:root{--ink:#172f3d;--muted:#536a73;--paper:#f3f5f3;--nav:#15343b;--accent:#12675f;--accent-light:#e6f0eb;--orange:#ba4b28;--line:#d6e0dc;--white:#fff;--warning:#fff3dc;--shadow:0 5px 24px #163b3210;color-scheme:light}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.65 'Segoe UI',Arial,sans-serif}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{color:#083f3a}button,input,select,textarea{font:inherit}button,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 18px;border:1px solid var(--accent);border-radius:7px;background:var(--accent);color:white;text-decoration:none;font-weight:600;cursor:pointer;line-height:1.4}button:hover,.button:hover{background:#094e48;color:white}button:disabled{opacity:.5;cursor:not-allowed}.quiet{background:white;color:var(--ink);border-color:#bccdc6;font-weight:500}.quiet:hover{background:var(--accent-light);color:var(--ink)}.danger{color:#943820}.danger:hover{background:#fff0e9}input:not([type=checkbox]):not([type=radio]),select,textarea{display:block;width:100%;min-width:0;min-height:44px;margin-top:6px;border:1px solid #9bb1a8;border-radius:6px;padding:9px 11px;background:white;color:var(--ink)}input[type=checkbox],input[type=radio]{width:20px;height:20px;flex:0 0 20px;accent-color:var(--accent)}label{display:block;font-size:14px;font-weight:600}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid #cc642d;outline-offset:4px}#main:focus{outline:none}[hidden]{display:none!important}h1,h2,h3,p{overflow-wrap:break-word}h1{font-size:clamp(30px,3.1vw,43px);line-height:1.16;letter-spacing:-1.1px;margin:10px 0 22px;font-weight:650}h2{font-size:24px;line-height:1.35;letter-spacing:-.4px;margin:30px 0 16px;font-weight:650}h3{font-size:18px;line-height:1.4;margin:10px 0 15px}p{margin:10px 0 18px}small{display:block;font-size:12px;color:var(--muted)}.muted,.fineprint{color:var(--muted)}.fineprint{font-size:13px;line-height:1.6}.lead{font-size:18px;line-height:1.65;max-width:760px;color:var(--muted)}.eyebrow{color:var(--accent);font-size:11px;font-weight:700;letter-spacing:1.7px;text-transform:uppercase}.skip-link{position:fixed;left:16px;top:-90px;z-index:30;padding:12px 22px;background:#fff;color:var(--nav)}.skip-link:focus{top:12px}.rail{position:fixed;inset:0 auto 0 0;width:244px;background:var(--nav);color:#d7e5e0;padding:32px 22px;display:flex;flex-direction:column;overflow-y:auto;z-index:10}.brand{display:flex;align-items:center;gap:12px;color:#fff;text-decoration:none;font-size:17px;font-weight:600;line-height:1.35}.brand:hover{color:#fff}.brandmark{display:grid;place-items:center;flex-shrink:0;width:44px;height:48px;border:1px solid #769b8c;color:#d5e9df;border-radius:4px;font-size:16px;letter-spacing:1px}.rail-label{margin-top:42px;font-size:10px;text-transform:uppercase;letter-spacing:1.8px;color:#a9c3b8}.rail nav{display:grid;gap:7px}.rail nav a{display:block;color:#d4e4de;text-decoration:none;padding:11px 12px;font-size:14px;border-radius:6px;border-left:3px solid transparent}.rail nav a:hover,.rail nav a[aria-current=page]{background:#29494e;color:#fff}.rail nav a[aria-current=page]{border-left-color:#e9a46e}.rail-bottom{margin-top:auto;padding-top:60px;font-size:12px;line-height:1.65}.rail-bottom p{color:#a9c3b8}.workspace{margin-left:244px}.topbar{min-height:82px;padding:16px 38px;display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line);background:#fff;color:var(--muted);font-size:13px}.user-menu{display:flex;gap:20px;align-items:center}.user-menu>span{color:var(--ink);font-weight:600;line-height:1.4}.user-menu small{font-weight:400;margin-top:5px}main{max-width:1460px;margin:0 