:root{--ink:#223f35;--muted:#687971;--green:#174d3c;--leaf:#2e7158;--mint:#e7f0e8;--gold:#bb8a36;--cream:#f6f5ef;--line:#dce3da;--white:#fff;--red:#a63632;--radius:18px;--shadow:0 8px 28px #183d2910;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--cream);font-size:15px;line-height:1.7}*{box-sizing:border-box}body{margin:0}a{color:var(--green);text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid #d6a448;outline-offset:3px}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(25px,3vw,36px);line-height:1.35;letter-spacing:-.5px;margin-bottom:12px}h2{font-size:22px;line-height:1.45;margin-bottom:15px}h3{font-size:17px;margin-bottom:10px}p{margin-bottom:12px}small,.muted{color:var(--muted)}hr{border:0;border-top:1px solid var(--line);margin:24px 0}.brand{display:flex;align-items:center;gap:11px;min-width:0}.brand img{width:45px;height:45px;object-fit:contain;border-radius:50%;background:white}.brand strong{display:block;font-size:17px;letter-spacing:.5px}.brand small{display:block;font-size:11px;letter-spacing:1px}.topbar{background:#fff;border-bottom:1px solid var(--line);padding:15px 4vw;display:flex;align-items:center;justify-content:space-between;gap:18px}.top-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.user-name{font-size:13px;color:var(--muted)}.portal-tag,.badge{border-radius:99px;padding:3px 10px;display:inline-flex;font-size:12px;background:var(--mint);color:var(--green);font-weight:600}.badge.warn{background:#fff2d7;color:#906016}.badge.grey{background:#eef0ed;color:#657169}.badge.error{background:#fbeae7;color:var(--red)}.shell{display:grid;grid-template-columns:212px minmax(0,1fr);min-height:calc(100vh - 80px)}.sidebar{padding:30px 18px;border-right:1px solid var(--line);background:#fafaf6;display:flex;flex-direction:column;gap:6px}.nav-label{font-size:11px;letter-spacing:2px;color:#929b92;padding:0 14px;margin-bottom:9px}.nav-item{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:11px;color:var(--muted);font-size:14px}.nav-item:hover{background:#edf1e9;color:var(--green)}.nav-item.active{background:var(--green);color:#fff;font-weight:600}.nav-icon{font-size:16px;display:inline-grid;width:24px;place-items:center}.sidebar-foot{font-size:12px;color:var(--muted);margin-top:auto;padding:36px 14px 0}.content{padding:32px clamp(20px,3.5vw,54px) 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var(--green);background:var(--green);color:#fff;border-radius:10px;padding:10px 18px;display:inline-flex;align-items:center;justify-content:center;gap:8px;line-height:1.5;font-weight:600;font-size:14px;text-align:center}.button:hover{filter:brightness(1.07)}.button.secondary{background:#fff;color:var(--green);border-color:var(--line)}.button.soft{background:var(--mint);border-color:var(--mint);color:var(--green)}.button.danger{background:#fff;color:var(--red);border-color:#e8ccc6}.button.small{font-size:12px;padding:7px 11px;border-radius:8px}.button.link{border:0;background:transparent;color:var(--green);padding:5px}.button.block{width:100%}.actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:18px}.stat{font-size:32px;font-weight:700;color:var(--green);line-height:1.2;margin:12px 0 7px}.stat-label{color:var(--muted);font-size:13px}.section-title{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:30px 0 14px}.section-title h2{margin:0}.course-card{display:flex;flex-direction:column;gap:12px}.course-card h3{font-size:21px;margin:0}.course-card p{color:var(--muted);font-size:13px}.course-card .actions{margin-top:auto}.progress{height:7px;overflow:hidden;background:#eef2ec;border-radius:50px;margin:9px 0}.progress>i{display:block;height:100%;background:var(--leaf);border-radius:50px}.notice{padding:13px 17px;border-left:3px solid var(--gold);background:#fcf5e5;border-radius:0 9px 9px 0;color:#785d2c;font-size:13px;margin:16px 0}.error-box{border:1px solid #edcbc1;background:#fff1ed;border-radius:10px;padding:13px 16px;color:var(--red);margin:14px 0;font-size:14px}.success-box{background:var(--mint);padding:14px;border-radius:10px;color:var(--green)}.empty{text-align:center;padding:44px 20px;color:var(--muted)}.empty strong{display:block;color:var(--ink);font-size:18px;margin-bottom:7px}.list-row{display:flex;justify-content:space-between;align-items:center;gap:16px;padding:17px 0;border-bottom:1px solid 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textarea{display:block;width:100%;border:1px solid #cdd8ce;border-radius:9px;padding:11px 12px;background:#fff;color:var(--ink);margin-top:6px;font-size:14px;min-height:45px;font-weight:400}.field textarea{resize:vertical;min-height:100px}.field small{display:block;margin-top:5px;font-size:12px;font-weight:400}.form-grid .field{margin-bottom:0}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}.tabs a{padding:8px 15px;background:white;border:1px solid var(--line);border-radius:99px;font-size:13px}.tabs a.active{background:var(--green);color:white;border-color:var(--green)}.feedback{border-left:3px solid var(--leaf);padding:12px 16px;background:#f0f5ef;margin-top:12px;border-radius:0 9px 9px 0}.feedback p{white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:7px}.feedback small{font-size:12px}.loading-screen{padding:100px 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.portal-icon{width:44px;height:44px;display:grid;place-items:center;border-radius:13px;background:var(--mint);font-size:23px;margin-bottom:22px}.portal-card p{font-size:14px;color:var(--muted);margin-bottom:25px}.portal-card .button{align-self:flex-start;margin-top:auto}.welcome-footer{font-size:12px;color:var(--muted);margin-top:34px}.auth-wrap{min-height:calc(100vh - 79px);display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:50px;max-width:1100px;padding:55px 35px;margin:auto}.auth-aside h1{font-size:42px;line-height:1.5}.auth-aside p{color:var(--muted);max-width:360px}.auth-card{padding:36px}.auth-card h2{margin-bottom:5px}.auth-card .intro{font-size:13px;color:var(--muted);margin-bottom:27px}.password-wrap{max-width:530px;padding:40px 20px;margin:auto}.ticket-layout{display:grid;grid-template-columns:minmax(0,1fr) 345px;gap:20px;align-items:start}.ticket-paper{padding:0 20px;max-height:68vh;overflow:auto;overscroll-behavior:contain}.ticket-step{padding:14px 0;border-bottom:1px solid var(--line);display:flex;gap:12px;align-items:flex-start}.step-index{font-size:12px;background:#edf1ea;min-width:25px;height:25px;display:grid;place-items:center;border-radius:7px;color:var(--muted);margin-top:2px}.step-text{font-size:14px;white-space:pre-wrap;overflow-wrap:anywhere;flex:1}.ticket-step.blank{background:#fafbf7;margin:0 -10px;padding:14px 10px}.ticket-step.blank.active{background:#edf5e9;border-left:3px solid var(--leaf)}.slot-wrap{flex:1;min-width:0}.ticket-slot{display:block;width:100%;background:#fff;border:1px dashed #a3b29d;border-radius:9px;text-align:left;color:var(--green);padding:11px;font-size:14px;line-height:1.7}.ticket-slot.filled{border-style:solid;border-color:#a1b79f;background:#f7faf4}.ticket-slot:disabled{opacity:1}.slot-caption{font-size:11px;color:var(--muted);margin-bottom:5px}.slot-clear{padding:3px 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0;overflow-wrap:anywhere}.wrap-text{white-space:pre-wrap;overflow-wrap:anywhere}.modal-backdrop{position:fixed;inset:0;background:#102f2480;z-index:30;padding:20px;display:grid;place-items:center}.modal{background:white;border-radius:18px;padding:28px;max-width:580px;max-height:90vh;overflow:auto;width:100%}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}
