/* ————————————————————————————————————————————————
   HUERDLE · stylesheet
   charcoal, hairlines, serif display, mono instrumentation
   ———————————————————————————————————————————————— */

:root {
  --bg: #0e0e11;
  --panel-bg: #131318;
  --ink: #e9e4da;
  --ink-dim: rgba(233, 228, 218, 0.58);
  --ink-faint: rgba(233, 228, 218, 0.32);
  --line: rgba(233, 228, 218, 0.14);
  --line-strong: rgba(233, 228, 218, 0.34);
  --c1: #14525f;
  --c2: #e0a458;
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --ease-out: cubic-bezier(0.22, 0.9, 0.26, 1);
  --ease-snap: cubic-bezier(0.34, 1.45, 0.4, 1);
  --strip-h: clamp(120px, 23vh, 208px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.5;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
}

button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
button:focus-visible { outline: 1px dashed var(--ink-dim); outline-offset: 3px; }

.hidden { display: none !important; }

/* ———————————————————— atmosphere ———————————————————— */

.bg-glow {
  position: fixed;
  width: 58vmin; height: 58vmin;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.13;
  pointer-events: none;
  z-index: 0;
  transition: opacity 1.2s ease;
}
.glow-a { top: -12vmin; left: -8vmin;  animation: drift-a 31s ease-in-out infinite alternate; }
.glow-b { bottom: -14vmin; right: -9vmin; animation: drift-b 37s ease-in-out infinite alternate; }

@keyframes drift-a {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(9vmin, 7vmin) scale(1.18); }
}
@keyframes drift-b {
  from { transform: translate(0, 0) scale(1.12); }
  to   { transform: translate(-8vmin, -6vmin) scale(0.96); }
}

.bg-vignette {
  position: fixed; inset: 0;
  background: radial-gradient(120% 90% at 50% 42%, transparent 55%, rgba(0, 0, 0, 0.5) 100%);
  pointer-events: none;
  z-index: 1;
}

.bg-grain {
  position: fixed; inset: -120px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)' opacity='0.55'/%3E%3C/svg%3E");
  opacity: 0.05;
  mix-blend-mode: overlay;
  pointer-events: none;
  z-index: 2;
  animation: grain 1.4s steps(7) infinite;
}
@keyframes grain {
  0%   { transform: translate(0, 0); }
  14%  { transform: translate(-34px, 22px); }
  28%  { transform: translate(18px, -40px); }
  42%  { transform: translate(-46px, -14px); }
  57%  { transform: translate(30px, 34px); }
  71%  { transform: translate(-12px, 46px); }
  85%  { transform: translate(42px, -20px); }
  100% { transform: translate(0, 0); }
}

/* ———————————————————— top chrome ———————————————————— */

.top {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  z-index: 60;
  pointer-events: none;
}
.top > * { pointer-events: auto; }
.top-left, .top-right { flex: 1 0 0; display: flex; gap: 6px; }
.top-right { justify-content: flex-end; }

.top-center {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink-dim);
  white-space: nowrap;
}
.hud-sep { width: 1px; height: 12px; background: var(--line-strong); }

.ghost-btn {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  padding: 8px 10px;
  transition: color 0.25s ease;
}
.ghost-btn:hover { color: var(--ink); }

.icon-btn {
  position: relative;
  width: 36px; height: 36px;
  display: grid; place-items: center;
  color: var(--ink-dim);
  border: 1px solid transparent;
  border-radius: 50%;
  transition: color 0.25s ease, border-color 0.25s ease;
}
.icon-btn:hover { color: var(--ink); border-color: var(--line); }
.icon-btn svg { width: 17px; height: 17px; display: block; }
.icon-btn.off { color: var(--ink-faint); }
.icon-btn.on { color: var(--ink); border-color: var(--line-strong); }
.icon-btn.off::after {
  content: "";
  position: absolute;
  left: 7px; right: 7px; top: 50%;
  height: 1.4px;
  background: var(--ink-dim);
  transform: rotate(-42deg);
}

/* lives */
.diamonds { display: inline-flex; align-items: center; gap: 9px; }
.diamond {
  width: 8px; height: 8px;
  border: 1px solid var(--ink-dim);
  transform: rotate(45deg);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.diamond.full { background: var(--ink); border-color: var(--ink); }
.diamond.empty { border-color: var(--ink-faint); }
.diamond.crack { animation: crack 0.55s var(--ease-out) both; }
@keyframes crack {
  0%   { background: var(--ink); border-color: var(--ink); transform: rotate(45deg) scale(1); }
  30%  { transform: rotate(45deg) scale(1.7); }
  100% { background: transparent; border-color: var(--ink-faint); transform: rotate(45deg) scale(1); }
}

