/* ======================================================================
   VidiMahjong — theme tokens, lifted from ividi.dev's dark/amber palette
   ====================================================================== */

:root {
  --bg: #0a0a0f;
  --bg-panel: #0d0d18;
  --bg-panel-2: #12121f;
  --border: rgba(226, 232, 240, 0.10);
  --border-strong: rgba(226, 232, 240, 0.18);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --text-faint: #5b6474;
  --accent: #f59e0b;
  --accent-light: #fbbf24;
  --accent-dark: #b45309;
  --accent-glow: rgba(245, 158, 11, 0.35);
  --danger: #ef4444;
  --ok: #22c55e;

  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --font-body: Arial, Helvetica, sans-serif;
  --font-tile: "PingFang SC", "Heiti SC", "Songti SC", "STSong", "Microsoft YaHei", "SimSun", "Noto Sans CJK SC", "Noto Serif SC", "WenQuanYi Micro Hei", "Droid Sans Fallback", "PMingLiU", "Apple SD Gothic Neo", Georgia, serif;

  --tile-w: 54px;
  --tile-h: 74px;
  --tile-step-x: 46px;
  --tile-step-y: 34px;
  --layer-nudge: 7px;

  --radius: 10px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
button { font-family: inherit; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.hidden { display: none !important; }

#app { position: relative; width: 100%; height: 100%; }

.bg-glow {
  position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(600px 400px at 15% 10%, rgba(245, 158, 11, 0.10), transparent 60%),
    radial-gradient(500px 500px at 85% 90%, rgba(59, 130, 246, 0.06), transparent 60%);
}

.screen {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center;
  overflow: hidden;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* ======================================================================
   Splash
   ====================================================================== */

.splash-screen {
  justify-content: center;
  background: var(--bg);
  animation: none;
}
.splash-screen.leaving { animation: splashOut .6s var(--ease) forwards; }
@keyframes splashOut { to { opacity: 0; transform: scale(1.03); } }

.splash-tiles { position: absolute; inset: 0; pointer-events: none; z-index: 1; }
.splash-flying-tile {
  position: absolute;
  width: var(--tile-w); height: var(--tile-h);
  border-radius: 8px;
  background: linear-gradient(160deg, #fdf8ec, #eee0c0 60%, #ddcda0);
  box-shadow: 0 10px 26px rgba(0,0,0,.5);
  opacity: 0;
  animation: flyIn .9s var(--ease) forwards;
}
@keyframes flyIn {
  0% { opacity: 0; transform: translate3d(var(--fx,0), var(--fy,0), 0) rotate(var(--fr, 0deg)) scale(.6); }
  60% { opacity: 1; }
  100% { opacity: .9; transform: translate3d(0,0,0) rotate(0deg) scale(1); }
}

.splash-content {
  position: relative; z-index: 2;
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
  animation: contentIn 1s var(--ease) both; animation-delay: .5s;
  opacity: 0;
}
@keyframes contentIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }

.brand-logo {
  font-family: var(--font-body);
  font-weight: 900;
  font-size: clamp(2.6rem, 8vw, 4.6rem);
  letter-spacing: -.02em;
  margin: 0;
  line-height: 1;
}
.brand-vidi { color: var(--text); }
.brand-mahjong { color: var(--accent); }

.splash-tagline {
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin: .9rem 0 0;
  font-size: clamp(.85rem, 2vw, 1rem);
}

.splash-credit {
  margin-top: 3rem;
  opacity: 0;
  animation: contentIn .9s var(--ease) both; animation-delay: 1.6s;
}
.credit-line {
  font-family: var(--font-mono);
  color: var(--text-faint);
  font-size: .8rem;
  margin: 0;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.credit-name {
  font-family: var(--font-mono);
  color: var(--text);
  font-weight: 700;
  font-size: 1rem;
  margin: .3rem 0 .6rem;
}
.credit-links {
  font-family: var(--font-mono);
  font-size: .82rem;
  color: var(--text-dim);
}
.credit-links .dot { margin: 0 .5em; color: var(--text-faint); }

