/* ============================================================
   ТеплоРубеж — блочно-модульные котельные
   Тема «мороз-тепло»: холодный сине-графитовый фон + тёплый
   кирпично-оранжевый акцент. Все шрифты self-host (woff2).
   ============================================================ */

/* --- Self-hosted fonts (положить .woff2 в /fonts/) ---------- */
@font-face{
  font-family:'Plex Sans';
  src:url('/fonts/IBMPlexSans-Regular.woff2') format('woff2');
  font-weight:400; font-style:normal; font-display:swap;
}
@font-face{
  font-family:'Plex Sans';
  src:url('/fonts/IBMPlexSans-Medium.woff2') format('woff2');
  font-weight:500; font-style:normal; font-display:swap;
}
@font-face{
  font-family:'Plex Sans';
  src:url('/fonts/IBMPlexSans-SemiBold.woff2') format('woff2');
  font-weight:600; font-style:normal; font-display:swap;
}
@font-face{
  font-family:'Plex Cond';
  src:url('/fonts/IBMPlexSansCondensed-SemiBold.woff2') format('woff2');
  font-weight:600; font-style:normal; font-display:swap;
}
@font-face{
  font-family:'Plex Cond';
  src:url('/fonts/IBMPlexSansCondensed-Bold.woff2') format('woff2');
  font-weight:700; font-style:normal; font-display:swap;
}
@font-face{
  font-family:'Plex Mono';
  src:url('/fonts/IBMPlexMono-Medium.woff2') format('woff2');
  font-weight:500; font-style:normal; font-display:swap;
}

:root{
  --bg:#141B22;
  --bg-2:#1C2630;
  --card:#202B35;
  --raised:#26333E;
  --border:#2E3A45;
  --text:#E8EEF2;
  --muted:#9DB0BE;
  --accent:#C2410C;      /* CTA */
  --accent-hover:#EA580C;
  --heat:#F97316;        /* яркие иконки тепла (скупо) */
  --cold:#5EA8C7;        /* инфо-ссылки, пар/иней (скупо) */
  --valid:#10B981;
  --on-accent:#FFFFFF;

  --font-body:'Plex Sans', system-ui, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-head:'Plex Cond', 'Plex Sans', system-ui, sans-serif;
  --font-mono:'Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;

  --wrap:1180px;
  --radius:10px;
  --radius-sm:7px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.6;
  color:var(--text);
  background:var(--bg);
  background-image:linear-gradient(160deg,#141B22 0%,#1C2630 100%);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:700;line-height:1.08;letter-spacing:-.01em;margin:0 0 .4em}
h1{font-size:clamp(30px,4.6vw,56px)}
h2{font-size:clamp(25px,3vw,38px)}
h3{font-size:clamp(20px,2vw,24px)}
p{margin:0 0 1em;text-wrap:pretty}
a{color:var(--cold);text-decoration:none}
a:hover{color:#8ac6de;text-decoration:underline}
ul,ol{margin:0 0 1em;padding-left:1.2em}
li{margin:.25em 0}
strong{font-weight:600;color:var(--text)}
code,.mono{font-family:var(--font-mono)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
section{padding:64px 0}
.eyebrow{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--cold);margin:0 0 14px}
.lead{font-size:19px;color:var(--muted)}
.muted{color:var(--muted)}
.center{text-align:center}

/* --- Buttons ------------------------------------------------ */
.btn{
  display:inline-flex;align-items:center;gap:.5em;
  font-family:var(--font-head);font-weight:700;font-size:17px;letter-spacing:.01em;
  padding:14px 24px;border-radius:var(--radius-sm);
  border:1px solid transparent;cursor:pointer;text-decoration:none;
  transition:background .15s ease,border-color .15s ease,color .15s ease;
}
.btn-primary{background:var(--accent);color:var(--on-accent)}
.btn-primary:hover{background:var(--accent-hover);color:#fff;text-decoration:none}
.btn-ghost{background:transparent;color:var(--text);border-color:var(--border)}
.btn-ghost:hover{border-color:var(--cold);color:var(--text);text-decoration:none}
.btn-lg{padding:17px 30px;font-size:19px}
.btn-block{display:flex;width:100%;justify-content:center}

