:root{
  --navy-900:#0a1930;
  --navy-800:#0d2340;
  --navy-700:#10335c;
  --blue-600:#1b7ab0;
  --blue-500:#2f8fc6;
  --blue-400:#5bb0dd;
  --blue-300:#8fcdec;
  --ink:#10213a;
  --ink-soft:#4a5d78;
  --paper:#f6f9fc;
  --paper-2:#eef3f8;
  --white:#ffffff;
  --line:#e1e9f1;
  --danger:#c0392b;
  --danger-bg:#fdf1ef;
  --ok-bg:#eef7f2;
  --ok:#1f7a4d;
  --warn-bg:#fff6ea;
  --warn:#9a6b11;

  --font-head:'Manrope', 'Inter', sans-serif;
  --font-body:'Inter', 'Manrope', sans-serif;

  --header-h:76px;
  --ease: cubic-bezier(.22,.9,.3,1);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;cursor:pointer;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{font-family:var(--font-head);margin:0;color:var(--ink);}
p{margin:0;}

.noise-overlay{
  position:fixed;inset:0;pointer-events:none;z-index:2;
  background-image:radial-gradient(circle at 1px 1px, rgba(255,255,255,0.025) 1px, transparent 0);
  background-size:3px 3px;
  mix-blend-mode:overlay;
  opacity:.5;
}

/* ===================== TOPBAR ===================== */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--header-h);
  background:rgba(10,25,48,0.72);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,0.08);
  transition:background .4s var(--ease), box-shadow .4s var(--ease);
}
.topbar.is-scrolled{
  box-shadow:0 10px 30px -14px rgba(0,0,0,0.5);
}
.topbar-inner{
  max-width:1360px;margin:0 auto;height:100%;
  display:flex;align-items:center;justify-content:space-between;
  padding:0 28px;
  gap:24px;
}
.brand{
  display:flex;align-items:center;gap:10px;
  flex-shrink:0;
  background:none;border:none;
}
.brand-logo{width:34px;height:auto;filter:drop-shadow(0 0 0 transparent);}
.brand-text{
  font-family:var(--font-head);
  font-weight:800;
  font-size:15px;
  letter-spacing:.08em;
  color:#fff;
}

.tabs{
  display:flex;
  align-items:center;
  gap:2px;
  overflow-x:auto;
  scrollbar-width:none;
  flex:1;
  justify-content:center;
}
.tabs::-webkit-scrollbar{display:none;}
.tab-btn{
  position:relative;
  background:none;border:none;
  color:rgba(255,255,255,0.62);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.01em;
  padding:10px 14px;
  border-radius:8px;
  white-space:nowrap;
  transition:color .25s var(--ease), background .25s var(--ease);
}
.tab-btn:hover{color:#fff;background:rgba(255,255,255,0.06);}
.tab-btn.is-active{color:#fff;}

.tab-indicator{
  position:absolute;
  bottom:0;
  height:2.5px;
  background:linear-gradient(90deg,var(--blue-400),var(--blue-300));
  border-radius:3px;
  transition:left .45s var(--ease), width .45s var(--ease);
  box-shadow:0 0 12px rgba(91,176,221,.7);
}

.burger{
  display:none;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:34px;height:34px;
  background:none;border:none;
  flex-shrink:0;
}
.burger span{
  display:block;width:20px;height:2px;background:#fff;border-radius:2px;margin:0 auto;
  transition:transform .3s var(--ease), opacity .3s var(--ease);
}
.burger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.burger.is-open span:nth-child(2){opacity:0;}
.burger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ===================== PANELS / TAB TRANSITIONS ===================== */
#panels{
  position:relative;
  min-height:100vh;
}
.panel{
  position:absolute;
  top:0;left:0;right:0;
  min-height:100vh;
  padding-top:var(--header-h);
  opacity:0;
  visibility:hidden;
  pointer-events:none;
  transform:translateY(18px) scale(.99);
  transition:opacity .5s var(--ease), transform .55s var(--ease), visibility 0s linear .5s;
}
.panel.is-active{
  position:relative;
  opacity:1;
  visibility:visible;
  pointer-events:auto;
  transform:translateY(0) scale(1);
  transition:opacity .55s var(--ease), transform .6s var(--ease);
}
.panel.is-leaving{
  transform:translateY(-14px) scale(.99);
}

