/* ==========================================================================
   ТЕХВОДПОЛИМЕР — Песколовки. Премиальный промышленный дизайн.
   ========================================================================== */

:root{
  --bg-0: #0f1210;
  --bg-1: #161b18;
  --bg-2: #1d2420;
  --steel: #2a322d;
  --line: rgba(255,255,255,0.08);
  --text-0: #eef0ee;
  --text-1: #b7bdb8;
  --text-2: #7f887f;
  --accent: #1A4D2E;
  --accent-light: #8BC34A;
  --accent-glow: rgba(139,195,74,0.25);
  --warn: #c96a4a;
  --radius: 14px;
  --radius-sm: 8px;
  --font-display: 'Unbounded', sans-serif;
  --font-body: 'Manrope', sans-serif;
  --container: 1240px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-0);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;margin:0 0 .5em;line-height:1.2;}
p{margin:0 0 1em;color:var(--text-1);}

.container{max-width:var(--container);margin:0 auto;padding:0 24px;}

.eyebrow{
  color:var(--accent-light);
  font-size:13px;
  letter-spacing:.14em;
  text-transform:uppercase;
  font-weight:700;
  margin:0 0 12px;
}

.section{padding:96px 0;position:relative;}
.section__title{font-size:clamp(28px,3.4vw,42px);max-width:820px;}
.section__lead{max-width:680px;font-size:18px;}

/* Buttons */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:14px 26px;border-radius:999px;
  font-family:var(--font-body);font-weight:700;font-size:15px;
  border:1px solid transparent;cursor:pointer;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
  white-space:nowrap;
}
.btn--accent{background:linear-gradient(135deg,var(--accent-light),#6a9c3b);color:#0f1210;box-shadow:0 8px 24px var(--accent-glow);}
.btn--accent:hover{transform:translateY(-2px);box-shadow:0 12px 32px var(--accent-glow);}
.btn--outline{border-color:var(--line);color:var(--text-0);background:rgba(255,255,255,0.03);}
.btn--outline:hover{border-color:var(--accent-light);color:var(--accent-light);}
.btn--ghost{background:transparent;color:var(--text-1);border-color:var(--line);}
.btn--ghost:hover{color:var(--text-0);}
.btn--sm{padding:10px 18px;font-size:13px;}
.btn--block{width:100%;}

/* Cookie banner */
.cookie-banner{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:999;
  background:rgba(22,27,24,0.92);backdrop-filter:blur(12px);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:16px 20px;max-width:900px;margin:0 auto;
  display:none;
}
.cookie-banner.is-visible{display:block;}
.cookie-banner__inner{display:flex;gap:16px;align-items:center;flex-wrap:wrap;}
.cookie-banner p{margin:0;font-size:13px;color:var(--text-1);flex:1;min-width:220px;}
.cookie-banner a{color:var(--accent-light);text-decoration:underline;}

/* Header */
.site-header{
  position:sticky;top:0;z-index:200;
  background:rgba(15,18,16,0.75);backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.site-header__inner{display:flex;align-items:center;gap:32px;height:76px;}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;}
.logo__mark{
  width:38px;height:38px;border-radius:8px;
  background:linear-gradient(135deg,var(--accent-light),var(--accent));
  color:#0f1210;display:flex;align-items:center;justify-content:center;font-size:13px;
}
.logo__text{font-size:14px;letter-spacing:.03em;}
.main-nav{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--text-1);}
.main-nav a:hover{color:var(--accent-light);}
.site-header .btn{margin-left:8px;}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;margin-left:8px;}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--text-0);margin:5px 0;}

/* Breadcrumbs */
.breadcrumbs{padding:14px 24px;font-size:12px;color:var(--text-2);display:flex;gap:8px;align-items:center;}
.breadcrumbs a{color:var(--text-2);}
.breadcrumbs a:hover{color:var(--accent-light);}

/* Hero */
.hero{position:relative;padding:100px 0 80px;overflow:hidden;}
.hero__bg{position:absolute;inset:0;z-index:0;}
.hero__grid{
  position:absolute;inset:0;
  background-image:linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse at 50% 30%, black 0%, transparent 70%);
  opacity:.6;
}
.hero__glow{
  position:absolute;top:-200px;left:50%;transform:translateX(-50%);
  width:900px;height:600px;
  background:radial-gradient(circle, var(--accent-glow) 0%, transparent 65%);
  filter:blur(20px);
}
.hero__inner{position:relative;z-index:1;text-align:center;display:flex;flex-direction:column;align-items:center;}
.hero__title{font-size:clamp(36px,6vw,64px);max-width:900px;}
.hero__title span{color:var(--accent-light);}
.hero__lead{max-width:640px;font-size:18px;color:var(--text-1);}
.hero__cta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center;margin:28px 0 48px;}
.hero__stats{display:flex;gap:40px;flex-wrap:wrap;justify-content:center;padding-top:32px;border-top:1px solid var(--line);width:100%;max-width:820px;}
.hero__stats li{display:flex;flex-direction:column;align-items:center;gap:4px;}
.hero__stats strong{font-family:var(--font-display);font-size:24px;color:var(--accent-light);}
.hero__stats span{font-size:12px;color:var(--text-2);}
.hero__scroll{
  position:relative;z-index:1;margin-top:60px;display:flex;flex-direction:column;align-items:center;
  gap:8px;font-size:11px;color:var(--text-2);text-transform:uppercase;letter-spacing:.1em;
}
.hero__scroll span{width:1px;height:36px;background:linear-gradient(var(--accent-light), transparent);animation:scrollPulse 2s infinite;}
@keyframes scrollPulse{0%,100%{opacity:.2;}50%{opacity:1;}}

