);
  line-height: 1.6;
}

.legend {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.legend__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--paper-soft);
  font-size: var(--size-sm);
}

.legend__item em {
  display: block;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  font-style: normal;
  letter-spacing: 0.04em;
}

.legend__glyph {
  position: relative;
  display: grid;
  width: 38px;
  height: 38px;
  flex: none;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-xs);
  background: var(--ink-800);
}

.legend__glyph--mirror {
  border-radius: var(--radius-round);
}

.legend__glyph--mirror::before {
  width: 22px;
  height: 2px;
  border-radius: var(--radius-round);
  background: var(--paper-soft);
  content: "";
  transform: rotate(45deg);
}

.legend__glyph--mirror::after {
  position: absolute;
  inset: 8px;
  border: 1px dashed var(--line);
  border-radius: var(--radius-round);
  content: "";
}

.legend__glyph--prism::before {
  width: 20px;
  height: 20px;
  background: linear-gradient(145deg, var(--beam-cyan), var(--beam-magenta));
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  content: "";
}

.legend__glyph--receiver::before {
  width: 19px;
  height: 19px;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-round);
  content: "";
}

.game-side__rule {
  height: 1px;
  background: var(--line);
}

.game-side__hint {
  padding: var(--space-3);
  border-left: 2px solid var(--beam-cyan);
  background: var(--beam-cyan-soft);
  color: var(--muted);
  font-size: var(--size-xs);
  line-height: 1.55;
}

.game-side .button {
  width: 100%;
  margin-top: auto;
}

.game-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-4);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.04em;
}

.footer {
  display: flex;
  width: min(100%, var(--shell-width));
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  margin: var(--space-6) auto 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
  text-transform: uppercase;
}

.modal {
  position: relative;
  width: min(92vw, 560px);
  max-height: min(90vh, 760px);
  padding: 0;
  overflow: auto;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--glass-strong);
  box-shadow: var(--shadow-deep), var(--shadow-glow);
  color: var(--paper);
}

.modal::backdrop {
  background: var(--backdrop);
  backdrop-filter: blur(12px);
}

.modal__glow {
  position: absolute;
  inset: -40% -20% auto;
  height: 70%;
  background: radial-gradient(circle at 50% 40%, var(--accent-soft), transparent 66%);
  pointer-events: none;
}

.modal__content {
  position: relative;
  padding: var(--space-6);
}

.modal__close {
  position: absolute;
  z-index: 2;
  top: var(--space-4);
  right: var(--space-4);
}

.modal h2 {
  max-width: 16ch;
  margin-top: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--display-md);
  font-weight: var(--weight-bold);
  letter-spacing: -0.04em;
  line-height: 1;
}

#modal-body {
  margin-top: var(--space-4);
  color: var(--muted);
  font-size: var(--size-sm);
  line-height: 1.65;
}

.modal .stars {
  margin-top: var(--space-3);
  font-size: var(--size-lg);
}

.modal__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.modal__fine {
  margin-top: var(--space-4);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  line-height: 1.6;
}

.howto-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.howto-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--glass-soft);
}

.howto-item strong {
  display: block;
  color: var(--paper-soft);
  font-size: var(--size-sm);
  font-weight: var(--weight-semibold);
}

.howto-item p {
  margin-top: 2px;
  color: var(--muted);
  font-size: var(--size-xs);
  line-height: 1.55;
}

.result-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-top: var(--space-4);
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
}

.result-grid div {
  min-width: 72px;
}

.result-grid dt {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
  text-transform: uppercase;
}

.result-grid dd {
  margin-top: 2px;
  color: var(--paper);
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
}

@keyframes screen-in {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes orbit-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes beam-travel {
  to {
    stroke-dashoffset: -72;
  }
}

@keyframes beam-flow {
  to {
    stroke-dashoffset: -0.64;
  }
}

@keyframes receiver-pulse {
  0%, 100% { opacity: 0.86; transform: scale(0.86); }
  50% { opacity: 1; transform: scale(1.12); }
}

@keyframes core-breathe {
  0%, 100% {
    box-shadow: 0 0 60px var(--beam-cyan-soft), 0 0 120px var(--beam-magenta-soft), var(--shadow-panel);
    transform: translate(-50%, -50%) rotate(45deg) scale(1);
  }
  50% {
    box-shadow: 0 0 90px var(--beam-cyan-soft), 0 0 160px var(--beam-magenta-soft), var(--shadow-panel);
    transform: translate(-50%, -50%) rotate(45deg) scale(1.04);
  }
}

@keyframes piece-bump {
  0% { transform: scale(1); }
  45% { transform: scale(0.84); }
  100% { transform: scale(1); }
}

