.pd-scope{--pd-ink:#1d2327;--pd-paper:#f6f6f6;--pd-crimson:#c62828;--pd-crimson-deep:#8b1c1c;--pd-gold:#c9a441;--pd-gold-deep:#8a6d1f;--pd-gold-glow:rgba(201,164,65,.25);--pd-whisper:hsla(0,0%,96%,.55);--pd-whisper-faint:hsla(0,0%,96%,.25);--pd-green:#4a8b5e;--pd-red-soft:#d04545;position:fixed;inset:0;z-index:50;background:var(--pd-ink);background-image:radial-gradient(ellipse at top,rgba(198,40,40,.08),transparent 60%),radial-gradient(ellipse at bottom,rgba(201,164,65,.05),transparent 50%);color:var(--pd-paper);font-family:Inter,system-ui,sans-serif;-moz-user-select:none;user-select:none;-webkit-user-select:none;-webkit-tap-highlight-color:transparent;overflow:hidden;overscroll-behavior:none}.pd-scope *{box-sizing:border-box}.pd-scope button{font-family:inherit}.pd-app{height:100dvh;display:flex;flex-direction:column;max-width:480px;margin:0 auto;position:relative;padding:env(safe-area-inset-top) 0 env(safe-area-inset-bottom)}.pd-back-link{position:absolute;top:12px;left:12px;z-index:200;color:var(--pd-whisper);font-size:12px;text-decoration:none;font-family:JetBrains Mono,monospace;letter-spacing:.5px;text-transform:uppercase;background:rgba(0,0,0,.3);border:1px solid hsla(0,0%,96%,.1);padding:6px 10px;border-radius:6px}.pd-back-link:hover{color:var(--pd-paper)}.pd-scope header{display:flex;align-items:center;justify-content:space-between;padding:18px 22px 14px;border-bottom:1px solid hsla(0,0%,96%,.08)}.pd-brand{font-family:Cormorant Garamond,serif;font-size:22px;font-weight:500;letter-spacing:.5px}.pd-brand .dot{color:var(--pd-crimson)}.pd-stats{display:flex;gap:14px;font-family:JetBrains Mono,monospace;font-size:11px;letter-spacing:.5px;text-transform:uppercase}.pd-stat{display:flex;align-items:center;gap:5px;color:var(--pd-whisper)}.pd-stat-dot{width:7px;height:7px;border-radius:50%}.pd-stat-dot.active{background:var(--pd-crimson);box-shadow:0 0 8px rgba(198,40,40,.6)}.pd-stat-dot.gold{background:var(--pd-gold);box-shadow:0 0 8px var(--pd-gold-glow)}.pd-stat-dot.skip{background:var(--pd-whisper);box-shadow:0 0 6px hsla(0,0%,96%,.25)}.pd-stat-num{color:var(--pd-paper);font-weight:500}.pd-stage{flex:1;position:relative;display:flex;align-items:center;justify-content:center;padding:24px 22px;perspective:1500px}.pd-card-wrap{position:relative;width:100%;max-width:380px;aspect-ratio:5/7}.pd-scope .card{position:absolute;inset:0;border-radius:18px;cursor:grab;transition:transform .5s cubic-bezier(.2,.9,.3,1.05),opacity .3s;transform-style:preserve-3d}.pd-scope .card.dragging{transition:none;cursor:grabbing}.pd-scope .card.flipped{transform:rotateY(180deg)}.pd-scope .card.behind-1{transform:scale(.95) translateY(16px);opacity:.7;pointer-events:none}.pd-scope .card.behind-2{transform:scale(.9) translateY(32px);opacity:.4;pointer-events:none}.pd-scope .face{position:absolute;inset:0;border-radius:18px;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:linear-gradient(180deg,#fbfaf6,#f0ece0);color:var(--pd-ink);box-shadow:inset 0 1px 0 hsla(0,0%,100%,.6),0 30px 60px -20px rgba(0,0,0,.6),0 12px 24px -8px rgba(0,0,0,.4);padding:26px 24px 22px;display:flex;flex-direction:column;overflow:hidden}.pd-scope .face.back{transform:rotateY(180deg);background:linear-gradient(180deg,#2a2f35,#1d2327);color:var(--pd-paper)}.pd-scope .card.gold .face.front{background:linear-gradient(180deg,#f9f3df,#e8d99a);box-shadow:0 1px 0 