/* Снеготаяние СПб · USYSTEMS — общие стили (Manrope, локальные woff2) */
@font-face{font-family:'Manrope';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/manrope-400-cyrillic.woff2') format('woff2');unicode-range:U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:'Manrope';font-style:normal;font-weight:400;font-display:swap;src:url('fonts/manrope-400-latin.woff2') format('woff2')}
@font-face{font-family:'Manrope';font-style:normal;font-weight:600;font-display:swap;src:url('fonts/manrope-600-cyrillic.woff2') format('woff2');unicode-range:U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:'Manrope';font-style:normal;font-weight:600;font-display:swap;src:url('fonts/manrope-600-latin.woff2') format('woff2')}
@font-face{font-family:'Manrope';font-style:normal;font-weight:700;font-display:swap;src:url('fonts/manrope-700-cyrillic.woff2') format('woff2');unicode-range:U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:'Manrope';font-style:normal;font-weight:700;font-display:swap;src:url('fonts/manrope-700-latin.woff2') format('woff2')}
@font-face{font-family:'Manrope';font-style:normal;font-weight:800;font-display:swap;src:url('fonts/manrope-800-cyrillic.woff2') format('woff2');unicode-range:U+0400-045F,U+0490-0491,U+04B0-04B1,U+2116}
@font-face{font-family:'Manrope';font-style:normal;font-weight:800;font-display:swap;src:url('fonts/manrope-800-latin.woff2') format('woff2')}

:root{
  --ink:#0d1b26;          /* чернильный тёмно-синий */
  --ink-2:#16303f;
  --paper:#f4f7f9;        /* снеговая бумага */
  --card:#ffffff;
  --accent:#0f7fa8;       /* лёд/вода */
  --accent-2:#31b3dc;
  --accent-deep:#0a5d7f;
  --warm:#e8622c;         /* тёплый контр-акцент (газ/тепло) */
  --line:#dbe5ea;
  --mut:#5c7280;
  --ok:#1d8a54;
  --shadow:0 10px 30px rgba(13,27,38,.08);
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Manrope',-apple-system,'Segoe UI',Roboto,Arial,sans-serif;color:var(--ink);background:var(--paper);line-height:1.6;font-size:16.5px}
img{max-width:100%;display:block}
a{color:var(--accent-deep)}
.container{max-width:1160px;margin:0 auto;padding:0 22px}

/* ── Шапка ─────────────────────────── */
.topbar{position:sticky;top:0;z-index:50;background:rgba(244,247,249,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.topbar-in{display:flex;align-items:center;gap:26px;height:66px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:19px;letter-spacing:.2px}
.brand .mark{width:34px;height:34px;flex:none}
.brand small{display:block;font-weight:600;font-size:11px;color:var(--mut);letter-spacing:.6px;text-transform:uppercase}
.nav{display:flex;gap:22px;margin-left:auto;flex-wrap:wrap}
.nav a{text-decoration:none;color:var(--ink-2);font-weight:600;font-size:14.5px;padding:6px 2px;border-bottom:2px solid transparent}
.nav a:hover{color:var(--accent);border-bottom-color:var(--accent-2)}
.nav a.cta-mini{background:var(--accent);color:#fff;border-radius:999px;padding:8px 18px;border:0}
.nav a.cta-mini:hover{background:var(--accent-deep);color:#fff}
.top-phone{font-weight:800;font-size:15.5px;color:var(--ink);text-decoration:none;white-space:nowrap;letter-spacing:.2px}
.top-phone:hover{color:var(--accent)}
.top-phone small{display:block;font-size:10.5px;color:var(--mut);font-weight:600;letter-spacing:.5px;text-transform:uppercase}
@media(max-width:1020px){.top-phone small{display:none}}
@media(max-width:920px){.top-phone{font-size:16px}}
.btn-ghost2{border:1.5px solid rgba(255,255,255,.45);color:#fff;background:transparent}
.btn-ghost2:hover{border-color:#fff;background:rgba(255,255,255,.08);color:#fff}
@media(max-width:920px){.nav{display:none}}

