:root,
.photo-dialog {
  color-scheme: dark;
  --bg: #080a0d;
  --bg-raised: #0e1116;
  --surface: #13171d;
  --surface-2: #191e26;
  --surface-3: #202731;
  --text: #f3f5f7;
  --muted: #9ca6b5;
  --faint: #6f7887;
  --line: #2a313c;
  --line-strong: #3a4452;
  --accent: #ff7a1a;
  --accent-hover: #ff8b38;
  --accent-soft: rgba(255, 122, 26, .14);
  --success: #39d98a;
  --danger: #ff6171;
  --warning: #facc15;
  --cube-white: #f4f7fb;
  --cube-yellow: #ffd500;
  --cube-red: #ed1c24;
  --cube-orange: #ff6a00;
  --cube-green: #00b94f;
  --cube-blue: #006fe6;
  --cube-empty: #343b46;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 18px 50px rgba(0, 0, 0, .26);
  --accent-text: var(--accent);
  --header-bg: rgba(8, 10, 13, .92);
  --overlay-bg: rgba(19, 23, 29, .97);
  --surface-bg: rgba(19, 23, 29, .96);
  --stage-bg: #0b0e12;
  --hud-bg: rgba(5, 7, 10, .9);
  --chip-bg: rgba(5, 6, 8, .72);
  --float-shadow: 0 12px 34px rgba(0, 0, 0, .58);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
}

/* O app é claro. O bloco acima guarda as cores escuras da tela da câmera,
   que continua escura para não atrapalhar a imagem ao vivo. */
:root {
  color-scheme: light;
  --bg: #eef1f5;
  --bg-raised: #ffffff;
  --surface: #ffffff;
  --surface-2: #f2f4f7;
  --surface-3: #e3e7ed;
  --text: #121821;
  --muted: #4d5767;
  --faint: #677284;
  --line: #dce1e8;
  --line-strong: #c3cad5;
  --accent-text: #c2410c;
  --accent-soft: rgba(255, 122, 26, .12);
  --success: #15803d;
  --danger: #c8233a;
  --warning: #a16207;
  --shadow: 0 10px 30px rgba(24, 34, 52, .08);
  --header-bg: rgba(255, 255, 255, .9);
  --overlay-bg: rgba(255, 255, 255, .97);
  --surface-bg: #ffffff;
  --stage-bg: #e6eaf0;
  --hud-bg: rgba(255, 255, 255, .95);
  --chip-bg: rgba(255, 255, 255, .88);
  --float-shadow: 0 10px 30px rgba(24, 34, 52, .16);
}

:root .button:hover:not(:disabled) { border-color: #97a2b1; }
:root .button-secondary { color: #9a3412; border-color: rgba(234, 88, 12, .35); }
:root .move-chip.is-done { color: #9a3412; }
:root .algorithm code { color: #9a3412; }
:root .step-note { color: var(--muted); }
:root .stage-orientation span { color: var(--muted); border-color: var(--line); }
:root .cube-move-symbol { border-right-color: var(--line); }
:root .cube-move-arrow { stroke: var(--text); }
:root .current-move > div { background: var(--bg-raised); }
:root .algorithm { background: var(--surface-2); }
:root .toast { background: var(--bg-raised); }
:root dialog::backdrop { background: rgba(18, 24, 33, .45); }
:root dialog { box-shadow: 0 28px 80px rgba(24, 34, 52, .25); }
/* Contorno para o branco não sumir no fundo claro. */
:root .color-swatch:not([data-color="X"]) { box-shadow: inset 0 0 0 1px rgba(18, 24, 33, .18); }
:root .color-swatch.is-selected { box-shadow: inset 0 0 0 1px rgba(18, 24, 33, .18), 0 0 0 3px rgba(18, 24, 33, .12); }
:root .color-count::before { box-shadow: 0 0 0 1px rgba(18, 24, 33, .28); }
/* A câmera segue escura: desfaz os ajustes claros dentro dela. */
:root .photo-dialog .button-secondary { color: #ffd8bc; border-color: rgba(255, 122, 26, .3); }
:root .photo-dialog .button:hover:not(:disabled) { border-color: #515d6d; }

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
  /* Sem zoom por toque duplo (tocar rápido em "›" ampliava a página).
     O zoom de pinça continua funcionando. */
  touch-action: manipulation;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  background: var(--bg);
}

[hidden] {
  display: none !important;
}

button,
select {
  font: inherit;
}

button,
a,
select {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

button:focus-visible,
a:focus-visible,
select:focus-visible {
  outline: 3px solid rgba(255, 122, 26, .52);
  outline-offset: 3px;
}

button:disabled {
  cursor: not-allowed;
  opacity: .45;
}

a {
  color: inherit;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(1.75rem, 3.5vw, 3.1rem);
  line-height: 1.04;
  letter-spacing: -.045em;
}

h2 {
  margin-bottom: .35rem;
  font-size: 1.08rem;
  line-height: 1.25;
  letter-spacing: -.015em;
}

p {
  color: var(--muted);
  line-height: 1.55;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  transform: translateY(-150%);
  padding: 10px 14px;
  color: #111;
  background: var(--accent);
  border-radius: 8px;
}

.skip-link:focus {
  transform: translateY(0);
}

.app-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 76px;
  padding: 12px clamp(16px, 3vw, 44px);
  padding-top: max(12px, env(safe-area-inset-top));
  border-bottom: 1px solid var(--line);
}

/* O desfoque fica num pseudo-elemento: backdrop-filter no próprio cabeçalho
   transformaria-o no bloco de contenção das abas fixas no celular. */
.app-header::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  content: "";
  background: var(--header-bg);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  gap: 10px;
  text-decoration: none;
}