.splash-skip {
  position: absolute; bottom: 2.4rem; left: 50%; transform: translateX(-50%);
  background: none; border: 1px solid var(--border); color: var(--text-faint);
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .06em;
  padding: .5rem 1rem; border-radius: 999px; cursor: pointer;
  opacity: 0; animation: contentIn .8s var(--ease) both; animation-delay: 2.4s;
  transition: color .2s, border-color .2s;
}
.splash-skip:hover { color: var(--text); border-color: var(--border-strong); }

/* ======================================================================
   Menu
   ====================================================================== */

.menu-screen {
  justify-content: safe center;
  overflow-y: auto;
  animation: fadeIn .5s var(--ease);
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.lang-toggle {
  position: absolute; top: 1.4rem; right: 1.4rem; z-index: 5;
  display: flex; align-items: center;
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px; cursor: pointer;
  font-family: var(--font-mono); font-size: .78rem; font-weight: 700;
}
.lang-opt { position: relative; z-index: 1; padding: .4rem .75rem; color: var(--text-faint); transition: color .25s; }
.lang-opt.active { color: #0a0a0f; }
.lang-pill {
  position: absolute; top: 3px; left: 3px; height: calc(100% - 6px); width: calc(50% - 3px);
  background: var(--accent); border-radius: 999px;
  transition: transform .28s var(--ease);
}
.lang-toggle[data-lang="en"] .lang-pill { transform: translateX(100%); }

.menu-content {
  position: relative; z-index: 2;
  display: flex; flex-direction: column; align-items: center; text-align: center;
  margin: 3.5rem 0 4rem;
  flex-shrink: 0;
}
.eyebrow {
  font-family: var(--font-mono); color: var(--accent);
  letter-spacing: .18em; font-size: .72rem; margin: 0 0 .6rem;
}
.brand-logo--menu { font-size: clamp(2.4rem, 7vw, 3.6rem); }
.menu-subtitle {
  font-family: var(--font-mono); color: var(--text-dim);
  margin: .7rem 0 0; font-size: .92rem;
}

.difficulty-picker { margin-top: 1.6rem; display: flex; flex-direction: column; align-items: center; gap: .5rem; }
.difficulty-label {
  font-family: var(--font-mono); color: var(--text-faint);
  letter-spacing: .1em; font-size: .68rem; text-transform: uppercase; margin: 0;
}
.difficulty-options {
  display: flex; flex-wrap: wrap; justify-content: center; background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: 999px; padding: 3px; gap: 2px;
}
.difficulty-option {
  font-family: var(--font-mono); font-size: .78rem; font-weight: 700;
  color: var(--text-faint); background: transparent; border: none; cursor: pointer;
  padding: .45rem 1rem; border-radius: 999px; transition: background .2s, color .2s;
}
.difficulty-option:hover { color: var(--text); }
.difficulty-option.active { background: var(--accent); color: #14100a; }

.menu-buttons { display: flex; flex-direction: column; gap: .8rem; margin-top: 1.6rem; width: min(320px, 80vw); }

.btn {
  font-family: var(--font-mono); font-weight: 700; font-size: .92rem;
  padding: .85rem 1.6rem; border-radius: 10px; cursor: pointer;
  border: 1px solid transparent; letter-spacing: .02em;
  display: flex; align-items: center; justify-content: center; text-decoration: none;
  transition: transform .15s var(--ease), box-shadow .15s var(--ease), background .2s, border-color .2s;
}
.btn:active { transform: scale(.97); }
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #14100a; box-shadow: 0 8px 24px var(--accent-glow); }
.btn-primary:hover { background: var(--accent-light); box-shadow: 0 10px 30px var(--accent-glow); }
.btn-secondary { background: var(--bg-panel-2); color: var(--text); border-color: var(--border-strong); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn-ghost { background: transparent; color: var(--text-dim); border-color: var(--border-strong); }
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }

.app-footer, .menu-screen .app-footer {
  position: absolute; bottom: 1.6rem; left: 0; right: 0; text-align: center;
  font-family: var(--font-mono); font-size: .74rem; color: var(--text-faint);
}
.app-footer a { color: var(--text-dim); }
.app-footer a:hover { color: var(--accent); }
.dot { margin: 0 .5em; opacity: .5; }

/* ======================================================================
   How to play
   ====================================================================== */

.htp-screen { animation: fadeIn .35s var(--ease); align-items: stretch; }
.sub-header {
  display: flex; align-items: center; gap: 1rem;
  padding: 1.1rem 1.2rem; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.sub-header h2 { margin: 0; font-size: 1.1rem; font-family: var(--font-mono); }
.sub-header-spacer { width: 40px; }

.htp-body {
  flex: 1 1 auto; min-height: 0; overflow-y: auto;
  padding: 1.4rem 1.4rem 3rem; max-width: 640px; margin: 0 auto; width: 100%;
}
.htp-tabs { display: flex; gap: .5rem; margin-bottom: 1.2rem; border-bottom: 1px solid var(--border); }
.htp-tab {
  font-family: var(--font-mono); font-weight: 700; font-size: .82rem;
  background: transparent; border: none; cursor: pointer; color: var(--text-dim);
  padding: .7rem .3rem; border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color .2s, border-color .2s;
}
.htp-tab:hover { color: var(--text); }
.htp-tab.active { color: var(--accent); border-bottom-color: var(--accent); }
.htp-intro { color: var(--text-dim); line-height: 1.6; }
.htp-section { margin-top: 2rem; }
.htp-section h3 { font-family: var(--font-mono); color: var(--accent); font-size: .95rem; margin-bottom: .6rem; }
.htp-section p { color: var(--text-dim); line-height: 1.6; margin: 0; }

.htp-diagram { display: flex; gap: 1.2rem; margin-top: 1.2rem; flex-wrap: wrap; }
.htp-example { flex: 1 1 140px; text-align: center; background: var(--bg-panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem .6rem; }
.mini-board { position: relative; height: 70px; display: flex; align-items: flex-end; justify-content: center; margin-bottom: .8rem; }
.mini-tile { position: absolute; width: 34px; height: 46px; border-radius: 5px; background: linear-gradient(160deg, #fdf8ec, #eee0c0 60%, #ddcda0); box-shadow: 0 6px 14px rgba(0,0,0,.4); }
.mini-tile--base { bottom: 0; }
.mini-tile--top { bottom: 14px; left: 50%; transform: translateX(-50%); box-shadow: 0 8px 18px rgba(0,0,0,.5); }
.mini-tile--side { position: static; margin: 0 -2px; }
.mini-board--blocked { gap: 0; }
.mini-tile--center.is-blocked { outline: 2px solid var(--danger); z-index: 2; }
.mini-tile--center.is-free { outline: 2px solid var(--ok); box-shadow: 0 0 16px rgba(34,197,94,.5); }
.mini-board--free { gap: -6px; }
.mini-label { font-family: var(--font-mono); font-weight: 700; font-size: .8rem; margin: 0 0 .3rem; color: var(--text); }
.mini-desc { font-size: .76rem; color: var(--text-faint); margin: 0; line-height: 1.4; }

.htp-tools { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: .7rem; }
.htp-tools li { color: var(--text-dim); line-height: 1.5; font-size: .92rem; }
.htp-tools strong { color: var(--accent); font-family: var(--font-mono); }

.htp-close { margin-top: 2.4rem; width: 100%; }

/* ======================================================================
   Level select
   ====================================================================== */

