/* Мягкие резервуары · Тент-Опт — стили лендинга
   Направление: индустриальный премиум. Графит + тёплый бумажный фон,
   единственный акцент — «топливный» янтарь. Golos для текста, Plex Mono
   для спецификаций и служебных подписей. */

@font-face{font-family:"Golos Text";font-style:normal;font-weight:400 700;font-display:swap;src:url("../fonts/golos-text-var-cyrillic-ext.woff2") format("woff2");unicode-range:U+0460-052F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}
@font-face{font-family:"Golos Text";font-style:normal;font-weight:400 700;font-display:swap;src:url("../fonts/golos-text-var-cyrillic.woff2") format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"Golos Text";font-style:normal;font-weight:400 700;font-display:swap;src:url("../fonts/golos-text-var-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:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/ibm-plex-mono-400-cyrillic-ext.woff2") format("woff2");unicode-range:U+0460-052F,U+1C80-1C88,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/ibm-plex-mono-400-cyrillic.woff2") format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:400;font-display:swap;src:url("../fonts/ibm-plex-mono-400-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:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url("../fonts/ibm-plex-mono-500-cyrillic-ext.woff2") format("woff2");unicode-range:U+0460-052F,U+1C80-1C88,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url("../fonts/ibm-plex-mono-500-cyrillic.woff2") format("woff2");unicode-range:U+0301,U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:"IBM Plex Mono";font-style:normal;font-weight:500;font-display:swap;src:url("../fonts/ibm-plex-mono-500-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{
  --ink:#0C0F14; --ink-2:#141A22; --ink-3:#1C232D;
  --paper:#F4F1EA; --paper-2:#EAE5DA; --white:#FFFDF8;
  --text:#161A20; --text-2:#5C6470;
  --on-ink:#EEF1F5; --on-ink-2:#9AA3AE;
  --line:rgba(12,15,20,.12); --line-ink:rgba(238,241,245,.1);
  --amber:#F5B301; --amber-2:#D99C00; --amber-ink:#3A2C00;
  --ok:#3FBF7F; --err:#E5484D;
  --font:"Golos Text",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
  --r:14px; --r-lg:22px;
  --wrap:1200px;
  --sh:0 24px 60px -24px rgba(12,15,20,.45);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}
body{margin:0;font:400 17px/1.55 var(--font);color:var(--text);background:var(--paper);-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:inherit}
button{font:inherit;color:inherit}
h1,h2,h3{margin:0;line-height:1.1;letter-spacing:-.02em;font-weight:700}
p{margin:0}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(16px,4vw,32px)}
.mono{font-family:var(--mono);font-weight:500;letter-spacing:.02em}
.muted{color:var(--text-2)}
.sec--ink .muted{color:var(--on-ink-2)}
.center{text-align:center;max-width:760px;margin:28px auto 0}
.tiny{font-size:13px;margin-top:10px}
.skip{position:absolute;left:-999px;top:8px;background:var(--amber);color:var(--amber-ink);padding:8px 12px;border-radius:8px;z-index:100}
.skip:focus{left:8px}

.h1{font-size:clamp(38px,5.6vw,68px);color:var(--on-ink)}
.h1__accent{color:var(--amber)}
.h2{font-size:clamp(30px,4vw,48px)}
.h2 em{font-style:normal;color:var(--amber-2)}
.sec--ink .h2 em{color:var(--amber)}
.h3{font-size:clamp(22px,2.4vw,28px)}
.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.14em;color:var(--amber-2);margin-bottom:14px}
.sec--ink .eyebrow,.hero .eyebrow{color:var(--amber)}
.lead{font-size:clamp(17px,1.5vw,20px);line-height:1.5;color:var(--text-2);max-width:62ch}
.hero .lead,.sec--ink .lead{color:var(--on-ink-2)}

