:root{--abyss:#FAF9F6;--vessel:#FFFFFF;--shoal:#E4E2DC;--deep:#F2F1EC;--mist:#17181C;--reed:#4A4B50;--stone:#686A70;--water:#4FA3D1;--water-soft:#BFE0F0;--water-deep:#1F6288;--pebble:#4A4A4A;--pebble-dark:#2E2E2E;--accent:#2644A0;--accent-hover:#1F3A8E;--accent-press:#1A327C;--accent-wash:rgba(38,68,160,0.08);--accent-edge:rgba(38,68,160,0.24);--on-accent:#FFFFFF;--focus:#2644A0;--right:#17784A;--right-wash:rgba(23,120,74,0.09);--right-edge:rgba(23,120,74,0.28);--glint:rgba(255,255,255,0.65);--on-right:#FFFFFF;--coral:#B02A1C;--sky:#1F6288;--amber:#7A5410;--brand-red:#C0321F;--flame-base:#C0321F;--flame-mid:#E8843C;--flame-tip:#F3C05B;--on-coral:#FFFFFF;--on-ink:#FFFFFF;--coral-wash:rgba(176,42,28,0.07);--coral-edge:rgba(176,42,28,0.26);--amber-wash:rgba(122,84,16,0.07);--water-wash:rgba(79,163,209,0.12);--brand-red-wash:rgba(192,50,31,0.10);--ink-wash:rgba(23,24,28,0.05);--edge-hover:#CDCAC2;--edge-strong:rgba(38,68,160,0.50);--field:#FFFFFF;--field-edge:#D8D5CD;--chart-1:#3A8FBF;--chart-1-wash:rgba(58,143,191,0.16);--chart-1-soft:rgba(58,143,191,0.42);--chart-context:var(--stone);--chart-band:rgba(23,24,28,0.07);--chart-2:#D95926;--chart-3:#4A3AA7;--glass:rgba(250,249,246,0.86);--glass-strong:rgba(250,249,246,0.95);--scrim:rgba(18,20,28,0.38);--lime:var(--accent);--lime-wash:var(--accent-wash);--lime-edge:var(--accent-edge);--on-lime:var(--on-accent);--paper:var(--abyss);--desk:var(--deep);--ink:var(--mist);--soft:var(--reed);--faint:var(--stone);--rule:var(--shoal);--wrong:var(--coral);--flag:var(--amber);--info:var(--sky);--step--2:0.75rem;--step--1:0.8125rem;--step-0:0.9375rem;--step-1:1.0625rem;--step-2:clamp(1.25rem,1.1rem + 0.6vw,1.5rem);--step-3:clamp(1.5rem,1.25rem + 1.1vw,2rem);--step-4:clamp(1.9rem,1.4rem + 2.2vw,2.9rem);--step-5:clamp(2.4rem,1.5rem + 4vw,4.4rem);--step-6:clamp(3rem,1.4rem + 7vw,7rem);--ease-rise:cubic-bezier(.22,1,.36,1);--ease-snap:cubic-bezier(.34,1.56,.64,1);--dur-fast:140ms;--dur-mid:320ms;--dur-slow:620ms;--lift-1:0 1px 2px rgba(18,22,40,0.05),0 2px 10px rgba(18,22,40,0.04);--lift-2:0 6px 14px rgba(18,22,40,0.07),0 16px 36px rgba(18,22,40,0.07);--radius:12px;--radius-sm:8px;--gutter:clamp(1.25rem,4vw,3rem);--measure:68ch}:root[data-theme=dark]{--abyss:#131418;--vessel:#1A1C21;--shoal:#2D3038;--deep:#212329;--mist:#ECECEF;--reed:#C2C4CB;--stone:#999CA6;--water:#5FB3E0;--water-soft:#1E4A62;--water-deep:#7CC4EA;--pebble:#B8B4AA;--pebble-dark:#8E8A80;--accent:#93B1F8;--accent-hover:#AEC4FA;--accent-press:#7F9FEF;--accent-wash:rgba(147,177,248,0.12);--accent-edge:rgba(147,177,248,0.32);--on-accent:#0D1530;--focus:#93B1F8;--right:#6FD29B;--right-wash:rgba(111,210,155,0.12);--right-edge:rgba(111,210,155,0.32);--glint:rgba(255,255,255,0.16);--on-right:#07210F;--coral:#F08272;--sky:#7CC4EA;--amber:#E3B45C;--brand-red:#F26A55;--on-coral:#1A0907;--on-ink:#131418;--coral-wash:rgba(240,130,114,0.12);--coral-edge:rgba(240,130,114,0.34);--amber-wash:rgba(227,180,92,0.12);--water-wash:rgba(95,179,224,0.14);--brand-red-wash:rgba(242,106,85,0.14);--ink-wash:rgba(236,236,239,0.06);--edge-hover:#3E424C;--edge-strong:rgba(147,177,248,0.55);--field:#1E2026;--field-edge:#363A44;--chart-1:#3E98C8;--chart-1-wash:rgba(62,152,200,0.22);--chart-1-soft:rgba(62,152,200,0.50);--chart-band:rgba(236,236,239,0.10);--chart-2:#D95926;--chart-3:#765AD4;--glass:rgba(19,20,24,0.86);--glass-strong:rgba(19,20,24,0.94);--scrim:rgba(0,0,0,0.55);--lift-1:0 