.learning-heading{max-width:1000px}.learning-controls{display:grid;grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr);gap:18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px;margin:15px 0 22px}.course-count{color:var(--muted);font-size:.85rem;margin:18px 0 24px}.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-bottom:35px}.lesson-card{display:flex;flex-direction:column;min-width:0;background:#fff;border:1px solid var(--line);border-radius:15px;padding:25px}.lesson-card:hover{border-color:var(--primary);background:#f5f7ff}.lesson-card-top{display:flex;gap:12px;justify-content:space-between;align-items:center;margin-bottom:20px}.lesson-card .eyebrow{margin-bottom:12px;font-size:.64rem;line-height:1.6}.lesson-card h3{font-size:1.13rem;line-height:1.55;margin:0 0 15px}.lesson-card>p:not(.eyebrow){font-size:.94rem;color:var(--muted);line-height:1.85;margin:0 0 24px}.lesson-card-bottom{display:flex;gap:10px;flex-wrap:wrap;margin-top:auto}.lesson-status{font-size:.73rem;color:var(--muted);padding:4px 0;line-height:1.7}.lesson-status[data-state=ready]{color:#126b48;font-weight:700}.subject-lab-title{font-size:1.8rem;margin:10px 0 30px}.learning-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:55px;padding-bottom:45px}.lesson-article,.lesson-aside{min-width:0}.lesson-article h1{font-size:3rem;font-weight:800;letter-spacing:-.05em;line-height:1.22;margin:18px 0 28px;overflow-wrap:anywhere}.lesson-article h2{font-size:1.65rem;letter-spacing:-.025em;line-height:1.5;margin:0 0 20px}.lesson-article p{font-size:1rem;line-height:1.95}.lesson-anchor-nav{display:flex;gap:12px;flex-wrap:wrap;margin:25px 0 30px}.lesson-anchor-nav a{padding:9px 13px;border:1px solid #c7d4f0;border-radius:20px;font-size:.8rem;min-height:44px;display:flex;align-items:center;color:var(--primary);font-weight:600;background:var(--soft)}.lesson-principle{background:white;border:1px solid var(--line);border-radius:15px;padding:28px}.lesson-principle>p{margin:0;color:var(--ink)}.course-formula{overflow-x:auto;max-width:100%;font-size:1.75rem;margin:25px 0 0;padding:22px 8px;background:var(--soft);border-radius:10px;white-space:nowrap}.course-formula math{font-family:'Cambria Math',math;min-width:max-content}.lesson-diagram figcaption>strong{font-size:1rem}.lesson-diagram .diagram-flow strong{font-size:.88rem}.diagram-caption{font-size:.85rem!important;color:#dce6f9;margin:16px 0 0!important}.fraction-picture{display:grid;grid-template-columns:repeat(4,1fr);max-width:340px;gap:5px;margin-top:23px}.fraction-picture span{background:#ffad7f;border:1px solid #ffad7f;height:48px}.fraction-picture .unfilled{background:#1c3561;border-color:#92a7c9}.binary-picture,.data-picture{display:flex;gap:12px;margin-top:23px;flex-wrap:wrap}.binary-picture>span,.data-picture>span{background:#1c3561;border:1px solid #92a7c9;border-radius:8px;padding:12px 17px;font-size:1.4rem;font-weight:700}.binary-picture small{display:block;font-size:.78rem;margin-top:9px;color:#ffccb0}.lesson-practice{background:#fff;border:1px solid #bdcff4;border-top:4px solid var(--primary);border-radius:14px;padding:28px;margin:30px 0}.practice-question{color:var(--navy);font-weight:700}.lesson-practice label{display:block;font-size:.83rem;font-weight:700;line-height:1.8;margin:22px 0 10px}.lesson-practice textarea{display:block;width:100%;min-height:130px;background:var(--paper);border:1px solid #7b8ba9;border-radius:10px;padding:14px;font-size:16px;line-height:1.8;resize:vertical;color:var(--ink)}.practice-hint,.practice-solution{border-top:1px solid