/* pro100filament.ru — базовая тема. Одна таблица стилей, без фреймворков. */

:root{
  --ink:#14161a;
  --ink-2:#3d4450;
  --muted:#697280;
  --line:#e3e7ec;
  --line-2:#f0f2f5;
  --bg:#ffffff;
  --surface:#f6f8fa;
  --surface-2:#eef2f6;
  --brand:#ff5a1f;
  --brand-ink:#c8400d;
  --brand-soft:#fff2ec;
  --ok:#0f8a6d;
  --ok-soft:#e8f6f1;
  --dark:#101418;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 1px 2px rgba(16,20,24,.05), 0 8px 24px rgba(16,20,24,.06);
  --wrap:1160px;
  color-scheme: light;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font:400 17px/1.62 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  font-feature-settings:"kern" 1;
  -webkit-font-smoothing:antialiased;
}
img,svg{max-width:100%;height:auto;display:block}
a{color:var(--brand-ink);text-decoration:none}
a:hover{text-decoration:underline}
p{margin:0 0 1em}
ul,ol{margin:0 0 1em;padding-left:1.25em}
li{margin:.35em 0}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.2;letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(30px,4.4vw,46px)}
h2{font-size:clamp(24px,3vw,32px);margin-top:0}
h3{font-size:20px}
h4{font-size:17px}
small{font-size:14px}
hr{border:0;border-top:1px solid var(--line);margin:32px 0}
::selection{background:#ffd9c8}

.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.section{padding:56px 0}
.section--tight{padding:36px 0}
.section--surface{background:var(--surface);border-block:1px solid var(--line)}
.section--dark{background:var(--dark);color:#e8ecf1}
.section--dark h2,.section--dark h3{color:#fff}
.section--dark a{color:#ffb492}
.lead{font-size:19px;color:var(--ink-2);max-width:68ch}
.muted{color:var(--muted)}
.center{text-align:center}
.mw{max-width:74ch}
.mb0{margin-bottom:0}
.nowrap{white-space:nowrap}

/* ---------- header ---------- */
.top{background:var(--dark);color:#aab3bf;font-size:14px}
.top .wrap{display:flex;gap:18px;align-items:center;justify-content:space-between;min-height:38px;flex-wrap:wrap}
.top a{color:#cfd6de}
.top strong{color:#fff;font-weight:600}

.hdr{position:sticky;top:0;z-index:40;background:rgba(255,255,255,.94);backdrop-filter:saturate(1.4) blur(8px);border-bottom:1px solid var(--line)}
.hdr .wrap{display:flex;align-items:center;gap:20px;min-height:70px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;font-size:19px;letter-spacing:-.03em;text-decoration:none}
.logo:hover{text-decoration:none}
.logo b{color:var(--brand)}
.logo span{display:block;font-size:11px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:-2px}
.nav{display:flex;gap:2px;margin-left:auto;align-items:center}
.nav a{color:var(--ink-2);font-size:15px;font-weight:500;padding:8px 11px;border-radius:8px;text-decoration:none}
.nav a:hover{background:var(--surface-2);color:var(--ink)}
.nav a[aria-current="page"]{color:var(--brand-ink);background:var(--brand-soft)}
.hdr-cta{display:flex;align-items:center;gap:14px}
.hdr-tel{font-weight:700;font-size:17px;color:var(--ink);white-space:nowrap;text-decoration:none}
.hdr-tel:hover{text-decoration:none;color:var(--brand-ink)}
.burger{display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:10px;cursor:pointer;align-items:center;justify-content:center}
.burger span{display:block;width:18px;height:2px;background:var(--ink);position:relative}
.burger span::before,.burger span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink)}
.burger span::before{top:-6px}
.burger span::after{top:6px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 22px;border-radius:11px;font-size:16px;font-weight:600;border:1px solid transparent;cursor:pointer;text-decoration:none;transition:.15s ease;line-height:1.2}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn--primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(255,90,31,.28)}
.btn--primary:hover{background:#f04d12;color:#fff}
.btn--ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:#c9d0d8;color:var(--ink)}
.btn--dark{background:#fff;color:var(--dark)}
.btn--sm{padding:9px 16px;font-size:15px;border-radius:9px}
.btns{display:flex;gap:12px;flex-wrap:wrap;align-items:center}

