:root{--bg:#f7f7f5;--surface:#fff;--surface-2:#f0f0ec;--text:#1c1c1a;--muted:#5f5f5a;--border:#dcdcd6;--accent:#0f6e56;--accent-soft:#e1f2ec;--accent-text:#fff;--good:#1d7a3e;--good-soft:#e3f4e8;--bad:#b3261e;--bad-soft:#fbe7e5;--warn:#8a5a00;--warn-soft:#fdf1d8;--info:#24569c;--info-soft:#e5eefb;--radius:12px;--shadow:0 1px 2px #0000000f;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--bg:#141413;--surface:#1d1d1b;--surface-2:#262624;--text:#ecece8;--muted:#a5a59e;--border:#3a3a36;--accent:#3fb391;--accent-soft:#173a30;--accent-text:#0b1f19;--good:#5cc983;--good-soft:#17331f;--bad:#f08b83;--bad-soft:#3a1c1a;--warn:#e7b453;--warn-soft:#382a10;--info:#8db5ef;--info-soft:#1a2a40;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}:root[data-theme=dark]{--bg:#141413;--surface:#1d1d1b;--surface-2:#262624;--text:#ecece8;--muted:#a5a59e;--border:#3a3a36;--accent:#3fb391;--accent-soft:#173a30;--accent-text:#0b1f19;--good:#5cc983;--good-soft:#17331f;--bad:#f08b83;--bad-soft:#3a1c1a;--warn:#e7b453;--warn-soft:#382a10;--info:#8db5ef;--info-soft:#1a2a40;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font:calc(16px * var(--font-scale,1))/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;color:inherit}a{color:var(--accent)}.app{max-width:920px;margin:0 auto;padding:0 16px 64px}header.top{z-index:10;background:var(--bg);border-bottom:1px solid var(--border);flex-wrap:wrap;align-items:center;gap:12px;margin:0 -16px 20px;padding:10px 16px;display:flex;position:sticky;top:0}header.top .brand{color:var(--text);align-items:center;gap:8px;margin-right:auto;font-weight:700;text-decoration:none;display:flex}header.top .brand img{width:26px;height:26px}header.top nav{flex-wrap:wrap;gap:4px;display:flex}header.top nav a{color:var(--muted);border-radius:8px;padding:6px 10px;font-size:15px;text-decoration:none}header.top nav a.active{color:var(--text);background:var(--surface-2)}h1{margin:4px 0 6px;font-size:26px;line-height:1.25}h2{margin:24px 0 10px;font-size:19px}h3{margin:16px 0 8px;font-size:16px}p.lead{color:var(--muted);margin:0 0 20px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:16px;padding:18px}.grid{gap:12px;display:grid}.grid.two{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.grid.modes{grid-template-columns:repeat(auto-fit,minmax(190px,1fr));grid-auto-rows:1fr}.btn{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:10px;justify-content:center;align-items:center;gap:6px;min-height:42px;padding:9px 16px;font-size:15px;font-weight:600;text-decoration:none;display:inline-flex}.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.btn.danger{color:var(--bad)}.btn.small{min-height:32px;padding:5px 10px;font-size:14px;font-weight:500}.btn:disabled{opacity:.45;cursor:not-allowed}.btn-row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.mode{text-align:left;border:1px solid var(--border);background:var(--surface);border-radius:var(--radius);cursor:pointer;flex-direction:column;gap:4px;min-height:108px;padding:14px;display:flex}.mode strong{font-size:16px}.mode span{color:var(--muted);font-size:14px}.mode .count{color:var(--accent);margin-top:auto;font-size:13px;font-weight:600}.mode:disabled{opacity:.5;cursor:not-allowed}fieldset{border:0;min-width:0;margin:0 0 14px;padding:0}legend{color:var(--muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:6px;font-size:14px;font-weight:600}.chips{flex-wrap:wrap;gap:6px;display:flex}.chip{border:1px solid var(--border);background:var(--surface);cursor:pointer;-webkit-user-select:none;user-select:none;border-radius:999px;padding:5px 11px;font-size:14px}.chip[aria-pressed=true]{background:var(--accent-soft);border-color:var(--accent);color:var(--text);font-weight:600}.chip small{color:var(--muted);margin-left:4px;font-weight:400}.row{flex-wrap:wrap;align-items:center;gap:16px;display:flex}.row label{align-items:center;gap:6px;min-height:24px;font-size:15px;display:flex}select,input[type=number],textarea{border:1px solid var(--border);background:var(--surface);border-radius:8px;padding:6px 10px}textarea{width:100%;min-height:80px}.muted{color:var(--muted)}.small{font-size:14px}.progress-bar{background:var(--surface-2);border-radius:999px;height:6px;overflow:hidden}.progress-bar>div{background:var(--accent);height:100%;transition:width .2s}.qmeta{color:var(--muted);flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px;font-size:13px;display:flex}.badge{background:var(--surface-2);color:var(--muted);white-space:nowrap;border-radius:999px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-block}.badge.good{background:var(--good-soft);color:var(--good)}.badge.warn{background:var(--warn-soft);color:var(--warn)}.badge.bad{background:var(--bad-soft);color:var(--bad)}.badge.info{background:var(--info-soft);color:var(--info)}.case{background:var(--surface-2);border-radius:10px;margin-bottom:12px;padding:10px 14px;font-size:15px}.case summary{cursor:pointer;font-weight:600}.case div{white-space:pre-wrap;margin-top:8px}.instruction{color:var(--muted);margin-bottom:6px;font-style:italic}.stem{font-size:calc(18px * var(--font-scale,1));white-space:pre-wrap;margin:0 0 6px}.reason{font-size:calc(17px * var(--font-scale,1));white-space:pre-wrap;margin:8px 0 0}.ar-label{color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-size:12px;font-weight:700}.options{flex-direction:column;gap:8px;margin:14px 0 6px;display:flex}.option{text-align:left;border:1.5px solid var(--border);background:var(--surface);cursor:pointer;width:100%;font-size:calc(16px * var(--font-scale,1));border-radius:10px;align-items:flex-start;gap:12px;padding:11px 14px;display:flex}.option .key{background:var(--surface-2);border-radius:50%;flex:none;place-items:center;width:28px;height:28px;font-size:14px;font-weight:700;display:grid}.option.selected{border-color:var(--accent);background:var(--accent-soft)}.option.selected .key{background:var(--accent);color:var(--accent-text)}.option.correct{border-color:var(--good);background:var(--good-soft)}.option.correct .key{background:var(--good);color:#fff}.option.wrong{border-color:var(--bad);background:var(--bad-soft)}.option.wrong .key{background:var(--bad);color:#fff}.option:disabled{cursor:default}.feedback{border-radius:10px;margin-top:12px;padding:12px 14px}.feedback.good{background:var(--good-soft)}.feedback.bad{background:var(--bad-soft)}.feedback.neutral{background:var(--surface-2)}.feedback strong{margin-bottom:4px;display:block}.feedback p{white-space:pre-wrap;margin:6px 0 0}.note{background:var(--warn-soft);border-radius:10px;margin-top:10px;padding:10px 14px;font-size:15px}.sources{color:var(--muted);margin-top:10px;font-size:13px}.session-top{flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:12px;display:flex}.session-top .grow{flex:1;min-width:140px}.timer{font-variant-numeric:tabular-nums;font-weight:700}.timer.low{color:var(--bad)}.palette{flex-wrap:wrap;gap:6px;margin:12px 0;display:flex}.palette button{border:1px solid var(--border);background:var(--surface);cursor:pointer;border-radius:8px;width:36px;height:36px;font-size:13px;font-weight:600}.palette button.answered{background:var(--accent-soft);border-color:var(--accent)}.palette button.current{outline:2px solid var(--accent);outline-offset:1px}.palette button.flagged{box-shadow:inset 0 -3px 0 var(--warn)}.palette button.right{background:var(--good-soft);border-color:var(--good)}.palette button.miss{background:var(--bad-soft);border-color:var(--bad)}.stat-tiles{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:16px;display:grid}.tile{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px}.tile .v{font-size:26px;font-weight:700}.tile .l{color:var(--muted);font-size:13px}table.stats{border-collapse:collapse;width:100%;font-size:14px}table.stats th,table.stats td{text-align:left;border-bottom:1px solid var(--border);vertical-align:middle;padding:8px 6px}table.stats th{color:var(--muted);font-weight:600}table.stats td.num{text-align:right;font-variant-numeric:tabular-nums;white-space:nowrap}.bar{background:var(--surface-2);border-radius:999px;min-width:60px;height:8px;overflow:hidden}.bar>div{height:100%}.score{font-size:44px;font-weight:800;line-height:1}.list-q{border-top:1px solid var(--border);padding:12px 0}.list-q:first-child{border-top:0}.empty{text-align:center;color:var(--muted);padding:40px 16px}.kbd{border:1px solid