/* ДиС — Дерево и Стиль */
:root{
  --bg:#F6F1E7;
  --bg-alt:#EDE5D5;
  --ink:#26201A;
  --ink-soft:#6B6055;
  --oak:#B08350;
  --oak-deep:#8A6237;
  --graphite:#211D17;
  --gold:#C2A05C;
  --gold-line:rgba(194,160,92,.35);
  --wrap:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  font-size:17px;line-height:1.65;
  color:var(--ink);background:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3{font-family:'Prata',Georgia,serif;font-weight:400;line-height:1.12}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* grain */
.grain{position:fixed;inset:0;width:100%;height:100%;z-index:9999;pointer-events:none;opacity:.04;mix-blend-mode:multiply}

/* eyebrow / titles */
.eyebrow{font-size:12.5px;font-weight:500;text-transform:uppercase;letter-spacing:.14em;color:var(--oak)}
.section-title{font-size:clamp(30px,4.4vw,50px);margin:14px 0 40px;max-width:16em}
.section-title.light{color:var(--bg)}

/* buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  font-family:'Inter';font-size:15px;font-weight:500;letter-spacing:.01em;
  padding:14px 26px;border:1px solid transparent;border-radius:2px;
  transition:background .3s ease,color .3s ease,border-color .3s ease;
  cursor:pointer;
}
.btn-solid{background:var(--oak);color:#fff}
.btn-solid:hover{background:var(--oak-deep)}
.btn-outline{border-color:var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--bg)}
.btn-outline-gold{border-color:var(--gold);color:var(--gold)}
.btn-outline-gold:hover{background:var(--gold);color:var(--graphite)}

/* reveal animation */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .7s cubic-bezier(.22,1,.36,1),transform .7s cubic-bezier(.22,1,.36,1)}
.reveal.in{opacity:1;transform:none}

/* ================= HEADER ================= */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;
  transition:background .35s ease,box-shadow .35s ease;
  border-bottom:1px solid transparent;
}
.site-header.scrolled{background:var(--bg);border-bottom:1px solid var(--gold-line)}
.header-inner{display:flex;align-items:center;gap:32px;height:72px}
.logo{display:flex;align-items:baseline;gap:8px}
.logo-mark{font-family:'Prata';font-size:26px;color:var(--ink);line-height:1}
.logo-sub{font-size:9.5px;line-height:1.15;text-transform:uppercase;letter-spacing:.16em;color:var(--oak);align-self:center}
.nav{display:flex;gap:26px;margin-left:auto;font-size:14.5px;color:var(--ink-soft)}
.nav a{transition:color .25s ease;position:relative}
.nav a:hover{color:var(--oak)}
.header-phone{font-size:15px;font-weight:500;color:var(--ink);margin-left:8px}
.header-phone:hover{color:var(--oak)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;padding:8px;margin-left:auto}
.burger span{display:block;width:24px;height:2px;background:var(--ink);transition:transform .3s ease,opacity .3s ease}
.burger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger[aria-expanded="true"] span:nth-child(2){opacity:0}
.burger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ================= HERO ================= */
.hero{padding:132px 0 64px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}
.hero-text h1{font-size:clamp(38px,5.6vw,70px);margin:20px 0 22px}
.hero-lead{font-size:18px;color:var(--ink-soft);max-width:30em}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-media{display:flex;justify-content:center}
.passe{position:relative;width:100%;max-width:440px}
.passe img{position:relative;z-index:2;width:100%;aspect-ratio:3/4;object-fit:cover}
.passe::after{content:"";position:absolute;z-index:1;top:14px;left:14px;right:-14px;bottom:-14px;border:1px solid var(--gold)}
.hero-facts{
  list-style:none;display:flex;flex-wrap:wrap;gap:0;
  margin-top:52px;padding-top:24px;border-top:1px solid var(--gold-line);
  font-size:14px;color:var(--ink-soft)
}
.hero-facts li{display:flex;align-items:center}
.hero-facts li::after{content:"·";margin:0 16px;color:var(--gold)}
.hero-facts li:last-child::after{display:none}

