:root{--bg:#101118;--bg2:#171a23;--bg3:#1e2233;--border:#2c3145;--text:#e8eaf2;--muted:#7a809a;--accent:#4f8ef7;--accent2:#38d9a9;--accent3:#f7c948;--accent4:#f76b6b;--accent5:#b97cf7;--card:#1b2031;--r:16px;--mono:'DM Mono',monospace;--sans:'DM Sans',sans-serif;--serif:'Fraunces',serif;--grad-hero:linear-gradient(135deg,#4f8ef7 0%,#b97cf7 50%,#38d9a9 100%);--grad-accent:linear-gradient(135deg,#4f8ef7,#7c5cf7);--smooth:all .3s cubic-bezier(.4,0,.2,1)}
*{box-sizing:border-box;margin:0;padding:0;scrollbar-width:thin;scrollbar-color:var(--border) var(--bg)}
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--muted)}
::selection{background:rgba(79,142,247,.3);color:#fff}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:17px;line-height:1.85;min-height:100vh}
nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(16,17,24,.82);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border);height:58px}
.nav-inner{max-width:1020px;margin:0 auto;display:flex;align-items:center;height:100%;padding:0 1.5rem;gap:0}
.nav-logo{font-family:var(--serif);font-size:1.1rem;color:var(--accent);font-weight:600;margin-right:1.5rem;white-space:nowrap;cursor:pointer;text-decoration:none;transition:var(--smooth)}
.nav-logo:hover{color:#7ab0ff;text-shadow:0 0 12px rgba(79,142,247,.3)}
a.nav-btn{text-decoration:none}
.nav-links{display:flex;gap:2px;overflow-x:auto;scrollbar-width:none;flex:1}
.nav-links::-webkit-scrollbar{display:none}
.nav-btn{background:none;border:none;color:var(--muted);font-family:var(--sans);font-size:.8rem;padding:.3rem .75rem;cursor:pointer;border-radius:6px;transition:var(--smooth);white-space:nowrap;font-weight:500}
.nav-btn:hover{color:var(--text);background:var(--bg3)}
.nav-btn.active{color:#fff;background:var(--grad-accent);box-shadow:0 0 12px rgba(79,142,247,.2)}
.page{display:none;padding-top:74px;min-height:100vh;animation:fadein .3s ease}
.page.active{display:block}
@keyframes fadein{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.container{max-width:1060px;margin:0 auto;padding:2rem 2rem 5rem}
.hero{text-align:center;padding:2.5rem 1rem 2rem;position:relative}
.hero::before{content:'';position:absolute;top:-40px;left:50%;transform:translateX(-50%);width:600px;height:300px;background:radial-gradient(ellipse at center,rgba(79,142,247,.08) 0%,rgba(185,124,247,.04) 40%,transparent 70%);pointer-events:none;z-index:-1}
.hero-title{font-family:var(--serif);font-size:2.8rem;font-weight:300;line-height:1.15;margin-bottom:.9rem;text-shadow:0 0 40px rgba(79,142,247,.12)}
.hero-title span{background:var(--grad-hero);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-style:italic}
.hero-sub{font-size:1rem;color:var(--muted);max-width:580px;margin:0 auto 1.8rem}
.hero-tags{display:flex;gap:.5rem;justify-content:center;flex-wrap:wrap;margin-bottom:2rem}
.tag{padding:.3rem .9rem;border-radius:20px;font-size:.77rem;font-weight:600;backdrop-filter:blur(4px);transition:var(--smooth)}
.tag:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.2)}
.tag-blue{background:rgba(79,142,247,.18);color:#8dbdff;border:1px solid rgba(79,142,247,.35);box-shadow:0 0 12px rgba(79,142,247,.1)}
.tag-green{background:rgba(56,217,169,.15);color:#6ef5d0;border:1px solid rgba(56,217,169,.3);box-shadow:0 0 12px rgba(56,217,169,.08)}