1px 2px rgba(0,0,0,0.35),0 2px 8px rgba(0,0,0,0.30);--lift-2:0 4px 12px rgba(0,0,0,0.45),0 12px 32px rgba(0,0,0,0.40);color-scheme:dark}:root{--corbie-ink:#1A1917;--corbie-ink-2:#36332E;--corbie-cap:#3D3A34;--corbie-paper:#FFFFFF;--corbie-pupil:#1A1917;--corbie-sheen:rgba(255,255,255,0.10);--corbie-lens:var(--water);--corbie-tassel:var(--water);--corbie-mouth:#8C2F22;--corbie-shadow:rgba(23,22,20,0.10);--corbie-edge:transparent}:root[data-theme=dark]{--corbie-ink:#0D0C0B;--corbie-ink-2:#2A2824;--corbie-cap:#312E29;--corbie-paper:#F2EFE8;--corbie-pupil:#0D0C0B;--corbie-sheen:rgba(255,255,255,0.12);--corbie-mouth:#A63A2B;--corbie-shadow:rgba(0,0,0,0.45);--corbie-edge:rgba(237,234,227,0.45)}:root{--chem-c:var(--mist);--chem-h:#5C5E64;--chem-o:#B8341F;--chem-n:#2B55C0;--chem-s:#806000;--chem-hal:#3A7516;--chem-p:#A64D00;--chem-x:#7446A8;--chem-ball-c:#4A4D55;--chem-ball-h:#FFFFFF;--chem-ball-h-edge:#A3A6AD;--chem-ball-o:#D9432C;--chem-ball-n:#3462D6;--chem-ball-s:#E3B321;--chem-ball-hal:#4F9B2B;--chem-ball-p:#E27B1B;--chem-ball-x:#8E62C9;--chem-stick:#9EA1A8;--chem-label-dark:#17181C;--chem-label-light:#FFFFFF;--chem-measure:var(--accent)}:root[data-theme=dark]{--chem-h:#A9ACB5;--chem-o:#FF8B76;--chem-n:#93B0FF;--chem-s:#E3C04E;--chem-hal:#90CF68;--chem-p:#F2A45C;--chem-x:#C5A8F4;--chem-ball-c:#80848F;--chem-ball-h:#E6E7EA;--chem-ball-h-edge:#6E727C;--chem-ball-o:#F0654D;--chem-ball-n:#5E88F2;--chem-ball-s:#E8C33C;--chem-ball-hal:#6DBF47;--chem-ball-p:#F09A4A;--chem-ball-x:#A983E1;--chem-stick:#686C77;--chem-label-dark:#131418;--chem-label-light:#FFFFFF}:root{--calc-c1:#2C4FCF;--calc-c2:#EB6A1C;--calc-c3:#942059;--calc-c4:#0E9CB8;--calc-c5:#7F6300;--calc-c6:#B65FFE;--calc-c7:#3A3F4B;--calc-panel:#FFFFFF;--calc-paper:#FDFCF8;--calc-grid-minor:rgba(58,96,150,0.075);--calc-grid-major:rgba(58,96,150,0.17);--calc-axis:#2A2D35;--calc-tick:#5E6168;--calc-rule:#ECEAE4;--calc-rule-strong:#D9D6CE;--calc-margin:rgba(176,42,28,0.32);--calc-row-focus:#F7F6F1;--calc-tray:#F4F3EE;--calc-key:#FFFFFF;--calc-key-edge:#DEDBD3;--calc-key-build:#EEF3FA;--calc-demo:rgba(79,163,209,0.55)}:root[data-theme=dark]{--calc-c1:#5263B5;--calc-c2:#C27F56;--calc-c3:#D3317C;--calc-c4:#3098B3;--calc-c5:#796610;--calc-c6:#956EFD;--calc-c7:#B8BCC6;--calc-panel:#1A1C21;--calc-paper:#15171C;--calc-grid-minor:rgba(147,177,248,0.065);--calc-grid-major:rgba(147,177,248,0.15);--calc-axis:#C9CCD6;--calc-tick:#9DA0AA;--calc-rule:#262930;--calc-rule-strong:#353943;--calc-margin:rgba(240,130,114,0.30);--calc-row-focus:#1F2127;--calc-tray:#16181C;--calc-key:#23262D;--calc-key-edge:#30343D;--calc-key-build:#1E2533;--calc-demo:rgba(95,179,224,0.55)}:root{--logo-tile:#FFFFFF;--logo-tile-edge:#E4E2DC;--logo-tile-ink:#17181C;--logo-tile-sub:#686A70;--logo-day-ground:#FAF9F6;--logo-night-ground:#131418;--