/* Длинная база — общий стиль. Шрифты хранятся на этом же домене. */

@font-face{font-family:"Unbounded";font-style:normal;font-weight:200 900;font-display:swap;
  src:url("/assets/fonts/unbounded-cyrillic.woff2") format("woff2");
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Unbounded";font-style:normal;font-weight:200 900;font-display:swap;
  src:url("/assets/fonts/unbounded-latin.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Onest";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("/assets/fonts/onest-cyrillic.woff2") format("woff2");
  unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Onest";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("/assets/fonts/onest-latin.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --vellum:#e6ebee;
  --paper:#f6f8f9;
  --ink:#0f1f2c;
  --ink-2:#233746;
  --slate:#566877;
  --hair:#b9c4cc;
  --amber:#f2b705;
  --amber-soft:rgba(242,183,5,.22);
  --display:"Unbounded","Onest",system-ui,sans-serif;
  --text:"Onest",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --gutter:clamp(16px,4vw,40px);
  --max:1180px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--vellum);color:var(--ink);
  font:400 1.0625rem/1.65 var(--text);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg{display:block;max-width:100%}
figure{margin:0}
a{color:inherit;text-decoration-line:underline;text-decoration-color:var(--amber);
  text-decoration-thickness:.18em;text-underline-offset:.22em}
a:hover{text-decoration-color:var(--ink)}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.on-ink :focus-visible,.site-foot :focus-visible{outline-color:var(--amber)}

h1,h2,h3{margin:0;font-weight:700;text-wrap:balance}
h1,h2{font-family:var(--display);letter-spacing:-.025em;line-height:1.1}
h1{font-size:clamp(1.9rem,4.6vw,3.7rem);font-weight:800;line-height:1.06;letter-spacing:-.03em}
h2{font-size:clamp(1.4rem,2.6vw,2.1rem)}
h3{font-size:1.2rem;line-height:1.3;letter-spacing:-.01em}
p{margin:0 0 1em}
strong{font-weight:700}

.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:var(--vellum);padding:8px 14px;z-index:10}
.skip:focus{left:8px}
.wrap{width:100%;max-width:calc(var(--max) + 2*var(--gutter));margin-inline:auto;padding-inline:var(--gutter)}

/* Шапка */
.site-head{border-bottom:1px solid var(--hair)}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-block:18px}
.brand{display:inline-flex;align-items:center;gap:12px;font-family:var(--display);font-weight:800;
  font-size:1.05rem;letter-spacing:-.02em;text-decoration:none;white-space:nowrap}
.brand-mark{width:40px;height:16px;color:var(--ink)}
.nav ul{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:2px 22px;list-style:none;margin:0;padding:0}
.nav a{display:block;padding:6px 0;text-decoration:none;font-weight:500;font-size:.96rem;
  border-bottom:3px solid transparent}
.nav a:hover{border-bottom-color:var(--hair)}
.nav a[aria-current="page"]{border-bottom-color:var(--amber);font-weight:700}
@media(max-width:900px){
  .head-row{flex-direction:column;align-items:flex-start;gap:8px}
  .nav ul{justify-content:flex-start}
}

/* Первый экран */
.hero{padding-block:clamp(40px,7vw,92px) clamp(40px,6vw,80px)}
.hero h1{max-width:19ch}
.lead{font-size:clamp(1.1rem,1.6vw,1.28rem);line-height:1.55;max-width:58ch;color:var(--ink-2);margin:24px 0 0}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px 28px;margin-top:32px}
.btn{display:inline-block;background:var(--amber);color:var(--ink);font-weight:700;padding:14px 24px;
  border:2px solid var(--ink);border-radius:2px;text-decoration:none;
  transition:transform .15s ease,box-shadow .15s ease}
.btn:hover{transform:translate(-2px,-2px);box-shadow:3px 3px 0 var(--ink)}

