.pta-app{--blue:#174ea6;max-width:960px;background:#fff;border:1px solid #d8e2ef;border-radius:18px;padding:clamp(18px,3vw,36px);color:#19304b;font:16px/1.65 system-ui,sans-serif}.pta-app *{box-sizing:border-box}.pta-app h2{font-size:clamp(23px,3vw,32px);line-height:1.25}.pta-app button{background:#edf3fc;border:1px solid #bccde5;border-radius:9px;color:#183c70;padding:10px 16px;font:600 14px/1.5 system-ui;cursor:pointer;min-height:44px}.pta-app button:hover,.pta-app button:focus-visible{background:#dceaff;color:#11376e;border-color:#174ea6}.pta-app button:focus-visible,.pta-app input:focus-visible{outline:3px solid #f3ba42;outline-offset:2px}.pta-app button:disabled{opacity:.5;cursor:default}.pta-app .pta-primary,.pta-app .current{background:#174ea6!important;color:#fff!important}.pta-eyebrow{font-size:12px;font-weight:800;color:#174ea6;letter-spacing:.1em}.pta-head{display:flex;justify-content:space-between;background:#eef4fc;padding:12px 16px;border-radius:10px}.pta-clock{font-variant-numeric:tabular-nums;font-weight:800}.pta-app fieldset{border:0;min-width:0;margin:20px 0;padding:0}.pta-app legend{float:none;width:auto;font-size:19px;font-weight:650;line-height:1.5;padding:8px 0}.pta-options{display:grid;gap:10px;margin:20px 0}.pta-visual-options{grid-template-columns:repeat(4,minmax(0,1fr))}.pta-app .pta-option{display:flex;align-items:center;gap:10px;margin:0;padding:14px;border:2px solid #dde5ef;border-radius:12px;cursor:pointer;background:#fff;color:#19304b}.pta-option:hover{background:#eff5ff;color:#19304b}.pta-option:has(input:checked){border-color:#174ea6;background:#edf4ff}.pta-option input{accent-color:#174ea6;width:19px;height:19px;flex-shrink:0}.pta-visual-options .pta-option{flex-wrap:wrap}.pta-visual-options .pta-diagram{width:100%;height:105px}.pta-diagram{display:block;max-width:100%;max-height:320px;width:auto;margin:12px auto;object-fit:contain}.pta-controls{display:flex;gap:8px;flex-wrap:wrap}.pta-nav{display:flex;gap:7px;flex-wrap:wrap;margin:24px 0}.pta-nav button{min-width:42px;padding:7px}.pta-nav .answered{border-bottom:5px solid #2b758e}.pta-nav .flagged{box-shadow:0 -4px #efb43d}.pta-note{font-size:13px;color:#5d7087}.pta-app select{width:auto;max-width:100%;padding:12px;margin:0 12px 12px 0;border:1px solid #b8c8dc;border-radius:8px}.pta-app details{padding:16px 0;border-top:1px solid #d5dfec}.pta-app summary{cursor:pointer;font-weight:650}.pta-review-option{display:flex;align-items:center;gap:15px;border-bottom:1px solid #e5ebf4;padding:8px}.pta-review-option .pta-diagram{width:75px;height:75px;margin:0}.pta-app table{width:100%;border-collapse:collapse;margin:20px 0}.pta-app th,.pta-app td{text-align:left;border-bottom:1px solid #d5dfec;padding:10px}.pta-digits{text-align:center;font-size:64px;letter-spacing:10px;font-weight:800;margin:30px 0}.pta-app input[inputmode=numeric]{display:block;width:100px;font-size:38px;text-align:center;margin:20px auto}.pta-app textarea{width:100%;min-height:100px;border:1px solid #b8c8dc;border-radius:8px;padding:12px;font:inherit}.pta-app fieldset>label{display:inline-flex;align-items:center;gap:6px;margin:6px 14px 12px 0}.pta-zoom{max-width:95vw;width:950px;border:0;border-radius:15px;padding:24px}.pta-zoom::backdrop{background:#10223acc}.pta-zoom .pta-diagram{width:100%;max-height:80vh}.ptm-lesson img{max-width:100%;height:auto}@media(max-width:600px){.pta-visual-options{grid-template-columns:repeat(2,minmax(0,1fr))}.pta-app{padding:16px}.pta-app legend{font-size:17px}.pta-digits{font-size:46px}}@media print{body *{visibility:hidden}.pta-app,.pta-app *{visibility:visible}.pta-app{position:absolute;inset:0;width:100%;max-width:none;border:0}.pta-app button,.pta-app nav{display:none}.pta-app details{display:block;break-inside:avoid}.pta-app details>*{display:block!important}.pta-app summary{list-style:none}}