auto;padding:36px 38px 64px}footer{font-size:12px;padding:22px 38px;border-top:1px solid var(--line);color:var(--muted)}.back-link{display:inline-block;font-size:14px;margin-bottom:24px;text-decoration:none}.hero{display:grid;grid-template-columns:minmax(0,1.8fr) minmax(210px,1fr);background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:var(--shadow);margin-bottom:28px}.hero>div:first-child{padding:34px 38px}.hero .lead{font-size:19px}.hero-aside{display:flex;flex-direction:column;justify-content:center;align-items:flex-start;padding:34px;background:#e1ece4;border-left:1px solid var(--line);position:relative;overflow:hidden}.hero-aside::after{content:'';position:absolute;right:-40px;bottom:-30px;width:210px;height:200px;border:1px solid #a7c2af;transform:rotate(-25deg);pointer-events:none}.hero-number{font-size:84px;line-height:1;font-weight:300;letter-spacing:-6px;color:#285347}.hero-aside>span:not(.hero-number){font-size:14px;margin-top:14px;color:#315c4e;z-index:1}.hero-aside .hero-rule{font-size:11px!important;letter-spacing:.6px;padding-top:18px;border-top:1px solid #aac3b4}.panel{padding:26px 28px;background:#fff;border:1px solid var(--line);border-radius:10px;margin:22px 0;box-shadow:var(--shadow)}.panel>h2:first-child{margin-top:0}.panel>p:last-child{margin-bottom:0}.section-heading{display:flex;gap:20px;align-items:center;justify-content:space-between}.section-heading h2{margin-top:4px}.section-heading .badge{flex-shrink:0}.badge{display:inline-block;font-size:12px;font-weight:600;padding:4px 10px;border-radius:4px;background:var(--accent-light);color:#15594d}.meta{display:flex;gap:8px 22px;flex-wrap:wrap;font-size:12px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0}.stats.four{grid-template-columns:repeat(4,minmax(0,1fr))}.stat{padding:20px;background:#fff;border:1px solid var(--line);border-radius:8px}.stat strong{display:block;font-size:29px;line-height:1.35;letter-spacing:-.7px;font-weight:600}.stat span{display:block;margin-top:8px;font-size:12px;color:var(--muted)}.panel .stat{background:#f7f9f6}.progress-label{font-size:13px;font-weight:500;color:var(--muted)}progress,meter{display:block;width:100%;height:9px;margin:9px 0 0;accent-color:var(--accent);border:0;border-radius:5px}progress::-webkit-progress-bar{background:#e1e9e3;border-radius:5px}progress::-webkit-progress-value{background:var(--accent);border-radius:5px}progress::-moz-progress-bar{background:var(--accent)}.toolbar{display:flex;gap:12px;align-items:center;flex-wrap:wrap;margin:20px 0 0}.toolbar form{margin:0}.notice{padding:16px 20px;border-left:3px solid var(--accent);background:var(--accent-light);border-radius:0 7px 7px 0;margin:22px 0;font-size:14px}.notice h2{margin:0 0 12px;font-size:20px}.warning{background:var(--warning);border-color:#be771f;color:#674417}.error,.save-error{color:#a23625}.notice.error{background:#fff0eb;border-color:#b24731}.empty{padding:38px;text-align:center;color:var(--muted)}.empty h2{color:var(--ink)}.block-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin:22px 0}.block-grid>.panel{margin:0}.block-card{display:flex;flex-direction:column}.block-card>form{margin-top:auto;padding-top:20px}.lesson-list{list-style:none;padding:0;margin:4px 0}.lesson-list li{padding:14px 0;border-bottom:1px solid var(--line)}.lesson-list a{font-size:15px;font-weight:600}.lesson-list .meta{margin-top:6px}.table-wrap{overflow:auto;border:1px solid var(--line);border-radius:8px;margin:20px 0;background:white}table{width:100%;border-collapse:collapse;font-size:14px}th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}th{background:#edf2ee;font-size:12px;color:#34594b;font-weight:600}tr:last-child