/* Эксплуатация Linux-сервера · ОП.05. Обзор и три технических задания; палитра занятий 3–8. */
:root{
  --ground:#EDE9E2; --card:#FFFDF9; --ink:#1E1420; --muted:#6A5C65; --line:#D6CDC2;
  --hero:#161B33; --hero-ink:#E6E9F5; --term:#2C0B26; --term-ink:#F3E9EF; --mark:#FFD36B; --accent:#F2A65A;
  --display:'Geologica','Golos Text',system-ui,sans-serif; --body:'Golos Text',system-ui,sans-serif; --mono:'JetBrains Mono',ui-monospace,Menlo,monospace;
  --c:#2F5D8C;
}
*{box-sizing:border-box}
body{margin:0;background:var(--ground);color:var(--ink);font:17px/1.7 var(--body);-webkit-font-smoothing:antialiased}
a{color:inherit;text-underline-offset:4px}
code,pre{font-family:var(--mono);font-size:.88em}
p code,li code,td code,dd code{background:#fff8;border:1px solid var(--line);padding:0 .3em;border-radius:3px;overflow-wrap:anywhere}
:focus-visible{outline:3px solid var(--mark);outline-offset:3px}
button{font:inherit;cursor:pointer}
h1,h2,h3{font-family:var(--display);line-height:1.15}
.wrap{max-width:1040px;margin:0 auto;padding-inline:28px}

.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;gap:18px;padding:10px 28px;background:var(--hero);color:var(--hero-ink)}
.brand{display:grid;place-items:center;width:44px;height:44px;border:1px solid #fff4;text-decoration:none;font:700 11px var(--mono)}
.name{font:700 16px var(--display);text-decoration:none}
.topbar nav{display:flex;gap:4px;margin-left:auto}
.topbar nav a{padding:5px 10px;text-decoration:none;font:600 12px var(--mono);border-bottom:4px solid var(--c);color:#C9CDE0}
.topbar nav a[aria-current]{background:var(--c);color:#fff}

.cover{background:var(--hero);color:var(--hero-ink);border-bottom:8px solid var(--c);background-image:radial-gradient(circle at 85% 20%,#3D4B8C66,transparent 45%)}
.cover .wrap{padding-block:56px 48px}
.kicker{font:600 12px var(--mono);letter-spacing:.12em;text-transform:uppercase;color:#BFC5DE;margin:0}
.cover h1{font-size:clamp(32px,5vw,58px);margin:.3em 0 .4em;font-weight:800;max-width:22ch}
.sub{font-size:19px;max-width:62ch;color:#D3D8EC;margin:0}
.meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1px;margin:20px 0 0;background:#fff2;border:1px solid #fff2}
.meta div{background:var(--hero);padding:10px 14px}
.meta dt{font:600 11px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#9AA1C2}
.meta dd{margin:2px 0 0;font-size:15px;line-height:1.45}

.page{padding-block:10px 60px}
.page>section{margin-top:48px}
.page h2{font-size:clamp(24px,3vw,32px);margin:0 0 14px}
.page h3{font-size:20px;margin:28px 0 10px}
.page p{max-width:74ch}

.cards{list-style:none;margin:0;padding:0;display:grid;gap:14px}
.cards a{display:grid;gap:6px;padding:20px 22px;background:var(--card);border:2px solid var(--ink);border-left:10px solid var(--c);text-decoration:none;box-shadow:6px 6px 0 var(--line)}
.cards a:hover{transform:translate(2px,2px);box-shadow:4px 4px 0 var(--line)}
.cards .num{font:700 12px var(--mono);color:var(--c);letter-spacing:.08em}
.cards b{font:700 22px/1.25 var(--display)}
.cards p{margin:0;color:var(--muted)}
.tags{display:flex;flex-wrap:wrap;gap:6px}
.tags i{font:500 12px var(--mono);font-style:normal;padding:2px 8px;border:1px solid var(--line);background:#fff}