/* ———————————————————— screens ———————————————————— */

.screen {
  position: fixed; inset: 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.45s ease, visibility 0.45s;
  z-index: 10;
  overflow-y: auto;
}
.screen.active { opacity: 1; visibility: visible; }

/* ———————————————————— menu ———————————————————— */

.menu-wrap {
  width: min(580px, 90vw);
  margin: 0 auto;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 72px 0 48px;
  animation: rise 0.8s var(--ease-out) both;
}
@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.masthead { text-align: center; margin-bottom: 34px; }

.title {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 460;
  font-size: clamp(3.1rem, 9.5vw, 4.9rem);
  letter-spacing: -0.015em;
  line-height: 1.04;
  font-optical-sizing: auto;
}
.t-color {
  background-image: linear-gradient(100deg, var(--c1), var(--c2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  transition: none;
}
.tagline {
  margin-top: 14px;
  font-size: 10px;
  letter-spacing: 0.42em;
  color: var(--ink-dim);
}

/* preview */
.preview { margin-bottom: 30px; }
.preview-strip {
  position: relative;
  height: 58px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: linear-gradient(90deg, var(--c1), var(--c2));
}
.reroll {
  position: absolute;
  right: 9px; top: 50%;
  transform: translateY(-50%);
  width: 36px; height: 36px;
  display: grid; place-items: center;
  border-radius: 50%;
  color: var(--ink);
  background: rgba(14, 14, 17, 0.66);
  border: 1px solid var(--line);
  backdrop-filter: blur(2px);
  transition: background 0.25s ease, transform 0.25s ease;
}
.reroll:hover { background: rgba(14, 14, 17, 0.85); }
.reroll svg { width: 16px; height: 16px; }
.reroll.spin svg { animation: spin 0.55s var(--ease-out); }
.lockmark {
  display: grid;
  pointer-events: none;
  color: var(--ink-dim);
  background: rgba(14, 14, 17, 0.55);
}
@keyframes spin { from { transform: rotate(-300deg); } to { transform: rotate(0); } }

.ruler {
  display: flex;
  justify-content: space-between;
  height: 10px;
  margin-top: 7px;
  align-items: flex-start;
}
.tick { width: 1px; height: 6px; background: var(--ink-faint); }
.tick.major { height: 10px; background: var(--line-strong); }

.hex-row {
  display: flex;
  justify-content: space-between;
  margin-top: 6px;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
}

/* settings — spec sheet rows */
.settings { border-top: 1px solid var(--line); }
.set-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 64px;
  padding: 12px 2px;
  border-bottom: 1px solid var(--line);
}
.set-label {
  font-size: 10px;
  letter-spacing: 0.34em;
  color: var(--ink-dim);
}
.set-control { display: flex; align-items: center; gap: 16px; }
.set-control.col { flex-direction: column; align-items: flex-end; gap: 8px; }
.set-note {
  font-size: 9px;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* segmented control */
.seg { display: flex; border: 1px solid var(--line-strong); border-radius: 2px; overflow: hidden; }
.seg-btn {
  padding: 9px 16px;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  transition: background 0.25s ease, color 0.25s ease;
}
.seg-btn + .seg-btn { border-left: 1px solid var(--line-strong); }
.seg.compact .seg-btn { padding: 9px 10px; letter-spacing: 0.14em; }
.seg-btn.active { background: var(--ink); color: #121214; }
.seg-btn:not(.active):hover { color: var(--ink); }

/* swatches */
.swatches { display: flex; align-items: center; gap: 10px; }
.swatch { position: relative; display: block; width: 34px; height: 34px; cursor: pointer; }
.swatch input {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  opacity: 0;
  cursor: pointer;
}
.swatch-well {
  position: absolute; inset: 0;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  box-shadow: inset 0 0 0 3px var(--bg);
  background: #777;
  pointer-events: none;
  transition: transform 0.2s var(--ease-out);
}
.swatch:hover .swatch-well { transform: scale(1.08); }
.swatch-dash { width: 12px; height: 1px; background: var(--line-strong); }