td,tr:last-child th{border-bottom:0}td small{margin-top:4px}.matrix th:not(:first-child),.matrix td{text-align:center;min-width:46px}.matrix th:first-child{min-width:180px}.matrix-pass{display:block;color:#116047;background:#e3f0e8;border-radius:3px;font-weight:700}details{margin:18px 0;padding:16px 20px;border:1px solid var(--line);border-radius:8px;background:#fff}summary{font-weight:600;cursor:pointer}details[open]>summary{margin-bottom:18px}.row-details{min-width:220px;padding:8px 0;border:0;margin:6px 0}.row-details summary{font-size:12px}.stack{display:grid;gap:18px}.stack>button{justify-self:start}.compact{gap:10px;min-width:180px}.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.check-label{display:flex;align-items:center;gap:10px;font-weight:400}.inline-form{display:flex;gap:14px;align-items:flex-end;flex-wrap:wrap}.inline-form>label,.inline-form>input{flex:1;min-width:190px}.inline-form>input{width:auto!important}.filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.filters .toolbar{margin:0;grid-column:1/-1}.chart-row{display:grid;grid-template-columns:160px 1fr 40px;align-items:center;gap:18px;margin:18px 0;font-size:13px}.chart-row meter{height:20px;margin:0}.profile-details{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.profile-details dt{font-size:12px;color:var(--muted)}.profile-details dd{margin:4px 0;font-size:16px;overflow-wrap:anywhere}.result-hero{display:flex;align-items:center;gap:36px}.result-hero h2{margin-top:0}.result-number{font-size:66px;font-weight:400;letter-spacing:-3px;color:var(--accent);white-space:nowrap}.result-number span{font-size:28px;letter-spacing:0}.answer-key{font-size:13px;overflow-wrap:anywhere}.article-text{white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.9;font-size:15px}.question-card{min-width:0;margin:28px 0}.question-card legend{font-size:12px;text-transform:uppercase;letter-spacing:1px;font-weight:700;color:var(--accent);padding:0 10px}.question-card h2{font-size:20px;margin-top:5px;line-height:1.5;white-space:pre-line}.question-context{padding:18px;background:#edf3ee;border-radius:6px;white-space:pre-line;font-size:14px}.question-meta{font-size:12px;color:var(--muted)}.answer-option{display:flex;gap:12px;align-items:flex-start;padding:13px 15px;border:1px solid var(--line);border-radius:6px;margin:10px 0;font-weight:400;cursor:pointer;transition:border-color .15s}.answer-option:hover{background:#f2f7f2;border-color:#90b6a0}.answer-option:has(input:checked){border-color:var(--accent);background:#edf5ef}.answer-option input{margin-top:3px}.match-row{display:grid;grid-template-columns:minmax(0,1fr) minmax(160px,1fr);align-items:center;gap:18px;margin:16px 0}.order-choices{padding-left:24px;font-size:14px}.order-choices li{margin:12px 0}.assessment-toolbar{position:sticky;bottom:0;border:1px solid var(--line);background:#fff;padding:18px 24px;box-shadow:0 -5px 25px #17362b10;border-radius:8px;z-index:2}.assessment-toolbar #save-state{font-weight:600;font-size:14px;margin:0}.assessment-toolbar #answer-count{font-size:12px;color:var(--muted)}.assessment-toolbar .fineprint{margin-bottom:0}.assessment-toolbar .toolbar{margin-top:12px}.auth-panel,.auth-card{max-width:620px;margin:24px auto}.auth-panel h1,.auth-card h1{font-size:32px}.auth-panel form,.auth-card form{display:grid;gap:18px}.auth-panel ul,.auth-card ul{font-size:14px}.errorlist{color:#a23625;margin:8px 0;padding-left:20px;font-size:14px}.helptext{color:var(--muted);font-size:12px;display:block;margin-top:5px}
