/* SEREBRO — студия интерьерного дизайна */

:root{
  --paper:#f6f3ee;
  --paper-2:#efeae1;
  --ink:#17160f;
  --ink-soft:#2b2921;
  --muted:#6f6759;
  --line:#ddd5c7;
  --accent:#6b4f28;
  --white:#fff;
  --r:2px;
  --max:1320px;
  --font-display:"Cormorant Garamond",Georgia,"Times New Roman",serif;
  --font-body:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:400 16px/1.65 var(--font-body);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;cursor:pointer}
h1,h2,h3,h4{margin:0;font-family:var(--font-display);font-weight:400;line-height:1.05;letter-spacing:-.01em}
h1{font-size:clamp(40px,6.4vw,88px)}
h2{font-size:clamp(30px,4vw,56px)}
h3{font-size:clamp(22px,2.2vw,30px);line-height:1.15}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul{margin:0;padding:0;list-style:none}
::selection{background:var(--ink);color:var(--paper)}

.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 clamp(20px,4vw,56px)}
.section{padding:clamp(56px,8vw,120px) 0}
.section--tight{padding:clamp(36px,5vw,72px) 0}
.section--dark{background:var(--ink);color:var(--paper)}
.section--paper2{background:var(--paper-2)}

.eyebrow{
  font:500 11px/1 var(--font-body);letter-spacing:.2em;text-transform:uppercase;
  color:var(--muted);margin:0 0 18px;
}
.section--dark .eyebrow{color:#a9a08e}

.lead{font-size:clamp(17px,1.5vw,20px);line-height:1.6;color:var(--ink-soft);max-width:58ch}
.section--dark .lead{color:#d8d2c5}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:18px 30px;border:1px solid var(--ink);border-radius:var(--r);
  font:500 13px/1 var(--font-body);letter-spacing:.06em;text-transform:uppercase;
  background:var(--ink);color:var(--paper);transition:.25s ease;
}
.btn:hover{background:transparent;color:var(--ink)}
.btn--ghost{background:transparent;color:var(--ink)}
.btn--ghost:hover{background:var(--ink);color:var(--paper)}
.btn--light{background:var(--paper);border-color:var(--paper);color:var(--ink)}
.btn--light:hover{background:transparent;color:var(--paper)}
.btn:disabled{opacity:.5;cursor:default}

/* header */
.header{
  position:sticky;top:0;z-index:50;background:rgba(246,243,238,.86);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line);
}
.header__in{display:flex;align-items:center;justify-content:space-between;gap:24px;height:76px}
.logo{font-family:var(--font-display);font-size:24px;letter-spacing:.32em;text-transform:uppercase}
.logo span{color:var(--accent)}
.nav{display:flex;gap:34px;align-items:center}
.nav a{font-size:14px;color:var(--ink-soft);position:relative;padding:4px 0}
.nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:1px;background:var(--ink);transition:right .3s}
.nav a:hover::after,.nav a[aria-current="page"]::after{right:0}
.header__phone{font-size:14px;color:var(--ink-soft);white-space:nowrap}
.header__cta{font-size:14px;color:var(--ink);border-bottom:1px solid var(--ink);padding-bottom:2px;white-space:nowrap}
.header__cta:hover{color:var(--accent);border-color:var(--accent)}
.header__actions{display:flex;align-items:center;gap:20px}

.burger{display:none;width:44px;height:44px;border:1px solid var(--line);background:transparent;border-radius:var(--r);align-items:center;justify-content:center}
.burger span{display:block;width:18px;height:1px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:1px;background:var(--ink);transition:.25s}
.burger span::before{top:-6px}.burger span::after{top:6px}

.mobile-nav{display:none;border-bottom:1px solid var(--line);background:var(--paper)}
.mobile-nav.is-open{display:block}
.mobile-nav a{display:block;padding:16px 0;border-top:1px solid var(--line);font-size:16px}

