:root{
  --bg:#ffffff; --fg:#1d2733; --muted:#6b7785; --line:#e6e9ee;
  --brand:#1f6f5c; --brand-d:#175545; --accent:#e08a2b;
  --radius:12px; --max:1140px; --shadow:0 4px 18px rgba(20,40,60,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--fg);background:var(--bg);line-height:1.55}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{line-height:1.2;margin:0 0 .5em}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
.muted{color:var(--muted)}
.section{padding:48px 20px}
.section-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:18px}
.link{font-weight:600}

/* header */
.site-header{position:sticky;top:0;z-index:30;background:rgba(255,255,255,.96);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:20px;height:64px}
.logo{font-weight:800;font-size:19px;color:var(--fg)}
.nav{display:flex;gap:20px;margin-left:12px}
.nav a{color:var(--fg);font-weight:500}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:14px}
.phone{font-weight:700;color:var(--fg);white-space:nowrap}

/* buttons */
.btn{display:inline-block;background:var(--brand);color:#fff;border:0;border-radius:10px;padding:11px 18px;font-size:15px;font-weight:600;cursor:pointer;transition:.15s;text-align:center}
.btn:hover{background:var(--brand-d);text-decoration:none;color:#fff}
.btn-lg{padding:14px 26px;font-size:16px}
.btn-sm{padding:8px 14px;font-size:14px}
.btn-block{display:block;width:100%}
.btn-outline{background:transparent;color:var(--brand);box-shadow:inset 0 0 0 2px var(--brand)}
.btn-outline:hover{background:var(--brand);color:#fff}

/* hero */
.hero{background:linear-gradient(135deg,#1f6f5c 0%,#15493c 100%);color:#fff;padding:72px 20px}
.hero h1{font-size:38px;max-width:760px}
.hero-sub{font-size:19px;max-width:620px;opacity:.92;margin-bottom:26px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero .btn-outline{color:#fff;box-shadow:inset 0 0 0 2px #fff}
.hero .btn-outline:hover{background:#fff;color:var(--brand)}

/* cards grid */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.advantages{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.adv-card{padding:22px;display:flex;gap:14px;align-items:flex-start;box-shadow:var(--shadow)}
.adv-num{flex:0 0 34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.adv-card p{margin:4px 0 0}

/* project card */
.project-card{box-shadow:var(--shadow);display:flex;flex-direction:column}
.project-img,.project-img img{width:100%}
.project-img img{aspect-ratio:4/3;object-fit:cover}
.img-placeholder{aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;font-size:64px;background:#f0f3f5}
.img-placeholder.big{aspect-ratio:16/10;font-size:120px}
.project-body{padding:16px;display:flex;flex-direction:column;gap:10px;flex:1}
.project-body h3{margin:0;font-size:18px}
.specs{list-style:none;display:flex;gap:14px;padding:0;margin:0;color:var(--muted);font-size:14px;flex-wrap:wrap}
.specs.big{font-size:16px;gap:22px}
.specs.big b{color:var(--fg);font-size:22px}
.price{font-weight:800;font-size:20px;color:var(--brand-d)}
.price.big{font-size:26px;margin:6px 0 14px}
.project-body .btn{margin-top:auto}

/* gallery */
.gallery{grid-template-columns:repeat(auto-fill,minmax(260px,1fr))}
.photo-card{box-shadow:var(--shadow)}
.photo-card img{aspect-ratio:4/3;object-fit:cover;width:100%}
.photo-card figcaption{padding:12px 14px;font-size:14px}
.photo-card figcaption span{display:block;margin-top:2px}

/* detail */
.detail{display:grid;grid-template-columns:1.1fr 1fr;gap:30px;margin-top:18px}
.detail-img img{border-radius:var(--radius);width:100%;object-fit:cover}
.prose{margin:14px 0;color:#33414f}

/* cta */
.cta{background:#f5f7f8;padding:56px 20px;text-align:center;border-top:1px solid var(--line)}
.cta h2{font-size:28px}
.cta p{color:var(--muted);max-width:540px;margin:0 auto 22px}

/* contacts */
.contacts-grid{display:grid;grid-template-columns:1fr 1fr;gap:36px;margin-top:18px}
.contact-row{font-size:18px;margin:.4em 0}
.contact-links{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}
.cl{padding:9px 14px;border-radius:8px;font-weight:600;font-size:14px;color:#fff}
.cl-phone{background:#475569}.cl-wa{background:#25d366}.cl-tg{background:#2aabee}.cl-max{background:#7b3ff2}
.cl:hover{opacity:.9;text-decoration:none;color:#fff}

