:root{
  /* Study64 brand system. --accent is a slightly deepened version of the
     brand violet (#7C5CFF) chosen so white button text clears WCAG AA
     (4.5:1) — the raw brand violet only reaches ~4.35:1 with white text.
     --accent-bright is the true, undeepened brand violet for decorative/
     non-text use (icons, borders, small accents) where AA text rules don't
     apply. Green is reserved ONLY for the semantic "correct / I know this"
     meaning — see --good below. */
  --accent:#7550F2; --accent-bright:#7C5CFF; --accent-press:#6A43E4;
  --accent-soft:#EFEAFF; --accent-line:#D9CFFA;
  --ring:rgba(117,80,242,.28);
  --bg:#F8F6EE; --card:#FFFEFC; --edge:#E4DFD1; --edge2:#D2CBB8;
  --text:#0D1218; --muted:#655D50;
  --good:#2e8b57; --good-soft:#e5f4e9; --good-line:#c3e4cf;
  --bad:#b84545; --bad-soft:#f9e8e8; --bad-line:#efc6c6;
  /* Supporting hues — one per activity/category, always paired with soft bg
     + line, each deepened enough to stay readable as text (the raw brand
     hex for cobalt/coral fails AA as body text — see the report). Violet
     stays the strongest, most frequent brand accent; these exist so the S's
     other brand colors (cobalt, teal, gold, coral) show up selectively
     across categories instead of everything being violet. */
  --sun:#B4860A; --sun-soft:#FCF1D3; --sun-line:#EED89A;         /* gold — Match Up, highlights/rewards */
  --teal:#0E8577; --teal-soft:#DFF5F1; --teal-line:#B9E4DB;      /* teal — tests, Lightning Round */
  --sky:#2563C7; --sky-soft:#E4EEFE; --sky-line:#BFD7FB;         /* cobalt — Star Defender */
  --coral:#D6392C; --coral-soft:#FDE7E4; --coral-line:#F5C1BA;   /* coral — rapid fire, Trivia Duel */
  --flame:#C2570F; --flame-soft:#FBEADA; --flame-line:#EFCBA0;   /* ember — study streak */
  --radius:16px; --radius-sm:12px; --radius-pill:999px;
  --shadow-sm:0 1px 2px rgba(13,18,24,.05);
  --shadow:0 8px 24px -18px rgba(13,18,24,.15);
  --shadow-lg:0 18px 42px -24px rgba(13,18,24,.22);
}
*{margin:0;padding:0;box-sizing:border-box}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{color:var(--text);font-family:'IBM Plex Sans',system-ui,sans-serif;
  min-height:100vh;line-height:1.55;-webkit-font-smoothing:antialiased;
  background:var(--bg);
  background-attachment:fixed}
/* Study64's chunky, geometric display face for major marketing headings —
   body copy and application UI stay on the highly-readable IBM Plex Sans
   below; this is scoped to headings/brand text only. */
h1,h2,h3,.logo{font-family:'Archivo Black','IBM Plex Sans',sans-serif;letter-spacing:-.01em}
button{font-family:inherit}
button:focus-visible,[role=button]:focus-visible{outline:3px solid var(--ring);outline-offset:2px}

/* line-style SVG icons, sized by font-size, inherit text color */
.icon{width:1em;height:1em;stroke:currentColor;fill:none;stroke-width:2;
  stroke-linecap:round;stroke-linejoin:round;flex:0 0 auto;vertical-align:-.14em}
.icon-lg{width:26px;height:26px}
.iconBtn{display:inline-flex;align-items:center;justify-content:center;gap:8px}

/* ---------- shared buttons ---------- */
.btn{display:inline-block;border:none;border-radius:var(--radius-sm);padding:12px 20px;
  font-size:15px;font-weight:600;cursor:pointer;transition:background .18s, filter .18s, transform .06s}
.btn:active{transform:scale(.985)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring)}
.btnPrimary{background:var(--accent);color:#fff;width:100%}
.btnPrimary:hover:not(:disabled){background:var(--accent-press)}
.btnGhost{background:transparent;border:1.5px solid var(--edge2);color:var(--text)}
.btnGhost:hover{border-color:var(--accent);color:var(--accent)}
.btnGood{background:var(--good);color:#fff}
.btnGood:hover:not(:disabled){filter:brightness(1.06)}
.btnBad{background:var(--bad-soft);color:var(--bad)}
.btnBad:hover:not(:disabled){filter:brightness(.98)}
.btnAccentSoft{background:var(--accent-soft);color:var(--accent);white-space:nowrap}
.btnAccentSoft:hover:not(:disabled){background:var(--accent-line)}
.btnSmall{padding:8px 14px;font-size:13px}
.fine{color:var(--muted);font-size:12.5px;text-align:center;margin-top:14px}

/* ---------- auth page ---------- */
.authWrap{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.authCard{width:min(430px,100%);background:var(--card);border:1px solid var(--edge);
  border-radius:20px;box-shadow:var(--shadow-sm);padding:34px 30px}
.logo{display:inline-flex;align-items:center;gap:9px;font-size:24px;font-weight:700}
.authCard .logo{display:flex;justify-content:center;text-decoration:none}
.logo .icon{width:26px;height:26px;color:var(--accent)}
.logo span{color:var(--accent)}
.authHeader{display:flex;flex-direction:column;align-items:center;gap:8px;margin-bottom:18px}
.authHeaderSub{font-size:13px;font-weight:500;color:var(--muted);text-align:center;line-height:1.45}
.tagline{color:var(--muted);text-align:center;font-size:14.5px;margin:12px 0 24px;line-height:1.5}
.authTabs{display:grid;grid-template-columns:1fr 1fr;gap:8px;background:transparent;margin-bottom:22px}
.authTab{min-height:52px;border:1.5px solid var(--edge2);background:var(--card);border-radius:10px;padding:7px 12px;
  font-size:14px;font-weight:600;color:var(--muted);cursor:pointer;transition:background .18s,border-color .18s,color .18s}
.authTab:hover{border-color:var(--accent);color:var(--accent)}
.authTab.active{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:none}
label{display:block;font-size:13px;font-weight:600;color:var(--muted);margin:14px 0 5px}
input[type=email],input[type=password],input[type=text],textarea,select{
  width:100%;background:var(--card);border:1.5px solid var(--edge2);border-radius:var(--radius-sm);
  padding:12px 14px;font-size:15px;font-family:inherit;color:var(--text);outline:none;
  transition:border .18s, box-shadow .18s}
input:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--ring)}
/* Placeholder hint text follows the theme instead of the browser's default gray */
input::placeholder,textarea::placeholder{color:var(--muted);opacity:.75}
#authForm .btn{margin-top:20px}
.authMsg{margin-top:14px;font-size:13.5px;font-weight:500;text-align:center;min-height:1em}
.authMsg.err{color:var(--bad)} .authMsg.ok{color:var(--good)}
.resendWrap{margin-top:2px;text-align:center}
.resendWrap .linkBtn{display:inline-block;margin:0 auto}
.resendWrap .linkBtn:disabled{color:var(--muted);cursor:default;text-decoration:none}
.resendWrap #resendStatus{margin-top:6px;font-size:12.5px}
.featList{list-style:none;margin-top:24px;border-top:1px solid var(--edge);padding-top:18px}
.featList li{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;color:var(--muted);padding:6px 0}
.featList li .icon{width:17px;height:17px;color:var(--accent);margin-top:2px}

/* ---------- app shell ---------- */
header.appBar{position:sticky;top:0;z-index:30;background:rgba(255,253,250,.96);
  border-bottom:1px solid var(--edge);
  display:flex;align-items:center;gap:14px;padding:13px 22px}
header.appBar .logo{font-size:19px;cursor:pointer}
#usagePill{margin-left:auto;font-size:12.5px;font-weight:600;color:var(--muted);
  background:var(--bg);border:1px solid var(--edge);border-radius:var(--radius-pill);
  padding:6px 14px;white-space:nowrap}
#usagePill.pro{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent)}
#signOutBtn{border:none;background:none;color:var(--muted);font-size:13px;font-weight:600;
  cursor:pointer;padding:6px}
#signOutBtn:hover{color:var(--bad)}
#mobileMenuBtn,.mobileMenuOverlay{display:none}
.shell{max-width:880px;margin:0 auto;padding:28px 18px 80px}
.view{display:none}
.view.active{display:block;animation:fadeUp .32s ease}
@keyframes fadeUp{from{opacity:0;transform:translateY(8px)}}
h2.viewTitle{font-size:25px;line-height:1.25;font-weight:700;margin-bottom:5px}
.viewSub{color:var(--muted);font-size:14px;font-weight:500;margin-bottom:24px}
.backLink{display:inline-flex;align-items:center;gap:6px;border:none;background:none;
  color:var(--muted);font-size:13.5px;font-weight:600;cursor:pointer;margin-bottom:16px;padding:0}
.backLink .icon{width:16px;height:16px}
.backLink:hover{color:var(--accent)}

/* ---------- main nav (Library / Games) ---------- */
#mainNav{display:flex;gap:4px;background:var(--card);border:1px solid var(--edge);
  border-radius:14px;padding:5px;width:max-content;margin-bottom:24px;box-shadow:var(--shadow-sm)}
.navTab{display:inline-flex;align-items:center;gap:8px;border:none;background:transparent;
  border-radius:11px;padding:9px 16px;font-size:14px;font-weight:600;
  color:var(--muted);cursor:pointer;transition:background .18s,color .18s,transform .06s}
.navTab .icon{width:16px;height:16px}
.navTab:hover{color:var(--text);background:rgba(107,104,128,.06)}
.navTab.active{background:var(--card);color:var(--accent);box-shadow:var(--shadow-sm)}
.navTab.active:hover{background:var(--card);color:var(--accent)}
.navTab:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring)}

/* ---------- Star Defender (retro arcade — intentionally distinct) ---------- */
.arcadePanel{position:relative;background:#0b0b16;border:1px solid #23233a;
  border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);overflow:hidden}
#starQuestion{color:#f4f4ff;font-size:clamp(17px,4.4vw,21px);font-weight:700;text-align:center;
  margin-bottom:12px;line-height:1.4;min-height:2.8em;display:flex;align-items:center;
  justify-content:center;max-width:480px;margin-left:auto;margin-right:auto}
.sdHud{display:flex;justify-content:space-between;align-items:center;gap:10px;
  font-family:'Press Start 2P',monospace;font-size:10px;color:#7ef9ff;margin-bottom:12px}
.sdHud .lives{color:#ff5c7a}
#sdStreak{color:#ffd24a;display:inline-block;transition:transform .18s ease,text-shadow .18s ease}
#sdStreak.sdPulse{transform:scale(1.35);text-shadow:0 0 8px rgba(255,210,74,.85)}
#starCanvas{width:100%;max-width:480px;display:block;margin:0 auto;border-radius:10px;
  background:#05050d;touch-action:none}
.sdTouch{display:flex;gap:12px;justify-content:center;margin-top:14px}
.sdTouch button{min-width:74px;height:52px;border:1.5px solid #2c2c48;background:#121222;
  color:#7ef9ff;border-radius:12px;cursor:pointer;font-family:'Press Start 2P',monospace;
  font-size:10px;display:inline-flex;align-items:center;justify-content:center;
  user-select:none;-webkit-user-select:none;touch-action:none}
.sdTouch button .icon{width:20px;height:20px}
.sdTouch button:active{background:#1c1c36}
#sdFire{min-width:110px;color:#ff5c7a;border-color:#3a2333}
.sdHint{color:#5d5d80;font-size:12px;text-align:center;margin-top:10px}
.sdOverlay{position:absolute;inset:0;background:rgba(6,6,15,.96);display:flex;
  flex-direction:column;align-items:center;justify-content:center;gap:14px;
  padding:26px;text-align:center;overflow:auto;z-index:5}
.sdOverlay.sdIn{animation:sdOverlayIn .32s ease-out}
@keyframes sdOverlayIn{from{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}
.sdOverTitle{font-family:'Press Start 2P',monospace;font-size:20px;color:#ff5c7a;letter-spacing:.05em}
.sdFinal{font-family:'Press Start 2P',monospace;font-size:13px;color:#7ef9ff;line-height:2}
.sdFinal .sdStatLine{display:block}
.sdHighNote{font-family:'Press Start 2P',monospace;font-size:11px;letter-spacing:.04em}
.sdHighNote.isNew{color:#ffd24a}
.sdHighNote.isOld{color:#5d5d80}
.sdMissWrap{width:100%;max-width:400px;max-height:220px;overflow:auto;text-align:left}
.sdMissTitle{font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:#5d5d80;margin-bottom:8px}
.sdMissRow{background:#121222;border:1px solid #23233a;border-radius:10px;padding:10px 13px;
  margin-bottom:8px;font-size:13px;color:#c9c9e8;line-height:1.5}
.sdMissRow b{color:#7ef9ff;display:block}
.sdOverBtns{display:flex;flex-direction:column;gap:10px;width:100%;max-width:280px}
.sdOverlay .btnGhost{border-color:#2c2c48;color:#c9c9e8}
.sdOverlay .btnGhost:hover{border-color:#7ef9ff;color:#7ef9ff}
.sdPerfect{color:#5fe8a8;font-size:13.5px;font-weight:600}

