/* Лист проекта: слева — оглавление как в альбоме чертежей; справа — листы со штампом; план — чертёж с осями */
:root{
  --paper:#eef1f4; --sheet:#ffffff; --ink:#15202b; --muted:#5a6672; --line:#d3dae2; --soft:#e6ebf0;
  --signal:#cf2a1f; --signal-soft:#fbe6e3; --ok:#1d7447; --ok-soft:#e1f2e8; --warn:#9a5d00; --warn-soft:#fbefd9;
  --cover:rgba(207,42,31,.07); --cover-edge:rgba(207,42,31,.35); --wall:#15202b; --nozone:#dfe4ea; --scrim:rgba(10,15,20,.45);
  --f-display:"Unbounded","Golos Text",system-ui,sans-serif;
  --f-body:"Golos Text",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --r:10px; --side:272px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --paper:#0e1318; --sheet:#151c23; --ink:#e4e9ee; --muted:#97a3ae; --line:#2b3540; --soft:#1c252e;
  --signal:#ff5d50; --signal-soft:#3a1b19; --ok:#48c486; --ok-soft:#15301f; --warn:#f0a63b; --warn-soft:#352812;
  --cover:rgba(255,93,80,.10); --cover-edge:rgba(255,93,80,.45); --wall:#dfe6ec; --nozone:#232d37; --scrim:rgba(0,0,0,.6); color-scheme:dark}}
:root[data-theme="dark"]{
  --paper:#0e1318; --sheet:#151c23; --ink:#e4e9ee; --muted:#97a3ae; --line:#2b3540; --soft:#1c252e;
  --signal:#ff5d50; --signal-soft:#3a1b19; --ok:#48c486; --ok-soft:#15301f; --warn:#f0a63b; --warn-soft:#352812;
  --cover:rgba(255,93,80,.10); --cover-edge:rgba(255,93,80,.45); --wall:#dfe6ec; --nozone:#232d37; --scrim:rgba(0,0,0,.6); color-scheme:dark}

*{box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.55}
h1,h2,h3,h4{text-wrap:balance;margin:0}
h1{font-family:var(--f-display);font-weight:700;font-size:clamp(1.4rem,4.6vw,2rem);letter-spacing:-.01em;line-height:1.15}
h2{font-family:var(--f-display);font-weight:500;font-size:clamp(1.12rem,3.4vw,1.4rem);line-height:1.25}
h3{font-size:1.05rem;font-weight:600}
h4{font-size:.98rem;font-weight:600}
p{margin:0}
a{color:var(--signal)}
ul,ol{margin:0;padding-left:20px;display:grid;gap:6px}
.mono{font-family:var(--f-mono);font-size:.86em}
.muted{color:var(--muted)}
.eyebrow{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

/* каркас: боковое меню + контент */
.app{display:grid;grid-template-columns:var(--side) minmax(0,1fr);min-height:100%}
.side-nav{position:sticky;top:env(safe-area-inset-top,0px);height:100vh;overflow-y:auto;border-right:1px solid var(--line);background:var(--sheet);padding-block:18px 32px;padding-inline:14px;display:grid;align-content:start;gap:18px}
.logo{display:flex;gap:10px;align-items:center;padding-inline:6px}
.logo i{width:14px;height:14px;background:var(--signal);border-radius:2px;flex:none}
.logo b{font-family:var(--f-display);font-weight:700;font-size:1rem;letter-spacing:-.01em}
.nav-group{display:grid;gap:2px}
.nav-group > .eyebrow{padding:0 8px 6px}
.nav-link{display:flex;gap:10px;align-items:center;width:100%;text-align:left;border:0;background:transparent;color:var(--ink);font:inherit;font-size:.9rem;padding:7px 8px;border-radius:6px;cursor:pointer;line-height:1.3}
.nav-link:hover{background:var(--soft)}
.nav-link[aria-current="page"]{background:var(--ink);color:var(--sheet)}
.nav-link[disabled]{color:var(--muted);cursor:default;background:transparent}
.nav-link .n{flex:none;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;border:1px solid var(--line);font-family:var(--f-mono);font-size:.7rem}
.nav-link[aria-current="page"] .n{border-color:var(--sheet)}
.nav-link.done .n{background:var(--ok);border-color:var(--ok);color:#fff}
.nav-link .tag{margin-left:auto;font-family:var(--f-mono);font-size:.62rem;color:var(--muted);text-transform:uppercase;letter-spacing:.05em}
.progress{padding-inline:8px;display:grid;gap:6px}
.bar{height:6px;border-radius:3px;background:var(--soft);overflow:hidden}
.bar i{display:block;height:100%;background:var(--ok);width:0}

