:root{
  --powder:#EBDCD3;--powder2:#F4EAE3;--paper:#FBF6F2;--emer:#1E4B43;--emer2:#163A34;--brass:#B08D57;--brass2:#D2B47F;
  --ink:#20252B;--mute:#6A6460;--line:#D9C6B9;--cut:#C9A9A0;
  --h:'Marcellus',Georgia,serif;--t:'Fira Sans',system-ui,sans-serif;
  --gut:clamp(16px,4vw,56px);--max:1240px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:70px}
body{margin:0;background:var(--powder);color:var(--ink);font:400 17px/1.6 var(--t);-webkit-font-smoothing:antialiased}
/* вертикальные стыки полос как сетка страницы */
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background:repeating-linear-gradient(90deg,transparent 0 calc(53vw/4 - 1px),rgba(176,141,87,.09) calc(53vw/4 - 1px) calc(53vw/4))}
main,footer,.ob-tape{position:relative;z-index:1}
h1,h2,h3{font-family:var(--h);font-weight:400;line-height:1.08;margin:0;letter-spacing:.01em}
h2{font-size:clamp(34px,4.4vw,56px)}
a{color:var(--emer)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--gut)}

/* ── лента-рулетка ───────────────────────────── */
.ob-tape{position:sticky;top:0;z-index:20;height:54px;
  background:linear-gradient(#D9BC86,#B89558 55%,#A27F49);box-shadow:0 2px 0 #8C6C3B,0 8px 20px rgba(32,37,43,.12);overflow:hidden}
.ob-tape__ticks{position:absolute;inset:0;pointer-events:none;
  background:
    repeating-linear-gradient(90deg,#3B2F1C 0 1px,transparent 1px 10px) 0 0/100% 9px no-repeat,
    repeating-linear-gradient(90deg,#3B2F1C 0 1px,transparent 1px 50px) 0 0/100% 15px no-repeat,
    repeating-linear-gradient(90deg,#3B2F1C 0 1px,transparent 1px 10px) 0 100%/100% 7px no-repeat}
.ob-tape__nums{position:absolute;left:0;right:0;top:15px;display:flex;font:500 10px var(--t);color:#4A3B22;pointer-events:none;white-space:nowrap}
.ob-tape__nums span{flex:0 0 100px;padding-left:3px}
.ob-tape nav{position:relative;height:100%;max-width:var(--max);margin:0 auto;display:flex;justify-content:space-between;align-items:flex-end;padding:0 var(--gut) 7px}
.ob-tape a{position:relative;font:500 14px var(--t);letter-spacing:.04em;color:var(--ink);text-decoration:none;padding:4px 14px;border-radius:3px;transition:color .25s}
.ob-tape a:hover{color:var(--emer)}
.ob-tape__home{font-family:var(--h)!important;letter-spacing:.02em!important}
.ob-tape__mark{position:absolute;bottom:3px;height:30px;background:var(--emer);border-radius:3px;transition:left .45s cubic-bezier(.2,.8,.2,1),width .45s cubic-bezier(.2,.8,.2,1);z-index:-0}
.ob-tape__mark::after{content:"";position:absolute;left:50%;bottom:-9px;margin-left:-7px;border:7px solid transparent;border-top-color:var(--emer)}
.ob-tape a.is-on{color:#fff}
.ob-tape a{z-index:1}

/* ── первый экран ───────────────────────────── */
.ob-hero{position:relative;min-height:min(640px,82vh);display:flex;align-items:center;overflow:hidden;
  background:var(--powder) url(img/hero.webp) right center/auto 100% no-repeat}
.ob-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,var(--powder) 30%,rgba(235,220,211,.85) 44%,rgba(235,220,211,0) 62%);pointer-events:none}
.ob-hero .wrap{position:relative;z-index:1;width:100%}
.ob-hero h1{font-size:clamp(42px,5.6vw,76px);max-width:640px}
.ob-hero p{max-width:470px;margin:24px 0 0;font-size:18px;color:#3C3936}
.ob-hero__rule{width:64px;height:2px;background:var(--brass);margin:30px 0 24px}
.ob-hero__feats{display:flex;gap:28px;flex-wrap:wrap;margin:0;padding:0;list-style:none;font-size:14px;line-height:1.35}
.ob-hero__feats li{display:flex;gap:10px;align-items:center;max-width:170px}
.ob-hero__feats svg{flex:0 0 34px;height:34px;stroke:var(--brass);fill:none;stroke-width:1.5}