/* ---------- Pong (answer-selection arcade game) ---------- */
.pongPanel{max-width:800px;margin:0 auto;text-align:center}
#pongQuestion{min-height:50px;display:flex;align-items:center;justify-content:center;
  color:var(--text);font-size:18px;font-weight:700;line-height:1.4;padding:0 12px 7px}
.pongHud{display:grid;grid-template-columns:repeat(5,1fr);align-items:center;gap:8px;
  padding:12px 14px;border:2px solid #27443d;border-bottom:0;background:#07110f;color:#72e1bd;
  font-family:'Press Start 2P',monospace;font-size:9px;line-height:1.5}
.pongHud span:nth-child(2){color:#ffcf4a}
.pongHud span:nth-child(3){color:#ff6978}
.pongHud span:nth-child(4){color:#f5f7f6}
.pongStage{position:relative;overflow:hidden;border:2px solid #27443d;background:#06100e;
  box-shadow:0 0 0 2px #020706}
#pongCanvas{display:block;width:100%;height:auto;aspect-ratio:8/5;background:#06100e;
  image-rendering:pixelated;image-rendering:crisp-edges;touch-action:none}
.pongStage.pongShake{animation:pongShake .24s steps(2,end)}
@keyframes pongShake{0%,100%{transform:translate(0)}33%{transform:translate(-5px,2px)}66%{transform:translate(5px,-2px)}}
.pongOverlay{position:absolute;inset:0;z-index:3;display:flex;flex-direction:column;
  align-items:center;justify-content:center;gap:14px;padding:26px;background:rgba(3,9,8,.94);color:#f5f7f6}
.pongOverlay[hidden]{display:none}
.pongOverlay h3{font-family:'Press Start 2P',monospace;font-size:19px;color:#ff6978;line-height:1.45}
.pongOverlay p{max-width:560px;color:#d4e0dc;font-size:15px;line-height:1.6}
.pongOverlayBtns{display:flex;flex-wrap:wrap;justify-content:center;gap:10px}
.pongOverlayBtns .btn{width:auto;margin:0}
.pongOverlay .btnGhost{border-color:#527269;color:#d4e0dc}
.pongTouch{display:none;justify-content:center;gap:12px;margin-top:13px;touch-action:none}
.pongTouch button{min-width:120px;height:52px;border:2px solid #315c50;border-radius:11px;
  background:#0c1c18;color:#72e1bd;font-family:'Press Start 2P',monospace;font-size:10px;
  font-weight:700;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:none}
.pongTouch button:active{background:#173b32;transform:translateY(2px)}
.pongHint{margin-top:10px;color:var(--muted);font-size:12px}
@media(max-width:700px),(pointer:coarse){.pongTouch{display:flex}.pongHint{display:none}}
@media(max-width:520px){
  #pongQuestion{font-size:16px;min-height:46px;padding-left:4px;padding-right:4px}
  .pongHud{grid-template-columns:1fr 1fr;padding:9px 8px;font-size:8px;gap:5px}
  .pongTouch button{min-width:105px;height:50px}
  .pongOverlay{padding:18px}.pongOverlay h3{font-size:16px}
  .pongOverlayBtns{width:100%}.pongOverlayBtns .btn{flex:1;min-width:130px}
}

/* ---------- Trivia Duel (solo) ---------- */
#tdTop{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;
  font-family:'IBM Plex Sans',sans-serif;font-weight:600;font-size:14px}
#tdTop span{display:inline-flex;align-items:center;gap:6px}
#tdTop .icon{width:17px;height:17px}
#tdStreak{color:var(--accent)}
#tdCount{color:var(--muted);font-size:13px}
.tdTyped input{margin-bottom:12px}

/* ---------- Brain Trivia (1v1 elimination battle — dark arcade, matches Star Defender/Pong) ---------- */
.btPanel{max-width:620px;margin:0 auto;position:relative;background:#0b0b16;border:1px solid #23233a;
  border-radius:16px;padding:26px 22px;color:#f2f2fb}
.btScreen{display:none}
.btScreen.active{display:block}
.btTitle{font-family:'Press Start 2P',monospace;font-size:16px;color:#7ef9ff;text-align:center;margin:4px 0 8px}
.btSub{text-align:center;color:#c9c9e8;font-size:13.5px;margin:0 0 22px}
.btLobbyBtns{display:flex;flex-direction:column;align-items:center;gap:16px}
.btLobbyBtns[hidden]{display:none}
.btJoinRow{display:flex;gap:8px;width:100%;max-width:320px}
.btJoinRow input{flex:1;min-width:0;text-transform:uppercase;letter-spacing:.08em;text-align:center;
  background:#14142a;border:1.5px solid #2c2c48;color:#f2f2fb;border-radius:10px;padding:11px 10px;font-size:14px}
.btJoinRow input:focus{outline:none;border-color:#7ef9ff}
.btJoinRow .btn{width:auto;flex:0 0 auto}
.btLobbyErr{color:#ff5c7a;text-align:center;font-size:13px;min-height:18px;margin-top:14px}
.btVs{display:flex;align-items:center;justify-content:center;gap:22px;margin:18px 0 20px}
.btVsCompact{gap:14px;margin:6px 0 10px}
.btAvatarWrap{display:flex;flex-direction:column;align-items:center;gap:8px;font-size:12px;color:#c9c9e8;
  max-width:110px;text-align:center;overflow-wrap:anywhere}
.btAvatar{width:64px;height:64px;border-radius:50%;background:#181832;border:2px solid #2c2c48;
  display:flex;align-items:center;justify-content:center;font-family:'Press Start 2P',monospace;
  font-size:20px;color:#7ef9ff;transition:border-color .15s,box-shadow .15s,transform .15s}
.btVsCompact .btAvatar{width:48px;height:48px;font-size:15px}
.btAvatarPending{opacity:.45}
.btAvatar.btTurnActive{border-color:#7ef9ff;box-shadow:0 0 0 3px rgba(126,249,255,.25);transform:scale(1.06)}
.btAvatar.btGood{border-color:#4ade80;box-shadow:0 0 0 3px rgba(74,222,128,.3)}
.btAvatar.btBad{animation:btShake .3s steps(2,end)}
.btAvatar.btOut{border-color:#ff5c7a;color:#ff5c7a;opacity:.35;transform:scale(.85);filter:blur(.5px)}
@keyframes btShake{0%,100%{transform:translate(0)}33%{transform:translate(-4px,2px)}66%{transform:translate(4px,-2px)}}
.btVsLabel{font-family:'Press Start 2P',monospace;font-size:12px;color:#ff5c7a}
.btRoomBox{display:flex;flex-direction:column;align-items:center;gap:4px;background:#14142a;
  border:1.5px dashed #2c2c48;border-radius:12px;padding:14px;margin:0 auto 14px;max-width:220px}
.btRoomBox span{font-size:11px;color:#8f8fb8;text-transform:uppercase;letter-spacing:.08em}
.btRoomBox b{font-family:'Press Start 2P',monospace;font-size:22px;letter-spacing:.12em;color:#7ef9ff}
.btWaitStatus{text-align:center;color:#c9c9e8;font-size:13.5px}
.btCountdownNum{font-family:'Press Start 2P',monospace;font-size:64px;color:#7ef9ff;text-align:center;
  padding:60px 0;animation:btPulse .5s ease}
@keyframes btPulse{0%{transform:scale(.6);opacity:0}60%{transform:scale(1.12)}100%{transform:scale(1);opacity:1}}
.btTurnLabel{text-align:center;font-family:'Press Start 2P',monospace;font-size:13px;color:#7ef9ff;margin-bottom:10px}
.btTurnLabel.btOppTurn{color:#c9c9e8}
.btTimerBar{background:#181832}
.btTimerBar i{background:#7ef9ff}
.btTimerBar i.low{background:#ff5c7a}
.btArena{background:#14142a;border:1px solid #2c2c48;border-radius:12px;padding:22px;text-align:center}
.btArena .btQ{font-size:16px;font-weight:600;line-height:1.45;margin-bottom:16px}
.btArena input{width:100%;text-align:center;background:#0b0b16;border:1.5px solid #2c2c48;
  color:#f2f2fb;border-radius:10px;padding:12px 10px;font-size:15px;margin-bottom:12px}
.btArena input:focus{outline:none;border-color:#7ef9ff}
.btArena input:disabled{opacity:.5}
.btWaitingMsg{color:#8f8fb8;font-style:italic;padding:12px 0 4px}
.btOppAnswerLabel{font-size:10.5px;letter-spacing:.04em;text-transform:uppercase;color:#8f8fb8;margin-top:4px}
.btOppAnswer{min-height:1.4em;background:#0b0b16;border:1.5px dashed #2c2c48;border-radius:10px;
  padding:10px 12px;margin:6px 0 4px;font-size:15px;color:#c9e9ff;word-break:break-word}
.btFeedback{margin-top:14px;font-size:14px;padding:12px 14px;border-radius:10px;display:none}
.btFeedback.show{display:block}
.btFeedback.btGoodFb{background:rgba(74,222,128,.12);border:1px solid rgba(74,222,128,.35);color:#a7f3c6}
.btFeedback.btBadFb{background:rgba(255,92,122,.14);border:1px solid rgba(255,92,122,.4);color:#ffc2cf}
#viewGameBrainTrivia .resultBox{background:#0b0b16;border-color:#2c2c48;color:#f2f2fb}
#viewGameBrainTrivia .resultBox h3{font-family:'Press Start 2P',monospace;font-size:18px;color:#7ef9ff}
#viewGameBrainTrivia .resultBox p{color:#c9c9e8}
#viewGameBrainTrivia .btnGhost{border-color:#2c2c48;color:#c9c9e8}
#viewGameBrainTrivia .btnGhost:hover{border-color:#7ef9ff;color:#7ef9ff}
#viewGameBrainTrivia .linkBtn{color:#c9c9e8}
#viewGameBrainTrivia .linkBtn:hover{color:#7ef9ff}
#gameBrainCard .ic{background:#e7f2ff;color:#3f6fd4}
#gameBrainCard:hover{border-color:#a9c4ef}

/* ---------- Brain Trivia battle characters (Step 2) ---------- */
.btBattleRow{display:flex;align-items:flex-end;justify-content:space-between;gap:10px}
.btCharSlot{flex:0 0 auto;width:84px;display:flex;flex-direction:column;align-items:center;gap:6px}
.btCharLabel{font-size:10.5px;letter-spacing:.04em;text-transform:uppercase;color:#8f8fb8}
.btChar{position:relative;width:68px;height:82px;transition:transform .45s cubic-bezier(.34,1.56,.64,1),opacity .3s,filter .3s;
  opacity:.68;filter:saturate(.55) brightness(.8);transform:translateX(0) scale(.9)}
.btCharSlotA.btForward .btChar{transform:translateX(20px) scale(1.08)}
.btCharSlotB.btForward .btChar{transform:translateX(-20px) scale(1.08)}
.btForward .btChar{opacity:1;filter:none}
.btCharBob{width:100%;height:100%;animation:btBob 2.2s ease-in-out infinite}
.btForward .btCharBob{animation:btBobActive 1s ease-in-out infinite}
@keyframes btBob{0%,100%{transform:translateY(0)}50%{transform:translateY(-3px)}}
@keyframes btBobActive{0%,100%{transform:translateY(0) rotate(0)}50%{transform:translateY(-6px) rotate(-2deg)}}
.btChar.btCorrect .btCharBob{animation:btCorrectPop .55s ease}
@keyframes btCorrectPop{0%{transform:translateY(0) scale(1)}30%{transform:translateY(-14px) scale(1.14)}
  60%{transform:translateY(2px) scale(.96)}100%{transform:translateY(0) scale(1)}}
.btChar.btOutFx .btCharBob{animation:btEliminate .75s cubic-bezier(.36,.07,.19,.97) forwards}
@keyframes btEliminate{
  0%{transform:translate(0,0) rotate(0) scale(1);opacity:1}
  10%{transform:translate(-14px,-4px) rotate(-16deg) scale(1.12);opacity:1}
  22%{transform:translate(16px,-2px) rotate(14deg) scale(1.1);opacity:1}
  34%{transform:translate(-10px,2px) rotate(-10deg) scale(1.05);opacity:1}
  46%{transform:translate(6px,-10px) rotate(8deg) scale(1.25);opacity:.9}
  60%{transform:translate(-4px,6px) rotate(-6deg) scale(.7);opacity:.5}
  80%{transform:translate(2px,18px) rotate(10deg) scale(.35);opacity:.15}
  100%{transform:translate(0,26px) rotate(14deg) scale(0);opacity:0}}
.btChar.btOut{opacity:.28;filter:grayscale(1) brightness(.55)}
.btChar.btOut .btCharBob{animation:none;transform:translate(0,26px) rotate(14deg) scale(0)}
.btChar.btWin{opacity:1;filter:drop-shadow(0 0 10px #7ef9ff)}
.btChar.btWin .btCharBob{animation:btVictoryPulse .6s ease-in-out 3}
@keyframes btVictoryPulse{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-10px) scale(1.1)}}