var(--line);padding:16px 0 5px;margin-top:16px}.practice-hint summary,.practice-solution summary{font-size:.9rem;cursor:pointer;min-height:44px;line-height:1.8;padding:10px 0;color:var(--primary);font-weight:700}.practice-solution .self-check{font-size:.85rem;color:var(--muted);border-left:3px solid var(--orange);padding:10px 16px}.lesson-recall{border-top:1px solid var(--line);padding:28px 0}.lesson-recall li{font-size:.97rem;line-height:1.9;margin-bottom:9px}.course-progress{background:var(--soft);border:1px solid #c2d2f5;border-radius:12px;padding:20px;margin-top:25px}.course-progress label{font-weight:700;display:block;font-size:.85rem;margin-bottom:14px}.course-progress select{width:100%;background:white;min-height:48px;border:1px solid #7b8ba9;border-radius:9px;padding:12px;font-size:16px;color:var(--ink)}.course-progress p{font-size:.82rem;line-height:1.85}.progress-feedback{color:var(--primary);font-size:.85rem;line-height:1.8}.lesson-next{display:flex;gap:14px;flex-wrap:wrap;margin-top:25px}.lesson-aside{padding-top:16px}.lesson-aside h2{font-size:1rem;margin:15px 0 20px}.lesson-aside nav{display:grid;gap:9px;max-height:540px;overflow-y:auto;margin-bottom:35px}.lesson-nav-item{display:block;font-size:.8rem;line-height:1.9;padding:11px 12px;border:1px solid var(--line);border-radius:8px;background:white}.lesson-nav-item.current{background:var(--soft);border-color:var(--primary);color:var(--primary);font-weight:700}.lesson-aside .tool-card{padding:22px;margin-bottom:28px}.lesson-aside .tool-card h3{font-size:1rem}.lesson-aside .tool-card p{font-size:.85rem}.path-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:25px 0 40px}.path-card{display:grid;grid-template-columns:42px minmax(0,1fr);gap:20px;padding:28px;border:1px solid var(--line);background:white;border-radius:15px}.path-card:hover{border-color:var(--primary)}.path-card h2{font-size:1.15rem;line-height:1.6;margin:0 0 14px}.path-card p{font-size:.95rem;color:var(--muted);line-height:1.9;margin:0 0 20px}.path-article{max-width:950px;margin:0 auto 30px}.path-article .article-step h2{font-size:1.35rem;margin:0 0 14px}.path-article .article-step p{font-size:1rem}.revision-summary{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin-bottom:30px}.revision-summary>div{padding:22px;border:1px solid #c8d5ef;background:var(--soft);border-radius:12px}.revision-summary strong{font-size:2.2rem;font-weight:800;color:var(--primary);display:block;margin-bottom:10px}.revision-summary span{font-size:.85rem;line-height:1.6}.revision-list{margin:30px 0}.revision-row{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:25px;padding:23px;background:white;border:1px solid var(--line);border-radius:12px;margin-bottom:12px;align-items:center}.revision-row a{font-size:1rem;font-weight:700;line-height:1.75;color:var(--navy)}.revision-row a:hover{color:var(--primary)}.revision-row p{font-size:.8rem;color:var(--muted);margin:8px 0 0;line-height:1.7}.revision-row select{font-size:16px;min-height:48px;border:1px solid #7b8ba9;border-radius:8px;padding:10px;background:var(--paper);width:100%;color:var(--ink)}.learning-controls select,.learning-controls input{min-width:0}.revision-dashboard{margin-top:20px}.home-learning-route{background:var(--navy);color:white;border-radius:20px;padding:35px;margin:20px 0 50px}.home-learning-route h2{font-size:2.1rem;line-height:1.5;margin:0 0 18px}.home-learning-route p{font-size:1rem;line-height:1.9;color:#dce6f9;max-width:800px}.home-learning-route .button{background:var(--orange);color:var(--navy);border-color:var(--orange)}.home-learning-route .button.secondary{background:transparent;color:white;border-color:#9aabc8}
