/* =========================================================================
   azelainovaya-kislota-site.ru — сайт под кластер «Свойства азелаиновой кислоты».
   Без внешних шрифтов, без JS, без сетевых зависимостей.
   ========================================================================= */

:root{
  --paper:#FFFFFF;
  --tint:#F6F8F7;
  --ink:#1B2430;
  --muted:#5F6B72;
  --line:#E1E6E4;
  --accent:#2A6B5F;
  --accent-soft:#EAF2F0;
  --warn-bg:#FFF8E9;
  --warn-line:#DDA83A;

  --measure:68ch;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}

body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:18px;line-height:1.7;
}

.wrap{max-width:820px;margin:0 auto;padding:0 1.3rem}

a{color:var(--accent);text-underline-offset:.16em}
a:hover{color:var(--ink)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

.skip-link{position:absolute;left:-9999px;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:10}
.skip-link:focus{left:0}

/* ---------- шапка / подвал ---------------------------------------------- */

.site-header{border-bottom:1px solid var(--line);background:var(--tint)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:baseline;gap:.5rem 1.5rem;padding:.95rem 1.3rem}
.brand{font-weight:640;font-size:1.02rem;color:var(--ink);text-decoration:none;letter-spacing:-.01em}
.brand span{display:block;font-weight:400;font-size:.8rem;color:var(--muted);letter-spacing:0}
.nav{margin-left:auto;display:flex;flex-wrap:wrap;gap:.15rem 1.1rem;font-size:.92rem}
.nav a{color:var(--muted);text-decoration:none;padding:.1rem 0;border-bottom:2px solid transparent}
.nav a:hover{color:var(--ink)}
.nav a[aria-current="page"]{color:var(--ink);border-bottom-color:var(--accent)}

.crumbs{font-size:.85rem;color:var(--muted);padding:.85rem 0 0}
.crumbs a{color:var(--muted)}

.site-footer{background:var(--tint);border-top:1px solid var(--line);margin-top:2.5rem;padding:1.6rem 0;font-size:.88rem;color:var(--muted)}
.site-footer p{max-width:var(--measure)}
.foot-nav{display:flex;flex-wrap:wrap;gap:.2rem 1.1rem;margin-bottom:.7rem}
.site-footer a{color:var(--muted)}

/* ---------- текст --------------------------------------------------------- */

main{padding:1.6rem 0 0}

h1{font-size:clamp(1.6rem,1.15rem + 1.7vw,2.25rem);line-height:1.2;letter-spacing:-.018em;font-weight:650;margin:0 0 .6rem;max-width:22ch}
article h1{max-width:none}
h2{font-size:1.28rem;line-height:1.33;font-weight:640;margin:2.1rem 0 .6rem;max-width:var(--measure)}
h3{font-size:1.03rem;font-weight:640;margin:1.4rem 0 .3rem}
p,ul,ol{max-width:var(--measure)}
p{margin:0 0 1rem}
li{margin-bottom:.35rem}
.lead{font-size:1.1rem;line-height:1.6;color:var(--ink);margin-bottom:1.4rem}
.muted{color:var(--muted)}
.small{font-size:.88rem}

/* ---------- метаданные материала ------------------------------------------ */

.meta{
  font-size:.86rem;color:var(--muted);border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);padding:.7rem 0;margin:0 0 1.5rem;max-width:var(--measure)
}
.meta div{margin-bottom:.15rem}
.meta div:last-child{margin-bottom:0}
.meta b{color:var(--ink);font-weight:600}

/* ---------- дисклеймер ----------------------------------------------------- */

.disclaimer{
  background:var(--warn-bg);border-left:3px solid var(--warn-line);
  padding:.9rem 1.1rem;margin:1.8rem 0;max-width:var(--measure);font-size:.93rem
}
.disclaimer p{margin:0}
.disclaimer b{font-weight:640}

.note{background:var(--accent-soft);border-left:3px solid var(--accent);padding:.9rem 1.1rem;margin:1.6rem 0;max-width:var(--measure)}
.note :last-child{margin-bottom:0}

/* ---------- схемы ----------------------------------------------------------- */

figure{margin:1.6rem 0;max-width:var(--measure)}
figure img,figure svg{width:100%;height:auto;display:block;border:1px solid var(--line);border-radius:3px}
figcaption{font-size:.84rem;color:var(--muted);margin-top:.45rem}

/* ---------- таблица ---------------------------------------------------------- */

.tbl-wrap{overflow-x:auto;margin:1.4rem 0;max-width:var(--measure)}
table{border-collapse:collapse;width:100%;min-width:520px;font-size:.93rem}
th,td{border:1px solid var(--line);padding:.55rem .7rem;text-align:left;vertical-align:top}
th{background:var(--accent-soft);font-weight:640}

/* ---------- анонсы материалов -------------------------------------------------- */

.cards{list-style:none;margin:0;padding:0;max-width:none;border-top:1px solid var(--line)}
.cards li{border-bottom:1px solid var(--line)}
.cards a{display:block;padding:1rem 0;text-decoration:none;color:inherit}
.cards a:hover .c-title{color:var(--accent);text-decoration:underline}
.c-title{font-weight:600;line-height:1.4;display:block;max-width:var(--measure)}
.c-desc{color:var(--muted);font-size:.92rem;margin-top:.25rem;display:block;max-width:var(--measure)}

/* ---------- вопрос-ответ --------------------------------------------------------- */

.qa{max-width:var(--measure);border-top:1px solid var(--line)}
.qa details{border-bottom:1px solid var(--line)}
.qa summary{cursor:pointer;padding:.8rem 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:1rem}
.qa summary::-webkit-details-marker{display:none}
.qa summary::after{content:"+";color:var(--accent);font-weight:400}
.qa details[open] summary::after{content:"–"}
.qa .a{padding:0 0 .9rem}
.qa .a p:last-child{margin-bottom:0}

/* ---------- эксперт ------------------------------------------------------------- */

.spec{margin:1.2rem 0;border-top:1px solid var(--line);max-width:var(--measure)}
.spec .row{display:grid;grid-template-columns:200px 1fr;gap:1.6rem;padding:.65rem 0;border-bottom:1px solid var(--line)}
.spec dt{color:var(--muted);font-size:.9rem;margin:0}
.spec dd{margin:0}

/* ---------- источники ------------------------------------------------------------ */

.sources{font-size:.88rem;color:var(--muted)}
.sources li{margin-bottom:.4rem}

@media (max-width:700px){
  body{font-size:17px}
  .spec .row{grid-template-columns:1fr;gap:.15rem}
  .nav{margin-left:0;width:100%}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}