.brand > span:last-child {
  display: grid;
  gap: 1px;
}

.brand strong {
  font-size: .98rem;
  letter-spacing: -.01em;
}

.brand small {
  color: var(--muted);
  font-size: .72rem;
}

.brand-mark {
  display: grid;
  grid-template-columns: repeat(3, 8px);
  gap: 2px;
  padding: 5px;
  background: #050608;
  border: 1px solid var(--line-strong);
  border-radius: 9px;
  box-shadow: 0 5px 18px rgba(0, 0, 0, .35);
}

.brand-mark i {
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cube-white);
}

.brand-mark i:nth-child(2),
.brand-mark i:nth-child(8) { background: var(--cube-red); }
.brand-mark i:nth-child(3),
.brand-mark i:nth-child(6) { background: var(--cube-green); }
.brand-mark i:nth-child(4) { background: var(--cube-blue); }
.brand-mark i:nth-child(5) { background: var(--cube-yellow); }
.brand-mark i:nth-child(7),
.brand-mark i:nth-child(9) { background: var(--cube-orange); }

.tabs {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.tab-button {
  min-height: 40px;
  padding: 0 20px;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  font-size: .9rem;
  font-weight: 700;
}

.tab-button:hover {
  color: var(--text);
}

.tab-button.is-active {
  color: #0a0c10;
  background: var(--accent);
}

.header-actions {
  display: flex;
  gap: 8px;
  justify-self: end;
}

main {
  width: min(1760px, 100%);
  margin: 0 auto;
  padding: clamp(20px, 3vw, 42px);
}

.page-intro,
.tutorial-hero {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.eyebrow,
.overline {
  margin-bottom: 8px;
  color: var(--accent-text);
  font-size: .72rem;
  font-weight: 800;
  letter-spacing: .12em;
  line-height: 1.3;
  text-transform: uppercase;
}

.solver-readiness {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 12px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: .82rem;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--success);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(57, 217, 138, .12);
}

.status-dot.is-loading {
  background: var(--warning);
  box-shadow: 0 0 0 4px rgba(250, 204, 21, .12);
  animation: pulse 1.2s ease-in-out infinite;
}

.status-dot.is-error {
  background: var(--danger);
  box-shadow: 0 0 0 4px rgba(255, 97, 113, .12);
}

@keyframes pulse {
  50% { opacity: .35; }
}

.workspace {
  display: grid;
  grid-template-columns: minmax(330px, .9fr) minmax(390px, 1.22fr) minmax(310px, .84fr);
  gap: 16px;
  align-items: stretch;
}

.surface {
  background: var(--surface-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.editor-panel,
.viewer-panel,
.solution-panel {
  min-width: 0;
  padding: 20px;
}

.viewer-panel {
  display: flex;
  flex-direction: column;
}

.panel-heading {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
}

.panel-heading > div {
  min-width: 0;
}

.panel-heading p {
  margin-bottom: 0;
  font-size: .83rem;
}

.step-number {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 32px;
  height: 32px;
  color: #111;
  background: var(--accent);
  border-radius: 9px;
  font-size: .84rem;
  font-weight: 900;
}

.viewer-heading .icon-button {
  margin-left: auto;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  padding: 0;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
  transition: color .18s ease, background .18s ease, border-color .18s ease, transform .18s ease;
}

.icon-button:hover:not(:disabled) {
  color: var(--text);
  background: var(--surface-3);
  border-color: var(--line-strong);
}

.icon-button:active:not(:disabled),
.button:active:not(:disabled) {
  transform: translateY(1px);
}

.icon-button svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.palette {
  display: grid;
  grid-template-columns: repeat(7, minmax(34px, 1fr));
  gap: 7px;
  margin-bottom: 12px;
}

.color-swatch {
  position: relative;
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  min-height: 38px;
  padding: 0;
  background: var(--swatch);
  border: 2px solid transparent;
  border-radius: 9px;
  cursor: pointer;
}

.color-swatch[data-color="X"] {
  color: var(--muted);
  background: var(--surface-2);
  border-color: var(--line);
}

.color-swatch[data-color="X"]::before,
.color-swatch[data-color="X"]::after {
  position: absolute;
  width: 16px;
  height: 2px;
  background: currentColor;
  content: "";
}

.color-swatch[data-color="X"]::before { transform: rotate(45deg); }
.color-swatch[data-color="X"]::after { transform: rotate(-45deg); }

.color-swatch.is-selected {
  border-color: var(--text);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, .14);
}

.color-counts {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  min-height: 25px;
  margin-bottom: 14px;
}

.color-count {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 7px;
  color: var(--muted);
  background: var(--surface-2);
  border-radius: 999px;
  font-size: .7rem;
  font-variant-numeric: tabular-nums;
}

.color-count::before {
  width: 7px;
  height: 7px;
  background: var(--swatch);
  border-radius: 50%;
  content: "";
}

.color-count.is-complete {
  color: var(--text);
}

.color-count.is-over {
  color: var(--danger);
}

.face-net {
  display: grid;
  grid-template-columns: repeat(4, minmax(58px, 1fr));
  grid-template-rows: repeat(3, auto);
  gap: 7px;
  width: 100%;
  max-width: 440px;
  margin: 0 auto 14px;
}

.face-card {
  min-width: 0;
}

.face-card[data-face="U"] { grid-column: 2; grid-row: 1; }
.face-card[data-face="L"] { grid-column: 1; grid-row: 2; }
.face-card[data-face="F"] { grid-column: 2; grid-row: 2; }
.face-card[data-face="R"] { grid-column: 3; grid-row: 2; }
.face-card[data-face="B"] { grid-column: 4; grid-row: 2; }
.face-card[data-face="D"] { grid-column: 2; grid-row: 3; }