.drafting{margin-top:clamp(32px,5vw,56px);background-color:var(--paper);
  background-image:linear-gradient(rgba(15,31,44,.08) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(15,31,44,.08) 1px,transparent 1px);
  background-size:28px 28px;background-position:-1px -1px;
  border:1px solid var(--ink);padding:clamp(10px,2vw,28px)}
.diagram-scroll{overflow-x:auto}
.diagram{min-width:640px;width:100%;height:auto}
.diagram.fluid{min-width:0}
.diagram.ruler{max-width:780px}
@media(max-width:700px){
  .diagram{min-width:560px}
  .diagram.fluid{min-width:0}
  .diagram-scroll.rtl{direction:rtl}
  .diagram-scroll.rtl .diagram{direction:ltr}
}
figcaption{margin-top:14px;font-size:.92rem;color:var(--slate);max-width:72ch}

/* Графика колёсной базы */
.d-wheel{fill:var(--paper);stroke:var(--ink);stroke-width:4}
.d-wheel-std{fill:none;stroke:var(--slate);stroke-width:3;stroke-dasharray:8 7}
.d-hub{fill:none;stroke:var(--ink);stroke-width:3}
.d-dot{fill:var(--ink)}
.d-link{stroke:var(--slate);stroke-width:2;stroke-dasharray:3 6}
.d-guide{stroke:var(--slate);stroke-width:1.5;stroke-dasharray:5 6}
.d-guide-solid{stroke:var(--ink);stroke-width:2}
.d-band{fill:var(--amber);opacity:.45}
.d-dim{stroke:var(--ink);stroke-width:2.5}
.d-dim-std{stroke:var(--slate)}
.d-ext{stroke:var(--amber);stroke-width:14}
.d-label{font:600 22px var(--text);fill:var(--ink)}
.d-label-sm{font:500 19px var(--text);fill:var(--slate)}
.d-tag-bg{fill:var(--amber);stroke:var(--ink);stroke-width:2}
.d-tag{font:800 21px var(--display);fill:var(--ink);letter-spacing:-.03em}
.d-anim{transform-box:fill-box;transform-origin:0 50%}
.d-grow{animation:grow 1.4s .5s cubic-bezier(.2,.8,.2,1) both}
.d-slide{animation:slide 1.4s .5s cubic-bezier(.2,.8,.2,1) both}
@keyframes grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes slide{from{transform:translateX(-22px)}to{transform:translateX(0)}}
@media(prefers-reduced-motion:reduce){.d-grow,.d-slide{animation:none}html{scroll-behavior:auto}}

/* Линейка на странице характеристик */
.l-grid{stroke:var(--hair);stroke-width:1}
.l-axis{stroke:var(--ink);stroke-width:2}
.l-bar{stroke:var(--slate);stroke-width:4}
.l-bar-li{stroke:var(--ink);stroke-width:4}
.l-dot{fill:var(--paper);stroke:var(--slate);stroke-width:4}
.l-dot-li{fill:var(--amber);stroke:var(--ink);stroke-width:4}
.l-name{font:600 20px var(--text);fill:var(--ink)}
.l-val{font:700 20px var(--text);fill:var(--ink)}
.l-tick{font:500 17px var(--text);fill:var(--slate)}
.facts.terms div{grid-template-columns:11rem minmax(0,1fr)}
.facts.terms dt{color:var(--ink);font-weight:700;font-size:1.02rem}
.facts.terms dd{font-weight:400;max-width:60ch}
@media(max-width:640px){.terms div{grid-template-columns:1fr;gap:4px}}

/* Секции */
.section{padding-block:clamp(48px,7vw,96px)}
.hero + .section{padding-top:clamp(8px,2vw,24px)}
.section + .section{border-top:1px solid var(--hair)}
.section-head{max-width:60ch;margin-bottom:clamp(24px,4vw,44px)}
.section-head p{color:var(--slate);margin:14px 0 0}
.on-ink{background:var(--ink);color:var(--vellum);border-top:0 !important}
.on-ink a{text-decoration-color:var(--amber)}
.on-ink a:hover{text-decoration-color:var(--vellum)}
.on-ink .section-head p,.on-ink .muted{color:#a9b9c4}

