/* ==========================================================================
   ARCADE — shared design system for AI Study Method quiz games
   Dark, neon, high-contrast, built so vertical screen recordings of play
   look great on TikTok. Loaded AFTER ../../style.css so it can re-skin
   the site nav for game pages.
   Class prefix: ar-
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;700&display=swap');

:root {
  --ar-bg:        #06060f;
  --ar-bg2:       #0c0c1d;
  --ar-card:      #11112b;
  --ar-card2:     #181838;
  --ar-border:    rgba(255,255,255,0.09);
  --ar-border-hi: rgba(255,255,255,0.18);

  --ar-mint:      #00ffa3;   /* primary "correct"/go colour            */
  --ar-mint-dim:  rgba(0,255,163,0.14);
  --ar-pink:      #ff2e88;   /* danger / lie / wrong                   */
  --ar-pink-dim:  rgba(255,46,136,0.14);
  --ar-gold:      #ffd60a;   /* streaks, coins, bests                  */
  --ar-gold-dim:  rgba(255,214,10,0.14);
  --ar-cyan:      #00e5ff;   /* info / timers / selection              */
  --ar-cyan-dim:  rgba(0,229,255,0.12);
  --ar-violet:    #8b5cf6;

  --ar-text:      #f2f3ff;
  --ar-text2:     #aab0d8;
  --ar-muted:     #767ca8;

  --ar-grad:      linear-gradient(135deg, #00ffa3 0%, #00e5ff 100%);
  --ar-grad-hot:  linear-gradient(135deg, #ff2e88 0%, #ffd60a 100%);
  --ar-grad-card: linear-gradient(180deg, #141432 0%, #0c0c1d 100%);

  --ar-font:      'Space Grotesk', 'DM Sans', sans-serif;
  --ar-mono:      'DM Mono', monospace;

  --ar-r:    16px;
  --ar-r-lg: 22px;
}

/* ---------- page + nav re-skin ----------------------------------------- */
body.arcade {
  background: var(--ar-bg);
  color: var(--ar-text);
  font-family: var(--ar-font);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(139,92,246,0.16) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 90% 110%, rgba(0,229,255,0.07) 0%, transparent 60%);
  background-attachment: fixed;
  min-height: 100vh;
}
body.arcade nav { background: rgba(6,6,15,0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--ar-border); }
body.arcade nav .logo-primary   { color: var(--ar-text); }
body.arcade nav .logo-secondary { color: var(--ar-muted); }
body.arcade nav .nav-links a    { color: var(--ar-text2); }
body.arcade nav .nav-links a:hover { color: var(--ar-mint); }
body.arcade nav .btn-primary    { background: var(--ar-grad); color: #06121c; border: none; font-weight: 700; }
body.arcade ::selection { background: var(--ar-mint); color: #06121c; }

/* ---------- layout ------------------------------------------------------ */
.ar-wrap { max-width: 640px; margin: 0 auto; padding: calc(var(--nav-h, 68px) + 28px) 1.1rem 90px; }

/* ---------- header ------------------------------------------------------ */
.ar-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--ar-cyan-dim); border: 1px solid rgba(0,229,255,0.35);
  color: var(--ar-cyan); font-size: 10px; font-weight: 700; letter-spacing: 2.5px;
  text-transform: uppercase; padding: 5px 14px; border-radius: 30px;
  font-family: var(--ar-mono); margin-bottom: 12px;
  text-shadow: 0 0 12px rgba(0,229,255,0.6);
}
.ar-title {
  font-family: var(--ar-font); font-weight: 700;
  font-size: clamp(1.6rem, 5.5vw, 2.3rem); line-height: 1.08;
  margin: 0 0 8px; letter-spacing: -0.5px;
}
.ar-sub  { color: var(--ar-text2); font-size: 14.5px; margin: 0 0 14px; line-height: 1.5; max-width: 56ch; }
.ar-meta { font-family: var(--ar-mono); font-size: 10.5px; letter-spacing: 1.4px; text-transform: uppercase; color: var(--ar-muted); margin-bottom: 18px; }

