.oac-v2-app{box-sizing:border-box;margin:20px auto 35px;max-width:1220px;font-family:system-ui,-apple-system,'Segoe UI',sans-serif;color:#edf7f7;background:#0b1b2b;border:1px solid #2e4a5b;border-radius:20px;overflow:hidden;box-shadow:0 15px 42px rgba(0,0,0,.12)}.oac-v2-app *{box-sizing:border-box}.oac-v2-app button,.oac-v2-app textarea{font:inherit}.oac-v2-top{display:flex;gap:12px;justify-content:space-between;align-items:center;background:#102638;border-bottom:1px solid #294758;padding:15px 22px}.oac-v2-brand,.oac-v2-smallcap{font-size:11px;letter-spacing:.16em;font-weight:800;color:#91d5cb}.oac-v2-back,.oac-v2-back:visited{color:#d8ff9c!important;text-decoration:none;font-weight:650}.oac-v2-layout{display:grid;grid-template-columns:minmax(230px,280px) minmax(0,1fr);min-height:620px}.oac-v2-aside{padding:26px 20px;border-right:1px solid #294758;background:#102334}.oac-v2-aside h3{color:#fff!important;font-size:23px;line-height:1.24;margin:14px 0 20px!important}.oac-v2-progress{margin:16px 0 27px}.oac-v2-progress-meta{display:flex;justify-content:space-between;gap:6px;font-size:12px;color:#d3e6e7;margin-bottom:9px}.oac-v2-track{height:9px;background:#294b59;border-radius:99px;overflow:hidden}.oac-v2-track>span{height:100%;display:block;background:linear-gradient(90deg,#66d6c0,#c9ef82);border-radius:inherit}.oac-v2-module{border:1px solid transparent;background:transparent;display:block;width:100%;padding:15px 13px;margin:9px 0;color:#d0e4e8;text-align:left;font-size:13px;border-radius:11px;cursor:pointer;line-height:1.45}.oac-v2-module.is-active{background:#25463e;border-color:#416d57;color:#eaffbc}.oac-v2-module:disabled{opacity:.48;cursor:not-allowed}.oac-v2-aside-tip{color:#90aaba!important;font-size:12px!important;line-height:1.6!important;margin:30px 0 0}.oac-v2-main{padding:clamp(25px,4vw,58px);min-width:0}.oac-v2-step-counter{color:#9ce0d1!important;font-size:11px!important;letter-spacing:.14em;font-weight:850;margin:0 0 13px!important}.oac-v2-app .oac-v2-heading{color:#fff!important;font-size:clamp(28px,4.2vw,43px)!important;line-height:1.18!important;margin:0 0 24px!important;max-width:730px}.oac-v2-body{white-space:pre-line;color:#d5e4ea;line-height:1.8;font-size:clamp(15px,1.7vw,18px);margin:0 0 24px}.oac-v2-help-toggle,.oac-v2-review{background:none;border:0;padding:0;color:#d4fa98!important;text-decoration:underline;cursor:pointer;display:inline-flex;margin:6px 0 23px;font-weight:650;font-size:14px}.oac-v2-help{border-left:4px solid #c9ef82;background:#1d3941;color:#e8f2e0;line-height:1.7;white-space:pre-line;padding:16px;border-radius:8px;margin:0 0 24px}.oac-v2-choices{border:0;padding:0;margin:25px 0 20px;min-width:0}.oac-v2-choices legend,.oac-v2-text-label{color:#fff;font-weight:750;margin-bottom:12px;display:block}.oac-v2-option{display:flex;gap:13px;align-items:flex-start;background:#142c3d;border:1px solid #355369;border-radius:12px;padding:15px;margin:10px 0;cursor:pointer;color:#e8f2f5;line-height:1.5}.oac-v2-option:hover,.oac-v2-option:focus-within{border-color:#a1dca6;background:#1f3e45}.oac-v2-option input{accent-color:#b9ec7d;margin-top:5px;flex:0 0 auto}.oac-v2-text-label{margin-top:25px}.oac-v2-textarea{display:block;width:100%;border:1px solid #507080;background:#f8fdfc;color:#18343e;min-height:125px;border-radius:12px;padding:16px;line-height:1.6;resize:vertical}.oac-v2-letters{color:#98b7c6;font-size:12px;margin:6px 0 20px}.oac-v2-done{background:#214b3e;color:#ddf7ce;padding:14px 16px;border:1px solid #458065;border-radius:11px;margin:22px 0}.oac-v2-answer{color:#cde2e6;border-left:3px solid #6dccb3;padding:12px 14px;margin:10px 0 25px;background:#142e3a;white-space:pre-line}.oac-v2-feedback{padding:16px;border-radius:10px;margin:19px 0;font-weight:650;line-height:1.6}.oac-v2-feedback.is-success{background:#1c493b;color:#e4ffd2;border:1px solid #487b56}.oac-v2-feedback.is-error{background:#59332f;color:#ffe2cb;border:1px solid #b3765e}.oac-v2-controls{display:flex;gap:10px;justify-content:space-between;align-items:center;margin:24px 0 20px;flex-wrap:wrap}.oac-v2-button{display:inline-block;border:0;border-radius:10px;padding:13px 18px;background:#c9ef82;color:#183127;font-size:15px;font-weight:850;cursor:pointer;min-height:46px}.oac-v2-button:hover{background:#e2ffab}.oac-v2-button.secondary{border:1px solid #4c7076;background:#173346;color:#e6f7f4}.oac-v2-button:disabled{opacity:.45;cursor:not-allowed}.oac-v2-privacy{font-size:12px;color:#8ba6b8;line-height:1.65;border-top:1px solid #284556;padding-top:16px;margin-top:20px}.oac-v2-status{padding:10px 24px;background:#102638;border-top:1px solid #294758;color:#a9e4c6;text-align:right;font-size:12px}.oac-v2-status[data-error=true]{color:#f6ac99}.oac-v2-loading{padding:80px 25px;text-align:center;color:#e5f4e7}.oac-v2-trophy{font-size:62px;margin:0 0 20px}.oac-v2-finish-copy{line-height:1.75;color:#dae9ec;font-size:18px}.oac-v2-finish-panel{border:1px solid #57856b;background:linear-gradient(120deg,#1c473d,#214b43);border-radius:16px;padding:26px;margin:30px 0}.oac-v2-finish-panel strong{font-size:21px;color:#fff}.oac-v2-finish-panel p{color:#d6f4e8;line-height:1.6}.oac-v2-finish-actions{display:flex;gap:10px;flex-wrap:wrap}.oac-v2-review{margin-right:24px}.oac-builder-list{margin:35px 0}.oac-wrap .oac-section-title{font-size:24px;margin:16px 0;color:#fff}.oac-v2-card{margin-top:16px}.oac-mini-progress{width:100%;height:7px;border-radius:50px;background:#294959;margin:4px 0 5px!important;overflow:hidden}.oac-mini-progress>span{display:block;height:100%;background:linear-gradient(90deg,#6ad5c4,#c9ef82)}.oac-wrap p.oac-steps-label{font-size:12px;color:#b8d4d6;margin:0 0 16px}@media(max-width:850px){.oac-v2-layout{grid-template-columns:1fr}.oac-v2-aside{border-right:0;border-bottom:1px solid #294758;padding:20px}.oac-v2-aside h3{font-size:19px!important;margin:10px 0!important}.oac-v2-progress{margin:12px 0}.oac-v2-module{display:inline-flex;width:auto;margin:4px 5px 4px 0;padding:9px 10px;font-size:12px}.oac-v2-aside-tip{margin:8px 0 0}.oac-v2-main{padding:26px 23px}}@media(max-width:530px){.oac-v2-top{padding:12px 15px}.oac-v2-brand{font-size:9px}.oac-v2-main{padding:24px 16px}.oac-v2-controls{align-items:stretch}.oac-v2-controls .oac-v2-button{flex:1}.oac-v2-finish-panel{padding:17px}.oac-v2-finish-actions .oac-v2-button{width:100%}}

/* V0.3: interactive prompt laboratory, calculator and accessible video lessons. */
.oac-v2-app .oac-v3-prompt-form,.oac-v2-app .oac-v3-calculator{
  background:#132b3a;border:1px solid #315769;border-radius:16px;padding:clamp(17px,3vw,28px);margin:24px 0;color:#e6f5f1;
}
.oac-v2-app .oac-v3-prompt-form h3,.oac-v2-app .oac-v3-calculator h3{color:#f5fff5!important;font-size:20px;margin:0 0 18px}
.oac-v2-app .oac-v3-label{display:block;color:#d8e9eb;font-weight:650;font-size:14px;line-height:1.5;margin:14px 0}
.oac-v2-app .oac-v3-label>span{display:block;margin-bottom:7px}
.oac-v2-app .oac-v3-label textarea{min-height:72px!important;max-width:100%;font-size:15px}
.oac-v2-app .oac-v3-prompt-preview{padding:18px;background:#0d2331;border:1px solid #497067;border-radius:12px;margin-top:22px;max-width:100%}
.oac-v2-app .oac-v3-prompt-preview strong{color:#c9ef82;font-size:15px}
.oac-v2-app pre.oac-v3-prompt-text,.oac-v2-app pre.oac-v3-recap{white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;font-family:inherit;font-size:14px;line-height:1.75;background:#132f3e;color:#edfff6;border-radius:10px;padding:17px;margin:13px 0 15px}
.oac-v2-app .oac-v3-note{font-size:12px;line-height:1.65;color:#b3cbd0;margin:12px 0!important}
.oac-v2-app .oac-v3-calc-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.oac-v2-app .oac-v3-number,.oac-v2-app .oac-v3-fill{display:block;width:100%;max-width:100%;border:1px solid #557c8b;background:#f7ffff;color:#1a3442;border-radius:9px;padding:14px;font:inherit;font-size:17px}
.oac-v2-app .oac-v3-number{font-size:15px}
.oac-v2-app .oac-v3-calc-result{font-size:18px;font-weight:750;line-height:1.6;padding:17px;border-radius:10px;background:#1c3d3b;color:#e5ffbe;margin:20px 0!important}
.oac-v2-app .oac-v3-video-block{margin:22px 0 27px}
.oac-v2-app .oac-v3-video{width:100%;height:auto;max-height:460px;display:block;border-radius:12px;background:#000}
.oac-v2-app .oac-v3-transcript{background:#193443;border:1px solid #416174;border-radius:10px;margin-top:13px;padding:10px 16px;color:#f0f9fa}
.oac-v2-app .oac-v3-transcript summary{cursor:pointer;font-weight:650;padding:5px 0}
.oac-v2-app .oac-v3-transcript .oac-v2-body{font-size:15px;margin:13px 0 10px;line-height:1.75}
.oac-v2-app .oac-v3-fill{margin:15px 0 24px}
.oac-v2-app .oac-v3-prompt-form :focus-visible,.oac-v2-app .oac-v3-calculator :focus-visible,.oac-v2-app .oac-v3-fill:focus-visible{outline:3px solid #c9ef82;outline-offset:3px}
@media(max-width:600px){
 .oac-v2-app .oac-v3-calc-grid{grid-template-columns:1fr}
 .oac-v2-app .oac-v3-prompt-preview{padding:12px}
 .oac-v2-app .oac-v3-prompt-form,.oac-v2-app .oac-v3-calculator{padding:16px}
}