/* ===== Petroffskiy Architecture — фирменные токены ===== */
:root{
  --brand:#b5561f;        /* терракота */
  --brand-2:#8a3c14;
  --accent:#d99a4e;       /* охра */
  --bg:#12100e;           /* тёмный тёплый */
  --bg-2:#1a1714;
  --surface:#1c1917;
  --surface-2:#241f1b;
  --text:#f2ece4;
  --muted:#a89a8c;
  --border:#332c26;
  --grad:linear-gradient(120deg,var(--brand),var(--accent));
  --container:1240px;
  --radius-1:2px;
  --radius-2:4px;
  --radius-3:6px;
  --font-display:"Segoe UI",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --font-sans:"Segoe UI",system-ui,-apple-system,Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,"SFMono-Regular","JetBrains Mono","Cascadia Code",Menlo,Consolas,monospace;
  --ease-out:cubic-bezier(.22,.61,.36,1);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:clamp(15px,1.05vw,17px);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  position:relative;
}
body::before{
  content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(50% 40% at 82% 8%, color-mix(in srgb,var(--brand) 26%,transparent), transparent 70%),
    radial-gradient(45% 45% at 8% 88%, color-mix(in srgb,var(--accent) 18%,transparent), transparent 70%),
    var(--bg);
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(100% - 2.4rem, var(--container));margin-inline:auto}
.mono{font-family:var(--mono);letter-spacing:.02em}
.muted{color:var(--muted)}

.skip{position:absolute;left:-999px;top:0;background:var(--brand);color:#fff;padding:.6rem 1rem;z-index:200}
.skip:focus{left:0}

/* ===== Header ===== */
.site-header{
  position:sticky;top:0;z-index:100;
  background:color-mix(in srgb,var(--bg) 72%,transparent);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--border);
}
.hd-inner{display:flex;align-items:center;justify-content:space-between;gap:1rem;height:74px}
.brand{display:flex;align-items:center;gap:.7rem;color:var(--text)}
.brand-mark{color:var(--brand);display:grid;place-items:center}
.brand-text{display:flex;flex-direction:column;line-height:1}
.brand-text b{font-size:1.15rem;letter-spacing:.02em;font-weight:800}
.brand-text em{font-family:var(--mono);font-style:normal;font-size:.66rem;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);margin-top:.25rem}
.nav{display:flex;align-items:center;gap:.4rem}
.nav a{padding:.55rem .85rem;font-size:.92rem;color:var(--muted);border-radius:var(--radius-2);transition:color .18s,background .18s}
.nav a:hover,.nav a.is-active{color:var(--text)}
.nav .nav-cta{background:var(--grad);color:#1a120b;font-weight:700;margin-left:.5rem;padding:.6rem 1.1rem}
.nav .nav-cta:hover{filter:brightness(1.06)}
.burger{display:none;background:none;border:1px solid var(--border);border-radius:var(--radius-2);width:44px;height:40px;cursor:pointer;padding:0;flex-direction:column;gap:5px;align-items:center;justify-content:center}
.burger span{width:20px;height:2px;background:var(--text);transition:.25s}
.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)}

/* ===== Buttons ===== */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;justify-content:center;
  background:var(--grad);color:#1a120b;font-weight:700;
  padding:.85rem 1.6rem;border:none;border-radius:var(--radius-2);
  cursor:pointer;font-size:.98rem;transition:transform .18s var(--ease-out),filter .18s,box-shadow .18s;
  letter-spacing:.01em;
}
.btn:hover{transform:translateY(-2px);filter:brightness(1.07)}
.btn-lg{padding:1.05rem 2rem;font-size:1.05rem}
.btn-block{width:100%}
.btn-ghost{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 12%,transparent)}

/* ===== Hero ===== */
.hero{position:relative;min-height:min(92vh,760px);display:flex;align-items:flex-end;padding-bottom:clamp(2rem,6vw,5rem);border-bottom:1px solid var(--border)}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media img{width:100%;height:100%;object-fit:cover}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(12,10,8,.35) 0%,rgba(12,10,8,.55) 45%,rgba(12,10,8,.92) 100%)}
.hero-inner{position:relative;z-index:1;padding-top:6rem}
.hero-kicker{color:var(--accent);text-transform:uppercase;letter-spacing:.28em;font-size:.72rem;margin:0 0 1rem}
.hero-title{font-family:var(--font-display);font-weight:800;font-size:clamp(2.8rem,8vw,6rem);line-height:.98;margin:0;letter-spacing:-.02em}
.hero-sub{max-width:56ch;color:#e7ddd1;font-size:clamp(1rem,1.5vw,1.2rem);margin:1.3rem 0 2rem}
.hero-cta{display:flex;flex-wrap:wrap;gap:.9rem}
.hero-stats{display:flex;gap:clamp(1.5rem,4vw,3.5rem);margin-top:2.6rem;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:clamp(1.8rem,3vw,2.6rem);font-weight:800;color:var(--text)}
.hero-stats span{font-size:.72rem;text-transform:uppercase;letter-spacing:.18em;color:var(--muted)}

