:root{color-scheme:light;--bg:#f5f5ef;--ink:#223b35;--muted:#68756f;--green:#285b47;--green-dark:#1d4938;--line:#dedfd5;--soft:#e9ede2;--white:#fffefa;font-family:Arial,Helvetica,sans-serif;font-synthesis:none}
html{background:var(--bg)}*{box-sizing:border-box}[hidden]{display:none!important}body{margin:0;background:var(--bg);color:var(--ink)}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;cursor:pointer;touch-action:manipulation}button:disabled{cursor:default}button:focus-visible,a:focus-visible{outline:3px solid #b27225;outline-offset:5px}button:disabled:focus-visible{outline:none}svg{height:22px;width:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}.svg-defs{position:absolute;width:0;height:0;overflow:hidden}.page-shell{width:min(1100px,calc(100% - 80px));margin:auto}.site-header{height:106px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;align-items:center;gap:14px;color:var(--ink);text-decoration:none;font-size:18px;letter-spacing:-.35px;white-space:nowrap}.brand strong{font-weight:600}.brand-divider{color:#a3ada2;margin:0 9px}.brand-mark{display:grid;grid-template-columns:repeat(2,12px);gap:4px;transform:rotate(-5deg)}.brand-mark i{height:12px;border-radius:3px;background:var(--green)}.brand-mark i:nth-child(2){background:#a9bb84}.brand-mark i:nth-child(3){background:#c8d3b5}.fullscreen-button{background:transparent;border:1px solid #d5d9cd;border-radius:10px;color:var(--ink);display:flex;align-items:center;justify-content:center;gap:10px;min-height:46px;padding:10px 16px;font-size:14px;font-weight:600}.fullscreen-button:hover{background:#e9ecdf}.intro{padding:40px 0 30px;display:flex;justify-content:space-between;align-items:center;gap:30px}.eyebrow{margin:0 0 13px;color:#68795f;font-size:10px;font-weight:700;letter-spacing:2px}h1{font-size:42px;letter-spacing:-1.8px;font-weight:600;line-height:1.12;margin:0 0 13px}h1 span{color:#61744f}.intro-copy{font-size:16px;color:var(--muted);line-height:1.5;margin:0}.paper-note{display:flex;align-items:center;gap:13px;border-left:1px solid var(--line);padding-left:25px;flex-shrink:0;font-size:12px;line-height:1.65;color:var(--muted)}.paper-note svg{width:30px;height:30px;color:#7b8b69;stroke-width:1.4}.paper-note p{margin:0}.paper-note strong{font-weight:400;color:var(--ink)}.settings{padding:22px 26px;background:var(--white);border:1px solid var(--line);border-radius:16px;display:grid;grid-template-columns:1fr 1fr;gap:48px}.settings fieldset{padding:0;margin:0;border:0;min-width:0}.settings legend{font-size:14px;font-weight:600;margin:0 0 12px;padding:0;display:block}.settings legend span{font-size:12px;font-weight:400;color:var(--muted);margin-left:6px}.segmented{display:flex;background:#f1f2eb;border:1px solid #e7e9df;border-radius:10px;padding:4px;gap:4px}.segmented button{border:1px solid transparent;min-height:44px;flex:1;min-width:0;padding:8px 14px;background:transparent;color:#657263;border-radius:7px;font-size:15px;font-weight:500}.segmented button:hover{background:#e8ebde}.segmented button[aria-pressed=true]{background:var(--green);color:white;border-color:var(--green);box-shadow:0 2px 3px #203d3010}.segmented button:disabled{cursor:default;opacity:.5}.segmented button:disabled[aria-pressed=true]{opacity:.8}.time-options button{font-size:17px;font-weight:600;padding:8px}.exercise{margin-top:26px;padding:25px 28px 18px;border:1px solid var(--line);background:var(--white);border-radius:18px;box-shadow:0 5px 20px #283a2104}.exercise-topline{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 20px}h2{font-size:15px;font-weight:600;letter-spacing:.2px;margin:0}h2 span{color:#8c9980;margin-left:4px;font-variant-numeric:tabular-nums}.steps{list-style:none;display:flex;margin:0;padding:0;gap:24px}.steps li{display:flex;align-items:center;gap:7px;color:#7c857c;font-size:12px}.steps li>span{display:grid;place-items:center;width:22px;height:22px;background:#eff0e9;border-radius:50%;font-size:10px}.steps