@media (max-width: 1100px) {
  .screen--title {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.8fr);
    gap: var(--space-6);
  }

  .chamber-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .game-layout {
    grid-template-columns: minmax(0, 1fr) 282px;
  }
}

@media (max-width: 900px) {
  .screen--title {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: var(--space-4);
  }

  .title-art {
    width: min(88vw, 520px);
    margin: 0 auto;
    justify-self: center;
  }

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

  .game-side {
    position: static;
  }

  .game-side .button {
    margin-top: 0;
  }
}

@media (max-width: 720px) {
  .app-shell {
    padding: var(--space-4);
  }

  .topbar {
    margin-bottom: var(--space-5);
  }

  .topbar__chapter {
    display: none;
  }

  .title-copy h1 {
    max-width: 9ch;
  }

  .lede {
    font-size: var(--size-body);
  }

  .title-stats {
    gap: var(--space-5);
  }

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

  .chamber-progress {
    grid-template-columns: 1fr auto;
  }

  .chamber-progress__label {
    grid-column: 1 / -1;
  }

  .chamber-card {
    min-height: 210px;
  }

  .section-heading {
    align-items: flex-start;
  }

  .game-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .game-metrics {
    width: 100%;
    flex-wrap: wrap;
    justify-content: space-between;
    border-radius: var(--radius-md);
  }

  .metric {
    border-right: 0;
    padding-right: 0;
  }

  .game-foot {
    align-items: flex-start;
    flex-direction: column;
  }

  .game-foot p:last-child {
    display: none;
  }

  .footer {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .game-side {
    display: flex;
  }

  .legend {
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .screen--title {
    gap: var(--space-4);
  }

  .title-art {
    width: min(94vw, 380px);
  }

  .title-actions .button {
    width: 100%;
  }

  .title-stats {
    justify-content: space-between;
    gap: var(--space-3);
  }

  .topbar .ghost-button {
    min-height: 38px;
    padding: 0 var(--space-3);
    font-size: var(--size-xs);
  }

  .topbar .icon-button {
    width: 38px;
    min-width: 38px;
    height: 38px;
  }

  .topbar__meta {
    gap: var(--space-2);
  }

  .topbar [data-ui="open-howto"] {
    width: 38px;
    min-height: 38px;
    padding: 0;
    border-radius: var(--radius-round);
  }

  .howto-label {
    display: none;
  }

  .howto-compact {
    display: inline;
    font-family: var(--font-display);
    font-size: var(--size-sm);
    font-weight: var(--weight-bold);
  }

  .game-head__id h2 {
    font-size: var(--display-lg);
  }

  .board-frame {
    --frame-pad: 8px;
  }

  .board-corner {
    display: none;
  }

  .modal__content {
    padding: var(--space-5);
  }

  .modal__actions .button {
    flex: 1 1 100%;
  }

  .game-metrics {
    gap: var(--space-2);
    flex-wrap: nowrap;
    align-items: center;
  }

  .metric {
    flex-wrap: wrap;
    gap: 0 var(--space-1);
    min-width: 0;
  }

  .metric em {
    display: none;
  }

  .game-metrics .icon-button {
    width: 36px;
    min-width: 36px;
    height: 36px;
  }

  .metric strong {
    font-size: var(--size-body);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 1ms !important;
  }
}

@media (pointer: coarse) {
  .button,
  .icon-button,
  .ghost-button {
    min-height: 44px;
  }

  .icon-button {
    min-width: 44px;
  }

  .ghost-button {
    min-width: 44px;
  }
}

@media (forced-colors: active) {
  .title-copy h1 em {
    background: none;
    color: CanvasText;
    -webkit-text-fill-color: CanvasText;
  }

  .beam--core {
    stroke: Highlight;
  }

  .cell--receiver.is-lit .piece--receiver {
    border-color: Highlight;
  }
}

.title-stats dd em {
  margin-left: 2px;
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  font-style: normal;
}

.profile-chip {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  gap: var(--space-2);
  padding: 4px 12px 4px 4px;
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--glass-soft);
  color: var(--paper-soft);
  transition:
    border-color var(--speed-fast) var(--ease-out),
    background var(--speed-fast) var(--ease-out);
}

.profile-chip:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
}

.profile-chip:focus-visible {
  outline: 2px solid var(--beam-cyan);
  outline-offset: 3px;
}