.tag-yellow{background:rgba(247,201,72,.13);color:#ffe070;border:1px solid rgba(247,201,72,.25);box-shadow:0 0 12px rgba(247,201,72,.08)}
.tag-purple{background:rgba(185,124,247,.13);color:#d4a8ff;border:1px solid rgba(185,124,247,.25);box-shadow:0 0 12px rgba(185,124,247,.08)}
.home-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.2rem;margin-top:1.5rem}
.home-card{background:rgba(27,32,49,.7);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid var(--border);border-radius:var(--r);padding:1.3rem;cursor:pointer;transition:var(--smooth);position:relative;overflow:hidden;text-decoration:none;color:inherit;display:block}
.home-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;border-radius:3px 3px 0 0;opacity:.75;transition:opacity .3s,height .3s}
.home-card.c1::before{background:var(--accent)}.home-card.c2::before{background:var(--accent2)}.home-card.c3::before{background:var(--accent3)}.home-card.c4::before{background:var(--accent5)}.home-card.c5::before{background:var(--accent4)}.home-card.c6::before{background:#f7973a}
.home-card:hover{transform:translateY(-5px) scale(1.01);border-color:rgba(255,255,255,.15)}
.home-card:hover::before{height:4px;opacity:1}
.home-card.c1:hover{box-shadow:0 8px 30px rgba(0,0,0,.3),0 0 20px rgba(79,142,247,.15)}
.home-card.c2:hover{box-shadow:0 8px 30px rgba(0,0,0,.3),0 0 20px rgba(56,217,169,.15)}
.home-card.c3:hover{box-shadow:0 8px 30px rgba(0,0,0,.3),0 0 20px rgba(247,201,72,.12)}
.home-card.c4:hover{box-shadow:0 8px 30px rgba(0,0,0,.3),0 0 20px rgba(185,124,247,.15)}
.home-card.c5:hover{box-shadow:0 8px 30px rgba(0,0,0,.3),0 0 20px rgba(247,107,107,.12)}
.home-card.c6:hover{box-shadow:0 8px 30px rgba(0,0,0,.3),0 0 20px rgba(247,151,58,.12)}
.home-card-num{font-family:var(--serif);font-size:1.8rem;font-weight:300;margin-bottom:.4rem;background:linear-gradient(135deg,var(--accent),var(--accent5));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;opacity:.3}
.home-card h3{font-size:.95rem;font-weight:600;margin-bottom:.3rem}
.home-card p{font-size:.8rem;color:var(--muted);line-height:1.5}
.section-header{margin-bottom:3rem;padding-bottom:2rem;border-bottom:none;position:relative}
.section-header::after{content:'';position:absolute;bottom:0;left:0;width:80px;height:3px;background:var(--grad-accent);border-radius:2px}
.section-num{font-family:var(--serif);font-size:.82rem;background:var(--grad-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-style:italic;margin-bottom:.3rem;font-weight:600;letter-spacing:.03em}
.section-title{font-family:var(--serif);font-size:2.1rem;font-weight:300;letter-spacing:-.01em}
.section-title em{background:linear-gradient(135deg,var(--accent2),#5cedc6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-style:italic}
.section-intro{color:var(--muted);font-size:.97rem;margin-top:.5rem;line-height:1.65;max-width:680px}
h2{font-size:1.25rem;font-weight:600;margin:3.5rem 0 1.2rem;color:var(--text);display:flex;align-items:center;gap:.75rem}
h2::after{content:'';flex:1;height:1px;background:linear-gradient(to right,var(--border),transparent)}
.sblock{border-left:3px solid;padding-left:1.2rem;margin:3.5rem 0 0;border-radius:0}
.sblock>h2{margin-top:0}
.sblock.dif-easy{border-left-color:#38d9a9}
.sblock.dif-medium{border-left-color:#f7c948}
.sblock.dif-hard{border-left-color:#f76b6b}
