.atlas{--bg:#080a0c;--surface:#111519;--line:#293138;--muted:#a9b5bf;--accent:#58e1e8;background:var(--bg);color:#f3f7f9;min-height:100dvh;font:16px/1.7 Arial,Helvetica,sans-serif}.atlas *{box-sizing:border-box}.atlas a{color:inherit;text-underline-offset:5px}:is(.atlas a:focus-visible,.atlas button:focus-visible,.atlas input:focus-visible){outline:2px solid var(--accent);outline-offset:5px}.atlas-header{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;gap:32px;padding:22px 4vw;display:flex}.wordmark{letter-spacing:-.7px;white-space:nowrap;font-size:21px;font-weight:800;text-decoration:none}.wordmark span{color:var(--muted);letter-spacing:1px;font-size:14px;font-weight:400}.atlas nav{flex-wrap:wrap;gap:22px;display:flex}.atlas nav a{align-items:center;min-height:44px;font-size:14px;text-decoration:none;display:inline-flex}.atlas nav a[aria-current]{color:var(--accent);box-shadow:0 2px var(--accent)}.parent-link{letter-spacing:1px;font-size:12px}.atlas main{max-width:1240px;margin:auto;padding:0 32px 80px}.atlas .eyebrow{letter-spacing:2px;text-transform:uppercase;color:var(--accent);font-size:12px;font-weight:700}.atlas h1{letter-spacing:-.055em;margin:22px 0 28px;font-size:clamp(40px,6vw,78px);font-weight:600;line-height:1.04}.atlas h1 em{color:var(--accent);font-style:normal}.atlas h2{letter-spacing:-1px;font-size:clamp(26px,3vw,38px);font-weight:500;line-height:1.2}.atlas h3{font-size:21px;line-height:1.35}.atlas p{color:var(--muted)}.hero{grid-template-columns:1.4fr 1fr;align-items:center;gap:70px;padding:76px 0 58px;display:grid}.hero .lead{max-width:630px;font-size:19px}.actions{flex-wrap:wrap;gap:12px;margin-top:28px;display:flex}.atlas .button{border:1px solid var(--line);border-radius:5px;justify-content:center;align-items:center;min-height:48px;padding:11px 20px;font-size:15px;font-weight:600;text-decoration:none;display:inline-flex}.atlas .button.primary{background:var(--accent);color:#071215;border-color:var(--accent)}.index-panel{border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.index-panel a{border-bottom:1px solid var(--line);grid-template-columns:35px 1fr 24px;align-items:center;gap:12px;padding:22px 0;text-decoration:none;display:grid}.index-panel a:last-child{border:0}.index-panel small,.number{color:var(--accent);font:13px monospace}.index-panel strong{font-size:20px;font-weight:500}.index-panel p{margin:4px 0 0;font-size:14px}.section-head{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:20px;margin-top:32px;padding-top:28px;display:flex}.card-grid{grid-template-columns:repeat(3,1fr);gap:16px;display:grid}.atlas .card{background:var(--surface);border:1px solid var(--line);border-radius:8px;flex-direction:column;min-width:0;padding:26px;display:flex}.atlas .card:hover{border-color:#4f6e78}.atlas .card p{font-size:16px}.atlas .card a:last-child{margin-top:auto}.tag{color:var(--accent);letter-spacing:1px;text-transform:uppercase;font-size:12px}.atlas .card h2{letter-spacing:-.6px;font-size:25px}.atlas-footer{border-top:1px solid var(--line);padding:40px 4vw max(36px,env(safe-area-inset-bottom));grid-template-columns:1fr 1fr;gap:50px;display:grid}.atlas-footer p{max-width:580px;font-size:14px}.page-intro{max-width:850px;padding:64px 0 34px}.page-intro h1{font-size:clamp(38px,5vw,64px)}.page-intro p{font-size:19px}.notice{border-left:2px solid var(--accent);background:var(--surface);margin:32px 0;padding:22px}.article-layout{grid-template-columns:220px minmax(0,740px);align-items:start;gap:60px;display:grid}.article-layout aside{position:sticky;top:24px}.article-layout aside a{color:var(--muted);padding:8px 0;font-size:14px;display:block}.lesson section{margin-bottom:42px;scroll-margin-top:20px}.lesson p,.lesson li{color:#bcc7cf;font-size:18px;line-height:1.85}.lesson h2{font-size:30px}.lesson .exercise{background:#132428;border:1px solid #34545a;border-radius:6px;padding:26px}.atlas details{border-bottom:1px solid var(--line);padding:18px 0}.atlas summary{cursor:pointer;font-size:18px}.atlas pre{border:1px solid var(--line);white-space:pre-wrap;overflow-wrap:anywhere;background:#040607;border-radius:6px;padding:24px;font-size:14px;overflow:auto}.lesson-search{color:#fff;width:100%;max-width:600px;font:inherit;background:#111519;border:1px solid #43515c;border-radius:5px;margin:10px 0 26px;padding:16px}.atlas .skip{color:#000;z-index:1000;background:#fff;padding:12px;position:absolute;top:-80px;left:10px}.atlas .skip:focus{top:10px}.source-list{font-size:14px}.lesson-nav{border-top:1px solid var(--line);justify-content:space-between;gap:20px;margin-top:40px;padding-top:24px;display:flex}@media (max-width:900px){.atlas-header{flex-wrap:wrap;gap:10px}.atlas-header nav{order:3;gap:20px;width:100%}.hero{grid-template-columns:1fr;gap:30px}.card-grid{grid-template-columns:repeat(2,1fr)}.article-layout{grid-template-columns:1fr;gap:24px}.article-layout aside{border-bottom:1px solid var(--line);padding-bottom:20px;position:static}.atlas-footer{gap:24px}.hero{padding-top:45px}}@media (max-width:560px){.atlas main{padding:0 20px 50px}.atlas-header{padding:16px 20px}.atlas-header nav{justify-content:space-between;gap:4px}.atlas-header nav a{padding:5px;font-size:13px}.parent-link{font-size:11px}.card-grid,.atlas-footer{grid-template-columns:1fr}.hero{padding:38px 0 30px}.atlas .card{padding:22px}.page-intro{padding-top:38px}.section-head{align-items:flex-start}.atlas-footer{padding:30px 20px}.lesson p,.lesson li{font-size:17px}}