.profile-chip__name {
  max-width: 11ch;
  overflow: hidden;
  color: var(--paper-soft);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.08em;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.sigil {
  --sigil-size: 34px;
  position: relative;
  display: inline-grid;
  width: var(--sigil-size);
  height: var(--sigil-size);
  flex: none;
  overflow: hidden;
  place-items: center;
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: radial-gradient(circle at 34% 26%, var(--ink-650), var(--ink-900) 72%);
  box-shadow: inset 0 0 20px var(--ink-950);
}

.sigil::before,
.sigil::after {
  position: absolute;
  content: "";
}

.sigil[data-sigil="prism"]::before {
  width: 54%;
  height: 54%;
  background: linear-gradient(135deg, var(--beam-cyan), var(--accent), var(--beam-magenta));
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
}

.sigil[data-sigil="prism"]::after {
  width: 60%;
  height: 1px;
  background: var(--paper);
  box-shadow: 0 0 8px var(--beam-cyan);
}

.sigil[data-sigil="orbit"]::before {
  width: 58%;
  height: 58%;
  border: 1px solid var(--beam-cyan);
  border-radius: var(--radius-round);
  box-shadow: 0 0 12px var(--beam-cyan-soft);
}

.sigil[data-sigil="orbit"]::after {
  width: 18%;
  height: 18%;
  border-radius: var(--radius-round);
  background: var(--beam-magenta);
  box-shadow: 0 0 12px var(--beam-magenta);
  transform: translate(38%, -34%);
}

.sigil[data-sigil="pulse"]::before {
  width: 52%;
  height: 52%;
  border: 1px solid var(--beam-lime);
  border-radius: var(--radius-round);
  box-shadow: 0 0 0 5px var(--beam-lime-soft), 0 0 16px var(--beam-lime-soft);
}

.sigil[data-sigil="pulse"]::after {
  width: 25%;
  height: 25%;
  border-radius: var(--radius-round);
  background: var(--beam-lime);
  box-shadow: 0 0 12px var(--beam-lime);
}

.sigil[data-sigil="helix"]::before,
.sigil[data-sigil="helix"]::after {
  width: 16%;
  height: 66%;
  border-radius: var(--radius-round);
  background: linear-gradient(180deg, var(--beam-cyan), var(--beam-magenta));
}

.sigil[data-sigil="helix"]::before {
  transform: rotate(28deg) translateX(-4px);
}

.sigil[data-sigil="helix"]::after {
  transform: rotate(-28deg) translateX(4px);
  opacity: 0.7;
}

.sigil--mini {
  --sigil-size: 30px;
}

.sigil--profile {
  --sigil-size: 96px;
  border-color: var(--line-strong);
  box-shadow: inset 0 0 30px var(--ink-950), 0 0 30px var(--accent-soft);
}

.sigil--option {
  --sigil-size: 42px;
}

.chamber-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-7);
}

.episode-block {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.episode-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-5);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--line);
}

.episode-head__id {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 2px;
}

.episode-number {
  color: var(--beam-cyan);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

.episode-head h3 {
  font-family: var(--font-display);
  font-size: var(--display-sm);
  font-weight: var(--weight-bold);
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.episode-head p {
  max-width: 62ch;
  margin-top: 2px;
  color: var(--muted);
  font-size: var(--size-sm);
  line-height: 1.5;
}

.episode-head__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex: none;
}

.episode-mechanic {
  padding: 5px 10px;
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--accent-soft);
  color: var(--paper-soft);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.episode-count {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.episode-lock {
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.episode-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
}

.episode-block.is-locked .episode-grid {
  opacity: 0.55;
}

.episode-block.is-locked .episode-head h3 {
  color: var(--muted);
}

.mechanic-note {
  padding: var(--space-3);
  border: 1px solid var(--line-ui);
  border-left: 2px solid var(--beam-magenta);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: linear-gradient(90deg, var(--beam-magenta-soft), transparent);
  color: var(--paper-soft);
  font-size: var(--size-xs);
  line-height: 1.55;
}

.mechanic-note strong {
  display: block;
  margin-bottom: 2px;
  color: var(--beam-magenta);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.legend__glyph--splitter::before {
  width: 18px;
  height: 18px;
  border: 1px solid var(--beam-cyan);
  border-radius: var(--radius-round);
  box-shadow: 0 0 10px var(--beam-cyan-soft);
  content: "";
}

.legend__glyph--splitter::after {
  position: absolute;
  left: 22px;
  width: 8px;
  height: 8px;
  background: var(--beam-magenta);
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  content: "";
  filter: drop-shadow(0 0 4px var(--beam-magenta));
}

.legend__glyph--portal::before {
  width: 20px;
  height: 20px;
  border: 2px solid var(--beam-lime);
  border-radius: var(--radius-round);
  box-shadow: 0 0 12px var(--beam-lime-soft), inset 0 0 8px var(--beam-lime-soft);
  content: "";
}