/* ---------- HUD: score / streak / round dots ---------------------------- */
.ar-hud {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 16px; font-family: var(--ar-mono);
}
.ar-hud-stat {
  background: var(--ar-card); border: 1px solid var(--ar-border);
  border-radius: 12px; padding: 7px 13px; display: flex; align-items: baseline; gap: 7px;
  font-size: 11px; letter-spacing: 1px; text-transform: uppercase; color: var(--ar-muted);
}
.ar-hud-stat b { font-size: 19px; color: var(--ar-text); font-family: var(--ar-font); font-weight: 700; letter-spacing: 0; }
.ar-hud-stat.gold   { border-color: rgba(255,214,10,0.4);  background: var(--ar-gold-dim); }
.ar-hud-stat.gold b { color: var(--ar-gold); text-shadow: 0 0 14px rgba(255,214,10,0.5); }
.ar-hud-stat.hot    { border-color: rgba(255,46,136,0.45); background: var(--ar-pink-dim); }
.ar-hud-stat.hot b  { color: var(--ar-pink); text-shadow: 0 0 14px rgba(255,46,136,0.5); }
.ar-hud-stat .bump  { animation: arBump 0.35s cubic-bezier(0.2, 2.2, 0.4, 1); display: inline-block; }

.ar-dots { display: flex; gap: 6px; margin: 0 0 16px; }
.ar-dots span { height: 6px; flex: 1; border-radius: 3px; background: var(--ar-card2); transition: all 0.25s ease; }
.ar-dots span.done { background: var(--ar-mint); box-shadow: 0 0 10px rgba(0,255,163,0.55); }
.ar-dots span.now  { background: var(--ar-cyan); box-shadow: 0 0 10px rgba(0,229,255,0.55); animation: arBreathe 1.4s ease-in-out infinite; }
.ar-dots span.fail { background: var(--ar-pink); box-shadow: 0 0 8px rgba(255,46,136,0.45); }

/* ---------- timer bar ---------------------------------------------------- */
.ar-timer { height: 8px; border-radius: 4px; background: var(--ar-card2); overflow: hidden; margin-bottom: 16px; }
.ar-timer i {
  display: block; height: 100%; width: 100%; border-radius: 4px;
  background: var(--ar-mint); box-shadow: 0 0 12px rgba(0,255,163,0.6);
  transform-origin: left; transition: background 0.3s linear;
}
.ar-timer i.warn   { background: var(--ar-gold); box-shadow: 0 0 12px rgba(255,214,10,0.6); }
.ar-timer i.danger { background: var(--ar-pink); box-shadow: 0 0 12px rgba(255,46,136,0.7); }

/* ---------- cards & tiles ------------------------------------------------ */
.ar-card {
  background: var(--ar-grad-card); border: 1px solid var(--ar-border);
  border-radius: var(--ar-r-lg); padding: 22px 20px;
  box-shadow: 0 18px 50px rgba(0,0,0,0.45);
  margin-bottom: 16px; position: relative;
}
.ar-prompt { font-size: 18px; font-weight: 700; line-height: 1.35; margin: 0 0 16px; letter-spacing: -0.2px; }
.ar-label  { font-family: var(--ar-mono); font-size: 10px; letter-spacing: 2px; text-transform: uppercase; color: var(--ar-cyan); font-weight: 600; margin-bottom: 8px; }

.ar-tile {
  background: var(--ar-card); border: 2px solid var(--ar-border);
  border-radius: var(--ar-r); padding: 14px 16px; cursor: pointer;
  font-size: 15px; line-height: 1.45; color: var(--ar-text);
  font-family: var(--ar-font); text-align: left; width: 100%;
  transition: transform 0.12s ease, border-color 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
  position: relative;
}
.ar-tile:hover:not(:disabled)  { border-color: var(--ar-cyan); transform: translateY(-2px); box-shadow: 0 6px 22px rgba(0,229,255,0.16); }
.ar-tile:active:not(:disabled) { transform: scale(0.98); }
.ar-tile:focus-visible { outline: 2px solid var(--ar-cyan); outline-offset: 2px; }
.ar-tile.selected {
  border-color: var(--ar-cyan); background: var(--ar-cyan-dim);
  box-shadow: 0 0 0 3px rgba(0,229,255,0.18), 0 0 24px rgba(0,229,255,0.25);
}
.ar-tile.correct {
  border-color: var(--ar-mint); background: var(--ar-mint-dim);
  box-shadow: 0 0 0 3px rgba(0,255,163,0.18), 0 0 28px rgba(0,255,163,0.3);
  animation: arPop 0.4s cubic-bezier(0.2, 2.0, 0.4, 1);
}
.ar-tile.wrong {
  border-color: var(--ar-pink); background: var(--ar-pink-dim);
  box-shadow: 0 0 0 3px rgba(255,46,136,0.18), 0 0 28px rgba(255,46,136,0.3);
  animation: arShakeX 0.4s ease;
}
.ar-tile.dim { opacity: 0.42; }
.ar-tile:disabled { cursor: default; }