/* ── Мобильное меню (бургер) ──────── */
.mnav{display:none}
@media(max-width:920px){
  .mnav{display:block;margin-left:auto;flex:none}
  .mnav summary{list-style:none;cursor:pointer;font-weight:800;font-size:14px;padding:10px 16px;border:1.5px solid var(--line);border-radius:10px;background:#fff;color:var(--ink)}
  .mnav summary::-webkit-details-marker{display:none}
  .mnav[open]{position:relative}
  .mnav[open] .mnav-list{position:absolute;right:0;top:calc(100% + 10px);background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 44px rgba(13,27,38,.18);padding:10px;min-width:230px;z-index:60;display:grid}
  .mnav-list a{padding:13px 16px;font-size:16px;font-weight:600;text-decoration:none;color:var(--ink);border-bottom:1px solid var(--line)}
  .mnav-list a:last-child{border-bottom:0}
  .mnav-list a:hover{color:var(--accent);background:var(--paper)}
  .mnav-tel{font-weight:800;color:var(--accent-deep)}
}

/* ── Мобильная панель действий ───── */
.mbar{display:none}
@media(max-width:920px){
  .mbar{display:grid;grid-template-columns:1.1fr .9fr;gap:10px;position:fixed;left:0;right:0;bottom:0;z-index:70;padding:10px 14px calc(10px + env(safe-area-inset-bottom,0px));background:#fff;border-top:1px solid var(--line);box-shadow:0 -10px 30px rgba(13,27,38,.14);align-items:center}
  .mbar-tel{display:flex;flex-direction:column;justify-content:center;padding:9px 14px;border-radius:12px;border:1.5px solid var(--accent);text-decoration:none;color:var(--accent-deep);min-height:48px}
  .mbar-tel b{font-size:15.5px;line-height:1.2}
  .mbar-tel span{font-size:12px;color:var(--mut)}
  .mbar-cta{display:flex;align-items:center;justify-content:center;text-align:center;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-weight:800;font-size:15px;border-radius:12px;padding:13px 10px;text-decoration:none;min-height:48px}
  .mbar-cta:hover{color:#fff;filter:brightness(1.06)}
  body{padding-bottom:86px}
}

/* ── Герой ─────────────────────────── */
.hero{position:relative;color:#fff;overflow:hidden;background:linear-gradient(160deg,#0d1b26 0%,#123245 55%,#0f4c66 100%)}
.hero .bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.38}
.hero-in{position:relative;padding:96px 0 88px;max-width:720px}
.hero .kicker{display:inline-block;background:rgba(49,179,220,.18);border:1px solid rgba(49,179,220,.45);color:#cfeefb;border-radius:999px;padding:7px 16px;font-size:13px;font-weight:700;letter-spacing:.8px;text-transform:uppercase;margin-bottom:22px}
.hero h1{font-size:clamp(30px,4.6vw,52px);line-height:1.12;font-weight:800;letter-spacing:-.5px}
.hero p.lead{margin-top:20px;font-size:clamp(16px,1.6vw,19.5px);color:#d9e7ee;max-width:600px}
.hero .actions{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.btn{display:inline-block;border-radius:12px;padding:15px 28px;font-weight:700;font-size:16px;text-decoration:none;transition:transform .15s ease,box-shadow .15s ease,background .15s ease}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--accent-2);color:#06222f;box-shadow:0 8px 24px rgba(49,179,220,.35)}
.btn-primary:hover{background:#57c6e8;color:#06222f}
.btn-ghost{border:1.5px solid rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.hero .facts{display:flex;gap:34px;margin-top:46px;flex-wrap:wrap}
.hero .facts div b{display:block;font-size:30px;font-weight:800;color:#fff}
.hero .facts div span{font-size:13.5px;color:#a9c6d4}

/* ── Секции ────────────────────────── */
section{padding:72px 0}
.sec-alt{background:#fff}
.sec-dark{background:var(--ink);color:#e6eff4}
.sec-dark h2{color:#fff}
.sec-head{max-width:760px;margin-bottom:40px}
.kicker2{display:inline-block;color:var(--accent);font-weight:800;font-size:13px;letter-spacing:1.2px;text-transform:uppercase;margin-bottom:10px}
h2{font-size:clamp(25px,3.2vw,36px);line-height:1.18;font-weight:800;letter-spacing:-.3px}
.sec-head p{margin-top:14px;color:var(--mut);font-size:17px}
.sec-dark .sec-head p{color:#a9c6d4}
h3{font-size:21px;font-weight:800;margin-bottom:10px}