/* Cards grid */
.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px;}
.cards-grid--3{margin-top:0;}
.card{
  background:linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.01));
  border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;backdrop-filter:blur(8px);
  transition:transform .3s ease, border-color .3s ease;
}
.card:hover{transform:translateY(-4px);border-color:rgba(139,195,74,0.35);}
.card--warn{border-left:3px solid var(--warn);}
.card h3{font-size:18px;}
.card__icon{width:44px;height:44px;border-radius:10px;background:rgba(139,195,74,0.12);margin-bottom:16px;position:relative;}
.card__icon::after{
  content:'';position:absolute;inset:12px;border:2px solid var(--accent-light);border-radius:4px;
}

/* Type tabs */
.type-tabs{display:flex;gap:10px;margin:40px 0 32px;}
.type-tabs__btn{
  background:rgba(255,255,255,0.03);border:1px solid var(--line);color:var(--text-1);
  padding:12px 24px;border-radius:999px;cursor:pointer;font-weight:700;font-size:14px;font-family:var(--font-body);
  transition:all .25s ease;
}
.type-tabs__btn.is-active{background:var(--accent-light);color:#0f1210;border-color:var(--accent-light);}
.type-panel{display:none;}
.type-panel.is-active{display:block;animation:fadeUp .5s ease both;}
@keyframes fadeUp{from{opacity:0;transform:translateY(16px);}to{opacity:1;transform:translateY(0);}}
.type-panel__grid{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center;}
.type-panel__visual{
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
}
.scheme-svg{width:100%;height:auto;}
.check-list li, .cross-list li{position:relative;padding-left:26px;margin-bottom:10px;color:var(--text-1);}
.check-list li::before{content:'✓';position:absolute;left:0;color:var(--accent-light);font-weight:700;}
.cross-list li::before{content:'–';position:absolute;left:0;color:var(--warn);font-weight:700;}

/* vortex spin animation */
.vortex-spin{animation:spin 6s linear infinite;}
@keyframes spin{from{transform:rotate(0deg);}to{transform:rotate(360deg);}}
.flow-lines line{animation:flowDash 3s linear infinite;}
@keyframes flowDash{to{stroke-dashoffset:-100;}}
.sand-particles circle{animation:fall 2.4s ease-in infinite;}
.sand-particles circle:nth-child(2){animation-delay:.4s;}
.sand-particles circle:nth-child(3){animation-delay:.8s;}
.sand-particles circle:nth-child(4){animation-delay:1.2s;}
.sand-particles circle:nth-child(5){animation-delay:1.6s;}
@keyframes fall{0%{opacity:0;transform:translateY(-10px);}30%{opacity:1;}100%{transform:translateY(115px);opacity:0;}}

/* Compare table */
.compare-table-wrap{margin-top:64px;}
.compare-table, .specs-table{width:100%;border-collapse:collapse;font-size:14px;}
.compare-table th, .specs-table th{
  text-align:left;padding:14px 16px;background:var(--bg-2);color:var(--accent-light);
  font-size:12px;text-transform:uppercase;letter-spacing:.05em;border-bottom:1px solid var(--line);
}
.compare-table td, .specs-table td{padding:14px 16px;border-bottom:1px solid var(--line);color:var(--text-1);}
.compare-table tr:hover td, .specs-table tr:hover td{background:rgba(139,195,74,0.04);}
.table-scroll{overflow-x:auto;}
.specs-note{margin-top:16px;font-size:13px;color:var(--text-2);}

/* Steps */
.steps-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px;}
.step{padding:24px;border-left:2px solid var(--accent-light);}
.step__num{font-family:var(--font-display);font-size:32px;color:var(--accent-light);opacity:.4;}
.step h3{margin-top:8px;font-size:17px;}

/* Construction */
.construction-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px;}
.construction-item{padding:20px 0;border-top:1px solid var(--line);}
.construction-item h4{color:var(--accent-light);font-size:15px;}

/* Calculator */
.calc-box{
  display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:24px;align-items:end;
  background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius);padding:32px;margin-top:40px;
}
.calc-box__field label{display:block;font-size:13px;color:var(--text-2);margin-bottom:8px;}
.calc-box__field select, .calc-box__field input[type=range]{
  width:100%;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  color:var(--text-0);padding:10px;font-family:var(--font-body);
}
.calc-box__result{display:flex;flex-direction:column;gap:8px;align-items:flex-start;}
.calc-box__result span{font-size:12px;color:var(--text-2);}
.calc-box__result strong{font-family:var(--font-display);font-size:22px;color:var(--accent-light);}