/* ================= ABOUT + SVG ================= */
.about{padding:72px 0}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-text h2{font-size:clamp(28px,3.8vw,44px);margin:14px 0 20px}
.about-text p{color:var(--ink-soft);font-size:18px;max-width:28em}
.about-svg{background:var(--bg-alt);border:1px solid var(--gold-line);padding:32px 28px 26px}
.stair-svg{width:100%;height:auto;display:block;overflow:visible}

/* floor tick */
.s-floor{stroke:var(--graphite);stroke-width:2;opacity:0;transition:opacity .5s ease}
#assembly.play .s-floor{opacity:.6}

/* бетонный марш — тело */
.march{fill:rgba(38,32,26,.055);opacity:0;transition:opacity .8s ease}
#assembly.play .march{opacity:1}

/* 1. каркас — отрисовка зигзага */
.s-frame{fill:none;stroke:var(--graphite);stroke-width:2.6;stroke-linejoin:round;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset 1.1s cubic-bezier(.65,0,.35,1)}
#assembly.play .s-frame{stroke-dashoffset:0}

/* 2. ступени — дубовые проступи въезжают сверху */
.s-treads rect{fill:var(--oak);opacity:0;transform:translateY(-18px);transition:opacity .5s ease,transform .55s cubic-bezier(.22,1,.36,1)}
#assembly.play .s-treads rect{opacity:1;transform:none}
#assembly.play .s-treads rect:nth-child(1){transition-delay:1s}
#assembly.play .s-treads rect:nth-child(2){transition-delay:1.12s}
#assembly.play .s-treads rect:nth-child(3){transition-delay:1.24s}
#assembly.play .s-treads rect:nth-child(4){transition-delay:1.36s}
#assembly.play .s-treads rect:nth-child(5){transition-delay:1.48s}
#assembly.play .s-treads rect:nth-child(6){transition-delay:1.6s}

/* 3. подступенки — кремовые вставки */
.s-risers rect{fill:var(--bg);opacity:0;transition:opacity .5s ease}
#assembly.play .s-risers rect{opacity:1}
#assembly.play .s-risers rect:nth-child(1){transition-delay:2s}
#assembly.play .s-risers rect:nth-child(2){transition-delay:2.06s}
#assembly.play .s-risers rect:nth-child(3){transition-delay:2.12s}
#assembly.play .s-risers rect:nth-child(4){transition-delay:2.18s}
#assembly.play .s-risers rect:nth-child(5){transition-delay:2.24s}
#assembly.play .s-risers rect:nth-child(6){transition-delay:2.3s}

/* 4. ограждение — поручень и балясины */
.s-rail .rail{fill:none;stroke:var(--oak-deep);stroke-width:4;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset .85s ease}
#assembly.play .s-rail .rail{stroke-dashoffset:0;transition-delay:2.5s}
.s-rail .bal{fill:none;stroke:#1b1b1b;stroke-width:2.4;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;transition:stroke-dashoffset .45s ease}
#assembly.play .s-rail .bal{stroke-dashoffset:0}
#assembly.play .s-rail .bal:nth-of-type(1){transition-delay:2.7s}
#assembly.play .s-rail .bal:nth-of-type(2){transition-delay:2.78s}
#assembly.play .s-rail .bal:nth-of-type(3){transition-delay:2.86s}
#assembly.play .s-rail .bal:nth-of-type(4){transition-delay:2.94s}
#assembly.play .s-rail .bal:nth-of-type(5){transition-delay:3.02s}
#assembly.play .s-rail .bal:nth-of-type(6){transition-delay:3.1s}