.steps{counter-reset:s;list-style:none;padding:0;margin:0;display:grid;gap:10px}
.steps li{counter-increment:s;position:relative;padding:12px 16px 12px 58px;background:var(--card);border:1px solid var(--line)}
.steps li::before{content:counter(s);position:absolute;left:14px;top:12px;width:30px;height:30px;display:grid;place-items:center;background:var(--ink);color:#fff;font:700 14px var(--mono)}
.plain{padding-left:20px}.plain li{margin:6px 0}

.crit{list-style:none;padding:0;display:grid;gap:6px}
.crit li{display:grid;grid-template-columns:44px 1fr;gap:12px;align-items:start;padding:10px 14px;background:var(--card);border:1px solid var(--line)}
.crit b{font:700 20px var(--mono);color:var(--c)}

.req{list-style:none;padding:0;margin:0;display:grid;gap:6px}
.req li{display:grid;grid-template-columns:52px 1fr;gap:10px;padding:10px 14px;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--c)}
.req span{font:700 14px var(--mono);color:var(--c);padding-top:2px}
.req div{max-width:72ch}

.split{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px}
.split li{display:grid;gap:6px;align-content:start;padding:14px 16px;background:var(--card);border:2px solid var(--ink)}
.split b{font:700 16px var(--display)}

.tbl{overflow-x:auto;border:1px solid var(--line);background:var(--card)}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;vertical-align:top;padding:9px 12px;border-bottom:1px solid var(--line)}
th{font:600 12px var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted);background:#F6F2EC}
tr:last-child td{border-bottom:0}
td:first-child{white-space:nowrap}

.term{position:relative;margin:12px 0;background:var(--term);color:var(--term-ink)}
.term pre{margin:0;padding:14px 16px;overflow-x:auto;font-size:14px;line-height:1.6}
.copy{position:absolute;top:8px;right:8px;background:none;border:1px solid #fff5;color:var(--term-ink);font:500 11px var(--mono);padding:2px 8px}
.print{margin-top:20px;padding:10px 18px;background:var(--accent);border:2px solid var(--ink);font:700 15px var(--display)}

.foot{background:var(--hero);color:#9AA1C2;font:500 12px var(--mono)}
.foot .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;padding-block:22px}

@media (max-width:640px){
  .wrap{padding-inline:16px}.topbar{padding:8px 16px;gap:10px;flex-wrap:wrap}.name{font-size:14px}
  .topbar nav{margin-left:0}.req li{grid-template-columns:40px 1fr}td:first-child{white-space:normal}
}
@media print{
  .topbar,.foot,.copy,.print{display:none}
  body{background:#fff;font-size:12pt}.cover{background:#fff;color:#000;border-bottom:3px solid #000}
  .cover h1,.sub,.kicker{color:#000}.meta,.meta div{background:#fff;color:#000}.meta dt{color:#444}
  .term{background:#f3f3f3;color:#000}.cards a,.split li{box-shadow:none}
  .req li,.split li,.crit li{break-inside:avoid}
}
.mats{list-style:none;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:10px}
.mats a{display:grid;gap:4px;height:100%;padding:14px 16px;background:var(--card);border:2px solid var(--ink);text-decoration:none}
.mats b{font:700 17px var(--display)}.mats span{color:var(--muted);font-size:15px;line-height:1.5}
details.hint{margin:8px 0;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--c)}
details.hint summary{cursor:pointer;padding:10px 14px;font:600 16px var(--display)}
details.hint p{margin:0 14px 10px}details.hint .lec{font:500 13px var(--mono);color:var(--muted)}
details.hint .chk b{margin-right:8px;font:600 11px var(--mono);text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
kbd{font-family:var(--mono);font-size:.85em;border:1px solid var(--ink);border-bottom-width:3px;padding:0 .35em;border-radius:4px;background:var(--card)}
@media print{details.hint{display:none}}
@media (max-width:640px){
  .stack thead{display:none}
  .stack tr{display:block;padding:10px 12px;border-bottom:1px solid var(--line)}
  .stack td{display:block;padding:2px 0;border:0;white-space:normal}
  .stack td:first-child{font-weight:600}
  .stack td code{white-space:pre-wrap}
}