/* ---------- hero ---------- */
.hero{padding:56px 0 44px;background:
  radial-gradient(900px 380px at 82% -10%,#fff1e9 0%,rgba(255,241,233,0) 65%),
  linear-gradient(180deg,#fbfcfd 0%,#fff 100%)}
.hero-grid{display:grid;gap:36px;align-items:center}
.hero h1{margin-bottom:.35em}
.hero .lead{font-size:20px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;background:var(--brand-soft);color:var(--brand-ink);font-size:13px;font-weight:600;padding:6px 12px;border-radius:100px;margin-bottom:18px;letter-spacing:.01em}
.hero-facts{display:flex;gap:28px;flex-wrap:wrap;margin-top:26px;padding-top:22px;border-top:1px solid var(--line)}
.hero-facts div{min-width:110px}
.hero-facts b{display:block;font-size:23px;letter-spacing:-.02em}
.hero-facts span{font-size:14px;color:var(--muted)}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:18px}
.grid--2{grid-template-columns:1fr}
.grid--3{grid-template-columns:1fr}
.grid--4{grid-template-columns:repeat(2,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{margin-bottom:.35em}
.card p:last-child{margin-bottom:0}
.card--link{transition:.16s ease;color:var(--ink)}
.card--link h3{color:var(--ink)}
.card--link:hover{text-decoration:none}
.card--link:hover{border-color:#d3dae2;box-shadow:var(--shadow);transform:translateY(-2px)}
.card--soft{background:var(--surface);border-color:transparent}
.card__tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.card__price{font-size:15px;font-weight:600;color:var(--brand-ink);margin-top:12px;display:block}
.num{display:flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:10px;background:var(--brand-soft);color:var(--brand-ink);font-weight:700;font-size:15px;margin-bottom:12px}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--ok);margin-right:7px;vertical-align:middle}
.chip{display:inline-block;background:var(--surface-2);border-radius:100px;padding:5px 12px;font-size:14px;color:var(--ink-2);margin:0 6px 8px 0}
.chip--ok{background:var(--ok-soft);color:var(--ok);font-weight:600}

/* ---------- tables ---------- */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{border-collapse:collapse;width:100%;font-size:16px;min-width:520px}
th,td{padding:13px 16px;text-align:left;border-bottom:1px solid var(--line-2)}
thead th{background:var(--surface);font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);font-weight:700;white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
tbody tr:hover{background:#fcfdfe}
td b{font-weight:700}
.tbl-note{font-size:14px;color:var(--muted);margin-top:10px}

/* ---------- price / calculator ---------- */
.calc{display:grid;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow)}
.calc__in{padding:24px}
.calc__out{padding:24px;background:var(--dark);color:#fff;display:flex;flex-direction:column;justify-content:center}
.calc__out .big{font-size:40px;font-weight:800;letter-spacing:-.03em;line-height:1.1;color:#fff}
.calc__out .sub{color:#9aa5b2;font-size:14px;margin-top:4px}
.calc__row{display:flex;justify-content:space-between;gap:12px;padding:10px 0;border-bottom:1px solid rgba(255,255,255,.1);font-size:15px;color:#cbd3dc}
.calc__row b{color:#fff}
.calc label{display:block;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:0 0 8px}
.seg{display:flex;gap:6px;background:var(--surface-2);padding:4px;border-radius:11px;margin-bottom:18px}
.seg button{flex:1;padding:9px 8px;border:0;background:transparent;border-radius:8px;font:inherit;font-size:15px;font-weight:600;color:var(--ink-2);cursor:pointer}
.seg button[aria-pressed="true"]{background:#fff;color:var(--ink);box-shadow:0 1px 3px rgba(0,0,0,.12)}
input[type=range]{width:100%;accent-color:var(--brand);height:28px}
.calc__kg{display:flex;align-items:baseline;gap:8px;margin-bottom:2px}
.calc__kg b{font-size:26px;letter-spacing:-.02em}
.ticks{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:-4px}

/* ---------- steps / features ---------- */
.steps{counter-reset:s;display:grid;gap:16px}
.step{display:flex;gap:16px;align-items:flex-start}
.step__n{flex:0 0 auto;width:32px;height:32px;border-radius:50%;background:var(--dark);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px}
.step h3{font-size:18px;margin-bottom:.2em}
.step p{margin:0;color:var(--ink-2);font-size:16px}

.list-check{list-style:none;padding:0;margin:0}
.list-check li{position:relative;padding-left:30px;margin:.6em 0}
.list-check li::before{content:"";position:absolute;left:4px;top:.55em;width:9px;height:5px;border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);transform:rotate(-45deg)}

/* ---------- colors swatches ---------- */
.swatches{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.sw{width:38px;height:38px;border-radius:50%;border:1px solid rgba(0,0,0,.12);box-shadow:inset 0 -6px 12px rgba(0,0,0,.08)}