.split{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(0,1fr);gap:clamp(28px,6vw,80px);align-items:start}
.cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:clamp(32px,5vw,72px)}
@media(max-width:820px){.split,.cols{grid-template-columns:1fr}}

.facts{margin:0;border-top:2px solid var(--ink)}
.facts div{display:grid;grid-template-columns:9rem minmax(0,1fr);gap:16px;padding:12px 0;border-bottom:1px solid var(--hair)}
.facts dt{color:var(--slate);font-size:.95rem}
.facts dd{margin:0;font-weight:600}

.era{border-top:3px solid var(--ink);padding-top:18px}
.era-code{font-family:var(--display);font-weight:800;font-size:clamp(2.6rem,6vw,4.4rem);line-height:1;letter-spacing:-.045em}
.era-years{color:var(--slate);font-weight:600;margin:10px 0 18px}
.era p{max-width:48ch}

/* Тексты */
.prose{max-width:66ch}
.prose h2{margin:2.2em 0 .6em}
.prose > h2:first-child{margin-top:0}
.prose h3{margin:1.8em 0 .4em}
.prose ul,.prose ol{padding:0;margin:0 0 1.2em;list-style:none}
.prose ul li{position:relative;padding-left:1.5em;margin:.5em 0}
.prose ul li::before{content:"";position:absolute;left:0;top:.82em;width:.8em;height:3px;background:var(--amber)}
.prose ol{counter-reset:n}
.prose ol li{counter-increment:n;position:relative;padding-left:2.3em;margin:.7em 0}
.prose ol li::before{content:counter(n);position:absolute;left:0;top:.08em;font-family:var(--display);font-weight:800;font-size:.95rem}
.note{border-left:6px solid var(--amber);background:var(--paper);padding:16px 20px;margin:1.6em 0;max-width:66ch}
.note p:last-child{margin-bottom:0}
.wide{max-width:none}

/* Таблицы */
.table-wrap{overflow-x:auto;margin:1.4em 0 2em;border-top:2px solid var(--ink)}
table.data{width:100%;border-collapse:collapse;min-width:620px;font-variant-numeric:tabular-nums}
.data caption{caption-side:bottom;text-align:left;color:var(--slate);font-size:.9rem;padding-top:10px}
.data th,.data td{text-align:left;padding:12px 16px 12px 0;border-bottom:1px solid var(--hair);vertical-align:top}
.data thead th{font-size:.88rem;color:var(--slate);font-weight:600;border-bottom:2px solid var(--ink)}
.data tbody th{font-weight:700}
.data tr.hl th,.data tr.hl td{background:var(--amber-soft)}
.data tr.hl th{box-shadow:inset 5px 0 0 var(--amber);padding-left:14px}

/* Хронология */
.timeline{list-style:none;margin:0;padding:0 0 0 0;border-left:3px solid var(--ink);max-width:70ch}
.timeline li{position:relative;padding:0 0 32px 30px}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{content:"";position:absolute;left:-11px;top:.55em;width:19px;height:19px;
  background:var(--amber);border:3px solid var(--ink);border-radius:50%}
.timeline .yr{display:block;font-family:var(--display);font-weight:800;font-size:1.35rem;letter-spacing:-.03em;margin-bottom:4px}