var(--border);border-bottom-width:2px;border-radius:4px;padding:0 5px;font-family:ui-monospace,monospace;font-size:12px}.toast{background:var(--text);color:var(--bg);z-index:50;border-radius:10px;padding:10px 16px;font-size:14px;position:fixed;bottom:20px;left:50%;transform:translate(-50%);box-shadow:0 4px 16px #0003}@media (width<=560px){h1{font-size:22px}.stem{font-size:17px}.card{padding:14px}header.top nav{flex-wrap:wrap;justify-content:center;gap:0 2px;width:100%}header.top nav a{white-space:nowrap;padding:6px;font-size:14px}.keys-hint{display:none}}@media (width<=380px){header.top nav a{padding:6px 4px;font-size:13px}}.tabbar{display:none}@media (width<=600px){:root{--tabbar-h:58px}header.top nav.main-nav{display:none}.app{padding-bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 24px)}.tabbar{z-index:30;background:var(--surface);border-top:1px solid var(--border);padding:0 env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);display:flex;position:fixed;bottom:0;left:0;right:0}.tabbar>a,.tabbar>button{min-width:0;min-height:var(--tabbar-h);text-align:center;font:inherit;color:var(--muted);cursor:pointer;background:0 0;border:0;border-top:3px solid #0000;flex:1 1 0;justify-content:center;align-items:center;padding:4px 2px;font-size:13px;line-height:1.2;text-decoration:none;display:flex}.tabbar>a.active,.tabbar>button.active,.tabbar>button[aria-expanded=true]{color:var(--accent);border-top-color:var(--accent);font-weight:700}.tabbar-more{right:8px;bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 8px);z-index:31;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);min-width:180px;box-shadow:var(--shadow);flex-direction:column;padding:6px;display:flex;position:fixed}.tabbar-more a{min-height:48px;color:var(--text);border-radius:8px;align-items:center;padding:0 14px;text-decoration:none;display:flex}.tabbar-more a.active{background:var(--accent-soft);font-weight:700}.toast{bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 12px)}}@media (hover:hover){header.top nav a:hover{color:var(--text);background:var(--surface-2)}.btn:hover:not(:disabled){background:var(--surface-2)}.btn.primary:hover:not(:disabled){background:var(--accent);filter:brightness(1.06)}.mode:hover:not(:disabled),.option:hover:not(:disabled),.chip:hover:not(:disabled),.group-choices .letter:hover:not(:disabled),.bubble:hover{border-color:var(--accent)}.seg button:not(.on):hover{color:var(--text)}.topic-row:hover{background:var(--surface-2)}.topic-panel .btn:not(.primary):hover:not(:disabled){background:var(--surface);border-color:var(--accent)}}:focus-visible,.option:focus-visible,.btn:focus-visible,.chip:focus-visible{outline:3px solid var(--info);outline-offset:2px}.qnum:focus{outline:none}.qnum:focus-visible{outline:2px dashed var(--info)}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;position:absolute!important}.skip-link{z-index:100;background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:8px 12px;position:absolute;top:-60px;left:8px}.skip-link:focus{top:8px}mark{color:inherit;background:#fde68a;border-radius:3px;padding:0 1px}:root[data-theme=dark] mark{background:#6b5310}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) mark{background:#6b5310}}.link-btn{color:var(--accent);cursor:pointer;font-size:inherit;background:0 0;border:0;padding:0;text-decoration:underline}.error-text{color:var(--bad)}.stack{flex-direction:column;gap:4px;margin-top:10px;display:flex}.stack input[type=text],.stack input[type=date],.stack input[type=number],input[type=text],input[type=date],input[type=search]{border:1px solid var(--border);background:var(--surface);border-radius:8px;max-width:100%;padding:7px 10px}.settings-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr));align-items:start}.settings-grid .stack{margin-top:0}.table-scroll{-webkit-overflow-scrolling:touch;overflow-x:auto}h2.qnum{color:var(--muted);margin:0;font-size:14px;font-weight:600}.option-row{align-items:stretch;gap:6px;display:flex}.option-row .option{flex:1}.strike-btn{border:1px solid