hsla(0,0%,100%,.7) inset,0 0 0 1px var(--pd-gold-deep),0 30px 60px -20px rgba(138,109,31,.5),0 0 30px var(--pd-gold-glow)}.pd-scope .card.gold .face.back{background:linear-gradient(180deg,#2a2620,#1a1610);box-shadow:0 1px 0 rgba(201,164,65,.3) inset,0 0 0 1px var(--pd-gold-deep),0 30px 60px -20px rgba(0,0,0,.6)}.pd-scope .card-head{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:14px;padding-left:40px;padding-right:40px;min-height:32px}.pd-scope .card-tag{font-family:JetBrains Mono,monospace;font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:var(--pd-crimson);font-weight:500}.pd-scope .card.gold .face.front .card-tag{color:var(--pd-gold-deep)}.pd-scope .face.back .card-tag{color:var(--pd-gold)}.pd-scope .card-meta{font-family:JetBrains Mono,monospace;font-size:10px;color:rgba(29,35,39,.4);letter-spacing:.5px}.pd-scope .face.back .card-meta{color:hsla(0,0%,96%,.4)}.pd-scope .card-prompt{font-family:Cormorant Garamond,serif;font-size:26px;line-height:1.25;font-weight:500;color:var(--pd-ink);margin-bottom:18px}.pd-scope .face.front.text-only{justify-content:space-between}.pd-scope .face.front.text-only .card-prompt{flex:1;display:flex;align-items:center;justify-content:center;text-align:center;font-size:38px;line-height:1.2;font-weight:500;margin:0;padding:12px 4px;letter-spacing:-.3px}.pd-scope .face.front.text-only .card-prompt .accidental{font-size:1.05em;color:var(--pd-crimson);font-style:italic}.pd-scope .card.gold .face.front.text-only .card-prompt .accidental{color:var(--pd-gold-deep)}.pd-scope .card-visual{flex:1;display:flex;align-items:center;justify-content:center;margin-bottom:18px;min-height:0}.pd-scope .mini-keyboard{display:flex;position:relative;height:110px;width:100%;max-width:280px}.pd-scope .wkey{flex:1;background:#fff;border:1px solid #ccc;border-radius:0 0 4px 4px;position:relative}.pd-scope .wkey.lit{background:linear-gradient(180deg,#f5d873,#d4a72c);box-shadow:inset 0 0 14px rgba(212,167,44,.6)}.pd-scope .bkey{position:absolute;background:var(--pd-ink);width:7%;height:65%;top:0;border-radius:0 0 3px 3px;z-index:2}.pd-scope .bkey.lit{background:linear-gradient(180deg,#d4a72c,#8a6d1f);box-shadow:0 0 14px rgba(212,167,44,.7)}.pd-scope .answers{display:flex;flex-direction:column;gap:8px}.pd-scope .answer-btn{background:rgba(29,35,39,.04);border:1px solid rgba(29,35,39,.15);color:var(--pd-ink);padding:12px 14px;border-radius:10px;font-size:14px;font-weight:500;text-align:left;cursor:pointer;transition:all .15s;display:flex;align-items:center;gap:10px}.pd-scope .answer-btn:hover{background:rgba(29,35,39,.08)}.pd-scope .answer-btn:active{transform:scale(.98)}.pd-scope .answer-btn.correct{background:rgba(74,139,94,.15);border-color:var(--pd-green);color:var(--pd-green)}.pd-scope .answer-btn.wrong{background:rgba(208,69,69,.15);border-color:var(--pd-red-soft);color:var(--pd-red-soft)}.pd-scope .answer-key{font-family:JetBrains Mono,monospace;font-size:10px;width:18px;height:18px;border-radius:50%;background:var(--pd-ink);color:var(--pd-paper);display:flex;align-items:center;justify-content:center;flex-shrink:0}.pd-scope .card.gold .face.front .answer-key{background:var(--pd-gold-deep)}.pd-scope .binary-row{display:flex;gap:12px;margin-top:auto}.pd-scope .binary-btn{flex:1;padding:14px;border-radius:12px;border:1.5px solid;background:transparent;font-family:Cormorant