.legend__glyph--portal::after {
  width: 5px;
  height: 5px;
  border-radius: var(--radius-round);
  background: var(--beam-lime);
  content: "";
}

.cell--splitter {
  cursor: pointer;
}

.cell--splitter:hover::before {
  background: linear-gradient(155deg, var(--ink-650), var(--ink-750));
  box-shadow:
    inset 0 0 0 1px var(--line-strong),
    0 0 22px var(--beam-magenta-soft);
}

.cell--splitter:focus-visible {
  outline: none;
}

.cell--splitter:focus-visible::after {
  position: absolute;
  inset: 2px;
  border: 2px solid var(--beam-cyan);
  border-radius: 6px;
  box-shadow: 0 0 18px var(--beam-cyan-soft);
  content: "";
}

.piece--splitter {
  width: 68%;
  height: 68%;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-round);
  background: radial-gradient(circle at 34% 24%, var(--ink-600), var(--ink-850) 72%);
  box-shadow:
    inset 0 0 0 1px var(--line),
    0 8px 20px var(--ink-950);
}

.piece--splitter::before {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 58%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--beam-cyan), transparent);
  box-shadow: 0 0 10px var(--beam-cyan-soft);
  content: "";
  transform: translate(-50%, -50%);
}

.piece--splitter::after {
  position: absolute;
  top: 50%;
  left: 58%;
  width: 30%;
  height: 34%;
  background: linear-gradient(90deg, var(--beam-magenta), var(--accent));
  clip-path: polygon(0 0, 100% 50%, 0 100%);
  content: "";
  filter: drop-shadow(0 0 6px var(--beam-magenta));
  transform: translateY(-50%);
  transition: left var(--speed-mid) var(--ease-spring), transform var(--speed-mid) var(--ease-spring);
}

.is-split-left .piece--splitter::after {
  left: 12%;
  transform: translateY(-50%) scaleX(-1);
}

.piece--portal {
  width: 66%;
  height: 66%;
  border: 2px solid var(--beam-lime);
  border-radius: var(--radius-round);
  background: radial-gradient(circle, var(--ink-800), var(--ink-950));
  box-shadow:
    0 0 22px var(--beam-lime-soft),
    inset 0 0 22px var(--beam-lime-soft);
}

.piece--portal::before {
  position: absolute;
  inset: 22%;
  border: 1px solid var(--beam-lime);
  border-radius: var(--radius-round);
  content: "";
  opacity: 0.55;
}

.piece--portal[data-pair="3"] {
  border-color: var(--beam-magenta);
  box-shadow:
    0 0 22px var(--beam-magenta-soft),
    inset 0 0 22px var(--beam-magenta-soft);
}

.piece--portal[data-pair="3"]::before {
  border-color: var(--beam-magenta);
}

.portal-glyph {
  position: relative;
  z-index: 1;
  color: var(--beam-lime);
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  font-weight: var(--weight-bold);
  line-height: 1;
  text-shadow: 0 0 10px var(--beam-lime);
}

.piece--portal[data-pair="3"] .portal-glyph {
  color: var(--beam-magenta);
  text-shadow: 0 0 10px var(--beam-magenta);
}

.screen--profile {
  padding-bottom: var(--space-7);
}

.profile-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  align-items: start;
  gap: var(--space-5);
}

.profile-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-6);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 100% at 100% 0, var(--accent-soft), transparent 58%),
    var(--glass);
  box-shadow: var(--shadow-panel);
  backdrop-filter: blur(18px);
}

.profile-identity {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.profile-identity__copy {
  min-width: 0;
}

.profile-identity h3 {
  margin-top: 3px;
  overflow: hidden;
  font-family: var(--font-display);
  font-size: var(--display-md);
  font-weight: var(--weight-bold);
  letter-spacing: -0.03em;
  line-height: 1;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.profile-rank {
  margin-top: var(--space-2);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: var(--tracking-mid);
  text-transform: uppercase;
}

.profile-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.profile-form label {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.profile-form__row {
  display: flex;
  gap: var(--space-2);
}

.profile-form input {
  min-width: 0;
  min-height: 50px;
  flex: 1;
  padding: 0 var(--space-4);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--ink-850);
  color: var(--paper);
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.profile-form input:focus-visible {
  outline: 2px solid var(--beam-cyan);
  outline-offset: 2px;
}

.profile-save-status {
  min-height: 1.3em;
  color: var(--success);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sigil-picker {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
  padding-top: var(--space-4);
  border-top: 1px solid var(--line);
}