/* ── раскрой ───────────────────────────── */
.ob-sec{padding:84px 0}
.ob-lead{color:var(--mute);margin:14px 0 0;max-width:560px}
.ob-calc{background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.ob-calc__grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:start}
.ob-form{margin-top:28px}
.ob-tabs{display:flex;border:1px solid var(--line);border-radius:6px;overflow:hidden;width:max-content;max-width:100%}
.ob-tabs button{font:500 13px var(--t);border:0;background:transparent;padding:10px 16px;cursor:pointer;color:var(--mute)}
.ob-tabs button.is-on{background:var(--emer);color:#fff}
.ob-fs{border:0;padding:0;margin:22px 0 0}
.ob-fs legend{font-weight:600;font-size:15px;margin-bottom:10px;padding:0}
.ob-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.ob-row--4{grid-template-columns:repeat(4,1fr)}
.ob-f{display:flex;flex-direction:column;gap:5px;font-size:12px;color:var(--mute)}
.ob-f input,.ob-f select{font:500 16px var(--t);color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:6px;padding:11px 12px;width:100%;min-width:0}
.ob-f input:focus,.ob-f select:focus{outline:2px solid var(--brass);outline-offset:1px}
.ob-step{display:flex;align-items:center;border:1px solid var(--line);border-radius:6px;background:#fff}
.ob-step button{flex:0 0 38px;height:42px;border:0;background:transparent;font:500 18px var(--t);color:var(--emer);cursor:pointer}
.ob-step output{flex:1;text-align:center;font:500 16px var(--t)}
.ob-chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.ob-chips button{font:500 12px var(--t);border:1px solid var(--line);background:transparent;border-radius:99px;padding:5px 11px;cursor:pointer;color:var(--mute)}
.ob-chips button:hover{border-color:var(--brass);color:var(--ink)}
.ob-match{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.ob-match label{cursor:pointer}
.ob-match input{position:absolute;opacity:0}
.ob-match span{display:flex;flex-direction:column;align-items:center;gap:8px;padding:12px 6px 10px;border:1px solid var(--line);border-radius:6px;background:#fff;font-size:12.5px;text-align:center;transition:.2s}
.ob-match i{display:block;width:52px;height:38px;border-radius:2px;background:var(--emer) var(--tile) 0 0/19px 19px;position:relative;overflow:hidden}
.ob-match i::after{content:"";position:absolute;left:50%;top:0;bottom:0;width:2px;margin-left:-1px;background:var(--brass2)}
.ob-match .m-straight i{background-position:0 0,0 0}
.ob-match input:checked+span{background:var(--brass);border-color:var(--brass);color:#fff}
.ob-match input:focus-visible+span{outline:2px solid var(--emer)}
.ob-note{font-size:12.5px;color:var(--mute);margin:10px 0 0}