.topbar{display:none}
.main{padding-inline:clamp(16px,3.5vw,40px);padding-block:24px 56px;min-width:0}
.content{max-width:940px;margin:0 auto;display:grid;gap:18px}
.scrim{display:none}

@media (max-width:900px){
  .app{grid-template-columns:minmax(0,1fr)}
  .side-nav{position:fixed;left:0;top:0;bottom:0;height:auto;width:min(86vw,320px);z-index:30;transform:translateX(-102%);transition:transform .22s ease;padding-top:calc(18px + env(safe-area-inset-top,0px));box-shadow:0 0 40px rgba(0,0,0,.2)}
  .side-nav.open{transform:none}
  .scrim.open{display:block;position:fixed;inset:0;background:var(--scrim);z-index:25}
  .topbar{display:flex;position:sticky;top:env(safe-area-inset-top,0px);z-index:20;gap:12px;align-items:center;background:var(--sheet);border-bottom:1px solid var(--line);padding:10px 16px}
  .topbar .where{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.9rem}
  .menu-btn{flex:none;display:flex;gap:8px;align-items:center;border:1px solid var(--line);background:var(--soft);color:var(--ink);font:inherit;font-size:.88rem;font-weight:500;padding:7px 12px;border-radius:6px;cursor:pointer}
}

/* лист */
.sheet{background:var(--sheet);border:1px solid var(--line);border-radius:var(--r);padding:clamp(16px,4vw,28px);display:grid;gap:22px}
.sheet-head{display:flex;flex-wrap:wrap;gap:12px 20px;justify-content:space-between;align-items:flex-start}
.sheet-head > div:first-child{min-width:0;flex:1 1 300px;display:grid;gap:8px}
.stamp{font-family:var(--f-mono);font-size:.7rem;border:1.5px solid var(--ink);display:grid;grid-template-columns:auto auto;min-width:200px}
.stamp span{padding:3px 8px;border-right:1px solid var(--ink);border-bottom:1px solid var(--ink)}
.stamp span:nth-child(2n){border-right:0}
.stamp span:nth-last-child(-n+2){border-bottom:0}
.stamp b{font-weight:600}
.prose{display:grid;gap:12px;max-width:68ch}
.section{display:grid;gap:12px}
.section + .section{border-top:1px solid var(--line);padding-top:20px}

.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px}
table{border-collapse:collapse;width:100%;font-size:.92rem;min-width:520px}
th,td{text-align:left;padding:8px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);font-weight:400;background:var(--soft)}
tr:last-child td{border-bottom:0}
td.num{font-variant-numeric:tabular-nums;font-family:var(--f-mono);font-size:.86rem;white-space:nowrap}
tfoot td{font-weight:600;background:var(--soft)}

.norms{display:grid;gap:14px}
.norm{border:1px solid var(--line);border-radius:8px;padding:16px;display:grid;gap:10px}
.norm-top{display:flex;flex-wrap:wrap;gap:6px 12px;align-items:baseline;justify-content:space-between}
.ref{font-family:var(--f-mono);font-size:.74rem;color:var(--signal);border:1px solid var(--cover-edge);border-radius:4px;padding:1px 6px;white-space:nowrap}
.answer{display:flex;gap:10px;align-items:flex-start;background:var(--soft);border-radius:6px;padding:10px 12px}
.answer b{white-space:nowrap}
details{border-top:1px dashed var(--line);padding-top:8px}
summary{cursor:pointer;color:var(--muted);font-size:.88rem}
blockquote{margin:8px 0 0;padding:8px 12px;border-left:3px solid var(--line);font-size:.9rem;color:var(--muted)}
blockquote p+p{margin-top:6px}
.new{font-family:var(--f-mono);font-size:.64rem;background:var(--signal);color:#fff;padding:1px 6px;border-radius:3px;letter-spacing:.04em;text-transform:uppercase;vertical-align:2px}
.why{border-left:3px solid var(--ink);padding:4px 0 4px 14px;display:grid;gap:6px}
.why .eyebrow{color:var(--ink)}
.practice-hint{display:grid;grid-template-columns:auto minmax(0,1fr);gap:10px;align-items:start;background:var(--warn-soft);border-radius:6px;padding:10px 12px;font-size:.92rem}
.practice-hint b.k{font-family:var(--f-mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.05em;color:var(--warn);padding-top:3px}