/* slider */
.slider-wrap { gap: 18px; }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: clamp(150px, 30vw, 230px);
  height: 24px;
  background: transparent;
  cursor: pointer;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 1px;
  background: var(--line-strong);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 11px; height: 11px;
  background: var(--ink);
  border: none;
  border-radius: 1px;
  transform: rotate(45deg);
  margin-top: -5.5px;
  transition: transform 0.15s ease;
}
input[type="range"]::-webkit-slider-thumb:hover { transform: rotate(45deg) scale(1.25); }
input[type="range"]::-moz-range-track { height: 1px; background: var(--line-strong); }
input[type="range"]::-moz-range-thumb {
  width: 11px; height: 11px;
  background: var(--ink);
  border: none;
  border-radius: 1px;
  transform: rotate(45deg);
}
output {
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.1em;
  min-width: 2ch;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

/* dual-handle range (colour gap) */
.dual {
  position: relative;
  width: clamp(150px, 30vw, 230px);
  height: 24px;
}
.dual input[type="range"] {
  position: absolute;
  inset: 0;
  width: 100%;
  margin: 0;
  pointer-events: none;
}
.dual input[type="range"]::-webkit-slider-thumb { pointer-events: auto; }
.dual input[type="range"]::-moz-range-thumb { pointer-events: auto; }
.dual input[type="range"]:nth-child(2)::-webkit-slider-runnable-track { background: transparent; }
.dual input[type="range"]:nth-child(2)::-moz-range-track { background: transparent; }
#out-gap { min-width: 5ch; }

/* stepper */
.stepper { display: flex; align-items: center; border: 1px solid var(--line-strong); border-radius: 2px; }
.stepper button {
  width: 34px; height: 34px;
  font-size: 16px;
  color: var(--ink-dim);
  transition: color 0.2s ease, background 0.2s ease;
}
.stepper button:hover { color: var(--ink); background: rgba(233, 228, 218, 0.06); }
.stepper output { padding: 0 8px; font-size: 14px; }

.menu-warn {
  min-height: 22px;
  margin-top: 14px;
  text-align: center;
  font-size: 10px;
  letter-spacing: 0.22em;
  color: #cf8f6a;
}

/* buttons */
.btn {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  padding: 15px 30px;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--ink);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease,
              letter-spacing 0.3s ease, opacity 0.25s ease;
}
.btn:hover:not(:disabled) { background: var(--ink); color: #121214; border-color: var(--ink); letter-spacing: 0.36em; }
.btn:disabled { opacity: 0.3; cursor: default; }
.btn.primary { background: var(--ink); color: #121214; border-color: var(--ink); }
.btn.primary:hover:not(:disabled) { background: #fff; border-color: #fff; }

.begin { width: 100%; margin-top: 6px; }

.menu-foot {
  margin-top: 22px;
  text-align: center;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-faint);
  min-height: 15px;
}

/* daily challenge card */
.daily-card {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 28px 8px;
  margin-bottom: 6px;
  text-align: center;
}
.daily-date {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 440;
  font-size: 1.55rem;
  letter-spacing: 0.01em;
}
.daily-rules {
  margin-top: 12px;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--ink-dim);
}
.daily-perfect {
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.daily-result {
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.daily-result-line {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.daily-next {
  margin-top: 9px;
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}
.daily-rank {
  margin-top: 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* handle + leaderboard controls on the daily card */
.daily-net {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.handle-field { display: flex; align-items: center; gap: 10px; }
.handle-label { font-size: 9px; letter-spacing: 0.24em; color: var(--ink-faint); white-space: nowrap; }
#handle-input {
  width: 132px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink);
  font: inherit;
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 4px 2px;
}
#handle-input:focus { outline: none; border-bottom-color: var(--ink); }
.board-open { font-size: 10px; letter-spacing: 0.18em; white-space: nowrap; }

/* leaderboard standing in the result panel */
.panel-rank {
  margin: -16px 0 26px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* leaderboard overlay (reuses .panel-backdrop / .panel) */
.board-panel { width: min(460px, 92vw); text-align: left; }
.board-panel .panel-title { text-align: center; }
.board-sub {
  text-align: center;
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--ink-dim);
  margin-bottom: 18px;
}
.board-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  max-height: 46vh;
  overflow-y: auto;
}
.board-row {
  display: grid;
  grid-template-columns: 2.6em 1fr auto auto;
  gap: 12px;
  align-items: baseline;
  padding: 9px 6px;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}
.board-row.me { background: rgba(233, 228, 218, 0.06); }
.b-rank { color: var(--ink-faint); font-size: 10px; letter-spacing: 0.1em; }
.b-name { color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.b-moves { color: var(--ink); letter-spacing: 0.06em; }
.b-time { color: var(--ink-dim); letter-spacing: 0.06em; }