/* Process line */
.process-line{display:grid;grid-template-columns:repeat(6,1fr);gap:16px;margin-top:48px;}
.process-item{text-align:center;padding:20px 12px;border:1px solid var(--line);border-radius:var(--radius-sm);}
.process-item span{
  display:inline-flex;width:32px;height:32px;border-radius:50%;background:var(--accent-light);color:#0f1210;
  align-items:center;justify-content:center;font-weight:700;margin-bottom:12px;font-size:14px;
}
.process-item h4{font-size:14px;}
.process-item p{font-size:12px;}

/* FAQ */
.faq-list{margin-top:40px;border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item__q{
  width:100%;text-align:left;background:none;border:none;color:var(--text-0);
  padding:20px 0;display:flex;justify-content:space-between;align-items:center;
  cursor:pointer;font-family:var(--font-body);font-size:16px;font-weight:600;
}
.faq-item__icon{width:20px;height:20px;position:relative;flex-shrink:0;}
.faq-item__icon::before, .faq-item__icon::after{content:'';position:absolute;background:var(--accent-light);}
.faq-item__icon::before{width:100%;height:2px;top:50%;left:0;transform:translateY(-50%);}
.faq-item__icon::after{height:100%;width:2px;left:50%;top:0;transform:translateX(-50%);transition:transform .3s ease;}
.faq-item__q[aria-expanded="true"] .faq-item__icon::after{transform:translateX(-50%) scaleY(0);}
.faq-item__a{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.faq-item__a p{padding-bottom:20px;margin:0;}

/* Articles */
.articles-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px;}
.article-card{
  display:block;padding:24px;border:1px solid var(--line);border-radius:var(--radius);
  transition:border-color .25s ease, transform .25s ease;
}
.article-card:hover{border-color:var(--accent-light);transform:translateY(-3px);}
.article-card h4{font-size:16px;color:var(--text-0);}
.article-card p{font-size:13px;margin:0;}

/* Reviews */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px;}
.review-card{background:var(--bg-1);border:1px solid var(--line);border-radius:var(--radius);padding:26px;}
.review-card p{font-style:italic;color:var(--text-0);}
.review-card span{font-size:12px;color:var(--text-2);}

/* Lead form */
.lead-form{background:var(--bg-1);}
.lead-form__inner{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:start;}
.form{display:flex;flex-direction:column;gap:16px;}
.form__row label{display:block;font-size:13px;color:var(--text-2);margin-bottom:6px;}
.form__row input[type=text], .form__row input[type=tel], .form__row input[type=email], .form__row textarea{
  width:100%;background:var(--bg-2);border:1px solid var(--line);border-radius:var(--radius-sm);
  color:var(--text-0);padding:12px 14px;font-family:var(--font-body);font-size:14px;
}
.form__row textarea{resize:vertical;}
.file-label{
  display:flex;justify-content:space-between;align-items:center;border:1px dashed var(--line);
  padding:12px 14px;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;color:var(--text-2);
}
.form__row--checkbox{display:flex;gap:10px;align-items:flex-start;}
.form__row--checkbox label{font-size:12px;color:var(--text-2);margin:0;}
.form__row--checkbox a{color:var(--accent-light);text-decoration:underline;}
.form__status{font-size:13px;color:var(--accent-light);min-height:18px;}

/* Footer */
.site-footer{background:var(--bg-0);border-top:1px solid var(--line);padding:64px 0 24px;}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;}
.footer-grid h4{font-size:13px;color:var(--accent-light);text-transform:uppercase;letter-spacing:.05em;}
.footer-grid p{font-size:14px;margin-bottom:8px;}
.footer-grid a:hover{color:var(--accent-light);}
.logo--footer{margin-bottom:16px;}
.footer-bottom{margin-top:48px;padding-top:24px;border-top:1px solid var(--line);font-size:12px;color:var(--text-2);}

/* Reveal on scroll */
[data-reveal]{opacity:0;transform:translateY(24px);transition:opacity .7s ease, transform .7s ease;}
[data-reveal].is-visible{opacity:1;transform:translateY(0);}

/* Responsive */
@media (max-width:1024px){
  .cards-grid{grid-template-columns:repeat(2,1fr);}
  .type-panel__grid{grid-template-columns:1fr;}
  .steps-grid{grid-template-columns:repeat(2,1fr);}
  .construction-grid{grid-template-columns:repeat(2,1fr);}
  .process-line{grid-template-columns:repeat(3,1fr);}
  .articles-grid, .reviews-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .lead-form__inner{grid-template-columns:1fr;}
  .calc-box{grid-template-columns:1fr 1fr;}
}
@media (max-width:720px){
  .main-nav{display:none;}
  .nav-toggle{display:block;}
  .cards-grid, .steps-grid, .construction-grid, .process-line, .articles-grid, .reviews-grid{grid-template-columns:1fr;}
  .calc-box{grid-template-columns:1fr;}
  .hero__stats{gap:24px;}
  .section{padding:64px 0;}
}