.face-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 4px;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: .63rem;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.face-label b {
  color: var(--text);
}

.face-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  padding: 4px;
  background: #050608;
  border: 1px solid #353c46;
  border-radius: 8px;
  box-shadow: 0 6px 14px rgba(0, 0, 0, .2);
}

.sticker-button {
  position: relative;
  aspect-ratio: 1;
  min-width: 0;
  padding: 0;
  background: var(--sticker, var(--cube-empty));
  border: 0;
  border-radius: 4px;
  cursor: crosshair;
  transition: filter .12s ease, transform .12s ease;
}

.sticker-button:hover:not(:disabled) {
  filter: brightness(1.15);
  transform: scale(.92);
}

.sticker-button:disabled {
  cursor: default;
  opacity: 1;
}

.sticker-button.is-center::after {
  position: absolute;
  inset: 30%;
  border: 1px solid rgba(0, 0, 0, .32);
  border-radius: 50%;
  content: "";
}

/* Diagnóstico: vermelho = peça impossível; laranja = quadrado da correção sugerida. */
.sticker-button.is-suspect {
  outline: 3px solid var(--danger);
  outline-offset: 1px;
  z-index: 1;
}

.sticker-button.is-fix {
  outline: 3px solid var(--accent);
  outline-offset: 1px;
  z-index: 2;
  animation: fix-pulse 1.2s ease-in-out infinite;
}

@keyframes fix-pulse {
  50% { outline-offset: 3px; }
}

.fix-card {
  display: grid;
  gap: 8px;
  margin-bottom: 14px;
  padding: 14px;
  background: rgba(255, 122, 26, .07);
  border: 1px solid rgba(234, 88, 12, .4);
  border-radius: 12px;
}

.fix-card strong {
  font-size: .9rem;
}

.fix-card p {
  margin: 0;
  font-size: .8rem;
  line-height: 1.45;
}

.fix-changes {
  display: grid;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: .8rem;
}

.fix-changes:empty {
  display: none;
}

.fix-changes li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

.fix-changes b {
  color: var(--text);
}

.fix-dot {
  width: 14px;
  height: 14px;
  background: var(--from);
  border-radius: 4px;
  box-shadow: inset 0 0 0 1px rgba(18, 24, 33, .25);
}

.fix-more {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.fix-retake {
  display: contents;
}

.fix-more .button {
  flex: 1 1 40%;
  min-height: 36px;
  padding: 0 10px;
  font-size: .76rem;
}

.fix-more:has(> .button[hidden]):has(> .fix-retake:empty) {
  display: none;
}

#face-net {
  scroll-margin-top: calc(84px + env(safe-area-inset-top));
}

.editor-tip {
  margin-bottom: 14px;
  color: var(--faint);
  font-size: .75rem;
  line-height: 1.45;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.button {
  min-height: 42px;
  padding: 0 15px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  cursor: pointer;
  font-size: .83rem;
  font-weight: 800;
  transition: background .18s ease, border-color .18s ease, transform .18s ease;
}

.button:hover:not(:disabled) {
  background: var(--surface-3);
  border-color: #515d6d;
}

.button-primary {
  color: #120a04;
  background: var(--accent);
  border-color: var(--accent);
}

.button-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.button-secondary {
  color: #ffd8bc;
  background: var(--accent-soft);
  border-color: rgba(255, 122, 26, .3);
}

.button-ghost {
  color: var(--muted);
  background: transparent;
}

.button-block {
  width: 100%;
}

.editor-actions .button {
  flex: 1 1 auto;
}

.cube-stage,
.tutorial-stage {
  position: relative;
  flex: 1 1 auto;
  min-height: 510px;
  overflow: hidden;
  background: var(--stage-bg);
  border: 1px solid var(--line);
  border-radius: 14px;
  touch-action: none;
}

.cube-stage canvas,
.tutorial-stage canvas {
  display: block;
  width: 100%;
  height: 100%;
  touch-action: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

.stage-orientation {
  position: absolute;
  z-index: 2;
  top: 12px;
  left: 12px;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  pointer-events: none;
}

.stage-orientation span {
  padding: 5px 7px;
  color: #c4ccd7;
  background: var(--chip-bg);
  border: 1px solid rgba(255, 255, 255, .1);
  border-radius: 999px;
  font-size: .65rem;
  font-weight: 700;
  backdrop-filter: blur(8px);
}

/* Setas discretas nas bordas: mostram que tocar no cubo avança ou volta. */
.stage-tap-hints {
  display: none;
}

body.has-solution .stage-tap-hints {
  position: absolute;
  z-index: 2;
  inset: 0;
  display: block;
  pointer-events: none;
}

.stage-tap {
  position: absolute;
  top: 42%;
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--text);
  background: var(--chip-bg);
  border: 1px solid var(--line);
  border-radius: 50%;
  opacity: .6;
  transform: translateY(-50%);
}

.stage-tap.is-prev { left: 10px; }
.stage-tap.is-next { right: 10px; }

body.is-solution-complete .stage-tap.is-next {
  display: none;
}

.stage-tap svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.stage-tap.is-flash {
  animation: tap-flash .45s ease;
}

@keyframes tap-flash {
  30% {
    color: #0a0c10;
    background: var(--accent);
    border-color: var(--accent);
    opacity: 1;
    transform: translateY(-50%) scale(1.15);
  }
}

