:root{
  --bg:#ffffff; --panel:#f6f6f4; --card:#ffffff; --ink:#0a0a0b; --muted:#6a7078; --line:#e6e7ea;
  --bar:#0e0f12; --bar-ink:#ffffff;
  --accent:#e39b21; --accent-ink:#3a2a05; --accent-soft:#fdf3e0;
  --ok:#0f7b46;
  --shadow:0 1px 2px rgba(15,18,25,.06),0 10px 30px rgba(15,18,25,.07);
  --radius:14px; --maxw:980px;
  color-scheme:light dark;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0d0f12; --panel:#14171c; --card:#151a20; --ink:#eceff3; --muted:#9aa3af; --line:#242a32;
    --bar:#05060a; --bar-ink:#f2f4f7; --accent:#f0ad3c; --accent-ink:#241a05; --accent-soft:#241d10;
    --ok:#37c98a; --shadow:0 1px 2px rgba(0,0,0,.5),0 12px 30px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
  --bg:#0d0f12; --panel:#14171c; --card:#151a20; --ink:#eceff3; --muted:#9aa3af; --line:#242a32;
  --bar:#05060a; --bar-ink:#f2f4f7; --accent:#f0ad3c; --accent-ink:#241a05; --accent-soft:#241d10;
  --ok:#37c98a; --shadow:0 1px 2px rgba(0,0,0,.5),0 12px 30px rgba(0,0,0,.4);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;-webkit-text-size-adjust:100%;-webkit-font-smoothing:antialiased}
a{color:var(--ink);text-decoration:none}
a:hover{color:var(--accent)}
img{max-width:100%}
[hidden]{display:none!important}
.wrap{max-width:var(--maxw);margin:0 auto;padding:16px}

/* ---------- Шапка «как на сайте»: чёрная полоса, разрядный логотип ---------- */
header.site{background:var(--bar);color:var(--bar-ink);position:sticky;top:env(safe-area-inset-top,0px);z-index:20;border-bottom:1px solid rgba(255,255,255,.06)}
header.site .wrap{display:flex;align-items:center;gap:14px;padding-top:14px;padding-bottom:14px;max-width:1200px}
header.site .nav{display:flex;gap:4px;margin-left:8px;overflow-x:auto;scrollbar-width:none}
header.site .nav::-webkit-scrollbar{display:none}
header.site .nav a{color:rgba(255,255,255,.78);font-size:14px;font-weight:500;padding:7px 11px;border-radius:8px;white-space:nowrap;transition:color .15s,background .15s}
header.site .nav a:hover{color:#fff;background:rgba(255,255,255,.07)}
header.site .nav a.on{color:var(--accent);background:rgba(240,173,60,.1)}
header.site .logo{color:var(--bar-ink);font-weight:700;font-size:15px;letter-spacing:.16em;text-transform:uppercase;display:inline-flex;align-items:center;gap:10px;white-space:nowrap}
header.site .logo:hover{color:var(--bar-ink)}
header.site .logo b{color:var(--accent);font-weight:700}
header.site .logo .mk{width:22px;height:22px;color:var(--accent);flex:0 0 auto;animation:spin 14s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.search{margin-left:auto;flex:1;max-width:400px}
.search input{width:100%;padding:10px 14px;border:1px solid rgba(255,255,255,.14);border-radius:10px;background:rgba(255,255,255,.06);color:var(--bar-ink);font-size:15px;transition:border-color .15s,background .15s}
.search input::placeholder{color:rgba(255,255,255,.5)}
.search input:focus{outline:none;border-color:var(--accent);background:rgba(255,255,255,.1)}

/* ---------- Заголовки ---------- */
h1{font-size:27px;line-height:1.2;margin:20px 0 6px;letter-spacing:-.01em}
.lead{color:var(--muted);margin:0 0 18px;max-width:70ch}
.crumbs{color:var(--muted);font-size:13px;margin:16px 0 0}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--accent)}
.count{color:var(--muted);font-size:14px;margin-bottom:6px}