/* 5. свет — тёплая золотая линия под кромкой */
.s-light line{stroke:var(--gold);stroke-width:3;stroke-linecap:round;opacity:0;transition:opacity .6s ease}
#assembly.play .s-light{filter:drop-shadow(0 0 4px rgba(194,160,92,.85))}
#assembly.play .s-light line{opacity:1}
#assembly.play .s-light line:nth-child(1){transition-delay:3.4s}
#assembly.play .s-light line:nth-child(2){transition-delay:3.5s}
#assembly.play .s-light line:nth-child(3){transition-delay:3.6s}
#assembly.play .s-light line:nth-child(4){transition-delay:3.7s}
#assembly.play .s-light line:nth-child(5){transition-delay:3.8s}
#assembly.play .s-light line:nth-child(6){transition-delay:3.9s}
/* step captions */
.assembly-steps{list-style:none;display:flex;flex-wrap:wrap;gap:6px 22px;margin-top:24px;font-size:13.5px;color:var(--ink-soft)}
.assembly-steps li{display:flex;align-items:center;gap:8px;opacity:.4;transition:opacity .4s ease}
.assembly-steps li.active{opacity:1;color:var(--ink)}
.assembly-steps .num{font-family:'Prata';color:var(--gold);font-size:15px}

/* ================= OBJECTS ================= */
.objects{padding:80px 0 40px}
.objects .section-title{margin-bottom:56px}
.spread{display:grid;grid-template-columns:1.15fr .85fr;gap:52px;align-items:center;margin-bottom:96px}
.spread.reverse{grid-template-columns:.85fr 1.15fr}
.spread.reverse .spread-media{order:2}
.spread.reverse .spread-text{order:1}
.spread-media.pair{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.spread-media.pair img:nth-child(2){margin-top:40px}
.spread-media img{width:100%;aspect-ratio:3/4;object-fit:cover}
.spread-text{max-width:34em}
.case-num{font-family:'Prata';font-size:40px;color:var(--gold);display:block;line-height:1;margin-bottom:14px}
.spread-text h3{font-size:clamp(24px,3vw,34px);margin-bottom:20px}
.spread-text p{color:var(--ink-soft);margin-bottom:14px}
.spread-list{list-style:none;margin:0}
.spread-list li{position:relative;padding-left:22px;margin-bottom:11px;color:var(--ink-soft);font-size:16.5px;line-height:1.5}
.spread-list li:last-child{margin-bottom:0}
.spread-list li::before{content:"";position:absolute;left:0;top:.68em;width:11px;height:1px;background:var(--gold)}
.li-lead{color:var(--oak-deep);font-weight:500}
.mats{font-size:13px;color:var(--oak-deep);letter-spacing:.02em;margin-top:6px}

/* image hover */
.spread-media img,.mosaic img,.passe img{transition:transform .8s cubic-bezier(.22,1,.36,1)}
.spread-media,.mosaic a,.passe{overflow:hidden}
.spread-media img:hover,.mosaic img:hover{transform:scale(1.02)}

/* mosaic */
.mosaic-eyebrow{margin:24px 0 22px}
.mosaic{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.mosaic img{width:100%;height:100%;object-fit:cover;aspect-ratio:3/4}
.mosaic img:nth-child(1){grid-column:span 2;grid-row:span 2}
.mosaic img:nth-child(2){grid-column:span 2}
.mosaic img:nth-child(3){grid-column:span 4;aspect-ratio:4/3}
.mosaic img:nth-child(4){grid-column:span 2}
.mosaic img:nth-child(5){grid-column:span 2}

/* ================= MATERIALS (dark) ================= */
.materials{background:var(--graphite);color:var(--bg);padding:96px 0}
.materials .eyebrow{color:var(--oak)}
.glossary{margin-top:16px;columns:2;column-gap:56px}
.gloss-row{break-inside:avoid;padding:22px 0;border-top:1px solid rgba(194,160,92,.22)}
.gloss-row dt{font-family:'Prata';color:var(--gold);font-size:20px;margin-bottom:6px}
.gloss-row dd{color:#D8CDBB;font-size:16.5px}

/* ================= PROCESS ================= */
.process{padding:96px 0}
.steps{list-style:none;display:grid;grid-template-columns:repeat(4,1fr);gap:36px;margin-top:8px}
.steps li{border-top:1px solid var(--gold-line);padding-top:22px}
.step-num{font-family:'Prata';font-size:52px;color:var(--gold);line-height:1;display:block;margin-bottom:16px}
.steps h3{font-size:22px;margin-bottom:12px}
.steps p{font-size:15.5px;color:var(--ink-soft)}
.process-note{margin-top:44px;font-family:'Prata';font-size:20px;color:var(--ink)}

