/* ─────────────────────────────────────────
   IVAN ENERGY — Main Stylesheet
   Theme: dark grey-black-red, modern/industrial
───────────────────────────────────────── */

/* ── VARIABLES ── */
:root {
  --bg:         #0d0d0d;
  --bg2:        #111;
  --bg3:        #161616;
  --bg4:        #1c1c1c;
  --card:       #191919;
  --card-h:     #222;
  --red:        #e03030;
  --red-bright: #ff4444;
  --red-dark:   #a81e1e;
  --red-glow:   rgba(224,48,48,.44);
  --red-glow2:  rgba(224,48,48,.18);
  --txt:        #f2f2f2;
  --txt2:       #b8b8b8;
  --txt3:       #686868;
  --border:     rgba(255,255,255,.10);
  --border-r:   rgba(224,48,48,.32);
  --radius:     12px;
  --radius-lg:  20px;
  --shadow:     0 20px 60px rgba(0,0,0,.6);
  --shadow-r:   0 8px 32px rgba(212,43,43,.25);
  --trans:      .3s ease;
  --ff-head:    'Rajdhani', sans-serif;
  --ff-body:    'Inter', sans-serif;
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--txt);
  font-family: var(--ff-body);
  line-height: 1.6;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea {
  font-family: var(--ff-body);
  font-size: 1rem;
  background: none;
  border: none;
  outline: none;
  width: 100%;
}
textarea { resize: vertical; }

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--red-dark); border-radius: 3px; }

/* ── UTILITIES ── */
.container {
  width: min(1200px, 100% - 3rem);
  margin-inline: auto;
}
.section { padding: 100px 0; }
.red-text { color: var(--red-bright); }

/* buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .85rem 2rem;
  border-radius: 8px;
  font-family: var(--ff-head);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .5px;
  transition: var(--trans);
  white-space: nowrap;
}
.btn-red {
  background: var(--red);
  color: #fff;
  box-shadow: var(--shadow-r);
}
.btn-red:hover {
  background: var(--red-bright);
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(212,43,43,.4);
}
.btn-outline {
  border: 1.5px solid var(--border-r);
  color: var(--txt2);
}
.btn-outline:hover {
  border-color: var(--red);
  color: var(--txt);
  background: var(--red-glow2);
}
.btn-sm { padding: .55rem 1.2rem; font-size: .9rem; }
.btn-full { width: 100%; justify-content: center; }

/* section header */
.sec-header { text-align: center; margin-bottom: 64px; }
.sec-tag {
  display: inline-block;
  padding: .3rem .9rem;
  border: 1px solid var(--border-r);
  border-radius: 100px;
  color: var(--red);
  font-family: var(--ff-head);
  font-size: .85rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 1rem;
}
.sec-header h2 {
  font-family: var(--ff-head);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: .5px;
  margin-bottom: 1rem;
}
.sec-header p {
  color: var(--txt2);
  max-width: 600px;
  margin-inline: auto;
  font-size: 1.05rem;
}

/* ── NAVBAR ── */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 1.2rem 0;
  transition: background var(--trans), padding var(--trans), box-shadow var(--trans);
}
.navbar.scrolled {
  background: rgba(13,13,13,.94);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: .85rem 0;
  box-shadow: 0 1px 0 rgba(255,255,255,.05);
}
.nav-container {
  width: min(1200px, 100% - 3rem);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--ff-head);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 1px;
  flex-shrink: 0;
}
.nav-logo strong { color: var(--red); font-weight: 700; }
.logo-flame { width: 24px; height: 30px; flex-shrink: 0; }
.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-left: auto;
}
.nav-link {
  font-family: var(--ff-head);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: .5px;
  color: var(--txt2);
  transition: color var(--trans);
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 2px;
  background: var(--red);
  transition: width var(--trans);
}
.nav-link:hover { color: var(--txt); }
.nav-link:hover::after { width: 100%; }
.nav-cta {
  padding: .5rem 1.25rem;
  border: 1.5px solid var(--border-r);
  border-radius: 8px;
  color: var(--txt) !important;
}
.nav-cta:hover {
  background: var(--red);
  border-color: var(--red);
}
.nav-cta::after { display: none; }
.nav-right { display: flex; align-items: center; gap: 1rem; flex-shrink: 0; }
.lang-btn {
  font-family: var(--ff-head);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: 1px;
  color: var(--txt2);
  display: flex;
  align-items: center;
  gap: .3rem;
  transition: color var(--trans);
}
.lang-btn:hover { color: var(--txt); }
.lang-sep { color: var(--txt3); }
#langCurrent { color: var(--red); }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--txt);
  border-radius: 2px;
  transition: var(--trans);
}

/* ── NAV OVERLAY ── */
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.65);
  z-index: 999;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.nav-overlay.open { opacity: 1; pointer-events: auto; }

