html{color-scheme:light}html[data-theme=dark]{color-scheme:dark}.hl-header{--hl-bg:#f6f5f0;--hl-ink:#243b3d;--hl-muted:#586b68;--hl-line:#d8dfd7;box-sizing:border-box;display:flex;align-items:center;flex-wrap:wrap;gap:22px;max-width:1200px;margin:0 auto;padding:22px 24px;border-bottom:1px solid var(--hl-line);color:var(--hl-ink);font:15px/1.5 -apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif}.hl-header *{box-sizing:border-box}.hl-header a{color:inherit;text-decoration:none}.hl-header a:hover{text-decoration:underline}.hl-header .hl-brand{display:flex;align-items:center;gap:12px;font-size:21px;font-weight:750;letter-spacing:0;flex-shrink:0}.hl-brand small{display:block;font-size:10px;letter-spacing:.2em;color:var(--hl-muted)}.hl-mark{font:700 30px/1 Georgia,serif;border:1px solid currentColor;border-radius:7px;padding:6px}.hl-header .hl-nav{display:flex;flex:1;justify-content:center;gap:22px;margin:0;padding:0}.hl-nav a{padding:10px 0;white-space:nowrap}.hl-nav a[aria-current]{border-bottom:2px solid currentColor;font-weight:650}.hl-account{display:flex;align-items:center;gap:13px;flex-wrap:wrap;font-size:13px}.hl-account form{margin:0;display:inline}.hl-account button{color:inherit;background:transparent;border:1px solid var(--hl-line);border-radius:5px;padding:7px 10px;font:inherit;cursor:pointer}.hl-account form button{border:0;padding:0}.hl-header :focus-visible{outline:2px solid #386c7d;outline-offset:4px}html[data-theme=dark] .hl-header{--hl-bg:#172426;--hl-ink:#dfebe6;--hl-muted:#a4b8b1;--hl-line:#3b5550}.hl-header~main>header .header-actions{display:none}body.blog-preview #theme{display:none}.hl-header~main>header{padding-top:25px}body:not(.blog-preview){background:var(--bg,#f6f5f0)}.series-listing>.row-number{white-space:nowrap;flex-shrink:0}.article-filters{display:flex;flex-wrap:wrap;gap:12px;margin:25px 0}.article-filters a{padding:7px 16px;border:1px solid var(--line);border-radius:4px;text-decoration:none}.article-filters a[aria-current]{background:var(--ink);color:var(--bg)}.archive-meta{font-size:13px;color:var(--muted)}@media(max-width:850px){.hl-header{gap:15px;padding:18px 20px}.hl-header .hl-nav{order:3;width:100%;flex-basis:100%;justify-content:space-between;gap:12px}.hl-account{margin-left:auto;justify-content:flex-end}.hl-header .hl-brand{font-size:19px}}@media(max-width:450px){.hl-account{font-size:12px;gap:8px;max-width:55%}.hl-header .hl-nav{font-size:14px}.hl-mark{font-size:26px}.hl-header{padding:14px 12px}}.article-filters+.home-stream{margin-top:24px}.hl-header{background:transparent}html[data-theme=light] .hl-header{color:#243b3d}html[data-theme=dark] .hl-header{color:#dfebe6}

/* Keep site navigation independent from account controls at every width. */
.hl-header{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:28px;padding:18px 24px;position:relative;z-index:20;overflow:visible}.hl-header .hl-nav{min-width:0;justify-content:center;gap:24px;flex:none;width:auto;flex-basis:auto;order:initial}.hl-header .hl-account{margin:0;max-width:none;flex-wrap:nowrap;gap:12px;white-space:nowrap}.hl-header .hl-user-menu{position:relative;margin:0;padding:0;border:0;background:transparent;overflow:visible}.hl-user-menu>summary{display:flex;align-items:center;gap:8px;list-style:none;cursor:pointer;padding:5px 0;font:14px/1.5 system-ui;color:inherit}.hl-user-menu>summary::-webkit-details-marker{display:none}.hl-avatar{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;border:1px solid var(--hl-line);background:var(--hl-bg);font-weight:650}.hl-header .hl-user-panel{position:absolute;right:0;top:calc(100% + 12px);width:208px;padding:10px;background:var(--hl-bg);color:var(--hl-ink);border:1px solid var(--hl-line);border-radius:8px;box-shadow:0 8px 24px #0002;z-index:100;text-align:left;white-space:normal}.hl-header .hl-user-panel p{margin:0;padding:8px 10px 12px;border-bottom:1px solid var(--hl-line);font-size:12px;color:var(--hl-muted);overflow-wrap:anywhere}.hl-header .hl-user-panel>a,.hl-header .hl-user-panel form button{display:block;width:100%;padding:10px;margin:0;border:0;border-radius:4px;text-align:left;font:14px/1.5 system-ui;color:inherit;text-decoration:none;background:transparent}.hl-header .hl-user-panel>a:hover,.hl-header .hl-user-panel form button:hover{background:color-mix(in srgb,var(--hl-ink) 8%,transparent)}.hl-header .hl-user-panel form{display:block;margin-top:4px;border-top:1px solid var(--hl-line);padding-top:4px}@media(max-width:1050px){.hl-header{grid-template-columns:minmax(0,1fr) auto;gap:14px 20px}.hl-header .hl-nav{grid-column:1/-1;grid-row:2;justify-content:flex-start;gap:30px}.hl-header .hl-account{grid-column:2;grid-row:1}}@media(max-width:540px){.hl-header{padding:14px 16px;gap:12px}.hl-header .hl-brand{font-size:18px;gap:8px}.hl-header .hl-mark{font-size:25px}.hl-header .hl-nav{justify-content:space-between;gap:10px;font-size:14px}.hl-header .hl-account{gap:9px;font-size:12px}.hl-user-label{display:none}.hl-header #hl-theme{padding:6px 8px;font-size:12px}.hl-brand small{font-size:9px}.hl-header .hl-user-panel{right:0}}

