:root{--ink:#163039;--teal:#17766c;--paper:#f8faf8;--muted:#637477;--line:#dce6e2;--amber:#9b6a1a;--serif:Georgia,'Times New Roman',serif}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;font-size:15px;line-height:1.6}a{color:var(--teal)}button,input{font:inherit}button,a,input,label{touch-action:manipulation}a:focus-visible,button:focus-visible,.drop-zone:focus-within{outline:3px solid #2b8c82;outline-offset:5px}.nav{max-width:1200px;margin:auto;padding:25px 38px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-weight:650;color:var(--ink);font-size:20px;letter-spacing:-.6px}.brand-mark{width:36px;height:36px;border-radius:10px;background:var(--teal);color:white;display:grid;place-items:center;font:22px var(--serif);letter-spacing:-2px;padding-right:2px}.nav-note{font-size:12px;color:var(--muted)}.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--teal);margin-right:6px}.eyebrow{font-size:11px;font-weight:700;letter-spacing:2px;color:var(--teal);margin:0 0 18px}.hero{max-width:1124px;margin:55px auto 38px;padding:0 38px}.hero h1{font:clamp(42px,5.4vw,66px)/1.07 var(--serif);letter-spacing:-2px;margin:0 0 23px;font-weight:400}.hero h1 span{color:var(--teal)}.intro{color:var(--muted);font-size:16px;max-width:560px;line-height:1.8}.workspace{max-width:1124px;margin:auto;padding:0 38px;display:grid;grid-template-columns:1.3fr 1fr;gap:24px}h2{font-size:22px;font-weight:600;letter-spacing:-.65px;margin:18px 0 8px}h3{font-size:15px;margin:0 0 4px}.muted{color:var(--muted);margin:0;font-size:14px}.upload-card{border:1px solid var(--line);border-radius:18px;padding:30px;background:#fff;box-shadow:0 8px 24px #16303904}.section-label{display:flex;align-items:center;gap:9px;font-size:10px;letter-spacing:1.7px;color:var(--muted);font-weight:650}.step-number{padding:3px 7px;border:1px solid var(--line);border-radius:6px;letter-spacing:0;color:var(--teal)}.drop-zone{position:relative;display:flex;flex-direction:column;align-items:center;text-align:center;gap:8px;border:1.5px dashed #9dbeb4;border-radius:12px;margin:23px 0 16px;padding:30px 15px;color:var(--teal);background:#f5faf7;cursor:pointer;transition:.2s}.drop-zone:hover,.drop-zone.drag-over{background:#eaf5ef;border-color:var(--teal)}.drop-zone strong{font-size:16px;color:var(--ink)}.drop-zone span{font-size:12px;color:var(--muted)}.drop-zone input{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer}.privacy{display:flex;align-items:center;justify-content:center;gap:8px;font-size:11px;color:var(--muted);margin:0}.message{font-size:13px;margin:14px 0 0;color:var(--teal)}.message:empty{display:none}.message.error{color:#a03535}.try-sample{font-size:12px;color:var(--muted);margin:22px 0 0;border-top:1px solid var(--line);padding-top:18px}.try-sample a{text-underline-offset:3px}.how-card{border-radius:18px;background:#edf3ed;padding:34px}.how-card h2{font:31px var(--serif);margin:0 0 24px}.how-card ol{padding:0;margin:0;list-style:none;display:grid;gap:22px}.how-card li{display:flex;gap:14px}.how-card li>span{flex:0 0 27px;height:27px;display:grid;place-items:center;background:#ffffffa0;border:1px solid #d5e1d7;border-radius:50%;color:var(--teal);font-size:12px}.how-card li p{margin:0;color:var(--muted);font-size:13px}.supported{font-size:11px;border-top:1px solid #d4e0d7;padding-top:19px;margin-top:23px;color:var(--muted)}.results{max-width:1048px;margin:40px auto 0;background:white;border:1px solid var(--line);border-radius:18px;padding:30px}.results-heading{display:flex;justify-content:space-between;align-items:center;gap:16px}.results-heading h2{font:32px var(--serif);margin:0 0 8px}.results-heading .eyebrow{margin-bottom:10px}.secondary{border:1px solid var(--line);background:white;border-radius:8px;padding:10px 15px;color:var(--ink);cursor:pointer;font-size:12px}.secondary:hover{background:var(--paper)}.scoreboard{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;margin:25px 0;background:#f3f8f5;border-radius:12px;padding:25px}.score-main{border-right:1px solid var(--line)}.score-main>span{font:48px var(--serif);color:var(--teal)}.scoreboard p{margin:3px 0 0;font-size:12px;color:var(--muted)}.stat{padding-left:30px;align-self:center}.stat>span{font-size:32px;font-weight:500}.amber{background:var(--amber)}.grey{background:#9caaab}.feedback-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:28px 0 16px}.filters{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}.filters button{border:0;background:#fff;padding:7px 12px;font-size:12px;color:var(--muted);cursor:pointer}.filters button[aria-pressed=true]{background:#e7f2eb;color:var(--teal)}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px;text-align:left}th{font-size:10px;letter-spacing:.8px;text-transform:uppercase;color:var(--muted);padding:12px 14px;border-bottom:1px solid var(--line);white-space:nowrap}td{padding:14px;border-bottom:1px solid #edf1ef}td:first-child{font-weight:550;white-space:nowrap}.badge{display:inline-block;padding:3px 9px;border-radius:6px;font-size:11px;white-space:nowrap}.correct{background:#e9f5ec;color:#2b6e45}.incorrect,.invalid{background:#fff3dd;color:#8a5d13}.blank{background:#eff2f3;color:#627176}.results-note{font-size:11px;color:var(--muted);margin:18px 0 0}footer{max-width:1124px;margin:58px auto 0;padding:24px 38px 35px;border-top:1px solid var(--line);display:flex;align-items:center;gap:20px;color:var(--muted);font-size:11px}footer p{flex:1;margin:0}.brand-mini{font-size:14px;font-weight:650;color:var(--ink)}[hidden]{display:none!important}@media(max-width:740px){.nav{padding:20px}.nav-note{display:none}.hero{margin-top:38px;padding:0 22px}.hero h1{letter-spacing:-1.4px}.workspace{grid-template-columns:1fr;padding:0 20px}.upload-card,.how-card{padding:24px}.results{margin:28px 20px 0;padding:22px}.results-heading{align-items:start;flex-direction:column}.scoreboard{grid-template-columns:1fr 1fr;padding:20px;gap:20px}.score-main{border:0}.stat{padding:0}.feedback-heading{align-items:start;flex-direction:column}.filters button{padding:10px 14px}footer{padding:24px 22px;flex-wrap:wrap}footer>span:last-child{width:100%}th,td{padding:12px 8px}}