/* ---------- кнопки ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:14px 22px;border-radius:12px;border:1px solid transparent;font-weight:600;font-size:16px;line-height:1;text-decoration:none;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s,border-color .15s;white-space:nowrap}
.btn:active{transform:translateY(1px)}
.btn:focus-visible,.opt:focus-visible,.lnk:focus-visible,.input:focus-visible,summary:focus-visible{outline:3px solid var(--amber);outline-offset:2px}
.btn--cta{background:var(--amber);color:var(--amber-ink);box-shadow:0 10px 26px -12px rgba(245,179,1,.8)}
.btn--cta:hover{background:#FFC42A;box-shadow:0 14px 32px -12px rgba(245,179,1,.9)}
.btn--ghost{background:transparent;border-color:var(--line);color:inherit}
.sec--ink .btn--ghost,.hero .btn--ghost,.sticky .btn--ghost{border-color:var(--line-ink);color:var(--on-ink)}
.btn--ghost:hover{border-color:currentColor}
.btn--sm{padding:11px 16px;font-size:14px}
.btn--lg{padding:18px 28px;font-size:17px}
.btn--block{width:100%}
.btn[disabled]{opacity:.55;cursor:not-allowed;box-shadow:none}
.lnk{background:none;border:0;padding:0;color:var(--amber);text-decoration:underline;text-underline-offset:3px;cursor:pointer}

/* ---------- шапка ---------- */
.hdr{position:sticky;top:0;z-index:40;background:rgba(12,15,20,.86);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line-ink);color:var(--on-ink)}
.hdr__in{display:flex;align-items:center;gap:28px;min-height:70px}
.logo{display:flex;align-items:center;gap:12px;text-decoration:none}
.logo__mark{width:38px;height:38px;flex:none}
.logo__t{display:flex;flex-direction:column;line-height:1.1}
.logo__t b{font-size:17px;letter-spacing:-.01em}
.logo__t small{font-size:12px;color:var(--on-ink-2)}
.ftr .logo__t small{color:var(--text-2)}
.nav{display:flex;gap:22px;margin-left:auto}
.nav a{text-decoration:none;font-size:15px;color:var(--on-ink-2);transition:color .15s}
.nav a:hover{color:var(--on-ink)}
.hdr__cta{display:flex;align-items:center;gap:18px}
.callcta{display:flex;flex-direction:column;text-decoration:none;line-height:1.15}
.callcta__num{font-weight:700;font-size:16px;letter-spacing:-.01em}
.callcta small{font-size:11px;color:var(--on-ink-2)}
.ftr .callcta small{color:var(--text-2)}

/* ---------- hero ---------- */
.hero{position:relative;background:var(--ink);color:var(--on-ink);overflow:hidden;padding:clamp(40px,6vw,88px) 0 clamp(48px,6vw,96px)}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 520px at 22% 0%,rgba(245,179,1,.14),transparent 60%),radial-gradient(600px 400px at 90% 100%,rgba(56,182,201,.08),transparent 60%);pointer-events:none}
.hero__grid{position:absolute;inset:0;background-image:linear-gradient(var(--line-ink) 1px,transparent 1px),linear-gradient(90deg,var(--line-ink) 1px,transparent 1px);background-size:64px 64px;mask-image:radial-gradient(70% 70% at 50% 40%,#000 30%,transparent 100%);-webkit-mask-image:radial-gradient(70% 70% at 50% 40%,#000 30%,transparent 100%);opacity:.6;pointer-events:none}
.hero__in{position:relative;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(360px,440px);gap:clamp(28px,4vw,56px);align-items:start}
.hero__copy>*{animation:rise .7s cubic-bezier(.2,.7,.2,1) both}
.hero__copy>:nth-child(2){animation-delay:.08s}.hero__copy>:nth-child(3){animation-delay:.16s}.hero__copy>:nth-child(4){animation-delay:.24s}.hero__copy>:nth-child(5){animation-delay:.34s}
.hero__form{animation:rise .8s .3s cubic-bezier(.2,.7,.2,1) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.hero .lead{margin-top:20px}
.proof{list-style:none;padding:0;margin:28px 0 0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.proof li{border:1px solid var(--line-ink);border-radius:var(--r);padding:14px 16px;background:rgba(255,255,255,.03)}
.proof b{display:block;font-size:22px;letter-spacing:-.02em;color:var(--amber);font-family:var(--mono);font-weight:500}
.proof span{display:block;font-size:13px;color:var(--on-ink-2);margin-top:4px}