/* Place the account panel below all header rows. */
.hl-header .hl-user-menu{position:static}.hl-header .hl-user-panel{top:calc(100% + 8px);right:24px;width:224px;max-width:calc(100vw - 32px);max-height:calc(100dvh - 170px);overflow:auto;overscroll-behavior:contain}.hl-user-menu>summary{min-height:44px;min-width:44px;justify-content:center;border-radius:5px}.hl-header .hl-nav a{min-height:44px;display:inline-flex;align-items:center}.hl-header .hl-account>a,.hl-header #hl-theme{min-height:44px;display:inline-flex;align-items:center;justify-content:center}.hl-header .hl-user-panel>a,.hl-header .hl-user-panel form button{min-height:44px}.hl-header .hl-user-panel form button:focus-visible,.hl-user-menu>summary:focus-visible{outline:2px solid #386c7d;outline-offset:3px}.hl-header a,.hl-header button,.hl-header summary{touch-action:manipulation}@media(max-width:540px){.hl-header .hl-user-panel{right:16px}.hl-header .hl-account,.hl-header .hl-brand{min-width:0}.hl-header #hl-theme{width:44px;padding:6px;font-size:0}.hl-header #hl-theme:before{content:'☾';font-size:18px}.hl-header #hl-theme[aria-pressed=true]:before{content:'☀'}.hl-header .hl-nav{gap:8px}.hl-header .hl-user-panel{max-height:calc(100dvh - 160px)}}
.hl-header{background:var(--hl-bg)}
body:has(.hl-header) main>header #theme{display:none}

/* The document canvas and shared header use the same site background. Device surfaces retain their own palette. */
html{--hl-canvas:#f6f5f0}html[data-theme=dark]{--hl-canvas:#172426}body:has(>.hl-header){background:var(--hl-canvas)!important}.hl-header{background:var(--hl-canvas)}

.archive-pagination{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin:30px 0 50px;font-size:14px}.archive-pagination>span{color:var(--muted);margin-right:auto}.archive-pagination a{display:inline-flex;align-items:center;justify-content:center;min-height:44px;min-width:44px;padding:8px 12px;border:1px solid var(--line);border-radius:4px;text-decoration:none}.archive-pagination a[aria-current]{background:var(--ink);color:var(--bg)}@media(max-width:540px){.archive-pagination>span{width:100%}}

.wechat-claim{margin-top:24px}.wechat-claim p{margin:12px 0;font-size:15px;line-height:1.8}.wechat-qr{display:block;width:180px;max-width:100%;height:auto;margin:16px 0}

.wechat-claim-body{display:flex;align-items:flex-start;gap:28px}.wechat-claim-code{flex:0 0 180px;margin:0}.wechat-claim-code figcaption{font-size:13px;color:var(--muted)}.wechat-claim-steps{min-width:0;flex:1}.wechat-claim-steps ol{margin:8px 0 18px;padding-left:24px;line-height:1.9}.wechat-claim-steps li{margin:8px 0;overflow-wrap:anywhere}.wechat-claim-steps code{font:inherit;font-weight:700;white-space:nowrap}.wechat-claim-rules{margin-top:24px;padding-top:16px;border-top:1px solid var(--line,#d6ded8)}.wechat-claim-rules summary{cursor:pointer;font-size:14px}.wechat-claim .primary{display:inline-block}.wechat-claim+#access-management{margin-top:20px}
@media(max-width:600px){.wechat-claim-body{flex-direction:column;gap:12px}.wechat-claim-code{flex-basis:auto}.wechat-claim-steps li{margin:12px 0}.wechat-claim p{font-size:14px}}

/* Standalone diagram details use the same column as the shared site header. */
body.iso:has(>.hl-header)>main{box-sizing:border-box;width:100%;max-width:1200px;margin-inline:auto;padding-inline:24px}
body.iso:has(>.hl-header)>#course-page-navigation{box-sizing:border-box;width:100%;max-width:1200px;margin-inline:auto;padding-inline:24px}
@media(max-width:750px){body.iso:has(>.hl-header)>main,body.iso:has(>.hl-header)>#course-page-navigation{padding-inline:16px}}