/* --- Header ------------------------------------------------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(20,27,34,.86);backdrop-filter:blur(9px);
  border-bottom:1px solid var(--border);
}
.hdr{display:flex;align-items:center;gap:24px;height:70px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--font-head);font-weight:700;font-size:22px;color:var(--text)}
.brand:hover{text-decoration:none;color:var(--text)}
.brand .mark{width:26px;height:26px;flex:0 0 auto}
.brand b{color:var(--heat)}
.nav{display:flex;gap:22px;margin-left:8px}
.nav a{color:var(--muted);font-size:15.5px;font-weight:500}
.nav a:hover{color:var(--text);text-decoration:none}
.hdr-right{margin-left:auto;display:flex;align-items:center;gap:18px}
.hdr-phone{font-family:var(--font-mono);font-size:16px;color:var(--text);white-space:nowrap}
.hdr-phone:hover{color:var(--heat);text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid var(--border);border-radius:6px;color:var(--text);width:42px;height:38px;cursor:pointer}

/* --- Hero --------------------------------------------------- */
.hero{padding:56px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero h1{margin-bottom:20px}
.hero .catalog{font-size:17px;color:var(--muted);margin:0 0 22px}
.hero .catalog a{color:var(--text);border-bottom:1px solid var(--border)}
.hero .catalog a:hover{color:var(--heat);border-color:var(--heat);text-decoration:none}
.offer{display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-left:3px solid var(--heat);border-radius:var(--radius-sm);padding:14px 16px;margin:0 0 18px}
.offer .ic{color:var(--heat);flex:0 0 auto;margin-top:2px}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
.hero-art{position:relative;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:linear-gradient(180deg,#18222b,#101720)}

/* --- Stats bar ---------------------------------------------- */
.stats{border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:rgba(32,43,53,.4)}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;padding:0}
.stat{padding:26px 24px}
.stat .num{font-family:var(--font-mono);font-weight:500;font-size:clamp(26px,3vw,34px);color:var(--text);line-height:1}
.stat .num .u{color:var(--heat);font-size:.6em;margin-left:.15em}
.stat .lbl{color:var(--muted);font-size:14px;margin-top:8px}

/* --- Grid / cards ------------------------------------------- */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column}
a.card{color:var(--text)}
a.card:hover{border-color:var(--cold);text-decoration:none;background:var(--raised)}
.card h3{margin-bottom:8px}
.card .meta{font-family:var(--font-mono);font-size:13px;color:var(--cold);margin-bottom:12px;letter-spacing:.04em}
.card p{color:var(--muted);font-size:15.5px;margin:0}
.card .foot{margin-top:auto;padding-top:16px;color:var(--heat);font-weight:600;font-size:15px}
.tag{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.05em;color:var(--muted);border:1px solid var(--border);border-radius:99px;padding:4px 11px}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 8px}

/* --- Section heading --------------------------------------- */
.sec-head{max-width:760px;margin:0 0 36px}
.sec-head.center{margin-left:auto;margin-right:auto}

/* --- Breadcrumbs -------------------------------------------- */
.crumbs{padding:18px 0 0;font-size:13.5px;font-family:var(--font-mono);color:var(--muted)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:7px;padding:0;margin:0}
.crumbs li::after{content:'/';margin-left:7px;color:var(--border)}
.crumbs li:last-child::after{content:''}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--cold)}
.crumbs li[aria-current]{color:var(--text)}

/* --- Prose / article --------------------------------------- */
.prose{max-width:760px}
.prose h2{margin-top:1.4em}
.prose h3{margin-top:1.2em;font-family:var(--font-head)}
.prose .answer{font-size:19px;color:var(--text);border-left:3px solid var(--heat);background:var(--card);padding:18px 20px;border-radius:var(--radius-sm);margin:0 0 28px}
.prose figure{margin:28px 0}
.prose figcaption{font-size:13.5px;color:var(--muted);font-family:var(--font-mono);margin-top:8px}

/* --- Spec table (ТТХ) --------------------------------------- */
.spec{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
.spec th,.spec td{text-align:left;padding:14px 18px;border-bottom:1px solid var(--border);font-size:15.5px;vertical-align:top}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:0}
.spec th{width:44%;color:var(--muted);font-weight:500}
.spec td{color:var(--text);font-family:var(--font-mono)}
.fillme{color:var(--cold);font-family:var(--font-mono)}
.fillme::before{content:'{';opacity:.5}
.fillme::after{content:'}';opacity:.5}

/* --- Callout / note ----------------------------------------- */
.note{background:var(--raised);border:1px solid var(--border);border-radius:var(--radius);padding:20px 22px}
.note.cold{border-left:3px solid var(--cold)}
.note.heat{border-left:3px solid var(--heat)}
.note h3{margin-top:0}
.note p:last-child{margin-bottom:0}