/* ad slot (kept hidden until ads are enabled + consented) */
.ad-slot { margin-top: 22px; text-align: center; min-height: 0; }

/* name prompt (reuses .panel-backdrop / .panel) */
.name-panel { width: min(420px, 90vw); text-align: center; }
#name-input {
  width: 100%;
  margin: 6px 0 4px;
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink);
  font: inherit;
  font-size: 18px;
  letter-spacing: 0.12em;
  text-align: center;
  padding: 10px 4px;
}
#name-input:focus { outline: none; border-bottom-color: var(--ink); }
.name-error {
  min-height: 16px;
  margin-bottom: 18px;
  font-size: 10px;
  letter-spacing: 0.18em;
  color: #cf8f6a;
}

/* consent banner */
.consent {
  position: fixed;
  left: 50%;
  bottom: 16px;
  transform: translate(-50%, 12px);
  width: min(620px, 92vw);
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 18px;
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s ease, transform 0.35s ease, visibility 0.35s;
}
.consent.show { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.consent-text {
  flex: 1 1 280px;
  font-size: 11px;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--ink-dim);
}
.consent-text a { color: var(--ink); }
.consent-actions { display: flex; gap: 10px; }
.consent .btn { padding: 11px 18px; }

/* ———————————————————— game stage ———————————————————— */

.stage {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 76px 0 36px;
}

.toast {
  min-height: 20px;
  margin-bottom: 26px;
  font-size: 10.5px;
  letter-spacing: 0.28em;
  color: var(--ink-dim);
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.4s ease, transform 0.4s ease;
  text-align: center;
  padding: 0 16px;
}
.toast.show { opacity: 1; transform: translateY(0); }

.strip-frame {
  width: min(1080px, 92vw);
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgba(233, 228, 218, 0.022);
  transition: box-shadow 0.8s ease;
}
.strip-frame.enter { animation: strip-in 0.75s var(--ease-out) both; }
@keyframes strip-in {
  from { opacity: 0; transform: translateY(12px) scale(0.988); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.strip-frame.shake { animation: shake-x 0.55s ease both; }
@keyframes shake-x {
  0% { transform: translateX(0); }
  16% { transform: translateX(-9px); }
  32% { transform: translateX(8px); }
  48% { transform: translateX(-6px); }
  64% { transform: translateX(4px); }
  80% { transform: translateX(-2px); }
  100% { transform: translateX(0); }
}
.strip-frame.pulse { animation: frame-pulse 1s var(--ease-out) both; }
@keyframes frame-pulse {
  0%   { transform: scale(1); box-shadow: 0 0 0 rgba(233, 228, 218, 0); }
  30%  { transform: scale(1.013); box-shadow: 0 0 60px rgba(233, 228, 218, 0.14); }
  100% { transform: scale(1); box-shadow: 0 0 0 rgba(233, 228, 218, 0); }
}

.strip {
  position: relative;
  height: var(--strip-h);
  perspective: 1100px;
}
.strip.dimmed { filter: saturate(0.82) brightness(0.74); transition: filter 1.2s ease; }

.bars { position: absolute; inset: 0; }

/* bars */
.bar {
  position: absolute;
  top: 0;
  height: 100%;
  z-index: 1;
  will-change: transform;
  transition-property: transform, width;
  transition-duration: 450ms;
  transition-timing-function: var(--ease-out);
  cursor: grab;
  touch-action: none;
}
.bar.locked { cursor: default; }
.bar.dragging { z-index: 40; cursor: grabbing; }

.flip {
  position: absolute; inset: 0;
  transform-style: preserve-3d;
  transition: transform 0.46s var(--ease-out);
}
.bar.flipped .flip { transform: rotateY(180deg); }

.face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 2px;
  transition: border-radius 0.5s ease, box-shadow 0.3s ease, transform 0.18s ease;
}
.face.back {
  transform: rotateY(180deg);
  background:
    repeating-linear-gradient(48deg,
      rgba(233, 228, 218, 0.085) 0 1px,
      transparent 1px 8px),
    #1e1e25;
  border: 1px solid rgba(233, 228, 218, 0.14);
}