/* Страница ТЗ: разделы в порядке PDF-версии (tz/export.mjs). */
.cover-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px 16px;margin:22px 0 0}
.cover-actions span{font-size:14px;color:#BFC5DE}
.btn{display:inline-block;padding:10px 18px;background:var(--accent);color:var(--ink);border:2px solid var(--ink);font:700 15px var(--display);text-decoration:none}
.btn:hover{background:var(--mark)}
.toc{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:4px 18px;margin-top:34px;padding:16px 20px;background:var(--card);border:1px solid var(--line);border-top:4px solid var(--c)}
.toc a{font-size:15px;text-decoration:none;padding:2px 0}.toc a:hover{text-decoration:underline}
.tzdoc .part{margin-top:56px;scroll-margin-top:80px}
.tzdoc h2{padding-bottom:8px;border-bottom:3px solid var(--c);margin-top:48px;scroll-margin-top:80px}
.tzdoc .part>h2:first-child,.tzdoc .part>.keep-block:first-child>h2:first-child{margin-top:0}
.tzdoc h3{scroll-margin-top:80px}
.tzdoc ol:not(.req),.tzdoc ul{padding-left:22px;max-width:76ch}.tzdoc li{margin:5px 0}
.tzdoc .tbl{margin:10px 0 16px}
.tzdoc td:first-child{white-space:normal}
.tzdoc .tests td:first-child,.tzdoc .opt td:first-child,.tzdoc .acc td:first-child{white-space:nowrap}
.tzdoc .note.top{font-size:15px;color:var(--muted);border-left:4px solid var(--c);padding:4px 0 4px 14px;max-width:76ch}
.tzdoc p.hint{font-size:14px;color:var(--muted)}
.tzdoc .about td:first-child{width:150px}.tzdoc .acc td:last-child{font:600 13px var(--mono);color:var(--c);white-space:nowrap}
.tzdoc .acc code.en{background:none;border:0;padding:0}
.tzdoc .flow{display:block;max-width:820px;margin:12px 0 4px;background:var(--card);border:1px solid var(--line);padding:10px}
.tzdoc .tree{margin:10px 0;padding:14px 16px;background:var(--card);border:1px solid var(--line);font-size:14px;line-height:1.6;overflow-x:auto}
.tzdoc .reg{margin:14px 0;padding:14px 18px;background:var(--card);border:1px solid var(--line)}
.tzdoc .reg h3{margin:0 0 4px;color:var(--c)}.tzdoc .reg-h{font-weight:600;margin:10px 0 2px}
.fiction{margin-top:40px;font:500 12px var(--mono);color:var(--muted)}