.cube-move-hud {
  position: absolute;
  z-index: 3;
  right: 12px;
  bottom: 12px;
  left: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: 410px;
  padding: 10px 12px;
  color: var(--text);
  background: var(--hud-bg);
  border: 1px solid rgba(255, 122, 26, .48);
  border-radius: 13px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, .34);
  backdrop-filter: blur(10px);
  pointer-events: none;
}

.cube-move-symbol {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 4px;
  min-width: 104px;
  padding-right: 10px;
  border-right: 1px solid rgba(255, 255, 255, .12);
}

.cube-move-symbol > strong {
  min-width: 43px;
  color: var(--accent-text);
  font-size: 1.72rem;
  line-height: 1;
  text-align: center;
}

.cube-move-arrow-wrap {
  display: flex;
  flex-direction: column;
  width: 42px;
  height: 46px;
  align-items: center;
  justify-content: center;
  gap: 1px;
}

.cube-move-arrow {
  width: 29px;
  height: 29px;
  flex: 0 0 29px;
  fill: none;
  stroke: #fff;
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform .2s ease;
}

.cube-move-arrow.is-prime {
  transform: scaleX(-1);
}

.cube-move-arrow.is-half {
  opacity: .82;
}

/* A cada giro da meia-volta, a seta dá um pulso para marcar a contagem. */
.cube-move-hud.is-step-1 .cube-move-arrow,
.cube-move-hud.is-step-2 .cube-move-arrow {
  animation: half-step .5s ease;
}

@keyframes half-step {
  40% {
    stroke: var(--accent);
    transform: rotate(90deg) scale(1.12);
  }
}

.cube-move-degrees {
  display: block;
  min-width: 29px;
  padding: 1px 4px;
  color: #090b0e;
  background: var(--accent);
  border-radius: 4px;
  font-size: .5rem;
  font-weight: 900;
  line-height: 1.2;
  text-align: center;
}

.cube-move-copy {
  display: grid;
  min-width: 0;
  gap: 1px;
}

.cube-move-copy > span {
  color: var(--faint);
  font-size: .58rem;
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.cube-move-copy > strong {
  overflow: hidden;
  font-size: .85rem;
  line-height: 1.28;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cube-move-copy > small {
  color: var(--muted);
  font-size: .64rem;
  line-height: 1.3;
}

.webgl-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 32px;
  color: var(--muted);
  text-align: center;
}

.move-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 12px;
  margin-top: 13px;
  color: var(--faint);
  font-size: .7rem;
}

.move-legend b {
  color: var(--text);
}

.validation-card {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 10px;
  margin-bottom: 14px;
  padding: 13px;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 12px;
}

.validation-card strong {
  display: block;
  margin-bottom: 3px;
  font-size: .88rem;
}

.validation-card p {
  margin: 0;
  font-size: .76rem;
  line-height: 1.45;
}

.validation-icon {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  color: var(--muted);
  background: var(--surface-3);
  border-radius: 9px;
  font-weight: 900;
}

.validation-card.is-valid {
  background: rgba(57, 217, 138, .07);
  border-color: rgba(57, 217, 138, .25);
}

.validation-card.is-valid .validation-icon {
  color: var(--success);
  background: rgba(57, 217, 138, .12);
}

.validation-card.is-error {
  background: rgba(255, 97, 113, .07);
  border-color: rgba(255, 97, 113, .25);
}

.validation-card.is-error .validation-icon {
  color: var(--danger);
  background: rgba(255, 97, 113, .12);
}

.playback {
  display: grid;
  gap: 16px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.current-move {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 76px;
  padding: 12px;
  background: var(--surface-2);
  border-radius: 12px;
}

.current-move > div {
  display: grid;
  flex: 0 0 76px;
  min-height: 56px;
  place-items: center;
  align-content: center;
  background: #090b0e;
  border: 1px solid var(--line);
  border-radius: 10px;
}

.current-move .overline {
  margin-bottom: 2px;
  color: var(--faint);
  font-size: .58rem;
  letter-spacing: .07em;
}

.current-move strong {
  color: var(--accent-text);
  font-size: 1.7rem;
  line-height: 1;
}

.current-move p {
  margin: 0;
  font-size: .83rem;
}

.progress-track {
  height: 5px;
  overflow: hidden;
  background: var(--surface-3);
  border-radius: 999px;
}

.progress-track span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
  transition: width .2s ease;
}

.playback-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
}

.playback-controls .play-button {
  width: 50px;
  height: 50px;
  color: #111;
  background: var(--accent);
  border-color: var(--accent);
  border-radius: 50%;
}

.pause-icon {
  display: none;
}

.play-button.is-playing .play-icon {
  display: none;
}

.play-button.is-playing .pause-icon {
  display: block;
}

.speed-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 700;
}

.speed-control select {
  min-height: 38px;
  padding: 0 34px 0 11px;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  /* 16px: abaixo disso o iPhone amplia a página ao tocar na caixa. */
  font-size: 16px;
}

.move-sequence-wrap .overline {
  display: block;
  color: var(--faint);
}

.move-sequence {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  max-height: 142px;
  overflow-y: auto;
  padding-right: 4px;
}

.move-chip {
  min-width: 36px;
  height: 34px;
  padding: 0 8px;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-size: .77rem;
  font-weight: 800;
}

.move-chip.is-done {
  color: #ffc9a2;
  background: rgba(255, 122, 26, .08);
  border-color: rgba(255, 122, 26, .25);
}

.move-chip.is-current {
  color: #111;
  background: var(--accent);
  border-color: var(--accent);
}