.hero__photo{margin:36px 0 0;position:relative;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line-ink);box-shadow:var(--sh)}
.hero__photo img{width:100%;height:auto;aspect-ratio:1672/941;object-fit:cover;display:block}
.hero__photo figcaption{position:absolute;left:0;right:0;bottom:0;display:flex;justify-content:space-between;gap:12px;padding:14px 18px;font-size:12px;color:var(--on-ink);background:linear-gradient(to top,rgba(12,15,20,.85),transparent)}
.tank{margin:0 0 28px;position:relative}
.scheme{max-width:820px;margin:0 auto 32px}
.tank__svg{width:100%;height:auto;overflow:visible}
.tank__cap{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:var(--on-ink-2);margin-top:6px;flex-wrap:wrap}
.tank__lvl b{color:var(--amber)}
.tank__wave{animation:wave 6s linear infinite}
@keyframes wave{to{transform:translateX(180px)}}
.callout__i{opacity:0;animation:fade .6s var(--d,0s) ease-out both}
@keyframes fade{to{opacity:1}}

/* ---------- карточки и формы ---------- */
.card{background:var(--white);color:var(--text);border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(20px,2.4vw,30px);box-shadow:var(--sh)}
.sec--ink .card,.hero .card{background:var(--ink-2);color:var(--on-ink);border-color:var(--line-ink)}
/* форма — flex-колонка: блок RKN:FORM (галочка рекламы) дописывается в конец формы, порядком ставим его перед кнопкой */
.leadform{display:flex;flex-direction:column}
.leadform>.btn{order:10}
.leadform>.formstate,.leadform>.tiny{order:11}
.leadform .ts-form-ads{margin-bottom:14px!important}
.leadform .h3{margin:4px 0 8px}
.leadform .muted{font-size:15px;margin-bottom:18px}
.hero .leadform .muted{color:var(--on-ink-2)}
.leadform__row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field{margin-bottom:12px;min-width:0}
.field__l{display:block;font-size:12px;color:var(--text-2);margin-bottom:6px;letter-spacing:.02em;text-transform:uppercase;font-family:var(--mono)}
.sec--ink .field__l,.hero .field__l{color:var(--on-ink-2)}
.req{color:var(--amber)}
.input{width:100%;padding:13px 14px;border-radius:10px;border:1px solid var(--line);background:var(--paper);color:inherit;font:inherit;font-size:16px;transition:border-color .15s,box-shadow .15s;appearance:none}
.sec--ink .input,.hero .input{background:rgba(255,255,255,.05);border-color:var(--line-ink);color:var(--on-ink)}
.input::placeholder{color:#8B929C}
.input:focus{border-color:var(--amber);box-shadow:0 0 0 3px rgba(245,179,1,.22);outline:none}
.input[aria-invalid="true"]{border-color:var(--err)}
.input--area{resize:vertical;min-height:64px}
select.input{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%238B929C' stroke-width='1.6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;padding-right:36px}
select.input option{color:#161A20}
.field__err{font-size:13px;color:var(--err);margin-top:6px}
.checkline{display:flex;gap:10px;align-items:flex-start;font-size:13px;line-height:1.45;margin:6px 0 16px;cursor:pointer;color:var(--text-2)}
.sec--ink .checkline,.hero .checkline{color:var(--on-ink-2)}
.checkline input{margin:3px 0 0;width:16px;height:16px;flex:none;accent-color:var(--amber)}
.checkline a{color:inherit}
.formstate{margin-top:12px;font-size:14px;padding:10px 12px;border-radius:10px}
.formstate--err{background:rgba(229,72,77,.12);color:#ff8a8e}
.formstate--ok{background:rgba(63,191,127,.14);color:var(--ok)}
.sec--paper .formstate--err{color:#B3282C}
.sec--paper .formstate--ok{color:#1F7F4E}

/* ---------- бегущая строка ---------- */
.ticker{background:var(--amber);color:var(--amber-ink);overflow:hidden;border-top:1px solid rgba(0,0,0,.1)}
.ticker__track{display:flex;gap:0;width:max-content;animation:ticker 40s linear infinite;font-family:var(--mono);font-weight:500;font-size:13px;text-transform:uppercase;letter-spacing:.08em}
.ticker__track span{padding:12px 28px;position:relative;white-space:nowrap}
.ticker__track span::after{content:"";position:absolute;right:0;top:50%;width:5px;height:5px;border-radius:50%;background:currentColor;transform:translate(50%,-50%);opacity:.5}
@keyframes ticker{to{transform:translateX(-50%)}}