.ob-scheme__head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;flex-wrap:wrap}
.ob-scheme__head h3{font-size:22px}
.ob-legend{display:flex;gap:16px;font-size:12px;color:var(--mute);flex-wrap:wrap}
.ob-legend span{display:inline-flex;gap:6px;align-items:center}
.ob-legend i{width:14px;height:14px;border:1px solid var(--line);display:inline-block}
.ob-legend .l-full{background:var(--emer) var(--tile) 0 0/7px 7px}
.ob-legend .l-cut{background:repeating-linear-gradient(45deg,var(--cut) 0 2px,transparent 2px 5px)}
.ob-legend .l-hole{background:#fff}
.ob-wall{margin-top:16px;position:relative;background:#F3E9E1;border:1px solid var(--line);border-radius:6px;padding:14px 10px 10px 30px}
.ob-wall svg{display:block;width:100%;height:auto}
.ob-wall__h{position:absolute;left:4px;top:50%;transform:translateY(-50%) rotate(-90deg);font-size:11px;color:var(--mute);white-space:nowrap}
.ob-row-l{font-family:var(--t);font-weight:500;fill:var(--mute)}
.ob-roll-n{font-family:var(--t);font-weight:600;fill:#F4EAE3;paint-order:stroke;stroke:#1E4B43;stroke-width:3px}
.ob-sum{margin-top:18px;display:grid;grid-template-columns:repeat(3,1fr) 1.2fr;gap:0;background:var(--powder2);border:1px solid var(--line);border-radius:8px;padding:18px 8px}
.ob-sum div{padding:0 14px;border-right:1px solid var(--line)}
.ob-sum div:last-child{border:0;font-size:12px;color:var(--mute);line-height:1.45}
.ob-sum b{display:block;font:400 40px/1 var(--h);color:var(--emer);font-variant-numeric:tabular-nums}
.ob-sum small{font-size:13px;color:var(--mute)}
.ob-warn{margin:12px 0 0;padding:10px 14px;border-left:3px solid #B5523B;background:#F7E3DC;font-size:14px}
.ob-warn[hidden]{display:none}
.ob-rolls{margin-top:14px;display:flex;flex-wrap:wrap;gap:6px}
.ob-roll{height:14px;border-radius:2px;background:var(--line);display:flex;overflow:hidden;flex:0 0 auto}
.ob-roll i{display:block;height:100%;background:var(--emer);border-right:1px solid var(--powder2)}
.ob-roll i.s{background:var(--brass)}

/* ── раппорт ───────────────────────────── */
.ob-rap__grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:center}
.ob-rap__trio{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.ob-pair{text-align:center}
.ob-pair h3{font:500 14px var(--t);margin-bottom:12px}
.ob-pair__win{position:relative;height:250px;display:flex;justify-content:center;gap:2px;overflow:hidden;border:1px solid var(--line);background:var(--emer)}
.ob-pair__win b{flex:0 0 50%;background:var(--emer) var(--tile) 0 0/var(--rep) var(--rep);transition:background-position 1.1s cubic-bezier(.3,.7,.2,1)}
.ob-pair__win b+b{box-shadow:-2px 0 0 var(--brass2)}
.ob-pair p{font-size:13px;margin:12px 0 0;color:var(--mute)}
.ob-pair p strong{display:block;color:var(--ink);font-size:14px}
.ob-pair p em{font-style:normal;color:var(--emer);font-weight:600}
.ob-btn{display:inline-flex;align-items:center;gap:10px;margin-top:26px;border:1px solid var(--brass);color:#7B5F33;padding:12px 22px;border-radius:4px;text-decoration:none;font-weight:500;font-size:15px;transition:.2s;background:transparent;cursor:pointer}
.ob-btn:hover{background:var(--brass);color:#fff}

/* ── стена ───────────────────────────── */
.ob-wallprep{background:var(--emer);color:#EFE6DE;padding:56px 0}
.ob-wallprep .wrap{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:40px;align-items:center}
.ob-wallprep h2{color:#fff}
.ob-wallprep p{color:#C9D3CC;font-size:15px}
.ob-wallprep .ob-btn{border-color:var(--brass2);color:var(--brass2)}
.ob-wallprep .ob-btn:hover{color:var(--emer2);background:var(--brass2)}
.ob-checks{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.ob-check{background:var(--paper);color:var(--ink);border-radius:6px;padding:20px 14px 18px;text-align:center}
.ob-check svg{width:58px;height:58px;stroke:var(--brass);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ob-check h3{font:600 14.5px var(--t);margin:10px 0 6px}
.ob-check p{margin:0;font-size:13px;color:var(--mute);line-height:1.45}