.sblock>h2::before{font-size:.65rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;padding:.15rem .55rem;border-radius:20px;margin-right:.15rem;flex-shrink:0}
.sblock.dif-easy>h2::before{content:'Débutant';background:rgba(56,217,169,.12);color:#7de8c9;border:1px solid rgba(56,217,169,.25)}
.sblock.dif-medium>h2::before{content:'Intermédiaire';background:rgba(247,201,72,.1);color:#f7d96a;border:1px solid rgba(247,201,72,.25)}
.sblock.dif-hard>h2::before{content:'Avancé';background:rgba(247,107,107,.1);color:#f7a0a0;border:1px solid rgba(247,107,107,.2)}
h3{font-size:1.05rem;font-weight:600;margin:2.8rem 0 .9rem;color:var(--accent2)}
h4{font-size:.82rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin:1.8rem 0 .7rem}
p{margin-bottom:1.1rem;color:#c8cce0;line-height:1.8}
ul,ol{padding-left:1.4rem;margin-bottom:1.1rem;color:#b8bcd6}
li{line-height:1.8;margin-bottom:.1rem}
strong{color:var(--text);font-weight:600}
code{font-family:var(--mono);font-size:.81rem;background:#1d2130;color:#7ab0ff;padding:2px 6px;border-radius:4px;border:1px solid var(--border)}
pre{background:var(--bg3);border:1px solid var(--border);border-radius:14px;padding:1.1rem 1.3rem;font-family:var(--mono);font-size:.8rem;overflow-x:auto;color:#c0d8ff;line-height:1.7;margin:.9rem 0;box-shadow:inset 0 1px 0 rgba(255,255,255,.03)}
.callout{border-radius:14px;padding:1.1rem 1.4rem;margin:.9rem 0;font-size:.88rem;line-height:1.65;display:flex;gap:.75rem;align-items:flex-start;transition:var(--smooth)}
.callout-icon{font-size:1.05rem;flex-shrink:0;margin-top:.05rem}
.callout.info{background:rgba(79,142,247,.08);border:1px solid rgba(79,142,247,.2);border-left:3px solid #4f8ef7;color:#9bbfff;box-shadow:inset 0 0 30px rgba(79,142,247,.03)}
.callout.ok{background:rgba(56,217,169,.07);border:1px solid rgba(56,217,169,.2);border-left:3px solid #38d9a9;color:#7de8c9;box-shadow:inset 0 0 30px rgba(56,217,169,.03)}
.callout.warn{background:rgba(247,201,72,.07);border:1px solid rgba(247,201,72,.2);border-left:3px solid #f7c948;color:#e8d47a;box-shadow:inset 0 0 30px rgba(247,201,72,.03)}
.callout.danger{background:rgba(247,107,107,.07);border:1px solid rgba(247,107,107,.2);border-left:3px solid #f76b6b;color:#f7a0a0;box-shadow:inset 0 0 30px rgba(247,107,107,.03)}
.tw{overflow-x:auto;margin:.9rem 0;border-radius:14px;border:1px solid var(--border);-webkit-overflow-scrolling:touch;box-shadow:0 2px 12px rgba(0,0,0,.15)}
table{width:100%;border-collapse:collapse;font-size:.87rem}
th{background:linear-gradient(135deg,var(--bg3),rgba(79,142,247,.04));font-weight:600;text-align:left;padding:13px 16px;border-bottom:1px solid var(--border);color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em}
td{padding:11px 16px;border-bottom:1px solid rgba(42,47,66,.5);color:#b8bcd6;vertical-align:top;line-height:1.55}
tr:last-child td{border-bottom:none}
tr:nth-child(even) td{background:rgba(255,255,255,.015)}
tr:hover td{background:rgba(79,142,247,.06);transition:background .2s}
.device-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:1.3rem;margin:1.5rem 0}
.device-card{background:rgba(27,32,49,.65);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border:1px solid var(--border);border-radius:var(--r);padding:1.3rem;transition:var(--smooth)}