/* ---------- Brain Trivia arcade elimination explosion ---------- */
/* Bright instant hit-flash the moment a wrong answer/timeout resolves —
   plays before the explosion so the impact reads immediately. Scales the
   whole character up sharply so the hit actually reads as a HIT. */
.btChar.btImpactFlash{filter:brightness(3.2) saturate(0) drop-shadow(0 0 18px #fff)}
.btChar.btImpactFlash .btCharBob{animation:btImpactPunch .15s ease-out}
@keyframes btImpactPunch{0%{transform:scale(1)}50%{transform:scale(1.35)}100%{transform:scale(1.1)}}
/* The surviving player's character gets a strong anticipatory reaction at
   the same moment, not just the .btWin glow later at match end. */
.btChar.btWinAnticipate .btCharBob{animation:btWinAnticipatePulse .28s ease 3}
@keyframes btWinAnticipatePulse{0%,100%{transform:translateY(0) scale(1)}50%{transform:translateY(-10px) scale(1.22)}}
/* A big, punchy shake of the whole panel timed to the explosion. */
.btPanel.btArenaShake{animation:btArenaShake .45s cubic-bezier(.36,.07,.19,.97)}
@keyframes btArenaShake{
  0%,100%{transform:translate(0,0) rotate(0)}
  10%{transform:translate(-10px,6px) rotate(-1.2deg)}22%{transform:translate(12px,-7px) rotate(1.4deg)}
  34%{transform:translate(-11px,-5px) rotate(-1deg)}46%{transform:translate(9px,6px) rotate(1deg)}
  58%{transform:translate(-7px,-4px) rotate(-.6deg)}70%{transform:translate(6px,3px) rotate(.5deg)}
  82%{transform:translate(-3px,-2px) rotate(-.3deg)}92%{transform:translate(2px,1px) rotate(0)}
}
.btExplosionBurst{position:absolute;inset:-40px;pointer-events:none;z-index:6}
.btExplosionFlash{position:absolute;top:50%;left:50%;width:170px;height:170px;margin:-85px 0 0 -85px;
  border-radius:50%;background:radial-gradient(circle,#fff 0%,#fff 15%,#ffd76b 40%,rgba(255,92,122,.75) 65%,transparent 78%);
  opacity:0;animation:btFlashPop .5s ease-out forwards;mix-blend-mode:screen}
@keyframes btFlashPop{0%{opacity:0;transform:scale(.15)}25%{opacity:1;transform:scale(1.05)}55%{opacity:.9;transform:scale(1.3)}100%{opacity:0;transform:scale(2.2)}}
.btShard{position:absolute;top:50%;left:50%;width:9px;height:9px;border-radius:1.5px;
  background:#ffcf4a;transform:translate(-50%,-50%);opacity:1;box-shadow:0 0 6px currentColor;
  animation:btShardFly .8s cubic-bezier(.16,.65,.3,1) forwards}
.btShard:nth-child(4n){background:#ff5c7a;width:7px;height:7px}
.btShard:nth-child(4n+1){background:#7ef9ff;width:11px;height:5px}
.btShard:nth-child(4n+2){background:#fff;width:5px;height:5px}
@keyframes btShardFly{
  0%{transform:translate(-50%,-50%) translate(0,0) rotate(0deg) scale(1.4);opacity:1}
  60%{opacity:1}
  100%{transform:translate(-50%,-50%) translate(var(--dx),var(--dy)) rotate(var(--rot,180deg)) scale(.15);opacity:0}
}

/* ---------- Brain Trivia arcade-feel polish (Step 3) ---------- */
/* Active-side glow ring — presentation only, doesn't move/resize anything. */
.btCharSlot{position:relative}
.btCharSlot.btForward::before{content:'';position:absolute;top:6px;left:50%;width:70px;height:70px;
  transform:translateX(-50%);border-radius:50%;background:radial-gradient(circle,rgba(126,249,255,.22),transparent 70%);
  animation:btGlowPulse 1.4s ease-in-out infinite;pointer-events:none}
@keyframes btGlowPulse{0%,100%{opacity:.55;transform:translateX(-50%) scale(1)}50%{opacity:.9;transform:translateX(-50%) scale(1.08)}}
/* Turn-start "ready" pop on the character that just became active. */
.btChar.btReady .btCharBob{animation:btReadyPop .3s ease}
@keyframes btReadyPop{0%{transform:scale(1)}40%{transform:scale(1.16)}100%{transform:scale(1)}}
/* Question "dealt" entrance each new turn. */
.btArena.btDealt{animation:btDealIn .25s ease}
@keyframes btDealIn{0%{opacity:0;transform:translateY(6px) scale(.98)}100%{opacity:1;transform:translateY(0) scale(1)}}
/* Countdown: quick pop per tick, GO! reads more energetic than the numbers. */
.btCountdownNum.btGo{color:#4ade80;animation:btGoPop .4s ease}
@keyframes btGoPop{0%{transform:scale(.5) rotate(-4deg);opacity:0}55%{transform:scale(1.22) rotate(2deg)}100%{transform:scale(1) rotate(0);opacity:1}}
/* Timer urgency stages — visual only, the real deadline never changes. */
.btTimerBar i.mid{background:#ffcf4a}
.btTimerBar i.danger{background:#ff5c7a;animation:btTimerDanger .35s ease-in-out infinite}
@keyframes btTimerDanger{0%,100%{transform:scaleY(1)}50%{transform:scaleY(1.6)}}
.btTimerBar.btDangerWrap{animation:btBarPulse .35s ease-in-out infinite}
@keyframes btBarPulse{0%,100%{box-shadow:0 0 0 rgba(255,92,122,0)}50%{box-shadow:0 0 8px rgba(255,92,122,.6)}}
/* Correct/wrong flashes framing the arena — never covers the question. */
.btArena.btFlashGood{animation:btFlashGood .5s ease}
@keyframes btFlashGood{0%{box-shadow:0 0 0 2px rgba(74,222,128,.7)}100%{box-shadow:0 0 0 2px rgba(74,222,128,0)}}
.btArena.btFlashBad{animation:btFlashBad .5s ease}
@keyframes btFlashBad{0%{box-shadow:0 0 0 2px rgba(255,92,122,.7)}100%{box-shadow:0 0 0 2px rgba(255,92,122,0)}}
.btEliminationMsg{padding:18px 0;font-family:'Press Start 2P',monospace;font-size:13px;line-height:2;color:#ff5c7a}
.btEliminationMsg span{display:block;font-family:'IBM Plex Sans',sans-serif;font-size:13px;color:#c9c9e8;margin-top:6px}
.btArena input:disabled,.btArena button:disabled{opacity:.55;cursor:default}
.btArena button.btnPrimary:active:not(:disabled){transform:scale(.97)}
#btResultBox.btResultWin{border-color:#4ade80;box-shadow:0 0 0 1px rgba(74,222,128,.25),0 0 24px rgba(74,222,128,.18)}
#btResultBox.btResultWin h3{color:#4ade80}
#btResultBox.btResultLose{border-color:#ff5c7a}
#btResultBox.btResultLose h3{color:#ff5c7a}

@media(max-width:520px){
  .btPanel{padding:20px 14px}
  .btAvatar{width:52px;height:52px;font-size:16px}
  .btVs{gap:12px}
  .btRoomBox b{font-size:18px}
  .btCountdownNum{font-size:48px;padding:40px 0}
  .btCharSlot{width:56px}
  .btChar{width:46px;height:56px}
  .btCharSlotA.btForward .btChar{transform:translateX(10px) scale(1.06)}
  .btCharSlotB.btForward .btChar{transform:translateX(-10px) scale(1.06)}
  .btCharLabel{font-size:9px}
  .btCharSlot.btForward::before{width:50px;height:50px}
  .btEliminationMsg{font-size:11px;padding:12px 0}
  .btEliminationMsg span{font-size:12px}
}

/* ---------- dashboard ---------- */
.dashTop{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;flex-wrap:wrap}
.dashTopRight{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.streakPill{display:inline-flex;align-items:center;gap:7px;font-size:13px;font-weight:600;color:var(--flame);
  background:var(--flame-soft);border:1px solid var(--flame-line);border-radius:14px;padding:8px 14px;white-space:nowrap}
.streakPill .icon{width:15px;height:15px;color:var(--flame)}
.dailyGoal{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:14px 18px;margin:18px 0 4px}
.dailyGoalHead{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:9px}
.dailyGoalHead>div{display:flex;flex-direction:column;gap:2px}
.dailyGoalHead b{font-size:14px}
.dailyGoalHead span{font-size:12.5px;font-weight:500;color:var(--muted)}
#dailyGoalStatus{font-weight:600;color:var(--accent);white-space:nowrap}
.dailyGoalBar{height:7px;background:var(--edge);border-radius:var(--radius-pill);overflow:hidden}
.dailyGoalBar i{display:block;width:0;height:100%;background:var(--good);
  border-radius:inherit;transition:width .25s ease}
.deckGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:22px}
.deckCard{background:var(--card);border:1.5px solid var(--deck-accent-border,var(--edge));border-radius:var(--radius);
  padding:20px;cursor:pointer;transition:border-color .18s}
.deckCard:hover{border-color:var(--deck-accent,var(--accent))}
.deckCard .deckIcon{width:38px;height:38px;border-radius:11px;background:var(--deck-accent-soft,var(--accent-soft));
  color:var(--deck-accent,var(--accent));display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.deckCard .deckIcon .icon{width:20px;height:20px}
.deckCard h3{font-size:16px;font-weight:600;margin-bottom:8px;line-height:1.35}
.deckCard .meta{display:flex;gap:14px;color:var(--muted);font-size:13px;font-weight:600}
.deckCard .meta span{display:inline-flex;align-items:center;gap:5px}
.deckCard .meta .icon{width:14px;height:14px}
.deckAccentPurple{--deck-accent:#6d28d9;--deck-accent-soft:#f3e8ff;--deck-accent-border:#e9d5ff}
.deckAccentBlue{--deck-accent:#0369a1;--deck-accent-soft:#e0f2fe;--deck-accent-border:#bae6fd}
.deckAccentTeal{--deck-accent:#0f766e;--deck-accent-soft:#ccfbf1;--deck-accent-border:#99f6e4}
.deckAccentGreen{--deck-accent:#15803d;--deck-accent-soft:#dcfce7;--deck-accent-border:#bbf7d0}
.deckAccentOrange{--deck-accent:#c2410c;--deck-accent-soft:#ffedd5;--deck-accent-border:#fed7aa}
.deckAccentPink{--deck-accent:#be185d;--deck-accent-soft:#fce7f3;--deck-accent-border:#fbcfe8}
.newDeckCard{display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:8px;border:2px dashed var(--edge2);background:transparent;box-shadow:none;
  color:var(--accent);font-weight:600;min-height:120px}
.newDeckCard:hover{background:var(--accent-soft);border-color:var(--accent-line)}
.newDeckCard .plusIc{width:34px;height:34px;border-radius:50%;background:var(--accent-soft);
  display:flex;align-items:center;justify-content:center}
.newDeckCard .plusIc .icon{width:20px;height:20px}
.newDeckCard:hover .plusIc{background:var(--card)}
.emptyNote{color:var(--muted);font-size:14px;background:var(--card);border:1px solid var(--edge);
  border-radius:var(--radius);padding:24px;margin-top:6px;line-height:1.6}

/* ---------- upload / new deck ---------- */
.panel{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  padding:26px}
.srcTabs{display:flex;gap:8px;margin-bottom:20px;flex-wrap:wrap}
.srcTab{display:inline-flex;align-items:center;gap:7px;border:1.5px solid var(--edge2);background:var(--card);
  border-radius:14px;padding:9px 16px;font-size:13.5px;font-weight:600;
  color:var(--muted);cursor:pointer;transition:.18s}
.srcTab .icon{width:16px;height:16px}
.srcTab.active{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
textarea#pasteBox{min-height:220px;resize:vertical;line-height:1.6}
.dropZone{display:flex;flex-direction:column;align-items:center;gap:10px;
  border:2px dashed var(--edge2);border-radius:var(--radius);padding:38px 20px;
  text-align:center;color:var(--muted);font-size:14px;cursor:pointer;transition:.18s;line-height:1.6}
.dropZone .icon{width:30px;height:30px;color:var(--accent)}
.dropZone:hover,.dropZone.drag{border-color:var(--accent);background:var(--accent-soft)}
.dropZone b{color:var(--text)}
#fileInfo,#photoInfo{display:flex;align-items:center;gap:7px;justify-content:center;
  margin-top:12px;font-size:13.5px;font-weight:600;color:var(--good)}
#fileInfo .icon,#photoInfo .icon{width:16px;height:16px}
.honestyNote{display:flex;gap:9px;align-items:flex-start;background:#fbf7ee;border:1px solid #ecdfb8;
  border-radius:var(--radius-sm);padding:12px 15px;font-size:13px;color:#7a6420;margin:18px 0}
.honestyNote .icon{width:17px;height:17px;color:#b98a1a;margin-top:1px}
#genStatus{text-align:center;padding:28px 10px;display:none}
#genStatus.show{display:block}
.spinner{width:36px;height:36px;border:3.5px solid var(--accent-line);border-top-color:var(--accent);
  border-radius:50%;margin:0 auto 14px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
#genStatus p{color:var(--muted);font-size:14px}
.errBox{background:var(--bad-soft);color:var(--bad);border-radius:var(--radius-sm);padding:12px 15px;
  font-size:13.5px;font-weight:500;margin-top:14px;display:none}
.errBox.show{display:block}

