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18px;font-size:1.22rem;font-weight:640;line-height:1.75}.q-meta{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.explain{background:var(--sheet-2);border-left:4px solid var(--good);border-radius:12px;margin-top:16px;padding:14px 16px}.explain.is-wrong{border-left-color:var(--bad)}.xp-pop{color:var(--gold);align-items:center;gap:6px;font-weight:760;animation:.5s both pop;display:inline-flex}@keyframes pop{0%{opacity:0;transform:translateY(6px)scale(.9)}to{opacity:1;transform:none}}.sticky-actions{z-index:25;padding:10px 16px calc(10px + env(safe-area-inset-bottom));background:var(--paper);position:fixed;inset:auto 0 0}@supports (color:color-mix(in lab, red, red)){.sticky-actions{background:color-mix(in srgb, var(--paper) 92%, transparent)}}.sticky-actions{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--line)}.sticky-actions .row{gap:10px;width:min(720px,100%);margin-inline:auto;display:flex}.sticky-actions .btn{flex:1}.ring{--p:0;background:conic-gradient(var(--blue) calc(var(--p) * 1%), var(--sheet-2) 0);border-radius:50%;place-items:center;width:120px;height:120px;display:grid}.ring>div{background:var(--sheet);text-align:center;border-radius:50%;place-items:center;width:92px;height:92px;font-size:1.5rem;font-weight:760;line-height:1.1;display:grid}.ring small{color:var(--ink-soft);font-size:.7rem;font-weight:500;display:block}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;display:grid}.stat{background:var(--sheet);border:1px solid var(--line);border-radius:14px;padding:12px 14px}.stat b{font-size:1.6rem;font-weight:760;line-height:1.2;display:block}.stat span{color:var(--ink-soft);font-size:.84rem}.streak-flame{color:var(--gold)}.badge-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;display:grid}.badge{text-align:center;border:1.5px solid var(--line);background:var(--sheet);border-radius:14px;justify-items:center;gap:4px;padding:14px 10px;display:grid}.badge svg{width:28px;height:28px;color:var(--gold)}.badge.is-off{background:var(--sheet-2);border-style:dashed}.badge.is-off svg{color:var(--ink-soft)}.badge b{font-size:.95rem;line-height:1.3}.badge span{color:var(--ink-soft);font-size:.78rem;line-height:1.4}.lock-card{text-align:center;border:1.5px dashed var(--line);background:var(--sheet);border-radius:18px;justify-items:center;gap:12px;padding:28px 18px;display:grid}.lock-card svg{width:34px;height:34px;color:var(--violet)}.lock-card.is-pro svg{color:var(--gold)}.session-row{border:1.5px solid var(--line);background:var(--sheet);color:inherit;border-radius:14px;grid-template-columns:1fr auto;align-items:center;gap:12px;padding:14px 16px;text-decoration:none;display:grid}.session-row:hover{border-color:var(--blue)}.session-row.is-locked{background:var(--sheet-2)}.tabs{background:var(--sheet-2);border-radius:12px;gap:4px;width:-moz-fit-content;width:fit-content;max-width:100%;padding:4px;display:flex;overflow-x:auto}.tabs button{color:var(--ink-soft);cursor:pointer;white-space:nowrap;background:0 0;border:0;border-radius:9px;padding:7px 14px;font-weight:650}.tabs button[aria-selected=true],.tabs button[aria-checked=true]{background:var(--sheet);color:var(--ink);box-shadow:0 1px 2px #0000001f}.hero{gap:28px;padding-block:18px 8px;display:grid}@media (min-width:900px){.hero{grid-template-columns:1.05fr .95fr;align-items:center;gap:44px;padding-block:36px 16px}}.hero .lead{color:var(--ink-soft);max-width:34em;font-size:1.14rem}.skeleton{background:linear-gradient(90deg, var(--sheet-2), var(--sheet-2), var(--sheet-2));border-radius:14px}@supports (color:color-mix(in lab, red, red)){.skeleton{background:linear-gradient(90deg, var(--sheet-2), color-mix(in srgb, var(--sheet-2) 60%, var(--sheet)), var(--sheet-2))}}.skeleton{background-size:200% 100%;min-height:90px;animation:1.4s linear infinite shimmer}@keyframes shimmer{to{background-position:-200% 0}}.toast-wrap{z-index:60;pointer-events:none;justify-items:center;gap:8px;display:grid;position:fixed;inset:auto 16px 84px}.toast{pointer-events:auto;background:var(--ink);color:var(--paper);box-shadow:var(--shadow);border-radius:12px;max-width:440px;padding:10px 16px;font-weight:600}@media (min-width:820px){.toast-wrap{justify-items:end;inset:auto 24px 24px auto}}.captcha-slot{z-index:70;justify-content:center;display:flex;position:fixed;inset:auto 0 100px}.modal-back{z-index:55;background:#080c188c;place-items:center;padding:16px;display:grid;position:fixed;inset:0}.modal{background:var(--sheet);border:1px solid var(--line);border-radius:18px;width:min(460px,100%);padding:22px;box-shadow:0 30px 80px -20px #00000080}table.tbl{border-collapse:collapse;width:100%;font-size:.92rem}.tbl th,.tbl td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:8px 10px}.tbl th{color:var(--ink-soft);font-weight:700}.study{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;position:relative}.study *{-webkit-user-select:none;user-select:none}.study-q{border-bottom:1px solid var(--line);padding:16px 0}.study-q .t:before{content:attr(data-t);white-space:pre-line}.study-q .t{display:inline}.study-q .stem{font-size:1.1rem;font-weight:650;line-height:1.7}.study-q .opt{grid-template-columns:28px 1fr;gap:10px;padding:3px 0;display:grid}.study-q .opt .bubble{border-width:1.5px;width:26px;height:26px;font-size:.8rem}.study-q .opt.is-answer .bubble{background:var(--good);border-color:var(--good);color:#fff}.study-q .opt.is-answer{color:var(--good);font-weight:650}.study-q .why{background:var(--sheet-2);border-radius:10px;margin-top:6px;padding:8px 12px;font-size:.95rem}.study-q .no{color:var(--ink-soft);font-weight:760}.wm-layer{z-index:40;pointer-events:none;position:fixed;inset:0;overflow:hidden}.shield{z-index:90;background:var(--paper);text-align:center;place-items:center;padding:24px;font-weight:700;display:none;position:fixed;inset:0}.shield.on{display:grid}@media print{body>*{display:none!important}body:before{content:"DigitalHub-Learn2Earn - printing is disabled";padding:40px;font-size:20px;display:block}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.001ms!important;animation-duration:.001ms!important}}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}body.focus .tabbar{display:none!important}body.focus .footer{display:none}body.focus .page{padding-bottom:130px}.pe-none{pointer-events:none;opacity:.45}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}