logo-night-ink:#ECECEF}:root[data-theme=dark]{--logo-tile-edge:transparent}:root{--aq-night-top:#0A0E1D;--aq-night-low:#232B4C;--aq-dawn-top:#34457A;--aq-dawn-mid:#C77A8E;--aq-dawn-low:#F4B56C;--aq-dawn-rim:#FCE3A8;--aq-sun:#FFEBB0;--aq-sun-glow:#FFC36B;--aq-far-night:#1E2544;--aq-far-dawn:#7B6A93;--aq-near-night:#0D1020;--aq-near-dawn:#2B2441;--aq-light:#FFD27A;--aq-wood:#2A1D14;--aq-wood-hi:#4B3422;--aq-brass:#C9993E;--aq-brass-dk:#8A6521;--aq-glass:rgba(255,255,255,0.07);--aq-lamp:rgba(255,190,105,0.55);--aq-rim:rgba(255,196,120,0.60);--corbie-hair-silver:#CDD0D8;--corbie-hair-silver-hi:#F0F2F6;--corbie-hair-silver-lo:#8A8F9D;--corbie-plum:#6E2D55;--corbie-plum-hi:#924872;--corbie-plum-lo:#451A37;--corbie-violet:#A183B8;--corbie-robe:#231D3A;--corbie-robe-hi:#40395F;--corbie-gold:#D8AA4C;--corbie-blond:#DEC487;--corbie-blond-lo:#A98F52;--corbie-coat:#4F5B31;--corbie-coat-hi:#7E8E4D;--corbie-tunic:#2A2C33;--corbie-tunic-hi:#454852;--corbie-leather:#5C3B25}.sets-actions{display:flex;gap:10px;flex-wrap:wrap}.study-crumb{font-size:var(--step--1);margin-bottom:8px}.set-form-field{display:grid;gap:6px;min-width:0}.set-form-label{font-size:12px;text-transform:uppercase;letter-spacing:.09em;color:var(--stone)}.set-form-optional{text-transform:none;letter-spacing:0;color:var(--stone);font-weight:400}.set-form-row{display:grid;gap:16px;grid-template-columns:minmax(0,1fr) 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8px;color:var(--stone)}.set-card-vis-public{border-color:var(--water-deep);color:var(--water-deep)}.set-card-vis-unlisted{border-color:var(--pebble);color:var(--reed)}.sets-modal-scrim{position:fixed;inset:0;z-index:80;background:var(--scrim);display:grid;place-items:center;padding:var(--gutter);animation:fade-in .18s ease both}.sets-modal{max-width:460px;width:100%;animation:rise-in .26s var(--ease-rise) both}.btn-danger{background:var(--coral);border-color:var(--coral);color:var(--on-coral)}.btn-danger:hover{background:var(--coral);filter:brightness(.94)}.btn-danger-ghost{color:var(--coral);border-color:var(--shoal)}.btn-danger-ghost:hover{color:var(--coral);border-color:var(--coral)}.study-rail{position:relative;height:4px;border-radius:2px;background:var(--deep);overflow:hidden}.study-rail-fill{display:block;height:100%;background:var(--water);transition:width .42s var(--ease-rise)}.study-card{margin-top:26px;border:1px solid var(--shoal);border-radius:var(--radius);background:var(--vessel);padding:22px;display:grid;gap:18px;max-width:820px;box-shadow:var(--lift-1)}.study-card-meta{font-size:var(--step--2);color:var(--stone);text-transform:uppercase;letter-spacing:.08em}.study-choices{display:grid;gap:8px}.study-choice{display:grid;grid-template-columns:26px minmax(0,1fr);gap:12px;align-items:start;text-align:left;font:inherit;font-size:var(--step--1);color:var(--mist);background:var(--vessel);border:1px solid var(--shoal);border-radius:var(--radius);padding:12px 14px;cursor:pointer;transition:border-color .16s ease,background .16s ease,transform .16s