/* watermark: half gear fixed to the left edge of the viewport on light panels */
.gear-watermark{
  position:fixed;
  left:0;
  top:var(--header-h);
  height:calc(100vh - var(--header-h));
  aspect-ratio:1/1;
  transform:translateX(-50%);
  background:url('assets/gear-watermark.png') center/contain no-repeat;
  pointer-events:none;
  z-index:0;
  opacity:0;
  transition:opacity .5s var(--ease);
}
body.show-watermark .gear-watermark{opacity:1;}
.panel-inner{
  max-width:1200px;
  margin:0 auto;
  padding:72px 32px 120px;
  position:relative;
  z-index:2;
}

/* ===================== HERO ===================== */
#hero{min-height:100vh;}
.hero-bg{
  position:absolute;inset:0;
  background-image:url('assets/hero-pipes-v2.jpg');
  background-size:cover;
  background-position:center 40%;
  filter:brightness(1.35) saturate(1.05);
  z-index:0;
}
.hero-gradient{
  position:absolute;inset:0;
  background:
    linear-gradient(180deg, rgba(27,122,176,0.55) 0%, rgba(47,143,198,0.35) 40%, rgba(16,51,92,0.6) 100%),
    linear-gradient(120deg, rgba(27,122,176,0.3), rgba(91,176,221,0.2));
  z-index:1;
}
.hero-inner{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding-top:var(--header-h);
  color:#fff;
}
.hero-eyebrow{
  font-size:13px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--blue-300);
  margin-bottom:18px;
}
.hero-title{
  font-size:clamp(32px, 5vw, 56px);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-0.01em;
  max-width:980px;
  margin-bottom:22px;
  color:#fff;
  text-shadow:0 2px 18px rgba(8,20,40,0.35);
}
.hero-sub{
  font-size:17px;
  line-height:1.6;
  color:rgba(255,255,255,0.82);
  max-width:620px;
  margin-bottom:36px;
}
.hero-actions{
  display:flex;gap:14px;flex-wrap:wrap;
  margin-bottom:64px;
}
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 24px;
  border-radius:999px;
  font-weight:700;
  font-size:14.5px;
  border:1.5px solid transparent;
  transition:transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.btn i{font-size:16px;transition:transform .25s var(--ease);}
.btn:hover{transform:translateY(-2px);}
.btn:hover i{transform:translateX(3px);}
.btn-primary{
  background:linear-gradient(135deg, var(--blue-500), var(--blue-600));
  color:#fff;
  box-shadow:0 14px 30px -12px rgba(27,122,176,.8);
}
.btn-primary:hover{box-shadow:0 18px 36px -12px rgba(27,122,176,.95);}
.btn-ghost{
  background:rgba(255,255,255,0.06);
  border-color:rgba(255,255,255,0.35);
  color:#fff;
}
.btn-ghost:hover{background:rgba(255,255,255,0.14);border-color:#fff;}

.hero-stats{
  display:grid;
  grid-template-columns:repeat(4,auto);
  justify-content:start;
  gap:20px 48px;
  max-width:900px;
  padding-top:28px;
  border-top:1px solid rgba(255,255,255,0.18);
}
.stat{display:flex;flex-direction:column;gap:4px;}
.stat-num{font-family:var(--font-head);font-weight:800;font-size:22px;color:#fff;white-space:nowrap;}
.stat-label{font-size:12px;color:rgba(255,255,255,0.65);letter-spacing:.01em;}

.scroll-cue{
  position:absolute;bottom:28px;left:50%;transform:translateX(-50%);
  color:rgba(255,255,255,0.65);
  font-size:20px;
  animation:bob 2.2s ease-in-out infinite;
  z-index:2;
}
@keyframes bob{
  0%,100%{transform:translate(-50%,0);}
  50%{transform:translate(-50%,8px);}
}

/* ===================== SECTION COMMON ===================== */
.section-tag{
  font-family:var(--font-head);
  font-size:clamp(26px,3.4vw,38px);
  font-weight:800;
  letter-spacing:.04em;
  line-height:1.2;
  color:var(--blue-600);
  margin-bottom:28px;
}
.section-tag.light{color:var(--blue-300);}
.section-title{
  font-size:clamp(26px,3.4vw,38px);
  font-weight:800;
  letter-spacing:-0.01em;
  margin-bottom:18px;
  max-width:820px;
  line-height:1.2;
}
.section-title.light{color:#fff;}
.section-lead{
  font-size:16.5px;
  line-height:1.7;
  color:var(--ink-soft);
  max-width:740px;
  margin-bottom:48px;
}
.section-lead.light{color:rgba(255,255,255,0.82);}
.subsection-title{
  font-size:20px;font-weight:800;
  margin:8px 0 24px;
  padding-top:8px;
  color:var(--ink);
}
.product-heading{
  font-size:clamp(40px,6vw,64px);
}