/* ---------- секции ---------- */
.sec{padding:clamp(56px,8vw,112px) 0}
.sec--paper{background:var(--paper)}
.sec--ink{background:var(--ink);color:var(--on-ink)}
.sec__head{max-width:820px;margin-bottom:clamp(28px,4vw,48px)}
.sec__head .lead{margin-top:16px}
.sec__head--row{max-width:none;display:grid;grid-template-columns:1fr 1fr;gap:32px;align-items:end}
.sec__head--row .lead{margin:0}

/* применение */
.apps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.app{display:flex;flex-direction:column;gap:12px;padding:26px 24px 22px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--white);text-decoration:none;position:relative;overflow:hidden;transition:transform .2s,box-shadow .2s,border-color .2s}
.app::after{content:"";position:absolute;inset:auto -40px -40px auto;width:140px;height:140px;border-radius:50%;background:radial-gradient(circle,rgba(245,179,1,.22),transparent 70%);opacity:0;transition:opacity .25s}
.app:hover{transform:translateY(-3px);box-shadow:var(--sh);border-color:rgba(217,156,0,.5)}
.app:hover::after{opacity:1}
.app__img{flex:none;width:calc(100% + 48px);max-width:none;height:auto;aspect-ratio:4/3;margin:-26px -24px 4px;object-fit:cover;border-radius:var(--r-lg) var(--r-lg) 0 0;background:var(--paper-2);transition:transform .4s}
.app:hover .app__img{transform:scale(1.02)}
.app__ico{width:34px;height:34px;color:var(--amber-2)}
.app h3{font-size:20px}
.app p{color:var(--text-2);font-size:15px;flex:1}
.app__go{font-family:var(--mono);font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--amber-2)}
.app__go::after{content:" →"}

/* таблица моделей */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line-ink);border-radius:var(--r-lg);background:var(--ink-2)}
.tbl{width:100%;border-collapse:collapse;font-size:14px;min-width:720px}
.tbl th,.tbl td{padding:16px 18px;text-align:left;border-bottom:1px solid var(--line-ink);white-space:nowrap}
.tbl th{font-weight:500;color:var(--on-ink-2);font-size:11px;text-transform:uppercase;letter-spacing:.1em}
.tbl tbody tr:last-child td{border-bottom:0}
.tbl tbody tr{transition:background .15s}
.tbl tbody tr:hover{background:rgba(245,179,1,.06)}
.tbl td:first-child{color:var(--amber);font-weight:500}
.note-row{display:flex;gap:24px;align-items:center;justify-content:space-between;margin-top:24px;flex-wrap:wrap}
.note-row p{max-width:70ch}

/* конструкция */
.konstr{display:grid;grid-template-columns:1.1fr .9fr;gap:clamp(28px,5vw,72px);align-items:center}
.spec{margin:32px 0 0;display:grid;gap:0}
.spec div{display:grid;grid-template-columns:200px 1fr;gap:16px;padding:14px 0;border-top:1px solid var(--line)}
.spec dt{font-family:var(--mono);font-weight:500;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--text-2);margin:0;padding-top:3px}
.spec dd{margin:0;font-size:15.5px}
.layers__svg{width:100%;height:auto}
.layers figcaption{font-size:12px;color:var(--text-2);margin-top:8px;text-align:center}
.layer{animation:rise .8s var(--d) both}

/* сравнение */
.cmp{border:1px solid var(--line-ink);border-radius:var(--r-lg);overflow:hidden;background:var(--ink-2)}
.cmp__row{display:grid;grid-template-columns:1fr 1.3fr 1.3fr;border-top:1px solid var(--line-ink)}
.cmp__row>div{padding:18px 20px;font-size:15px}
.cmp__row>div:first-child{color:var(--on-ink-2);font-family:var(--mono);font-size:13px;font-weight:500}
.cmp__row--h{border-top:0;background:rgba(255,255,255,.03)}
.cmp__row--h>div{font-family:var(--mono);font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--on-ink-2)}
.cmp__row--h>div:nth-child(2){color:var(--amber)}
.cmp-photo{margin:24px 0 0;display:grid;grid-template-columns:1.1fr .9fr;gap:24px;align-items:center;padding:16px}
.cmp-photo img{width:100%;height:auto;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r)}
.cmp-photo figcaption{font-size:16px;line-height:1.55;color:var(--on-ink-2);padding:8px 12px 8px 0}
.cmp-photo b{color:var(--on-ink);display:block;margin-bottom:8px;font-size:20px;letter-spacing:-.01em}
.cmp .ok{color:var(--on-ink);position:relative;padding-left:40px}
.cmp .ok::before{content:"";position:absolute;left:20px;top:25px;width:8px;height:8px;border-radius:50%;background:var(--amber);box-shadow:0 0 0 4px rgba(245,179,1,.18)}
.cmp__row>div:last-child{color:var(--on-ink-2)}