.quiz{border:1.5px solid var(--ink);border-radius:8px;padding:16px;display:grid;gap:12px}
.opts{display:grid;gap:8px}
.opt{display:flex;gap:10px;align-items:flex-start;text-align:left;border:1px solid var(--line);background:var(--sheet);color:var(--ink);border-radius:6px;padding:10px 12px;font:inherit;cursor:pointer}
.opt:hover{border-color:var(--muted)}
.opt .k{font-family:var(--f-mono);font-weight:600;min-width:2.6em}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}
.opt.wrong{border-color:var(--signal);background:var(--signal-soft)}
.fb{font-size:.92rem;border-radius:6px;padding:10px 12px}
.fb.ok{background:var(--ok-soft);border-left:3px solid var(--ok)}
.fb.bad{background:var(--signal-soft);border-left:3px solid var(--signal)}
.checks{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:8px}
.chk{display:flex;gap:10px;align-items:center;border:1px solid var(--line);border-radius:6px;padding:9px 12px;cursor:pointer}
.chk input{width:18px;height:18px;accent-color:var(--ink);margin:0}
.chk.right{border-color:var(--ok);background:var(--ok-soft)}
.chk.wrong{border-color:var(--signal);background:var(--signal-soft)}

.btn{font:inherit;font-size:.92rem;border:1px solid var(--ink);background:var(--ink);color:var(--sheet);border-radius:6px;padding:9px 14px;cursor:pointer;font-weight:500}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--ink)}
.btn.red{background:var(--signal);border-color:var(--signal);color:#fff}
.row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.nav-foot{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;border-top:1px solid var(--line);padding-top:16px}
button:focus-visible,summary:focus-visible,a:focus-visible,label:focus-within,input:focus-visible{outline:2px solid var(--signal);outline-offset:2px}

/* тренажёр */
.lab{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:18px;align-items:start}
@media (max-width:1100px){.lab{grid-template-columns:minmax(0,1fr)}}
.toolbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:space-between}
.seg{display:inline-flex;border:1px solid var(--line);border-radius:8px;overflow:hidden;background:var(--soft);flex-wrap:wrap}
.seg button{font:inherit;font-size:.86rem;border:0;background:transparent;color:var(--ink);padding:8px 12px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--sheet)}
.plan-box{border:1px solid var(--line);border-radius:8px;background:var(--sheet);overflow:hidden;touch-action:manipulation}
#plan{display:block;width:100%;height:auto;cursor:crosshair;user-select:none;-webkit-user-select:none}
.plan-meta{display:flex;flex-wrap:wrap;gap:6px 14px;justify-content:space-between;font-family:var(--f-mono);font-size:.72rem;color:var(--muted);padding:8px 12px;border-top:1px solid var(--line)}
.side{display:grid;gap:14px}
.panel{border:1px solid var(--line);border-radius:8px;padding:14px;display:grid;gap:10px}
.tally{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tally div{background:var(--soft);border-radius:6px;padding:8px 10px}
.tally b{display:block;font-family:var(--f-display);font-size:1.35rem;font-variant-numeric:tabular-nums;line-height:1.2}
.tally span{font-size:.78rem;color:var(--muted)}
.results{display:grid;gap:8px;max-height:520px;overflow:auto}
.res{display:grid;grid-template-columns:auto minmax(0,1fr);gap:8px;font-size:.88rem;align-items:start}
.pill{font-family:var(--f-mono);font-size:.64rem;text-transform:uppercase;letter-spacing:.05em;padding:2px 6px;border-radius:3px;margin-top:2px;white-space:nowrap}
.pill.err{background:var(--signal);color:#fff}
.pill.warn{background:var(--warn-soft);color:var(--warn);border:1px solid var(--warn)}
.pill.ok{background:var(--ok-soft);color:var(--ok);border:1px solid var(--ok)}
.pill.info{background:var(--soft);color:var(--muted);border:1px solid var(--line)}
.switch{display:flex;gap:8px;align-items:center;font-size:.88rem;cursor:pointer}
.switch input{width:18px;height:18px;accent-color:var(--signal);margin:0}
.legend{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:.8rem;color:var(--muted)}
.legend span{display:inline-flex;gap:6px;align-items:center}
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--sheet);padding:9px 14px;border-radius:6px;font-size:.88rem;max-width:calc(100% - 32px);z-index:40}