/* ── Карточки/сетки ────────────────── */
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:940px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow)}
.card .num{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;font-weight:800;font-size:19px;margin-bottom:16px}
.card p{color:var(--mut);font-size:15.5px}
.card h3{font-size:19px}
.metric b{display:block;font-size:34px;font-weight:800;color:var(--accent-deep);letter-spacing:-.5px}
.metric span{color:var(--mut);font-size:14.5px}
.metrics-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
@media(max-width:940px){.metrics-row{grid-template-columns:repeat(2,1fr)}}

/* ── Медиа-карточки объектов ───────── */
.obj-card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column}
.obj-card .ph{position:relative;aspect-ratio:16/10;overflow:hidden;background:#dde7ec}
.obj-card .ph img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.obj-card:hover .ph img{transform:scale(1.045)}
.obj-card .ph .tag{position:absolute;left:14px;top:14px;background:rgba(13,27,38,.82);color:#fff;font-size:12.5px;font-weight:700;padding:6px 12px;border-radius:999px}
.obj-card .body{padding:20px 22px 24px}
.obj-card h3{font-size:18.5px}
.obj-card p{color:var(--mut);font-size:14.8px}
.obj-card .stats{display:flex;gap:18px;margin-top:14px;flex-wrap:wrap}
.obj-card .stats b{font-size:15px;color:var(--accent-deep)}
.obj-card .stats span{font-size:12.5px;color:var(--mut);display:block}

/* ── Сравнение (vs) ────────────────── */
.vs{display:grid;grid-template-columns:1fr 1fr;gap:22px}
@media(max-width:860px){.vs{grid-template-columns:1fr}}
.vs .side{border-radius:var(--radius);padding:28px;border:1px solid var(--line);background:#fff}
.vs .side.win{border:2px solid var(--accent);box-shadow:0 12px 34px rgba(15,127,168,.16)}
.vs .side h3{display:flex;align-items:center;gap:10px}
.vs .side ul{list-style:none;margin-top:14px}
.vs .side li{padding:9px 0 9px 30px;position:relative;color:var(--ink-2);font-size:15.3px;border-bottom:1px dashed var(--line)}
.vs .side li:last-child{border-bottom:0}
.vs .side li::before{content:'';position:absolute;left:4px;top:14px;width:9px;height:9px;border-radius:50%}
.vs .side li.plus::before{background:var(--ok)}
.vs .side li.minus::before{background:#c0392b}
.vs .badge-win{display:inline-block;background:var(--accent);color:#fff;font-size:12px;font-weight:800;border-radius:999px;padding:4px 12px;letter-spacing:.5px;text-transform:uppercase}

/* ── Таблицы ───────────────────────── */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;font-size:15px;min-width:640px}
th{background:var(--ink);color:#fff;text-align:left;padding:13px 16px;font-weight:700;font-size:13.5px;letter-spacing:.4px}
td{padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:0}
tbody tr:nth-child(even){background:#f7fafc}
td b{color:var(--accent-deep)}
.note{font-size:13.5px;color:var(--mut);margin-top:12px}

/* ── Калькулятор ───────────────────── */
.calc{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);padding:34px}
.calc-controls label{font-weight:700;font-size:14px;display:block;margin-bottom:8px}
.calc-controls input[type=range]{width:100%;accent-color:var(--accent)}
.calc-area{display:flex;align-items:baseline;gap:10px;margin-bottom:6px}
.calc-area output{font-size:44px;font-weight:800;color:var(--accent-deep)}
.calc-area span{color:var(--mut)}
.calc-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;margin-top:26px}
@media(max-width:860px){.calc-grid{grid-template-columns:1fr}}
.calc-out{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:22px}
.calc-out .row{display:flex;justify-content:space-between;gap:14px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:15.3px}
.calc-out .row:last-of-type{border-bottom:0}
.calc-out .row b{white-space:nowrap}
.calc-out .total{margin-top:14px;background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border-radius:12px;padding:16px 18px;display:flex;justify-content:space-between;align-items:center}
.calc-out .total b{font-size:22px}
.calc-out .small{font-size:12.8px;color:var(--mut);margin-top:12px}
.variant{display:inline-block;border:1.5px solid var(--line);border-radius:999px;padding:8px 18px;font-weight:700;font-size:14px;cursor:pointer;background:#fff;margin:0 8px 8px 0;user-select:none}
.variant.active{background:var(--ink);color:#fff;border-color:var(--ink)}