/* процесс */
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;counter-reset:s}
.steps li{position:relative;padding:24px 22px 22px;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--white)}
.steps__n{display:inline-block;font-size:12px;color:var(--amber-2);letter-spacing:.1em;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--amber);width:100%}
.steps h3{font-size:19px;margin-bottom:8px}
.steps p{font-size:15px;color:var(--text-2)}
.cta-band{margin-top:40px;display:grid;grid-template-columns:1.2fr auto;gap:24px;align-items:center;background:var(--ink);color:var(--on-ink);border-color:var(--ink)}
.cta-band .muted{color:var(--on-ink-2);margin-top:8px}
.cta-band__act{display:flex;gap:12px;flex-wrap:wrap}
.cta-band .btn--ghost{border-color:var(--line-ink);color:var(--on-ink)}

/* квиз */
.quizwrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:clamp(28px,5vw,72px);align-items:start}
.quiz__head{display:flex;justify-content:space-between;font-size:12px;color:var(--on-ink-2)}
.quiz__head b{color:var(--amber)}
.quiz__bar{height:4px;background:rgba(255,255,255,.08);border-radius:4px;margin:10px 0 24px;overflow:hidden}
.quiz__bar span{display:block;height:100%;width:20%;background:var(--amber);transition:width .3s}
.quiz__pane{display:none;border:0;padding:0;margin:0;min-width:0}
.quiz__pane.is-active{display:block;animation:rise .35s both}
.quiz__q{font-size:clamp(20px,2vw,24px);font-weight:700;letter-spacing:-.01em;padding:0;margin-bottom:18px}
.quiz__opts{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:8px}
.opt{text-align:left;padding:14px 16px;border-radius:12px;border:1px solid var(--line-ink);background:rgba(255,255,255,.03);cursor:pointer;font-size:15px;transition:border-color .15s,background .15s;position:relative;padding-right:40px}
.opt::after{content:"";position:absolute;right:14px;top:50%;width:16px;height:16px;border-radius:50%;border:1.5px solid var(--on-ink-2);transform:translateY(-50%);transition:all .15s}
.opt:hover{border-color:rgba(245,179,1,.5)}
.opt.is-on{border-color:var(--amber);background:rgba(245,179,1,.1)}
.opt.is-on::after{border-color:var(--amber);background:var(--amber);box-shadow:inset 0 0 0 3px var(--ink-2)}
.quiz__nav{display:flex;justify-content:space-between;gap:12px;margin-top:16px}
.quiz__nav .btn--cta{margin-left:auto}

/* faq */
.faq__list{max-width:860px}
.faq__i{border-top:1px solid var(--line)}
.faq__i:last-child{border-bottom:1px solid var(--line)}
.faq__i summary{cursor:pointer;list-style:none;padding:20px 44px 20px 0;font-weight:600;font-size:18px;position:relative;letter-spacing:-.01em}
.faq__i summary::-webkit-details-marker{display:none}
.faq__i summary::after{content:"+";position:absolute;right:4px;top:16px;font-size:26px;font-weight:300;color:var(--amber-2);transition:transform .2s}
.faq__i[open] summary::after{transform:rotate(45deg)}
.faq__i p{padding:0 0 22px;color:var(--text-2);max-width:70ch}

/* футер */
.ftr{background:var(--paper-2);padding:48px 0 32px;border-top:1px solid var(--line)}
.ftr__in{display:grid;grid-template-columns:1.2fr 1fr auto;gap:32px;align-items:start}
.ftr__brand .muted{margin-top:12px;font-size:14px;max-width:40ch}
.ftr__contacts{display:flex;flex-direction:column;gap:8px;font-size:15px}
.ftr__contacts .callcta__num{font-size:20px}

/* мобильная панель */
.sticky{display:none;position:fixed;left:0;right:0;bottom:0;z-index:35;padding:10px 12px calc(10px + env(safe-area-inset-bottom));background:rgba(12,15,20,.92);backdrop-filter:blur(12px);border-top:1px solid var(--line-ink);grid-template-columns:1fr 1.6fr;gap:10px}
.sticky .btn{width:100%}