/* footer */
.site-footer{background:#15212c;color:#c4ced8;margin-top:40px;padding:40px 20px 20px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff}
.site-footer a{color:#9fd0c4}
.site-footer .logo{color:#fff;margin-bottom:8px}
.copyright{border-top:1px solid #2a3a48;margin-top:24px;padding-top:16px;font-size:13px;color:#7d8b98}

/* flash */
.flash{padding:12px 16px;border-radius:8px;margin:14px 0}
.flash-ok{background:#e7f6ef;color:#155545}
.flash-error{background:#fde8e8;color:#9b1c1c}

/* modal */
.modal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:16px}
.modal[hidden]{display:none}
.modal-backdrop{position:absolute;inset:0;background:rgba(10,20,30,.55)}
.modal-box{position:relative;background:#fff;border-radius:var(--radius);max-width:440px;width:100%;padding:28px;box-shadow:0 20px 60px rgba(0,0,0,.3)}
.modal-box h3{font-size:22px;margin-bottom:4px}
.modal-sub{color:var(--muted);margin:0 0 16px}
.modal-close{position:absolute;top:10px;right:14px;border:0;background:0;font-size:28px;line-height:1;cursor:pointer;color:#94a0ab}
.modal form label{display:block;margin-bottom:12px;font-size:14px;font-weight:600}
.modal input,.modal textarea{width:100%;margin-top:5px;padding:11px 12px;border:1px solid var(--line);border-radius:8px;font-size:15px;font-family:inherit}
.modal input:focus,.modal textarea:focus{outline:2px solid var(--brand);border-color:var(--brand)}
.req{color:#d9534f}
.hp{position:absolute!important;left:-9999px!important;width:1px;height:1px}
.form-status{margin:10px 0 0;font-weight:600}
.form-status.ok{color:var(--brand-d)}
.form-status.err{color:#c0392b}

/* chat widget */
.chat-widget{position:fixed;right:18px;bottom:18px;z-index:90}
.chat-toggle{display:flex;align-items:center;gap:8px;background:var(--brand);color:#fff;border:0;border-radius:30px;padding:12px 18px;font-size:15px;font-weight:600;cursor:pointer;box-shadow:0 6px 20px rgba(20,60,50,.35)}
.chat-toggle:hover{background:var(--brand-d)}
.chat-toggle.hidden{display:none}
.chat-toggle-icon{font-size:18px}
.chat-panel{width:360px;max-width:calc(100vw - 32px);height:520px;max-height:calc(100vh - 100px);background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 50px rgba(0,0,0,.28);display:flex;flex-direction:column;overflow:hidden}
.chat-panel[hidden]{display:none}
.chat-head{background:var(--brand);color:#fff;padding:12px 14px;display:flex;justify-content:space-between;align-items:center}
.chat-head b{display:block;font-size:15px}
.chat-status{font-size:12px;opacity:.85}
.chat-close{background:0;border:0;color:#fff;font-size:24px;cursor:pointer;line-height:1}
.chat-body{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:10px;background:#f7f9fa}
.chat-msg{max-width:85%;padding:9px 12px;border-radius:12px;font-size:14px;line-height:1.45;white-space:pre-wrap;word-wrap:break-word}
.chat-msg.bot{background:#fff;border:1px solid var(--line);align-self:flex-start;border-bottom-left-radius:3px}
.chat-msg.user{background:var(--brand);color:#fff;align-self:flex-end;border-bottom-right-radius:3px}
.chat-msg.typing{color:var(--muted);font-style:italic}
.chat-sources{font-size:11px;color:var(--muted);align-self:flex-start;padding:0 4px}
.chat-form{display:flex;gap:8px;padding:10px;border-top:1px solid var(--line)}
.chat-form input{flex:1;padding:10px 12px;border:1px solid var(--line);border-radius:20px;font-size:14px;font-family:inherit}
.chat-form input:focus{outline:2px solid var(--brand);border-color:var(--brand)}
.chat-form button{background:var(--brand);color:#fff;border:0;border-radius:50%;width:40px;height:40px;font-size:16px;cursor:pointer;flex:0 0 40px}
.chat-foot{padding:8px 12px;font-size:12px;color:var(--muted);border-top:1px solid var(--line);text-align:center}
.chat-lead-link{background:0;border:0;color:var(--brand);font-weight:600;cursor:pointer;font-size:12px;padding:0;text-decoration:underline}

@media (max-width:820px){
  .nav{display:none}
  .hero h1{font-size:30px}
  .detail,.contacts-grid,.footer-grid{grid-template-columns:1fr}
  .chat-panel{height:70vh}
}