:root{--ink:#163b2d;--muted:#597165;--green:#25664b;--paper:#fff;--bg:#f3f7f3;--line:#dce7de}*{box-sizing:border-box}.ccna-main a{color:var(--green)}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #cc8a32;outline-offset:4px}.wrap{max-width:1240px;margin:auto;padding:0 28px}.top{border-bottom:1px solid var(--line);background:var(--paper)}.top .wrap{display:flex;justify-content:space-between;align-items:center;min-height:78px;gap:20px}.brand{font-size:22px;font-weight:800;text-decoration:none;letter-spacing:-1px}.top nav{display:flex;gap:24px}.top nav a{text-decoration:none;font-size:14px}.course-hero{padding:66px 0 44px;max-width:840px}.eyebrow{font:700 12px/1.4 system-ui;letter-spacing:2px;text-transform:uppercase;color:var(--green)}.ccna-main h1{font-size:clamp(36px,5vw,64px);line-height:1.08;letter-spacing:-2px;margin:18px 0 24px}.ccna-main h2{font-size:26px;letter-spacing:-.7px}.ccna-main h3{line-height:1.4}.lead{font-size:19px;color:var(--muted);max-width:680px}.stats{display:flex;gap:30px;padding-top:20px;color:var(--muted);font-size:13px}.stats strong{display:block;font-size:25px;color:var(--ink)}.toolbar{display:grid;grid-template-columns:1fr 260px;gap:14px;background:var(--paper);border:1px solid var(--line);padding:20px;border-radius:14px}.toolbar label{font-size:12px;font-weight:700}.toolbar input,.toolbar select{display:block;width:100%;font:inherit;color:var(--ink);padding:12px;border:1px solid var(--line);border-radius:7px;background:var(--bg);margin-top:6px}.count{color:var(--muted);font-size:13px;margin:18px 0}.day-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.day-card{background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:24px;text-decoration:none;display:flex;flex-direction:column;min-height:205px;transition:transform .15s,border-color .15s}.day-card:hover{transform:translateY(-3px);border-color:var(--green)}.day-card .number{font:700 12px/1.4 system-ui;letter-spacing:1.3px;text-transform:uppercase}.ccna-main .day-card h3{font-size:20px;margin:16px 0 22px;color:var(--ink)}.day-card .topic{margin-top:auto;color:var(--muted);font-size:12px;display:flex;justify-content:space-between}.group-title{display:flex;align-items:baseline;justify-content:space-between;margin-top:40px}.group-title span{font-size:13px;color:var(--muted)}.footer{padding:45px 0;margin-top:50px;border-top:1px solid var(--line);color:var(--muted);font-size:13px}.crumb{padding-top:28px;font-size:13px}.lesson-head{padding:28px 0 34px;max-width:900px}.ccna-main .lesson-head h1{font-size:clamp(32px,4vw,48px)}.pills{display:flex;gap:12px;flex-wrap:wrap}.ccna-main .button{display:inline-block;border:1px solid var(--line);border-radius:7px;background:var(--paper);color:var(--green);padding:10px 16px;text-decoration:none;font:600 14px/1.5 system-ui;cursor:pointer}.button.primary{background:var(--green);color:white;border-color:var(--green)}.reading-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:34px;align-items:start}.aside{position:sticky;top:20px}.aside a{display:block;text-decoration:none;padding:9px 0;font-size:14px}.aside .muted{font-size:12px;color:var(--muted)}.note-part{scroll-margin-top:24px}.note-image{background:white;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin:16px 0}.note-image a{display:block}.note-image img{width:100%;height:auto;display:block}.note-image figcaption{font-size:12px;color:var(--muted);padding:10px 18px;border-top:1px solid var(--line)}figure{margin:0}.text-view{background:white;border:1px solid var(--line);border-radius:8px;padding:24px;margin:16px 0}.text-view summary{font-weight:700;cursor:pointer}.text-view pre{font:16px/1.75 system-ui;white-space:pre-wrap;overflow-wrap:anywhere;color:#243d31}.pager{display:flex;justify-content:space-between;gap:20px;border-top:1px solid var(--line);padding-top:28px;margin-top:36px}.pager a{text-decoration:none;max-width:48%;font-weight:600}.pager small{display:block;color:var(--muted);font-weight:400}.empty{padding:40px;background:white;border-radius:12px}[hidden]{display:none!important}@media(max-width:900px){.day-grid{grid-template-columns:repeat(2,1fr)}.reading-layout{grid-template-columns:1fr}.aside{position:static;display:flex;gap:16px;flex-wrap:wrap}.aside .muted{width:100%}}@media(max-width:600px){.wrap{padding:0 18px}.top .wrap{min-height:68px}.top nav{gap:14px}.top nav a{font-size:12px}.course-hero{padding-top:40px}.toolbar,.day-grid{grid-template-columns:1fr}.stats{gap:22px}.day-card{min-height:170px}.group-title{display:block}.text-view{padding:16px}.ccna-main .lesson-head h1{letter-spacing:-1px}}