.device-card:hover{border-color:rgba(79,142,247,.3);box-shadow:0 4px 20px rgba(0,0,0,.2),0 0 15px rgba(79,142,247,.08);transform:translateY(-3px) scale(1.005)}
.device-card-top{display:flex;align-items:flex-start;gap:1rem;margin-bottom:.9rem}
.device-svg-wrap{width:62px;height:62px;flex-shrink:0;background:linear-gradient(135deg,var(--bg3),rgba(79,142,247,.05));border-radius:10px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);transition:var(--smooth)}
.device-card:hover .device-svg-wrap{border-color:rgba(79,142,247,.25);box-shadow:0 0 12px rgba(79,142,247,.1)}
.device-info h3{margin:0 0 .3rem;font-size:.98rem;color:var(--text)}
.badges{display:flex;gap:.3rem;flex-wrap:wrap;margin-top:.3rem}
.badge{font-size:.7rem;padding:.15rem .6rem;border-radius:20px;font-weight:600}
.bl{background:rgba(79,142,247,.15);color:#7ab0ff;border:1px solid rgba(79,142,247,.25)}
.bobs{background:rgba(247,107,107,.1);color:#f7a0a0;border:1px solid rgba(247,107,107,.2)}
.bcur{background:rgba(56,217,169,.1);color:#7de8c9;border:1px solid rgba(56,217,169,.2)}
.bwarn{background:rgba(247,201,72,.1);color:#f7d96a;border:1px solid rgba(247,201,72,.2)}
.device-card ul{font-size:.84rem;color:var(--muted);margin:0;padding-left:1.2rem}
.device-card li{margin-bottom:.2rem}
.steps{counter-reset:s;display:flex;flex-direction:column;gap:.65rem;margin:.9rem 0}
.step{display:flex;gap:.9rem;align-items:flex-start}
.step::before{counter-increment:s;content:counter(s);width:26px;height:26px;border-radius:50%;background:var(--grad-accent);border:none;color:#fff;font-size:.76rem;font-weight:600;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-top:.2rem;font-family:var(--mono);box-shadow:0 0 10px rgba(79,142,247,.2)}
.step p{margin:0;font-size:.9rem;line-height:1.7;color:#c0c4d8}
.calc-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:1.5rem;margin:.9rem 0}
.calc-row{display:flex;gap:.75rem;margin-bottom:1rem;flex-wrap:wrap}
.calc-wrap input{flex:1;min-width:180px;background:var(--bg3);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:var(--mono);font-size:.92rem;padding:.55rem .95rem;outline:none;transition:var(--smooth)}
.calc-wrap input:focus,.lex-search:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(79,142,247,.12)}
.calc-btn{background:var(--grad-accent);border:none;color:#fff;font-family:var(--sans);font-size:.85rem;font-weight:600;padding:.55rem 1.2rem;border-radius:8px;cursor:pointer;transition:var(--smooth);box-shadow:0 2px 8px rgba(79,142,247,.2)}
.calc-btn:hover{transform:translateY(-1px);box-shadow:0 4px 15px rgba(79,142,247,.3)}
.calc-results{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:.6rem}
.cr{background:var(--bg3);border:1px solid var(--border);border-radius:8px;padding:.65rem .85rem;transition:var(--smooth)}
.cr:hover{border-color:rgba(79,142,247,.2);box-shadow:0 0 10px rgba(79,142,247,.05)}
.cr-l{font-size:.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em;margin-bottom:.2rem}
.cr-v{font-family:var(--mono);font-size:.9rem;font-weight:500;color:var(--accent);word-break:break-all}
.cr-v.g{color:var(--accent2)}.cr-v.y{color:var(--accent3)}
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.dns-box{background:var(--bg3);border:1px solid var(--border);border-radius:8px;padding:.4rem .8rem;font-size:.8rem;text-align:center;transition:all .5s cubic-bezier(.4,0,.2,1);white-space:nowrap}