/* ---------- draft review ---------- */
.draftSection{margin-top:24px}
.draftSection h3{display:flex;align-items:center;gap:8px;font-size:15px;font-weight:600;margin-bottom:12px}
.draftSection h3 .icon{width:18px;height:18px;color:var(--accent)}
.draftItem{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius-sm);
  box-shadow:var(--shadow-sm);padding:15px;margin-bottom:11px;position:relative}
.draftItem textarea{min-height:44px;font-size:14px;resize:vertical;margin-bottom:8px}
.draftItem .rowLabel{font-size:11px;font-weight:700;letter-spacing:.06em;color:var(--muted);
  text-transform:uppercase;margin-bottom:4px}
.delItem{position:absolute;top:11px;right:11px;border:none;background:var(--bad-soft);color:var(--bad);
  width:28px;height:28px;border-radius:9px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center}
.delItem .icon{width:15px;height:15px}
.delItem:hover{filter:brightness(.97)}
.optRow{display:flex;gap:8px;align-items:center;margin-bottom:6px}
/* Custom-drawn radio (not the browser's native control) so it always matches
   the app's own palette in both themes, instead of the OS's default ring. */
.optRow input[type=radio]{appearance:none;-webkit-appearance:none;margin:0;flex:0 0 auto;
  width:18px;height:18px;border-radius:50%;border:2px solid var(--edge2);
  background:var(--card);cursor:pointer;position:relative;transition:border-color .15s}
.optRow input[type=radio]:hover{border-color:var(--good)}
.optRow input[type=radio]:checked{border-color:var(--good)}
.optRow input[type=radio]:checked::after{content:'';position:absolute;inset:3px;
  border-radius:50%;background:var(--good)}
.optRow input[type=text]{font-size:14px;padding:9px 12px}
.saveBar{position:sticky;bottom:0;background:rgba(250,249,254,.97);
  padding:14px 0;display:flex;gap:10px;align-items:center;border-top:1px solid var(--edge);margin-top:22px}
.saveBar .btnPrimary{width:auto;flex:1}

/* ---------- deck view ---------- */
.modeGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:16px}
.modeCard{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  padding:22px;cursor:pointer;transition:border-color .18s}
.modeCard:hover:not(.disabled){border-color:var(--accent)}
.modeCard.disabled{opacity:.5;cursor:not-allowed}
.modeCard .ic{width:44px;height:44px;border-radius:12px;background:var(--accent-soft);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.modeCard .ic .icon{width:22px;height:22px}
.modeCard h3{font-size:16px;font-weight:600;margin-bottom:5px}
.modeCard p{color:var(--muted);font-size:13px;line-height:1.5}
.deckSectionLabel{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--muted);margin:22px 0 12px}
.deckSectionLabel:first-of-type{margin-top:4px}
.deckSectionLabelPlay{color:var(--accent)}
.modeBadge{position:absolute;top:16px;right:16px;font-size:10px;font-weight:700;letter-spacing:.04em;
  color:var(--accent);background:var(--accent-soft);border-radius:var(--radius-pill);padding:3px 9px}
.modeBadgeVs{color:#b5762a;background:rgba(181,118,42,.14)}
.modeCta{display:block;margin-top:14px;font-size:13px;font-weight:600;color:var(--accent)}
.gameCard,.modeCard.deckPlayCard{position:relative}
.deckPlayGrid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-bottom:6px}
.deckPlayCard{padding:16px;text-align:left;background:var(--card);border:1px solid var(--edge);
  border-radius:var(--radius);cursor:pointer;font:inherit;color:inherit;width:100%}
.deckPlayCard:hover{border-color:var(--accent)}
.deckPlayCard .ic{margin-bottom:10px}
.deckPlayCard h3{font-size:14px;font-weight:600;margin:0}
.deckViewActions{display:flex;gap:18px;margin-top:28px}
.deckViewActions button{display:inline-flex;align-items:center;gap:7px;color:var(--muted);
  background:none;border:none;font-size:13px;font-weight:600;cursor:pointer;padding:0}
.deckViewActions .icon{width:15px;height:15px}
#editDeckBtn:hover{color:var(--accent)}
#deleteDeckBtn:hover{color:var(--bad)}
.deckViewActions #shareDeckBtn{background:var(--accent-soft);border:1px solid var(--accent-line);
  color:var(--accent);padding:8px 12px;border-radius:14px}
.deckViewActions #shareDeckBtn:hover{border-color:var(--accent)}
.deckViewActions .planLocked::after{content:'Pro';font-size:9px;font-weight:700;letter-spacing:.04em;
  color:var(--accent);background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:8px;padding:2px 5px}
.shareStatus{font-size:12.5px;color:var(--muted);margin-top:10px;line-height:1.5}

/* ---------- progress bar (flashcards + test) ---------- */
.progressWrap{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.progressText{color:var(--muted);font-size:13px;font-weight:600;white-space:nowrap}
.aiDisclaimer{color:var(--muted);font-size:11.5px;font-weight:500;line-height:1.4;
  text-align:center;margin:-6px 0 12px}
.progressBar{flex:1;height:8px;background:var(--edge);border-radius:var(--radius-pill);overflow:hidden}
.progressBar i{display:block;height:100%;background:var(--accent);border-radius:var(--radius-pill);
  transition:width .35s cubic-bezier(.4,.2,.2,1)}

/* ---------- flashcards (real 3D flip) ---------- */
.studyStage{max-width:580px;margin:0 auto;text-align:center}
.flip{perspective:1600px;cursor:pointer;height:300px;margin-bottom:6px}
.flip-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;
  transition:transform .55s cubic-bezier(.4,.15,.2,1)}
.flip.flipped .flip-inner{transform:rotateY(180deg)}
.flip-face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  display:flex;flex-direction:column;align-items:center;justify-content:center;overflow:auto;
  background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);box-shadow:var(--shadow-sm);
  padding:34px 28px;font-size:20px;font-weight:600;line-height:1.45}
.flip-back{transform:rotateY(180deg);background:var(--accent-soft);border-color:var(--accent-line);color:var(--text)}
.flashMcq{width:100%;display:flex;flex-direction:column;gap:18px}
.flashMcqQuestion,.flashMcqAnswer{text-align:center}
.flashMcqChoices{width:min(100%,460px);margin:0 auto;display:grid;gap:7px;text-align:left;
  font-size:16px;font-weight:500}
.flashMcqChoice,.flashMcqExplanation{overflow-wrap:anywhere}
.flashMcqBack{align-items:center}
.flashMcqExplanation{font-size:16px;font-weight:500;text-align:center}
.flip .sideTag{position:absolute;top:16px;left:18px;font-size:11px;font-weight:700;
  letter-spacing:.09em;color:var(--muted);text-transform:uppercase}
.flip-back .sideTag{color:var(--accent)}
.flipHint{display:inline-flex;align-items:center;gap:6px;color:var(--muted);font-size:12.5px;margin-top:14px}
.flipHint .icon{width:14px;height:14px}
.markRow{display:flex;gap:12px;margin-top:20px}
.markRow .btn{flex:1}
.resultBox{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  padding:34px 28px;text-align:center}
.resultRing{width:132px;height:132px;margin:0 auto 6px;position:relative}
.resultRing svg{width:100%;height:100%;transform:rotate(-90deg)}
.resultRing .ringVal{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;
  justify-content:center;font-family:'IBM Plex Sans',sans-serif;font-weight:700}
.resultRing .ringVal .big{font-size:32px;line-height:1}
.resultRing .ringVal .sub{font-size:11px;font-weight:600;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;margin-top:3px}
.resultBox h3{font-size:19px;font-weight:700;margin:14px 0 4px}
.resultBox p{color:var(--muted);margin:0 0 20px;font-size:14px}
.resultBox .btn+.btn{margin-top:10px}

/* ---------- test & quiz ---------- */
.qCard{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  padding:26px;text-align:left}
.qText{font-size:17px;font-weight:600;margin-bottom:18px;line-height:1.45}
.ansBtn{display:flex;align-items:center;gap:10px;width:100%;text-align:left;background:var(--card);
  border:1.5px solid var(--edge2);border-radius:var(--radius-sm);padding:14px 16px;font-size:14.5px;
  font-weight:500;cursor:pointer;margin-bottom:10px;transition:border-color .15s, background .15s}
.ansBtn:hover:not(:disabled){border-color:var(--accent)}
.ansBtn:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring)}
.ansBtn .mark{width:20px;height:20px;flex:0 0 auto;color:var(--muted);display:inline-flex}
.ansBtn .mark .icon{width:20px;height:20px}
.ansBtn.correct{border-color:var(--good);background:var(--good-soft);font-weight:600}
.ansBtn.correct .mark{color:var(--good)}
.ansBtn.wrong{border-color:var(--bad);background:var(--bad-soft)}
.ansBtn.wrong .mark{color:var(--bad)}
.ansBtn:disabled{cursor:default}
.revealBox{background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:var(--radius-sm);
  padding:13px 15px;font-size:14px;margin-top:12px;display:none}
.revealBox.show{display:block}
.selfMark{display:none;gap:10px;margin-top:14px}
.selfMark.show{display:flex}
.selfMark .btn{flex:1}
/* AI-graded short-answer result — replaces the honor-system buttons when grading succeeds */
.gradeResult{display:none;align-items:center;gap:8px;border-radius:var(--radius-sm);
  padding:13px 15px;margin-top:12px;font-size:14px;line-height:1.5}
.gradeResult.show{display:flex}
.gradeResult.thinking{color:var(--muted);font-style:italic}
.gradeResult.right{background:var(--good-soft);border:1px solid var(--good-line);color:var(--text)}
.gradeResult.right .icon{color:var(--good);flex:0 0 auto}
.gradeResult.wrong{background:var(--bad-soft);border:1px solid var(--bad-line);color:var(--text)}
.gradeResult.wrong .icon{color:var(--bad);flex:0 0 auto}
#quizTop{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px;
  font-family:'IBM Plex Sans',sans-serif;font-weight:600;font-size:14px}
#quizTop span{display:inline-flex;align-items:center;gap:6px}
#quizTop .icon{width:17px;height:17px}
#quizStreak{color:var(--accent)} #quizScore{color:var(--text)} #quizProgress{color:var(--muted)}
.timerBar{height:8px;background:var(--edge);border-radius:var(--radius-pill);overflow:hidden;margin-bottom:18px}
.timerBar i{display:block;height:100%;background:var(--accent);border-radius:var(--radius-pill);transition:width .2s linear}
.timerBar i.low{background:var(--bad)}
#nextBtn,#tNextBtn{margin-top:14px;width:100%;display:none}
#nextBtn.show,#tNextBtn.show{display:block}

/* ---------- modal & toast ---------- */
.modal{position:fixed;inset:0;z-index:90;display:none;align-items:center;justify-content:center;
  background:rgba(27,23,38,.58);padding:18px}
.modal.open{display:flex}
.modalCard{width:min(430px,94vw);background:var(--card);border-radius:20px;box-shadow:var(--shadow-lg);
  padding:30px;text-align:center;position:relative;animation:fadeUp .3s ease}
.modalCard .crown{width:52px;height:52px;border-radius:14px;background:var(--accent-soft);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.modalCard .crown .icon{width:26px;height:26px}
.modalCard h3{font-size:19px;font-weight:700;margin-bottom:8px}
.modalCard p{color:var(--muted);font-size:14px;margin-bottom:18px;line-height:1.55}
.proBenefits{list-style:none;text-align:left;margin:0 0 18px;border-top:1px solid var(--edge)}
.proBenefits li{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;font-weight:500;
  color:var(--text);padding:11px 2px;border-bottom:1px solid var(--edge)}
.proBenefits li .icon{width:18px;height:18px;color:var(--good);flex:0 0 auto;margin-top:1px}
.modalPrice{font-family:'IBM Plex Sans',sans-serif;font-weight:700;color:var(--text);font-size:16px;margin-bottom:16px}
.modalOr{display:flex;align-items:center;gap:12px;margin:14px 0}
.modalOr::before,.modalOr::after{content:'';flex:1;height:1px;background:var(--edge)}
.modalOr span{font-size:11.5px;font-weight:600;letter-spacing:.04em;color:var(--muted);text-transform:uppercase}
.modalX{position:absolute;top:14px;right:15px;border:none;background:var(--bg);width:30px;height:30px;
  border-radius:50%;cursor:pointer;color:var(--muted);display:inline-flex;align-items:center;justify-content:center}
.modalX .icon{width:16px;height:16px}
.modalX:hover{color:var(--text)}
#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,90px);background:#241f33;
  color:#fff;border-radius:var(--radius-sm);padding:12px 20px;font-weight:600;font-size:13.5px;
  transition:transform .3s;z-index:120;box-shadow:var(--shadow-lg);max-width:88vw;text-align:center}
#toast.show{transform:translate(-50%,0)}