Garamond,serif;font-size:20px;font-weight:500;cursor:pointer;transition:all .15s}.pd-scope .binary-btn.left{color:var(--pd-red-soft);border-color:var(--pd-red-soft)}.pd-scope .binary-btn.right{color:var(--pd-green);border-color:var(--pd-green)}.pd-scope .binary-btn:hover{transform:translateY(-1px)}.pd-scope .stamp{position:absolute;top:32px;padding:8px 18px;font-family:Cormorant Garamond,serif;font-style:italic;font-weight:600;font-size:28px;border:3px solid;border-radius:8px;opacity:0;transition:opacity .1s;pointer-events:none;letter-spacing:1px}.pd-scope .stamp.left{left:24px;color:var(--pd-red-soft);border-color:var(--pd-red-soft);transform:rotate(-12deg)}.pd-scope .stamp.right{right:24px;color:var(--pd-green);border-color:var(--pd-green);transform:rotate(12deg)}.pd-scope .card-feedback{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:rgba(29,35,39,.92);color:var(--pd-paper);border-radius:18px;opacity:0;pointer-events:none;transition:opacity .3s;flex-direction:column;gap:10px;padding:30px;text-align:center}.pd-scope .card-feedback.show{opacity:1;pointer-events:auto}.pd-scope .card-feedback .verdict{font-family:var(--font-outfit),"Outfit",system-ui,sans-serif;font-size:28px;font-style:normal;font-weight:700;letter-spacing:.5px}.pd-scope .card-feedback .verdict.correct{color:#7dd49a}.pd-scope .card-feedback .verdict.wrong{color:var(--pd-red-soft)}.pd-scope .card-feedback .explain{font-size:14px;line-height:1.5;color:var(--pd-whisper);max-width:280px}.pd-scope .rating-row{margin-top:18px;width:100%;max-width:240px;gap:12px;justify-content:center}.pd-scope .rating-btn{flex:1;min-height:52px;background:transparent;border:1.5px solid hsla(0,0%,96%,.25);color:var(--pd-paper);border-radius:10px;font-size:22px;font-weight:700;cursor:pointer;transition:all .15s;display:flex;align-items:center;justify-content:center;line-height:1}.pd-scope .rating-btn.yes{border-color:var(--pd-green);color:#7dd49a}.pd-scope .rating-btn.yes:hover{background:rgba(74,139,94,.18);transform:translateY(-1px)}.pd-scope .rating-btn.no{border-color:var(--pd-red-soft);color:var(--pd-red-soft)}.pd-scope .rating-btn.no:hover{background:rgba(208,69,69,.18);transform:translateY(-1px)}.pd-scope .bookmark-btn{position:absolute;top:12px;right:12px;width:32px;height:32px;border-radius:8px;border:1px solid rgba(29,35,39,.18);background:rgba(29,35,39,.04);color:rgba(29,35,39,.45);cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:5;transition:all .2s}.pd-scope .bookmark-btn.active,.pd-scope .bookmark-btn:hover{color:var(--pd-gold-deep);border-color:var(--pd-gold-deep)}.pd-scope .bookmark-btn.active{background:rgba(201,164,65,.18)}.pd-scope .face.back .bookmark-btn{border-color:hsla(0,0%,96%,.18);background:hsla(0,0%,96%,.05);color:hsla(0,0%,96%,.5)}.pd-scope .face.back .bookmark-btn.active,.pd-scope .face.back .bookmark-btn:hover{color:var(--pd-gold);border-color:var(--pd-gold);background:rgba(201,164,65,.18)}.pd-scope .card.gold .face.front .bookmark-btn{border-color:var(--pd-gold-deep);color:var(--pd-gold-deep)}.pd-scope .skip-btn{position:absolute;top:12px;left:12px;width:32px;height:32px;border-radius:8px;border:1px solid rgba(29,35,39,.18);background:rgba(29,35,39,.04);color:rgba(29,35,39,.45);cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:5;transition:all .2s}.pd-scope .skip-btn:hover{color:var(--pd-crimson);border-color:var(--pd-crimson);background:rgba(198,40,40,.08)}.pd-scope .card.gold .face.front .skip-btn{border-color:var(--pd-gold-deep);color:var(--pd-gold-deep)}.pd-scope .card.gold .face.front .skip-btn:hover{color:var(--pd-crimson);border-color:var(--pd-crimson);background:rgba(198,40,40,.08)}.pd-scope .flip-btn{position:absolute;top:14px;right:14px;width:32px;height:32px;border-radius:50%;border:1px solid rgba(29,35,39,.2);background:rgba(29,35,39,.04);color:var(--pd-ink);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:14px;z-index:5;transition:all .2s}.pd-scope .flip-btn:hover{background:var(--pd-ink);color:var(--pd-paper);transform:scale(1.05)}.pd-scope .face.back .flip-btn{border-color:hsla(0,0%,96%,.2);background:hsla(0,0%,96%,.06);color:var(--pd-paper)}.pd-scope .face.back .flip-btn:hover{background:var(--pd-gold);color:var(--pd-ink)}.pd-scope .card.gold .face.front .flip-btn{border-color:var(--pd-gold-deep);color:var(--pd-gold-deep)}.pd-scope .back-content{flex:1;display:flex;flex-direction:column;gap:16px;padding-top:4px;overflow-y:auto}.pd-scope .hint-block{background:hsla(0,0%,96%,.04);border:1px solid rgba(201,164,65,.25);border-radius:12px;padding:16px;position:relative}.pd-scope .hint-label{font-family:JetBrains Mono,monospace;font-size:9px;letter-spacing:2px;text-transform:uppercase;color:var(--pd-gold);margin-bottom:8px;display:flex;align-items:center;gap:6px}.pd-scope .hint-label:before{content:"";width:4px;height:4px;background:var(--pd-gold);border-radius:50%;box-shadow:0 0 6px var(--pd-gold)}.pd-scope .hint-text{font-family:Cormorant Garamond,serif;font-size:18px;line-height:1.4;font-style:italic;color:var(--pd-paper);transition:filter .3s}.pd-scope .hint-text strong{font-style:normal;color:var(--pd-gold);font-weight:600}.pd-scope .hint-locked .hint-text{filter:blur(6px);opacity:.5}.pd-scope .reveal-btn{background:transparent;border:1px solid var(--pd-gold);color:var(--pd-gold);padding:8px 14px;border-radius:100px;font-family:JetBrains Mono,monospace;font-size:10px;letter-spacing:1.5px;text-transform:uppercase;cursor:pointer;margin-top:12px;transition:all .15s}.pd-scope .reveal-btn:hover{background:var(--pd-gold);color:var(--pd-ink)}.pd-scope .mnemonic-block{background:rgba(198,40,40,.08);border:1px solid rgba(198,40,40,.3);border-radius:12px;padding:14px 16px}.pd-scope .mnemonic-label{font-family:JetBrains Mono,monospace;font-size:9px;letter-spacing:2px;text-transform:uppercase;color:var(--pd-crimson);margin-bottom:6px}.pd-scope .mnemonic-text{font-family:Cormorant Garamond,serif;font-size:16px;line-height:1.4;color:var(--pd-paper)}.pd-scope .concept-block{padding:4px}.pd-scope .concept-label{font-family:JetBrains Mono,monospace;font-size:9px;letter-spacing:2px;text-transform:uppercase;color:var(--pd-whisper);margin-bottom:8px}.pd-scope .concept-text{font-size:13px;line-height:1.55;color:hsla(0,0%,96%,.85)}.pd-scope .back-footer{margin-top:auto;padding-top:12px;font-family:JetBrains Mono,monospace;font-size:9px;letter-spacing:1.5px;text-transform:uppercase;color:var(--pd-whisper-faint)}.pd-scope .back-footer,.pd-scope footer{border-top:1px solid hsla(0,0%,96%,.08);display:flex;justify-content:space-between;align-items:center}.pd-scope footer{padding:14px 22px 20px}.pd-scope .swipe-hint{font-family:JetBrains Mono,monospace;font-size:10px;color:var(--pd-whisper-faint);letter-spacing:1px;text-transform:uppercase}.pd-scope .progress{flex:1;height:2px;background:hsla(0,0%,96%,.1);margin:0 14px;border-radius:2px;overflow:hidden}.pd-scope .progress-fill{height:100%;background:linear-gradient(90deg,var(--pd-crimson),var(--pd-gold));width:0;transition:width .5s}.pd-scope .overlay{position:absolute;inset:0;background:var(--pd-ink);background-image:radial-gradient(ellipse at top,rgba(198,40,40,.12),transparent 60%),radial-gradient(ellipse at bottom,rgba(201,164,65,.08),transparent 50%);z-index:100;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:40px 28px;text-align:center;transition:opacity .5s}.pd-scope .overlay.hide{opacity:0;pointer-events:none}.pd-scope .overlay-eyebrow{font-family:JetBrains Mono,monospace;font-size:11px;color:var(--pd-crimson);letter-spacing:3px;text-transform:uppercase;margin-bottom:18px}.pd-scope .overlay-title{font-family:Cormorant Garamond,serif;font-size:48px;line-height:1.05;font-weight:500;margin-bottom:16px;max-width:360px}.pd-scope .overlay-title em{color:var(--pd-crimson);font-style:italic}.pd-scope .overlay-sub{font-size:15px;line-height:1.6;color:var(--pd-whisper);max-width:320px;margin-bottom:36px}.pd-scope .overlay-btn{background:var(--pd-crimson);color:var(--pd-paper);padding:14px 32px;border:none;border-radius:100px;font-size:14px;font-weight:600;letter-spacing:1px;text-transform:uppercase;cursor:pointer;transition:all .2s;box-shadow:0 6px 20px rgba(198,40,40,.3)}.pd-scope .overlay-btn:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(198,40,40,.4)}.pd-scope .overlay-btn.gold{background:var(--pd-gold);color:var(--pd-ink);box-shadow:0 6px 20px var(--pd-gold-glow)}.pd-scope .session-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:32px;width:100%;max-width:360px}.pd-scope .session-stat{background:hsla(0,0%,96%,.04);border:1px solid hsla(0,0%,96%,.1);border-radius:12px;padding:16px 10px}.pd-scope .session-stat .num{font-family:Cormorant Garamond,serif;font-size:32px;font-weight:500}.pd-scope .session-stat .num.gold{color:var(--pd-gold)}.pd-scope .session-stat .num.crimson{color:var(--pd-crimson)}.pd-scope .session-stat .label{font-family:JetBrains Mono,monospace;font-size:9px;letter-spacing:1.5px;text-transform:uppercase;color:var(--pd-whisper);margin-top:4px}@keyframes pd-sparkle{0%,to{opacity:0;transform:scale(0)}50%{opacity:1;transform:scale(1)}}.pd-scope .sparkle{position:absolute;width:6px;height:6px;background:var(--pd-gold);border-radius:50%;box-shadow:0 0 10px var(--pd-gold);animation:pd-sparkle 1.2s ease-in-out;pointer-events:none;z-index:10}@keyframes pd-shake{0%,to{transform:translateX(0)}25%{transform:translateX(-8px)}75%{transform:translateX(8px)}}.pd-scope .shake{animation:pd-shake .4s}.pd-scope .face:after,.pd-scope .face:before{content:"";position:absolute;width:28px;height:28px;border:1px solid rgba(29,35,39,.15);pointer-events:none}.pd-scope .face:before{top:10px;left:10px;border-right:none;border-bottom:none}.pd-scope .face:after{bottom:10px;right:10px;border-left:none;border-top:none}.pd-scope .face.back:after,.pd-scope .face.back:before{border-color:rgba(201,164,65,.25)}.pd-scope .card.gold .face.front:after,.pd-scope .card.gold .face.front:before{border-color:var(--pd-gold-deep)}.pd-scope .breakdown-btn{background:transparent;border:1px solid hsla(0,0%,96%,.15);color:var(--pd-whisper);width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;margin-left:4px}.pd-scope .breakdown-btn:hover{border-color:var(--pd-gold);color:var(--pd-gold);background:rgba(201,164,65,.08)}.pd-scope .breakdown-overlay{justify-content:flex-start;padding:0;text-align:left;align-items:stretch}.pd-scope .breakdown-scroll{width:100%;max-width:480px;margin:0 auto;padding:60px 28px;overflow-y:auto;height:100%}.pd-scope .breakdown-header{margin-bottom:32px}.pd-scope .breakdown-title{font-family:Cormorant Garamond,serif;font-size:44px;line-height:1.05;font-weight:500;letter-spacing:-.5px}.pd-scope .breakdown-title em{color:var(--pd-gold);font-style:italic}.pd-scope .close-x{position:absolute;top:18px;right:22px;width:36px;height:36px;border-radius:50%;border:1px solid hsla(0,0%,96%,.15);background:transparent;color:var(--pd-paper);font-size:20px;cursor:pointer;z-index:10;display:flex;align-items:center;justify-content:center;transition:all .2s}.pd-scope .close-x:hover{background:var(--pd-crimson);border-color:var(--pd-crimson)}.pd-scope .weakest-callout{background:linear-gradient(135deg,rgba(198,40,40,.12),rgba(198,40,40,.04));border:1px solid rgba(198,40,40,.3);border-radius:16px;padding:20px 22px;margin-bottom:32px;position:relative;overflow:hidden}.pd-scope .weakest-callout:before{content:"";position:absolute;top:-20px;right:-20px;width:80px;height:80px;background:radial-gradient(circle,rgba(198,40,40,.3),transparent 70%);pointer-events:none}.pd-scope .weakest-eyebrow{font-family:JetBrains Mono,monospace;font-size:9px;letter-spacing:2px;text-transform:uppercase;color:var(--pd-crimson);margin-bottom:8px}.pd-scope .weakest-topic{font-family:Cormorant Garamond,serif;font-size:32px;font-weight:500;margin-bottom:4px}.pd-scope .weakest-detail{font-size:13px;color:var(--pd-whisper);line-height:1.5}.pd-scope .weakest-callout.all-strong{background:linear-gradient(135deg,rgba(201,164,65,.12),rgba(201,164,65,.04));border-color:rgba(201,164,65,.3)}.pd-scope .weakest-callout.all-strong:before{background:radial-gradient(circle,rgba(201,164,65,.3),transparent 70%)}.pd-scope .weakest-callout.all-strong .weakest-eyebrow{color:var(--pd-gold)}.pd-scope .drill-btn{margin-top:14px;background:var(--pd-crimson);color:var(--pd-paper);border:none;padding:10px 18px;border-radius:100px;font-size:12px;font-weight:600;letter-spacing:1px;text-transform:uppercase;cursor:pointer;box-shadow:0 4px 12px rgba(198,40,40,.3);transition:all .2s}.pd-scope .drill-btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(198,40,40,.4)}.pd-scope .weakest-callout.all-strong .drill-btn{background:var(--pd-gold);color:var(--pd-ink);box-shadow:0 4px 12px var(--pd-gold-glow)}.pd-scope .drill-banner{background:linear-gradient(90deg,rgba(198,40,40,.15),rgba(198,40,40,.04));border-bottom:1px solid rgba(198,40,40,.25);padding:8px 22px;display:flex;justify-content:space-between;align-items:center;font-family:JetBrains Mono,monospace;font-size:11px;letter-spacing:.5px;color:var(--pd-paper)}.pd-scope .drill-banner strong{color:var(--pd-crimson);font-weight:600;text-transform:uppercase;letter-spacing:1px}.pd-scope .drill-banner-dot{display:inline-block;width:6px;height:6px;background:var(--pd-crimson);border-radius:50%;margin-right:8px;box-shadow:0 0 6px var(--pd-crimson);animation:pd-pulse 1.5s ease-in-out infinite}@keyframes pd-pulse{0%,to{opacity:1}50%{opacity:.4}}.pd-scope .drill-banner button{background:transparent;border:1px solid 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