/* Tutorial */

#panel-tutorial {
  max-width: 1320px;
  margin: 0 auto;
}

.tutorial-hero {
  align-items: center;
  min-height: 360px;
}

.tutorial-hero > div:first-child {
  max-width: 640px;
}

.tutorial-hero > div:first-child > p:last-child {
  max-width: 560px;
  margin: 18px 0 0;
  font-size: 1.06rem;
}

.tutorial-demo {
  flex: 0 1 430px;
  padding: 12px;
}

.tutorial-stage {
  min-height: 300px;
}

.tutorial-demo-actions {
  margin-top: 10px;
}

.tutorial-demo-actions .button {
  flex: 1 1 auto;
}

.notation {
  display: grid;
  grid-template-columns: minmax(260px, 1fr) minmax(340px, 1fr);
  gap: 28px;
  align-items: center;
  margin-bottom: 18px;
  padding: 24px;
}

.notation h2 {
  font-size: 1.45rem;
}

.notation p:last-child {
  margin-bottom: 0;
}

.notation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.notation-grid span {
  display: flex;
  align-items: center;
  gap: 9px;
  min-height: 48px;
  padding: 9px;
  color: var(--muted);
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  font-size: .8rem;
}

.notation-grid b {
  display: grid;
  place-items: center;
  width: 27px;
  height: 27px;
  color: #111;
  background: var(--accent);
  border-radius: 7px;
}

.tutorial-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.tutorial-index {
  position: sticky;
  top: 94px;
  display: grid;
  gap: 4px;
  padding: 16px;
}

.tutorial-index .overline {
  margin: 2px 8px 9px;
  color: var(--faint);
}

.tutorial-index a {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 7px 9px;
  color: var(--muted);
  border-radius: 8px;
  font-size: .8rem;
  font-weight: 700;
  text-decoration: none;
}

.tutorial-index a:hover {
  color: var(--text);
  background: var(--surface-2);
}

.tutorial-index a span {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  color: var(--accent-text);
  background: var(--accent-soft);
  border-radius: 7px;
}

.tutorial-steps {
  display: grid;
  gap: 12px;
}

.tutorial-step {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  padding: clamp(20px, 3vw, 32px);
  scroll-margin-top: 96px;
}

.tutorial-step h2 {
  margin-bottom: 10px;
  font-size: clamp(1.25rem, 2vw, 1.7rem);
}

.tutorial-step .eyebrow {
  margin-bottom: 5px;
}

.tutorial-step p {
  max-width: 820px;
}

.step-note {
  margin: 13px 0 0;
  padding-left: 13px;
  color: #b6bfcb;
  border-left: 2px solid var(--accent);
  font-size: .86rem;
}

.algorithm-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
}

.algorithm {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  width: 100%;
  min-height: 58px;
  margin-top: 14px;
  padding: 12px 14px;
  color: var(--text);
  text-align: left;
  background: #0b0e12;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  cursor: pointer;
}

.algorithm:hover {
  border-color: var(--accent);
}

.algorithm code {
  flex: 1 1 auto;
  color: #ffd2b2;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: clamp(.82rem, 1.5vw, 1rem);
  font-weight: 800;
  white-space: normal;
}

.algorithm small {
  flex: 1 0 100%;
  color: var(--faint);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .07em;
  text-transform: uppercase;
}

.algorithm span {
  color: var(--accent-text);
  font-size: .72rem;
  font-weight: 800;
}

.goal-grid {
  display: grid;
  grid-template-columns: repeat(3, 36px);
  gap: 3px;
  width: max-content;
  margin-top: 15px;
  padding: 5px;
  background: #050608;
  border-radius: 9px;
}

.goal-grid i {
  width: 36px;
  height: 36px;
  background: var(--cube-empty);
  border-radius: 4px;
}

.goal-grid i.white {
  background: var(--cube-white);
}

.warning-box {
  margin-top: 15px;
  padding: 14px;
  background: rgba(250, 204, 21, .07);
  border: 1px solid rgba(250, 204, 21, .22);
  border-radius: 10px;
}

.warning-box strong {
  color: var(--warning);
}

.warning-box p {
  margin: 5px 0 0;
  font-size: .84rem;
}

footer {
  padding: 12px 24px 30px;
  text-align: center;
}

footer p {
  margin: 0;
  color: var(--faint);
  font-size: .72rem;
}

dialog {
  width: min(520px, calc(100% - 28px));
  padding: 0;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: 16px;
  box-shadow: 0 28px 80px rgba(0, 0, 0, .62);
}

dialog::backdrop {
  background: rgba(3, 4, 6, .78);
  backdrop-filter: blur(5px);
}

dialog form {
  padding: 22px;
}

.photo-dialog {
  width: min(720px, calc(100% - 24px));
  max-height: min(900px, calc(100dvh - 24px));
  overflow: auto;
  background: #090b0e;
}

.photo-dialog-body {
  padding: 22px;
}

.photo-review-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.photo-progress-row {
  display: block;
  margin-top: 20px;
  padding: 12px 14px;
  color: var(--text);
  background: #050607;
  border: 1px solid var(--line);
  border-radius: 12px 12px 0 0;
  font-size: .9rem;
  font-weight: 800;
}

.photo-progress-row > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.photo-stage-label {
  font-size: 1rem;
}

.photo-progress-track {
  height: 3px;
  overflow: hidden;
  background: var(--surface-3);
}

.photo-progress-track span {
  display: block;
  width: 16.66%;
  height: 100%;
  background: var(--accent);
  border-radius: inherit;
  transition: width .2s ease;
}