/* ---------- verdict pills ------------------------------------------------ */
.ar-pill {
  display: inline-block; font-family: var(--ar-mono); font-size: 10px; font-weight: 700;
  letter-spacing: 1.4px; text-transform: uppercase; padding: 3px 10px; border-radius: 20px;
}
.ar-pill.good { background: var(--ar-mint-dim); color: var(--ar-mint); border: 1px solid rgba(0,255,163,0.4); }
.ar-pill.bad  { background: var(--ar-pink-dim); color: var(--ar-pink); border: 1px solid rgba(255,46,136,0.4); }
.ar-pill.gold { background: var(--ar-gold-dim); color: var(--ar-gold); border: 1px solid rgba(255,214,10,0.4); }
.ar-pill.info { background: var(--ar-cyan-dim); color: var(--ar-cyan); border: 1px solid rgba(0,229,255,0.4); }

/* ---------- buttons ------------------------------------------------------ */
.ar-btn {
  background: var(--ar-grad); color: #051418; border: none;
  padding: 15px 26px; border-radius: 14px;
  font-family: var(--ar-font); font-size: 15px; font-weight: 700; letter-spacing: 0.3px;
  cursor: pointer; box-shadow: 0 6px 24px rgba(0,255,163,0.35);
  transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease;
}
.ar-btn:hover:not(:disabled)  { transform: translateY(-2px); box-shadow: 0 10px 32px rgba(0,255,163,0.45); }
.ar-btn:active:not(:disabled) { transform: scale(0.97); }
.ar-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.ar-btn:focus-visible { outline: 2px solid var(--ar-cyan); outline-offset: 3px; }
.ar-btn.hot   { background: var(--ar-grad-hot); box-shadow: 0 6px 24px rgba(255,46,136,0.4); color: #1c0510; }
.ar-btn.ghost { background: transparent; border: 2px solid var(--ar-border-hi); color: var(--ar-text); box-shadow: none; }
.ar-btn.ghost:hover:not(:disabled) { border-color: var(--ar-cyan); color: var(--ar-cyan); box-shadow: none; }
.ar-btn.big { width: 100%; padding: 18px; font-size: 17px; }

/* ---------- "Challenge your mates" — the share button ------------------ *
 * Designed to win the eye on the end screen so teens actually share. Pink
 * gradient (matches the "hot" tier), light shimmer wipe, breathing scale.
 * Pulsing stops on hover so it doesn't feel busy when they're about to tap. */
.ar-btn-share {
  background: var(--ar-grad-hot);
  color: #1c0510;
  box-shadow: 0 8px 28px rgba(255,46,136,0.5), 0 0 0 2px rgba(255,255,255,0.06) inset;
  position: relative; overflow: hidden;
  animation: arSharePulse 2.4s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}
.ar-btn-share::before {
  /* Diagonal shimmer wipes left → right every few seconds. */
  content: ''; position: absolute; top: 0; left: -100%;
  width: 70%; height: 100%;
  background: linear-gradient(110deg, transparent 30%, rgba(255,255,255,0.42) 50%, transparent 70%);
  animation: arShareShimmer 3.4s ease-in-out infinite;
  pointer-events: none;
}
.ar-btn-share:hover:not(:disabled) {
  animation: none;
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 14px 42px rgba(255,46,136,0.65);
}
.ar-btn-share:hover::before { animation-play-state: paused; }
.ar-btn-share:active:not(:disabled) { transform: scale(0.97); animation: none; }
@keyframes arSharePulse {
  0%, 100% { transform: translateY(0) scale(1); box-shadow: 0 8px 28px rgba(255,46,136,0.5), 0 0 0 2px rgba(255,255,255,0.06) inset; }
  50%      { transform: translateY(-2px) scale(1.03); box-shadow: 0 14px 36px rgba(255,46,136,0.7), 0 0 0 2px rgba(255,255,255,0.1) inset; }
}
@keyframes arShareShimmer {
  0%    { left: -100%; }
  60%   { left: 130%; }
  100%  { left: 130%; }
}
@media (prefers-reduced-motion: reduce) {
  .ar-btn-share { animation: none; }
  .ar-btn-share::before { display: none; }
}