/* hero */
.hero{padding:clamp(32px,5vw,64px) 0 clamp(40px,6vw,80px)}
.hero__grid{display:grid;grid-template-columns:1.05fr .95fr;gap:clamp(24px,4vw,64px);align-items:end}
.hero h1{margin:0 0 28px}
.hero h1 em{font-style:italic;color:var(--accent)}
.hero__media{position:relative;overflow:hidden;border-radius:var(--r);aspect-ratio:4/5}
.hero__media img{width:100%;height:100%;object-fit:cover}
.hero__caption{
  position:absolute;left:0;bottom:0;right:0;padding:56px 20px 18px;
  background:linear-gradient(to top,rgba(0,0,0,.72),rgba(0,0,0,.15) 55%,transparent);
  color:#fff;font-size:12px;letter-spacing:.12em;text-transform:uppercase;
}
.hero__meta{display:flex;gap:40px;margin-top:36px;flex-wrap:wrap}
.stat b{font-family:var(--font-body);font-size:clamp(26px,2.4vw,34px);font-weight:400;letter-spacing:-.02em;display:block;line-height:1;font-variant-numeric:lining-nums}
.stat span{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}

/* projects grid */
.grid-projects{display:grid;grid-template-columns:repeat(2,1fr);gap:clamp(20px,3vw,48px)}
.card{display:block;position:relative}
.card__media{overflow:hidden;aspect-ratio:4/3;background:var(--paper-2)}
.card__media img{width:100%;height:100%;object-fit:cover;transition:transform .8s cubic-bezier(.2,.7,.2,1)}
.card:hover .card__media img{transform:scale(1.04)}
.card__body{display:flex;justify-content:space-between;align-items:flex-start;gap:16px;padding:18px 0 0;border-top:1px solid var(--line);margin-top:18px}
.card__body .card__meta{padding-top:6px}
.card__title{font-family:var(--font-display);font-size:clamp(20px,2vw,26px)}
.card__meta{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.card--wide{grid-column:span 2}
.card--wide .card__media{aspect-ratio:16/8}

/* services */
.services{display:grid;grid-template-columns:repeat(3,1fr);gap:clamp(20px,3vw,40px)}
.service{border-top:1px solid var(--ink);padding-top:24px;display:flex;flex-direction:column;gap:14px}
.service__num{font-size:12px;letter-spacing:.14em;color:var(--accent)}
.service__price{font-family:var(--font-display);font-size:26px;margin-top:auto}
.service ul{display:grid;gap:8px;color:var(--ink-soft);font-size:15px}
.service li{padding-left:14px;position:relative}
.service li::before{content:"";position:absolute;left:0;top:.72em;width:5px;height:1px;background:var(--accent)}
.section--dark .service{border-color:#3a372c}
.section--dark .service ul{color:#cfc9bb}

/* split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,5vw,80px);align-items:center}
.split__media{aspect-ratio:4/3;overflow:hidden}
.split__media img{width:100%;height:100%;object-fit:cover}
.split--rev .split__media{order:2}

/* quote */
.quote{max-width:900px;margin:0 auto;text-align:center}
.quote blockquote{margin:0;font-family:var(--font-display);font-size:clamp(24px,3vw,40px);line-height:1.25;font-style:italic}
.quote cite{display:block;margin-top:24px;font:400 13px/1 var(--font-body);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-style:normal}

/* steps */
.steps{counter-reset:s;display:grid;gap:0}
.step{counter-increment:s;display:grid;grid-template-columns:80px 1fr;gap:24px;padding:26px 0;border-top:1px solid var(--line)}
.step::before{content:"0" counter(s);font-family:var(--font-display);font-size:20px;color:var(--accent)}
.step h3{margin-bottom:8px;font-size:22px}

/* cta band */
.cta{display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap}
.cta h2{max-width:16ch}

/* footer */
.footer{background:var(--ink);color:#cfc9bb;padding:clamp(48px,6vw,80px) 0 32px}
.footer a{color:#cfc9bb}
.footer a:hover{color:#fff}
.footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px}
.footer h4{font:500 11px/1 var(--font-body);letter-spacing:.18em;text-transform:uppercase;color:#8d8677;margin-bottom:18px}
.footer ul{display:grid;gap:10px;font-size:15px}
.footer__bottom{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:56px;padding-top:24px;border-top:1px solid #322f26;font-size:12px;color:#8d8677}
.footer .logo{color:var(--paper);font-size:20px;margin-bottom:16px}