.photo-guidance {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 15px;
  margin: 0 0 12px;
  padding: 10px 14px;
  color: var(--muted);
  background: #050607;
  border: 1px solid var(--line);
  border-top: 0;
  border-radius: 0 0 12px 12px;
  font-size: .78rem;
}

.photo-guidance span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.photo-guidance b {
  color: var(--text);
  font-size: .8rem;
}

.photo-guide-dot,
.photo-guide-square {
  display: inline-block;
  width: 11px;
  height: 11px;
  background: var(--guide-color, var(--cube-blue));
  border: 1px solid rgba(255, 255, 255, .46);
}

.photo-guide-dot {
  border-radius: 50%;
}

.photo-guide-square {
  border-radius: 2px;
}

.photo-steady i {
  width: 11px;
  height: 11px;
  border: 2px solid var(--success);
  border-radius: 50%;
  box-shadow: inset 0 0 0 2px #050607;
}

.photo-camera-stage {
  position: relative;
  aspect-ratio: 1.18 / 1;
  overflow: hidden;
  background: #020304;
  border: 1px solid #1e242c;
  border-radius: 14px;
}

.photo-camera-stage video,
.photo-camera-stage canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.photo-camera-placeholder {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 8px;
  padding: 20px;
  color: var(--muted);
  text-align: center;
}

.photo-camera-placeholder svg {
  width: 54px;
  fill: #3c4653;
}

.photo-camera-placeholder p {
  margin: 0 0 5px;
}

.photo-face-guide {
  --guide-size: min(62%, 360px);
  position: absolute;
  z-index: 3;
  top: 50%;
  left: 50%;
  width: var(--guide-size);
  aspect-ratio: 1;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.photo-face-guide .corner {
  position: absolute;
  width: 24%;
  height: 24%;
  border-color: rgba(255, 255, 255, .94);
  border-style: solid;
  border-width: 0;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, .6));
}

.corner-tl { top: -5px; left: -5px; border-top-width: 7px !important; border-left-width: 7px !important; border-radius: 28px 0 0; }
.corner-tr { top: -5px; right: -5px; border-top-width: 7px !important; border-right-width: 7px !important; border-radius: 0 28px 0 0; }
.corner-br { right: -5px; bottom: -5px; border-right-width: 7px !important; border-bottom-width: 7px !important; border-radius: 0 0 28px; }
.corner-bl { bottom: -5px; left: -5px; border-bottom-width: 7px !important; border-left-width: 7px !important; border-radius: 0 0 0 28px; }

.photo-face-guide i {
  position: absolute;
  display: block;
  background: rgba(255, 255, 255, .36);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .7);
}

.photo-face-guide .guide-v { top: 2%; bottom: 2%; width: 1px; }
.photo-face-guide .guide-h { right: 2%; left: 2%; height: 1px; }
.guide-v1 { left: 33.333%; }
.guide-v2 { left: 66.666%; }
.guide-h1 { top: 33.333%; }
.guide-h2 { top: 66.666%; }

.photo-detected-grid {
  position: absolute;
  z-index: 4;
  top: 50%;
  left: 50%;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 4px;
  width: min(62%, 360px);
  aspect-ratio: 1;
  padding: 5px;
  pointer-events: none;
  transform: translate(-50%, -50%);
}

.photo-detected-cell {
  background: rgba(var(--sample-rgb), .68);
  border: 2px solid rgba(255, 255, 255, .7);
  border-radius: 8px;
  box-shadow: inset 0 0 18px rgba(0, 0, 0, .16);
}

.photo-face-rail {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 5px;
  margin-top: 12px;
  padding: 10px;
  background: #050607;
  border: 1px solid var(--line);
  border-radius: 13px;
}

.photo-face-step {
  display: grid;
  justify-items: center;
  gap: 5px;
  min-width: 0;
  padding: 7px 3px;
  color: var(--faint);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 9px;
  font-size: .66rem;
  cursor: default;
}

.photo-face-step.is-current {
  color: var(--text);
  background: var(--surface-2);
  border-color: var(--line-strong);
}

.photo-face-mini {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  width: 38px;
  aspect-ratio: 1;
  padding: 3px;
  background: #151a20;
  border: 1px solid #39424f;
  border-radius: 7px;
}

.photo-face-mini i {
  background: var(--mini-color, #252c35);
  border-radius: 1px;
}

.photo-scan-controls {
  display: grid;
  grid-template-columns: 1fr 1.2fr 1fr;
  align-items: center;
  margin-top: 12px;
}

.photo-side-action {
  display: grid;
  justify-items: center;
  gap: 4px;
  justify-self: center;
  min-width: 72px;
  padding: 5px;
  color: var(--muted);
  background: transparent;
  border: 0;
  font-size: .72rem;
  font-weight: 750;
  cursor: pointer;
}

.photo-side-action svg {
  width: 26px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.photo-shutter {
  display: grid;
  place-items: center;
  justify-self: center;
  width: 76px;
  height: 76px;
  padding: 6px;
  background: transparent;
  border: 3px solid #eef1f4;
  border-radius: 50%;
  cursor: pointer;
}

.photo-shutter span {
  width: 100%;
  height: 100%;
  background: #fff;
  border-radius: 50%;
  transition: transform .16s ease, background .16s ease;
}

.photo-shutter:active:not(:disabled) span {
  background: var(--accent);
  transform: scale(.88);
}

.photo-scan-caption {
  min-height: 22px;
  margin: 7px 0 0;
  color: var(--text);
  font-size: .82rem;
  font-weight: 700;
  text-align: center;
}

.photo-confirm-actions {
  margin-top: 10px;
}

.photo-confirm-actions .button,
.photo-review-actions .button {
  flex: 1 1 150px;
}