@media(max-width:560px){
  .shell{padding:18px 12px 60px}
  header.appBar{padding:10px 12px;gap:9px;flex-wrap:wrap}
  header.appBar .logo{font-size:18px}
  #usagePill{font-size:11px;padding:5px 9px}
  #upgradeBtn{margin-left:auto}
  #mainNav{width:100%;margin-bottom:22px}
  .navTab{flex:1;justify-content:center;padding:9px 10px}
  .dashTopRight{width:100%;align-items:stretch}
  .dashTopRight .btn{flex:1}
  .dailyGoalHead{align-items:flex-start}
  .deckGrid,.modeGrid{grid-template-columns:1fr;gap:12px}
  .panel{padding:18px}
  .srcTabs{display:grid;grid-template-columns:1fr;gap:7px}
  .srcTab{justify-content:center;border-radius:var(--radius-sm)}
  .dropZone{padding:30px 16px}
  .deckViewActions{display:grid;grid-template-columns:1fr 1fr;gap:14px 18px}
  .deckViewActions button{min-height:32px}
  .deckViewActions #shareDeckBtn{justify-content:center}
  .markRow{flex-direction:column}
  .saveBar{align-items:stretch}
  .landingHeadline{font-size:28px}
  .authCard{padding:26px 20px}
  .plansScreen{padding:72px 16px 48px}
  .plansBack{top:20px;left:12px}
  .tierBox{padding:26px 20px}
  .tutorRow{flex-direction:column}
  .tutorRow .btn{width:100%}
  .flip{height:270px}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .flip-inner{transition:none}
}

/* Match Up and Lightning Round */
#mmTop,#tfTop{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;
  font-weight:600;font-size:14px}
#mmTop span,#tfTop span{display:inline-flex;align-items:center;gap:6px}
#mmTop .icon,#tfTop .icon{width:17px;height:17px}
#mmMoves,#tfScore{color:var(--accent)}

.matchGrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.matchTile{position:relative;min-height:104px;padding:12px;border:1px solid var(--accent-line);
  border-radius:var(--radius-sm);background:var(--accent-soft);cursor:pointer;color:var(--text);
  font-size:13px;line-height:1.45;font-weight:500;text-align:center;
  display:flex;align-items:center;justify-content:center;
  transition:background .15s,border-color .15s,transform .15s}
.matchTile span{visibility:hidden}
.matchTile::after{content:"?";position:absolute;inset:0;display:flex;align-items:center;
  justify-content:center;color:var(--accent);font-size:24px;font-weight:700;font-family:'IBM Plex Sans',sans-serif}
.matchTile:hover:not(.revealed):not(.matched){transform:translateY(-2px);border-color:var(--accent)}
.matchTile.revealed{background:var(--card);border-color:var(--accent)}
.matchTile.revealed span{visibility:visible}
.matchTile.revealed::after{content:none}
.matchTile.matched{background:var(--good-soft);border-color:var(--good);cursor:default}
.matchTile.matched span{visibility:visible}
.matchTile.matched::after{content:none}

.tfShown{background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:var(--radius-sm);
  padding:13px 15px;margin:12px 0 16px;font-weight:600;text-align:center}
.tfBtns{display:grid;grid-template-columns:1fr 1fr;gap:10px}
@media(max-width:520px){.tfBtns{grid-template-columns:1fr}}

/* Activity colors */

/* Study modes — each mode owns a hue (icon chip + hover edge) */
#modeTest .ic{background:var(--teal-soft);color:var(--teal)}
#modeTest:hover{border-color:var(--teal-line)}
#modeQuiz .ic{background:var(--coral-soft);color:var(--coral)}
#modeQuiz:hover{border-color:var(--coral-line)}

/* Games hub — same idea, one identity color per game */
#gameStarCard .ic{background:var(--sky-soft);color:var(--sky)}
#gameStarCard:hover{border-color:var(--sky-line)}
#gamePongCard .ic{background:var(--good-soft);color:var(--good)}
#gamePongCard:hover{border-color:var(--good)}
#gameTriviaCard .ic{background:var(--coral-soft);color:var(--coral)}
#gameTriviaCard:hover{border-color:var(--coral-line)}
#gameMatchCard .ic{background:var(--sun-soft);color:var(--sun)}
#gameMatchCard:hover{border-color:var(--sun-line)}
#gameTFCard .ic{background:var(--teal-soft);color:var(--teal)}
#gameTFCard:hover{border-color:var(--teal-line)}

/* Rapid fire + Trivia Duel scoreboards lean coral (they're the "heat" games) */
#quizStreak{color:var(--coral)}
#tdStreak{color:var(--coral)}

/* Match Up goes amber — tiles no longer purple-on-purple */
#mmTop,#tfTop{font-family:'IBM Plex Sans',sans-serif}
#mmMoves{color:var(--sun)}
.matchTile{background:var(--sun-soft);border-color:var(--sun-line)}
.matchTile::after{color:var(--sun)}
.matchTile:hover:not(.revealed):not(.matched){border-color:var(--sun)}
.matchTile.revealed{background:var(--card);border-color:var(--sun)}

/* Lightning Round goes teal — score, shown answer, and timer */
#tfScore{color:var(--teal)}
.tfShown{background:var(--teal-soft);border-color:var(--teal-line)}
#tfTimerFill{background:var(--teal)}
#tfTimerFill.low{background:var(--bad)}

/* Empty states */
.emptyState{grid-column:1/-1;display:flex;flex-direction:column;align-items:center;text-align:center;
  padding:48px 24px;background:var(--card);border:1.5px dashed var(--edge2);border-radius:var(--radius)}
.emptyState .emptyIcon{width:52px;height:52px;border-radius:14px;background:var(--accent-soft);color:var(--accent);
  display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.emptyState .emptyIcon .icon{width:24px;height:24px}
.emptyState h3{font-size:16px;font-weight:600;margin-bottom:6px}
.emptyState p{color:var(--muted);font-size:13.5px;line-height:1.6;max-width:360px}

/* Celebration confetti */
.confettiPiece{position:fixed;top:-12px;width:8px;height:14px;border-radius:2px;pointer-events:none;
  z-index:200;opacity:.95;animation:confettiFall 1.3s cubic-bezier(.36,.07,.19,.97) forwards}
@keyframes confettiFall{
  0%{transform:translateY(0) rotate(0deg)}
  100%{transform:translateY(100vh) rotate(560deg);opacity:0}
}