body.dark-mode{--ink:#e4e6eb;--muted:#a7bcb2;--green:#91d1ad;--paper:#18241f;--bg:#0f1914;--line:#354a3d}.ccna-main{color:var(--ink)}.ccna-main p{margin:0 0 16px}.ccna-main h2{margin:24px 0 18px}.ccna-main h3{margin:0 0 14px}.ccna-main .course-hero{background:none;border:none;box-shadow:none;text-align:left;margin:0}.ccna-main header.lesson-head{position:static;top:auto;z-index:auto;backdrop-filter:none;background:none;border:0;color:var(--ink);padding:0 0 28px}.ccna-main .crumb{padding-bottom:24px}.ccna-main .button.primary{color:white;background:#25664b}.ccna-main .lesson-content{min-width:0}.ccna-main .lesson-content>header h1{margin-top:14px}.ccna-main .reading-layout{padding-top:0}.course-sidebar{position:sticky;top:calc(var(--site-header-height,90px) + 18px);align-self:start;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:16px;min-width:0}.course-sidebar summary{font-weight:750;font-size:17px;cursor:pointer;margin-bottom:12px}.sidebar-shortcuts{display:grid;gap:6px;padding-bottom:14px;border-bottom:1px solid var(--line);margin-bottom:14px}.sidebar-shortcuts a{font-weight:650;font-size:14px;text-decoration:none;padding:7px 9px;border-radius:5px}.sidebar-shortcuts a[aria-current]{background:var(--bg);border-left:3px solid var(--green)}.day-search-label,.command-search-label{display:block;font-size:13px;font-weight:650;margin-bottom:6px}#day-search,#command-search{display:block;width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--ink);font:inherit}#day-search{font-size:13px;margin-bottom:12px}.day-scroll{height:clamp(200px,calc(100dvh - var(--site-header-height,90px) - 275px),620px);overflow-y:scroll;overscroll-behavior:contain;scrollbar-gutter:stable;scrollbar-width:thin;scrollbar-color:#789a86 var(--bg);padding-right:5px}.day-scroll::-webkit-scrollbar{width:9px}.day-scroll::-webkit-scrollbar-track{background:var(--bg)}.day-scroll::-webkit-scrollbar-thumb{background:#789a86;border:2px solid var(--bg);border-radius:8px}.ccna-main .day-scroll a{display:grid;grid-template-columns:46px 1fr;gap:8px;font-size:12px;font-weight:500;line-height:1.4;border-radius:6px;padding:10px 8px;text-decoration:none;color:var(--muted);transform:none}.day-scroll a span:first-child{font-weight:700}.ccna-main .day-scroll a:hover{background:var(--bg);color:var(--ink)}.ccna-main .day-scroll a[aria-current="page"]{background:#25664b;color:#fff}.command-search-label{margin-top:4px}.command-section{scroll-margin-top:calc(var(--site-header-height,90px) + 20px);margin-bottom:32px}.command-list{display:grid;gap:12px}.command-entry{background:var(--paper);border:1px solid var(--line);border-radius:9px;padding:20px;overflow-wrap:anywhere}.ccna-main .command-entry h3{font-size:16px;margin:0 0 12px}.command-entry code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;color:var(--ink);white-space:pre-wrap}.command-entry p{font-size:14px;line-height:1.7;color:var(--muted)}.command-meta{display:flex;justify-content:space-between;gap:18px;font-size:12px;color:var(--muted);border-top:1px solid var(--line);padding-top:10px}.command-meta a{font-weight:700}.commands-cta{padding-top:12px}.ccna-main .text-view{background:var(--paper)}.ccna-main .text-view pre{color:var(--ink)}.ccna-main .note-part{scroll-margin-top:calc(var(--site-header-height,90px) + 20px)}.ccna-main .pager a{border-radius:0;padding:0}.site-footer{margin-top:60px}body.dark-mode .ccna-main .empty{background:var(--paper)}
@media(max-width:900px){.course-sidebar{position:static}.day-scroll{height:220px}.ccna-main .reading-layout{gap:28px}.course-sidebar details:not([open]) summary{margin:0}}@media(min-width:901px){.ccna-main .reading-layout{grid-template-columns:280px minmax(0,1fr)}}
.site-header .top-controls{position:static;flex-shrink:0;z-index:auto;margin-left:4px}.site-header .header-content{gap:16px}.site-header .top-controls .toggle-label{margin:0}.site-header nav{min-width:0}.site-header .header-text{flex-shrink:0}@media(max-width:1100px) and (min-width:769px){.site-header .tagline{max-width:210px}.site-header nav a{padding:8px 10px}.site-header .header-text{flex-shrink:1}}@media(max-width:768px){.site-header .top-controls{position:absolute;top:16px;right:20px}.site-header .header-text{flex-shrink:1}.site-header .header-content{padding-right:24px}}