/* ---------- callout ---------- */
.note{border-left:3px solid var(--brand);background:var(--brand-soft);padding:16px 18px;border-radius:0 var(--radius-sm) var(--radius-sm) 0;font-size:16px}
.note--n{border-left-color:#9aa5b2;background:var(--surface)}
.note p:last-child{margin-bottom:0}

/* ---------- faq ---------- */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;padding:18px 40px 18px 0;font-weight:600;font-size:17px;list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:8px;top:14px;font-size:24px;font-weight:400;color:var(--brand);line-height:1}
.faq details[open] summary::after{content:"–"}
.faq details > div{padding:0 40px 18px 0;color:var(--ink-2)}
.faq details > div p:last-child{margin-bottom:0}

/* ---------- form ---------- */
.form{display:grid;gap:14px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px;color:var(--ink-2)}
.field input,.field textarea,.field select{width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:11px;font:inherit;font-size:16px;background:#fff;color:var(--ink)}
.field input:focus,.field textarea:focus,.field select:focus{outline:2px solid var(--brand);outline-offset:1px;border-color:transparent}
.field textarea{min-height:104px;resize:vertical}
.form__row{display:grid;gap:14px;grid-template-columns:1fr}
.form small{color:var(--muted);font-size:13px;display:block}
.form-ok{background:var(--ok-soft);color:var(--ok);border-radius:var(--radius-sm);padding:14px 16px;font-weight:600;display:none}

/* ---------- breadcrumbs ---------- */
.crumbs{font-size:14px;color:var(--muted);padding:16px 0 0}
.crumbs a{color:var(--muted)}
.crumbs span{margin:0 6px;opacity:.5}

/* ---------- footer ---------- */
.ftr{background:var(--dark);color:#9aa5b2;font-size:15px;padding:48px 0 28px;margin-top:8px}
.ftr h4{color:#fff;font-size:14px;text-transform:uppercase;letter-spacing:.07em;margin-bottom:14px}
.ftr a{color:#c3ccd6;text-decoration:none}
.ftr a:hover{color:#fff;text-decoration:underline}
.ftr-grid{display:grid;gap:28px;grid-template-columns:1fr 1fr}
.ftr ul{list-style:none;padding:0;margin:0}
.ftr li{margin:.45em 0}
.ftr-bot{border-top:1px solid rgba(255,255,255,.1);margin-top:32px;padding-top:20px;display:flex;gap:16px;justify-content:space-between;flex-wrap:wrap;font-size:13px;color:#6f7a87}
.ftr-tel{font-size:22px;font-weight:700;color:#fff;display:block;margin-bottom:4px}
.ftr-tel:hover{color:#fff}

/* ---------- misc ---------- */
.cta-band{background:linear-gradient(135deg,#1b2027 0%,#101418 100%);color:#fff;border-radius:var(--radius);padding:32px;display:grid;gap:20px}
.cta-band h2{color:#fff;margin-bottom:.3em}
.cta-band p{color:#b9c2cc;margin-bottom:0}
.geo{display:flex;flex-wrap:wrap;gap:8px}
.geo a{background:#fff;border:1px solid var(--line);border-radius:100px;padding:7px 14px;font-size:15px;color:var(--ink-2);text-decoration:none}
.geo a:hover{border-color:var(--brand);color:var(--brand-ink);text-decoration:none}
.spool{width:100%;max-width:420px;margin:0 auto}

@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,1fr)}
  .grid--3{grid-template-columns:repeat(3,1fr)}
  .grid--4{grid-template-columns:repeat(4,1fr)}
  .form__row{grid-template-columns:1fr 1fr}
  .calc{grid-template-columns:1.15fr .85fr}
  .calc__in,.calc__out{padding:30px}
  .ftr-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr}
  .cta-band{grid-template-columns:1.6fr auto;align-items:center;padding:40px}
  .section{padding:72px 0}
  .section--tight{padding:40px 0}
}
@media (min-width:1000px){
  .hero-grid{grid-template-columns:1.15fr .85fr;gap:48px}
  .hero{padding:72px 0 60px}
}
@media (max-width:719px){
  .top .wrap span:first-child{display:none}
  .top .wrap{justify-content:flex-end}
}
@media (max-width:899px){
  .nav{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:10px;gap:2px;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .nav a{padding:12px 14px;font-size:16px}
  .hdr-cta .btn{display:none}
  .burger{display:flex}
  .hdr .wrap{position:relative}
  .hdr-tel{font-size:15px}
}
@media print{.hdr,.ftr,.top,.btn{display:none}}