@property --nfc-fill{syntax:"<percentage>";inherits:false;initial-value:0%}.nfc{grid-template-columns:minmax(0,1fr);gap:14px;display:grid;container:nfc/inline-size}.nfc-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;display:flex}.nfc-stats{flex-wrap:wrap;gap:6px;display:flex}.nfc-stat{border:1px solid var(--atp-bd2);background:var(--atp-card);min-height:36px;color:hsl(var(--muted-foreground));border-radius:999px;align-items:center;gap:6px;padding:0 12px 0 6px;font-size:13px;font-weight:700;display:inline-flex}.nfc-stat svg{color:#fff;border-radius:50%;width:24px;height:24px;padding:5px}.nfc-stat[data-tone=known] svg{background:linear-gradient(145deg,#34d399,#059669)}.nfc-stat[data-tone=again] svg{background:linear-gradient(145deg,#fb7185,#e11d48)}.nfc-stat[data-tone=left] svg{background:linear-gradient(145deg,#a78bfa,#7c3aed)}.nfc-stat b{min-width:1ch;color:hsl(var(--foreground));font-variant-numeric:tabular-nums;font-size:15px;font-weight:850;animation:.4s cubic-bezier(.34,1.56,.64,1) nfc-bump;display:inline-block}@keyframes nfc-bump{0%{transform:scale(1.5)}to{transform:scale(1)}}.nfc-tools,.nfc-done-keys{flex-wrap:wrap;gap:6px;display:flex}.nfc-tool{border:1px solid var(--atp-bd2);background:var(--atp-card);min-height:44px;color:hsl(var(--foreground));cursor:pointer;border-radius:12px;align-items:center;gap:6px;padding:0 12px;font-size:13.5px;font-weight:750;transition:border-color .15s,background-color .15s;display:inline-flex}.nfc-tool svg{width:16px;height:16px;color:hsl(var(--muted-foreground))}.nfc-tool:hover{border-color:color-mix(in srgb, #7c3aed 40%, var(--atp-bd2))}.nfc-tool[aria-pressed=true]{background:color-mix(in srgb, #8b5cf6 13%, var(--atp-card));border-color:#7c3aed}.nfc-tool[aria-pressed=true] svg{color:#7c3aed}.dark .nfc-tool[aria-pressed=true] svg{color:#c4b5fd}.nfc-strip{gap:3px;margin:0;padding:0;list-style:none;display:flex}.nfc-strip li{background:hsl(var(--muted));border-radius:999px;flex:1;min-width:3px;height:8px;transition:background-color .3s,transform .3s}.nfc-strip li[data-s=known]{background:linear-gradient(90deg,#34d399,#059669)}.nfc-strip li[data-s=again]{background:linear-gradient(90deg,#fb7185,#e11d48)}.nfc-strip li[data-s=current]{background:linear-gradient(90deg,#a78bfa,#7c3aed);transform:scaleY(1.5)}.nfc-stage{perspective:1400px;padding-bottom:28px;display:grid;position:relative}.nfc-stage>*{grid-area:1/1}.nfc-card,.nfc-under{--k1:#a78bfa;--k2:#7c3aed;--k3:#6d28d9}.nfc-card[data-kind=formula],.nfc-under[data-kind=formula]{--k1:#fbbf24;--k2:#d97706;--k3:#b45309}.nfc-under{z-index:1;pointer-events:none;transform-origin:50% 100%;transition:transform .45s cubic-bezier(.34,1.4,.64,1),opacity .3s;display:grid;position:relative}.nfc-under[data-depth="1"]{opacity:.85;transform:translateY(14px)scale(.95)}.nfc-under[data-depth="2"]{opacity:.55;transform:translateY(28px)scale(.9)}.nfc-under .nfc-face{filter:saturate(.7)}.nfc-under .nfc-face>*{visibility:hidden}.nfc-card{z-index:2;min-height:320px;color:hsl(var(--foreground));text-align:center;cursor:grab;touch-action:pan-y;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;transform-origin:50% 110%;transform:translateX(var(--dx,0)) rotate(var(--tilt,0));background:0 0;border:0;border-radius:24px;padding:0;transition:transform .5s cubic-bezier(.34,1.56,.64,1),opacity .3s;animation:.45s cubic-bezier(.2,.8,.2,1) nfc-rise;display:grid;position:relative}@keyframes