var(--ease-snap)}.study-choice:hover:not(:disabled){border-color:var(--pebble)}.study-choice[aria-pressed=true]:not(:disabled){border-color:var(--accent);background:var(--accent-wash)}.study-choice[data-state=correct]{border-color:var(--right);background:var(--right-wash)}.study-choice[data-state=wrong]{border-color:var(--coral);background:var(--coral-wash);animation:shake .38s ease both}.study-choice[data-state=muted]{color:var(--stone)}.study-choice:disabled{cursor:default}.study-choice-label{font-weight:600;color:var(--stone)}.study-done{display:grid;gap:14px;justify-items:start;max-width:60ch;padding:44px 0}.study-done p{font-size:var(--step--1);color:var(--reed)}.study-stage{margin-top:26px;max-width:820px;display:grid;gap:18px}.flashcard-scene{position:relative;perspective:1800px;margin-bottom:12px}.flashcard-scene:after,.flashcard-scene:before{content:"";position:absolute;inset:0;z-index:0;pointer-events:none;border-radius:var(--radius);background:var(--vessel);border:1px solid var(--shoal);box-shadow:var(--lift-1);opacity:0;transform:translateY(7px) scale(.976);transition:opacity .32s ease,transform .42s var(--ease-rise)}.flashcard-scene:after{transform:translateY(14px) scale(.952)}.flashcard-scene[data-stack="1"]:before,.flashcard-scene[data-stack="2"]:before{opacity:1}.flashcard-scene[data-stack="2"]:after{opacity:.55}.flashcard{position:relative;z-index:1;display:block;width:100%;padding:0;border:none;background:none;font:inherit;text-align:inherit;color:inherit;cursor:pointer;border-radius:var(--radius);animation:flashcard-enter .44s var(--ease-rise) both}.flashcard[data-static]{cursor:default}.flashcard:focus-visible{outline:2px solid var(--focus);outline-offset:5px}.flashcard-leaving{position:absolute;inset:0;z-index:2;pointer-events:none;animation:flashcard-leave .38s var(--ease-rise) both}.flashcard-inner{display:grid;transform-style:preserve-3d;transition:transform .64s var(--ease-rise);min-height:clamp(240px,36vh,340px);will-change:transform}.flashcard[data-flipped=true] .flashcard-inner{transform:rotateY(180deg)}.flashcard-face{position:relative;grid-area:1/1;backface-visibility:hidden;-webkit-backface-visibility:hidden;display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:14px;padding:20px 26px 18px;border-radius:var(--radius);background:var(--vessel);border:1px solid var(--shoal);box-shadow:var(--lift-2);min-width:0;overflow-wrap:anywhere;transition:box-shadow .18s ease,border-color .18s ease}.flashcard:not([data-static]):hover .flashcard-face{border-color:var(--edge-hover)}.flashcard-front{background:linear-gradient(180deg,var(--vessel) 0,var(--vessel) 55%,var(--deep) 100%)}.flashcard-back{transform:rotateY(180deg)}.flashcard-back:before{content:"";position:absolute;top:-1px;left:22px;right:22px;height:3px;background:var(--accent);border-radius:0 0 3px 3px}.flashcard-label{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--stone)}.flashcard-star{color:var(--amber);font-size:14px;letter-spacing:0}.flashcard-verdict{letter-spacing:.06em;font-weight:700;padding:3px 