.photo-privacy {
  margin: 10px 0 0;
  padding-left: 20px;
  position: relative;
  color: var(--faint);
  font-size: .75rem;
  line-height: 1.45;
}

.photo-privacy::before {
  position: absolute;
  left: 2px;
  content: '\1F512';
  font-size: .72rem;
}

.photo-review-heading {
  margin: 20px 0 16px;
}

.photo-review-heading p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.5;
}

.photo-review-heading h3 {
  margin: 0;
  font-size: 1.1rem;
}

.photo-review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.photo-review-face {
  padding: 10px;
  background: #0d1117;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.photo-review-face header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: .78rem;
  font-weight: 800;
}

.photo-review-cells {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3px;
  padding: 4px;
  background: #252c36;
  border-radius: 8px;
}

.photo-review-cell {
  position: relative;
  aspect-ratio: 1;
  background: var(--sticker);
  border: 0;
  border-radius: 4px;
}

.photo-review-cell.is-uncertain::after {
  position: absolute;
  inset: 2px;
  content: '';
  border: 2px solid #111;
  border-radius: 3px;
  box-shadow: 0 0 0 2px var(--warning);
}

.photo-review-actions {
  margin-top: 16px;
}

.dialog-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.dialog-header h2 {
  font-size: 1.45rem;
}

.help-steps {
  display: grid;
  gap: 12px;
  margin: 20px 0;
  padding: 0;
  list-style: none;
}

.help-steps li {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  align-items: start;
}

.help-steps span {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  color: #111;
  background: var(--accent);
  border-radius: 8px;
  font-size: .8rem;
  font-weight: 900;
}

.help-steps p {
  margin: 3px 0 0;
  font-size: .87rem;
}

.toast-region {
  position: fixed;
  z-index: 80;
  right: max(14px, env(safe-area-inset-right));
  bottom: max(14px, env(safe-area-inset-bottom));
  display: grid;
  gap: 8px;
  width: min(360px, calc(100% - 28px));
  pointer-events: none;
}

.toast {
  padding: 13px 15px;
  color: var(--text);
  background: #1b2129;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  box-shadow: var(--shadow);
  animation: toast-in .2s ease both;
  font-size: .82rem;
}

.toast.is-error {
  border-color: rgba(255, 97, 113, .45);
}

@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
}

@media (max-width: 1220px) {
  .workspace {
    grid-template-columns: minmax(330px, .9fr) minmax(430px, 1.1fr);
  }

  .solution-panel {
    grid-column: 1 / -1;
  }

  .solution-panel .playback {
    grid-template-columns: minmax(240px, .8fr) minmax(320px, 1.2fr);
    align-items: center;
  }

  .solution-panel .current-move,
  .solution-panel .progress-track,
  .solution-panel .playback-controls,
  .solution-panel .speed-control {
    grid-column: 1;
  }

  .solution-panel .move-sequence-wrap {
    grid-column: 2;
    grid-row: 1 / span 4;
  }

  .solution-panel .move-sequence {
    max-height: none;
  }
}

@media (max-width: 820px) {
  .app-header {
    grid-template-columns: 1fr auto;
    min-height: 68px;
    padding: 10px max(14px, env(safe-area-inset-right)) 10px max(14px, env(safe-area-inset-left));
    padding-top: max(10px, env(safe-area-inset-top));
  }

  .brand small {
    display: none;
  }

  .tabs {
    position: fixed;
    z-index: 40;
    right: max(12px, env(safe-area-inset-right));
    bottom: max(12px, env(safe-area-inset-bottom));
    left: max(12px, env(safe-area-inset-left));
    justify-content: stretch;
    box-shadow: var(--float-shadow);
  }

  .tab-button {
    flex: 1;
    min-height: 48px;
  }

  .header-actions {
    grid-column: 2;
  }

  main {
    padding: 22px 14px 96px;
  }

  .page-intro,
  .tutorial-hero {
    align-items: flex-start;
    flex-direction: column;
  }

  .solver-readiness {
    align-self: flex-start;
  }

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

  .editor-panel,
  .viewer-panel,
  .solution-panel {
    padding: 16px;
  }

  .viewer-panel,
  .solution-panel {
    grid-column: auto;
  }

  .cube-stage {
    min-height: min(440px, 70vh);
  }

  .solution-panel .playback {
    display: grid;
    grid-template-columns: 1fr;
  }

  .solution-panel .current-move,
  .solution-panel .progress-track,
  .solution-panel .playback-controls,
  .solution-panel .speed-control,
  .solution-panel .move-sequence-wrap {
    grid-column: 1;
    grid-row: auto;
  }

  .tutorial-hero {
    min-height: 0;
  }

  .tutorial-demo {
    width: 100%;
    flex-basis: auto;
  }

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

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

  .tutorial-index {
    position: static;
    grid-template-columns: repeat(2, 1fr);
  }

  .tutorial-index .overline {
    grid-column: 1 / -1;
  }
}

@media (max-width: 520px) {
  h1 {
    font-size: 2rem;
  }

  .brand > span:last-child {
    display: none;
  }

  .face-net {
    grid-template-columns: repeat(4, minmax(48px, 1fr));
    gap: 5px;
  }

  .face-grid {
    gap: 2px;
    padding: 3px;
  }

  .face-label span {
    display: none;
  }

  .palette {
    gap: 5px;
  }

  .color-swatch {
    min-height: 35px;
  }

  .cube-stage {
    min-height: 370px;
  }

  .cube-move-hud {
    right: 8px;
    bottom: 8px;
    left: 8px;
    gap: 8px;
    padding: 9px 10px;
  }

