.icv13-studio{--navy:#102e4b;--text:#15374d;--muted:#557184;--blue:#126d91;--line:#dce8ef;--surface:#f4f9fb;max-width:1300px;margin:24px auto 40px;color:var(--text);font-family:inherit;font-size:16px;line-height:1.58}
.icv13-studio *{box-sizing:border-box}.icv13-studio button,.icv13-studio input,.icv13-studio select{font:inherit}.icv13-studio :focus-visible{outline:3px solid #2e99b5;outline-offset:3px}
.icv13-studio-hero{display:grid;grid-template-columns:1fr 300px;align-items:center;min-height:228px;gap:16px;padding:36px clamp(22px,4vw,54px);border-radius:18px;background:linear-gradient(110deg,#102f4d,#185b79);color:#fff;overflow:hidden}
.icv13-studio-hero h2{color:#fff;font-size:clamp(1.8rem,3vw,2.6rem);letter-spacing:-.032em;line-height:1.15;font-weight:850;margin:8px 0 14px}.icv13-studio-hero p:not(.icv13-studio-kicker){color:#e2f1f5;font-size:1.02rem;max-width:650px;margin:0}
.icv13-studio-hero img{width:100%;height:200px;object-fit:contain}.icv13-studio-kicker{letter-spacing:.115em;text-transform:uppercase;font-size:.72rem;font-weight:800;color:#15758d;margin:0}.icv13-studio-hero .icv13-studio-kicker{color:#85e3eb}
.icv13-studio-pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}.icv13-studio-pills span{font-size:.75rem;font-weight:750;border:1px solid #ffffff55;border-radius:99px;padding:4px 11px;color:#fff}
.icv13-studio-grid{display:grid;grid-template-columns:minmax(0,2.05fr) minmax(245px,.8fr);gap:24px;margin-top:22px;align-items:start}.icv13-studio-main,.icv13-studio-sidecard{background:#fff;border:1px solid var(--line);border-radius:15px;box-shadow:0 6px 26px #082c4409}
.icv13-studio-controls{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;padding:20px 25px;border-bottom:1px solid var(--line);background:var(--surface);border-radius:15px 15px 0 0}.icv13-studio-controls>div{flex:1}.icv13-studio-controls label{display:block;font-size:.79rem;font-weight:800;color:var(--navy);margin-bottom:7px}.icv13-studio-controls select{min-height:45px;padding:9px 12px;border:1px solid #afcad8;background:white;border-radius:9px;width:100%;color:var(--navy)}
.icv13-studio-next,.icv13-studio-check{min-height:44px;padding:10px 18px;background:#126788;color:#fff!important;border:0;border-radius:9px;font-size:.88rem;font-weight:800;cursor:pointer}.icv13-studio-next:hover,.icv13-studio-check:hover{background:#0c4c6d}
.icv13-studio-work{padding:clamp(17px,3vw,32px)}.icv13-studio-problem-title{font-size:clamp(1.45rem,2.3vw,1.9rem);line-height:1.24;letter-spacing:-.02em;color:var(--navy);margin:6px 0 9px;font-weight:850}.icv13-studio-context{font-size:.99rem;margin:0 0 16px}.icv13-studio-formula{font-size:1.12rem;font-weight:750;text-align:center;background:#e8f4f8;color:#153b51;border:1px solid #cfe5ee;border-radius:10px;padding:15px 10px;margin-bottom:14px}.icv13-studio-ref{font-size:.84rem;color:#466b7d;margin:8px 0 20px;padding-left:12px;border-left:3px solid #4aa9be}
.icv13-studio-meter{display:flex;align-items:center;gap:15px;justify-content:space-between;margin:12px 0 18px;color:#1c617d;font-weight:750;font-size:.8rem}.icv13-studio-track{width:44%;height:8px;background:#e1eef3;border-radius:20px;overflow:hidden}.icv13-studio-track span{height:100%;display:block;background:linear-gradient(90deg,#1a80a0,#5ac1a0)}
.icv13-studio-figure{display:block;width:100%;height:auto;max-height:225px;object-fit:contain;border-radius:11px;background:#f6fafb;border:1px solid #e1edf1;margin-bottom:20px;padding:12px}