/* reveal-on-scroll */
.reveal{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .7s var(--ease), transform .7s var(--ease);
}
.reveal.is-visible{opacity:1;transform:translateY(0);}
.reveal-stagger > *{
  opacity:0;
  transform:translateY(22px);
  transition:opacity .6s var(--ease), transform .6s var(--ease);
}
.reveal-stagger.is-visible > *{opacity:1;transform:translateY(0);}
.reveal-stagger.is-visible > *:nth-child(1){transition-delay:.02s;}
.reveal-stagger.is-visible > *:nth-child(2){transition-delay:.08s;}
.reveal-stagger.is-visible > *:nth-child(3){transition-delay:.14s;}
.reveal-stagger.is-visible > *:nth-child(4){transition-delay:.20s;}
.reveal-stagger.is-visible > *:nth-child(5){transition-delay:.26s;}
.reveal-stagger.is-visible > *:nth-child(6){transition-delay:.32s;}
.reveal-stagger.is-visible > *:nth-child(7){transition-delay:.38s;}
.reveal-stagger.is-visible > *:nth-child(8){transition-delay:.44s;}
.reveal-stagger.is-visible > *:nth-child(9){transition-delay:.50s;}
.reveal-stagger.is-visible > *:nth-child(10){transition-delay:.56s;}

.fade-up{opacity:0;transform:translateY(16px);animation:fadeUp .7s var(--ease) forwards;animation-delay:calc(var(--d,0) * .09s);}
@keyframes fadeUp{to{opacity:1;transform:translateY(0);}}

/* ===================== GRIDS / CARDS ===================== */
.grid-5{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:16px;margin-bottom:56px;}
.grid-4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px;margin-bottom:56px;}
.grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-bottom:40px;}
.grid-3--single{grid-template-columns:minmax(0,1fr);max-width:620px;}
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;}
.char-grid{margin-bottom:64px;}

.facts{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;
  margin:-16px 0 40px;
}
.fact{
  display:flex;align-items:flex-start;gap:14px;
  background:var(--navy-900);
  border-radius:14px;
  padding:18px 20px;
  color:#fff;
}
.fact i{font-size:24px;color:var(--blue-400);flex-shrink:0;margin-top:2px;}
.fact strong{display:block;font-family:var(--font-head);font-size:15px;margin-bottom:4px;}
.fact span{font-size:13px;line-height:1.5;color:rgba(255,255,255,0.7);}

.feat-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:16px;
  padding:26px 20px;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.feat-card:hover{transform:translateY(-6px);box-shadow:0 20px 36px -22px rgba(16,33,58,.25);border-color:var(--blue-300);}
.feat-icon{
  font-size:26px;color:var(--blue-600);
  display:inline-flex;align-items:center;justify-content:center;
  width:50px;height:50px;border-radius:12px;
  background:linear-gradient(145deg,#eaf4fb,#dbeefb);
  margin-bottom:16px;
}
.feat-icon--img{
  width:50px;height:50px;border-radius:12px;
  background:linear-gradient(145deg,#eaf4fb,#dbeefb);
  padding:10px;
  margin-bottom:16px;
  object-fit:contain;
}
.feat-card h3{font-size:15.5px;margin-bottom:8px;line-height:1.35;}
.feat-card p{font-size:13.5px;color:var(--ink-soft);line-height:1.5;}

.info-card{
  background:var(--paper-2);
  border-radius:16px;
  padding:26px;
}
.info-card h3{font-size:16px;margin-bottom:10px;}
.info-card p{font-size:14px;line-height:1.65;color:var(--ink-soft);}

.divider-wave{
  height:1px;
  background:linear-gradient(90deg, transparent, var(--line) 20%, var(--line) 80%, transparent);
  margin:8px 0 40px;
}