.sigil-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--glass-soft);
  color: var(--faint);
  font-size: var(--size-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition:
    border-color var(--speed-fast) var(--ease-out),
    background var(--speed-fast) var(--ease-out),
    color var(--speed-fast) var(--ease-out);
}

.sigil-option:hover {
  border-color: var(--line-strong);
  color: var(--paper-soft);
}

.sigil-option[aria-checked="true"] {
  border-color: var(--beam-cyan);
  background: var(--accent-soft);
  color: var(--paper);
  box-shadow: 0 0 18px var(--beam-cyan-soft);
}

.sigil-option:focus-visible {
  outline: 2px solid var(--beam-cyan);
  outline-offset: 2px;
}

.profile-side {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.profile-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.profile-stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(18px);
}

.profile-stat span {
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.profile-stat strong {
  font-family: var(--font-display);
  font-size: var(--size-lg);
  font-weight: var(--weight-semibold);
  font-variant-numeric: tabular-nums;
}

.profile-audio {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-md);
  background: var(--glass);
  backdrop-filter: blur(18px);
}

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  color: var(--paper-soft);
  cursor: pointer;
  font-size: var(--size-sm);
}

.toggle-row input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.toggle {
  position: relative;
  width: 44px;
  height: 24px;
  flex: none;
  border: 1px solid var(--line-ui);
  border-radius: var(--radius-round);
  background: var(--ink-700);
  transition: background var(--speed-fast) var(--ease-out), border-color var(--speed-fast) var(--ease-out);
}

.toggle::after {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: var(--radius-round);
  background: var(--faint);
  content: "";
  transition: transform var(--speed-fast) var(--ease-out), background var(--speed-fast) var(--ease-out);
}

.toggle-row input:checked + .toggle {
  border-color: var(--beam-cyan);
  background: var(--accent-soft);
}

.toggle-row input:checked + .toggle::after {
  background: var(--beam-cyan);
  box-shadow: 0 0 12px var(--beam-cyan);
  transform: translateX(18px);
}

.toggle-row input:focus-visible + .toggle {
  outline: 2px solid var(--beam-cyan);
  outline-offset: 3px;
}

.profile-episodes {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.episode-progress-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--glass);
}

.episode-progress-card.is-locked {
  opacity: 0.55;
}

.episode-progress-card__head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.episode-progress-card h4 {
  margin-top: 2px;
  font-family: var(--font-display);
  font-size: var(--size-body);
  font-weight: var(--weight-semibold);
  letter-spacing: -0.01em;
}

.episode-progress-card p {
  margin-top: 2px;
  color: var(--faint);
  font-size: var(--size-xs);
}

.episode-progress-card strong {
  color: var(--paper-soft);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.episode-progress-card__bar {
  height: 4px;
  overflow: hidden;
  border-radius: var(--radius-round);
  background: var(--ink-700);
}

.episode-progress-card__bar span {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--beam-cyan), var(--accent), var(--beam-magenta));
  transition: width var(--speed-slow) var(--ease-out);
}

.episode-progress-card__meta {
  display: flex;
  justify-content: space-between;
  gap: var(--space-2);
  color: var(--faint);
  font-family: var(--font-mono);
  font-size: var(--size-2xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 1100px) {
  .episode-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .profile-layout {
    grid-template-columns: minmax(0, 1fr) minmax(240px, 0.7fr);
  }
}

@media (max-width: 900px) {
  .episode-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .profile-episodes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .episode-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .episode-head__meta {
    justify-content: flex-start;
  }

  .episode-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .profile-chip {
    width: 38px;
    min-height: 38px;
    justify-content: center;
    padding: 0;
  }

  .profile-chip__name {
    display: none;
  }

  .profile-card {
    padding: var(--space-5);
  }

  .profile-episodes {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .episode-grid {
    grid-template-columns: 1fr;
  }

  .profile-identity {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-4);
  }

  .profile-identity h3 {
    white-space: normal;
  }

  .sigil--profile {
    --sigil-size: 76px;
  }

  .sigil-picker {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .profile-form__row {
    align-items: stretch;
    flex-direction: column;
  }

  .profile-form__row .button {
    width: 100%;
  }

  .profile-stat strong {
    font-size: var(--size-body);
  }
}

@media (max-width: 380px) {
  .brand__word span {
    display: none;
  }

  .topbar__meta {
    gap: 6px;
  }
}

/*
 * Keep topbar controls at the 44px touch target even when the narrow-screen
 * rules shrink them; this block must stay last so it wins the cascade.
 */
@media (pointer: coarse) {
  .topbar .icon-button,
  .topbar .ghost-button,
  .profile-chip {
    min-width: 44px;
    min-height: 44px;
  }
}