/* оборудование */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.dev{border:1px solid var(--line);border-radius:8px;padding:14px;display:grid;gap:8px;align-content:start}
.dev-head{display:flex;gap:12px;align-items:flex-start}
.dev-ill{margin:0;background:var(--soft);border-radius:6px;padding:8px;display:grid;place-items:center}
.dev-ill svg{width:100%;max-width:220px;height:auto}
.dev-ico{flex:none;width:44px;height:44px;border-radius:8px;background:var(--soft);display:grid;place-items:center}
.dev-head > div{min-width:0;display:grid;gap:2px}
.dev .role{font-size:.84rem;color:var(--muted)}
.spec{display:grid;grid-template-columns:auto minmax(0,1fr);gap:4px 12px;font-size:.86rem}
.spec dt{color:var(--muted)}
.spec dd{margin:0;font-family:var(--f-mono);font-size:.82rem}
.variant{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:12px}
.vcard{border:1px solid var(--line);border-radius:8px;padding:14px;display:grid;gap:8px;text-align:left;background:var(--sheet);color:var(--ink);font:inherit;cursor:pointer}
.vcard[aria-pressed="true"]{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}
.vcard .eyebrow{color:var(--signal)}
.meter{display:grid;gap:6px}
.meter .bar{height:10px}
.meter .bar i.warn{background:var(--warn)}
.meter .bar i.err{background:var(--signal)}
.stepper{display:inline-flex;align-items:center;border:1px solid var(--line);border-radius:6px;overflow:hidden}
.stepper button{border:0;background:var(--soft);color:var(--ink);font:inherit;width:34px;height:32px;cursor:pointer}
.stepper output{min-width:40px;text-align:center;font-family:var(--f-mono);font-variant-numeric:tabular-nums}

/* практика */
.case{border:1px solid var(--line);border-radius:8px;padding:16px;display:grid;gap:10px}
.case-top{display:flex;flex-wrap:wrap;gap:6px 12px;justify-content:space-between;align-items:baseline}
.case dl{display:grid;gap:10px;margin:0}
.case dt{font-family:var(--f-mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.case dd{margin:2px 0 0}
.lcd{background:#2f4a3a;color:#dff3e4;font-family:var(--f-mono);font-size:.86rem;border-radius:6px;padding:10px 12px;display:grid;gap:6px;border:3px solid var(--line)}
.lcd span{color:#9fd3ae}
.lcd small{display:block;color:#a9c7b3;font-size:.74rem}
.lesson{background:var(--ok-soft);border-left:3px solid var(--ok);border-radius:0 6px 6px 0;padding:10px 12px;font-size:.93rem}