/* Письмо Заказчика — бланк компании. */
.doc{position:relative;margin-top:36px;padding:34px 40px 30px;background:#fff;border:1px solid var(--line);box-shadow:0 1px 0 var(--line),8px 8px 0 #0000000d;font-family:'PT Sans',var(--body);scroll-margin-top:80px}
.letterhead{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-bottom:12px;border-bottom:3px solid var(--c);margin-bottom:22px}
.lh-brand{display:flex;align-items:center;gap:12px}
.lh-name{font:700 25px/1 var(--display);letter-spacing:.12em;color:#2b2f36}
.lh-tag{font-size:13px;color:var(--muted);margin-top:4px}
.lh-req{font-size:11.5px;line-height:1.45;color:#4a5260;text-align:right}
.doc .cover-top{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;min-height:190px}
.doc .outno{font-size:14px;color:#4a5260}
.doc .approve{position:relative;width:300px;font-size:15px;line-height:1.5}
.doc .approve-h{font-weight:700;letter-spacing:.2em;margin-bottom:4px}
.doc .sign-line{position:relative;display:flex;align-items:flex-end;gap:8px;height:44px}
.doc .sign-line .line{width:110px;border-bottom:1px solid #333}
.doc .sig-wrap{position:absolute;left:-8px;bottom:-10px;z-index:2}
.doc .approve .seal-wrap{position:absolute;left:-90px;top:36px;z-index:3;mix-blend-mode:multiply;pointer-events:none}
.doc .letter-to{text-align:right;font-size:14px;color:#4a5260;margin-top:10px}
.doc h2.plain{border:0;padding:0;margin:18px 0 10px;font-size:24px}
.doc p{max-width:none}
.facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px;margin:22px 0}
.facts div{border:1px solid var(--line);border-top:3px solid var(--c);padding:12px 14px;background:#fff}
.facts b{display:block;font:700 26px/1.2 var(--display)}.facts span{font-size:14px;color:var(--muted);line-height:1.4;display:block}
.letter-sign{display:grid;grid-template-columns:1fr 260px 140px;align-items:center;min-height:120px;margin-top:10px;font-size:15px}
.letter-sign .sig-wrap{position:relative;left:0;bottom:0}
.letter-sign .seal-wrap{position:absolute;left:50px;top:-50px;z-index:3;mix-blend-mode:multiply;pointer-events:none}

/* Карточка заявки. */
.ticket{margin:10px 0 16px;padding:16px 20px 8px;background:var(--card);border:1px solid var(--line);border-left:6px solid var(--c)}
.t-head{display:flex;flex-wrap:wrap;gap:4px 14px;align-items:baseline;font:600 19px/1.35 var(--display);margin-bottom:6px}
.t-head b{font:700 15px var(--mono);color:var(--c)}
.t-meta{display:flex;flex-wrap:wrap;gap:4px 20px;font-size:13.5px;color:var(--muted);padding-bottom:8px;margin-bottom:10px;border-bottom:1px dashed var(--line)}

@media (max-width:760px){
  .doc{padding:22px 18px}
  .letterhead{flex-direction:column;align-items:flex-start}.lh-req{text-align:left}
  .doc .cover-top{flex-direction:column;min-height:0}.doc .approve{margin:4px 0 40px 90px;width:auto}
  .letter-sign{grid-template-columns:1fr;gap:6px;min-height:0}.letter-sign .sig-wrap{height:90px}
}
@media print{
  .toc,.cover-actions,.fiction{display:none}.doc{box-shadow:none;border:0;padding:0}
  .tzdoc .part,.ticket,.reg{break-inside:auto}.tzdoc h2{break-after:avoid}
}
.tzdoc .servers td:first-child,.tzdoc .timeline td:first-child,.tzdoc .stages td:nth-child(2),.tzdoc .deliver td:first-child,.tzdoc .opt td:nth-child(2),.tzdoc .release td:first-child{white-space:nowrap}
.tzdoc .deliver td:first-child code,.tzdoc .opt td:nth-child(2) code,.tzdoc .release td:first-child code{overflow-wrap:normal}
.tzdoc .pairsplit td:first-child{width:240px}
@media (max-width:640px){.tzdoc .deliver td:first-child,.tzdoc .opt td:nth-child(2),.tzdoc .release td:first-child{white-space:normal}}
.flow-wrap{overflow-x:auto;max-width:820px}.flow-wrap .flow{min-width:620px}
@media (max-width:640px){.tzdoc .stack td:first-child{width:auto}.doc .approve{margin-left:70px}}
.tzdoc .lead{font-size:18px}
.tzdoc .bridge{margin-top:22px;padding:12px 16px;background:var(--card);border-left:4px solid var(--c);color:var(--muted);font-size:16px}
.tzdoc .part>h2{font-size:clamp(28px,3.4vw,38px)}
.tzdoc .part+.part{border-top:1px solid var(--line);padding-top:48px}