/* flat overlay: on harder difficulties each bar is quantized to a single
   colour, killing the seam-continuity cue. It melts away on a win. */
.face.front .flat {
  position: absolute; inset: 0;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.45s ease;
}
.bar.flattened .flat { opacity: 1; }
.strip.solid .flat { transition-duration: 0.95s; }

/* interaction affordances must never alter the colours being judged —
   geometry only: lifts, outlines and shadows, no filters */
.strip.playing .bar:not(.locked):not(.dragging):hover .face.front { transform: translateY(-4px); }
.strip.playing .bar:not(.locked):active { cursor: grabbing; }

.bar.dragging .face.front {
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55), 0 2px 10px rgba(0, 0, 0, 0.4);
}
.bar.selected .face.front {
  outline: 1.5px solid var(--ink);
  outline-offset: 3px;
  animation: sel-pulse 1.5s ease-in-out infinite;
}
@keyframes sel-pulse {
  0%, 100% { outline-color: rgba(233, 228, 218, 0.95); }
  50%      { outline-color: rgba(233, 228, 218, 0.35); }
}
.bar.kcur .face.front { outline: 1px dotted var(--ink-dim); outline-offset: 6px; }

.bar.deny { animation: deny 0.3s ease both; }
@keyframes deny {
  0%, 100% { margin-left: 0; }
  30% { margin-left: -3px; }
  70% { margin-left: 3px; }
}

/* lock glyph on the fixed end bars */
.bar.locked .face.front::after {
  content: "";
  position: absolute;
  left: 50%; bottom: 7px;
  width: 9px; height: 11px;
  transform: translateX(-50%);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 9 11'%3E%3Crect x='0.6' y='4.6' width='7.8' height='5.8' rx='1' fill='none' stroke='white' stroke-width='1.1'/%3E%3Cpath d='M2.5 4.5V3a2 2 0 0 1 4 0v1.5' fill='none' stroke='white' stroke-width='1.1'/%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  opacity: 0.42;
  mix-blend-mode: difference;
}

/* win: solidify */
.strip.solid .face { border-radius: 0; }

/* confirm cascade on correct submit */
.bar.confirm .face.front { animation: confirm-flash 0.55s ease both; }
@keyframes confirm-flash {
  0%   { filter: brightness(1); }
  35%  { filter: brightness(1.55); }
  100% { filter: brightness(1); }
}

/* ———————————————————— fx layer ———————————————————— */

.fxlayer {
  position: absolute; inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 30;
  border-radius: 2px;
}

.seams { position: absolute; inset: 0; opacity: 1; transition: opacity 0.45s ease; }
.seams.fade { opacity: 0; }
.seam {
  position: absolute;
  top: 0; bottom: 0;
  width: 1.5px;
  margin-left: -0.75px;
  background: rgba(10, 10, 12, 0.9);
  transform: scaleY(0);
  transition: transform 0.34s var(--ease-out);
}
.seam.in { transform: scaleY(1); }

.sweep {
  position: absolute;
  top: -8%; bottom: -8%;
  width: 34%;
  left: -40%;
  background: linear-gradient(102deg, transparent 0%, rgba(255, 255, 255, 0.11) 50%, transparent 100%);
  opacity: 0;
}
.sweep.run { animation: sweep-x 1.05s ease-in-out both; }
@keyframes sweep-x {
  0%   { left: -40%; opacity: 0; }
  12%  { opacity: 1; }
  88%  { opacity: 1; }
  100% { left: 108%; opacity: 0; }
}

.scanband {
  position: absolute;
  top: 0; bottom: 0;
  width: 13%;
  left: -15%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  opacity: 0;
}
.scanband.run { animation: scan-x 0.72s cubic-bezier(0.6, 0.05, 0.4, 0.95) both; }
@keyframes scan-x {
  0%   { left: -15%; opacity: 0; }
  10%  { opacity: 1; }
  90%  { opacity: 1; }
  100% { left: 103%; opacity: 0; }
}

.bloom {
  position: absolute; inset: -4px;
  background: radial-gradient(62% 120% at 50% 50%, rgba(255, 255, 255, 0.34), transparent 70%);
  opacity: 0;
}
.bloom.run { animation: bloom-k 0.95s ease-out both; }
@keyframes bloom-k {
  0%   { opacity: 0; }
  18%  { opacity: 1; }
  100% { opacity: 0; }
}

