.layout{max-width:1240px;margin:auto;display:grid;grid-template-columns:230px minmax(0,1fr);gap:50px;padding:48px 28px}
main{min-width:0}aside{position:sticky;top:108px;align-self:start;padding-right:24px;border-right:1px solid var(--line);max-height:calc(100vh - 130px);overflow:auto}
aside p{font-size:14px;color:var(--muted)}aside p:first-child{color:var(--ink);font-family:var(--heading);font-size:16px}aside nav{display:grid;gap:4px}
aside a{font-size:14px;text-decoration:none;color:var(--muted);padding:8px 10px;border-left:2px solid transparent;border-radius:0 4px 4px 0;line-height:1.5}
aside a:hover,aside a.current{background:#e1eee6;color:#006b55;border-left-color:var(--blue)}.chapter-toggle{display:none}
h1{font-size:clamp(34px,4.6vw,56px);margin:15px 0 20px;font-weight:800}h2{font-size:30px;margin:0 0 24px}h3{font-size:21px;margin:28px 0 12px}
.lead{font-size:19px;color:var(--muted);line-height:1.7}.meta,.cloud-links{display:flex;flex-wrap:wrap;gap:8px}
.meta span{font-size:13px;padding:5px 10px;border:1px solid var(--line);border-radius:4px;background:#fff}
.cloud-links{margin:20px 0}.cloud-links a{font-size:14px;padding:4px 0;margin-right:14px}
section{margin:42px 0;padding:32px;background:white;border:1px solid var(--line);border-radius:8px;min-width:0;scroll-margin-top:105px}
.analogy{background:#e8f4ee;border-left:3px solid var(--blue);padding:18px 22px;border-radius:0 5px 5px 0}
.notice{background:#faf1df;border-left:3px solid #be8117;padding:18px 22px;margin:24px 0;color:#4d4129}.notice a{color:#00624e}
.flow{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0}.flow div{flex:1;min-width:130px;padding:18px;background:var(--ink);color:white;border-radius:5px}.flow small{display:block;color:#bbd2c7}li{margin:10px 0}
code{font:14px ui-monospace,monospace;background:#eaf1ed;padding:2px 5px;border-radius:3px;overflow-wrap:anywhere}
.snippet{margin:22px 0;border:1px solid #405454;border-radius:6px;overflow:hidden}
.code-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;padding:12px 16px;background:#23343c;color:#dcebe4;font-size:14px}
.code-head a{margin-left:auto;color:#80ebcf}.code-head button{font:600 14px var(--font);border:1px solid #789b90;border-radius:4px;background:#314c4e;color:white;padding:6px 12px;cursor:pointer;flex-shrink:0}.code-head button:hover{background:#426e68}
pre{margin:0;padding:22px;background:#101d25;color:#e0ede7;overflow:auto;max-height:520px;font:14px/1.75 ui-monospace,monospace}
pre code{background:none;padding:0;color:inherit;white-space:pre;overflow-wrap:normal}
.os{display:flex;flex-wrap:wrap;gap:9px;margin:25px 0 12px}.os button{font:600 16px var(--font);padding:10px 18px;border:1px solid #b8c9bf;background:white;border-radius:5px;cursor:pointer;color:var(--ink)}
.os button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}[hidden]{display:none!important}
.checkpoint{padding:17px 20px;border:1px solid #bed9c9;border-radius:5px;background:#eef8f0;margin-top:24px}
.sources{font-size:14px;color:var(--muted)}.sources a{display:inline-block;margin:4px 14px 4px 0}
table{width:100%;border-collapse:collapse;font-size:15px}th,td{text-align:left;vertical-align:top;padding:14px 12px;border-bottom:1px solid var(--line)}th{background:#edf3ef;color:#2c473c}.table-wrap{overflow:auto}
footer{max-width:1240px;margin:auto;padding:28px;color:var(--muted);font-size:14px;border-top:1px solid var(--line)}
@media(max-width:850px){.layout{grid-template-columns:1fr;gap:24px;padding:28px 22px}aside{position:static;border:1px solid var(--line);background:white;border-radius:6px;padding:16px 20px;max-height:none}aside p:first-child{margin:0 0 10px}aside p:last-child{margin-bottom:0}.chapter-toggle{display:block;font:600 15px var(--font);color:var(--blue);border:1px solid var(--line);background:white;padding:8px 12px;border-radius:4px;cursor:pointer}aside nav{display:none;padding-top:12px}aside nav.chapters-open{display:grid;grid-template-columns:1fr 1fr}h1{font-size:42px}section{padding:26px}}
@media(max-width:850px){.chapter-toggle{display:none}.navigation-ready .chapter-toggle{display:block}aside nav{display:grid;grid-template-columns:1fr 1fr}.navigation-ready aside nav:not(.chapters-open){display:none}}
@media(max-width:540px){.layout{padding:22px 18px}.lead{font-size:17px}h1{font-size:35px}h2{font-size:26px}section{padding:22px 18px}.code-head{padding:12px}pre{padding:18px;font-size:14px}aside nav,aside nav.chapters-open{grid-template-columns:1fr}.flow{flex-direction:column}.notice,.analogy{padding:16px 18px}}