.note-strip{
  display:flex;align-items:flex-start;gap:14px;
  background:linear-gradient(135deg,#eaf4fb,#f3f9fd);
  border:1px solid var(--blue-300);
  border-radius:14px;
  padding:18px 22px;
  margin-top:40px;
  font-size:14px;
  color:var(--ink-soft);
  line-height:1.6;
}
.note-strip i{font-size:20px;color:var(--blue-600);flex-shrink:0;margin-top:1px;}
.note-strip.good{background:var(--ok-bg);border-color:#bfe3cf;}
.note-strip.good i{color:var(--ok);}

.download-strip{
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  background:var(--navy-900);
  border-radius:18px;
  padding:26px 30px;
  color:#fff;
  margin-top:-16px;
  position:relative;overflow:hidden;
}
.download-strip::after{
  content:'';position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(260px 200px at 95% 10%, rgba(91,176,221,.3), transparent 70%);
}
.download-text{display:flex;align-items:center;gap:16px;position:relative;z-index:1;}
.download-text i{font-size:38px;color:var(--blue-300);}
.download-text h3{color:#fff;font-size:17px;margin-bottom:4px;}
.download-text p{font-size:13px;color:rgba(255,255,255,0.65);}
.download-actions{display:flex;gap:12px;flex-wrap:wrap;position:relative;z-index:1;}
.btn-outline{
  background:transparent;
  border-color:rgba(255,255,255,0.4);
  color:#fff;
}
.btn-outline:hover{background:rgba(255,255,255,0.1);border-color:#fff;}

.char-card{
  background:#fff;
  border:1px solid var(--line);
  border-radius:14px;
  padding:20px;
  display:flex;flex-direction:column;gap:12px;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease);
}
.char-card:hover{transform:translateY(-4px);box-shadow:0 16px 28px -20px rgba(16,33,58,.3);}
.char-card i{font-size:22px;color:var(--blue-600);}
.char-card p{font-size:13.5px;color:var(--ink);line-height:1.5;}

.app-card{
  background:var(--navy-900);
  border-radius:16px;
  padding:26px 22px;
  color:#fff;
  position:relative;
  overflow:hidden;
  transition:transform .3s var(--ease);
}
.app-card:hover{transform:translateY(-6px);}
.app-card::after{
  content:'';
  position:absolute;inset:0;
  background:radial-gradient(140px 140px at 85% 0%, rgba(91,176,221,.28), transparent 70%);
  pointer-events:none;
}
.app-icon{font-size:26px;color:var(--blue-400);margin-bottom:16px;display:block;}
.app-card h4{font-size:15px;margin-bottom:10px;line-height:1.3;}
.app-card p{font-size:13px;line-height:1.6;color:rgba(255,255,255,0.72);}

.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.col-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px;
}
.col-head{display:flex;align-items:center;gap:12px;margin-bottom:20px;}
.col-head i{font-size:22px;color:var(--blue-600);}
.col-head h3{font-size:18px;}
.check-list li{
  position:relative;
  padding-left:26px;
  margin-bottom:14px;
  font-size:14px;
  line-height:1.6;
  color:var(--ink-soft);
}
.check-list li::before{
  content:'\2713';
  position:absolute;left:0;top:0;
  color:var(--blue-600);
  font-weight:800;
  font-size:13px;
}
.check-list--accent li::before{color:var(--blue-500);}
.check-list--danger li::before{content:'!';color:var(--danger);}

.timeline{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:20px;
  margin-bottom:56px;
  position:relative;
}
.timeline-item{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px 20px;
  position:relative;
}
.timeline-num{
  font-family:var(--font-head);font-weight:800;font-size:28px;
  color:var(--blue-300);
  margin-bottom:10px;
}
.timeline-item h4{font-size:15px;margin-bottom:8px;}
.timeline-item p{font-size:13.5px;color:var(--ink-soft);line-height:1.55;}

.cond-card{
  display:flex;align-items:flex-start;gap:12px;
  padding:18px 20px;
  border-radius:14px;
  font-size:14px;
  line-height:1.5;
}
.cond-card.ok{background:var(--ok-bg);color:#145033;}
.cond-card.ok i{color:var(--ok);}
.cond-card.warn{background:var(--warn-bg);color:#6b4a06;}
.cond-card.warn i{color:var(--warn);}
.cond-card i{font-size:19px;flex-shrink:0;margin-top:1px;}

