/* Газгольдер39 — версия 3. Графит · жёлтый · тёплая бумага. Ценник как главный приём. */
:root{--y:#fdd909;--y2:#ffe45e;--ink:#1f1d19;--ink2:#34312b;--paper:#faf8f1;--sand:#f0ecdc;--mut:#615c50;--line:#e5e0cd;--r:22px;--pad:max(20px,calc(50% - 540px))}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:84px}
body{margin:0;font:400 17px/1.65 Onest,Inter,"Segoe UI",Arial,sans-serif;color:var(--ink);background:var(--paper);min-width:320px;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;height:auto}
/* фиксированная рамка страницы: шапка, контент и подвал не растягиваются на широких экранах */
body{background:#e4dec8}
header,main,footer{width:100%;max-width:1320px;margin-left:auto;margin-right:auto}
main{background:var(--paper);overflow:clip;box-shadow:0 0 70px rgba(31,29,25,.14)}
footer{box-shadow:0 0 70px rgba(31,29,25,.14)}
a{color:inherit;text-decoration-color:var(--y);text-decoration-thickness:2px;text-underline-offset:3px}a:hover{text-decoration-color:currentColor}
h1,h2,h3{margin:0 0 .5em;line-height:1.12;letter-spacing:-.02em;font-weight:800;text-wrap:balance}
h1{font-size:clamp(34px,5.2vw,64px)}h2{font-size:clamp(28px,3.6vw,44px)}h3{font-size:19px;letter-spacing:-.01em;font-weight:700}
p{margin:0 0 1em}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px;border-radius:6px}
.hd :focus-visible,.hero :focus-visible,.band :focus-visible,.dark :focus-visible,.foot :focus-visible{outline-color:var(--y)}
.formbox :focus-visible{outline-color:var(--ink)}

/* шапка */
.hd{position:sticky;top:0;z-index:50;background:var(--ink);color:#fff}
.hd-in{display:flex;align-items:center;gap:24px;padding:12px var(--pad)}
.logo{display:block;line-height:0;flex:none}.logo img{width:196px;height:auto}
.nav{display:flex;gap:2px;margin-left:auto}
.nav a{white-space:nowrap;color:#e9e6da;text-decoration:none;font-weight:500;font-size:15px;padding:9px 12px;border-radius:99px}
.nav a:hover{background:var(--ink2)}.nav a.on{background:var(--y);color:var(--ink)}
.tb-call{display:flex;align-items:center;gap:14px}
.tel{color:var(--y);font-weight:800;font-size:18px;text-decoration:none;white-space:nowrap}
.burger{display:none;align-items:center;gap:10px;padding:9px 14px;border:0;border-radius:99px;background:var(--ink2);color:#fff;font:600 14px Onest,Inter,sans-serif;cursor:pointer}
.burger i,.burger i:before,.burger i:after{display:block;width:16px;height:2px;background:var(--y);content:"";position:relative}
.burger i:before{position:absolute;top:-5px}.burger i:after{position:absolute;top:5px}

/* кнопки */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:2px solid var(--y);background:var(--y);color:var(--ink);font:700 16px/1.1 Onest,Inter,Arial,sans-serif;padding:16px 28px;border-radius:99px;cursor:pointer;text-decoration:none;text-align:center;transition:background .2s,border-color .2s,color .2s}
.btn:hover{background:var(--y2);border-color:var(--y2);color:var(--ink)}
.btn.sm{padding:11px 20px;font-size:14.5px}.btn.block{display:flex;width:100%}
.btn.light{background:transparent;border-color:currentColor;color:var(--ink)}.btn.light:hover{background:var(--ink);border-color:var(--ink);color:var(--y)}
.hero .btn.light,.dark .btn.light{color:#fff}.hero .btn.light:hover,.dark .btn.light:hover{background:#fff;border-color:#fff;color:var(--ink)}
.tb-call .btn{display:none;white-space:nowrap}@media(min-width:1500px){.tb-call .btn{display:inline-flex}}
.btn:disabled{opacity:.6;cursor:wait}