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.arch-node{padding:.35rem .9rem;border-radius:20px;font-size:.8rem;font-weight:600;white-space:nowrap}
.arch-line{flex:1;min-width:16px;border-top:1.5px dashed var(--border);position:relative}
.arch-lbl{position:absolute;top:-17px;left:50%;transform:translateX(-50%);font-size:.66rem;color:var(--muted);white-space:nowrap;background:var(--bg);padding:0 4px}
.arch-desc{font-size:.8rem;color:var(--muted);margin:.1rem 0 .1rem 1rem;font-style:italic}
.lex-search{width:100%;background:var(--bg3);border:1px solid var(--border);border-radius:14px;color:var(--text);font-family:var(--sans);font-size:.92rem;padding:.7rem 1rem;outline:none;transition:var(--smooth);margin-bottom:1rem}
.lex-entries{display:flex;flex-direction:column;gap:0;background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden}
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.lex-entry:last-child{border-bottom:none}
.lex-entry.hidden{display:none}
.lex-term{padding:.8rem 1.1rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:.92rem;transition:background .2s;gap:.5rem}
.lex-term:hover{background:linear-gradient(135deg,rgba(79,142,247,.04),rgba(185,124,247,.02))}
.lex-left{display:flex;align-items:center;gap:.5rem;flex-wrap:wrap}
.lex-def{padding:0 1.1rem;max-height:0;overflow:hidden;transition:all .3s;font-size:.88rem;color:#b8bcd6;line-height:1.7}
.lex-def.open{padding:.15rem 1.1rem .85rem;max-height:500px}
.lex-arrow{color:var(--muted);transition:transform .3s;font-size:.78rem;flex-shrink:0}
.lex-entry.open .lex-arrow{transform:rotate(180deg)}
.lex-cat{font-size:.68rem;padding:.12rem .5rem;border-radius:20px;font-weight:600;min-width:78px;text-align:center;display:inline-block;transition:var(--smooth)}
.lc-hw{background:rgba(56,217,169,.1);color:#7de8c9;border:1px solid rgba(56,217,169,.2)}
.lc-ip{background:rgba(247,201,72,.1);color:#f7d96a;border:1px solid rgba(247,201,72,.2)}
.lc-proto{background:rgba(185,124,247,.1);color:#cc9cf9;border:1px solid rgba(185,124,247,.2)}
abbr{text-decoration:underline dotted var(--muted);cursor:help;color:inherit}
.cisco-tabs{display:flex;gap:.4rem;margin:1.5rem 0 1rem;border-bottom:1px solid var(--border)}
.cisco-tab{background:none;border:none;border-bottom:2px solid transparent;color:var(--muted);font-family:var(--sans);font-size:.88rem;font-weight:600;padding:.5rem 1rem .65rem;cursor:pointer;transition:var(--smooth);margin-bottom:-1px;position:relative;text-decoration:none}
.cisco-tab:hover{color:var(--text)}
.cisco-tab.active{color:var(--accent);border-bottom-color:transparent}
.cisco-tab.active::after{content:'';position:absolute;bottom:-1px;left:0;right:0;height:2px;background:var(--grad-accent);border-radius:2px}
.cisco-section{display:none}
.cisco-section.active{display:block}
.corr-unlock-btn{display:block;margin:1rem 0 0;padding:.55rem 1.2rem;background:linear-gradient(135deg,rgba(79,142,247,.1),rgba(185,124,247,.08));border:1px solid var(--border);border-radius:10px;color:var(--muted);font-family:var(--sans);font-size:.82rem;font-weight:600;cursor:pointer;transition:var(--smooth)}
.corr-unlock-btn:hover{border-color:var(--accent);color:var(--accent);background:rgba(79,142,247,.12)}
.corr-divider{height:1px;background:linear-gradient(to right,transparent,var(--border),transparent);margin:1.2rem 0}