/* ---------- feedback strip ----------------------------------------------- */
.ar-feedback { margin-top: 14px; padding: 13px 15px; border-radius: var(--ar-r); font-size: 14px; line-height: 1.55; animation: arSlideUp 0.3s ease; }
.ar-feedback.ok  { background: var(--ar-mint-dim); color: #b8ffe3; border: 1px solid rgba(0,255,163,0.35); }
.ar-feedback.no  { background: var(--ar-pink-dim); color: #ffc4dd; border: 1px solid rgba(255,46,136,0.35); }
.ar-feedback.mid { background: var(--ar-gold-dim); color: #ffeeb0; border: 1px solid rgba(255,214,10,0.3); }
.ar-feedback strong { color: var(--ar-text); }

.ar-kbd-hint { font-family: var(--ar-mono); font-size: 10px; letter-spacing: 1px; text-transform: uppercase; color: var(--ar-muted); margin-top: 12px; }
@media (hover: none) { .ar-kbd-hint { display: none; } }

/* ---------- end card (built to be screenshotted) ------------------------- */
.ar-end {
  margin-top: 20px; padding: 3px; border-radius: 24px;
  background: var(--ar-grad); animation: arSlideUp 0.45s cubic-bezier(0.2, 1.4, 0.4, 1);
}
.ar-end.hot { background: var(--ar-grad-hot); }
.ar-end-inner { background: var(--ar-bg2); border-radius: 21px; padding: 30px 22px 26px; text-align: center; position: relative; overflow: hidden; }
.ar-end-inner::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(ellipse 70% 45% at 50% 0%, rgba(0,255,163,0.12) 0%, transparent 65%);
}
.ar-end.hot .ar-end-inner::before { background: radial-gradient(ellipse 70% 45% at 50% 0%, rgba(255,46,136,0.14) 0%, transparent 65%); }
.ar-end h2 { font-family: var(--ar-font); font-weight: 700; font-size: 1.15rem; margin: 0 0 4px; letter-spacing: 1px; text-transform: uppercase; color: var(--ar-text2); }
.ar-end-topic { font-family: var(--ar-mono); font-size: 10.5px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--ar-muted); margin-bottom: 18px; }

.ar-grade {
  font-family: var(--ar-font); font-weight: 700; font-size: 92px; line-height: 1;
  margin: 6px 0 2px; animation: arGradeIn 0.6s cubic-bezier(0.2, 1.6, 0.3, 1) both 0.25s;
}
.ar-grade.s  { color: var(--ar-gold);  text-shadow: 0 0 40px rgba(255,214,10,0.7), 0 0 80px rgba(255,214,10,0.35); }
.ar-grade.a  { color: var(--ar-mint);  text-shadow: 0 0 40px rgba(0,255,163,0.65); }
.ar-grade.b  { color: var(--ar-cyan);  text-shadow: 0 0 40px rgba(0,229,255,0.6); }
.ar-grade.c  { color: var(--ar-violet); text-shadow: 0 0 40px rgba(139,92,246,0.6); }
.ar-grade.d  { color: var(--ar-pink);  text-shadow: 0 0 40px rgba(255,46,136,0.55); }
.ar-grade-line { font-size: 14px; color: var(--ar-text2); margin-bottom: 16px; }

.ar-end-big { font-family: var(--ar-font); font-weight: 700; font-size: 44px; line-height: 1; color: var(--ar-text); }
.ar-end-lbl { font-family: var(--ar-mono); font-size: 10px; letter-spacing: 1.6px; text-transform: uppercase; color: var(--ar-muted); margin: 6px 0 14px; }

.ar-end-rows { display: flex; justify-content: center; gap: 10px; flex-wrap: wrap; margin: 12px 0 4px; }
.ar-end-row  { background: var(--ar-card); border: 1px solid var(--ar-border); border-radius: 12px; padding: 9px 14px; min-width: 86px; }
.ar-end-row b { display: block; font-size: 20px; font-weight: 700; color: var(--ar-text); }
.ar-end-row span { font-family: var(--ar-mono); font-size: 9.5px; letter-spacing: 1.2px; text-transform: uppercase; color: var(--ar-muted); }

.ar-emoji-grid { font-size: 22px; letter-spacing: 3px; margin: 12px 0 2px; line-height: 1.5; word-break: break-all; }