/* ===== Sections ===== */
.section{padding:clamp(3.5rem,8vw,7rem) 0}
.section--alt{background:var(--bg-2);border-block:1px solid var(--border)}
.sec-head{display:flex;flex-wrap:wrap;gap:1.5rem 3rem;align-items:flex-end;justify-content:space-between;margin-bottom:2.6rem}
.eyebrow{color:var(--accent);text-transform:uppercase;letter-spacing:.22em;font-size:.7rem;margin:0 0 .8rem}
.sec-title{font-family:var(--font-display);font-weight:800;font-size:clamp(1.9rem,4vw,3rem);line-height:1.02;margin:0;letter-spacing:-.02em}
.sec-lead{max-width:44ch;color:var(--muted);margin:0}
.lead-p{font-size:clamp(1.05rem,1.6vw,1.3rem);color:#e7ddd1;line-height:1.5}

/* ===== Filters ===== */
.filters{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:2rem}
.chip{padding:.5rem 1rem;border:1px solid var(--border);border-radius:var(--radius-pill,999px);font-size:.85rem;color:var(--muted);transition:.18s}
.chip:hover{color:var(--text);border-color:var(--brand)}
.chip.is-active{background:var(--brand);border-color:var(--brand);color:#fff}

/* ===== Masonry / tiles ===== */
.masonry{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.other-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.tile{position:relative;display:block;overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-3);background:var(--surface);min-height:280px}
.tile--wide{grid-column:span 2}
.tile-media{position:absolute;inset:0;z-index:0}
.tile-media img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease-out),filter .4s}
.tile::after{content:"";position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,rgba(12,10,8,0) 30%,rgba(12,10,8,.85) 100%);transition:opacity .3s}
.tile-body{position:absolute;left:0;right:0;bottom:0;z-index:2;padding:1.3rem;display:flex;flex-direction:column;gap:.3rem;transform:translateY(6px);transition:transform .35s var(--ease-out)}
.tile-cat{font-size:.68rem;text-transform:uppercase;letter-spacing:.16em;color:var(--accent)}
.tile-title{font-size:1.25rem;font-weight:800;line-height:1.1;font-family:var(--font-display)}
.tile-meta{font-size:.82rem;color:#d8ccbe;max-height:0;opacity:0;overflow:hidden;transition:.35s var(--ease-out)}
.tile-arrow{position:absolute;top:1.1rem;right:1.1rem;z-index:2;width:38px;height:38px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.35);border-radius:var(--radius-2);color:#fff;background:rgba(12,10,8,.25);opacity:0;transform:translateX(-6px);transition:.3s var(--ease-out)}
.tile:hover .tile-media img{transform:scale(1.06)}
.tile:hover .tile-body{transform:translateY(0)}
.tile:hover .tile-meta{max-height:60px;opacity:1;margin-top:.15rem}
.tile:hover .tile-arrow{opacity:1;transform:translateX(0)}
.tile:hover{border-color:var(--brand)}

/* ===== Services ===== */
.svc-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.1rem}
.svc-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-3);padding:1.8rem;transition:.25s var(--ease-out)}
.svc-card:hover{border-color:var(--brand);transform:translateY(-4px)}
.svc-num{display:block;color:var(--accent);font-size:.9rem;margin-bottom:1rem}
.svc-card h3{font-size:1.2rem;margin:0 0 .6rem;font-family:var(--font-display)}
.svc-card p{margin:0;color:var(--muted);font-size:.95rem}

/* ===== CTA band ===== */
.cta-band{background:var(--surface-2);border-block:1px solid var(--border)}
.cta-inner{display:flex;flex-wrap:wrap;gap:1.8rem 3rem;align-items:center;justify-content:space-between}
.cta-inner .sec-lead{max-width:50ch}