@media(max-width:1050px){.learning-layout{gap:30px;grid-template-columns:minmax(0,1fr) 250px}.lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-article h1{font-size:2.6rem}}
@media(max-width:850px){.learning-layout{grid-template-columns:1fr}.lesson-aside{border-top:1px solid var(--line);padding-top:25px}.lesson-aside nav{grid-template-columns:1fr 1fr;max-height:none}.learning-controls{grid-template-columns:1fr 1fr}.learning-controls .field:first-child{grid-column:1/-1}.path-card{padding:23px;gap:14px}.revision-summary{gap:12px}.revision-summary>div{padding:17px}}
@media(max-width:660px){.learning-controls{grid-template-columns:1fr;padding:20px}.learning-controls .field:first-child{grid-column:auto}.lesson-grid,.path-grid{grid-template-columns:1fr}.lesson-card{padding:24px}.lesson-card>p:not(.eyebrow){font-size:1rem}.lesson-article h1{font-size:2.25rem}.lesson-article h2{font-size:1.45rem}.lesson-principle,.lesson-practice{padding:21px}.lesson-article p{font-size:1rem}.lesson-aside nav{grid-template-columns:1fr}.path-card p{font-size:1rem}.path-card{grid-template-columns:32px minmax(0,1fr);gap:12px;padding:23px}.revision-summary{grid-template-columns:1fr 1fr}.revision-summary strong{font-size:1.85rem}.revision-row{grid-template-columns:1fr;padding:20px;gap:17px}.lesson-anchor-nav{gap:8px}.lesson-anchor-nav a{font-size:.78rem;padding:8px 12px}.course-formula{font-size:1.5rem}.lesson-diagram .diagram-flow strong{font-size:.95rem}.home-learning-route{padding:25px}.home-learning-route h2{font-size:1.8rem}}
@media print{.learning-controls,.lesson-aside,.lesson-anchor-nav,.lesson-next,.course-progress,.lesson-practice textarea,.lesson-practice>label,.revision-row select{display:none!important}.learning-layout{display:block}.lesson-practice details{display:block}.lesson-practice details>p{display:block}.lesson-principle,.lesson-practice{border:1px solid #777;background:white}.lesson-article h1{font-size:24pt}.lesson-principle p,.lesson-practice p{font-size:11pt}.course-formula{background:white}.path-grid{grid-template-columns:1fr}}

.course-deep{padding:25px;border-left:4px solid var(--orange);background:#fff4ec;border-radius:0 12px 12px 0;margin:28px 0}.course-method{background:white;border:1px solid var(--line);border-radius:14px;padding:26px;margin:28px 0}.course-method ol{padding-left:25px}.course-method li{padding-left:6px;margin:20px 0}.course-method strong{font-size:.97rem;color:var(--primary)}.course-method p{margin:8px 0 0;font-size:.94rem}.concept-svg{display:block;width:100%;max-width:620px;margin:20px auto 0}.concept-svg text{font:16px sans-serif;fill:#f0f5ff}.concept-svg .accent{fill:#ffad7f}.concept-caption{color:#dce6f9;font-size:.87rem!important}

.course-tool-reference{display:flex;gap:16px;align-items:flex-start;padding:22px;margin:25px 0;background:var(--soft);border:1px solid var(--line);border-left:3px solid var(--primary);border-radius:12px}.course-tool-reference .tool-mark{flex:0 0 auto}.course-tool-reference>div{min-width:0}.course-tool-reference .eyebrow{margin:0 0 9px;font-size:.68rem}.course-tool-reference h3{font-size:1.08rem;line-height:1.6;margin:0 0 10px}.course-tool-reference p{font-size:.9rem;line-height:1.85;margin:0 0 14px}.course-tool-reference .field-hint{font-size:.78rem;margin:10px 0 0;color:var(--muted)}.course-tool-reference .text-link{min-height:44px;display:inline-flex;align-items:center;gap:8px}.practice-solution .course-tool-reference{margin-bottom:10px}