:root{
  /* Single confident accent — "study purple" — used for every primary
     action, active state, and highlight. Green is reserved ONLY for the
     semantic "correct / I know this" meaning. */
  --accent:#7c3aed; --accent-press:#6d28d9; --accent-soft:#f3eeff; --accent-line:#e5dbfb;
  --ring:rgba(124,58,237,.20);
  --bg:#faf9fe; --card:#ffffff; --edge:#ecebf3; --edge2:#dcd8ea;
  --text:#1b1726; --muted:#6b6880;
  --good:#059669; --good-soft:#e7f6ef; --good-line:#bfe8d6;
  --bad:#dc2626; --bad-soft:#fdecec; --bad-line:#f6cfcf;
  /* Supporting hues — one per activity, always paired with soft bg + line.
     Purple stays the brand; these keep sections from feeling monochrome. */
  --sun:#b45309; --sun-soft:#fdf3e3; --sun-line:#f3ddb0;      /* Match Up, warm bits */
  --teal:#0f766e; --teal-soft:#e6f7f4; --teal-line:#bde5de;   /* tests, Lightning Round */
  --sky:#0369a1; --sky-soft:#e8f4fb; --sky-line:#c3e2f4;      /* Star Defender */
  --coral:#be123c; --coral-soft:#fdecf0; --coral-line:#f7ccd7;/* rapid fire, Trivia Duel */
  --flame:#c2410c; --flame-soft:#fdefe6; --flame-line:#f6d3ba;/* study streak */
  --radius:16px; --radius-sm:12px; --radius-pill:999px;
  --shadow-sm:0 1px 2px rgba(28,18,60,.05);
  --shadow:0 8px 24px -18px rgba(50,30,110,.28);
  --shadow-lg:0 18px 42px -24px rgba(50,30,110,.35);
}
*{margin:0;padding:0;box-sizing:border-box}
body{color:var(--text);font-family:'Inter',system-ui,sans-serif;
  min-height:100vh;line-height:1.55;-webkit-font-smoothing:antialiased;
  background:radial-gradient(1000px 460px at 88% -140px, rgba(124,58,237,.06), transparent 62%),var(--bg);
  background-attachment:fixed}
h1,h2,h3,.logo{font-family:'Poppins','Inter',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);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}
.logo .icon{width:26px;height:26px;color:var(--accent)}
.logo span{color:var(--accent)}
.tagline{color:var(--muted);text-align:center;font-size:14.5px;margin:12px 0 24px;line-height:1.5}
.authTabs{display:flex;background:var(--bg);border-radius:var(--radius-sm);padding:4px;margin-bottom:20px}
.authTab{flex:1;border:none;background:transparent;border-radius:9px;padding:9px;font-size:14px;
  font-weight:600;color:var(--muted);cursor:pointer;transition:.18s}
.authTab.active{background:var(--card);color:var(--accent);box-shadow:var(--shadow-sm)}
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)}
.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(255,255,255,.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)}
.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;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:var(--radius-pill);padding:5px;width:max-content;margin-bottom:24px}
.navTab{display:inline-flex;align-items:center;gap:8px;border:none;background:transparent;
  border-radius:var(--radius-pill);padding:9px 18px;font-size:14px;font-weight:600;
  color:var(--muted);cursor:pointer;transition:.18s}
.navTab .icon{width:16px;height:16px}
.navTab.active{background:var(--accent-soft);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:#e9e9ff;font-size:15px;font-weight:600;text-align:center;
  margin-bottom:12px;line-height:1.45;min-height:1.4em}
.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}
#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}
.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}
.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}

/* ---------- Trivia Duel (solo) ---------- */
#tdTop{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;
  font-family:'Poppins',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}

/* ---------- 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:var(--radius-pill);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:12px;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:1px 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:12.5px}
.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}

/* ---------- dashboard ad banner (free tier only) ---------- */
.adBanner{position:relative;background:var(--card);border:1px solid var(--edge);border-radius:var(--radius);
  min-height:96px;margin-top:26px;display:flex;align-items:center;justify-content:center;padding:26px 16px 16px}
.adBanner .adLabel{position:absolute;top:8px;left:14px;font-size:10px;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.adBanner .adPlaceholder{color:var(--muted);font-size:13px;text-align:center}

/* ---------- 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:var(--radius-pill);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}
.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:var(--radius-pill)}
.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:var(--radius-pill);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}
.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)}
.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:'Poppins',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;margin-bottom:14px;
  font-family:'Poppins',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)}
.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:'Poppins',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:Poppins,Inter,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)}
#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:'Poppins',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}
}