.corr-title{color:var(--accent2);font-size:.9rem;margin-bottom:.7rem}
.corr-modal{position:fixed;inset:0;z-index:999;background:rgba(0,0,0,.7);backdrop-filter:blur(6px);display:flex;align-items:center;justify-content:center}
.corr-modal-box{background:var(--bg2);border:1px solid var(--border);border-radius:16px;padding:1.8rem;max-width:360px;width:90%}
.corr-modal-box h3{margin-bottom:.5rem;font-size:1.1rem}
.corr-modal-box p{font-size:.82rem;color:var(--muted);margin-bottom:.8rem}
.corr-modal-input{width:100%;padding:.6rem .9rem;background:var(--bg3);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:var(--mono);font-size:.88rem;outline:none;transition:var(--smooth)}
.corr-modal-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(79,142,247,.15)}
.corr-modal-error{color:var(--accent4);font-size:.78rem;margin-top:.4rem}
.corr-modal-btns{display:flex;gap:.6rem;margin-top:1rem;justify-content:flex-end}
.corr-modal-cancel,.corr-modal-ok{padding:.5rem 1.1rem;border-radius:8px;font-size:.82rem;font-weight:600;cursor:pointer;border:none;transition:var(--smooth)}
.corr-modal-cancel{background:var(--bg3);color:var(--muted)}
.corr-modal-cancel:hover{color:var(--text)}
.corr-modal-ok{background:var(--grad-accent);color:#fff}
.corr-modal-ok:hover{opacity:.9}
.cmd-block{background:var(--bg3);border:1px solid var(--border);border-radius:14px;margin:.7rem 0;overflow:hidden;box-shadow:0 2px 8px rgba(0,0,0,.15)}
.cmd-header{padding:.45rem 1rem;background:linear-gradient(135deg,rgba(79,142,247,.07),rgba(185,124,247,.04));border-bottom:1px solid var(--border);font-size:.76rem;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;display:flex;justify-content:space-between;align-items:center}
.cmd-header span{color:var(--accent3);font-family:var(--mono);text-transform:none;letter-spacing:0;font-size:.8rem}
.cmd-body{padding:.9rem 1.1rem;font-family:var(--mono);font-size:.8rem;color:#c0d8ff;line-height:1.7;white-space:pre;overflow-x:auto}
.cmd-c{color:#3d5070;font-style:italic}.cmd-p{color:var(--accent2)}.cmd-k{color:#7ab0ff}.cmd-v{color:#f7a0a0}.cmd-ok{color:var(--accent2)}
.band-viz{display:flex;flex-direction:column;gap:.45rem;margin:1rem 0}
.band-row{display:flex;align-items:center;gap:.7rem}
.band-label{width:70px;font-size:.78rem;color:var(--muted);text-align:right;flex-shrink:0}
.band-bar{height:26px;border-radius:5px;display:flex;align-items:center;padding:0 .75rem;font-size:.76rem;font-weight:600;overflow:hidden}
.ex-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:1.3rem 1.5rem;margin:1rem 0;transition:var(--smooth)}
.ex-card:hover{border-color:rgba(79,142,247,.2)}
.ex-head{display:flex;align-items:center;gap:.75rem;margin-bottom:1rem}
.ex-num{width:36px;height:36px;border-radius:50%;background:var(--grad-accent);border:none;color:#fff;font-family:var(--mono);font-size:.9rem;font-weight:600;display:flex;align-items:center;justify-content:center;flex-shrink:0;box-shadow:0 0 10px rgba(79,142,247,.2)}
.ex-card h3{margin:0;font-size:1rem;color:var(--text)}
.diff{font-size:.72rem;padding:.15rem .6rem;border-radius:20px;margin-left:.5rem}
.de{background:rgba(56,217,169,.1);color:#7de8c9;border:1px solid rgba(56,217,169,.2)}
.dm{background:rgba(247,201,72,.1);color:#f7d96a;border:1px solid rgba(247,201,72,.2)}
.dh{background:rgba(247,107,107,.1);color:#f7a0a0;border:1px solid rgba(247,107,107,.2)}