li.active{color:var(--green);font-weight:600}.steps li.active>span{background:var(--green);color:#fff}.pattern-stage{background:var(--soft);border:1px solid #e0e5d7;border-radius:13px;padding:20px 38px 0}.stage-label{display:flex;align-items:center;justify-content:center;gap:8px;margin-bottom:20px;font-size:13px;font-weight:500;min-height:18px;color:#53654a}.status-dot{height:6px;width:6px;background:#8c9d73;border-radius:50%}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;max-width:800px;margin:auto}.card{position:relative;display:flex;align-items:center;justify-content:center;aspect-ratio:1.16;background:#fffefa;border:1px solid #d4dbc9;border-radius:11px;box-shadow:0 4px 0 #d7decc;color:#263e33;user-select:none}.card-value{font-family:"Courier New",Courier,monospace;font-size:clamp(64px,7vw,102px);font-weight:700;line-height:1;margin-top:-12px;font-variant-numeric:tabular-nums}.card-position{position:absolute;bottom:10px;left:0;right:0;text-align:center;font-size:10px;color:#9aa28e;font-weight:600}.concealed{background:#eef1e6;border-style:dashed;box-shadow:none;border-color:#c6cfb9}.concealed .card-value{font-family:Arial,Helvetica,sans-serif;font-weight:400;font-size:56px;color:#a7b294}.concealed .card-position{color:#8a977a}.timer-area{height:64px;max-width:800px;margin:auto;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:10px}.timer-track{width:100%;height:4px;border-radius:4px;overflow:hidden;background:#cfd8c3}.timer-track[hidden]{display:none}.timer-track>div{height:100%;background:#4f7453;transform-origin:left;transform:scaleX(1)}#timer-text{margin:0;font-size:12px;line-height:1.4;color:#647255;min-height:17px;text-align:center}#timer-text strong{font-weight:600}.pattern-stage[data-phase=viewing] .status-dot{background:#3f6d48}.pattern-stage[data-phase=won]{background:#e6ede6;border-color:#dbe4db}.pattern-stage[data-phase=won] .stage-label{color:#315e45}.exercise-actions{display:grid;grid-template-columns:1.1fr 1fr;gap:12px;max-width:800px;margin:24px auto 0}.button{display:flex;align-items:center;justify-content:center;gap:10px;min-height:56px;padding:14px 18px;font-size:16px;font-weight:600;border-radius:10px;border:1px solid #d9ddcf;white-space:nowrap}.primary{color:#fff;background:var(--green);border-color:var(--green);box-shadow:0 3px 0 #1f4738}.primary:hover{background:var(--green-dark)}.primary:active{box-shadow:none;transform:translateY(1px)}.primary:disabled{background:#6f826a;border-color:#6f826a;box-shadow:none}.secondary{background:#f2f3eb;color:var(--ink)}.secondary:hover{background:#e7ebdc}.solution{background:var(--white);color:var(--green)}.solution:hover:not(:disabled){background:#edf1e8}.solution:disabled{background:#f8f8f3;color:#9ba294;border-color:#e8eadf}.exercise-help{font-size:12px;line-height:1.5;color:var(--muted);text-align:center;min-height:18px;margin:18px 0 0}.site-footer{display:flex;justify-content:space-between;align-items:center;padding:23px 2px 30px;font-size:11px;color:#7d8773;gap:20px}.reading-direction{display:flex;align-items:center;gap:9px}.reading-direction svg{height:17px;width:17px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}body:fullscreen{background:var(--bg);min-height:100vh;overflow-y:auto}body:fullscreen::backdrop{background:var(--bg)}body:fullscreen .page-shell{max-width:1250px}body:fullscreen .card-value{font-size:clamp(70px,9vw,128px)}
@media(min-width:1500px){.page-shell{width:min(1180px,calc(100% - 100px))}.intro{padding-top:48px;padding-bottom:36px}.exercise{margin-top:30px}.cards{max-width:850px}.pattern-stage{padding-top:24px}.timer-area{height:72px}.exercise-actions{max-width:850px}}
@media(max-width:1000px){.page-shell{width:calc(100% - 48px)}.site-header{height:88px}.intro{padding:32px 0 26px}h1{font-size:36px;letter-spacing:-1.3px}.paper-note{display:none}.settings{gap:24px;padding:22px}.exercise{padding:22px;margin-top:22px}.pattern-stage{padding:20px 22px 0}.cards{gap:12px}.card-value{font-size:clamp(64px,10vw,100px)}.button{font-size:15px;padding:14px 10px;gap:8px}.steps{gap:17px}}