/* ===== Project page ===== */
.proj-hero{position:relative;min-height:min(70vh,560px);display:flex;align-items:flex-end;padding-bottom:clamp(2rem,5vw,4rem);border-bottom:1px solid var(--border)}
.proj-hero-media{position:absolute;inset:0;z-index:0}
.proj-hero-media img{width:100%;height:100%;object-fit:cover}
.proj-hero-inner{position:relative;z-index:1;padding-top:5rem}
.breadcrumb{color:var(--accent);text-transform:uppercase;letter-spacing:.14em;font-size:.72rem;margin:0 0 1rem}
.breadcrumb a{color:#e7ddd1}
.proj-title{font-family:var(--font-display);font-weight:800;font-size:clamp(2.2rem,6vw,4.6rem);line-height:1;margin:0;letter-spacing:-.02em}
.proj-summary{max-width:60ch;color:#e7ddd1;font-size:clamp(1.05rem,1.6vw,1.3rem);margin:1.1rem 0 0}
.proj-body{padding-top:clamp(3rem,6vw,5rem)}
.proj-layout{display:grid;grid-template-columns:280px 1fr;gap:clamp(2rem,5vw,4.5rem);margin-bottom:clamp(2.5rem,6vw,4rem)}
.proj-facts{align-self:start;position:sticky;top:100px;display:flex;flex-direction:column;gap:1rem;border:1px solid var(--border);border-radius:var(--radius-3);padding:1.5rem;background:var(--surface)}
.proj-facts dl{margin:0;display:flex;flex-direction:column;gap:1rem}
.proj-facts dt{font-size:.66rem;text-transform:uppercase;letter-spacing:.16em;color:var(--muted);margin-bottom:.2rem}
.proj-facts dd{margin:0;font-weight:600}
.proj-facts .btn,.proj-facts .btn-ghost{width:100%}
.proj-block{margin-bottom:2.4rem}
.proj-h{font-family:var(--font-display);font-size:1.5rem;margin:0 0 .7rem;padding-left:1rem;border-left:3px solid var(--brand)}
.proj-block p{margin:0;color:#d8ccbe;font-size:1.05rem}
.proj-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:1.1rem}
.pg-item{margin:0;overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-3);background:var(--surface)}
.pg-item--wide{grid-column:span 2}
.pg-item img{width:100%;height:100%;object-fit:cover;aspect-ratio:16/10;transition:transform .6s var(--ease-out)}
.pg-item--wide img{aspect-ratio:21/9}
.pg-item:hover img{transform:scale(1.03)}

/* ===== About ===== */
.about-grid{display:grid;grid-template-columns:0.9fr 1.1fr;gap:clamp(2rem,5vw,4rem);align-items:center}
.about-portrait{overflow:hidden;border:1px solid var(--border);border-radius:var(--radius-3)}
.about-portrait img{width:100%;aspect-ratio:4/5;object-fit:cover}
.approach-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.1rem}
.approach-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-3);padding:1.6rem}
.approach-card h3{font-family:var(--font-display);font-size:1.1rem;margin:.8rem 0 .5rem}
.approach-card p{margin:0;color:var(--muted);font-size:.92rem}
.skills-wrap{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem)}
.tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.3rem}
.tag{border:1px solid var(--border);padding:.5rem .95rem;border-radius:var(--radius-2);font-size:.85rem;color:#e7ddd1;background:var(--surface)}
.tag:hover{border-color:var(--brand)}
.bars{list-style:none;margin:1.3rem 0 0;padding:0;display:flex;flex-direction:column;gap:1.1rem}
.bar-top{display:flex;justify-content:space-between;font-size:.9rem;margin-bottom:.4rem}
.bar-top .mono{color:var(--accent)}
.bar{display:block;height:6px;background:var(--surface-2);border-radius:var(--radius-pill,999px);overflow:hidden;border:1px solid var(--border)}
.bar-fill{display:block;height:100%;width:0;background:var(--grad);border-radius:inherit;transition:width 1.1s var(--ease-out)}
.js .reveal .bar-fill{width:0}
.bar-fill.go{width:var(--w)}
.awards-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem)}
.award-list{list-style:none;margin:1.3rem 0 0;padding:0;display:flex;flex-direction:column}
.award-list li{padding:1rem 0;border-bottom:1px solid var(--border);display:flex;gap:1rem;align-items:baseline;font-size:1rem}
.award-list .mono{color:var(--accent);flex:0 0 auto}
.clients{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1.3rem}
.client-chip{border:1px dashed var(--border);padding:.55rem 1rem;border-radius:var(--radius-2);font-size:.9rem;color:#e7ddd1}