nfc-rise{0%{opacity:.85;transform:translateY(14px)scale(.95)}to{opacity:1;transform:none}}.nfc-card[data-dragging]{cursor:grabbing;transition:none}.nfc-card[data-leave=knew]{opacity:0;transition:transform .3s cubic-bezier(.5,0,.75,0),opacity .3s ease-in;transform:translate(130%)rotate(16deg)}.nfc-card[data-leave=again]{opacity:0;transition:transform .3s cubic-bezier(.5,0,.75,0),opacity .3s ease-in;transform:translate(-130%)rotate(-16deg)}.nfc-card:focus-visible{outline:3px solid hsl(var(--ring));outline-offset:4px}.nfc-card-in{transform-style:preserve-3d;transition:transform .65s cubic-bezier(.3,1.35,.5,1);animation:.65s nfc-lift-back;display:grid;position:relative}.nfc-card[data-flipped] .nfc-card-in{animation:.65s nfc-lift;transform:rotateY(180deg)}@keyframes nfc-lift{50%{scale:1.045}}@keyframes nfc-lift-back{50%{scale:1.045}}.nfc-face{border:1px solid color-mix(in srgb, var(--k2) 30%, var(--atp-bd2));backface-visibility:hidden;min-height:320px;box-shadow:0 1px 0 var(--atp-bd), 0 26px 40px -26px color-mix(in srgb, var(--k3) 70%, transparent);border-radius:24px;grid-area:1/1;grid-template-rows:auto 1fr auto;gap:12px;padding:18px 20px;display:grid;overflow:hidden}.nfc-front{background:radial-gradient(120% 80% at 100% 0%, color-mix(in srgb, var(--k1) 30%, transparent), transparent 60%), linear-gradient(160deg, color-mix(in srgb, var(--k1) 16%, var(--atp-card)), var(--atp-card) 70%)}.nfc-back{background:linear-gradient(180deg, var(--k2) 0 4px, var(--atp-card) 4px);transform:rotateY(180deg)}.nfc-face-top{justify-content:space-between;align-items:center;gap:8px;display:flex}.nfc-kind{min-height:28px;color:var(--k3);background:color-mix(in srgb, var(--k1) 22%, var(--atp-card));border-radius:999px;align-items:center;gap:5px;padding:0 10px 0 8px;font-size:12.5px;font-weight:800;display:inline-flex}.dark .nfc-kind{color:color-mix(in srgb, var(--k1) 70%, #fff)}.nfc-kind svg{width:15px;height:15px}.nfc-n{color:hsl(var(--muted-foreground));font-variant-numeric:tabular-nums;font-size:12.5px;font-weight:750}.nfc-title{letter-spacing:-.01em;text-wrap:balance;overflow-wrap:anywhere;place-self:center;max-width:30ch;font-size:clamp(20px,1.2rem + 1.6cqi,30px);font-weight:850;line-height:1.25}.nfc-answer{place-self:center;width:100%;max-width:38rem;max-height:300px;font-size:15.5px;line-height:1.6;overflow:auto}.nfc-face-foot{color:hsl(var(--muted-foreground));justify-content:center;align-items:center;gap:6px;font-size:12.5px;font-weight:650;display:flex}.nfc-face-foot svg{flex:none;width:15px;height:15px}.nfc-sheen{z-index:3;pointer-events:none;opacity:0;mix-blend-mode:soft-light;background:linear-gradient(105deg,#0000 35%,#ffffff73 50%,#0000 65%) 0 0/260% 100%;border-radius:24px;position:absolute;inset:0}.nfc-card[data-flipped] .nfc-sheen{animation:.7s ease-out nfc-sheen}@keyframes nfc-sheen{0%{opacity:0;background-position:120% 0}40%{opacity:1}to{opacity:0;background-position:-20% 0}}.nfc-stamp{z-index:4;pointer-events:none;background:var(--atp-card);border:3px solid;border-radius:12px;align-items:center;gap:6px;padding:6px 12px;font-size:18px;font-weight:900;display:inline-flex;position:absolute;top:22px}.nfc-stamp svg{width:20px;height:20px}.nfc-stamp[data-side=knew]{color:#047857;border-color:#10b981;left:22px;transform:rotate(-12deg)}.nfc-stamp[data-side=again]{color:#be123c;border-color:#f43f5e;right:22px;transform:rotate(12deg)}.dark .nfc-stamp[data-side=knew]{color:#6ee7b7}.dark .nfc-stamp[data-side=again]{color:#fda4af}.nfc-keys{justify-content:center;align-items:center;gap:10px;display:flex}.nfc-nav{border:1px solid var(--atp-bd2);background:var(--atp-card);width:48px;height:48px;color:hsl(var(--foreground));cursor:pointer;border-radius:50%;flex:none;place-items:center;transition:transform .15s,border-color .15s;display:grid}.nfc-nav:hover:not(:disabled){border-color:color-mix(in srgb, #7c3aed 45%, var(--atp-bd2));transform:translateY(-1px)}.nfc-nav:disabled{opacity:.4;cursor:default}.nfc-nav svg{width:20px;height:20px}.nfc-turn,.nfc-again,.nfc-knew{cursor:pointer;border-radius:16px;justify-content:center;align-items:center;gap:8px;min-height:52px;padding:0 20px;font-size:15.5px;font-weight:850;transition:transform .15s,box-shadow .15s;display:inline-flex}.nfc-turn svg,.nfc-again svg,.nfc-knew svg{width:19px;height:19px}.nfc-turn{color:#fff;background:linear-gradient(150deg,#8b5cf6,#6d28d9);box-shadow:inset 0 1px #ffffff4d,0 4px #5b21b6,0 12px 20px -10px #6d28d9}.nfc-knew{color:#fff;background:linear-gradient(150deg,#34d399,#059669);box-shadow:inset 0 1px #ffffff4d,0 4px #047857,0 12px 20px -10px #059669}.nfc-again{color:#9f1239;background:color-mix(in srgb, #f43f5e 13%, var(--atp-card));box-shadow:inset 0 0 0 1px #f43f5e66,0 4px #e11d4859}.dark .nfc-again{color:#fecdd3}.nfc-turn:hover,.nfc-again:hover,.nfc-knew:hover{transform:translateY(-1px)}.nfc-turn:active,.nfc-again:active,.nfc-knew:active{box-shadow:none;transform:translateY(3px)}.nfc-nav:focus-visible,.nfc-turn:focus-visible,.nfc-again:focus-visible,.nfc-knew:focus-visible,.nfc-tool:focus-visible{outline:2px solid hsl(var(--ring));outline-offset:2px}.nfc-hint{color:hsl(var(--muted-foreground));flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;margin:0;font-size:12.5px;display:flex}.nfc-hint kbd{border:1px solid var(--atp-bd2);background:var(--atp-card);min-width:26px;min-height:24px;font:inherit;color:hsl(var(--foreground));border-bottom-width:2px;border-radius:7px;justify-content:center;align-items:center;padding:0 6px;font-size:12px;font-weight:800;display:inline-flex}.nfc-hint kbd svg{width:13px;height:13px}@media (hover:none){.nfc-hint{display:none}}@container nfc (max-width:440px){.nfc-face,.nfc-card{min-height:290px}.nfc-face{padding:14px 14px 16px}.nfc-keys{gap:6px}.nfc-again,.nfc-knew,.nfc-turn{white-space:nowrap;flex:1;padding:0 10px;font-size:14.5px}.nfc-head,.nfc-stats,.nfc-tools{grid-template-columns:repeat(3,minmax(0,1fr));width:100%;display:grid}.nfc-head{grid-template-columns:minmax(0,1fr)}.nfc-stat{text-align:center;border-radius:16px;flex-direction:column;justify-content:center;gap:2px;min-height:64px;padding:6px 4px;font-size:12px}.nfc-stat svg{width:22px;height:22px;padding:4px}.nfc-stat b{font-size:16px}.nfc-tool{text-align:center;flex-direction:column;justify-content:center;gap:3px;min-height:56px;padding:4px;font-size:12.5px}.nfc-nav{width:44px;height:44px}.nfc-again,.nfc-knew,.nfc-turn{min-width:0}}@container nfc (max-width:320px){.nfc-again svg,.nfc-knew svg,.nfc-turn svg{display:none}}.nfc-deck{align-items:center;gap:8px;min-width:0;margin:0;font-size:15px;font-weight:850;display:flex}.nfc-deck svg{color:#fff;background:linear-gradient(145deg,#a78bfa,#7c3aed);border-radius:10px;flex:none;width:30px;height:30px;padding:6px}.nfc-deck span{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.nfc-title .katex-display{margin:0}.nfc-rates{grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;display:grid}.nfc-rate{border:1px solid var(--atp-bd2);background:var(--atp-card);min-height:58px;color:hsl(var(--foreground));cursor:pointer;border-radius:16px;align-content:center;place-items:center;gap:2px;padding:6px 4px;font-size:15px;font-weight:850;transition:transform .15s,border-color .15s;display:grid}.nfc-rate small{color:hsl(var(--muted-foreground));font-variant-numeric:tabular-nums;font-size:12px;font-weight:700}.nfc-rate[data-rate=again]{border-color:color-mix(in srgb, #f43f5e 50%, var(--atp-bd2));background:color-mix(in srgb, #f43f5e 9%, var(--atp-card))}.nfc-rate[data-rate=hard]{border-color:color-mix(in srgb, #f59e0b 50%, var(--atp-bd2));background:color-mix(in srgb, #f59e0b 9%, var(--atp-card))}.nfc-rate[data-rate=good]{border-color:color-mix(in srgb, #10b981 50%, var(--atp-bd2));background:color-mix(in srgb, #10b981 10%, var(--atp-card))}.nfc-rate[data-rate=easy]{border-color:color-mix(in srgb, #3b82f6 50%, var(--atp-bd2));background:color-mix(in srgb, #3b82f6 9%, var(--atp-card))}.nfc-rate:hover{transform:translateY(-1px)}.nfc-rate:active{transform:translateY(2px)}.nfc-rate:focus-visible{outline:2px solid hsl(var(--ring));outline-offset:2px}@container nfc (max-width:320px){.nfc-rates{gap:5px}.nfc-rate{font-size:14px}}.nfc-done{border:1px solid var(--atp-bd2);background:radial-gradient(90% 70% at 50% 0%, #34d39929, transparent 70%), var(--atp-card);text-align:center;border-radius:24px;justify-items:center;gap:10px;padding:28px 16px;display:grid;position:relative;overflow:hidden}.nfc-score{--nfc-fill:var(--p);background:conic-gradient(#10b981 var(--nfc-fill), hsl(var(--muted)) 0);border-radius:50%;place-items:center;width:132px;height:132px;animation:1.1s cubic-bezier(.2,.8,.2,1) nfc-fill;display:grid}@keyframes nfc-fill{0%{--nfc-fill:0%}}.nfc-score>span{background:var(--atp-card);border-radius:50%;place-items:center;width:104px;height:104px;display:grid}.nfc-score b{font-variant-numeric:tabular-nums;font-size:28px;font-weight:900;line-height:1}.nfc-score small{color:hsl(var(--muted-foreground));font-size:12.5px;font-weight:700}.nfc-done-title{align-items:center;gap:8px;font-size:20px;font-weight:850;display:inline-flex}.nfc-done-title svg{color:#d97706;width:22px;height:22px}.nfc-done-line{max-width:34rem;color:hsl(var(--muted-foreground));font-size:14px}.nfc-done-keys{justify-content:center;margin-top:4px}.nfc-burst{pointer-events:none;width:0;height:0;position:absolute;top:94px;left:50%}.nfc-burst i{opacity:0;width:9px;height:9px;transform:rotate(var(--a)) translateY(0);background:#7c3aed;border-radius:3px;animation:1s cubic-bezier(.15,.7,.3,1) .15s nfc-burst;position:absolute}.nfc-burst i:nth-child(3n+1){background:#10b981}.nfc-burst i:nth-child(3n+2){background:#f59e0b;border-radius:50%}@keyframes nfc-burst{0%{opacity:1;transform:rotate(var(--a)) translateY(0) scale(1)}to{opacity:0;transform:rotate(var(--a)) translateY(-110px) scale(.4)}}@media (prefers-reduced-motion:reduce){.nfc-card,.nfc-card-in,.nfc-under,.nfc-strip li,.nfc-tool,.nfc-nav,.nfc-turn,.nfc-again,.nfc-knew,.nfc-rate{transition:none}.nfc-card,.nfc-card-in,.nfc-card[data-flipped] .nfc-card-in,.nfc-stat b,.nfc-score{animation:none}.nfc-sheen,.nfc-burst{display:none}.nfc-turn:hover,.nfc-again:hover,.nfc-knew:hover,.nfc-nav:hover:not(:disabled),.nfc-rate:hover,.nfc-rate:active{transform:none}}