/* жёлтая дуга — как изгиб в брошюре */
.hero,.band{position:relative;overflow:hidden;background:var(--ink);color:#fff}
.hero:before,.band:before,.hero:after,.band:after{content:"";position:absolute;left:-6%;right:-6%;bottom:-1px;border-radius:50% 50% 0 0/100% 100% 0 0}
.hero:before,.band:before{height:76px;background:var(--y)}
.hero:after,.band:after{height:62px;background:var(--paper)}
.hero-in{position:relative;z-index:1;display:grid;grid-template-columns:1.2fr .8fr;gap:56px;align-items:center;padding:76px var(--pad) 130px}
.hero h1{color:#fff;max-width:13em}
.lead{font-size:clamp(18px,1.6vw,21px);color:#d8d4c6;max-width:33em}
.ticks{list-style:none;margin:28px 0;padding:0;display:grid;gap:12px}
.ticks li,.prose li{position:relative;padding-left:38px}
.ticks li:before,.prose li:before{content:"";position:absolute;left:0;top:.18em;width:24px;height:24px;border-radius:7px;background:var(--y) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f1d19' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center/15px no-repeat}
.hero .ticks li{color:#f1eee2}
.cta{display:flex;flex-wrap:wrap;gap:12px}

/* ценник */
.pt{display:flex;flex-direction:column;line-height:1}
.pt .n{font-weight:800;font-size:clamp(46px,5vw,66px);letter-spacing:-.035em;white-space:nowrap}
.pt .n i{font-style:normal;font-size:.3em;font-weight:600;letter-spacing:0;margin-right:.4em}
.pt .n u{text-decoration:none;font-size:.46em;margin-left:.14em;vertical-align:.42em;font-weight:700}
.pt small{margin-top:8px;font-size:14px;font-weight:500;opacity:.75}
.pt.ask .n{font-size:22px;letter-spacing:-.01em}
.tagcard{position:relative;background:var(--y);color:var(--ink);border-radius:28px;padding:36px 32px 32px;overflow:hidden}
.tagcard:before{content:"";position:absolute;right:-64px;top:-64px;width:190px;height:190px;border-radius:50%;background:conic-gradient(#fff8 25%,transparent 0 50%,#fff8 0 75%,transparent 0) 0 0/22px 22px,#ffe766}
.tagcard>*{position:relative}
.tagcard .cap{font-weight:600;margin-bottom:22px;max-width:14em}.tagcard .cap2{margin:18px 0 22px;font-size:15px}
.tagcard .btn{background:var(--ink);border-color:var(--ink);color:var(--y)}.tagcard .btn:hover{background:#000;border-color:#000;color:var(--y2)}

/* секции */
.sec{padding:88px var(--pad)}.sec.alt{background:var(--sand)}
.dark{background:var(--ink);color:#fff}.dark p{color:#d8d4c6}.dark .formbox p{color:var(--mut)}
.sec-h{max-width:44em;margin-bottom:40px}.sec-h p{color:var(--mut);font-size:19px;margin:0}
.grid{display:grid;gap:22px}.g2{grid-template-columns:repeat(2,1fr)}.g3{grid-template-columns:repeat(3,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:center}
.photo-wrap{position:relative}
.photo-wrap:before{content:"";position:absolute;left:-28px;bottom:-28px;width:46%;aspect-ratio:1;border-radius:50%;background:conic-gradient(#fff8 25%,transparent 0 50%,#fff8 0 75%,transparent 0) 0 0/22px 22px,var(--y)}
.photo{position:relative;display:block;width:100%;aspect-ratio:5/4;object-fit:cover;object-position:38% 50%;border-radius:28px}

/* витрина: карточка товара */
.prod{position:relative;display:flex;flex-direction:column;background:#fff;border-radius:var(--r);overflow:hidden;box-shadow:0 1px 0 var(--line),0 28px 48px -30px rgba(31,29,25,.35)}
.prod .tag{position:absolute;left:16px;top:16px;z-index:1;background:var(--ink);color:var(--y);font-size:13px;font-weight:600;padding:6px 13px;border-radius:99px}
.prod .art{display:block;background:var(--sand);padding:54px 18px 0;border-bottom:12px solid #d8d1b5}
.prod .art svg,.art-big svg{display:block;margin:0 auto;width:100%;max-width:380px}
.prod .in{display:flex;flex-direction:column;flex:1;padding:24px 26px 28px}
.prod h3{font-size:22px}.prod h3 a{text-decoration:none}.prod p{color:var(--mut)}
.buy{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:14px;padding-top:14px}
.prod .pt{background:var(--y);padding:11px 18px 11px 28px;clip-path:polygon(14px 0,100% 0,100% 100%,14px 100%,0 50%)}
.prod .pt .n{font-size:30px}.prod .pt .n i{font-size:.46em}.prod .pt small{font-size:12px;margin-top:5px}
.prod .pt{min-height:60px;justify-content:center}.prod .pt.ask{background:var(--sand)}.prod .pt.ask .n{font-size:16px}