/* ── Цитата/факт ───────────────────── */
.quote{border-left:4px solid var(--accent-2);background:#fff;border-radius:0 14px 14px 0;padding:22px 26px;box-shadow:var(--shadow);font-size:17px;color:var(--ink-2)}
.quote b{color:var(--accent-deep)}

/* ── Шаги ──────────────────────────── */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:st}
@media(max-width:940px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.steps{grid-template-columns:1fr}}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;position:relative;box-shadow:var(--shadow)}
.step::before{counter-increment:st;content:counter(st,decimal-leading-zero);position:absolute;top:-16px;left:22px;background:var(--ink);color:#fff;font-weight:800;font-size:14px;border-radius:8px;padding:5px 12px;letter-spacing:1px}
.step h3{margin-top:10px;font-size:17.5px}
.step p{color:var(--mut);font-size:14.6px}

/* ── FAQ ───────────────────────────── */
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;box-shadow:var(--shadow);overflow:hidden}
.faq summary{cursor:pointer;padding:20px 24px;font-weight:700;font-size:16.5px;list-style:none;display:flex;justify-content:space-between;align-items:center;gap:14px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';font-size:24px;color:var(--accent);font-weight:400;flex:none}
.faq details[open] summary::after{content:'−'}
.faq details .a{padding:0 24px 22px;color:var(--mut);font-size:15.4px}

/* ── CTA-баннер ────────────────────── */
.cta-band{background:linear-gradient(135deg,var(--ink) 0%,#0f4c66 100%);color:#fff;border-radius:22px;padding:46px;display:grid;grid-template-columns:1.4fr .6fr;gap:30px;align-items:center}
@media(max-width:860px){.cta-band{grid-template-columns:1fr}}
.cta-band h2{font-size:clamp(24px,3vw,34px)}
.cta-band p{color:#c3d8e2;margin-top:12px;font-size:16.5px}

/* ── Футер ─────────────────────────── */
footer{background:var(--ink);color:#9fb9c6;padding:52px 0 34px;font-size:14.5px}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr;gap:34px}
@media(max-width:860px){.foot{grid-template-columns:1fr}}
footer h4{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.4px}
footer a{color:#cfe2ec;text-decoration:none}
footer a:hover{color:#fff}
.foot ul{list-style:none}
.foot li{margin-bottom:9px}
.foot .fine{margin-top:36px;padding-top:20px;border-top:1px solid #24404f;font-size:12.8px;color:#7d99a8;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

/* ── Появление при скролле ─────────── */
/* Фоллбэк: без JS (html без класса .js) контент виден сразу — сайт не может стать невидимым */
.rv{opacity:1;transform:none}
html.js .rv{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
html.js .rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){html.js .rv{opacity:1;transform:none;transition:none}.btn:hover{transform:none}.obj-card:hover .ph img{transform:none}}

/* ── Доступность ───────────────────── */
.btn:focus-visible,.nav a:focus-visible,.faq summary:focus-visible,.mnav summary:focus-visible,.variant:focus-visible{outline:3px solid var(--warm);outline-offset:2px}
section[id]{scroll-margin-top:84px}

/* ── Кнопка-акцент (светлые секции) ── */
.btn-accent{background:var(--accent);color:#fff;box-shadow:0 8px 24px rgba(15,127,168,.28)}
.btn-accent:hover{background:var(--accent-deep);color:#fff}

.breadcrumbs{font-size:13.5px;color:var(--mut);padding:18px 0 0}
.breadcrumbs a{color:var(--accent-deep);text-decoration:none}

/* ── Форма заявки (CTA) ── */
.leadform{margin-top:16px;display:flex;flex-direction:column;gap:10px;max-width:520px}
.lf-row{display:flex;gap:10px;flex-wrap:wrap}
.lf-row input{flex:1 1 150px;padding:13px 14px;border:0;border-radius:10px;font-size:16px;font-family:inherit;min-height:48px}
.lf-row input:focus{outline:3px solid var(--warm);outline-offset:1px}
.lf-hp{position:absolute;left:-5000px;top:-5000px;height:0;width:0;opacity:0}
.lf-btn{min-height:48px;font-size:15.5px}
.lf-note{font-size:12px;color:#c3d8e2;margin:0}
.lf-ok{font-size:14px;color:#aef0c4;font-weight:700;margin:0}
.lf-err{font-size:14px;color:#ffd2c9;font-weight:700;margin:0}
@media(max-width:920px){.leadform{max-width:none}}