:root{
  --bg:#0b0d10;
  --bg2:#0f1318;
  --panel:#14191f;
  --panel2:#1a2028;
  --line:#252d38;
  --fg:#e9eef5;
  --muted:#9aa7b6;
  --dim:#6f7c8c;
  --acc:#ff7a18;
  --acc2:#25d0e6;
  --ok:#3ddc97;
  --warn:#ffcf5c;
  --radius:16px;
  --shadow:0 18px 50px rgba(0,0,0,.35);
  --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{margin:0;padding:0}
body{
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(255,122,24,.13), transparent 60%),
    radial-gradient(700px 400px at -10% 10%, rgba(37,208,230,.10), transparent 55%),
    var(--bg);
  color:var(--fg);
  font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Ubuntu,"Helvetica Neue",Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--acc2);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%;display:block}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:16px;top:16px;background:var(--acc);color:#111;padding:10px 14px;border-radius:10px;z-index:100}

/* header */
.site-header{
  position:sticky;top:0;z-index:50;
  border-bottom:1px solid var(--line);
  background:rgba(11,13,16,.82);
  backdrop-filter:blur(14px);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;height:68px}
.logo{display:flex;align-items:center;gap:10px;color:var(--fg);font-weight:800;letter-spacing:.3px;font-size:19px}
.logo:hover{text-decoration:none}
.logo-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--acc),#ffb25e);display:grid;place-items:center;color:#14100a;font-size:18px;font-weight:900;box-shadow:0 8px 24px rgba(255,122,24,.35)}
.logo span{color:var(--acc)}
nav{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
nav a{color:var(--muted);padding:8px 11px;border-radius:9px;font-size:15px;white-space:nowrap}
nav a:hover{color:var(--fg);background:var(--panel);text-decoration:none}
nav a.cta{color:#15100a;background:var(--acc);font-weight:700;margin-left:6px}
nav a.cta:hover{background:#ff8d38;color:#15100a}
.burger{display:none;background:var(--panel);border:1px solid var(--line);color:var(--fg);border-radius:10px;padding:8px 12px;font-size:20px;cursor:pointer}

/* hero */
.hero{padding:66px 0 30px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:44px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:var(--acc);font-weight:700;font-size:13px;letter-spacing:.12em;text-transform:uppercase;margin:0 0 16px}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--acc);display:inline-block}
.hero h1{font-size:clamp(32px,4.4vw,54px);line-height:1.08;margin:0 0 18px;letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--acc)}
.hero p.lead{color:var(--muted);font-size:18px;max-width:560px;margin:0 0 28px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:30px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;border-radius:12px;padding:13px 20px;font-weight:700;font-size:15px;border:1px solid transparent;cursor:pointer;transition:.18s}
.btn-primary{background:linear-gradient(135deg,var(--acc),#ff9b4a);color:#15100a;box-shadow:0 12px 30px rgba(255,122,24,.28)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 16px 36px rgba(255,122,24,.36);text-decoration:none}
.btn-ghost{background:var(--panel);border-color:var(--line);color:var(--fg)}
.btn-ghost:hover{border-color:#3a4553;background:var(--panel2);text-decoration:none}
.btn-small{padding:10px 15px;font-size:14px;border-radius:10px}
.stats{display:flex;gap:26px;flex-wrap:wrap}
.stat b{display:block;font-size:24px;line-height:1.1}
.stat span{color:var(--muted);font-size:13px}
.hero-art{position:relative}
.hero-art .frame{background:linear-gradient(160deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:24px;padding:18px;box-shadow:var(--shadow)}
.hero-art .badge{position:absolute;right:-8px;bottom:22px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:10px 14px;font-size:13px;color:var(--muted);box-shadow:var(--shadow)}
.hero-art .badge b{color:var(--ok)}

/* sections */
section.block{padding:58px 0}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:26px}
.section-head h2{font-size:clamp(25px,3vw,36px);margin:0;letter-spacing:-.01em}
.section-head p{color:var(--muted);margin:8px 0 0;max-width:620px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{background:linear-gradient(170deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.18s}
.card:hover{border-color:#36414f;transform:translateY(-2px)}
.card h3{margin:14px 0 8px;font-size:19px}
.card p{color:var(--muted);margin:0;font-size:15px}
.icon{width:46px;height:46px;border-radius:13px;background:rgba(255,122,24,.12);border:1px solid rgba(255,122,24,.25);display:grid;place-items:center;color:var(--acc)}
.icon.cyan{background:rgba(37,208,230,.10);border-color:rgba(37,208,230,.25);color:var(--acc2)}
.icon.green{background:rgba(61,220,151,.10);border-color:rgba(61,220,151,.25);color:var(--ok)}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.chip{font-size:12px;color:var(--muted);border:1px solid var(--line);background:var(--bg2);padding:5px 9px;border-radius:999px}