.levels-screen { animation: fadeIn .35s var(--ease); align-items: stretch; }
.levels-subtitle {
  font-family: var(--font-mono); color: var(--text-dim); font-size: .84rem;
  text-align: center; margin: 1.2rem auto 0; max-width: 480px; padding: 0 1.4rem; line-height: 1.5;
}
.levels-complete-label {
  font-family: var(--font-mono); color: var(--accent); font-size: .84rem; font-weight: 700;
  text-align: center; margin: .6rem 0 0;
}
.levels-grid {
  flex: 1 1 auto; min-height: 0; overflow-y: auto;
  max-width: 480px; margin: 0 auto; width: 100%;
  padding: 1.4rem 1.4rem 3rem;
}
.levels-tier-label {
  font-family: var(--font-mono); color: var(--text-faint); letter-spacing: .1em;
  text-transform: uppercase; font-size: .7rem; font-weight: 700; margin: 1.2rem 0 .5rem;
}
.levels-tier-label:first-child { margin-top: 0; }
.levels-tier-row {
  display: grid; grid-template-columns: repeat(5, 1fr); gap: .5rem;
}
.level-tile {
  font-family: var(--font-mono); font-weight: 700; font-size: .92rem;
  height: 52px; display: flex; align-items: center; justify-content: center;
  background: var(--bg-panel-2); border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); cursor: pointer; transition: border-color .15s, color .15s;
}
.level-tile:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.level-tile:disabled { color: var(--text-faint); cursor: default; opacity: .6; }
.level-tile.is-cleared { background: var(--accent-glow); border-color: var(--accent); color: var(--accent); }

/* ======================================================================
   Game screen
   ====================================================================== */

.game-screen { animation: fadeIn .35s var(--ease); }

.game-header {
  width: 100%; flex-shrink: 0;
  display: flex; align-items: center; gap: .8rem;
  padding: .7rem 1rem; border-bottom: 1px solid var(--border);
  background: var(--bg-panel);
  flex-wrap: wrap;
}
.icon-btn {
  display: flex; align-items: center; gap: .35rem;
  background: var(--bg-panel-2); border: 1px solid var(--border);
  color: var(--text-dim); border-radius: 8px; padding: .5rem .6rem;
  cursor: pointer; position: relative;
  transition: color .15s, border-color .15s, background .15s, transform .1s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn:active { transform: scale(.94); }
.icon-btn:disabled { opacity: .35; cursor: default; pointer-events: none; }
.badge {
  font-family: var(--font-mono); font-size: .65rem; font-weight: 700;
  background: var(--accent); color: #14100a; border-radius: 999px;
  min-width: 16px; height: 16px; display: flex; align-items: center; justify-content: center;
  position: absolute; top: -5px; right: -5px; padding: 0 3px;
}

.game-stats { display: flex; gap: 1.2rem; margin: 0 auto; flex-wrap: wrap; }
.stat { display: flex; flex-direction: column; align-items: center; font-family: var(--font-mono); line-height: 1.2; }
.stat-label { font-size: .62rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: .06em; }
.stat-value { font-size: 1rem; font-weight: 700; color: var(--text); font-variant-numeric: tabular-nums; }

.game-actions { display: flex; gap: .5rem; margin-left: auto; }

.board-wrap {
  flex: 1; width: 100%; overflow: auto; position: relative;
  display: flex; align-items: flex-start; justify-content: safe center;
  padding: 2rem 1rem 3rem;
}
.board {
  position: relative;
  transform-origin: top center;
}

/* ======================================================================
   Tiles
   ====================================================================== */

