/* Match the PASS 2 website chrome; the lesson no longer owns another site header. */
.p3-workspace{--p3-ink:#302b40;--p3-muted:#7e758f;--p3-line:#e3ddeb;--p3-accent:#7059ab;background:#fff;color:var(--p3-ink);min-height:100vh;padding-bottom:100px;font-family:Inter,"Microsoft YaHei",system-ui,sans-serif}
body:has(.p3-workspace){background:#fff}body:has(.p3-workspace) .proto{display:none}
.p3-top{display:flex;align-items:center;gap:24px;padding:0 32px;height:76px;border-bottom:1px solid var(--p3-line);background:#fffffff5;position:sticky;top:0;z-index:50;backdrop-filter:blur(14px)}
.p3-brand{padding:0;border:0;background:none;color:var(--p3-ink);font:850 23px/1.1 Inter,system-ui,sans-serif;letter-spacing:-1px;min-width:125px;text-align:left;cursor:pointer}.p3-brand:first-letter{color:var(--p3-accent)}.p3-brand small{display:block;font-size:8px;letter-spacing:2px;font-weight:500;margin-top:8px}
.p3-context{flex:1;min-width:170px;border-left:1px solid var(--p3-line);padding-left:24px}.p3-context b{display:block;font-size:15px}.p3-context>span{display:block;font-size:12px;color:var(--p3-muted);margin-top:5px}.p3-context .zh{display:inline;font-size:inherit;margin-left:4px}
.p3-top nav{display:flex;align-items:center;gap:8px}.p3-top .btn{border:0;background:transparent;padding:8px 13px;font-size:13px;font-weight:400;color:var(--p3-ink);box-shadow:none}.p3-top .btn .zh{display:block;margin-top:2px;color:var(--p3-muted);font-size:11px}.p3-top .segmented{background:#f0ecf5;border:0;border-radius:9px;padding:3px}.p3-top .segmented button{border-radius:8px}.p3-top .segmented button[aria-pressed=true]{background:#fff;color:var(--p3-ink);box-shadow:0 1px 5px #20253918}
.p3-review-note{padding:8px 32px;background:#f7f5fb;color:#746489;font-size:12px;display:flex;justify-content:space-between;gap:12px}.p3-review-note a{color:#655094}.p3-review-note .zh{display:inline;margin-left:6px;font-size:inherit}

.p3-content{padding:24px 32px 8px;margin:0;width:100%;max-width:none}.p3-content iframe{display:block;border:0;width:100%;height:800px;background:#fff}
.p3-footer.learn-footer{position:fixed;inset:auto 0 0;z-index:50;display:flex;align-items:center;gap:24px;min-height:86px;padding:12px 28px;border-top:1px solid var(--p3-line);background:#fffffff5;backdrop-filter:blur(14px);box-shadow:none}.p3-footer .btn{font-size:12px;border-color:var(--p3-line);border-radius:11px;box-shadow:none}.p3-footer .btn.primary{background:var(--p3-accent);color:white;min-width:210px;padding:13px 20px}.p3-footer .btn.primary:disabled{background:#e9e6ef;color:#857e90;border-color:#e9e6ef}.p3-footer .zh{font-size:11px}.p3-footer .footer-status{flex:1;text-align:left;color:var(--p3-muted);font-size:12px}.p3-progress{min-width:215px;display:grid;grid-template-columns:1fr auto;gap:7px 15px;font-size:12px;color:#5d5277}.p3-progress strong{font-weight:600}.p3-progress strong .zh{display:none}.p3-progress-track{grid-column:1/-1;height:7px;background:#eeeaf5;border-radius:8px;overflow:hidden}.p3-progress-track i{display:block;height:100%;background:linear-gradient(90deg,#ac96d7,#7558ad);border-radius:8px}
.p3-workspace button:focus-visible,.p3-workspace a:focus-visible{outline:3px solid #9a86c9;outline-offset:3px}
@media(max-width:1050px){.p3-top{padding:0 20px;gap:14px}.p3-context{padding-left:14px}.p3-top nav{gap:2px}.p3-top .btn{padding:8px}.p3-content{padding:20px}.p3-footer .footer-status{font-size:11px}.p3-footer{gap:14px!important}}
@media(max-width:760px){.p3-top{height:auto;flex-wrap:wrap;padding:12px 16px;gap:12px}.p3-brand{min-width:105px;font-size:21px}.p3-context{min-width:0}.p3-context b{font-size:13px}.p3-top nav{width:100%;justify-content:space-between}.p3-top .btn{font-size:11px;padding:6px}.p3-top .btn .zh{font-size:10px}.p3-content{padding:16px 12px}.p3-review-note{padding:7px 16px;flex-wrap:wrap}.p3-review-note .zh{margin-left:0}.p3-review-note>span{display:none}.p3-footer.learn-footer{display:grid;grid-template-columns:90px 1fr;padding:10px 14px;gap:8px!important}.p3-footer .footer-status{display:none}.p3-progress{min-width:0}.p3-footer #real-next{grid-column:1/-1;min-width:0;width:100%;padding:9px}.p3-workspace{padding-bottom:150px}}
.p3-content:focus{outline:none}
@media(max-width:760px){
 body .p3-workspace .p3-top nav .segmented{flex:none;white-space:nowrap}
 body .p3-workspace .p3-top nav>.btn{white-space:nowrap;padding:6px 4px;font-size:11px}
 body .p3-workspace .p3-footer.learn-footer{display:grid!important;grid-template-columns:92px minmax(0,1fr)!important;grid-template-areas:"previous progress" "next next";gap:8px 14px!important;padding:10px 14px!important}
 body .p3-workspace .p3-footer>span{grid-area:previous;min-width:0;width:auto}
 body .p3-workspace .p3-footer>span .btn{min-width:0;width:100%;padding:8px;white-space:nowrap;font-size:11px}
 body .p3-workspace .p3-footer .footer-status{display:none!important}
 body .p3-workspace .p3-footer .p3-progress{grid-area:progress;min-width:0}
 body .p3-workspace .p3-footer #real-next{grid-area:next;min-width:0;padding:9px 12px}
 body .p3-workspace .p3-review-note>span{display:inline;font-size:11px}
}

.p3-step-heading{padding:20px 32px 0;color:#514363}
.p3-step-heading p{margin:0 0 5px;font-size:11px;font-weight:600;letter-spacing:.035em;color:#8b7f9c}
.p3-step-heading h1{margin:0;font-size:19px;font-weight:650;line-height:1.4;color:#393044}
.p3-step-heading .zh{display:inline;margin-left:6px;font-size:inherit;font-weight:400}
.p3-step-heading+.p3-content{padding-top:16px}
@media(max-width:760px){.p3-step-heading{padding:16px 14px 0}.p3-step-heading h1{font-size:17px}.p3-step-heading p .zh{display:none}}