.icv13-studio-steps{list-style:none;padding:0;margin:0}.icv13-studio-step{border:1px solid #d8e7ed;border-radius:12px;background:#fff;margin:11px 0;padding:17px 19px}.icv13-studio-step.is-done{border-left:4px solid #3a9b83;background:#f5fcf9}.icv13-studio-step.is-locked{background:#f3f7fa;color:#25465d}.icv13-studio-stephead{display:flex;align-items:flex-start;gap:13px}.icv13-studio-number{border-radius:10px;background:#dceff5;color:#125d7c;width:37px;height:37px;display:grid;place-items:center;font-weight:850;flex:none}.icv13-studio-stephead h4{font-size:1rem;color:#12334d;line-height:1.3;margin:0 0 4px;font-weight:820}.icv13-studio-stephead p{font-size:.88rem;margin:0}.icv13-studio-form{margin:13px 0 0 50px}.icv13-studio-form label{display:block;font-size:.8rem;font-weight:750;margin-bottom:5px}.icv13-studio-entry{display:flex;min-width:0;align-items:stretch;gap:0;max-width:460px}.icv13-studio-entry input{min-width:0;width:65%;border:1px solid #a9c5d2;background:#fff;color:#12334d;padding:10px;border-radius:8px 0 0 8px;min-height:45px;font-size:1rem}.icv13-studio-unit{flex:1;background:#edf5f8;color:#284f64;border:1px solid #a9c5d2;border-left:0;border-radius:0 8px 8px 0;padding:10px;font-size:.78rem;display:flex;align-items:center;overflow-wrap:anywhere}.icv13-studio-check{margin:10px 8px 7px 0}.icv13-studio-hint-button,.icv13-studio-reveal{min-height:43px;border:1px solid #b4d0de;color:#176080;background:#fff;border-radius:9px;padding:9px 14px;font-size:.82rem;font-weight:790;cursor:pointer}.icv13-studio-hint{padding:11px 14px;background:#fff9e9;border-left:3px solid #cf9c40;font-size:.83rem;margin:7px 0}.icv13-studio-feedback{font-size:.82rem;color:#984026;margin:5px 0}.icv13-studio-answer{font-weight:790;color:#116149;font-size:.88rem;margin:11px 0 0 50px}.icv13-studio-explain{font-size:.85rem;margin:4px 0 0 50px;color:#3e6273}.icv13-studio-locked-text{font-size:.8rem;margin:9px 0 0 50px;color:#61788a}.icv13-studio-actions{display:flex;align-items:center;flex-wrap:wrap;gap:14px;margin-top:24px}.icv13-studio-success{color:#136951;font-size:.87rem;font-weight:800}
.icv13-studio-side{display:grid;gap:16px}.icv13-studio-sidecard{padding:22px}.icv13-studio-sidecard h3{font-size:1.05rem;color:var(--navy);font-weight:850;margin:0 0 10px}.icv13-studio-sidecard p,.icv13-studio-sidecard li{font-size:.84rem;color:#486677}.icv13-studio-sidecard ol{padding-left:20px;margin:6px 0 12px}.icv13-studio-sidecard li{margin:5px 0}.icv13-studio-sidecard code{background:#eef5f7;border-radius:4px;padding:2px}.icv13-studio-related{display:grid;gap:8px}.icv13-studio-related a{display:block;border-radius:8px;padding:8px 11px;background:#eaf5f8;color:#125b7a;text-decoration:none;font-size:.86rem;font-weight:750}.icv13-studio-related a:hover{text-decoration:underline}
@media(max-width:900px){.icv13-studio-grid{grid-template-columns:1fr}.icv13-studio-side{grid-template-columns:repeat(2,minmax(0,1fr))}.icv13-studio-sidecard:last-child{grid-column:1 / -1}.icv13-studio-hero{grid-template-columns:1fr 200px}}
@media(max-width:600px){.icv13-studio-hero{display:block;padding:25px 20px}.icv13-studio-hero img{display:none}.icv13-studio-grid{gap:12px}.icv13-studio-controls{padding:16px;align-items:stretch;flex-direction:column}.icv13-studio-work{padding:16px}.icv13-studio-step{padding:13px}.icv13-studio-form,.icv13-studio-answer,.icv13-studio-explain,.icv13-studio-locked-text{margin-left:0}.icv13-studio-side{grid-template-columns:1fr}.icv13-studio-sidecard:last-child{grid-column:auto}.icv13-studio-meter{align-items:flex-start;flex-direction:column}.icv13-studio-track{width:100%}.icv13-studio-stephead{gap:8px}}
@media(prefers-reduced-motion:reduce){.icv13-studio *{scroll-behavior:auto!important;transition:none!important}}

.icv13-studio-resource{border-top:1px solid #dfebef;padding:10px 0}.icv13-studio-resource strong{display:block;font-size:.81rem;color:#173b56;margin-bottom:6px}.icv13-studio-resource>div{display:flex;flex-wrap:wrap;gap:7px}.icv13-studio-resource a{font-size:.75rem;font-weight:750;color:#0f6184;border:1px solid #c4dde5;border-radius:6px;padding:3px 7px;text-decoration:none}.icv13-studio-resource a:hover{background:#e6f4f9;text-decoration:underline}

/* v13.20 accessibility: do not fade instructional text or conceal keyboard state. */
.icv13-studio-hint-button,.icv13-studio-reveal{min-height:44px}
.icv13-studio-problem-title,.icv13-studio-solution-title{scroll-margin-top:5rem}
.icv13-studio-step.is-locked .icv13-studio-locked-text{color:#334f63}