/* Public landing page */
.landingPage{
  --landing-bg:#081713;--landing-panel:#10231d;--landing-panel-2:#152c25;
  --landing-line:rgba(191,218,203,.14);--landing-text:#f7f4eb;--landing-muted:#9aada4;
  --landing-blue:#B4A3FF;--landing-blue-strong:#6A43E4;
  color:var(--landing-text);font-family:'IBM Plex Sans',sans-serif;background-color:var(--landing-bg);
  background-image:linear-gradient(rgba(166,198,181,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(166,198,181,.045) 1px,transparent 1px),radial-gradient(circle at 76% 8%,rgba(66,130,106,.2),transparent 28%);
  background-size:46px 46px,46px 46px,100% 100%;overflow-x:hidden}
.landingPage h1,.landingPage h2,.landingPage h3{font-family:'Archivo Black','IBM Plex Sans',sans-serif}
.landingBrand{font-family:'IBM Plex Sans',sans-serif}
.landingPage a{text-decoration:none}
.landingNav{height:76px;max-width:1200px;margin:0 auto;padding:0 28px;display:flex;align-items:center;
  justify-content:space-between;border-bottom:1px solid var(--landing-line);position:relative;z-index:10}
.landingBrand{display:inline-flex;align-items:center;gap:10px;color:var(--landing-text);font-size:20px;font-weight:800;letter-spacing:-.04em}
.brandLogo{display:block;width:auto;max-width:100%}
.previewMiniBrand img{display:inline-block;vertical-align:-3px;margin-right:2px}
.landingBrand span:not(.brandMark){color:var(--landing-blue-strong)}
.brandMark{width:31px;height:31px;border-radius:9px;display:inline-flex;align-items:center;justify-content:center;
  color:#fff;background:linear-gradient(145deg,#9B84FF,#6A43E4);box-shadow:0 9px 28px rgba(117,80,242,.3)}
.brandMark .icon{width:17px;height:17px}
.landingNavLinks{display:flex;align-items:center;gap:34px}
.landingNavLinks a,.navLogin{color:var(--landing-muted);font-size:14px;font-weight:600;transition:color .2s}
.landingNavLinks a:hover,.navLogin:hover{color:#fff}
.landingNavActions{display:flex;align-items:center;gap:20px}
.landingButton{display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:51px;padding:0 24px;
  border:1px solid var(--landing-blue);border-radius:10px;background:linear-gradient(135deg,#8F72F5,#6A43E4);color:#fff;
  font-size:15px;font-weight:700;box-shadow:0 14px 35px rgba(117,80,242,.25);transition:transform .2s,box-shadow .2s,background .2s}
.landingButton:hover{transform:translateY(-2px);box-shadow:0 18px 40px rgba(117,80,242,.36)}
.landingButtonSmall{min-height:40px;padding:0 18px;border-radius:8px;font-size:13px;box-shadow:none}
.landingButtonGhost{border-color:var(--landing-line);background:rgba(16,39,31,.55);color:#dce9e2;box-shadow:none}
.landingButtonGhost:hover{border-color:rgba(139,199,173,.4);background:rgba(24,52,43,.75);box-shadow:none}
.landingHero{max-width:1200px;min-height:690px;margin:0 auto;padding:108px 28px 96px;display:grid;
  grid-template-columns:minmax(0,.95fr) minmax(440px,1.05fr);gap:70px;align-items:center}
.heroCopy{position:relative;z-index:2;animation:landingRise .7s ease both}
.eyebrow,.sectionKicker{display:inline-flex;align-items:center;gap:9px;color:#7C5CFF;text-transform:uppercase;
  letter-spacing:.16em;font-size:11px;font-weight:800}
.eyebrow{padding:8px 12px;border:1px solid rgba(124,92,255,.26);border-radius:999px;background:rgba(124,92,255,.08)}
.eyebrow span{width:6px;height:6px;border-radius:50%;background:#86cdb4;box-shadow:0 0 12px #B4A3FF}
.heroCopy h1{font-size:clamp(52px,6vw,76px);line-height:1.02;letter-spacing:-.065em;margin:24px 0 24px;font-weight:800}
.heroCopy h1 em{font-style:italic;color:var(--accent-bright,#7C5CFF);font-weight:600}
.heroCopy>p{max-width:580px;color:var(--landing-muted);font-size:18px;line-height:1.72}
.heroActions{display:flex;align-items:center;gap:13px;margin-top:34px}
.heroFine{display:flex;gap:22px;margin-top:18px;color:#748d82;font-size:12px;font-weight:600}
.productPreview{position:relative;min-height:500px;display:flex;align-items:center;animation:landingRise .8s .12s ease both}
.previewGlow{position:absolute;width:470px;height:470px;left:50%;top:50%;transform:translate(-50%,-50%);
  border-radius:50%;background:rgba(86,153,128,.2);filter:blur(70px)}
.previewWindow{position:relative;width:100%;padding:18px;border:1px solid rgba(184,211,195,.2);border-radius:24px;
  background:rgba(13,31,25,.94);box-shadow:0 40px 90px rgba(0,0,0,.42),0 0 0 8px rgba(255,253,245,.018);transform:rotate(1.4deg)}
.previewTopbar{height:44px;display:flex;align-items:center;justify-content:space-between;padding:0 3px 12px}
.previewMiniBrand{display:flex;align-items:center;gap:8px;font:600 16px/1 'Archivo Black','IBM Plex Sans',sans-serif;color:#7C5CFF}.previewMiniBrand .icon{width:18px;height:18px;color:#7C5CFF}
.previewEnd{color:#8aa097;font-size:10px;font-weight:700}
.previewDeckHeader{display:flex;align-items:end;justify-content:space-between;gap:16px;padding:12px 14px;border:1px solid rgba(184,211,195,.13);border-radius:12px;background:#142a23}
.previewDeckHeader div{display:flex;flex-direction:column}.previewDeckHeader span{color:#789087;font-size:8px;font-weight:700;text-transform:uppercase;letter-spacing:.1em}.previewDeckHeader strong{margin-top:2px;color:#f7f4eb;font:600 17px/1.2 'Archivo Black','IBM Plex Sans',sans-serif}.previewDeckHeader small{color:#789087;font-size:8px;white-space:nowrap}
.previewProgress{display:flex;align-items:center;gap:12px;margin:18px 5px 13px}.previewProgress>span{color:#9aada4;font-size:10px;font-weight:600;white-space:nowrap}.previewProgress>i{display:block;flex:1;height:7px;border-radius:999px;background:#294139;overflow:hidden}.previewProgress>i b{display:block;width:47%;height:100%;border-radius:inherit;background:#8F72F5}
.previewFlashCard{position:relative;min-height:228px;display:flex;align-items:center;justify-content:center;padding:34px 28px;border:1px solid #e8e1d6;border-radius:16px;background:#fffdfa;color:#201c17;box-shadow:0 18px 40px rgba(0,0,0,.24)}
.previewFlashCard p{max-width:390px;text-align:center;font:600 20px/1.45 'IBM Plex Sans',sans-serif}.previewSideTag{position:absolute;top:16px;left:18px;color:#6b6258;font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.09em}
.previewFlipHint{display:flex;align-items:center;justify-content:center;gap:6px;margin:10px 0 12px;color:#8aa097;font-size:10px}.previewFlipHint span{font-size:14px}
.previewMarkRow{display:grid;grid-template-columns:1fr 1fr;gap:10px}.previewMarkRow button{min-height:38px;border:0;border-radius:10px;font:700 10px 'IBM Plex Sans',sans-serif}.previewMarkRow button:first-child{color:#b84545;background:#f9e8e8}.previewMarkRow button:last-child{color:#fff;background:#2e8b57}.previewMarkRow span{margin-right:4px}
.previewPlayList{display:flex;flex-direction:column;gap:8px;margin:16px 5px 14px}
.previewPlayItem{display:flex;align-items:center;gap:10px;padding:9px 12px;border:1px solid rgba(184,211,195,.13);
  border-radius:10px;background:#142a23;color:#dce9e2;font-size:13px;font-weight:600}
.previewPlayItemActive{border-color:rgba(139,199,173,.45);background:#17352b}
.previewPlayIcon{width:26px;height:26px;border-radius:8px;display:flex;align-items:center;justify-content:center;
  background:rgba(124,92,255,.14);color:#7C5CFF;flex-shrink:0}
.previewPlayIcon .icon{width:15px;height:15px}
.previewPlayBadge{margin-left:auto;font-size:9px;font-weight:700;letter-spacing:.04em;color:#7C5CFF;
  background:rgba(124,92,255,.14);border-radius:999px;padding:3px 8px}
.previewPlayBadgeVs{color:#e0a75e;background:rgba(224,167,94,.16)}
.previewStage{position:relative;min-height:150px;display:flex;align-items:center;justify-content:center;padding:26px 24px;
  border:1px solid #e8e1d6;border-radius:16px;background:#fffdfa;color:#201c17;box-shadow:0 18px 40px rgba(0,0,0,.24)}
.previewStage p{max-width:390px;text-align:center;font:600 16px/1.5 'IBM Plex Sans',sans-serif}
.previewStage .previewSideTag{position:absolute;top:14px;left:16px}
.gameShowcaseGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gameShowcaseCard{position:relative;padding:27px}
.gameShowcaseCard .previewPlayBadge{position:absolute;top:22px;right:22px;margin-left:0;background:rgba(124,92,255,.14)}
.gameShowcaseCard h3{font-size:19px;letter-spacing:-.025em;margin:28px 0 10px}
.gameShowcaseCard p{color:var(--landing-muted);font-size:14px;line-height:1.7}
.landingSection{max-width:1200px;margin:0 auto;padding:112px 28px;border-top:1px solid var(--landing-line)}
.sectionIntro{text-align:center;max-width:700px;margin:0 auto 50px}.sectionIntroLeft{text-align:left;margin-left:0}
.sectionIntro h2{font-size:clamp(36px,5vw,54px);line-height:1.08;letter-spacing:-.05em;margin:15px 0 16px;font-weight:800}
.sectionIntro p{color:var(--landing-muted);font-size:16px;line-height:1.65}
.pricingValueLead{display:block;color:var(--landing-text);font-size:18px;font-weight:700}
.pricingValueSupport{display:block;margin-top:4px}
.stepCards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.landingCard{border:1px solid var(--landing-line);border-radius:15px;background:linear-gradient(145deg,rgba(18,43,35,.78),rgba(9,27,21,.8));box-shadow:inset 0 1px rgba(255,255,255,.025)}
.stepCard{position:relative;min-height:280px;padding:31px;overflow:hidden}.cardNumber{position:absolute;right:22px;top:13px;color:rgba(134,190,165,.08);font:700 64px/1 'Archivo Black','IBM Plex Sans',sans-serif}
.stepIcon,.featureIcon{width:48px;height:48px;border:1px solid rgba(124,92,255,.25);border-radius:12px;display:flex;align-items:center;justify-content:center;background:rgba(124,92,255,.09);color:#7C5CFF}
.stepIcon .icon{width:23px;height:23px}.stepCard h3,.featureCard h3{font-size:19px;letter-spacing:-.025em;margin:28px 0 10px}.stepCard p,.featureCard p{color:var(--landing-muted);font-size:14px;line-height:1.7}
.featureSection{display:grid;grid-template-columns:.72fr 1.28fr;gap:74px;align-items:start}.featureSection .sectionIntro{position:sticky;top:110px;margin-bottom:0}
.featureGrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.featureCard{min-height:245px;padding:27px}.featureIcon{width:43px;height:43px}.featureIcon .icon{width:20px;height:20px}
.pricingSection{max-width:none}.pricingSection>.sectionIntro,.pricingGrid,.earlyAccessNote,.earlyAccessMessage{max-width:1144px;margin-left:auto;margin-right:auto}
.earlyAccessMessage{display:flex;align-items:baseline;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:-25px;margin-bottom:30px;color:var(--landing-muted);font-size:12px;line-height:1.5;text-align:center}
.earlyAccessMessage strong{color:#78bfa6;font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}
.pricingGrid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;align-items:stretch}
.pricingCard{position:relative;padding:31px;border:1px solid var(--landing-line);border-radius:16px;background:rgba(9,28,22,.82)}
.pricingCard.recommended{border-color:rgba(124,92,255,.62);background:linear-gradient(180deg,rgba(34,78,63,.62),rgba(10,31,24,.92));box-shadow:0 24px 60px rgba(0,0,0,.22)}
.pricingCard.premium{border-color:rgba(145,172,161,.42);background:linear-gradient(180deg,rgba(28,48,41,.72),rgba(9,28,22,.82))}
.planTag{position:absolute;right:19px;top:19px;max-width:calc(100% - 38px);padding:5px 9px;border:1px solid transparent;border-radius:99px;font-size:9px;font-weight:800;line-height:1.2;text-transform:uppercase;letter-spacing:.1em;white-space:nowrap}
.recommendedTag{background:#3f846d;color:#fff}
.premiumTag{border-color:rgba(154,184,172,.34);background:rgba(154,184,172,.1);color:#b7d2c7}
.pricingCard h3{padding-right:112px;font-size:18px}.price{display:flex;align-items:baseline;gap:6px;margin:20px 0 5px}.price strong{font:700 38px/1 'Archivo Black','IBM Plex Sans',sans-serif;letter-spacing:-.04em}.price span{color:#71849d;font-size:12px}
.priceContext{margin:0 0 8px;color:#78aa99;font-size:11px;font-weight:650;line-height:1.4}
.priceDesc{min-height:44px;color:var(--landing-muted);font-size:13px;line-height:1.55}.priceButton{height:44px;margin:23px 0;display:flex;align-items:center;justify-content:center;border:1px solid rgba(155,197,176,.22);border-radius:9px;color:#dce9e2;font-size:13px;font-weight:700;background:rgba(24,53,43,.72)}
.priceButton:hover{border-color:#B4A3FF}.priceButtonPrimary{border-color:#B4A3FF;background:#6A43E4;color:white}
.pricingCard ul{list-style:none;border-top:1px solid var(--landing-line);padding-top:19px}.pricingCard li{position:relative;padding:7px 0 7px 22px;color:#96aaa0;font-size:12px}.pricingCard li::before{content:'\2713';position:absolute;left:0;color:#78bfa6;font-weight:800}
.earlyAccessNote{margin-top:23px;text-align:center;color:#698077;font-size:11px}
.landingFooter{max-width:1200px;margin:0 auto;padding:36px 28px 45px;border-top:1px solid var(--landing-line);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:28px}
.landingFooter p{color:#647991;font-size:12px;text-align:center}.landingFooter nav{display:flex;justify-content:flex-end;gap:22px}.landingFooter nav a{color:#7d91aa;font-size:12px}.landingFooter nav a:hover{color:#fff}
@keyframes landingRise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}
.accountRule{color:var(--muted);font-size:11.5px;line-height:1.55;text-align:center;margin-top:12px}
.accountRule a,.siteFooter a,.settingsLinks a,.legalContent a{color:var(--accent);font-weight:600}
.siteFooter{min-height:64px;display:flex;align-items:center;justify-content:center;gap:20px;
  flex-wrap:wrap;padding:14px 20px;border-top:1px solid var(--edge);font-size:12.5px}
.siteFooter a{text-decoration:none}
.siteFooter a:hover{text-decoration:underline}

/* Honeypot field: exists in the DOM for bots, invisible to real users */
.hpField{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}

@media(max-width:900px){
  .landingHero{grid-template-columns:1fr;padding-top:78px;gap:48px}.heroCopy{text-align:center}.heroCopy>p{margin-left:auto;margin-right:auto}.heroActions,.heroFine{justify-content:center}
  .productPreview{width:min(680px,100%);margin:0 auto}.stepCards{grid-template-columns:1fr}.stepCard{min-height:220px}.featureSection{grid-template-columns:1fr;gap:38px}.featureSection .sectionIntro{position:static;text-align:center;margin-left:auto}.pricingGrid{grid-template-columns:1fr;max-width:600px}.landingFooter{grid-template-columns:1fr;text-align:center}.landingFooter .landingBrand,.landingFooter nav{justify-content:center}
  .gameShowcaseGrid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .landingNav{height:66px;padding:0 18px}.landingNavLinks,.navLogin{display:none}.landingHero{min-height:0;padding:70px 18px 78px}.heroCopy h1{font-size:47px}.heroCopy>p{font-size:16px}.heroActions{flex-direction:column}.heroActions .landingButton{width:100%}.heroFine{gap:13px}.productPreview{min-height:410px}.previewWindow{transform:none;padding:13px}.previewDeckHeader{align-items:start;flex-direction:column;gap:4px}.previewFlashCard{min-height:210px;padding:30px 17px}.previewFlashCard p{font-size:17px}.landingSection{padding:82px 18px}.sectionIntro{margin-bottom:34px}.sectionIntro h2{font-size:36px}.earlyAccessMessage{margin-top:-12px;margin-bottom:25px;gap:3px;flex-direction:column;align-items:center}.featureGrid{grid-template-columns:1fr}.featureCard{min-height:0}.landingFooter{padding-left:18px;padding-right:18px}.landingFooter nav{gap:15px;flex-wrap:wrap}
  .gameShowcaseGrid{grid-template-columns:1fr}.gameShowcaseCard{padding:22px}.previewStage{padding:20px 16px;min-height:120px}.previewStage p{font-size:14px}
}

/* Dedicated auth page */
.authPage{background:radial-gradient(circle at 50% 0,rgba(117,80,242,.12),transparent 34%),#f7f6f2}
.authPage .authWrap{padding-top:68px;padding-bottom:68px}
.authBack{position:absolute;top:24px;left:28px;color:var(--muted);font-size:13px;font-weight:600;text-decoration:none}
.authBack:hover{color:var(--accent)}

/* Refresh's public site uses the same warm white foundation as the app. */
.landingPage{
  --landing-bg:#ffffff;--landing-panel:#fffdfa;--landing-panel-2:#f7f4ee;
  --landing-line:#e8e1d6;--landing-text:#201c17;--landing-muted:#6b6258;
  background-color:#fff;
  background-image:linear-gradient(rgba(117,80,242,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(117,80,242,.035) 1px,transparent 1px),radial-gradient(circle at 76% 8%,rgba(117,80,242,.08),transparent 28%)}
.landingNav{background:rgba(255,255,255,.88);backdrop-filter:blur(14px)}
.landingNavLinks a,.navLogin{color:#6b6258}
.landingNavLinks a:hover,.navLogin:hover{color:#6A43E4}
.landingButtonGhost{border-color:#d7ccbd;background:#fffdfa;color:#3e3831}
.landingButtonGhost:hover{border-color:#7fae9e;background:#f4faf7}
.heroFine{color:#776f65}
.landingCard{background:linear-gradient(145deg,#fffdfa,#f8f5ef);box-shadow:0 14px 40px -32px rgba(34,28,20,.35)}
.cardNumber{color:rgba(117,80,242,.08)}
.pricingCard{background:#fffdfa;box-shadow:0 16px 46px -36px rgba(34,28,20,.4)}
.pricingCard.recommended{border-color:#76a897;background:linear-gradient(180deg,#edf6f2,#fffdfa)}
.pricingCard.premium{border-color:#cbd8d2;background:linear-gradient(180deg,#f5f8f6,#fffdfa)}
.premiumTag{border-color:#c8d8d1;background:#eef4f1;color:#3f6759}
.priceContext{color:#527c6d}
.priceButton{border-color:#d7ccbd;color:#3e3831;background:#fff}
.pricingCard li{color:#625a51}
.earlyAccessNote{color:#766e65}
.landingFooter p{color:#766e65}
.landingFooter nav a{color:#6b6258}
.landingFooter nav a:hover{color:#6A43E4}