/* ---------- Баннер каталога ---------- */
.hero{position:relative;background:linear-gradient(180deg,var(--panel),var(--bg));border:1px solid var(--line);border-radius:18px;padding:22px 22px 8px;margin:16px 0 6px;overflow:hidden}
.hero h1{margin-top:0}
.hero .hero-svg{display:block;width:100%;max-width:420px;height:auto;color:var(--muted);margin:4px auto 6px}
/* цикл 8 с: размеры → кладка → стрелка → результат → пауза → сброс */
.hero-svg text{font:600 10px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;fill:currentColor;stroke:none}
.hero-svg .dim{animation:h-dim 8s ease infinite}
.hero-svg .brick{fill:var(--accent);opacity:0;transform-box:fill-box;transform-origin:center bottom;animation:h-brick 8s cubic-bezier(.2,.7,.3,1) infinite}
.hero-svg .arrow{color:var(--accent);opacity:0;animation:h-arrow 8s ease infinite}
.hero-svg .result{opacity:0;animation:h-res 8s ease infinite}
.hero-svg .result rect{fill:var(--accent-soft);stroke:var(--accent);stroke-width:1.5}
.hero-svg .result .rv{font-size:17px;font-weight:800;fill:var(--accent)}
.hero-svg .result .rl{font-size:8.5px;font-weight:500;fill:var(--muted)}
@keyframes h-dim{0%{opacity:0}5%,88%{opacity:1}96%,100%{opacity:0}}
@keyframes h-brick{0%{opacity:0;transform:translateY(-6px) scale(.9)}4%{opacity:.9;transform:none}62%{opacity:.9}72%,100%{opacity:0}}
@keyframes h-arrow{0%,40%{opacity:0;transform:translateX(-6px)}46%,88%{opacity:1;transform:none}96%,100%{opacity:0}}
@keyframes h-res{0%,44%{opacity:0;transform:scale(.92)}50%,88%{opacity:1;transform:none}96%,100%{opacity:0}}
.hero-svg .arrow,.hero-svg .result{transform-box:fill-box;transform-origin:center}
@media (prefers-reduced-motion:reduce){.hero-svg .brick{opacity:.9}.hero-svg .arrow,.hero-svg .result,.hero-svg .dim{opacity:1}}

/* ---------- Каталог: ширина как у шапки ---------- */
body[data-page="catalog"] main.wrap{max-width:1200px}

/* навигатор по категориям */
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 4px}
.chip{display:inline-flex;align-items:center;gap:7px;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:6px 12px 6px 9px;font-size:13.5px;font-weight:600;color:var(--ink);white-space:nowrap;transition:border-color .15s,background .15s,color .15s}
.chip .ci{width:17px;height:17px;color:var(--accent);display:inline-flex}.chip .ci svg{width:17px;height:17px}
.chip .n{font-size:11.5px;font-weight:700;color:var(--muted);background:var(--panel);border-radius:999px;padding:1px 7px}
.chip:hover{border-color:var(--accent);color:var(--ink);background:var(--accent-soft)}
@media(min-width:901px){.chips{position:sticky;top:67px;z-index:10;background:var(--bg);padding:10px 0;margin:6px 0 0;border-bottom:1px solid var(--line)}}
@media(max-width:900px){.chips{flex-wrap:nowrap;overflow-x:auto;scrollbar-width:none;margin-right:-16px;padding-right:16px}.chips::-webkit-scrollbar{display:none}}

/* ---------- Категории и плитки ---------- */
.group{scroll-margin-top:130px}
.cat{margin:30px 0 12px;font-size:13px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);font-weight:800;display:flex;align-items:center;gap:9px;line-height:1.2}
h2.cat{font-size:13px}
.cat .ci{width:20px;height:20px;color:var(--accent);flex:0 0 auto}
.cat .n{font-size:11.5px;letter-spacing:0;color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:1px 8px;font-weight:700}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px}
.tile{display:flex;gap:12px;align-items:flex-start;min-height:92px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:14px 15px;box-shadow:var(--shadow);transition:transform .14s cubic-bezier(.2,.7,.3,1),border-color .15s,box-shadow .15s;opacity:0;transform:translateY(10px)}
.tile .d{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.more{display:block;margin:12px auto 0;background:none;border:1px solid var(--line);border-radius:10px;padding:9px 18px;font:inherit;font-size:14px;font-weight:600;color:var(--accent);cursor:pointer;transition:border-color .15s,background .15s}
.more:hover{border-color:var(--accent);background:var(--accent-soft)}
.tile.in{opacity:1;transform:none}
.tile:hover{transform:translateY(-3px);border-color:var(--accent);text-decoration:none;box-shadow:0 6px 14px rgba(15,18,25,.1),0 16px 40px rgba(15,18,25,.09)}
.tile .ic{width:40px;height:40px;flex:0 0 auto;border-radius:11px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center}
.tile .ic svg{width:23px;height:23px}
.tile .tx{min-width:0}
.tile .t{font-weight:700;color:var(--ink);margin:1px 0 4px;line-height:1.25}
.tile .d{font-size:12.5px;color:var(--muted);line-height:1.4}
.tile:hover .ic{background:var(--accent);color:#fff}