.corr-item{background:var(--bg3);border:1px solid var(--border);border-radius:14px;margin:.5rem 0;overflow:hidden;transition:var(--smooth)}
.corr-item:hover{border-color:rgba(79,142,247,.2)}
.corr-item.open{border-color:rgba(79,142,247,.25);box-shadow:0 2px 12px rgba(0,0,0,.15)}
.corr-q{padding:.8rem 1.1rem;cursor:pointer;font-size:.9rem;font-weight:600;display:flex;justify-content:space-between;align-items:center}
.corr-q:hover{background:linear-gradient(135deg,rgba(79,142,247,.04),rgba(185,124,247,.02))}
.corr-a{padding:0 1.1rem;max-height:0;overflow:hidden;transition:all .3s;font-size:.87rem;color:#b8bcd6;line-height:1.7}
.corr-a.open{padding:.15rem 1.1rem .8rem;max-height:5000px}
.corr-arrow{color:var(--muted);transition:transform .3s;font-size:.78rem}
.corr-item.open .corr-arrow{transform:rotate(180deg)}
.net-schema{overflow-x:auto;margin:1.2rem 0;border-radius:var(--r);border:1px solid var(--border);background:var(--card);padding:1rem}
.topo-diagram{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:1.2rem;margin:1rem 0;overflow-x:auto}
.topo-diagram h4{margin:0 0 .8rem;font-size:.78rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.config-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:.7rem;margin:.8rem 0}
.config-card{background:var(--bg3);border:1px solid var(--border);border-radius:10px;overflow:hidden;transition:var(--smooth)}
.config-card:hover{border-color:rgba(79,142,247,.15)}
.config-card-head{padding:.5rem .8rem;font-family:var(--mono);font-size:.85rem;font-weight:600;color:var(--text);background:rgba(79,142,247,.07);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:.5rem}
.config-icon{width:14px;height:14px;border-radius:3px;flex-shrink:0}
.config-icon.config-pc{background:rgba(74,80,112,.4);border:1.5px solid #4a5070}
.config-icon.config-router{background:rgba(79,142,247,.2);border:1.5px solid #4f8ef7;border-radius:50%}
.config-icon.config-switch{background:rgba(56,217,169,.15);border:1.5px solid #38d9a9;width:18px;height:12px}
.config-icon.config-server{background:rgba(185,124,247,.15);border:1.5px solid #b97cf7}
.config-card-body{padding:.5rem .8rem}
.config-row{display:flex;justify-content:space-between;align-items:center;padding:.2rem 0;font-size:.8rem;gap:.5rem}
.config-row+.config-row{border-top:1px solid rgba(42,47,66,.4)}
.config-key{color:var(--muted);font-size:.75rem;font-weight:500;white-space:nowrap}
.config-val{font-family:var(--mono);font-size:.78rem;color:var(--accent);text-align:right}
.config-iface{font-family:var(--mono);font-size:.72rem;color:var(--accent3);text-transform:uppercase;letter-spacing:.04em;padding:.35rem 0 .1rem;margin-top:.3rem;border-top:1px dashed rgba(42,47,66,.6)}
.config-iface:first-child{border-top:none;margin-top:0}
pre:hover{border-color:rgba(79,142,247,.15);box-shadow:0 2px 12px rgba(0,0,0,.15)}
.callout:hover{transform:translateX(3px)}
.page-nav{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;padding-top:2rem;border-top:1px solid var(--border)}
.page-nav-btn{display:flex;align-items:center;gap:.75rem;padding:1rem 1.3rem;background:var(--card);border:1px solid var(--border);border-radius:var(--r);text-decoration:none;color:inherit;transition:var(--smooth);flex:1;max-width:48%}