/* Sound toggle */
.sfxToggle{border:none;background:none;color:var(--muted);cursor:pointer;padding:6px;
  display:inline-flex;align-items:center;justify-content:center;border-radius:8px;transition:.15s}
.sfxToggle .icon{width:18px;height:18px}
.sfxToggle:hover{color:var(--accent);background:var(--accent-soft)}

/* Matched pair */
.matchTile.matched{background:var(--good);border-color:var(--good);cursor:default}
.matchTile.matched span{visibility:hidden}
.matchTile.matched::after{content:"";position:absolute;inset:0;
  background:url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="white" stroke-width="2.4" stroke-linecap="round" stroke-linejoin="round"><path d="M20 6L9 17l-5-5"/></svg>') center/26px no-repeat}

/* Usage meter and main navigation */

/* Usage capsule: tiny credits meter inside the pill */
.pillMeter{display:inline-block;width:34px;height:5px;background:var(--edge2);
  border-radius:var(--radius-pill);overflow:hidden;margin-left:8px;vertical-align:2px}
.pillMeter b{display:block;height:100%;background:var(--accent);border-radius:var(--radius-pill);
  transition:width .4s ease}
#usagePill.pro .pillMeter{background:var(--accent-line)}

#upgradeBtn{background:var(--accent);color:#fff}
#upgradeBtn:hover:not(:disabled){background:var(--accent-press)}

/* Nav tabs: sliding pill glides between Library and Games */
#mainNav{position:relative}
#navSlider{position:absolute;top:5px;bottom:5px;left:0;width:0;background:var(--accent-soft);
  border-radius:var(--radius-pill);z-index:0;
  transition:left .28s cubic-bezier(.4,.15,.2,1),width .28s cubic-bezier(.4,.15,.2,1)}
.navTab{position:relative;z-index:1}
.navTab.active{background:transparent}

/* Index-card tab: a small recurring memory-card detail */
.deckCard{position:relative;overflow:hidden}
.deckCard:not(.newDeckCard)::before{content:"";position:absolute;top:0;left:20px;width:40px;height:5px;
  border-radius:0 0 4px 4px;background:var(--deck-accent,var(--accent))}

/* New-set card: plus icon grows slightly when the card is hovered */
.newDeckCard .plusIc{transition:transform .18s ease}
.newDeckCard:hover .plusIc{transform:scale(1.12)}

/* Dark mode */
:root[data-theme="dark"]{
  /* Tells the browser to draw native controls (radio buttons, checkboxes,
     scrollbars) in their dark variant — without this, accent-color only
     tints the checked fill and the unchecked ring stays a stark light-mode white. */
  color-scheme: dark;
  --accent:#A794FF; --accent-bright:#9B84FF; --accent-press:#BFB2FF; --accent-soft:rgba(155,132,255,.18); --accent-line:rgba(155,132,255,.38);
  --ring:rgba(167,148,255,.4);
  --bg:#0D1218; --card:#171C24; --edge:#2A2F38; --edge2:#3A404B;
  --text:#F8F6EE; --muted:#B7B7B0;
  --good:#63d28b; --good-soft:rgba(99,210,139,.16); --good-line:rgba(99,210,139,.34);
  --bad:#ea7373; --bad-soft:rgba(234,115,115,.16); --bad-line:rgba(234,115,115,.34);
  --sun:#F0CB5B; --sun-soft:rgba(240,203,91,.16); --sun-line:rgba(240,203,91,.34);
  --teal:#4FD3C0; --teal-soft:rgba(79,211,192,.16); --teal-line:rgba(79,211,192,.34);
  --sky:#7CADFB; --sky-soft:rgba(124,173,251,.16); --sky-line:rgba(124,173,251,.34);
  --coral:#FF8D82; --coral-soft:rgba(255,141,130,.16); --coral-line:rgba(255,141,130,.34);
  --flame:#F5A15C; --flame-soft:rgba(245,161,92,.16); --flame-line:rgba(245,161,92,.34);
  --shadow-sm:0 1px 2px rgba(0,0,0,.30);
  --shadow:0 1px 2px rgba(0,0,0,.30), 0 12px 30px -14px rgba(0,0,0,.48);
  --shadow-lg:0 24px 60px -20px rgba(0,0,0,.62);
}
:root[data-theme="dark"] .deckAccentPurple{--deck-accent:#c4b5fd;--deck-accent-soft:rgba(196,181,253,.14);--deck-accent-border:rgba(196,181,253,.26)}
:root[data-theme="dark"] .deckAccentBlue{--deck-accent:#7dd3fc;--deck-accent-soft:rgba(125,211,252,.13);--deck-accent-border:rgba(125,211,252,.25)}
:root[data-theme="dark"] .deckAccentTeal{--deck-accent:#5eead4;--deck-accent-soft:rgba(94,234,212,.13);--deck-accent-border:rgba(94,234,212,.25)}
:root[data-theme="dark"] .deckAccentGreen{--deck-accent:#86efac;--deck-accent-soft:rgba(134,239,172,.13);--deck-accent-border:rgba(134,239,172,.25)}
:root[data-theme="dark"] .deckAccentOrange{--deck-accent:#fdba74;--deck-accent-soft:rgba(253,186,116,.13);--deck-accent-border:rgba(253,186,116,.25)}
:root[data-theme="dark"] .deckAccentPink{--deck-accent:#f9a8d4;--deck-accent-soft:rgba(249,168,212,.13);--deck-accent-border:rgba(249,168,212,.25)}
:root[data-theme="dark"] body{
  background:var(--bg);
}
:root[data-theme="dark"] header.appBar{background:rgba(9,9,9,.98)}
:root[data-theme="dark"] .authTab{background:#151515;border-color:#383838}
:root[data-theme="dark"] .authTab.active{background:var(--accent);border-color:var(--accent);color:#07110e}
:root[data-theme="dark"] #toast{background:#0d0b16}
:root[data-theme="dark"] .honestyNote{background:rgba(251,191,36,.08);border-color:rgba(251,191,36,.25);color:#f3d488}
:root[data-theme="dark"] .saveBar{background:rgba(9,9,9,.98)}
:root[data-theme="dark"] #mainNav{background:#111111;border-color:#2b2b2b}
:root[data-theme="dark"] .navTab:hover{background:rgba(117,196,173,.10)}
:root[data-theme="dark"] .navTab.active{background:#171717;color:var(--accent)}
:root[data-theme="dark"] .navTab.active:hover{background:#171717}
:root[data-theme="dark"] .streakPill{background:rgba(238,163,94,.10);border-color:rgba(238,163,94,.22)}
:root[data-theme="dark"] .dailyGoal{background:#161616;border-color:#2b2b2b}
:root[data-theme="dark"] .deckCard{border-color:var(--deck-accent-border,var(--edge))}
:root[data-theme="dark"] .deckCard:hover{border-color:var(--deck-accent,var(--accent))}
:root[data-theme="dark"] .newDeckCard{border-color:var(--edge2)}
:root[data-theme="dark"] .newDeckCard:hover{border-color:var(--accent-line)}
:root[data-theme="dark"] .panel{background:#151515;border-color:#2b2b2b}
:root[data-theme="dark"] .honestyNote .icon{color:var(--sun)}

/* Settings */
.settingsGroup{margin-bottom:26px}
.settingsGroup h3{font-size:12px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--muted);margin-bottom:10px}
.settingRow{display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:var(--card);border:1px solid var(--edge);border-radius:var(--radius-sm);
  padding:14px 16px;margin-bottom:8px}
.settingRow > div:first-child{display:flex;flex-direction:column;gap:2px;min-width:0}
.settingRow b{font-size:14px;font-weight:600}
.settingRow span{font-size:12.5px;color:var(--muted);word-break:break-word}
.dangerSetting{border-color:var(--bad-line)}
.settingsLinks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.settingsLinks a{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius-sm);
  padding:12px 14px;text-decoration:none;font-size:13.5px}
.settingsLinks a:hover{border-color:var(--accent)}
.accountDeleteModal{text-align:left}
.accountDeleteModal h3{text-align:left;padding-right:34px}
.accountDeleteModal p{text-align:left}
.subscriptionDeleteNote{background:var(--sun-soft);border:1px solid var(--sun-line);
  border-radius:var(--radius-sm);padding:11px 13px;color:var(--text)!important}
.accountActionError{min-height:20px;color:var(--bad);font-size:13px;font-weight:600;margin-top:8px}
.accountModalActions{display:flex;gap:10px;margin-top:12px}
.accountModalActions .btn{flex:1}

/* Legal and support pages */
.legalShell{width:min(760px,calc(100% - 32px));margin:0 auto;padding:32px 0 64px}
.legalHeader{display:flex;align-items:center;justify-content:space-between;gap:20px;
  border-bottom:1px solid var(--edge);padding-bottom:20px;margin-bottom:28px}
.legalHeader .logo{text-decoration:none}
.legalBack{color:var(--accent);font-size:13.5px;font-weight:600;text-decoration:none}
.legalContent{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:clamp(24px,5vw,42px)}
.legalContent h1{font-size:clamp(28px,5vw,38px);line-height:1.2;margin-bottom:8px}
.legalUpdated{color:var(--muted);font-size:13px;margin-bottom:28px}
.legalContent h2{font-size:18px;margin:28px 0 8px}
.legalContent p,.legalContent li{font-size:14.5px;line-height:1.75}
.legalContent p{margin-bottom:12px}
.legalContent ul{padding-left:22px;margin:8px 0 14px}
.legalContent li{margin-bottom:6px}
.legalNav{display:flex;gap:14px;flex-wrap:wrap;border-top:1px solid var(--edge);
  margin-top:30px;padding-top:20px;font-size:13px}
.supportContact{background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:var(--radius-sm);padding:16px;margin:16px 0}
.supportContact p{margin:0}
.supportUnavailable{color:var(--muted);font-weight:600}

@media(max-width:560px){
  .settingsLinks{grid-template-columns:1fr}
  .settingRow{align-items:flex-start;flex-direction:column}
  .settingRow .btn{width:100%}
  .accountModalActions{flex-direction:column-reverse}
  .legalHeader{align-items:flex-start;flex-direction:column}
}

/* Toggle switch used for dark mode / sound */
.switchToggle{position:relative;width:44px;height:26px;flex:0 0 auto;border:none;
  border-radius:var(--radius-pill);background:var(--edge2);cursor:pointer;transition:background .2s}
.switchToggle i{position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;
  background:#fff;box-shadow:0 1px 3px rgba(0,0,0,.3);transition:transform .2s cubic-bezier(.4,.15,.2,1)}
.switchToggle.on{background:var(--accent)}
.switchToggle.on i{transform:translateX(18px)}
.switchToggle:focus-visible{outline:none;box-shadow:0 0 0 3px var(--ring)}

/* Spaced review */
#dueBanner{display:flex;align-items:center;justify-content:space-between;gap:14px;
  background:var(--accent-soft);border:1px solid var(--accent-line);border-radius:var(--radius);
  padding:14px 18px;margin-top:20px}
#dueBanner .dueText{display:flex;flex-direction:column;gap:1px;min-width:0}
#dueBanner b{font-size:14.5px;font-weight:600;color:var(--accent)}
#dueBanner span{font-size:12.5px;color:var(--muted)}

/* Progress */
.statGrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin-bottom:22px}
.statTile{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:20px 16px;display:flex;flex-direction:column;gap:3px;align-items:center}
.statTile .statNum{font-family:'IBM Plex Sans',sans-serif;font-size:28px;font-weight:700;line-height:1}
.statTile .statLabel{font-size:12px;font-weight:600;color:var(--muted);letter-spacing:.04em;text-transform:uppercase}
.statTile:nth-child(1) .statNum{color:var(--accent)}
.statTile:nth-child(2) .statNum{color:var(--sky)}
.statTile:nth-child(3) .statNum{color:var(--good)}
.statTile:nth-child(4) .statNum{color:var(--flame)}
.statTile:nth-child(5) .statNum{color:var(--sky)}
.weekPanel{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  box-shadow:var(--shadow-sm);padding:20px}
.weekPanel h3{font-size:12px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--muted);margin-bottom:14px}
.weekRow{display:flex;gap:10px;justify-content:space-between}
.weekDay{flex:1;display:flex;flex-direction:column;align-items:center;gap:7px}
.weekDay i{width:34px;height:34px;border-radius:10px;background:var(--edge);
  display:flex;align-items:center;justify-content:center;font-style:normal}
.weekDay i .icon{width:16px;height:16px;color:#fff}
.weekDay.did i{background:var(--good)}
.weekDay span{font-size:11px;font-weight:600;color:var(--muted)}