/* Landing page */
.landingWrap{max-width:980px;margin:0 auto;min-height:calc(100vh - 64px);padding:48px 20px;
  display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center}
.landingIntro .logo{font-size:22px;margin-bottom:22px}
.landingHeadline{font-family:'Poppins',sans-serif;font-size:32px;font-weight:700;
  line-height:1.22;letter-spacing:-.015em;margin-bottom:14px}
.landingSub{color:var(--muted);font-size:15px;line-height:1.6;margin-bottom:30px;max-width:440px}
.stepsList{list-style:none;display:flex;flex-direction:column;gap:20px}
.stepsList li{display:flex;gap:14px;align-items:flex-start}
.stepsList .stepNum{flex:0 0 auto;width:30px;height:30px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;font-family:'Poppins',sans-serif;
  font-weight:700;font-size:13.5px;color:#fff;margin-top:1px}
.stepNum1{background:var(--accent)}
.stepNum2{background:var(--teal)}
.stepNum3{background:var(--coral)}
.stepsList div{display:flex;flex-direction:column;gap:2px}
.stepsList b{font-size:14.5px;font-weight:600}
.stepsList span{color:var(--muted);font-size:13px;line-height:1.5}
.landingWrap .authCard{width:auto;margin: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:16px 20px;border-top:1px solid var(--edge);font-size:13px}
.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:820px){
  .landingWrap{grid-template-columns:1fr;gap:34px;padding:32px 18px}
  .landingIntro{text-align:center}
  .landingIntro .logo{justify-content:center}
  .landingSub{margin-left:auto;margin-right:auto}
  .stepsList{text-align:left;max-width:400px;margin:0 auto}
}

/* 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:38px;height:4px;
  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:#9161f5; --accent-press:#a67bf7; --accent-soft:rgba(145,97,245,.16); --accent-line:rgba(145,97,245,.4);
  --ring:rgba(145,97,245,.35);
  --bg:#14121f; --card:#1e1b2e; --edge:#2c2840; --edge2:#3c3658;
  --text:#f1eefc; --muted:#a8a1c7;
  --good:#34d399; --good-soft:rgba(52,211,153,.14); --good-line:rgba(52,211,153,.4);
  --bad:#f87171; --bad-soft:rgba(248,113,113,.14); --bad-line:rgba(248,113,113,.4);
  --sun:#fbbf24; --sun-soft:rgba(251,191,36,.14); --sun-line:rgba(251,191,36,.4);
  --teal:#2dd4bf; --teal-soft:rgba(45,212,191,.14); --teal-line:rgba(45,212,191,.4);
  --sky:#38bdf8; --sky-soft:rgba(56,189,248,.14); --sky-line:rgba(56,189,248,.4);
  --coral:#fb7185; --coral-soft:rgba(251,113,133,.14); --coral-line:rgba(251,113,133,.4);
  --flame:#fb923c; --flame-soft:rgba(251,146,60,.14); --flame-line:rgba(251,146,60,.4);
  --shadow-sm:0 1px 2px rgba(0,0,0,.35);
  --shadow:0 1px 2px rgba(0,0,0,.35), 0 12px 30px -14px rgba(0,0,0,.55);
  --shadow-lg:0 24px 60px -20px rgba(0,0,0,.65);
}
: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:radial-gradient(1000px 460px at 88% -140px, rgba(145,97,245,.10), transparent 62%),var(--bg);
}
:root[data-theme="dark"] header.appBar{background:rgba(20,18,31,.96)}
:root[data-theme="dark"] .authTabs{background:var(--bg)}
: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(20,18,31,.97)}
: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:'Poppins',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:'Poppins',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{font-family:'Poppins',sans-serif;font-size:22px}
.tierDesc{color:var(--muted);font-size:14px;margin-top:-10px}
.tierPrice{font-family:'Poppins',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)}
.tierTag{position:absolute;top:-11px;right:22px;background:var(--accent);color:#fff;
  font-size:11px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  padding:4px 12px;border-radius:var(--radius-pill);max-width:calc(100% - 44px);text-align:center}

/* Deck folders */
.folderHead{grid-column:1/-1;display:flex;align-items:center;gap:8px;margin:14px 0 -4px;
  font-family:'Poppins',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:var(--radius-pill);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}

/* 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}
}