/* Existing authored lesson renderer: its illustrations and learning rhythm. */
.lesson{max-width:1040px;padding:36px 42px}.lesson-opening h1{font-size:34px}.learning-goal{padding:16px 20px;background:#e6f1ed;border-radius:8px}.lesson-jumps{display:flex;gap:8px;flex-wrap:wrap;padding:14px 0;margin:18px 0 28px;border-bottom:1px solid var(--line)}.lesson section[id]{scroll-margin-top:20px}.explanation-step{display:grid;grid-template-columns:42px 1fr;gap:16px;margin:22px 0}.explanation-step h3{margin-top:0}.step-index{color:var(--accent);font-size:24px;font-weight:650}.takeaway{border-left:4px solid var(--accent);padding:18px 22px;background:#edf5f1}.learning-figure{margin:22px 0 30px;padding:18px;background:#f3f7f5;border:1px solid #dae7e1;border-radius:12px}.learning-figure img{display:block;width:100%;height:auto;max-height:620px;object-fit:contain}.learning-figure figcaption{font-size:15px;color:#49626a;margin:12px 4px 0;line-height:1.55}.learning-figure button{margin:10px 4px 0}.site-context img{display:block;width:100%;border-radius:8px;margin-top:14px}.site-context p,.example-assumption{font-size:14px;color:var(--muted)}.worked-example{background:#f6f4ef;border:1px solid #e6ddcd;border-radius:12px;padding:26px;margin:38px 0}.worked-example h2{margin-top:8px}.worked-steps{padding-left:26px}.worked-steps li{padding:10px 0 10px 8px}.example-result{background:#e4eee8;padding:16px 20px;border-radius:8px}.mistake{border-left:4px solid #b57a20;padding:4px 22px;background:#fff8e9;margin:30px 0}.mistake h2{margin-top:16px}.work-transfer{border-top:1px solid var(--line);margin-top:30px}.lesson-opening,.explanation-step,.worked-example{overflow-wrap:anywhere}.figure-dialog{max-width:95vw;max-height:92vh;width:1000px;border:1px solid #a9c6bd;border-radius:14px;padding:20px;color:var(--ink)}.figure-dialog::backdrop{background:#142b37c9}.figure-pan{overflow:auto;max-height:72vh}.figure-pan img{display:block;width:100%;min-width:760px}.figure-dialog p{font-size:14px}.process-figure{padding:10px;background:#fff}.process-figure img{max-height:none;object-fit:initial;max-width:880px;margin:0 auto}.process-figure figcaption{margin-top:14px}
@media(min-width:1500px){main{padding:42px 54px 70px}.topbar{padding-right:54px;padding-left:54px}}@media(max-width:1100px){.rail{width:214px;padding:26px 16px}.workspace{margin-left:214px}main{padding:30px 24px 54px}.topbar{padding:16px 24px}.hero>div:first-child{padding:26px}.hero-aside{padding:24px}.stats.four{grid-template-columns:repeat(2,minmax(0,1fr))}.filters{grid-template-columns:repeat(2,minmax(0,1fr))}.panel{padding:23px}.lesson{padding:28px}.stat{padding:16px}.stat strong{font-size:26px}}
@media(max-width:760px){.rail{position:static;width:auto;padding:18px 20px;overflow:visible}.brand{font-size:15px}.brandmark{width:38px;height:40px}.rail>.rail-label,.rail-bottom{display:none}.rail nav{display:flex;overflow-x:auto;gap:8px;margin-top:18px;padding-bottom:2px}.rail nav a{font-size:12px;white-space:nowrap;padding:8px 10px}.workspace{margin-left:0}.topbar{padding:12px 20px;min-height:64px;flex-wrap:wrap;gap:12px}.topbar>span{font-size:12px}.user-menu{margin-left:auto;gap:12px}.user-menu>span{max-width:180px}.user-menu .quiet{font-size:12px;padding:7px 10px;min-height:38px}main{padding:26px 18px 44px}h1{font-size:32px}h2{font-size:22px}.hero{grid-template-columns:1fr}.hero>div:first-child{padding:24px}.hero-aside{display:none}.hero .lead{font-size:17px}.block-grid{grid-template-columns:1fr}.stats{gap:8px}.stat{padding:12px}.stat strong{font-size:22px}.stat