/* Forgot password */
.linkBtn{display:block;border:none;background:none;color:var(--accent);font-size:12.5px;
  font-weight:600;cursor:pointer;padding:0;margin-top:8px}
.linkBtn:hover{text-decoration:underline}

/* Plans */
.plansScreen{position:fixed;inset:0;z-index:90;display:none;background:var(--bg);
  overflow-y:auto;padding:48px 24px 64px}
.plansScreen.open{display:block}
.plansInner{max-width:900px;margin:0 auto;text-align:center;animation:fadeUp .3s ease}
.plansBack{position:absolute;top:28px;left:24px;border:none;background:none;color:var(--muted);
  font-weight:600;font-size:14px;cursor:pointer;display:inline-flex;align-items:center;gap:6px;padding:6px}
.plansBack:hover{color:var(--text)}
.plansBack .icon{width:18px;height:18px}
.plansInner h1{font-family:'Archivo Black','IBM Plex Sans',sans-serif;font-size:clamp(26px,4vw,36px);font-weight:700;margin:8px 0 12px}
.plansSub{color:var(--muted);font-size:15px;max-width:560px;margin:0 auto 36px;line-height:1.6}
.tierGrid{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin:0 0 28px;text-align:left}
@media(max-width:680px){.tierGrid{grid-template-columns:1fr}}
.tierBox{border:1px solid var(--edge2);border-radius:var(--radius);padding:32px 28px;
  background:var(--card);display:flex;flex-direction:column;gap:14px;position:relative}
.tierBox h4{padding-right:120px;font-family:'Archivo Black','IBM Plex Sans',sans-serif;font-size:22px}
.tierDesc{color:var(--muted);font-size:14px;margin-top:-10px}
.tierPrice{font-family:'IBM Plex Sans',sans-serif;font-size:34px;font-weight:700;color:var(--text)!important;margin:6px 0 4px!important}
.tierPrice span{font-size:14px;color:var(--muted);font-weight:500}
.tierBox>.btn{width:100%}
.tierBox ul{list-style:none;display:flex;flex-direction:column;gap:12px;font-size:14px;flex:1;
  margin:10px 0 0;padding-top:18px;border-top:1px solid var(--edge)}
.tierBox li{display:flex;gap:9px;align-items:flex-start;line-height:1.5}
.tierBox li .icon{width:17px;height:17px;color:var(--good);flex:0 0 auto;margin-top:2px}
.tierBest{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}
.tierPremium{border-color:var(--edge2)}
.tierTag{position:absolute;top:18px;right:18px;background:var(--accent);color:#fff;
  font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  padding:4px 10px;border:1px solid transparent;border-radius:10px;max-width:calc(100% - 36px);text-align:center}
.tierTagPremium{border-color:var(--edge2);background:var(--bg);color:var(--text)}

/* Deck folders */
.folderHead{grid-column:1/-1;display:flex;align-items:center;gap:8px;margin:14px 0 -4px;
  font-family:'IBM Plex Sans',sans-serif;font-weight:600;font-size:13.5px;color:var(--muted)}
.folderHead .icon{width:16px;height:16px;color:var(--sun)}
#folderList{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
#folderList button{display:flex;align-items:center;gap:10px;width:100%;padding:11px 14px;text-align:left;
  border:1px solid var(--edge);border-radius:var(--radius-sm);background:var(--bg);cursor:pointer;
  font-size:14px;font-weight:500;color:var(--text);transition:border-color .15s}
#folderList button:hover{border-color:var(--accent)}
#folderList button.current{border-color:var(--accent);background:var(--accent-soft)}
#folderList button .icon{width:16px;height:16px;color:var(--sun)}
.folderNewRow{display:flex;gap:8px}
.folderNewRow input{flex:1;margin:0}
.folderNewRow .btn{width:auto;flex:0 0 auto}

/* Study history */
#historyPanel{margin-top:16px}
.historyHead{display:flex;justify-content:space-between;align-items:center;gap:10px}
.historyHead h3{margin-bottom:0}
.histNav{display:flex;align-items:center;gap:4px}
.histNav button{border:1px solid var(--edge);background:var(--card);width:28px;height:28px;
  border-radius:8px;cursor:pointer;color:var(--text);display:inline-flex;align-items:center;justify-content:center}
.histNav button:hover:not(:disabled){border-color:var(--accent);color:var(--accent)}
.histNav button:disabled{opacity:.35;cursor:default}
.histNav button .icon{width:15px;height:15px}
.histNav span{font-size:13px;font-weight:600;min-width:110px;text-align:center}
.calGrid{display:grid;grid-template-columns:repeat(7,1fr);gap:5px;margin-top:14px}
.calDow{font-size:10.5px;font-weight:700;color:var(--muted);text-align:center;
  letter-spacing:.04em;text-transform:uppercase;padding-bottom:2px}
.calCell{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:9px;
  font-size:12px;font-weight:500;color:var(--muted);background:var(--bg)}
.calCell.did{background:var(--good);color:#fff;font-weight:700}
.calCell.today{box-shadow:inset 0 0 0 2px var(--accent)}
.calCell.blank{background:none}
.histAllTime{margin-top:14px;font-size:13px;color:var(--muted)}

/* Free-tier teaser for the locked history panel */
.historyLocked{margin-top:16px;display:flex;align-items:center;gap:14px}
.historyLocked>.icon{width:26px;height:26px;color:var(--muted);flex:0 0 auto}
.historyLocked div{flex:1;display:flex;flex-direction:column;gap:2px}
.historyLocked b{font-size:14px}
.historyLocked span{font-size:12.5px;color:var(--muted);line-height:1.5}
.historyLocked .btn{width:auto;flex:0 0 auto}
@media(max-width:560px){.historyLocked{flex-direction:column;align-items:flex-start}}

/* AI tutor */
.tutorToggle{display:inline-flex;align-items:center;gap:8px;margin:16px auto 0;border:1px solid var(--accent-line);
  background:var(--accent-soft);color:var(--accent);font-weight:600;font-size:13px;cursor:pointer;
  padding:9px 16px;border-radius:14px;transition:.15s}
.tutorToggle:hover{border-color:var(--accent)}
.tutorPanel{background:var(--card);border:1px solid var(--edge);border-radius:var(--radius-sm);
  box-shadow:var(--shadow-sm);padding:14px;margin-top:12px;text-align:left}
.tutorMsgs{display:flex;flex-direction:column;gap:8px;max-height:260px;overflow-y:auto;margin-bottom:10px}
.tutorMsg{padding:9px 13px;border-radius:13px;font-size:13.5px;line-height:1.5;max-width:88%;
  white-space:pre-wrap;word-break:break-word}
.tutorMsg.user{align-self:flex-end;background:var(--accent-soft);border-bottom-right-radius:4px}
.tutorMsg.ai{align-self:flex-start;background:var(--bg);border:1px solid var(--edge);border-bottom-left-radius:4px}
.tutorMsg.thinking{color:var(--muted);font-style:italic}
.tutorRow{display:flex;gap:8px;align-items:stretch}
.tutorRow input{flex:1;margin:0;font-size:13.5px}
.tutorRow .btn{width:auto;flex:0 0 auto}

.missedReviewCta{display:flex;flex-direction:column;align-items:center;gap:7px;
  background:var(--accent-soft);border:1px solid var(--accent-line);
  border-radius:var(--radius-sm);padding:14px;margin:16px 0}
.missedReviewCta b{font-size:14px;color:var(--accent)}
.missedReviewCta span{font-size:12.5px;color:var(--muted)}
.missedReviewCta .btn{margin-top:3px;width:auto}

/* Phone navigation and Library layout. Desktop keeps the existing header and grid. */
@media(max-width:600px){
  body.mobileMenuOpen{overflow:hidden}
  header.appBar{padding:9px 13px;gap:6px;flex-wrap:nowrap}
  header.appBar .logo{font-size:18px;margin-right:auto;min-width:0}
  header.appBar .logo .icon{width:22px;height:22px}
  #usagePill,#upgradeBtn,#signOutBtn,#mainNav{display:none!important}
  #settingsBtn,.mobileHeaderAction,.mobileMenuClose{width:42px;height:42px;padding:0;border:0;
    border-radius:11px;background:transparent;color:var(--text);cursor:pointer;
    align-items:center;justify-content:center;flex:0 0 auto}
  #settingsBtn:hover,.mobileHeaderAction:hover,.mobileMenuClose:hover{background:var(--accent-soft);color:var(--accent)}
  #settingsBtn .icon,.mobileHeaderAction .icon,.mobileMenuClose .icon{width:21px;height:21px}
  #mobileMenuBtn{display:inline-flex}
  .mobileMenuOverlay{position:fixed;inset:0;z-index:100;display:flex;justify-content:flex-end;
    background:rgba(14,17,16,.58)}
  .mobileMenuOverlay[hidden]{display:none!important}
  .mobileMenuPanel{width:min(86vw,340px);height:100%;overflow-y:auto;background:var(--card);
    border-left:1px solid var(--edge);box-shadow:-14px 0 38px rgba(0,0,0,.2);
    padding:16px;display:flex;flex-direction:column;gap:16px}
  .mobileMenuHead{display:flex;align-items:center;justify-content:space-between;gap:12px;
    min-height:42px;font-family:'Archivo Black','IBM Plex Sans',sans-serif;font-size:20px;font-weight:700}
  .mobileMenuNav{display:flex;flex-direction:column;gap:6px}
  .mobileMenuLink{min-height:46px;padding:10px 13px;border:1px solid transparent;border-radius:11px;
    background:transparent;color:var(--text);font-size:15px;font-weight:600;text-align:left;cursor:pointer}
  .mobileMenuLink:hover{background:var(--accent-soft);color:var(--accent)}
  .mobileMenuLink.active{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent)}
  .mobileUsagePill{padding:13px 14px;border:1px solid var(--edge);border-radius:var(--radius-sm);
    background:var(--bg);color:var(--muted);font-size:13px;font-weight:600;line-height:1.45}
  .mobileUsagePill.pro{background:var(--accent-soft);border-color:var(--accent-line);color:var(--accent)}
  .mobileUsagePill .pillMeter{display:block;width:100%;height:6px;margin:9px 0 0;vertical-align:initial}
  .mobileUsagePill.pro .pillMeter{background:var(--accent-line)}
  .mobileMenuActions{display:grid;gap:9px;margin-top:auto;padding-top:4px}
  .mobileMenuActions .btn{min-height:46px}

  .shell{width:100%;max-width:100%;padding:18px 14px 60px}
  .dashTop{gap:12px}
  .dashTop>div:first-child{width:100%}
  .dashTopRight{width:100%;display:grid;grid-template-columns:max-content minmax(0,1fr);
    align-items:stretch;gap:10px}
  .streakPill,#inviteBtn{min-height:44px;white-space:normal;line-height:1.35}
  .streakPill{justify-content:center;padding:9px 12px}
  #inviteBtn{width:100%;padding:9px 12px;text-align:center}
  .dailyGoal{width:100%;padding:15px 16px;margin-top:16px}
  .dailyGoalHead{min-width:0}
  .dailyGoalHead>div,.dailyGoalHead span{min-width:0}
  #dueBanner{width:100%;padding:15px 16px}
  #dueBanner .dueText{overflow-wrap:anywhere}
  #dueReviewBtn{min-height:44px;flex:0 0 auto}
  .deckGrid,.modeGrid{grid-template-columns:minmax(0,1fr);gap:12px}
  .deckCard{width:100%;min-width:0}
  .deckCard h3{overflow-wrap:anywhere}
  .deckCard .meta{flex-wrap:wrap;row-gap:5px}
}

@media(max-width:400px){
  .dashTopRight{grid-template-columns:minmax(0,1fr)}
  .dailyGoalHead{flex-direction:column;align-items:flex-start;gap:6px}
  #dailyGoalStatus{white-space:normal;text-align:left}
  #dueBanner{flex-direction:column;align-items:stretch}
  #dueReviewBtn{width:100%!important}
}

/* PDF export */
#printSheet{display:none}
@media print{
  body>*:not(#printSheet){display:none!important}
  body{background:#fff!important}
  #printSheet{display:block;color:#000;font-family:Georgia,'Times New Roman',serif;padding:0 6px}
  #printSheet h1{font-size:22pt;margin-bottom:2pt;font-family:inherit}
  #printSheet h2{font-size:15pt;margin:16pt 0 6pt;font-family:inherit}
  #printSheet .printMeta{font-size:10pt;color:#555;margin-bottom:12pt}
  #printSheet .printCard{padding:7pt 0;border-bottom:.5pt solid #bbb;break-inside:avoid}
  #printSheet .printFront{font-weight:700;font-size:11.5pt;margin-bottom:2pt}
  #printSheet .printBack{font-size:11pt;color:#222}
}