/* ================= ARCHITECTS ================= */
.architects{background:var(--bg-alt);padding:88px 0}
.architects-inner{max-width:820px}
.architects blockquote{font-family:'Prata';font-size:clamp(24px,3.4vw,36px);line-height:1.3;margin:20px 0 22px;color:var(--ink)}
.architects-note{color:var(--ink-soft);font-size:17px}

/* ================= FOOTER ================= */
.footer{background:var(--graphite);color:var(--bg);padding:88px 0 56px;text-align:center}
.footer-inner{display:flex;flex-direction:column;align-items:center}
.footer-logo{width:120px;height:auto;margin-bottom:30px;opacity:.95}
.footer-phone{font-family:'Prata';font-size:clamp(34px,5.5vw,58px);color:var(--bg);line-height:1}
.footer-phone:hover{color:var(--gold)}
.footer-cta{display:flex;gap:16px;margin:34px 0 30px;flex-wrap:wrap;justify-content:center}
.footer-geo{color:#B3A891;font-size:15px}
.footer-legal{width:100%;max-width:880px;margin:46px auto 0;padding-top:32px;border-top:1px solid rgba(194,160,92,.22);text-align:left}
.legal-title{font-size:11.5px;text-transform:uppercase;letter-spacing:.16em;color:var(--gold);text-align:center;margin-bottom:24px}
.legal-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:20px 56px}
.legal-grid>div{display:flex;flex-direction:column;gap:4px;text-align:center}
.legal-grid dt{font-size:10.5px;text-transform:uppercase;letter-spacing:.09em;color:#9c8e76}
.legal-grid dd{font-size:14px;color:#D8CDBB;line-height:1.45;overflow-wrap:anywhere}
.footer-name{margin-top:44px;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--gold)}

/* ================= RESPONSIVE ================= */
@media(max-width:1024px){
  .nav{display:none}
  .site-header.menu-open .nav{
    display:flex;flex-direction:column;position:absolute;top:72px;left:0;right:0;
    background:var(--bg);border-bottom:1px solid var(--gold-line);
    padding:20px 24px;gap:18px;margin:0;font-size:17px
  }
  .burger{display:flex}
  .header-phone{margin-left:auto;order:2}
  .burger{margin-left:16px;order:3}
  .logo{margin-right:auto}
  .hero-grid,.about-grid{grid-template-columns:1fr;gap:40px}
  .hero-media{order:-1}
  .about-svg{order:-1}
  .steps{grid-template-columns:repeat(2,1fr);gap:32px}
}
@media(max-width:720px){
  body{font-size:16px}
  .hero{padding:110px 0 48px}
  .spread,.spread.reverse{grid-template-columns:1fr;gap:26px;margin-bottom:64px}
  .spread.reverse .spread-media,.spread.reverse .spread-text{order:0}
  .spread-media{order:-1}
  .spread-media.pair img:nth-child(2){margin-top:0}
  .glossary{columns:1}
  .steps{grid-template-columns:1fr;gap:26px}
  .mosaic{grid-template-columns:repeat(2,1fr)}
  .mosaic img,.mosaic img:nth-child(1),.mosaic img:nth-child(2),.mosaic img:nth-child(3),.mosaic img:nth-child(4),.mosaic img:nth-child(5){grid-column:span 1;grid-row:auto;aspect-ratio:3/4}
  .hero-facts{gap:4px 0}
  .hero-facts li::after{margin:0 10px}
  .legal-grid{grid-template-columns:1fr;gap:16px}
}
@media(min-width:1441px){:root{--wrap:1280px}}

/* reduced motion */
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .spread-media img:hover,.mosaic img:hover,.passe img:hover{transform:none}
  *{transition-duration:.001s !important}
}