  .cube-move-symbol {
    min-width: 88px;
    padding-right: 7px;
  }

  .cube-move-symbol > strong {
    min-width: 37px;
    font-size: 1.46rem;
  }

  .cube-move-arrow-wrap {
    width: 36px;
    height: 43px;
  }

  .cube-move-arrow {
    width: 26px;
    height: 26px;
    flex-basis: 26px;
  }

  .cube-move-copy > strong {
    font-size: .76rem;
  }

  .cube-move-copy > small {
    font-size: .57rem;
  }

  .photo-dialog {
    width: calc(100% - 12px);
    max-height: calc(100dvh - 12px);
  }

  .photo-dialog-body {
    padding: 16px;
  }

  .photo-dialog .dialog-header h2 {
    font-size: 1.18rem;
  }

  .photo-camera-stage {
    aspect-ratio: 1 / 1;
  }

  .photo-face-guide {
    --guide-size: 68%;
  }

  .photo-detected-grid {
    width: 68%;
  }

  .photo-face-rail {
    gap: 2px;
    padding: 7px 4px;
  }

  .photo-face-step {
    padding: 5px 1px;
    font-size: .58rem;
  }

  .photo-face-mini {
    width: 32px;
  }

  .photo-guidance {
    gap: 6px 11px;
  }

  .photo-steady {
    display: none !important;
  }

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

  .current-move {
    align-items: flex-start;
    flex-direction: column;
  }

  .current-move > div {
    width: 100%;
  }

  .tutorial-stage {
    min-height: 270px;
  }

  .notation {
    padding: 18px;
  }

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

  .tutorial-index {
    grid-template-columns: 1fr;
  }

  .tutorial-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
    padding: 18px 14px;
  }

  .tutorial-step .step-number {
    width: 30px;
    height: 30px;
  }

  .algorithm-pair {
    grid-template-columns: 1fr;
  }

  .algorithm span {
    flex-basis: 100%;
  }
}

@media (max-width: 820px) {
  body.is-cube-ready:not(.has-solution) #solve-button {
    position: fixed;
    z-index: 42;
    right: 14px;
    bottom: calc(76px + env(safe-area-inset-bottom));
    left: 14px;
    width: auto;
    min-height: 52px;
    box-shadow: var(--float-shadow);
  }

  body.has-solution main {
    padding-bottom: calc(170px + env(safe-area-inset-bottom));
  }

  /* Avisos acima da barra de abas e, com solução, acima dos controles. */
  .toast-region {
    bottom: calc(84px + env(safe-area-inset-bottom));
  }

  body.has-solution .toast-region {
    bottom: calc(148px + env(safe-area-inset-bottom));
  }

  /* Ao concluir, o cartão "Cubo resolvido" ocupa essa faixa: o aviso sobe. */
  body.is-solution-complete .toast-region {
    bottom: calc(232px + env(safe-area-inset-bottom));
  }

  /* No celular o cubo precisa caber inteiro entre o cabeçalho e os controles fixos. */
  body.has-solution #cube-stage {
    min-height: 0;
    height: clamp(280px, calc(100dvh - 300px), 440px);
    scroll-margin-top: calc(84px + env(safe-area-inset-top));
  }

  /* O painel sobre o cubo já mostra o movimento atual; o cartão fixo
     só aparece ao final, para confirmar que o cubo foi resolvido. */
  body.has-solution:not(.is-solution-complete) #panel-resolver .current-move {
    display: none;
  }

  body.has-solution #panel-resolver .current-move {
    position: fixed;
    z-index: 42;
    right: 12px;
    bottom: calc(140px + env(safe-area-inset-bottom));
    left: 12px;
    display: grid;
    grid-template-columns: 76px minmax(0, 1fr);
    align-items: center;
    min-height: 72px;
    padding: 8px;
    background: var(--overlay-bg);
    border: 1px solid var(--line-strong);
    border-radius: 13px;
    box-shadow: var(--float-shadow);
    backdrop-filter: blur(14px);
  }

  body.has-solution #panel-resolver .current-move > div {
    width: auto;
    min-height: 54px;
    flex-basis: auto;
  }

  body.has-solution #panel-resolver .current-move .overline {
    display: none;
  }

  body.has-solution #panel-resolver .current-move p {
    font-size: .78rem;
    line-height: 1.35;
  }

  body.has-solution #panel-resolver .playback-controls {
    position: fixed;
    z-index: 42;
    right: max(12px, env(safe-area-inset-right));
    bottom: calc(76px + env(safe-area-inset-bottom));
    left: max(12px, env(safe-area-inset-left));
    min-height: 56px;
    padding: 5px 8px;
    background: var(--overlay-bg);
    border: 1px solid var(--line-strong);
    border-radius: 13px;
    box-shadow: var(--float-shadow);
    backdrop-filter: blur(14px);
  }

  body.has-solution #panel-resolver .playback-controls .icon-button {
    width: 40px;
    height: 40px;
  }

  body.has-solution #panel-resolver .playback-controls .play-button {
    width: 48px;
    height: 48px;
  }
}

/* Celulares baixos (iPhone SE e afins): painel do movimento em uma faixa só. */
@media (max-width: 820px) and (max-height: 720px) {
  .cube-move-hud {
    right: 6px;
    bottom: 6px;
    left: 6px;
    padding: 6px 10px;
  }

  .cube-move-copy > small {
    display: none;
  }

  /* O sentido do giro nunca pode ser cortado com reticências. */
  .cube-move-copy > strong {
    white-space: normal;
  }

  .cube-move-arrow-wrap {
    height: 34px;
  }

  .stage-orientation {
    top: 8px;
    left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}