@media(max-width:620px){.page-shell{width:calc(100% - 28px)}.site-header{height:78px}.brand{font-size:15px;gap:10px}.brand-divider{margin:0 5px}.fullscreen-button{padding:10px;min-width:44px}.fullscreen-button span{display:none}.intro{padding:28px 0 22px}.eyebrow{font-size:9px;letter-spacing:1.3px}h1{font-size:32px;letter-spacing:-1.2px}.intro-copy{font-size:14px;max-width:290px}.settings{grid-template-columns:1fr;gap:19px;padding:20px}.settings legend{margin-bottom:9px}.segmented button{min-height:44px}.exercise{padding:19px 14px 16px;margin-top:18px}.exercise-topline{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:18px}.steps{width:100%;justify-content:space-between;gap:10px}.pattern-stage{padding:18px 12px 0}.cards{gap:8px}.card{aspect-ratio:.76;border-radius:8px;box-shadow:0 3px 0 #d7decc}.concealed{box-shadow:none}.card-value{font-size:clamp(36px,10vw,62px)}.concealed .card-value{font-size:38px}.card-position{bottom:9px}.stage-label{font-size:12px;margin-bottom:16px}.timer-area{height:64px}.exercise-actions{grid-template-columns:1fr 1fr;gap:10px;margin-top:18px}.button{font-size:14px;min-height:54px}.primary{grid-column:1/-1}.exercise-help{font-size:11px;min-height:33px;margin-top:16px}.site-footer{padding:20px 2px 26px;font-size:10px;gap:10px}.reading-direction{gap:5px}.reading-direction svg{height:15px;width:15px}}
@media(min-width:621px) and (max-height:820px){.site-header{height:70px}.intro{padding:22px 0 19px}.eyebrow{margin-bottom:10px}h1{font-size:34px;margin-bottom:10px}.settings{padding:15px 22px}.settings legend{margin-bottom:9px}.exercise{margin-top:18px;padding:19px 22px 14px}.exercise-topline{margin-bottom:15px}.pattern-stage{padding:15px 24px 0}.stage-label{margin-bottom:13px}.cards{max-width:660px}.card{aspect-ratio:1.55}.card-value{font-size:65px}.concealed .card-value{font-size:44px}.timer-area{height:53px}.exercise-actions{margin-top:18px;max-width:760px}.exercise-help{margin-top:13px}.site-footer{padding:18px 2px 22px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
.card{padding:0;font:inherit}.card:disabled{opacity:1;cursor:default}.answer-slot{touch-action:none;cursor:pointer}.answer-slot.concealed .card-value{font-weight:300;color:#93a27e;font-size:46px}.answer-slot.can-place{border:2px dashed #63854b}.answer-slot:hover{border-color:#6b8655}.answer-slot.drag-over{background:#dae8cd;border:3px solid #547b3f;box-shadow:0 0 0 4px #698a5020}.card.correct{border:2px solid #3b8257;background:#f2faf1}.card.incorrect{border:2px solid #a6772c;background:#fff9ec}.card.correct:after,.card.incorrect:after{position:absolute;right:10px;top:8px;font:700 17px Arial,sans-serif}.card.correct:after{content:'✓';color:#2b7543}.card.incorrect:after{content:'!';color:#8d641d}.bank-area{max-width:800px;margin:17px auto 0}.bank-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:10px}.bank-heading h3{font-size:13px;margin:0;font-weight:600}.repeat-button{display:flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:8px 12px;background:#f3f5ec;border:1px solid #d9dfce;border-radius:8px;color:var(--green);font-size:12px;font-weight:600}.repeat-button svg{width:18px;height:18px}.repeat-button:hover{background:#e7eddd}.token-bank{display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:10px}.token{position:relative;border:1px solid #c8d3ba;background:#fffefa;color:#263e33;border-radius:9px;min-height:64px;padding:8px;font:700 36px/1 'Courier New',monospace;box-shadow:0 3px 0 #dee4d4;touch-action:none;user-select:none;cursor:grab;-webkit-user-select:none}.token:hover{background:#f0f4e7;border-color:#758c5c}.token.selected{outline:3px solid #4d7441;outline-offset:2px;background:#e6eedb}.token.used{color:#a7af9c;background:#f2f3ed;box-shadow:none;border-style:dashed;opacity:.45;cursor:default}.bank-help{font-size:11px;line-height:1.5;color:#737f68;margin:13px 