/* ===== Contact ===== */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.contact-list{list-style:none;margin:2rem 0;padding:0;display:flex;flex-direction:column;gap:.9rem}
.contact-list li{display:flex;gap:1rem;align-items:baseline;border-bottom:1px solid var(--border);padding-bottom:.9rem}
.contact-list .mono{flex:0 0 90px;color:var(--muted);text-transform:uppercase;font-size:.68rem;letter-spacing:.14em}
.contact-list a{color:var(--text);border-bottom:1px solid transparent}
.contact-list a:hover{border-color:var(--brand)}
.social-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.5rem}
.social-chip{border:1px solid var(--border);padding:.55rem 1rem;border-radius:var(--radius-2);font-size:.88rem;transition:.2s}
.social-chip:hover{border-color:var(--brand);color:var(--accent)}
.contact-form-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-3);padding:clamp(1.5rem,3vw,2.4rem)}
.field{display:block;margin-bottom:1.2rem}
.field span{display:block;font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin-bottom:.5rem}
.field input,.field textarea{
  width:100%;background:var(--bg-2);border:1px solid var(--border);border-radius:var(--radius-2);
  color:var(--text);padding:.85rem 1rem;font-family:inherit;font-size:1rem;transition:border .2s,box-shadow .2s;resize:vertical;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 25%,transparent)}
.field input::placeholder,.field textarea::placeholder{color:#6b5f54}
.form-note{font-size:.78rem;margin:1rem 0 0}
.alert{border:1px solid var(--border);border-radius:var(--radius-3);padding:1.4rem}
.alert p{margin:.4rem 0}
.alert--ok{border-color:var(--brand);background:color-mix(in srgb,var(--brand) 12%,transparent)}
.alert--ok b{font-size:1.25rem;font-family:var(--font-display)}
.alert--ok .btn-ghost{margin-top:1rem}
.alert--err{border-color:#c0392b;background:color-mix(in srgb,#c0392b 14%,transparent);margin-bottom:1.4rem}

/* ===== Footer ===== */
.site-footer{background:var(--bg-2);border-top:1px solid var(--border);padding-top:clamp(3rem,6vw,4.5rem);margin-top:0}
.ft-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:2rem;padding-bottom:2.5rem}
.ft-brand{max-width:30ch}
.brand--ft{margin-bottom:1rem}
.ft-note{color:var(--muted);font-size:.92rem;margin:0}
.ft-col h4{font-size:.72rem;text-transform:uppercase;letter-spacing:.16em;color:var(--muted);margin:0 0 1.1rem}
.ft-col a{display:block;color:#e7ddd1;font-size:.95rem;margin-bottom:.6rem;transition:color .18s}
.ft-col a:hover{color:var(--accent)}
.ft-col .muted{display:block;font-size:.85rem;margin-top:.4rem}
.ft-bottom{display:flex;flex-wrap:wrap;gap:1rem;justify-content:space-between;border-top:1px solid var(--border);padding:1.5rem 0;color:var(--muted);font-size:.85rem}
.ft-bottom .mono{color:var(--accent);text-transform:uppercase;letter-spacing:.14em;font-size:.72rem}

/* ===== Reveal ===== */
.js .reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease-out),transform .7s var(--ease-out)}
.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  .js .reveal{opacity:1;transform:none;transition:none}
  *{scroll-behavior:auto}
  .tile-media img,.pg-item img{transition:none}
}

/* ===== Responsive ===== */
@media (max-width:960px){
  .masonry,.other-grid,.svc-grid,.approach-grid{grid-template-columns:repeat(2,1fr)}
  .tile--wide{grid-column:span 2}
  .proj-layout{grid-template-columns:1fr}
  .proj-facts{position:static}
  .about-grid,.skills-wrap,.awards-grid,.contact-grid{grid-template-columns:1fr}
  .ft-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .burger{display:flex}
  .nav{position:fixed;inset:74px 0 auto 0;flex-direction:column;align-items:stretch;background:var(--bg);border-bottom:1px solid var(--border);padding:1rem 1.2rem;gap:.3rem;transform:translateY(-140%);transition:transform .3s var(--ease-out);z-index:99}
  .nav.open{transform:translateY(0)}
  .nav a{padding:.85rem}
  .nav .nav-cta{margin-left:0;margin-top:.5rem;text-align:center}
  .masonry,.other-grid,.svc-grid,.approach-grid,.proj-gallery{grid-template-columns:1fr}
  .tile--wide,.pg-item--wide{grid-column:span 1}
  .tile{min-height:240px}
  .tile-body{transform:none}
  .tile-meta{max-height:60px;opacity:1}
  .ft-grid{grid-template-columns:1fr}
  .hero-stats{gap:1.5rem}
}