/* --- FAQ ---------------------------------------------------- */
.faq{border-top:1px solid var(--border)}
.faq details{border-bottom:1px solid var(--border);padding:6px 0}
.faq summary{cursor:pointer;font-family:var(--font-head);font-weight:600;font-size:19px;padding:14px 0;list-style:none;color:var(--text)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:'+';color:var(--heat);font-family:var(--font-mono);margin-right:12px}
.faq details[open] summary::before{content:'\2212'}
.faq details p{color:var(--muted);padding:0 0 12px 28px;margin:0}

/* --- Form --------------------------------------------------- */
.form-wrap{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px}
.form-intro{color:var(--muted);margin-bottom:22px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;color:var(--muted);margin-bottom:6px}
.field label .req{color:var(--heat)}
.field input,.field select,.field textarea{
  width:100%;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text);font-family:var(--font-body);font-size:16px;padding:12px 14px;
}
.field textarea{min-height:96px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--cold)}
.field input:valid:not(:placeholder-shown){border-color:var(--valid)}
.field .hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
.consent{display:flex;gap:11px;align-items:flex-start;font-size:13.5px;color:var(--muted);margin:6px 0 20px}
.consent input{width:18px;height:18px;margin-top:2px;flex:0 0 auto}
.form-note{font-size:12.5px;color:var(--muted);font-family:var(--font-mono);margin-top:14px}
.radio-row{display:flex;flex-wrap:wrap;gap:8px 16px;padding-top:4px}
.radio{display:flex;align-items:center;gap:7px;font-size:14px;color:var(--text);cursor:pointer}
.radio input{width:17px;height:17px;flex:0 0 auto;margin:0}
.check-inline{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--text);margin:0 0 18px;cursor:pointer}
.check-inline input{width:18px;height:18px;margin-top:2px;flex:0 0 auto}
.facts{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 8px;list-style:none;padding:0}
.facts li{font-family:var(--font-mono);font-size:13px;color:var(--muted);border:1px solid var(--border);border-radius:99px;padding:6px 13px}
.facts li b{color:var(--heat);font-weight:500}

/* --- CTA band ----------------------------------------------- */
.band{background:var(--card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.band .wrap{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}

/* --- Footer ------------------------------------------------- */
.site-footer{border-top:1px solid var(--border);background:#111820;padding:56px 0 32px;color:var(--muted);font-size:14.5px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:36px}
.site-footer .foot-h{font-family:var(--font-head);font-weight:700;color:var(--text);font-size:16px;margin:0 0 14px;letter-spacing:.02em}
.site-footer a{color:var(--muted);display:block;margin:6px 0}
.site-footer a:hover{color:var(--cold)}
.legal{border-top:1px solid var(--border);padding-top:24px;font-size:12.5px;line-height:1.7;color:#7d909e}
.legal p{margin:0 0 8px}
.reqs{font-family:var(--font-mono);font-size:12.5px}

/* --- Cookie banner ------------------------------------------ */
.cookie{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:100;
  max-width:720px;margin:0 auto;background:var(--raised);border:1px solid var(--border);
  border-radius:var(--radius);padding:18px 20px;display:none;
  box-shadow:0 12px 40px rgba(0,0,0,.5);
}
.cookie.show{display:flex;gap:18px;align-items:center;flex-wrap:wrap}
.cookie p{margin:0;font-size:14px;color:var(--muted);flex:1 1 320px}

/* --- Responsive --------------------------------------------- */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:32px}
  .stats .wrap{grid-template-columns:repeat(2,1fr)}
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav,.hdr-phone{display:none}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center}
  .site-header.open .nav{display:flex;position:absolute;top:70px;left:0;right:0;flex-direction:column;background:var(--bg-2);border-bottom:1px solid var(--border);padding:16px 24px;gap:14px}
}
@media(max-width:640px){
  section{padding:44px 0}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .stats .wrap{grid-template-columns:1fr 1fr}
  .foot-grid{grid-template-columns:1fr}
  .band .wrap{flex-direction:column;align-items:flex-start}
}