.tile {
  position: absolute;
  width: var(--tile-w); height: var(--tile-h);
  border-radius: calc(var(--tile-w) * 0.13);
  background:
    radial-gradient(120% 90% at 30% 15%, rgba(255,255,255,.85), rgba(255,255,255,0) 55%),
    linear-gradient(165deg, #fefaf0 0%, #f6ecd4 40%, #e9d9ae 72%, #d6c188 100%);
  box-shadow:
    0 1px 0 rgba(255,255,255,.75) inset,
    1px 0 0 rgba(255,255,255,.35) inset,
    -1px 0 0 rgba(120,100,60,.12) inset,
    0 -4px 0 rgba(0,0,0,.09) inset,
    0 2px 0 #cbb789,
    0 5px 0 #a8946a,
    0 6px 1px #8a7852,
    0 9px 14px rgba(0,0,0,.4);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform .16s var(--ease), box-shadow .16s var(--ease), filter .2s;
  will-change: transform;
}
.tile::after {
  content: ""; position: absolute; inset: 3px;
  border: 1px solid rgba(120, 100, 60, .18); border-radius: calc(var(--tile-w) * 0.1);
  box-shadow: 0 1px 0 rgba(255,255,255,.5) inset;
  pointer-events: none;
}
.tile-face {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-tile);
}

.tile.is-covered-visual { filter: brightness(.8) saturate(.85); }
.tile.is-blocked-visual { filter: brightness(.94); }

.tile.is-free:hover {
  transform: translateY(-5px) scale(1.04);
  box-shadow:
    0 1px 0 rgba(255,255,255,.75) inset,
    1px 0 0 rgba(255,255,255,.35) inset,
    -1px 0 0 rgba(120,100,60,.12) inset,
    0 -4px 0 rgba(0,0,0,.09) inset,
    0 2px 0 #cbb789,
    0 5px 0 #a8946a,
    0 6px 1px #8a7852,
    0 16px 24px rgba(0,0,0,.45);
}
.tile.is-blocked { cursor: default; }

.tile.is-selected {
  transform: translateY(-10px) scale(1.06);
  box-shadow:
    0 0 0 3px var(--accent),
    0 1px 0 rgba(255,255,255,.75) inset,
    0 -4px 0 rgba(0,0,0,.09) inset,
    0 2px 0 var(--accent-light),
    0 5px 0 var(--accent-dark),
    0 16px 30px var(--accent-glow);
  z-index: 999 !important;
}

.tile.is-hint {
  animation: hintPulse 1s ease-in-out infinite;
  z-index: 998 !important;
}
@keyframes hintPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34,197,94,.7), 0 4px 0 #a8946a, 0 6px 10px rgba(0,0,0,.35); }
  50% { box-shadow: 0 0 0 6px rgba(34,197,94,0), 0 4px 0 #a8946a, 0 6px 10px rgba(0,0,0,.35); }
}

.tile.is-mismatch { animation: shake .4s var(--ease); }
@keyframes shake {
  10%, 90% { transform: translateX(-3px); }
  20%, 80% { transform: translateX(5px); }
  30%, 50%, 70% { transform: translateX(-7px); }
  40%, 60% { transform: translateX(7px); }
}

.tile.is-matched {
  animation: matchAway .45s var(--ease) forwards;
  pointer-events: none;
  z-index: 997 !important;
}
@keyframes matchAway {
  0% { transform: translateY(0) scale(1); opacity: 1; }
  40% { transform: translateY(-22px) scale(1.12); opacity: 1; }
  100% { transform: translateY(-60px) scale(.4) rotate(12deg); opacity: 0; }
}

.tile.is-dealing {
  animation: dealIn .5s var(--ease) backwards;
}
@keyframes dealIn {
  from { opacity: 0; transform: translateY(-40px) scale(.7) rotate(-6deg); }
  to { opacity: 1; transform: translateY(0) scale(1) rotate(0); }
}

/* Tile glyph styling */
.glyph-solo { font-size: calc(var(--tile-w) * 0.52); line-height: 1; font-weight: 700; }
.glyph-solo.bonus { display: flex; flex-direction: column; align-items: center; font-size: calc(var(--tile-w) * 0.44); }
.glyph-solo.bonus i { font-style: normal; font-family: var(--font-mono); font-size: .5rem; color: var(--accent-dark); margin-top: -2px; }
.glyph-stack { display: flex; flex-direction: column; align-items: center; line-height: 1; }
.glyph-num { font-size: calc(var(--tile-w) * 0.34); font-weight: 700; }
.glyph-suit { font-size: calc(var(--tile-w) * 0.3); margin-top: 1px; }
.pip-art { width: 74%; height: 74%; }
.dragon-blank { width: 58%; height: 68%; border: 3px solid #1d5fa8; border-radius: 3px; }