.ar-best { display: inline-block; margin-top: 10px; font-family: var(--ar-mono); font-size: 10.5px; letter-spacing: 1.4px; text-transform: uppercase; color: var(--ar-gold); background: var(--ar-gold-dim); border: 1px solid rgba(255,214,10,0.4); border-radius: 20px; padding: 5px 14px; animation: arBreathe 1.6s ease-in-out infinite; }
.ar-best.old { animation: none; opacity: 0.65; color: var(--ar-text2); background: var(--ar-card); border-color: var(--ar-border); }

.ar-insight { font-size: 13.5px; color: var(--ar-text2); margin: 16px auto 0; padding: 13px 15px; background: var(--ar-card); border-radius: var(--ar-r); border-left: 3px solid var(--ar-cyan); text-align: left; max-width: 54ch; line-height: 1.55; }

.ar-ctas { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 20px; position: relative; z-index: 1; }
.ar-ctas a.ar-btn { text-decoration: none; display: inline-block; }
.ar-watermark { margin-top: 16px; font-family: var(--ar-mono); font-size: 10px; letter-spacing: 2px; text-transform: uppercase; color: var(--ar-muted); }

/* ---------- leaderboard (end card + hub) --------------------------------- */
.ar-lb { margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--ar-border-hi); position: relative; z-index: 1; }
.ar-lb-title { font-family: var(--ar-mono); font-size: 12px; font-weight: 700; letter-spacing: 2px; color: var(--ar-gold); text-shadow: 0 0 12px rgba(255,214,10,0.5); }
.ar-lb-sub { font-family: var(--ar-mono); font-size: 10px; letter-spacing: 1.2px; text-transform: uppercase; color: var(--ar-muted); margin: 4px 0 12px; }
.ar-lb-picker { display: flex; gap: 10px; justify-content: center; align-items: center; flex-wrap: wrap; }
.ar-lb-slot { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.ar-lb-letter {
  width: 46px; height: 52px; display: flex; align-items: center; justify-content: center;
  font-family: var(--ar-font); font-size: 28px; font-weight: 700; color: var(--ar-cyan);
  background: var(--ar-card); border: 2px solid rgba(0,229,255,0.45); border-radius: 10px;
  text-shadow: 0 0 14px rgba(0,229,255,0.6);
}
.ar-lb-arrow {
  background: none; border: none; color: var(--ar-muted); font-size: 13px; cursor: pointer;
  padding: 3px 12px; transition: color 0.1s ease, transform 0.1s ease;
}
.ar-lb-arrow:hover { color: var(--ar-cyan); transform: scale(1.2); }
.ar-lb-go { padding: 12px 18px; font-size: 13px; margin-left: 6px; }
.ar-lb-result { font-family: var(--ar-mono); font-size: 14px; font-weight: 700; letter-spacing: 2px; color: var(--ar-gold); text-shadow: 0 0 14px rgba(255,214,10,0.6); padding: 10px 0; animation: arPop 0.4s cubic-bezier(0.2, 2.0, 0.4, 1); }
.ar-lb-board { margin-top: 12px; }
.ar-lb-list { list-style: none; margin: 0; padding: 0; text-align: left; max-width: 380px; margin: 0 auto; }
.ar-lb-list li {
  display: flex; align-items: baseline; gap: 8px; padding: 6px 10px; border-radius: 8px;
  font-family: var(--ar-mono); font-size: 12.5px; color: var(--ar-text2);
}
.ar-lb-list li:nth-child(odd) { background: rgba(255,255,255,0.03); }
.ar-lb-list li.you { background: var(--ar-gold-dim); border: 1px solid rgba(255,214,10,0.4); color: var(--ar-text); }
.ar-lb-list li.you::after { content: 'YOU'; font-size: 8px; letter-spacing: 1.5px; color: var(--ar-gold); margin-left: 4px; }
.ar-lb-rank { flex: 0 0 34px; color: var(--ar-muted); }
.ar-lb-list li:first-child .ar-lb-rank { color: var(--ar-gold); }
.ar-lb-name { font-weight: 700; letter-spacing: 2px; color: var(--ar-text); flex: 0 0 auto; }
.ar-lb-meta { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 10.5px; color: var(--ar-muted); }
.ar-lb-score { font-weight: 700; color: var(--ar-cyan); }
.ar-lb-empty { font-family: var(--ar-mono); font-size: 11px; letter-spacing: 1px; color: var(--ar-muted); padding: 10px 0; }