span{font-size:11px}.section-heading{align-items:flex-start;flex-wrap:wrap;gap:8px}.panel{padding:21px 18px}.form-grid,.profile-details{grid-template-columns:1fr}.filters{grid-template-columns:repeat(2,minmax(0,1fr))}.chart-row{grid-template-columns:110px 1fr 25px;gap:10px;font-size:12px}.result-hero{align-items:flex-start;gap:12px;flex-direction:column}.result-number{font-size:54px}.table-wrap{max-width:100%}th,td{padding:12px;min-width:90px}.match-row{grid-template-columns:1fr;gap:2px}.assessment-toolbar{position:static;padding:18px}.assessment-toolbar .toolbar>*{width:100%}.question-card h2{font-size:18px}.answer-option{padding:12px 10px;font-size:14px}.lesson{padding:20px 16px}.lesson-opening h1{font-size:27px}.explanation-step{grid-template-columns:28px 1fr;gap:10px}.step-index{font-size:20px}.learning-figure{padding:6px;margin-left:-8px;margin-right:-8px}.learning-figure figcaption{font-size:14px;padding:6px}.worked-example{padding:18px 14px}.lesson-jumps .quiet{font-size:12px}.mistake{padding:4px 14px}.process-figure{overflow-x:auto}.process-figure img{min-width:640px}.process-figure figcaption,.process-figure button{max-width:calc(100vw - 64px)}footer{padding:20px}.back-link{margin-bottom:16px}}
@media(max-width:420px){.stats{grid-template-columns:1fr}.stats.four{grid-template-columns:repeat(2,minmax(0,1fr))}.stats:not(.four) .stat{display:flex;align-items:center;justify-content:space-between;gap:12px}.stats:not(.four) .stat span{margin-top:0}.filters{grid-template-columns:1fr}.user-menu{margin-left:0}.toolbar>.button{width:100%}.chart-row{grid-template-columns:95px 1fr 24px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
@media print{body{font:11pt/1.5 Georgia,serif;color:#000;background:#fff}.rail,.topbar,.skip-link,footer,.back-link,.toolbar,.filters,.assessment-toolbar,button,.lesson-jumps,form{display:none!important}.workspace{margin:0}main{max-width:none;padding:0}.panel,.stat,details{box-shadow:none;border-color:#bbb;break-inside:avoid}.panel{margin:14px 0;padding:16px}.hero{display:block;box-shadow:none}.hero-aside{display:none}.hero>div:first-child{padding:16px}.table-wrap{overflow:visible;border-color:#bbb}table{font-size:9pt}th,td{padding:7px;min-width:0!important}thead{display:table-header-group}.stats,.block-grid{gap:10px}.profile-details{grid-template-columns:repeat(2,1fr)}h1{font-size:25pt}h2{font-size:18pt;break-after:avoid}h3{break-after:avoid}a{color:#000;text-decoration:none}.badge{border:1px solid #999}.learning-figure img{min-width:0!important;max-width:100%}.process-figure{overflow:visible}.notice{border-color:#555}details> :not(summary){display:block!important}.feedback{break-inside:auto}.result-number{color:#000}.matrix-pass{color:#000;background:#eee}}

.card.auth-card{background:#fff;border:1px solid var(--line);border-top:4px solid var(--accent);border-radius:10px;padding:32px;box-shadow:var(--shadow)}.auth-card form>p{margin:0}.auth-card form>button{justify-self:start}.chart-detail{grid-column:2/-1;font-size:12px;color:var(--muted);margin-top:-10px}.repeat-link{display:block;margin-bottom:8px}

.training-check{margin-top:34px;padding:24px;background:#f1f6f1;border:1px solid var(--line);border-radius:8px}.training-check h2{margin-top:8px}.training-check fieldset{border:0;padding:0;margin:0 0 18px;min-width:0}.training-check legend{font-weight:600;margin-bottom:10px;line-height:1.65}.training-feedback{font-weight:500;margin-top:18px}.solution-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:15px;line-height:1.85}@media(max-width:760px){.training-check{padding:18px 12px}}@media print{.training-check form{display:block!important}}