/* Practice Desk: shared worksheet colours, rounded shapes and clear reading contrast. */
:root{--ink:#27374b;--teal:#19766b;--paper:#fffcf5;--muted:#566579;--line:#e2e6e9;--serif:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}
body{background:radial-gradient(ellipse at 88% 16%,#f0edf9 0,transparent 35%),var(--paper)}
.brand{font-weight:800}.brand-mark{border-radius:12px;box-shadow:3px 3px 0 #c9e9dc;font:bold 20px system-ui;letter-spacing:-1px}.hero{position:relative;min-height:245px;padding-right:340px}.hero h1{font-weight:850;letter-spacing:-2.7px;line-height:1.13}.hero .intro{font-size:17px}.math-play{position:absolute;right:45px;top:28px;width:245px;height:215px}.math-tile{position:absolute;display:grid;place-items:center;width:96px;height:96px;border:2px solid #27374b;border-radius:25px;font-size:62px;font-weight:700;box-shadow:5px 6px 0 #27374b}.plus{left:0;top:0;transform:rotate(-12deg);background:#ccecdf;color:#19766b}.minus{right:0;top:12px;transform:rotate(9deg);background:#e3dcf8;color:#5550a0}.times{left:76px;top:93px;transform:rotate(-5deg);background:#ffe0b5;color:#a04d24}.math-caption{position:absolute;bottom:-20px;font-size:12px;color:var(--muted);width:100%;text-align:center}.upload-card,.how-card,.results{border-radius:24px}.upload-card{box-shadow:0 5px 0 #e5e9e4}.how-card{background:#f0edf9}.how-card h2,.results-heading h2{font-weight:750;font-size:29px;letter-spacing:-1px}.how-card li>span{background:white;color:#5550a0;border-color:#d7d0ea;font-weight:800}.drop-zone{border-radius:18px;background:#eff9f3}.step-number{background:#e3f3ea;border:0;font-weight:800}.scoreboard{background:#edf7f3}.score-main>span{font-weight:800}.supported{border-color:#d7d0ea}.secondary,.filters{border-radius:12px}
@media(max-width:900px){.hero{padding-right:270px}.math-play{right:35px;transform:scale(.8);transform-origin:top right}}
@media(max-width:740px){.hero{padding-right:22px;min-height:0}.hero h1{font-size:46px;letter-spacing:-2px}.math-play{position:relative;right:auto;top:auto;margin:30px 0 40px;transform:scale(.75);transform-origin:top left;height:155px}.hero .intro{font-size:16px}.math-caption{bottom:-22px}.nav{padding-bottom:22px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

.brand-logo{width:240px;height:80px;object-fit:contain}.footer-logo{width:150px;height:50px;object-fit:contain}.nav{padding-top:8px;padding-bottom:8px}@media(max-width:740px){.brand-logo{width:210px;height:70px}}

.worked-example{margin-top:12px;white-space:normal;min-width:205px;max-width:440px;font-weight:400;border-left:3px solid #19766b;padding:4px 0 4px 12px}.worked-example summary{color:#19766b;font-weight:650;cursor:pointer;white-space:normal;font-size:12px}.working-method{font-size:12px;font-weight:700;margin:10px 0 6px}.worked-example ol{padding-left:20px;margin:0;display:grid;gap:7px;font-size:12px;line-height:1.65}.worked-example summary:focus-visible{outline:3px solid #19766b;outline-offset:4px}td{vertical-align:top}@media(max-width:740px){.worked-example{min-width:190px;max-width:250px}}