.fig{border:1px solid var(--line);border-radius:8px;padding:12px;display:grid;gap:8px;background:var(--sheet)}
.fig svg{width:100%;height:auto;display:block}
.fig figcaption{font-size:.84rem;color:var(--muted)}
figure{margin:0}
.two{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px}
.gloss{display:grid;gap:0;margin:0}
.gloss div{display:grid;grid-template-columns:minmax(90px,150px) minmax(0,1fr);gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.gloss dt{font-family:var(--f-mono);font-weight:600;font-size:.9rem}
.gloss dd{margin:0;font-size:.94rem}
.locked-note{border:1px dashed var(--line);border-radius:8px;padding:16px;display:grid;gap:8px}
.foot{font-size:.82rem;color:var(--muted);display:grid;gap:6px;max-width:80ch;margin-top:8px}
/* главная и меню v6 */
.logo{border:0;background:transparent;color:var(--ink);font:inherit;cursor:pointer;text-align:left;padding-block:4px}
.nav-search{width:100%;font:inherit;font-size:.88rem;border:1px solid var(--line);background:var(--soft);color:var(--ink);border-radius:6px;padding:8px 10px}
.nav-search::placeholder{color:var(--muted)}
.nav-home{font-weight:600}
.side-nav{overflow-x:hidden}
.nav-head,.nav-link{min-width:0}
.nav-sec{display:block;padding:14px 8px 4px;font-size:.66rem;color:var(--muted)}
.nav-home svg,.nav-head svg{flex:none;color:var(--muted)}
.nav-home[aria-current="page"] svg{color:var(--sheet)}
.nav-head{display:flex;gap:10px;align-items:center;width:100%;border:0;background:transparent;color:var(--ink);font:inherit;font-size:.88rem;font-weight:600;padding:8px;border-radius:6px;cursor:pointer;text-align:left;line-height:1.3}
.nav-head:hover{background:var(--soft)}
.nav-head .cnt{margin-left:auto;font-family:var(--f-mono);font-size:.68rem;color:var(--muted);font-weight:400}
.nav-head .tag{margin-left:auto;font-family:var(--f-mono);font-size:.6rem;text-transform:uppercase;letter-spacing:.05em;color:var(--signal);border:1px solid var(--cover-edge);border-radius:3px;padding:1px 4px;font-weight:400}
.nav-head .chev{flex:none;transition:transform .15s}
.nav-head .tag + .chev,.nav-head .cnt + .chev{margin-left:0}
.nav-head > span:nth-child(2){flex:1;min-width:0}
.nav-head[aria-expanded="true"] .chev{transform:rotate(180deg)}
.nav-items[hidden]{display:none}
.nav-items{display:grid;gap:1px;padding-left:12px;margin-left:8px;border-left:1px solid var(--line)}
.nav-items .dot{flex:none;width:6px;height:6px;border-radius:50%;background:var(--line);margin-inline:8px}
.nav-link[aria-current="page"] .dot{background:var(--sheet)}
.home{display:grid;gap:28px;min-width:0}
.home > *,.block > *{min-width:0}
.hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:28px;align-items:center;background:var(--sheet);border:1px solid var(--line);border-radius:var(--r);padding:clamp(20px,4vw,40px)}
.hero-text{display:grid;gap:16px;min-width:0}
.hero h1{font-size:clamp(1.6rem,4.6vw,2.3rem);line-height:1.08}
.lead{font-size:1.04rem;max-width:58ch;margin:0}
.hero-art svg{width:100%;height:auto;display:block}
.trust{font-size:.88rem;color:var(--muted);display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:0}
.linkbtn{border:0;background:none;padding:0;font:inherit;color:var(--signal);text-decoration:underline;cursor:pointer}
.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.stats div{background:var(--sheet);border:1px solid var(--line);border-radius:8px;padding:14px;display:grid;gap:4px}
.stats b{font-family:var(--f-display);font-size:1.9rem;font-weight:700;line-height:1;color:var(--signal)}
.stats span{font-size:.86rem;color:var(--muted)}
.block{display:grid;gap:12px}
.block > p{margin:0}
.map svg{min-width:560px}
.map{overflow-x:auto}
.mnode{cursor:pointer}
.mnode:hover rect:first-child,.mnode:focus rect:first-child{fill:var(--soft)}
.mnode:focus{outline:none}
.auds,.plans,.trustgrid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.aud,.plan{background:var(--sheet);border:1px solid var(--line);border-radius:10px;padding:18px;display:grid;gap:10px;align-content:start}
.aud ul,.plan ul{margin:0;padding-left:18px;display:grid;gap:6px;font-size:.92rem}
.aud .btn{justify-self:start;margin-top:4px}
.aud h3,.plan h3{font-family:var(--f-display);font-weight:600;font-size:1.08rem}
.plan.accent{border:2px solid var(--signal)}
.plan p{margin:0}
.trustgrid div{border-top:3px solid var(--ink);padding-top:10px;display:grid;gap:6px}
.trustgrid h4{font-size:.98rem}
.trustgrid p{margin:0;font-size:.92rem;color:var(--muted)}
.disclaimer{font-size:.82rem;color:var(--muted);margin:0}
@media (max-width:900px){.hero{grid-template-columns:minmax(0,1fr)}.hero-art{max-width:360px}.auds,.plans,.trustgrid{grid-template-columns:minmax(0,1fr)}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

.author-card{display:flex;gap:18px;align-items:center;background:var(--sheet);border:1px solid var(--line);border-radius:var(--r);padding:clamp(16px,3vw,24px)}
.author-card h3{font-family:var(--f-display);font-weight:600;font-size:1.2rem;margin:4px 0 6px}
.author-mark{flex:none;width:64px;height:64px;border-radius:50%;background:var(--signal);color:#fff;display:grid;place-items:center;font-family:var(--f-display);font-weight:700;font-size:1.2rem}
.foot-author{color:var(--ink)}
@media (max-width:520px){.author-card{flex-direction:column;align-items:flex-start}}
.author-photo{flex:none;width:84px;height:84px;border-radius:50%;object-fit:cover;border:2px solid var(--signal);background:var(--soft)}