/* ---------- Карточка калькулятора ---------- */
.calc-head{display:flex;align-items:center;gap:14px;margin-top:10px}
.calc-head .ic{width:46px;height:46px;border-radius:12px;background:var(--accent-soft);color:var(--accent);display:flex;align-items:center;justify-content:center;flex:0 0 auto}
.calc-head .ic svg{width:26px;height:26px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin:16px 0;animation:rise .4s ease both}
@keyframes rise{from{opacity:0;transform:translateY(12px)}to{opacity:1;transform:none}}
.form-row{display:flex;flex-wrap:wrap;gap:6px;align-items:center;padding:11px 0;border-bottom:1px solid var(--line)}
.form-row:last-of-type{border-bottom:0}
.form-row label{flex:1 1 220px;font-size:15px}
.form-row .field{flex:0 0 auto;display:flex;align-items:center;gap:8px}
.form-row input[type=number],.form-row select{width:132px;padding:9px 11px;border:1px solid var(--line);border-radius:9px;background:var(--bg);color:var(--ink);font-size:15px;transition:border-color .15s,box-shadow .15s}
.form-row input[type=number]:focus,.form-row select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.form-row select{width:auto;min-width:150px;max-width:270px}
.form-row .u{color:var(--muted);font-size:14px;min-width:34px}

/* ---------- Результаты ---------- */
.results{margin-top:18px;background:var(--accent-soft);border:1px solid var(--line);border-radius:12px;padding:6px 16px;transition:box-shadow .2s}
.results.flash{animation:flash .5s ease}
@keyframes flash{0%{box-shadow:0 0 0 0 rgba(227,155,33,.5)}100%{box-shadow:0 0 0 10px rgba(227,155,33,0)}}
.res-row{display:flex;justify-content:space-between;gap:12px;padding:9px 0;border-bottom:1px dashed rgba(120,130,140,.28);font-size:15px}
.res-row:last-child{border-bottom:0}
.res-row .rl{color:var(--muted)}
.res-row .rv{font-weight:700;color:var(--ink);white-space:nowrap;font-variant-numeric:tabular-nums}
.res-row.main{padding:12px 0}
.res-row.main .rl{color:var(--ink);font-weight:600;font-size:16px}
.res-row.main .rv{color:var(--accent);font-size:23px}

/* ---------- Методика ---------- */
.meta{margin-top:16px;font-size:14px;color:var(--muted)}
.meta .formula{background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:10px 12px;margin:8px 0;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;color:var(--ink);overflow-x:auto}
.meta .tip{border-left:3px solid var(--accent);padding:5px 0 5px 12px;margin:10px 0;color:var(--ink)}
.meta .norm{display:inline-block;background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:4px 13px;font-size:12px;margin-top:6px}
.related{margin-top:22px}
.related a{display:inline-block;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:7px 13px;margin:4px 6px 0 0;font-size:14px;transition:border-color .15s,transform .1s}
.related a:hover{border-color:var(--accent);transform:translateY(-1px)}
footer.site{border-top:1px solid var(--line);margin-top:34px;padding:22px 0;color:var(--muted);font-size:13px;text-align:center}
.disclaimer{font-size:12px;color:var(--muted);margin-top:14px;line-height:1.5}
.empty{color:var(--muted);padding:22px 0}

@media(max-width:560px){
  h1{font-size:23px}
  header.site .logo{font-size:12.5px;letter-spacing:.12em}
  .form-row label{flex:1 1 100%}
  .form-row .field{width:100%;justify-content:flex-end}
  .search{max-width:none;order:3;flex-basis:100%}
  header.site .wrap{flex-wrap:wrap;row-gap:10px}
  header.site .nav{order:4;flex-basis:100%;margin:0 -4px}
}
@media(min-width:561px) and (max-width:900px){
  header.site .wrap{flex-wrap:wrap}
  header.site .nav{order:4;flex-basis:100%;margin:0}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .tile{opacity:1;transform:none}
}