:root{--bg:oklch(18% .005 60);--bg-tint:oklch(22% .006 60);--paper:oklch(97% .004 85);--paper-edge:oklch(88% .008 80);--ink:oklch(18% .01 60);--ink-soft:oklch(45% .01 60);--gold:oklch(78% .13 85);--gold-hi:oklch(94% .09 92);--gold-lo:oklch(55% .1 75);--accent-too-easy:oklch(80% .12 145);--accent-correct:oklch(78% .1 210);--accent-hard:oklch(78% .11 55);--accent-wrong:oklch(72% .14 25);--ui:"Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;--ui-mono:"Geist Mono", ui-monospace, "SF Mono", Menlo, monospace;--ui-serif:"Newsreader", "Iowan Old Style", Georgia, serif;--card-w:340px;--card-h:520px;--tilt-max:10;--stack-count:0;--surface:oklch(21% .004 60);--surface-hover:oklch(24% .005 60);--surface-active:oklch(26% .006 60);--surface-raised:oklch(30% .005 60);--surface-sunken:oklch(18% .004 60);--text:oklch(82% .005 60);--text-strong:oklch(90% .005 60);--text-muted:oklch(65% .005 60);--text-dim:oklch(52% .005 60);--text-faint:oklch(44% .005 60);--border:oklch(100% 0 0/.06);--border-mid:oklch(100% 0 0/.1);--border-focus:oklch(100% 0 0/.22);--shadow-card:0 2px 4px oklch(0% 0 0/.4), 0 18px 40px -8px oklch(0% 0 0/.55), 0 40px 80px -20px oklch(0% 0 0/.5);--shadow-stack:0 20px 50px -15px oklch(0% 0 0/.5);--shadow-ui:0 2px 8px oklch(0% 0 0/.4);--shadow-thumb:0 1px 3px oklch(0% 0 0/.3);--heat-0:oklch(100% 0 0/.04);--heat-1:oklch(35% .06 210/.6);--heat-2:oklch(50% .09 210/.75);--heat-3:oklch(65% .1 210/.9);--heat-4:oklch(80% .11 210);--swatch-inactive:linear-gradient(145deg, oklch(40% .003 60), oklch(35% .003 60));--switch-thumb:oklch(95% .005 60)}@media (width>=769px) and (width<=1199px){:root{--card-w:520px;--card-h:720px;--tilt-max:9;--stack-count:3}}@media (width>=1200px){:root{--card-w:540px;--card-h:720px;--tilt-max:6;--stack-count:4}}[data-theme=light]{--bg:#f4f4f4;--bg-tint:#ebebeb;--surface:oklch(93% .004 60);--surface-hover:oklch(88% .005 60);--surface-active:oklch(84% .006 60);--surface-raised:oklch(80% .005 60);--surface-sunken:oklch(97% .004 60);--text:oklch(22% .005 60);--text-strong:oklch(10% .005 60);--text-muted:oklch(42% .005 60);--text-dim:oklch(52% .005 60);--text-faint:oklch(62% .005 60);--border:oklch(0% 0 0/.08);--border-mid:oklch(0% 0 0/.12);--border-focus:oklch(0% 0 0/.25);--gold:oklch(52% .13 85);--gold-lo:oklch(42% .1 75);--shadow-card:0 2px 4px oklch(0% 0 0/.1), 0 18px 40px -8px oklch(0% 0 0/.14), 0 40px 80px -20px oklch(0% 0 0/.12);--shadow-stack:0 20px 50px -15px oklch(0% 0 0/.12);--shadow-ui:0 2px 8px oklch(0% 0 0/.1);--shadow-thumb:0 1px 3px oklch(0% 0 0/.15);--heat-0:oklch(0% 0 0/.05);--heat-1:oklch(85% .05 210);--heat-2:oklch(73% .09 210);--heat-3:oklch(60% .11 210);--heat-4:oklch(48% .13 210);--swatch-inactive:linear-gradient(145deg, oklch(82% .003 60), oklch(76% .003 60));--switch-thumb:oklch(45% .005 60)}*,:before,:after{box-sizing:border-box}html,body{background:var(--bg);min-height:100dvh;color:var(--text);font-family:var(--ui);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;margin:0;padding:0;overflow:hidden}#app{flex-direction:column;height:100dvh;display:flex;overflow:hidden}.katex{color:var(--ink)!important}.fc-stage{background:radial-gradient(ellipse 80% 60% at 50% 40%, var(--bg-tint) 0%, var(--bg) 70%), var(--bg);color:var(--text);font-family:var(--ui);position:relative;overflow:hidden}.fc-stage:before{content:"";opacity:.55;mix-blend-mode:overlay;pointer-events:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 0.05 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");position:absolute;inset:0}.fc-card-scene{perspective:1600px;transform-style:preserve-3d;position:relative}.fc-card{transform-style:preserve-3d;-webkit-transform-style:preserve-3d;transform:rotateX(var(--rx,0deg)) rotateY(var(--ry,0deg));border-radius:4px;transition:transform .14s cubic-bezier(.2,.7,.2,1);position:relative}.fc-card-shadow{box-shadow:var(--shadow-card);pointer-events:none;z-index:-1;background:oklch(0% 0 0/.001);border-radius:4px;position:absolute;inset:0}.fc-card.is-flipping{transition:transform .7s cubic-bezier(.55,.05,.15,1)}.fc-card-face{border-radius:inherit;backface-visibility:hidden;box-sizing:border-box;background:linear-gradient(145deg,oklch(98.5% .004 