var(--border);background:var(--surface);cursor:pointer;width:38px;color:var(--muted);border-radius:10px;flex:none;font-size:16px}.strike-btn[aria-pressed=true]{color:var(--bad);border-color:var(--bad)}.option.struck>span:last-child{color:var(--muted);text-decoration:line-through}.option.struck{opacity:.7}.option.disputed-key{border-color:var(--warn);background:var(--warn-soft)}.option.disputed-key .key{background:var(--warn);color:#fff}.group-expl .ref-chip{width:fit-content;max-width:100%;display:block}.ref-chip{background:var(--info-soft);color:var(--info);border-radius:8px;margin-top:8px;padding:3px 8px;font-size:13px;display:inline-block}.ar-help{margin:6px 0}.ar-help summary{cursor:pointer;color:var(--accent)}.ar-help ol{margin:6px 0 0;padding-left:22px}.my-note{background:var(--info-soft);border-radius:10px;margin-top:10px;padding:10px 14px;font-size:15px}.my-note .note-text{white-space:pre-wrap}.my-note textarea{margin:6px 0}.rating{flex-wrap:wrap;align-items:center;gap:6px;margin-top:12px;display:flex}.rating .chip:disabled{opacity:.4;cursor:not-allowed}.group-options{margin:8px 0 12px;padding-left:26px}.group-options li{margin:3px 0}.group-rows{flex-direction:column;gap:10px;display:flex}.group-row{border:1px solid var(--border);border-radius:10px;padding:10px 12px}.group-stem{margin-bottom:8px}.group-choices{flex-wrap:wrap;gap:6px;display:flex}.group-choices .letter{border:1.5px solid var(--border);background:var(--surface);cursor:pointer;border-radius:50%;width:40px;height:40px;font-weight:700}.group-choices .letter.selected{background:var(--accent);border-color:var(--accent);color:var(--accent-text)}.group-choices .letter.correct{background:var(--good);border-color:var(--good);color:#fff}.group-choices .letter.wrong{background:var(--bad);border-color:var(--bad);color:#fff}.group-choices .letter.disputed-key{background:var(--warn);border-color:var(--warn);color:#fff}.group-choices .letter:disabled{cursor:default}.group-expl{margin-top:8px}.search input{border-radius:10px;width:100%;margin-bottom:12px;padding:10px 14px;font-size:16px}.quick{flex-wrap:wrap;gap:8px;margin-bottom:6px;display:flex}.exam-warning{background:var(--warn-soft);color:var(--warn);border:1px solid var(--warn);border-radius:10px;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px;padding:8px 12px;font-weight:600;display:flex}.exam-warning .btn{min-height:32px}.rules{margin:0 0 12px;padding-left:20px}.rules li{margin:4px 0}.weekly-card .grow{flex:220px;min-width:0}.flag-note{color:var(--warn);margin:0 0 4px 4px;font-weight:600}.resume{border-color:var(--accent);background:var(--accent-soft);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}details.customise>summary{cursor:pointer;font-size:16px;font-weight:700}details.customise[open]>summary{margin-bottom:14px}.mobile-start{display:none}.overlay{z-index:60;background:#00000073;place-items:center;padding:16px;display:grid;position:fixed;inset:0}.overlay-card{width:100%;max-width:460px;max-height:90vh;overflow:auto}.goal-card{align-items:center;gap:16px;display:flex}.ring{flex:none}.trend{width:100%;height:auto;max-height:200px;display:block}.bar-cell{align-items:center;gap:8px;display:flex}.bar-cell .bar{flex:1}.bar-cell .small{text-align:right;font-variant-numeric:tabular-nums;width:52px}.site-footer{text-align:center;margin-top:32px}.about h2{margin-top:0}.about ul{padding-left:20px}.about li{margin:4px 0}.creator-name{line-height:1.5}.sheet-index ul{columns:2 260px;margin:0;padding-left:20px}.sheet-index li{margin:2px 0}.sheet-table td,.sheet-table th{vertical-align:top}.sheet-table td:first-child{font-weight:600}.sheet-bullets{margin:10px 0 0;padding-left:20px}.sheet-bullets li{margin:4px 0}.paper-q{break-inside:avoid;margin-bottom:14px}.paper-q p{margin:0 0 4px}.paper-opts{margin:0;padding-left:26px}.paper-case{background:var(--surface-2);white-space:pre-wrap;border-radius:8px;margin-bottom:8px;padding:8px 12px}.bubble-sheet{grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:6px 18px;margin-bottom:16px;display:grid}.bubble-row{break-inside:avoid;align-items:center;gap:6px;display:flex}.bubble-n{text-align:right;font-variant-numeric:tabular-nums;width:28px;font-size:14px;font-weight:700}.bubble{border:1.5px solid