/* forms */
.form{display:grid;gap:18px}
.field{display:grid;gap:8px}
.field label{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.field input,.field textarea,.field select{
  width:100%;padding:14px 16px;border:1px solid var(--line);background:var(--white);
  border-radius:var(--r);font:400 16px/1.4 var(--font-body);color:var(--ink);
}
.field textarea{min-height:120px;resize:none}
.field input:focus,.field textarea:focus{outline:2px solid var(--accent);outline-offset:1px;border-color:transparent}
.field input[aria-invalid="true"],.field textarea[aria-invalid="true"]{border-color:#b3392f}
.field__error{font-size:13px;color:#b3392f;display:none}
.field__error.is-shown{display:block}
.check{display:flex;gap:12px;align-items:flex-start;font-size:13px;color:var(--muted)}
.check input{margin-top:3px;width:16px;height:16px;flex:none}
.form__note{font-size:12px;color:var(--muted)}
.form__status{padding:14px 16px;border:1px solid var(--line);background:var(--white);font-size:14px;display:none}
.form__status.is-shown{display:block}
.form__status.is-error{border-color:#b3392f;color:#b3392f}

/* page head */
.page-head{padding:clamp(40px,6vw,90px) 0 clamp(24px,3vw,40px);border-bottom:1px solid var(--line)}
.page-head h1{font-size:clamp(34px,5vw,68px);max-width:20ch}
.breadcrumbs{font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:24px}
.breadcrumbs a:hover{color:var(--ink)}

/* filters */
.filters{display:flex;gap:10px;flex-wrap:wrap;margin:0 0 clamp(24px,4vw,48px)}
.filter{
  padding:10px 18px;border:1px solid var(--line);border-radius:100px;background:transparent;
  font-size:13px;color:var(--ink-soft);transition:.2s;
}
.filter:hover{border-color:var(--ink)}
.filter.is-active{background:var(--ink);border-color:var(--ink);color:var(--paper)}

/* faq */
.faq{border-top:1px solid var(--line);max-width:900px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  list-style:none;cursor:pointer;padding:22px 40px 22px 0;position:relative;
  font-family:var(--font-display);font-size:clamp(19px,1.8vw,24px);
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:0;top:50%;transform:translateY(-50%);font-family:var(--font-body);font-size:22px;color:var(--muted);transition:.2s}
.faq details[open] summary::after{content:"–"}
.faq p{padding:0 0 24px;color:var(--ink-soft);max-width:70ch}

/* contacts */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(28px,5vw,72px)}
.contact-list{display:grid;gap:24px;margin-top:32px}
.contact-item b{display:block;font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.contact-item a,.contact-item span{font-size:18px}
.contact-item a{border-bottom:1px solid rgba(23,22,15,.25)}
.contact-item a:hover{border-color:var(--ink)}
.map{margin-top:32px;aspect-ratio:16/10;border:1px solid var(--line);overflow:hidden}
.map iframe{width:100%;height:100%;border:0;filter:grayscale(1) contrast(.95)}

/* lightbox */
.lightbox{position:fixed;inset:0;background:rgba(12,11,8,.94);z-index:100;display:none;align-items:center;justify-content:center;padding:24px}
.lightbox.is-open{display:flex}
.lightbox img{max-width:min(1200px,100%);max-height:86vh;object-fit:contain}
.lightbox__close{position:absolute;top:18px;right:20px;width:44px;height:44px;border:1px solid rgba(255,255,255,.3);background:transparent;color:#fff;border-radius:50%;font-size:22px;line-height:1}
.lightbox__cap{position:absolute;bottom:18px;left:0;right:0;text-align:center;color:#cfc9bb;font-size:13px}

@media (prefers-reduced-motion:reduce){
  .card__media img{transition:none}
  html{scroll-behavior:auto}
}

/* mobile */
@media (max-width:1024px){
  .hero__grid{grid-template-columns:1fr}
  .hero__media{aspect-ratio:16/10;order:-1}
  .services{grid-template-columns:1fr 1fr}
  .footer__grid{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  .grid-projects{gap:40px}
  .nav,.header__phone,.header__cta{display:none}
  .burger{display:inline-flex}
  .header__in{height:64px}
  .split,.split--rev .split__media{grid-template-columns:1fr;order:0}
  .split__media{aspect-ratio:4/3}
  .grid-projects{grid-template-columns:1fr}
  .card--wide{grid-column:auto}
  .card--wide .card__media{aspect-ratio:4/3}
  .contact-grid{grid-template-columns:1fr}
  .step{grid-template-columns:52px 1fr;gap:16px}
  .cta{align-items:flex-start}
  .section{padding:56px 0}
}
@media (max-width:520px){
  .services{grid-template-columns:1fr}
  .footer__grid{grid-template-columns:1fr;gap:28px}
  .hero__meta{gap:24px}
  .btn{width:100%}
  .cta .btn{width:auto}
}