/* модалки */
.modal{position:fixed;inset:0;z-index:60;display:flex;align-items:center;justify-content:center;padding:16px}
.modal[hidden]{display:none}
.modal__bg{position:absolute;inset:0;background:rgba(12,15,20,.7);backdrop-filter:blur(4px)}
.modal__box{position:relative;width:min(460px,100%);max-height:calc(100vh - 32px);overflow:auto;animation:rise .3s both}
.modal__x{position:absolute;right:12px;top:10px;width:36px;height:36px;border:0;background:transparent;font-size:26px;line-height:1;cursor:pointer;color:var(--text-2);border-radius:8px}
.modal__x:hover{background:var(--paper)}

/* служебные страницы */
.page-min{background:var(--ink);color:var(--on-ink);min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.minpage{max-width:560px;text-align:center}
.minpage h1{font-size:clamp(30px,5vw,44px);margin-bottom:16px}
.minpage .lead{margin:0 auto 28px;color:var(--on-ink-2)}

/* ---------- адаптив ---------- */
@media(max-width:1080px){
  .hero__in{grid-template-columns:1fr}
  .hero__form{max-width:560px}
  .apps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr))}
  .konstr,.quizwrap,.sec__head--row{grid-template-columns:1fr}
  .nav{display:none}
}
@media(max-width:760px){
  body{font-size:16px}
  .hdr__cta .btn,.hdr__cta .callcta small{display:none}
  .hdr__in{gap:12px;min-height:60px}
  .hdr__cta{margin-left:auto}
  .proof{grid-template-columns:1fr;gap:8px}
  .proof li{display:flex;align-items:baseline;gap:12px;padding:10px 14px}
  .proof b{font-size:17px;white-space:nowrap;flex:none}
  .proof span{margin:0}
  .apps,.steps{grid-template-columns:1fr}
  .leadform__row{grid-template-columns:1fr;gap:0}
  .quiz__opts{grid-template-columns:1fr}
  .spec div{grid-template-columns:1fr;gap:4px}
  .cmp__row{grid-template-columns:1fr}
  .cmp__row>div{padding:12px 16px}
  .cmp__row--h>div:not(:first-child),.cmp__row>div:first-child{padding-bottom:4px}
  .cmp__row>div:last-child{padding-top:4px;padding-bottom:16px}
  .cmp__row--h{display:none}
  .cmp .ok{padding-top:28px}
  .cmp .ok::before{top:33px}
  .cmp .ok::after{content:"мягкий";position:absolute;left:40px;top:10px;font-family:var(--mono);font-size:10px;text-transform:uppercase;letter-spacing:.1em;color:var(--amber)}
  .cmp__row>div:last-child{position:relative;padding:28px 16px 16px 40px}
  .cmp__row>div:last-child::before{content:"стальной";position:absolute;left:40px;top:10px;font-family:var(--mono);font-size:10px;text-transform:uppercase;letter-spacing:.1em}
  .cta-band,.cmp-photo{grid-template-columns:1fr}
  .hero__photo figcaption{font-size:11px;padding:10px 12px}
  .ftr__in{grid-template-columns:1fr}
  .sticky{display:grid}
  body{padding-bottom:72px}
  .tank__cap{font-size:11px}
  .callout text{font-size:13px}
}