/* Ряды со ссылками: журнал, главная */
.rows{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}
.rows li{display:grid;grid-template-columns:9rem minmax(0,1fr);gap:8px 28px;padding:22px 0;border-bottom:1px solid var(--hair)}
.rows time,.rows .tag{color:var(--slate);font-size:.95rem;padding-top:.4em}
.rows h3{font-family:var(--display);font-weight:700;font-size:clamp(1.05rem,1.8vw,1.35rem);line-height:1.25;letter-spacing:-.02em}
.rows h3 a{text-decoration:none}
.rows h3 a:hover{text-decoration:underline;text-decoration-color:var(--amber);text-decoration-thickness:.14em;text-underline-offset:.2em}
.rows p{margin:8px 0 0;max-width:62ch}
.rows .read{display:block;margin-top:8px;color:var(--slate);font-size:.9rem}
.on-ink .rows{border-top-color:var(--amber)}
.on-ink .rows li{border-bottom-color:#2e4657}
.on-ink .rows time,.on-ink .rows .tag{color:#a9b9c4}
@media(max-width:640px){.rows li{grid-template-columns:1fr;gap:4px}}
.more{margin:28px 0 0;font-weight:600}

/* Вопросы */
.faq{border-top:2px solid var(--ink);max-width:80ch}
.faq details{border-bottom:1px solid var(--hair)}
.faq summary{cursor:pointer;list-style:none;position:relative;padding:20px 52px 20px 0;font-weight:700;font-size:1.1rem;line-height:1.4}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:8px;top:50%;translate:0 -50%;
  font-family:var(--display);font-weight:600;font-size:1.5rem;transition:rotate .2s ease}
.faq details[open] summary::after{rotate:45deg}
.faq .ans{padding:0 52px 22px 0;color:var(--ink-2)}
.faq .ans p:last-child{margin-bottom:0}

/* Статья */
.art-head{padding-block:clamp(36px,6vw,76px) clamp(20px,3vw,32px)}
.art-head h1{font-size:clamp(1.7rem,3.8vw,2.9rem);max-width:21ch}
.art-meta{display:flex;flex-wrap:wrap;gap:6px 26px;margin-top:20px;color:var(--slate);font-size:.95rem}
.crumbs{margin:0 0 20px;font-size:.92rem;color:var(--slate)}
.crumbs a{text-decoration:none;border-bottom:2px solid var(--amber)}
.art-body{padding-bottom:clamp(48px,7vw,96px)}
.art-lead{font-size:1.2rem;line-height:1.6;color:var(--ink-2);max-width:60ch;margin-bottom:1.6em}
.next{border-top:2px solid var(--ink);margin-top:56px;padding-top:20px;max-width:66ch}
.next p{margin:0 0 6px;color:var(--slate);font-size:.95rem}
.next a{font-family:var(--display);font-weight:700;font-size:1.15rem;letter-spacing:-.02em;line-height:1.3}

/* Страница 404 */
.nf{padding-block:clamp(40px,8vw,104px)}
.nf h1{max-width:15ch}
.link-rows{list-style:none;margin:36px 0 0;padding:0;border-top:2px solid var(--ink);max-width:680px}
.link-rows a{display:flex;justify-content:space-between;gap:16px;padding:14px 8px 14px 0;border-bottom:1px solid var(--hair);
  text-decoration:none;font-weight:600}
.link-rows a:hover{background:var(--amber-soft);padding-left:10px}
.link-rows span{color:var(--slate);font-weight:400;text-align:right}

/* Подвал */
.site-foot{background:var(--ink);color:var(--vellum);padding-block:52px 38px}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1.3fr;gap:36px}
.site-foot h2{font-family:var(--display);font-size:.98rem;letter-spacing:-.01em;margin-bottom:14px;line-height:1.25}
.site-foot p{color:#a9b9c4;max-width:38ch;margin:0}
.site-foot ul{list-style:none;margin:0;padding:0}
.site-foot li{margin:7px 0}
.site-foot a{text-decoration-color:transparent}
.site-foot a:hover{text-decoration-color:var(--amber)}
.site-foot .legal{margin-top:40px;padding-top:20px;border-top:1px solid #2e4657;color:#a9b9c4;font-size:.9rem;max-width:84ch}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr}}