/* --- Hero SVG animation (no JS) ----------------------------- */
.kot-flame{transform-origin:center bottom;animation:flame 1.5s ease-in-out infinite alternate}
.kot-flame-inner{transform-origin:center bottom;animation:flame 1.1s ease-in-out infinite alternate}
.kot-glow{animation:glow 3s ease-in-out infinite alternate}
.kot-heatline{stroke-dasharray:6 10;animation:heatflow 2.4s linear infinite}
.frost{animation:frostdrift linear infinite}
.frost:nth-child(2n){animation-duration:9s}
.frost:nth-child(3n){animation-duration:13s}
@keyframes flame{from{transform:scaleY(.86) scaleX(1.04)}to{transform:scaleY(1.08) scaleX(.94)}}
@keyframes glow{from{opacity:.35}to{opacity:.85}}
@keyframes heatflow{to{stroke-dashoffset:-32}}
@keyframes frostdrift{0%{transform:translateY(-6px);opacity:0}15%{opacity:.7}100%{transform:translateY(230px);opacity:0}}
.frost:nth-child(1){animation-delay:0s}
.frost:nth-child(2){animation-delay:-2.4s}
.frost:nth-child(3){animation-delay:-4.1s}
.frost:nth-child(4){animation-delay:-6.2s}
.frost:nth-child(5){animation-delay:-1.3s}
.frost:nth-child(6){animation-delay:-8s}
.frost:nth-child(7){animation-delay:-3.3s}
.frost:nth-child(8){animation-delay:-5.5s}
@media(prefers-reduced-motion:reduce){
  .kot-flame,.kot-flame-inner,.kot-glow,.kot-heatline,.frost{animation:none}
  html{scroll-behavior:auto}
}

/* --- Utility (нет инлайновых style: их блокирует CSP style-src) --- */
.ym-pixel{position:absolute;left:-9999px}
.hero-svg{display:block;width:100%;height:auto}
.mt-0{margin-top:0}
.mb-0{margin-bottom:0}
.narrow{max-width:820px}
.pt-tight{padding-top:34px}
.two-col-text{columns:2;column-gap:40px}
@media(max-width:640px){.two-col-text{columns:1}}
.ext::after{content:'\2197';font-family:var(--font-mono);margin-left:.25em;color:var(--cold)}
.pill-list{display:flex;flex-wrap:wrap;gap:10px;list-style:none;padding:0;margin:0 0 8px}
.pill-list a{display:inline-block;font-family:var(--font-mono);font-size:13px;color:var(--text);border:1px solid var(--border);border-radius:99px;padding:7px 14px}
.pill-list a:hover{border-color:var(--heat);color:var(--heat);text-decoration:none}
.link-list{list-style:none;padding:0;margin:0}
.link-list li{border-bottom:1px solid var(--border)}
.link-list a{display:flex;justify-content:space-between;gap:16px;padding:16px 2px;color:var(--text)}
.link-list a:hover{color:var(--heat);text-decoration:none}
.link-list .k{font-family:var(--font-mono);font-size:13px;color:var(--muted)}
.icon-heat{color:var(--heat)}
.icon-cold{color:var(--cold)}

/* --- Hero chart «Ровная линия тепла» ------------------------ */
@keyframes draw{to{stroke-dashoffset:0}}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(1.55);opacity:.5}}
@keyframes gapfade{0%,60%{opacity:0}100%{opacity:.9}}
.line-draw{stroke-dasharray:100;stroke-dashoffset:100;animation:draw 2.1s ease forwards}
.cold-delay{animation-delay:.4s}
.warm-halo{animation:glow 3.2s ease-in-out infinite alternate}
.warm-dot{transform-box:fill-box;transform-origin:center;animation:pulse 1.9s ease-in-out infinite}
.gap-line{opacity:0;animation:gapfade 2.6s ease forwards}
@media(prefers-reduced-motion:reduce){
  .line-draw{animation:none;stroke-dashoffset:0}
  .warm-halo,.warm-dot,.gap-line{animation:none}
  .gap-line{opacity:.9}
}

/* --- блок «География» (генератор ТеплоРубеж, орфан-фикс) --- */
.geo-links{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}
.geo-links a{display:inline-block;padding:8px 14px;border:1px solid #2E3A45;border-radius:8px;
  background:#202B35;color:#cdd5dd;text-decoration:none;font-size:15px;transition:border-color .15s,color .15s}
.geo-links a:hover{border-color:#F97316;color:#fff}

/* --- плашка «в разработке» (генератор ТеплоРубеж) --- */
.dev-banner{position:sticky;top:0;z-index:200;background:#7c2d12;color:#fde68a;
  text-align:center;font-size:14px;line-height:1.3;padding:8px 14px;
  border-bottom:1px solid #F97316;letter-spacing:.01em}
@media(max-width:560px){.dev-banner{font-size:12.5px;padding:7px 10px}}