/* ===== SEO-страницы (20261009) ===== */
.hero--page{padding:clamp(28px,4vw,56px) 0 clamp(36px,5vw,64px)}
.h1--page{font-size:clamp(30px,4.2vw,52px)}
.hero--hub .hero__copy{max-width:760px}
.hero__in--one{grid-template-columns:1fr}
.hub__cta{margin-top:24px}
.crumbs ol{list-style:none;margin:0 0 18px;padding:0;display:flex;flex-wrap:wrap;gap:4px 8px;font-size:13px;color:var(--on-ink-2)}
.crumbs li+li::before{content:"/";margin-right:8px;opacity:.5}
.crumbs a{text-decoration:none;border-bottom:1px solid transparent}
.crumbs a:hover{border-color:var(--amber);color:var(--on-ink)}
.crumbs [aria-current]{color:var(--on-ink)}
.artmeta{font-size:12px;color:var(--on-ink-2);margin:12px 0 0}
.sec--tight{padding:clamp(36px,5vw,64px) 0}
.pagebody{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:clamp(28px,4vw,56px);align-items:start}
.prose{max-width:74ch;font-size:18px;line-height:1.65;color:#262C34}
.prose h2{font-size:clamp(24px,2.6vw,32px);margin:2.2em 0 .6em;color:var(--text)}
.prose h2:first-of-type{margin-top:1.2em}
.prose p{margin:0 0 1.1em}
.prose ul{margin:0 0 1.2em;padding-left:1.2em}
.prose li{margin:.35em 0}
.prose li::marker{color:var(--amber-2)}
.prose__fig{margin:0 0 8px}
.prose__fig img{width:100%;height:auto;border-radius:var(--r-lg);aspect-ratio:4/3;object-fit:cover;max-height:420px}
.ptbl-wrap{overflow-x:auto;margin:0 0 1.4em;border:1px solid var(--line);border-radius:var(--r);background:var(--white)}
.ptbl{width:100%;border-collapse:collapse;font-size:15px;min-width:520px}
.ptbl th,.ptbl td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);vertical-align:top}
.ptbl th{background:var(--paper-2);font-weight:600;font-size:13px;text-transform:uppercase;letter-spacing:.06em}
.ptbl tr:last-child td{border-bottom:0}
.inline-cta{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;margin:2em 0;padding:20px 22px;background:var(--ink);color:var(--on-ink);border-radius:var(--r-lg)}
.inline-cta b{font-size:18px;flex:1 1 260px}
.inline-cta span{flex:1 1 100%;order:3;color:var(--on-ink-2);font-size:14px;margin-top:-6px}
.side{position:sticky;top:96px;display:flex;flex-direction:column;gap:16px}
.side__box{background:var(--white);border:1px solid var(--line);border-radius:var(--r-lg);padding:18px 18px 12px}
.side__box>b{display:block;font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--amber-2);margin-bottom:10px}
.side__box a{display:block;padding:8px 0;border-top:1px solid var(--line);font-size:15px;text-decoration:none}
.side__box a:hover{color:var(--amber-2)}
.side__box--cta{background:var(--ink);color:var(--on-ink);border-color:var(--ink);padding-bottom:18px}
.side__box--cta b{font-size:18px;text-transform:none;letter-spacing:-.01em;color:var(--on-ink);font-family:var(--font)}
.side__box--cta p{font-size:14px;color:var(--on-ink-2);margin:0 0 14px}
.ctaband{display:grid;grid-template-columns:1fr auto;gap:28px;align-items:center}
.ctaband .h2{font-size:clamp(26px,3.2vw,40px)}
.ctaband__act{display:flex;flex-direction:column;gap:14px;align-items:flex-start}
.relh{margin:0 0 18px}
.relh:not(:first-child){margin-top:40px}
.rel{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.relc{display:flex;flex-direction:column;gap:8px;padding:16px 18px;background:var(--white);border:1px solid var(--line);border-radius:var(--r);text-decoration:none;transition:border-color .15s,transform .15s}
.relc:hover{border-color:var(--amber-2);transform:translateY(-2px)}
.relc__t{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--amber-2)}
.relc b{font-size:16px;line-height:1.25;letter-spacing:-.01em}
.ftr__map{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line);font-size:14px}
.ftr__map b{display:block;margin-bottom:8px;font-size:12px;text-transform:uppercase;letter-spacing:.1em;color:var(--text-2)}
.ftr__map a{display:block;padding:3px 0;text-decoration:none;color:var(--text)}
.ftr__map a:hover{color:var(--amber-2)}
@media(max-width:980px){.pagebody{grid-template-columns:minmax(0,1fr)}.side{position:static}.ctaband{grid-template-columns:1fr}.ftr__map{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.prose{font-size:17px}.ftr__map{grid-template-columns:1fr}}
.hero--page .proof{grid-template-columns:repeat(auto-fit,minmax(150px,1fr));margin-top:22px}
.hero--page .proof b{font-size:clamp(15px,1.45vw,19px);line-height:1.25;overflow-wrap:anywhere}
@media(max-width:760px){.hero--page .proof{grid-template-columns:1fr}.hero--page .proof li{display:block}.hero--page .proof b{white-space:normal}}
.prose,.side{min-width:0}.prose img{max-width:100%}