.case-grid{margin-top:8px;}
.case-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;padding:32px;
  transition:transform .3s var(--ease), box-shadow .3s var(--ease);
}
.case-card:hover{transform:translateY(-5px);box-shadow:0 20px 36px -22px rgba(16,33,58,.25);}
.case-icon{font-size:30px;color:var(--blue-600);margin-bottom:18px;display:block;}
.case-icon--img{width:40px;height:40px;object-fit:contain;}
.case-card h3{font-size:17px;margin-bottom:12px;line-height:1.35;}
.case-card p{font-size:14px;line-height:1.7;color:var(--ink-soft);}

/* ===================== CONTACTS ===================== */
#contacts{min-height:100vh;}
.contacts-bg{
  position:absolute;inset:0;
  background-image:url('assets/hero-pipes-v2.jpg');
  background-size:cover;
  background-position:center 40%;
  filter:brightness(1.35) saturate(1.05);
  z-index:0;
}
.contacts-gradient{
  position:absolute;inset:0;
  background:
    linear-gradient(180deg, rgba(27,122,176,0.55) 0%, rgba(47,143,198,0.35) 40%, rgba(16,51,92,0.6) 100%),
    linear-gradient(120deg, rgba(27,122,176,0.3), rgba(91,176,221,0.2));
  z-index:1;
}
.contacts-inner{
  min-height:100vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  color:#fff;
}
.contacts-grid{
  display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;
  max-width:720px;margin-bottom:56px;
}
.contact-card{
  display:flex;align-items:flex-start;gap:16px;
  background:rgba(255,255,255,0.06);
  border:1px solid rgba(255,255,255,0.14);
  border-radius:16px;
  padding:24px;
  transition:transform .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
}
a.contact-card:hover{transform:translateY(-4px);background:rgba(255,255,255,0.1);border-color:rgba(255,255,255,0.3);}
.contact-card i{font-size:24px;color:var(--blue-300);margin-top:2px;}
.contact-label{display:block;font-size:12px;letter-spacing:.1em;color:rgba(255,255,255,0.55);margin-bottom:6px;text-transform:uppercase;}
.contact-value{display:block;font-size:16px;font-weight:600;line-height:1.5;}

.logo-stamp{opacity:.9;margin-bottom:28px;}
.logo-stamp img{width:46px;}

.footer-line{
  font-size:12.5px;
  color:rgba(255,255,255,0.45);
  border-top:1px solid rgba(255,255,255,0.12);
  padding-top:22px;
}

/* ===================== RESPONSIVE ===================== */
@media (max-width:1080px){
  .grid-5{grid-template-columns:repeat(3,minmax(0,1fr));}
  .grid-4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .timeline{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:860px){
  .burger{display:flex;}
  .tabs{
    position:fixed;
    top:var(--header-h);left:0;right:0;
    flex-direction:column;
    align-items:stretch;
    background:rgba(9,22,43,0.98);
    backdrop-filter:blur(18px);
    padding:0 18px;
    max-height:0;
    overflow:hidden;
    visibility:hidden;
    transition:max-height .45s var(--ease), padding .45s var(--ease), visibility 0s linear .45s;
    gap:2px;
    justify-content:flex-start;
  }
  .tabs.is-open{max-height:70vh;overflow-y:auto;padding:10px 18px 26px;visibility:visible;transition:max-height .45s var(--ease), padding .45s var(--ease);}
  .tab-btn{text-align:left;padding:13px 10px;border-radius:10px;}
  .tab-indicator{display:none;}
  .two-col{grid-template-columns:1fr;}
  .contacts-grid{grid-template-columns:1fr;}
  .hero-stats{grid-template-columns:repeat(2,auto);gap:18px 36px;}
  .facts{grid-template-columns:1fr;}
  .gear-watermark{height:70vh;top:auto;bottom:0;}
}

@media (max-width:640px){
  .panel-inner{padding:48px 20px 90px;}
  .grid-5,.grid-4,.grid-3,.grid-2,.timeline{grid-template-columns:1fr;}
  .hero-title{font-size:28px;overflow-wrap:anywhere;}
  .br-desktop{display:none;}
  .hero-stats{grid-template-columns:1fr 1fr;}
  .stat-num{font-size:19px;}
  .hero-actions{flex-direction:column;align-items:flex-start;}
  .topbar-inner{padding:0 18px;}
  .brand-text{display:none;}
}