/* карточки, шаги, иконки */
.box{background:#fff;border-radius:var(--r);padding:28px}.box p{color:var(--mut);margin:0}.box h3{margin-bottom:.4em}
a.box{display:block;text-decoration:none;transition:transform .2s}a.box:hover{transform:translateY(-3px)}
.ico{display:grid;place-items:center;width:56px;height:56px;margin-bottom:18px;border:2px solid var(--y);border-radius:50%}.ico svg{width:26px;height:26px}
.steps{counter-reset:s}.step{position:relative;counter-increment:s;padding-top:66px}
.step:before{content:counter(s);position:absolute;left:0;top:0;width:46px;height:46px;display:grid;place-items:center;background:var(--y);border-radius:12px;font-weight:800;font-size:21px}
.step:not(:last-child):after{content:"";position:absolute;top:22px;left:60px;right:14px;height:2px;background:#d8d1b5}
.step p{color:var(--mut);margin:0}

/* заправка */
.calc{display:grid;grid-template-columns:1.2fr 1fr;gap:22px}.calc .box{padding:30px}
.row{margin-bottom:22px}.row label{display:block;font-weight:600;margin-bottom:8px}
input[type=range]{width:100%;accent-color:var(--ink)}
.res{display:flex;flex-direction:column;gap:4px;background:var(--ink);color:#fff;border-radius:var(--r);padding:30px}
.res small{color:#bdb9aa}.res b{font-size:clamp(32px,4vw,46px);line-height:1.1;letter-spacing:-.03em;color:var(--y);margin-bottom:14px}
.res .btn{margin-top:auto;background:var(--y);border-color:var(--y);color:var(--ink)}

/* FAQ */
details{max-width:860px;border-bottom:1px solid #d8d1b5}
summary{position:relative;cursor:pointer;list-style:none;padding:22px 52px 22px 0;font-weight:700;font-size:19px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--y);font-size:21px;font-weight:600}
details[open] summary:after{content:"–"}details p{color:var(--mut);padding-bottom:22px;margin:0;max-width:46em}

/* формы */
.formbox{position:relative;background:#fff;color:var(--ink);border-radius:var(--r);padding:32px}.formbox h3{font-size:24px}
.field{margin-bottom:14px}.field label{display:block;font-weight:600;font-size:14px;margin-bottom:6px}
input,textarea{width:100%;font:inherit;color:var(--ink);padding:14px 16px;border:1.5px solid var(--line);border-radius:14px;background:#fff}
input:focus,textarea:focus{border-color:var(--ink);outline:0;box-shadow:0 0 0 4px #fdd90966}
textarea{min-height:92px;resize:vertical}.hp{position:absolute;left:-9999px}
.msg{margin-top:12px;font-size:15px}.msg.ok{color:#2c6b34}.msg.err{color:#b3261e}.note{font-size:13px;color:var(--mut);margin:12px 0 0}
.contact{display:grid;grid-template-columns:1fr 440px;gap:64px;align-items:start}
.facts{display:grid;gap:20px;margin:28px 0 0}.facts dt{font-size:14px;color:#bdb9aa}.facts dd{margin:2px 0 0;font-weight:600}
.light .facts dt{color:var(--mut)}.facts a{text-decoration-color:var(--y)}