.page-nav-btn:hover{border-color:rgba(79,142,247,.3);transform:translateY(-2px);box-shadow:0 4px 20px rgba(0,0,0,.2)}
.page-nav-btn.prev{flex-direction:row-reverse}
.page-nav-btn.next{margin-left:auto}
.page-nav-arrow{font-size:1.3rem;color:var(--accent);flex-shrink:0}
.page-nav-dir{display:block;font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;font-weight:600}
.page-nav-title{display:block;font-size:.92rem;font-weight:600;color:var(--text);margin-top:.15rem}
@media(max-width:768px){
.nav-links{-webkit-mask-image:linear-gradient(to right,transparent 0,#000 8px,#000 calc(100% - 16px),transparent 100%);mask-image:linear-gradient(to right,transparent 0,#000 8px,#000 calc(100% - 16px),transparent 100%)}
.nav-btn{font-size:.76rem;padding:.3rem .65rem}
}
@media(max-width:640px){
body{font-size:15.5px;line-height:1.75}
nav{height:52px}
.nav-inner{padding:0 .75rem}
.nav-logo{font-size:.95rem;margin-right:.75rem}
.nav-links{-webkit-mask-image:linear-gradient(to right,transparent 0,#000 12px,#000 calc(100% - 20px),transparent 100%);mask-image:linear-gradient(to right,transparent 0,#000 12px,#000 calc(100% - 20px),transparent 100%);padding:0 8px 0 4px;scroll-snap-type:x mandatory}
.nav-btn{font-size:.72rem;padding:.35rem .6rem;scroll-snap-align:start;flex-shrink:0}
.page{padding-top:64px}
.container{padding:1rem 1rem 3rem}
.hero{padding:1.5rem .5rem 1.2rem}
.hero::before{width:300px;height:150px}
.hero-title{font-size:1.85rem;line-height:1.2}
.hero-sub{font-size:.9rem}
.hero-tags{gap:.35rem}
.home-grid{grid-template-columns:1fr}
.section-title{font-size:1.5rem}
h2{font-size:1.1rem;margin:2.5rem 0 .9rem}
h3{font-size:.95rem;margin:2rem 0 .7rem}
.device-grid{grid-template-columns:1fr}
.config-cards{grid-template-columns:1fr}
svg{min-width:0!important;width:100%!important;height:auto}
.topo-diagram,.net-schema{padding:.75rem}
.cmd-body{white-space:pre-wrap;word-break:break-all;padding:.7rem .85rem;font-size:.75rem}
pre{font-size:.74rem;padding:.85rem 1rem;white-space:pre-wrap;word-break:break-all}
code{font-size:.76rem;word-break:break-all}
td,th{padding:7px 10px;font-size:.8rem}
th{font-size:.72rem}
.steps{gap:.5rem}
.step{gap:.6rem}
.step::before{width:22px;height:22px;font-size:.7rem}
.step p{font-size:.84rem}
.dns-chain{flex-direction:column;align-items:stretch;gap:.4rem}
.dns-arrow{transform:rotate(90deg);text-align:center;padding:0}
.dns-box{width:100%}
.calc-results{grid-template-columns:repeat(2,1fr)}
.calc-row{flex-direction:column}
.calc-wrap input{min-width:0;width:100%}
.cisco-tabs{overflow-x:auto;scrollbar-width:none;-webkit-mask-image:linear-gradient(to right,#000 calc(100% - 16px),transparent 100%);mask-image:linear-gradient(to right,#000 calc(100% - 16px),transparent 100%)}
.cisco-tabs::-webkit-scrollbar{display:none}
.cisco-tab{font-size:.8rem;padding:.4rem .75rem .55rem;white-space:nowrap}
.ex-card{padding:1rem 1.1rem}
.lex-term{padding:.65rem .85rem;font-size:.86rem}
.lex-def.open{padding:.1rem .85rem .7rem}
.band-row{gap:.4rem}
.band-label{width:55px;font-size:.72rem}
.page-nav{flex-direction:column}
.page-nav-btn{max-width:100%}
}
@media(max-width:480px){
.hero-title{font-size:1.6rem}
.tag{font-size:.7rem;padding:.22rem .65rem}
.calc-results{grid-template-columns:1fr}
.home-card{padding:1rem}
.home-card h3{font-size:.88rem}
.section-title{font-size:1.35rem}
.ex-card{padding:.85rem .9rem}
}