.icv13-stereo{--ic-navy:#112f5b;--ic-blue:#0e6bce;--ic-border:#d7e5f3;--ic-soft:#eef6fd;color:#233c59;font-family:inherit;max-width:1440px;margin:24px auto;box-sizing:border-box}.icv13-stereo *{box-sizing:border-box}.icv13-stereo-hero{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(240px,.85fr);align-items:center;gap:20px;border:1px solid var(--ic-border);background:linear-gradient(115deg,#f7fbff,#e4f2ff);border-radius:16px;padding:clamp(18px,3vw,34px)}.icv13-stereo h2,.icv13-stereo h3{color:var(--ic-navy);line-height:1.18}.icv13-stereo-hero h2{font-family:Georgia,serif;font-size:clamp(27px,3.2vw,42px);margin:8px 0 10px}.icv13-stereo-hero p{font-size:1.02rem;line-height:1.55}.icv13-stereo-hero img{width:100%;height:auto;display:block;border-radius:12px}.icv13-stereo-kicker{color:#075bb1;font-size:.79rem!important;font-weight:800;letter-spacing:.1em}.icv13-stereo-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:22px}.icv13-stereo-card{border:1px solid var(--ic-border);border-radius:14px;overflow:hidden;background:#fff;box-shadow:0 5px 18px #092b560a}.icv13-stereo-card img{width:100%;height:auto;display:block}.icv13-stereo-card div{padding:17px}.icv13-stereo-card h3{font-size:1.1rem;margin:0 0 7px}.icv13-stereo-card p{font-size:.92rem;line-height:1.5}.icv13-stereo a{color:#095fbe;text-decoration:underline;text-underline-offset:2px}.icv13-stereo-note{color:#49617b;font-size:.88rem}.icv13-stereo-three{display:grid;grid-template-columns:205px minmax(0,1fr) 232px;gap:18px;margin-top:20px;align-items:start}.icv13-stereo-three nav,.icv13-stereo-three aside,.icv13-stereo-body section,.icv13-stereo-goal{padding:18px;background:#fff;border:1px solid var(--ic-border);border-radius:13px}.icv13-stereo-three nav,.icv13-stereo-three aside{position:sticky;top:90px}.icv13-stereo-three ol{padding-left:20px}.icv13-stereo-three li{margin:12px 0;line-height:1.3}.icv13-stereo-body section{margin-bottom:14px}.icv13-stereo-body section h3{display:flex;align-items:center;gap:10px;font-size:1.18rem}.icv13-stereo-body p{line-height:1.72}.icv13-stereo-goal{background:#eaf5ff!important;margin-bottom:15px}.icv13-stereo-goal p{margin-bottom:0}.icv13-stereo-num{border-radius:100px;background:#106bd1;color:#fff;display:inline-flex;align-items:center;justify-content:center;min-width:29px;height:29px;font:700 14px Arial}.icv13-stereo-files{padding-left:19px;overflow-wrap:anywhere}.icv13-stereo-files li{margin:10px 0}.icv13-stereo-workspace{display:grid;grid-template-columns:245px minmax(0,1fr);gap:17px;margin-top:18px}.icv13-stereo-workspace aside,.icv13-stereo-board{border:1px solid var(--ic-border);border-radius:13px;padding:21px;background:#fff;min-width:0}.icv13-stereo-workspace aside label{display:block;font-weight:700;color:var(--ic-navy);margin-bottom:7px}.icv13-stereo-topic{display:block;width:100%;padding:11px;border:1px solid #c7d9ea;border-radius:8px;background:white;color:#16385f;margin-bottom:12px}.icv13-stereo button{cursor:pointer;border:0;border-radius:9px;background:#0f66c3;color:#fff;padding:11px 18px;font:700 .94rem Arial}.icv13-stereo button:focus-visible,.icv13-stereo a:focus-visible,.icv13-stereo input:focus-visible{outline:3px solid #ffab30;outline-offset:3px}.icv13-stereo button:hover{background:#074b95}.icv13-stereo button:disabled{opacity:.55;cursor:default}.icv13-stereo-board h3{font-size:1.35rem}.icv13-stereo-board h4{font-size:1.08rem;color:#153b6f;margin:22px 0}.icv13-stereo-context{background:#f2f8ff;border-left:4px solid #2079d2;padding:14px;line-height:1.55}.icv13-stereo-count{font-weight:700;font-size:.83rem;color:#54718f}.icv13-stereo-options{border:0;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.icv13-stereo-option{display:flex;align-items:center;gap:10px;border:1px solid #d0e0ed;background:#fcfdff;padding:12px;border-radius:9px;cursor:pointer}.icv13-stereo-option:has(input:checked){border-color:#1478cf;background:#e9f4ff}.icv13-stereo-option input{accent-color:#096fcf}.icv13-stereo-actions{display:flex;flex-wrap:wrap;gap:10px;margin:17px 0}.icv13-stereo button.icv13-stereo-hint{background:#e5eff9;color:#17446d}.icv13-stereo-feedback{border-radius:9px;min-height:32px;padding:10px 13px}.icv13-stereo-feedback[data-state=correct]{background:#e4f6eb;color:#125a34}.icv13-stereo-feedback[data-state=wrong]{background:#fff0e9;color:#9a3c1c}.icv13-stereo-feedback[data-state=hint]{background:#fff7df;color:#795300}.icv13-stereo-done{background:#e1f7eb;color:#115f31;padding:17px;border-radius:10px;font-weight:700}.icv13-stereo-visuallyhidden{position:absolute;clip:rect(0 0 0 0);height:1px;width:1px;overflow:hidden;white-space:nowrap}@media(max-width:1040px){.icv13-stereo-three{grid-template-columns:1fr 220px}.icv13-stereo-three nav{grid-column:1/-1;position:static}.icv13-stereo-three aside{position:static}}@media(max-width:760px){.icv13-stereo-hero,.icv13-stereo-workspace,.icv13-stereo-three{grid-template-columns:1fr}.icv13-stereo-cards{grid-template-columns:repeat(2,minmax(0,1fr))}.icv13-stereo-three aside{grid-column:auto}.icv13-stereo-options{grid-template-columns:1fr}}@media(max-width:480px){.icv13-stereo-cards{grid-template-columns:1fr}.icv13-stereo{margin:14px 0}.icv13-stereo-hero,.icv13-stereo-workspace aside,.icv13-stereo-board{padding:15px}.icv13-stereo-hero h2{font-size:27px}}