var(--border);background:var(--surface);width:30px;height:30px;color:var(--text);border-radius:50%;place-items:center;font-size:12px;font-weight:700;display:inline-grid}button.bubble{cursor:pointer;width:36px;height:36px}.bubble.on{background:var(--text);color:var(--bg);border-color:var(--text)}.print-only{display:none}@media (width<=560px){.mobile-start{bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom));z-index:20;background:var(--bg);border-top:1px solid var(--border);margin:12px -16px 0;padding:10px 16px;display:block;position:sticky}.mobile-start .btn{width:100%}.goal-card{align-items:flex-start}header.top{position:static}.strike-btn{width:34px}}@media print{.no-print,header.top,.site-footer,.toast,.skip-link,.session-top,.mobile-start{display:none!important}.print-only{display:block}body{color:#000;background:#fff;font-size:11pt}.app{max-width:none;padding:0}.card{box-shadow:none;border:0;padding:0}.paper-case{background:0 0;border:1px solid #999}.bubble{color:#000;background:#fff;border-color:#000}a{color:#000}}summary{min-height:24px;line-height:24px}.set-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:8px;display:grid}.set-card{text-align:left;flex-direction:column;justify-content:flex-start;align-items:flex-start;gap:4px;min-height:72px}.set-card .small{font-weight:400}.btn.primary .badge.info{background:var(--surface);color:var(--text)}.seg{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius);flex-wrap:wrap;gap:4px;margin:0 0 16px;padding:4px;display:flex}.seg button{min-width:0;min-height:44px;font:inherit;color:var(--muted);cursor:pointer;touch-action:manipulation;white-space:nowrap;background:0 0;border:0;border-radius:8px;flex:1 1 0;padding:8px 12px;font-weight:600}.seg button.on{color:var(--text);background:var(--surface);box-shadow:var(--shadow)}.seg button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.weak-list{margin:0;padding:0;list-style:none}.weak-list li{border-top:1px solid var(--border);grid-template-columns:minmax(0,1.4fr) minmax(0,1fr) auto;align-items:center;gap:8px 12px;padding:10px 0;display:grid}.weak-list li:first-child{border-top:0}.weak-main{overflow-wrap:anywhere;flex-wrap:wrap;align-items:center;gap:4px 8px;display:flex}@media (width<=520px){.weak-list li{grid-template-columns:1fr auto}.weak-list li .bar-cell{order:3;grid-column:1/-1}.seg button{padding:8px 4px;font-size:14px}}.btn,.option,.chip,button.bubble,a.btn{touch-action:manipulation}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}.stem,.reason,.case div,.option,.paper-case{overflow-wrap:anywhere}.badge.paper{color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent);background:0 0}.topic-card{padding:4px 14px}.topic-list{margin:0;padding:0;list-style:none}.topic-list>li+li{border-top:1px solid var(--border)}.topic-row{width:100%;min-height:48px;font:inherit;color:inherit;text-align:left;cursor:pointer;touch-action:manipulation;background:0 0;border:0;border-radius:8px;align-items:center;gap:8px;padding:10px 2px;display:flex}.topic-row:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.topic-name{overflow-wrap:anywhere;flex:1;min-width:0;font-weight:600}.topic-pct{text-align:right;font-variant-numeric:tabular-nums;min-width:44px}.topic-row .chev{color:var(--muted);flex:none;transition:transform .15s}.topic-row[aria-expanded=true] .chev{transform:rotate(180deg)}.topic-panel{background:var(--surface-2);border-radius:10px;margin:0 0 12px;padding:10px 12px 12px}.topic-panel .bar{background:var(--surface)}.topic-line{grid-template-columns:7.5em minmax(0,1fr);align-items:center;gap:8px;max-width:560px;min-height:28px;font-size:14px;display:grid}.topic-panel .btn-row{margin-top:10px}.topic-empty{margin:12px 0}@media (width<=520px){.topic-panel .btn-row .btn{flex:auto}}.btn-reset{font:inherit;color:inherit;cursor:pointer;background:0 0;border:0;flex-direction:column;gap:4px;padding:0;display:flex}.follow-up{margin:8px 0 0}.seen-before{margin-top:8px}.oral-notices{margin:0;padding-left:20px}.oral-notices li{margin-bottom:6px}.oral-step ul{padding-left:20px}.oral-step li{margin-bottom:6px}.oral-panels{grid-template-columns:repeat(auto-fill,minmax(min(100%,260px),1fr));gap:10px;display:grid}.oral-panel{overflow-wrap:anywhere}