/* materials table */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
table{width:100%;border-collapse:collapse;min-width:720px}
th,td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);font-size:14px;vertical-align:top}
th{color:var(--muted);font-weight:600;background:var(--bg2);white-space:nowrap}
tr:last-child td{border-bottom:0}
td b{color:var(--fg)}
.price{color:var(--acc);font-weight:700;white-space:nowrap}
.tag{display:inline-block;font-size:11px;padding:3px 8px;border-radius:999px;background:rgba(37,208,230,.10);color:var(--acc2);border:1px solid rgba(37,208,230,.2)}

/* steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
.step{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;position:relative}
.step::before{counter-increment:step;content:counter(step);position:absolute;right:18px;top:14px;font-size:34px;font-weight:900;color:rgba(255,255,255,.06)}
.step h3{font-size:16px;margin:0 0 8px}
.step p{color:var(--muted);font-size:14px;margin:0}

/* portfolio */
.works{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.work{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.18s}
.work:hover{transform:translateY(-3px);border-color:#36414f}
.work .thumb{aspect-ratio:4/3;background:linear-gradient(160deg,#1b222b,#10151b);display:grid;place-items:center;padding:18px}
.work .thumb svg{width:100%;height:100%}
.work .body{padding:16px 18px 20px}
.work h3{font-size:16px;margin:0 0 6px}
.work p{color:var(--muted);font-size:13px;margin:0}

/* calculator */
.calc-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:22px;align-items:start}
.panel{background:linear-gradient(170deg,var(--panel2),var(--panel));border:1px solid var(--line);border-radius:var(--radius);padding:26px}
.field{margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px;font-weight:600}
.field input,.field select{
  width:100%;background:var(--bg2);border:1px solid var(--line);color:var(--fg);
  border-radius:11px;padding:12px 13px;font-size:15px;outline:none;transition:.15s;
}
.field input:focus,.field select:focus{border-color:var(--acc);box-shadow:0 0 0 3px rgba(255,122,24,.14)}
.field-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.hint{color:var(--dim);font-size:12px;margin-top:5px}
.result{position:sticky;top:88px}
.result .amount{font-size:clamp(34px,5vw,52px);font-weight:900;letter-spacing:-.02em;color:var(--fg);line-height:1.1;margin:8px 0 4px}
.result .amount small{font-size:16px;color:var(--muted);font-weight:600}
.result .per{color:var(--muted);font-size:14px;margin-bottom:18px}
.breakdown{border-top:1px solid var(--line);margin-top:18px;padding-top:14px;display:grid;gap:9px}
.breakdown div{display:flex;justify-content:space-between;gap:16px;font-size:14px;color:var(--muted)}
.breakdown div b{color:var(--fg);font-weight:600}
.disclaimer{color:var(--dim);font-size:12px;margin-top:16px;border-left:3px solid var(--line);padding-left:12px}
.calc-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}

/* faq */
.faq{display:grid;gap:12px}
details{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:0 18px}
details summary{cursor:pointer;padding:16px 0;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:16px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--acc);font-size:20px;line-height:1}
details[open] summary::after{content:"–"}
details p{color:var(--muted);margin:0 0 18px;font-size:14px}

/* contacts */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.contact-card{display:flex;gap:14px;align-items:flex-start;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.contact-card .icon{flex:0 0 auto}
.contact-card h3{margin:0 0 4px;font-size:16px}
.contact-card p{margin:0;color:var(--muted);font-size:14px}
.contact-card a{color:var(--fg)}
.note{color:var(--muted);font-size:14px;border-left:3px solid var(--line);padding-left:14px;margin:24px 0}

/* footer */
.site-footer{border-top:1px solid var(--line);margin-top:30px;color:var(--muted);font-size:14px}
.site-footer .wrap{padding:30px 22px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.site-footer a{color:var(--muted)}
.site-footer a:hover{color:var(--fg)}

/* page */
article.page{padding:52px 0 40px;max-width:820px}
article.page h1{font-size:clamp(28px,3.6vw,42px);margin:0 0 18px;letter-spacing:-.01em}
article.page h2{font-size:23px;margin:34px 0 10px}
article.page p,article.page li{color:#c6ceda}
article.page ul{padding-left:20px}

/* responsive */
@media(max-width:920px){
  .hero-grid{grid-template-columns:1fr;gap:30px}
  .hero-art{max-width:520px}
  .grid-3,.works{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .calc-grid{grid-template-columns:1fr}
  .result{position:static}
}
@media(max-width:680px){
  .site-header .wrap{height:60px}
  nav{display:none}
  nav.open{display:flex;position:absolute;left:0;right:0;top:60px;background:var(--bg2);border-bottom:1px solid var(--line);padding:12px 18px;flex-direction:column;align-items:stretch}
  nav.open a{padding:11px 12px}
  .burger{display:block}
  .grid-3,.grid-2,.works,.steps,.contact-grid,.field-row{grid-template-columns:1fr}
  .hero{padding-top:44px}
  .stats{gap:18px}
  .section-head{flex-direction:column;align-items:flex-start}
}