9px;border-radius:999px}.flashcard-verdict[data-correct=true]{color:var(--right);background:var(--right-wash)}.flashcard-verdict[data-correct=false]{color:var(--coral);background:var(--coral-wash)}.flashcard-text{align-self:center;justify-self:center;text-align:center;max-width:34ch;font-family:var(--font-reading),Georgia,serif;font-size:var(--step-2);line-height:1.35;color:var(--mist)}.flashcard-text.is-long{justify-self:start;text-align:left;max-width:62ch;font-size:var(--step-1);line-height:1.5}.flashcard-hint{font-size:var(--step--2);color:var(--stone);text-align:center}.flashcard-hint .kbd{vertical-align:0}@keyframes flashcard-enter{0%{opacity:0;transform:translateX(40px) rotate(1.5deg) scale(.98)}to{opacity:1;transform:none}}@keyframes flashcard-leave{to{opacity:0;transform:translateX(-56px) translateY(-6px) rotate(-3deg) scale(.96)}}@media (max-width:560px){.flashcard-inner{min-height:clamp(220px,40vh,300px)}.flashcard-face{padding:16px 18px 14px}.flashcard-text{font-size:var(--step-1)}}@media (prefers-reduced-motion:reduce){.flashcard{animation:none}.flashcard-leaving{display:none}.flashcard-inner,.flashcard-scene:after,.flashcard-scene:before{transition:none}}.kbd{display:inline-block;font-family:ui-monospace,SF Mono,Menlo,monospace;font-size:10.5px;line-height:1;padding:3px 5px 2px;border:solid var(--shoal);border-width:1px 1px 2px;border-radius:4px;color:var(--stone);background:var(--vessel);vertical-align:1px}.btn-primary .kbd{background:color-mix(in srgb,var(--on-accent) 22%,transparent);color:inherit;border-color:transparent}.sets-ad{margin:48px 0 32px;max-width:820px;width:100%}@media (prefers-reduced-motion:reduce){.sets-modal,.sets-modal-scrim{animation:none}.study-choice,.study-rail-fill{transition:none}.study-choice[data-state=wrong]{animation:none}}.set-report-btn{color:var(--reed);gap:6px}.set-report-btn:hover{color:var(--coral);border-color:var(--coral-edge)}.pg{padding-bottom:104px}.pg-head{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;margin-top:44px}.pg-title{font-size:var(--step-4);font-weight:600;line-height:1.05}.pg-sub{margin-top:8px;color:var(--reed);font-size:var(--step-0)}.pg-facts{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px}.pg-fact{display:inline-flex;align-items:baseline;gap:8px;border:1px solid var(--shoal);border-radius:999px;padding:6px 12px;font-size:var(--step--1);background:var(--vessel)}.pg-fact-k{letter-spacing:.1em}.pg-fact-k,.pg-kicker{font-size:var(--step--2);text-transform:uppercase;color:var(--stone);font-weight:600}.pg-kicker{letter-spacing:.12em}.pg-h2{font-size:var(--step-2);font-weight:600;margin-top:6px;line-height:1.2}.pg-muted{color:var(--reed);font-size:var(--step--1);line-height:1.55}.pg-plus-note{margin-top:16px}.pg-grid{display:grid;gap:16px;margin-top:24px}.pg-grid-map,.pg-grid-top{grid-template-columns:minmax(0,3fr) minmax(0,2fr)}.pg-grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}.pg .card{min-width:0}.pg .card:hover{transform:none}.pg-score-line{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-top:10px}.pg-score-big{font-size:var(--step-5);font-weight:600;line-height:1;letter-spacing:-.02em}.pg-score-dash{color:var(--stone);margin:0 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