:root{--ink:#233d37;--muted:#6c7b73;--green:#28634d;--line:#e0e5dc;--paper:#fffefb;--bg:#f4f5ee;--soft:#eaf0e5;--orange:#e7a86c;font-family:Inter,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--bg);font-size:15px;line-height:1.6}*{box-sizing:border-box}body{margin:0}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}button,input,textarea,select{font:inherit}button,a,input,textarea,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.5;cursor:wait}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible,.tiptap:focus-visible{outline:3px solid #d59c56;outline-offset:3px}.topbar{min-height:84px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:18px 4vw;background:var(--paper);gap:24px}.brand{display:flex;align-items:center;gap:12px;font-size:18px;font-weight:700;letter-spacing:-.4px;color:var(--ink)}.brand-icon{background:var(--green);color:#fff;border-radius:11px;padding:2px 10px;font-size:24px}.topbar nav{display:flex;align-items:center;gap:24px;font-size:14px}.topbar form{margin:0}.username{border-left:1px solid var(--line);padding-left:24px}.container{max-width:1300px;margin:auto;padding:48px 40px;min-height:calc(100vh - 170px)}h1,h2,h3{line-height:1.22;letter-spacing:-.6px}h1{font-size:38px;font-weight:650;margin:12px 0 16px}h2{font-size:23px;font-weight:650}p{margin:12px 0}.muted,.hint{color:var(--muted)}.hint{display:block;font-size:13px}.small{font-size:13px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:1.8px;color:var(--green)}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:44px}.page-heading p{max-width:640px}.button{display:inline-flex;align-items:center;justify-content:center;gap:24px;background:var(--green);color:white;border:1px solid var(--green);border-radius:8px;padding:11px 19px;font-weight:600;font-size:14px;white-space:nowrap;text-decoration:none}.button:hover{background:#1b4a39;text-decoration:none}.button.secondary{background:transparent;color:var(--green);border-color:#ccd7ca}.button.secondary:hover{background:var(--soft)}.text-button{background:none;border:0;color:var(--muted);padding:7px;font-size:14px}.subtle{font-size:13px;text-decoration:underline;text-underline-offset:4px}.section-label{font-size:11px;font-weight:750;letter-spacing:1.5px;margin-bottom:20px;display:flex;align-items:center;gap:10px}.section-label span{background:#e3e9dd;border-radius:5px;padding:0 6px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.course-card{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--paper)}.course-art{height:155px;position:relative;padding:24px;background:#e3ebdc;overflow:hidden}.course-card:nth-child(3n+2) .course-art{background:#f0e2cc}.course-card:nth-child(3n+3) .course-art{background:#dfe9eb}.course-art:after{content:'';position:absolute;border:1px solid #6d8a6740;border-radius:50%;height:210px;width:210px;right:-45px;top:-80px;box-shadow:0 0 0 22px #6d8a6710,0 0 0 44px #6d8a6710}.course-number{font-size:52px;font-weight:300;letter-spacing:-3px;line-height:1}.art-caption{display:block;font-size:9px;font-weight:700;letter-spacing:1.6px;margin-top:22px}.art-mark{position:absolute;right:28px;bottom:16px;font-size:36px}.card-body{padding:25px}.card-meta{font-size:12px;color:var(--muted);display:flex;justify-content:space-between}.badge{background:var(--soft);color:var(--green);padding:0 8px;border-radius:12px}.card-body h2{margin:14px 0}.course-description{font-size:14px;min-height:48px;overflow-wrap:anywhere}.progress-label{display:flex;justify-content:space-between;margin-top:30px;font-size:12px}.progress-label strong{color:var(--green)}progress{appearance:none;display:block;height:5px;width:100%;border:0;background:#e5e9df;border-radius:4px;margin:10px 0 24px}progress::-webkit-progress-bar{background:#e5e9df;border-radius:4px}progress::-webkit-progress-value{background:var(--green);border-radius:4px}progress::-moz-progress-bar{background:var(--green);border-radius:4px}.card-actions{display:flex;flex-direction:column;align-items:stretch;gap:13px}.card-actions .subtle{text-align:center}.auth-card{max-width:450px;padding:38px;border:1px solid var(--line);border-radius:16px;background:var(--paper);margin:30px auto}.auth-card.wide{max-width:640px}label{display:block;font-weight:600;font-size:14px;margin-bottom:6px}input:not([type=checkbox]):not([type=hidden]),textarea,select{width:100%;padding:11px 13px;border:1px solid #cfd8cc;border-radius:7px;background:var(--paper);color:var(--ink);min-width:0}textarea{min-height:130px}input[type=checkbox]{width:18px;height:18px;accent-color:var(--green)}.helptext{font-size:12px;color:var(--muted);display:block;margin-top:5px}.helptext ul{padding-left:20px}.errorlist{color:#a53b2b;font-size:13px;padding-left:20px}.auth-card .button{width:100%;margin:10px 0}.notice{padding:18px 22px;border:1px solid #c4d7ba;background:#edf4e8;border-radius:9px;margin-bottom:24px}.back{display:inline-block;font-size:13px;color:var(--muted);margin-bottom:22px}.panel{background:var(--paper);padding:30px;border:1px solid var(--line);border-radius:12px}.list-row{display:flex;align-items:center;gap:20px;padding:20px 0;border-bottom:1px solid var(--line)}.list-row:last-child{border-bottom:0}.grow{flex:1;min-width:0;overflow-wrap:anywhere}.row-number,.avatar{display:flex;align-items:center;justify-content:center;background:var(--soft);height:40px;min-width:40px;border-radius:10px;color:var(--green);font-weight:650}.list-row form{display:flex;gap:12px;align-items:center}.lesson-layout{display:grid;grid-template-columns:265px minmax(0,1fr);gap:40px;align-items:start}.lesson-menu{border:1px solid var(--line);border-radius:10px;overflow:hidden;background:var(--paper);position:sticky;top:24px}.lesson-menu summary{display:flex;justify-content:space-between;font-weight:650;font-size:14px;padding:18px;cursor:pointer;border-bottom:1px solid var(--line)}.lesson-menu summary::-webkit-details-marker{display:none}.lesson-nav{display:flex;gap:12px;padding:16px;color:var(--muted);font-size:13px;border-left:3px solid transparent}.lesson-nav:hover{background:#f4f6ef;text-decoration:none}.lesson-nav.active{background:var(--soft);color:var(--green);border-left-color:var(--green);font-weight:650}.lesson-nav small{display:block;font-weight:400}.lesson-status{min-width:22px;font-size:12px}.lesson-main{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:32px;min-width:0}.lesson-heading{display:flex;align-items:center;justify-content:space-between;gap:14px}.lesson-main h1{font-size:32px;margin-bottom:26px}.video-frame{aspect-ratio:16/9;background:#1f302a;border-radius:9px;overflow:hidden}.video-frame iframe{border:0;height:100%;width:100%}.video-caption{display:flex;justify-content:space-between;gap:20px;font-size:11px;color:var(--muted);margin:10px 0 32px}.lesson-content{overflow-wrap:anywhere;line-height:1.85}.lesson-content h2{margin-top:32px}.lesson-content h3{font-size:20px;margin-top:26px}.lesson-content img{display:block;max-width:100%;height:auto;border-radius:7px;margin:20px 0}.lesson-content table{border-collapse:collapse;display:block;max-width:100%;overflow-x:auto;margin:20px 0}.lesson-content td,.lesson-content th{border:1px solid #cfd8cc;padding:10px;min-width:60px}.lesson-content th{background:var(--soft)}.lesson-content blockquote{border-left:3px solid var(--green);padding:4px 18px;background:var(--soft);margin-left:0;margin-right:0}.lesson-content pre{background:#ecf0e7;padding:18px;overflow-x:auto;border-radius:8px}.completion-box{border-top:1px solid var(--line);margin-top:40px;padding-top:24px;display:flex;align-items:center;justify-content:space-between;gap:24px}.completion-box h2{font-size:19px}.completion-box p{font-size:13px}.form-columns{display:flex;gap:24px}.field{margin-bottom:22px;flex:1}.order-field{max-width:110px}.editor-shell{border:1px solid #cfd8cc;border-radius:8px;overflow:hidden}.toolbar{display:flex;flex-wrap:wrap;gap:4px;padding:9px;background:#f1f4eb;border-bottom:1px solid var(--line)}.toolbar button{background:transparent;border:1px solid transparent;border-radius:5px;padding:5px 9px;color:var(--ink);font-size:13px}.toolbar button:hover,.toolbar button[aria-pressed=true]{background:#dce7d4}.tiptap{min-height:360px;padding:22px;outline:0}.save-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-top:24px}.checkbox{display:flex;align-items:center;gap:10px;margin:0}.empty{grid-column:1/-1;text-align:center;padding:64px 30px;border:1px dashed #cad6c3;border-radius:12px}.invite-link{font-family:monospace}footer{text-align:center;padding:24px;color:var(--muted);font-size:12px;border-top:1px solid var(--line)}
@media(min-width:761px){.lesson-menu summary{pointer-events:none}.lesson-menu summary span{display:none}}
@media(max-width:1050px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:220px minmax(0,1fr);gap:20px}.lesson-main{padding:24px}.completion-box{align-items:start;flex-direction:column}}
@media(max-width:760px){.topbar{padding:16px 20px;align-items:start;flex-direction:column;gap:14px}.topbar nav{gap:16px;width:100%;flex-wrap:wrap;font-size:12px}.username{padding-left:0;border:0}.container{padding:28px 18px}.page-heading{flex-direction:column;align-items:start;gap:16px;margin-bottom:30px}h1{font-size:30px}.course-grid{grid-template-columns:1fr}.course-art{height:130px}.auth-card{padding:24px;margin:15px auto}.lesson-layout{grid-template-columns:1fr;gap:20px}.lesson-main{padding:20px}.lesson-main h1{font-size:27px}.lesson-menu{position:static}.video-caption{flex-direction:column;gap:6px}.panel{padding:20px}.list-row{flex-wrap:wrap;gap:12px}.list-row form{width:100%;justify-content:flex-end}.form-columns{gap:12px}.save-bar{flex-direction:column;align-items:stretch}.save-bar .button{width:100%}.lesson-heading .eyebrow{max-width:65%}.art-caption{margin-top:10px}}