/* ———————————————————— under-strip instrumentation ———————————————————— */

.game-ruler { width: calc(min(1080px, 92vw) - 22px); }
.game-hexes { width: calc(min(1080px, 92vw) - 22px); }

.actions {
  margin-top: 38px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.submit { min-width: 224px; }
.reset { margin-top: 14px; }
.reset:disabled { opacity: 0.3; pointer-events: none; }

/* ———————————————————— panel ———————————————————— */

.panel-backdrop {
  position: fixed; inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  background: rgba(8, 8, 10, 0.55);
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s ease, visibility 0.4s;
}
.panel-backdrop.show { opacity: 1; visibility: visible; }

.panel {
  width: min(440px, 88vw);
  padding: 44px 40px 38px;
  text-align: center;
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: 4px;
  transform: translateY(12px);
  transition: transform 0.45s var(--ease-out);
}
.panel-backdrop.show .panel { transform: translateY(0); }

.panel-title {
  font-family: var(--serif);
  font-style: italic;
  font-weight: 420;
  font-size: 2.1rem;
  line-height: 1.15;
  margin-bottom: 16px;
}
.panel-sub {
  font-size: 10px;
  letter-spacing: 0.24em;
  line-height: 2.1;
  color: var(--ink-dim);
  margin-bottom: 30px;
  white-space: pre-line;
}
.panel-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ———————————————————— misc ———————————————————— */

#fx {
  position: fixed; inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
  z-index: 70;
}

.noscript {
  position: fixed;
  inset: auto 0 40px;
  text-align: center;
  color: var(--ink-dim);
}

/* ———————————————————— responsive ———————————————————— */

@media (max-width: 640px) {
  .top { padding: 12px 12px; }
  .top-center { gap: 10px; font-size: 10px; letter-spacing: 0.16em; }
  .menu-wrap { padding-top: 64px; }
  .set-row { flex-wrap: wrap; min-height: 0; padding: 14px 2px; }
  .set-control { width: 100%; justify-content: space-between; }
  .stage { padding-top: 64px; }
  .actions { margin-top: 28px; }
  :root { --strip-h: clamp(110px, 20vh, 160px); }
  /* the mode toggle now holds three options — tighten it to fit */
  #seg-game .seg-btn { padding: 9px 11px; letter-spacing: 0.1em; }
}

/* perfect intensity: the move counter */
.moves-line {
  margin-bottom: 14px;
  text-align: center;
  font-size: 10.5px;
  letter-spacing: 0.28em;
  color: var(--ink-dim);
  font-variant-numeric: tabular-nums;
}
.moves-line.low { color: #cf8f6a; }

/* ———————————————————— celebration stamp ———————————————————— */

.stamp {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  z-index: 45;
  pointer-events: none;
  font-family: var(--serif);
  font-style: italic;
  font-weight: 460;
  font-size: clamp(2.4rem, 7vw, 4rem);
  color: var(--ink);
  text-shadow: 0 2px 26px rgba(10, 10, 12, 0.8);
  opacity: 0;
}
.stamp.gold {
  color: #f2dfae;
  text-shadow: 0 2px 26px rgba(10, 10, 12, 0.75), 0 0 36px rgba(255, 218, 138, 0.5);
}
.stamp.show { animation: stamp-in 1.9s var(--ease-out) both; }
@keyframes stamp-in {
  0%   { opacity: 0; transform: scale(0.92); letter-spacing: 0; }
  16%  { opacity: 1; }
  72%  { opacity: 1; transform: scale(1.03); letter-spacing: 0.04em; }
  100% { opacity: 0; transform: scale(1.06); letter-spacing: 0.05em; }
}

/* ———————————————————— quick motion setting ———————————————————— */

body.fast .flip { transition-duration: 0.2s; }
body.fast .seam { transition-duration: 0.16s; }
body.fast .face.front .flat { transition-duration: 0.2s; }
body.fast .strip.solid .flat { transition-duration: 0.45s; }
body.fast .sweep.run { animation-duration: 0.5s; }
body.fast .scanband.run { animation-duration: 0.4s; }
body.fast .bloom.run { animation-duration: 0.55s; }
body.fast .strip-frame.enter { animation-duration: 0.4s; }

/* ———————————————————— reduced motion ———————————————————— */

/* decorative loops only — game animation speed is the MOTION setting */
@media (prefers-reduced-motion: reduce) {
  .bg-grain { animation: none; }
  .bg-glow { animation: none; }
  .menu-wrap { animation: none; }
}