/* ======================================================================
   Modals & toast
   ====================================================================== */

.modal-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(5, 5, 10, .72); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  animation: fadeIn .25s var(--ease);
}
.modal {
  position: relative;
  background: var(--bg-panel); border: 1px solid var(--border-strong);
  border-radius: 16px; padding: 2rem 1.8rem; width: min(380px, 88vw);
  text-align: center;
  animation: modalIn .35s var(--ease);
  box-shadow: 0 30px 70px rgba(0,0,0,.6);
}
@keyframes modalIn { from { opacity: 0; transform: translateY(16px) scale(.96); } to { opacity: 1; transform: translateY(0) scale(1); } }
.modal h2 { margin: 0 0 .4rem; font-family: var(--font-mono); color: var(--accent); font-size: 1.4rem; }
.modal p { color: var(--text-dim); margin: 0 0 1.2rem; line-height: 1.5; font-size: .9rem; }
.modal-stats { display: flex; justify-content: space-between; gap: .6rem; margin-bottom: 1.4rem; }
.modal-stats > div { flex: 1; background: var(--bg-panel-2); border-radius: 10px; padding: .7rem .4rem; }
.modal-stats span { display: block; font-family: var(--font-mono); font-size: .62rem; color: var(--text-faint); text-transform: uppercase; }
.modal-stats strong { font-family: var(--font-mono); font-size: 1.05rem; color: var(--text); }
.modal-actions { display: flex; flex-direction: column; gap: .6rem; }

.leaderboard-block {
  background: var(--bg-panel-2); border: 1px solid var(--border-strong);
  border-radius: 12px; padding: .8rem; margin-bottom: 1.4rem;
}
.leaderboard-block .modal-stats { margin-bottom: 0; }
.leaderboard-block .modal-stats > div { background: transparent; padding: .3rem .4rem; }
.leaderboard-title {
  font-family: var(--font-mono); font-size: .68rem; font-weight: 700; color: var(--accent);
  text-transform: uppercase; letter-spacing: .05em; text-align: center; margin: 0 0 .6rem;
}
#confetti-canvas { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }

.toast {
  position: fixed; bottom: 1.6rem; left: 50%; transform: translateX(-50%);
  background: var(--bg-panel-2); border: 1px solid var(--border-strong);
  color: var(--text); font-family: var(--font-mono); font-size: .82rem;
  padding: .7rem 1.2rem; border-radius: 999px; z-index: 10000;
  animation: toastIn .25s var(--ease);
  box-shadow: 0 10px 30px rgba(0,0,0,.4);
}
@keyframes toastIn { from { opacity: 0; transform: translateX(-50%) translateY(10px); } to { opacity: 1; transform: translateX(-50%) translateY(0); } }

/* ======================================================================
   Responsive
   ====================================================================== */

@media (max-width: 640px) {
  .game-header { justify-content: center; }
  .game-stats { order: 3; width: 100%; justify-content: center; }
  .game-actions { margin-left: 0; }
  .modal-stats { flex-direction: row; }

  .menu-content { margin: 1.6rem 0 2rem; }
  .difficulty-picker { margin-top: 1rem; }
  .menu-buttons { margin-top: 1.2rem; gap: .6rem; }
}

@media (max-height: 700px) {
  .menu-content { margin: 3.4rem 0 1rem; }
  .difficulty-picker { margin-top: .8rem; }
  .menu-buttons { margin-top: 1rem; gap: .5rem; }
}

/* Below this the fixed-position footer can collide with a vertically
   centered menu-content block that's still taller than the viewport —
   drop the credits so the actual buttons stay unobstructed. */
@media (max-height: 460px) {
  .menu-screen .app-footer { display: none; }
}

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