85) 0%,oklch(95.5% .005 80) 100%);flex-direction:column;padding:36px 36px 32px;display:flex;position:absolute;inset:0;overflow:hidden;box-shadow:inset 0 1px oklch(100% 0 0/.9),inset 0 -1px oklch(0% 0 0/.06),inset 0 0 0 1px oklch(0% 0 0/.04)}.fc-card-face:before{content:"";border-radius:inherit;opacity:1;pointer-events:none;mix-blend-mode:multiply;z-index:0;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='250' height='250'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='0.75 0.65' numOctaves='4' seed='8' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.09  0 0 0 0 0.07  0 0 0 0 0.04  0 0 0 0.07 0'/></filter><rect width='100%' height='100%' filter='url(%23g)'/></svg>"),url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400'><filter id='f'><feTurbulence type='fractalNoise' baseFrequency='0.012 0.6' numOctaves='3' seed='22' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.07  0 0 0 0 0.05  0 0 0 0 0.02  0 0 0 0.05 0'/></filter><rect width='100%' height='100%' filter='url(%23f)'/></svg>");position:absolute;inset:0}.fc-card-face:after{content:"";border-radius:inherit;background:radial-gradient(ellipse 70% 55% at 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.18s,transform .22s cubic-bezier(.3,.7,.3,1),opacity .18s;position:absolute}.fc-hint svg{display:block}.fc-hint[data-dir=up]{top:20px;left:50%;transform:translate(-50%)}.fc-hint[data-dir=down]{bottom:20px;left:50%;transform:translate(-50%)}.fc-hint[data-dir=left]{top:50%;left:18px;transform:translateY(-50%)}.fc-hint[data-dir=right]{top:50%;right:18px;transform:translateY(-50%)}.fc-hint[data-dir=up].is-armed{color:var(--accent-too-easy);transform:translate(-50%)translateY(-6px)scale(1.15)}.fc-hint[data-dir=down].is-armed{color:var(--accent-hard);transform:translate(-50%)translateY(6px)scale(1.15)}.fc-hint[data-dir=left].is-armed{color:var(--accent-wrong);transform:translateY(-50%)translate(-6px)scale(1.15)}.fc-hint[data-dir=right].is-armed{color:var(--accent-correct);transform:translateY(-50%)translate(6px)scale(1.15)}.fc-stack-under{background:var(--paper);box-shadow:inset 0 1px 0 oklch(100% 0 0/.3), var(--shadow-stack);pointer-events:none;border-radius:4px;position:absolute;inset:0}.fc-stack-under:before{content:"";border-radius:inherit;opacity:.9;mix-blend-mode:multiply;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='250' height='250'><filter id='sg'><feTurbulence type='fractalNoise' baseFrequency='0.75 0.65' numOctaves='4' seed='8' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.09  0 0 0 0 0.07  0 0 0 0 0.04  0 0 0 0.06 0'/></filter><rect width='100%' height='100%' filter='url(%23sg)'/></svg>"),url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='400' height='400'><filter id='sf'><feTurbulence type='fractalNoise' baseFrequency='0.012 0.6' numOctaves='3' seed='22' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.07  0 0 0 0 0.05  0 0 0 0 0.02  0 0 0 0.04 0'/></filter><rect width='100%' height='100%' filter='url(%23sf)'/></svg>");position:absolute;inset:0}.fc-kicker{font-family:var(--ui);letter-spacing:.18em;text-transform:uppercase;color:oklch(45% .02 60);margin-bottom:14px;font-size:11px}.fc-term{font-family:var(--ui);letter-spacing:-.02em;color:var(--ink);font-weight:600;line-height:1.08}.fc-sub{font-family:var(--ui);color:var(--ink-soft);line-height:1.45}.fc-mono{font-family:var(--ui-mono);color:var(--ink);font-feature-settings:"liga" 0}.fc-math{font-size:1em}.fc-meta-row{font-family:var(--ui-mono);letter-spacing:.08em;color:oklch(55% .015 60);text-transform:uppercase;justify-content:space-between;align-items:baseline;margin-top:auto;font-size:10px;display:flex}pre.fc-code{font-family:var(--ui-mono);color:var(--ink);white-space:pre-wrap;word-break:break-all;background:oklch(95% .006 85);border-left:2px solid oklch(75% .06 25/.5);border-radius:2px;margin:12px 0 0;padding:14px 16px;font-size:13px;line-height:1.55;overflow:hidden}.tok-kw{color:oklch(45% .15 290);font-weight:500}.tok-fn{color:oklch(50% .14 240)}.tok-str{color:oklch(48% .12 145)}.tok-num{color:oklch(55% .14 55)}.tok-cm{color:oklch(55% .02 60);font-style:italic}.panel{background:var(--surface);border:1px