/* внутренние страницы */
.band{padding:40px var(--pad) 110px}
.crumbs{font-size:14px;color:#bdb9aa;margin-bottom:26px}.crumbs a{text-decoration:none}.crumbs a:hover{color:var(--y)}
.page-h h1{font-size:clamp(32px,4.4vw,54px);max-width:17em}.page-h p{color:#d8d4c6;font-size:19px;max-width:42em;margin:0}
.light{background:var(--paper)}
.two{display:grid;grid-template-columns:1fr 360px;gap:56px;align-items:start;padding:56px var(--pad) 88px}
.prose h2{font-size:28px;margin-top:1.7em}.prose h2:first-child{margin-top:0}.prose ul{list-style:none;padding:0;margin:0 0 1.2em;display:grid;gap:12px}
.prose p{max-width:44em}.prose p a,.prose li a{font-weight:600}
.art-big{background:var(--sand);border-bottom:12px solid #d8d1b5;border-radius:var(--r) var(--r) 0 0;padding:44px 20px 0;margin-bottom:36px}
.side{position:sticky;top:92px;background:#fff;border-radius:var(--r);padding:28px;box-shadow:0 1px 0 var(--line),0 28px 48px -30px rgba(31,29,25,.35)}
.side .big{margin:-28px -28px 22px;padding:22px 28px;background:var(--y);border-radius:var(--r) var(--r) 0 0;font-size:32px;font-weight:800;line-height:1.1;letter-spacing:-.02em}.side .big small{display:block;font-size:14px;font-weight:500;letter-spacing:0;margin-bottom:6px}
.side ul{margin:0 0 22px;padding:0;list-style:none;display:grid;gap:8px;color:var(--mut);font-size:15px}.side h3{font-size:22px}
.spec{width:100%;border-collapse:collapse;margin:26px 0}.spec td{padding:13px 0;border-bottom:1px solid var(--line)}.spec td:first-child{width:38%;color:var(--mut)}
.req{margin:0;font-size:15px;line-height:1.9}

/* подвал */
.foot{background:var(--ink);color:#bdb9aa;padding:64px var(--pad) 36px;font-size:15px;border-top:1px solid var(--ink2)}
.cols{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:44px}
.foot b{display:block;color:#fff;margin-bottom:12px;font-size:16px}.foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.foot a{text-decoration:none}.foot a:hover{color:var(--y)}
.copy{margin-top:44px;padding-top:22px;border-top:1px solid var(--ink2);font-size:13px;color:#8f8b7d}
.btn.fab{display:none}
dialog{border:0;border-radius:var(--r);padding:0;max-width:440px;width:calc(100% - 32px);background:transparent;overflow:visible}dialog::backdrop{background:rgba(31,29,25,.7)}
dialog .formbox{border-top:8px solid var(--y)}
dialog .x{position:absolute;right:14px;top:18px;width:36px;height:36px;border:0;border-radius:50%;background:var(--ink);color:var(--y);font-size:20px;cursor:pointer}

@media(max-width:1130px){
 .nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;gap:2px;background:var(--ink);padding:8px var(--pad) 22px;border-top:1px solid var(--ink2)}.nav.open{display:flex;box-shadow:0 30px 40px -10px rgba(0,0,0,.45)}
 .nav a{font-size:17px;padding:13px 14px}.burger{display:inline-flex}.tb-call{margin-left:auto}.tb-call .btn{display:none!important}}
@media(max-width:900px){
 .hero-in,.split,.contact,.calc,.two{grid-template-columns:1fr}.hero-in{gap:40px;padding:52px var(--pad) 118px}.split{gap:44px}.contact{gap:40px}
 .g3,.g2{grid-template-columns:1fr}.g4{grid-template-columns:repeat(2,1fr)}.step:after{display:none}
 .two{grid-template-columns:1fr!important}.side{position:static}.cols{grid-template-columns:1fr;gap:30px}.sec{padding:64px var(--pad)}.two{padding:40px var(--pad) 64px;gap:40px}.band{padding:30px var(--pad) 100px}}
@media(max-width:600px){
 .logo img{width:176px}.tb-call{display:none}.burger{margin-left:auto}.hd-in{gap:12px}.g4{grid-template-columns:1fr}.formbox{padding:24px}.btn{padding:15px 22px}
 .hero:before,.band:before{height:52px}.hero:after,.band:after{height:42px}
 body{padding-bottom:78px}
 .btn.fab{display:flex;position:fixed;left:12px;right:12px;bottom:12px;z-index:40;box-shadow:0 12px 28px rgba(31,29,25,.45)}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn,a.box{transition:none}a.box:hover{transform:none}}