/* ── ошибки ───────────────────────────── */
.ob-err{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;margin-top:30px}
.ob-err article{background:var(--paper);border:1px solid var(--line);border-radius:6px;overflow:hidden;position:relative}
.ob-err svg{display:block;width:100%;height:130px;background:#F1E5DC}
.ob-err .n{position:absolute;left:10px;top:10px;width:34px;height:34px;border-radius:50%;background:var(--brass);color:#fff;font:400 18px/34px var(--h);text-align:center}
.ob-err h3{font:600 15px var(--t);margin:14px 14px 6px}
.ob-err p{margin:0 14px 16px;font-size:13.5px;color:var(--mute);line-height:1.5}

/* ── вопросы ───────────────────────────── */
.ob-faq .wrap{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:48px}
.ob-faq details{background:var(--paper);border:1px solid var(--line);border-radius:6px;margin-bottom:10px}
.ob-faq summary{cursor:pointer;list-style:none;padding:15px 48px 15px 18px;position:relative;font-weight:500}
.ob-faq summary::-webkit-details-marker{display:none}
.ob-faq summary::after{content:"";position:absolute;right:20px;top:50%;width:8px;height:8px;border:solid var(--brass);border-width:0 2px 2px 0;transform:translateY(-70%) rotate(45deg);transition:transform .25s}
.ob-faq details[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.ob-faq details p{margin:0;padding:0 18px 16px;color:#3C3936;font-size:15.5px}

/* ── подвал ───────────────────────────── */
.ob-foot{background:var(--emer2);color:#C9D3CC;padding:40px 0;font-size:14px;position:relative;overflow:hidden}
.ob-foot::before{content:"";position:absolute;inset:0;background:var(--tile) 0 0/120px 120px;opacity:.08}
.ob-foot .wrap{position:relative;display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:center}
.ob-foot b{display:block;font:400 26px var(--h);color:#fff}
.ob-foot nav{display:flex;gap:22px;flex-wrap:wrap}
.ob-foot a{color:#E3D6C3;text-decoration:none}
.ob-foot a:hover{color:#fff}
.ob-foot u{text-decoration:underline}

/* ── появление ───────────────────────────── */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s,transform .7s cubic-bezier(.2,.8,.2,1)}
.rv.in{opacity:1;transform:none}

@media (max-width:1080px){
  .ob-calc__grid,.ob-rap__grid,.ob-faq .wrap,.ob-wallprep .wrap{grid-template-columns:minmax(0,1fr)}
  .ob-err{grid-template-columns:repeat(3,1fr)}
  .ob-checks{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  body{font-size:16px}
  .ob-sec{padding:56px 0}
  .ob-tape{height:50px}
  .ob-tape nav{overflow-x:auto;scrollbar-width:none;justify-content:flex-start;gap:4px}
  .ob-tape nav::-webkit-scrollbar{display:none}
  .ob-tape a{font-size:13px;padding:4px 10px;white-space:nowrap}
  .ob-hero{min-height:0;display:block;background-size:auto 260px;background-position:62% 0;padding:280px 0 40px}
  .ob-hero::after{background:linear-gradient(180deg,rgba(235,220,211,0) 150px,var(--powder) 262px)}
  .ob-row--4{grid-template-columns:1fr 1fr}
  .ob-sum{grid-template-columns:repeat(3,1fr)}
  .ob-sum div:nth-child(3){border:0}
  .ob-sum div:last-child{grid-column:1/-1;padding-top:12px;margin-top:12px;border-top:1px solid var(--line)}
  .ob-sum b{font-size:32px}
  .ob-rap__trio{grid-template-columns:minmax(0,1fr);gap:18px}
  .ob-pair{display:grid;grid-template-columns:110px minmax(0,1fr);column-gap:16px;text-align:left;align-items:start}
  .ob-pair h3{grid-column:2;grid-row:1;margin:0 0 4px}
  .ob-pair__win{grid-column:1;grid-row:1/span 3;height:150px}
  .ob-pair p{grid-column:2;margin:4px 0 0}
  .ob-err{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;margin-right:calc(-1 * var(--gut));padding-right:var(--gut)}
  .ob-err article{flex:0 0 72%;scroll-snap-align:start}
  .ob-checks{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none}
  *{transition:none!important;animation:none!important}
}