:root{--ink:#16191d;--mute:#5d6670;--line:#dfe3e7;--bg:#f6f5f1;--card:#fff;--acc:#1f8a3c;--acc2:#e7f4ea;--acc3:#0f6d74;--bad:#c4412f}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Arial,sans-serif}
a{color:var(--acc3)}.wrap{max-width:1120px;margin:0 auto;padding:0 22px}.wide{max-width:1500px;margin:0 auto;padding:0 18px}
main{min-height:70vh;padding-top:28px;padding-bottom:50px}
.top{background:#111417;color:#fff}.topin{display:flex;justify-content:space-between;align-items:center;height:66px;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none}.brand img{width:40px;height:40px;border-radius:8px}.brand b{display:block;font-size:18px;letter-spacing:.01em}.brand small{display:block;font-size:11.5px;color:#a9b2ba}
nav{display:flex;align-items:center;gap:16px;flex-wrap:wrap}nav a{color:#e9ecef;text-decoration:none;font-size:14.5px}nav a:hover{color:#7fd492}
.inl{display:inline;margin:0}.linkbtn{background:none;border:0;color:#e9ecef;font:inherit;font-size:14.5px;cursor:pointer;padding:0}
.btn{display:inline-block;background:var(--acc);color:#fff;border:1px solid var(--acc);border-radius:8px;padding:9px 16px;font:inherit;font-size:15px;font-weight:600;text-decoration:none;cursor:pointer}
.btn:hover{filter:brightness(1.08)}.btn.ghost{background:#fff;color:var(--ink);border-color:var(--line)}.btn.sm{padding:5px 11px;font-size:14px;color:#fff}
.hero{padding:26px 0 10px}.hero h1{font-size:40px;line-height:1.12;margin:6px 0 12px;max-width:820px;letter-spacing:-.015em}
.kick{font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--acc);font-weight:700;margin:0}
.lede{font-size:18px;color:#39414a;max-width:760px}.row{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}
h2.track{margin:38px 0 12px;font-size:22px;border-top:2px solid var(--ink);padding-top:14px}.muted{color:var(--mute)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden;color:inherit;text-decoration:none;display:flex;flex-direction:column}
.card:hover{border-color:var(--acc)}.cover{width:100%;aspect-ratio:16/9;object-fit:cover;display:block}
.cover.ph{background:linear-gradient(135deg,#111417,#1f3a27);display:flex;align-items:flex-end;padding:14px}.cover.ph span{color:#7fd492;font-weight:700;letter-spacing:.06em;text-transform:uppercase;font-size:13px}
.cbody{padding:14px 16px 16px}.cbody h3{margin:4px 0 6px;font-size:18px;line-height:1.3}.cbody p{margin:0 0 10px;color:#4a525b;font-size:14.5px}
.meta{display:flex;gap:12px;flex-wrap:wrap;font-size:13px;color:var(--mute)}
.cols2{display:grid;grid-template-columns:1fr 340px;gap:28px}.side .box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px;display:flex;flex-direction:column;gap:10px}
.side .cover{border-radius:12px;margin-bottom:12px}.incl{margin:6px 0 0;padding-left:18px;font-size:14px;color:#4a525b}
.note{background:var(--acc2);border-left:4px solid var(--acc);padding:10px 14px;font-size:14.5px}
.lessons{list-style:none;padding:0;margin:0;counter-reset:l}.lessons li{background:#fff;border:1px solid var(--line);border-radius:10px;margin:8px 0}
.lessons li>a,.lessons li>span{display:grid;grid-template-columns:110px 1fr auto;gap:10px;padding:11px 14px;color:inherit;text-decoration:none;align-items:center}
.lessons small{color:var(--mute);font-size:12.5px;text-transform:uppercase;letter-spacing:.05em}.lessons em{font-style:normal;font-size:13px;color:var(--mute)}
.lessons li.done{border-color:#9ccfa9}.lessons li>a:hover{background:#fafcfa}
.bar{height:8px;background:#e8ebee;border-radius:5px;overflow:hidden;margin:6px 0 2px}.bar span{display:block;height:100%;background:var(--acc)}
.learn{display:grid;grid-template-columns:270px 1fr;gap:20px}.lnav{background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px;align-self:start;position:sticky;top:12px;max-height:92vh;overflow:auto}
.lnav a{display:block;padding:7px 9px;border-radius:7px;color:var(--ink);text-decoration:none;font-size:14px}.lnav a small{display:block;color:var(--mute);font-size:11px;text-transform:uppercase;letter-spacing:.05em}
.lnav a.cur{background:var(--acc2);font-weight:600}.lnav .back{font-weight:600;color:var(--acc3);border-bottom:1px solid var(--line);border-radius:0;margin-bottom:6px}
.lmain h1{margin:4px 0 12px;font-size:28px}.vid{width:100%;max-height:72vh;background:#000;border-radius:12px}
.vidwrap{position:relative;padding-top:56.25%;border-radius:12px;overflow:hidden;background:#000}.vidwrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.lbar{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:12px 0}.lbar .sp{flex:1}
.notes{width:100%;height:85vh;border:1px solid var(--line);border-radius:12px;background:#fff;margin-top:8px}
.authbox{max-width:420px;margin:30px auto;background:#fff;border:1px solid var(--line);border-radius:14px;padding:24px}
.authbox form{display:flex;flex-direction:column;gap:12px}.authbox label{display:flex;flex-direction:column;font-size:14px;color:var(--mute);gap:4px}
input,select,textarea{font:inherit;padding:8px 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink)}
.err{background:#f8e1dd;color:var(--bad);padding:8px 12px;border-radius:8px}
.foot{border-top:1px solid var(--line);font-size:13px;color:var(--mute);padding:18px 0}.foot .wrap{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
@media (max-width:860px){.cols2,.learn{grid-template-columns:1fr}.lnav{position:static;max-height:none}.hero h1{font-size:30px}.lessons li>a,.lessons li>span{grid-template-columns:1fr}}
main.wrap,main.wide{padding-top:28px;padding-bottom:50px}