/* ---------- floating fx / overlays --------------------------------------- */
.ar-float {
  position: fixed; pointer-events: none; z-index: 999;
  font-family: var(--ar-font); font-weight: 700; font-size: 24px;
  animation: arFloatUp 0.9s ease-out forwards; text-shadow: 0 2px 14px rgba(0,0,0,0.6);
}
.ar-flash-msg {
  position: fixed; left: 50%; top: 38%; transform: translate(-50%, -50%);
  z-index: 998; pointer-events: none;
  font-family: var(--ar-font); font-weight: 700; font-size: clamp(34px, 9vw, 58px);
  letter-spacing: 1px; animation: arFlashMsg 0.85s cubic-bezier(0.2, 1.6, 0.3, 1) forwards;
  text-shadow: 0 0 30px currentColor;
}
#ar-confetti { position: fixed; inset: 0; pointer-events: none; z-index: 997; }
body.ar-shake { animation: arShakeBody 0.35s ease; }

.ar-mute {
  position: fixed; right: 14px; bottom: 14px; z-index: 1000;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--ar-card); border: 1px solid var(--ar-border-hi);
  color: var(--ar-text); font-size: 18px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.ar-mute:hover { transform: scale(1.08); border-color: var(--ar-cyan); }

/* ---------- error / fallback --------------------------------------------- */
.ar-error { padding: 20px; background: var(--ar-pink-dim); border: 1px solid rgba(255,46,136,0.3); border-radius: var(--ar-r); color: #ffc4dd; font-size: 14px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ---------- keyframes ----------------------------------------------------- */
@keyframes arPop      { 0% { transform: scale(1); } 45% { transform: scale(1.05); } 100% { transform: scale(1); } }
@keyframes arBump     { 0% { transform: scale(1); } 40% { transform: scale(1.45); } 100% { transform: scale(1); } }
@keyframes arBreathe  { 0%, 100% { opacity: 1; } 50% { opacity: 0.55; } }
@keyframes arShakeX   { 0%, 100% { transform: translateX(0); } 20% { transform: translateX(-7px); } 40% { transform: translateX(6px); } 60% { transform: translateX(-4px); } 80% { transform: translateX(3px); } }
@keyframes arShakeBody{ 0%, 100% { transform: translate(0,0); } 25% { transform: translate(-6px, 2px); } 50% { transform: translate(5px, -2px); } 75% { transform: translate(-3px, 1px); } }
@keyframes arSlideUp  { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
@keyframes arFlipIn   { from { opacity: 0; transform: rotateX(70deg); } to { opacity: 1; transform: rotateX(0); } }
@keyframes arFloatUp  { from { opacity: 1; transform: translateY(0) scale(1); } to { opacity: 0; transform: translateY(-70px) scale(1.25); } }
@keyframes arFlashMsg { 0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); } 18% { opacity: 1; transform: translate(-50%, -50%) scale(1.08); } 30% { transform: translate(-50%, -50%) scale(1); } 75% { opacity: 1; } 100% { opacity: 0; transform: translate(-50%, -58%) scale(1.02); } }
@keyframes arGradeIn  { from { opacity: 0; transform: scale(2.4) rotate(-6deg); } to { opacity: 1; transform: scale(1) rotate(0); } }

/* staggered tile entrance */
.ar-stagger > * { animation: arSlideUp 0.35s ease both; }
.ar-stagger > *:nth-child(1) { animation-delay: 0.02s; }
.ar-stagger > *:nth-child(2) { animation-delay: 0.07s; }
.ar-stagger > *:nth-child(3) { animation-delay: 0.12s; }
.ar-stagger > *:nth-child(4) { animation-delay: 0.17s; }
.ar-stagger > *:nth-child(5) { animation-delay: 0.22s; }
.ar-stagger > *:nth-child(6) { animation-delay: 0.27s; }
.ar-stagger > *:nth-child(7) { animation-delay: 0.32s; }
.ar-stagger > *:nth-child(8) { animation-delay: 0.37s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001s !important; animation-iteration-count: 1 !important; transition-duration: 0.001s !important; }
}
@media (max-width: 480px) {
  .ar-wrap { padding-left: 0.85rem; padding-right: 0.85rem; }
  .ar-card { padding: 18px 14px; }
  .ar-grade { font-size: 76px; }
}