@media(min-width:1600px){.content{padding-top:42px}}@media(max-width:1100px){.shell{grid-template-columns:175px minmax(0,1fr)}.content{padding:26px 22px 50px}.sidebar{padding:26px 11px}.ticket-layout{grid-template-columns:minmax(0,1fr) 300px}.grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}.grid.three>.card:last-child:nth-child(odd){grid-column:span 2}.brand small{letter-spacing:0}.ticket-side.card{padding:13px}}
@media(max-width:760px){.topbar{padding:12px 16px;gap:10px}.brand img{width:37px;height:37px}.brand strong{font-size:15px}.brand small{font-size:10px}.top-actions{gap:7px}.user-name{display:none}.portal-tag{font-size:11px}.shell{display:block;min-height:auto}.sidebar{padding:10px 12px;display:flex;flex-direction:row;border-right:0;border-bottom:1px solid var(--line);overflow:auto;gap:5px}.nav-label,.sidebar-foot{display:none}.nav-item{white-space:nowrap;padding:9px 12px;font-size:13px;gap:5px}.nav-icon{width:18px;font-size:14px}.content{padding:24px 16px 45px}.page-head{gap:12px;margin-bottom:18px;flex-wrap:wrap}.card{padding:20px}.grid.two,.grid.three{grid-template-columns:1fr}.grid.three>.card:last-child:nth-child(odd){grid-column:auto}.hero{padding:24px}.stat{font-size:29px}.grid.stats{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.stats .card{padding:14px 9px}.stats .stat-label{font-size:11px}.stats .stat{font-size:25px}.auth-wrap{display:block;padding:35px 20px}.auth-aside h1{font-size:29px}.auth-aside p{display:none}.auth-card{padding:25px}.auth-aside{margin-bottom:25px}.welcome{padding:32px 20px}.welcome-title{margin-top:12px}.welcome-title p{font-size:15px}.portal-card{min-height:auto;padding:25px}.portal-card .portal-icon{margin-bottom:15px}.form-grid{grid-template-columns:1fr}.ticket-layout{grid-template-columns:1fr}.ticket-side{grid-row:1;position:static}.ticket-options{max-height:52vh}.ticket-paper{max-height:55vh}.list-row{align-items:flex-start;gap:10px}.list-row .button{white-space:nowrap;font-size:12px;padding:8px 10px}.source-preview{padding:10px}.source-preview .source-head{font-size:12px}.section-title h2{font-size:20px}.reading{line-height:1.85}}

/* Keep keyboard-only skip control truly hidden in full-page captures and align ticket columns. */
.skip-link:not(:focus){clip-path:inset(100%);width:1px;height:1px;overflow:hidden;padding:0}
.ticket-layout>.card{margin-top:0}

/* Lesson content hierarchy: original source first, supporting interpretation second. */
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5px);height:22px;color:#74925a;font-size:17px}.diagram-nodes.compare{gap:10px}.diagram-nodes.compare>li:nth-child(even){background:#fffaf0;border-color:#e5ddc3}.diagram-boundary{font-size:10px;color:#80916f;margin:13px 0 0}.teaching-pitfall{padding:16px;margin:18px 0;border-left:3px solid #c6a463;background:#faf4e6;border-radius:0 10px 10px 0}.teaching-pitfall h3{font-size:14px;color:#84652e;margin-bottom:10px}.teaching-pitfall p.pitfall-question{font-weight:600;color:#806339;font-size:13px}.teaching-self-check{margin-top:22px;padding-top:19px;border-top:1px solid #dce4d2}.self-check-heading{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:10px}.self-check-heading h3{font-size:15px;margin:0}.self-check-heading .badge{font-size:10px;white-space:nowrap}.self-check-question{font-size:14px}.self-check-details{margin-top:12px;background:white;border:1px solid #dae4d0;border-radius:9px;overflow:hidden}.self-check-details summary{padding:11px 13px;font-size:12px;color:var(--green);cursor:pointer;font-weight:600;line-height:1.65}.self-check-details summary:focus-visible{outline:3px solid var(--gold);outline-offset:-3px}.self-check-details[open] summary{border-bottom:1px solid #e2e8db;background:#f5f8f0}.self-check-answer{padding:14px}.self-check-answer p{font-size:13px}.teaching-version{font-size:10px;color:#89927f;margin:20px 0 0}.lesson-completion{margin-top:24px!important}.lesson-completion h2{font-size:20px;margin:0 0 7px}.lesson-completion .muted{font-size:13px}.lesson-completion .actions{margin-top:12px}
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