solid var(--border);color:var(--text);font-family:var(--ui);border-radius:10px;flex-direction:column;gap:10px;min-width:0;padding:16px 18px;display:flex}.panel h3{letter-spacing:.14em;text-transform:uppercase;color:var(--text-dim);justify-content:space-between;align-items:baseline;margin:0;font-size:10px;font-weight:500;display:flex}.panel h3 em{font-style:normal;font-family:var(--ui-mono);letter-spacing:.06em;color:var(--text-dim);text-transform:none;font-size:10px}.heat{grid-template-columns:repeat(18,1fr);gap:3px;display:grid}.heat i{aspect-ratio:1;background:var(--heat-0);border-radius:2px}.heat i[data-l="1"]{background:var(--heat-1)}.heat i[data-l="2"]{background:var(--heat-2)}.heat i[data-l="3"]{background:var(--heat-3)}.heat i[data-l="4"]{background:var(--heat-4)}.upcoming{flex-direction:column;gap:2px;display:flex}.up-row{border-bottom:1px dashed var(--border);grid-template-columns:56px 1fr auto;align-items:baseline;gap:10px;padding:7px 0;font-size:12px;display:grid}.up-row:last-child{border-bottom:none}.up-row .when{font-family:var(--ui-mono);letter-spacing:.06em;color:var(--text-dim);text-transform:uppercase;font-size:10px}.up-row .what{color:var(--text-strong);text-overflow:ellipsis;white-space:nowrap;font-size:12.5px;overflow:hidden}.up-row .what small{font-family:var(--ui-mono);color:var(--text-dim);text-transform:uppercase;letter-spacing:.06em;margin-top:1px;font-size:10px;display:block}.up-row .stab{font-family:var(--ui-mono);color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:10px}.pill{font-family:var(--ui-mono);letter-spacing:.06em;text-transform:uppercase;background:var(--border);color:var(--text);border-radius:999px;align-items:center;gap:6px;padding:3px 8px;font-size:10px;display:inline-flex}.pill .dot{border-radius:3px;width:6px;height:6px}.deck-rail{flex-direction:column;gap:10px;display:flex}.deck-chip{background:var(--surface);border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:8px;align-items:center;gap:10px;padding:10px 12px;font-size:12px;transition:background .15s;display:flex}.deck-chip:hover{background:var(--surface-hover)}.deck-chip.active{background:var(--surface-active);border-color:var(--border-mid)}.deck-chip .sw{width:22px;height:30px;box-shadow:inset 0 1px 0 oklch(100% 0 0/.5), var(--shadow-ui);background:linear-gradient(145deg,oklch(97% .004 85),oklch(89% .008 80));border-radius:2px;flex-shrink:0}.deck-chip .meta{flex:1;min-width:0;overflow:hidden}.deck-chip .meta b{text-overflow:ellipsis;white-space:nowrap;color:var(--text-strong);font-weight:500;display:block;overflow:hidden}.deck-chip .meta small{font-family:var(--ui-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--text-dim);font-size:10px}.deck-chip .n{font-family:var(--ui-mono);color:var(--text-muted);font-variant-numeric:tabular-nums;font-size:11px}kbd.kk{font-family:var(--ui-mono);background:var(--border);border:1px solid var(--border-mid);color:var(--text-strong);border-radius:4px;justify-content:center;min-width:14px;padding:3px 7px;font-size:10px;line-height:1;display:inline-flex}.chrome-top{width:100%;color:var(--text-muted);font-family:var(--ui);justify-content:space-between;align-items:center;display:flex}.chrome-deck{letter-spacing:-.005em;font-size:13px;font-weight:500}.chrome-deck small{font-family:var(--ui-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--text-dim);margin-top:2px;font-size:10px;font-weight:400;display:block}.chrome-icon-btn{background:var(--border);width:36px;height:36px;color:var(--text);cursor:pointer;border:none;border-radius:18px;place-items:center;transition:background .15s;display:grid}.chrome-icon-btn:hover{background:var(--border-mid)}.progress-bar{background:var(--border);border-radius:1px;flex:1;height:2px;position:relative;overflow:hidden}.progress-bar:after{content:"";width:var(--progress,0%);background:var(--text);opacity:.55;transition:width .3s;position:absolute;inset:0}.sidebar{background:var(--surface);border-left:1px solid var(--border);color:var(--text);font-family:var(--ui)}.sidebar h3{letter-spacing:.16em;text-transform:uppercase;color:var(--text-dim);margin:0 0 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