0 0;text-align:center}.exercise-help.success{background:#e9f3e4;color:#2d663c;font-size:14px;font-weight:600;border-radius:8px;padding:12px;margin-bottom:1px}.exercise-help.try-again{background:#fbf2df;color:#78551e;font-size:14px;font-weight:600;border-radius:8px;padding:12px}.drag-ghost{position:fixed;z-index:10000;pointer-events:none;transform:translate(-50%,-50%) rotate(-5deg);display:grid;place-items:center;width:76px;height:76px;background:#fffefa;border:2px solid #547b3f;border-radius:10px;color:#263e33;font:700 43px 'Courier New',monospace;box-shadow:0 8px 20px #253d3430}.pattern-stage[data-phase=recall] .timer-area{height:44px}.exercise{scroll-margin-top:16px}.primary:disabled{opacity:.75}
@media(max-width:1000px){.bank-area{max-width:none}.token-bank{gap:9px}.token{min-height:62px;font-size:34px}}
@media(max-width:620px){.token-bank{grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.token{min-height:52px;font-size:30px}.bank-help{font-size:10px;max-width:260px;margin:13px auto 0}.answer-slot.concealed .card-value{font-size:34px}.exercise-help.success,.exercise-help.try-again{font-size:12px}.card.correct:after,.card.incorrect:after{font-size:12px;right:6px;top:5px}.bank-area{margin-top:12px}.repeat-button{font-size:11px;padding:8px}.bank-heading h3{font-size:12px}}
@media(min-width:621px) and (max-height:820px){.bank-area{margin-top:10px;max-width:760px}.bank-heading{margin-bottom:8px}.token{min-height:54px;font-size:30px}.bank-help{margin-top:9px}.pattern-stage[data-phase=recall] .timer-area{height:36px}.exercise-actions{margin-top:15px}.exercise-help.success,.exercise-help.try-again{padding:9px}}
.exercise-topline{gap:20px}.round-heading{margin-right:auto}.round-heading p{font-size:11px;color:var(--muted);margin:6px 0 0}.score-readout{display:flex;align-items:center;gap:8px;white-space:nowrap;border:1px solid #d5ddc2;border-radius:10px;padding:10px 15px;background:#edf2df;color:#38562e}.score-readout svg{color:#6d884a;width:22px;height:22px}.score-readout strong{font-size:28px;line-height:1;font-variant-numeric:tabular-nums;letter-spacing:-1px}.score-readout span{font-size:12px}.reset-button{padding:10px 13px;min-height:44px;background:#f5f5ef;border:1px solid #dedfd5;border-radius:9px;color:#5d6f53;font-size:12px}.reset-button:hover{background:#e9eede}.round-summary{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:0 0 17px}.round-reward{font-size:12px;color:#627252;white-space:nowrap}.exercise-actions{max-width:640px}.round-won .exercise-actions{grid-template-columns:1fr}.round-won .card-value{color:#275b3b}.round-won .card-position{color:#758c6e}.round-won .pattern-stage{background:#e7eee3}.site-footer{line-height:1.5}dialog{max-width:440px;width:calc(100% - 36px);padding:28px;background:var(--white);color:var(--ink);border:1px solid var(--line);border-radius:16px;box-shadow:0 20px 80px #15362430}dialog::backdrop{background:#233b3560}dialog h2{font-size:22px;margin:0 0 12px}dialog p{font-size:15px;line-height:1.6;margin:0 0 23px;color:var(--muted)}.dialog-actions{display:grid;grid-template-columns:1fr 1fr;gap:12px}.dialog-actions .button{font-size:14px;padding:12px}
@media(max-width:620px){.exercise-topline{display:grid;grid-template-columns:1fr auto;gap:13px}.reset-button{grid-column:1/-1;width:100%;font-size:12px;min-height:44px}.score-readout{padding:9px 12px;gap:6px}.score-readout strong{font-size:26px}.score-readout svg{width:19px;height:19px}.round-summary{align-items:flex-start;flex-direction:column;gap:14px;margin-bottom:17px}.round-reward{font-size:11px}.exercise-actions{grid-template-columns:1fr}.primary{grid-column:auto}.site-footer{align-items:flex-start}.site-footer>span:first-child{max-width:190px}}
@media(min-width:621px) and (max-height:820px){.exercise-topline{margin-bottom:15px}.round-summary{margin-bottom:13px}.score-readout{padding:8px 13px}.score-readout strong{font-size:26px}}