/* ── HERO ── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: radial-gradient(ellipse 80% 80% at 50% 110%, #2a0800 0%, #0d0d0d 60%);
}
#emberCanvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}
/* flames */
.hero-flames {
  position: absolute;
  bottom: 0; left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  pointer-events: none;
}
.flame-group {
  position: relative;
  width: 320px;
  height: 420px;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.fl {
  position: absolute;
  bottom: 0;
  border-radius: 50% 50% 20% 20% / 60% 60% 30% 30%;
  transform-origin: bottom center;
  filter: blur(2px);
}
.fl-1 {
  width: 200px; height: 350px;
  background: radial-gradient(ellipse at 50% 80%, #cc2200 0%, #660000 70%, transparent 100%);
  animation: flame1 2s ease-in-out infinite alternate;
  opacity: .8;
}
.fl-2 {
  width: 160px; height: 290px;
  background: radial-gradient(ellipse at 50% 80%, #ff4400 0%, #cc1100 60%, transparent 100%);
  animation: flame2 1.7s ease-in-out infinite alternate;
  opacity: .85;
}
.fl-3 {
  width: 120px; height: 240px;
  background: radial-gradient(ellipse at 50% 80%, #ff6600 0%, #dd2200 60%, transparent 100%);
  animation: flame3 1.4s ease-in-out infinite alternate;
  opacity: .9;
}
.fl-4 {
  width: 80px; height: 190px;
  background: radial-gradient(ellipse at 50% 80%, #ff8800 0%, #ff3300 60%, transparent 100%);
  animation: flame4 1.2s ease-in-out infinite alternate;
  opacity: .95;
}
.fl-5 {
  width: 50px; height: 140px;
  background: radial-gradient(ellipse at 50% 80%, #ffcc00 0%, #ff6600 60%, transparent 100%);
  animation: flame5 1s ease-in-out infinite alternate;
  filter: blur(1px);
}
.flame-base-glow {
  position: absolute;
  bottom: -20px;
  width: 300px; height: 80px;
  background: radial-gradient(ellipse, rgba(200,40,0,.55) 0%, transparent 70%);
  filter: blur(20px);
  animation: glow-pulse 2s ease-in-out infinite alternate;
}
.flame-base-glow2 {
  position: absolute;
  bottom: -50px;
  width: 560px; height: 100px;
  background: radial-gradient(ellipse, rgba(140,18,0,.4) 0%, transparent 62%);
  filter: blur(35px);
  animation: glow-pulse 3.5s ease-in-out infinite alternate 1.5s;
}
/* dark wide base — gives depth below the main flames */
.fl-0 {
  width: 380px; height: 180px;
  background: radial-gradient(ellipse at 50% 100%, rgba(110,0,0,.9) 0%, rgba(40,0,0,.55) 50%, transparent 80%);
  animation: flame0 3.5s ease-in-out infinite alternate;
  filter: blur(18px);
  opacity: .88;
}
/* side flames */
.fl-sl {
  width: 130px; height: 260px;
  left: 18px;
  transform-origin: bottom left;
  border-radius: 50% 40% 20% 20% / 60% 60% 30% 30%;
  background: radial-gradient(ellipse at 62% 80%, rgba(180,28,0,.9) 0%, rgba(80,0,0,.55) 60%, transparent 100%);
  animation: flameSL 2.4s ease-in-out infinite alternate;
  filter: blur(6px);
  opacity: .68;
}
.fl-sr {
  width: 130px; height: 260px;
  right: 18px;
  left: auto;
  transform-origin: bottom right;
  border-radius: 40% 50% 20% 20% / 60% 60% 30% 30%;
  background: radial-gradient(ellipse at 38% 80%, rgba(180,28,0,.9) 0%, rgba(80,0,0,.55) 60%, transparent 100%);
  animation: flameSR 2.1s ease-in-out infinite alternate;
  filter: blur(6px);
  opacity: .68;
}
/* bright yellow-white core */
.fl-6 {
  width: 28px; height: 130px;
  background: radial-gradient(ellipse at 50% 80%, #fff4cc 0%, #ffcc00 28%, #ff8800 65%, transparent 100%);
  animation: flame6 .78s ease-in-out infinite alternate;
  filter: blur(.6px);
  opacity: .88;
}

@keyframes flame0 {
  0%   { transform: scaleX(1)    scaleY(1);    opacity: .78; }
  100% { transform: scaleX(1.12) scaleY(.93);  opacity: .92; }
}
@keyframes flameSL {
  0%   { transform: rotate(-18deg) scaleY(1)    scaleX(1);   }
  100% { transform: rotate(-5deg)  scaleY(1.2)  scaleX(.88); }
}
@keyframes flameSR {
  0%   { transform: rotate(8deg)  scaleY(1.14) scaleX(.9);  }
  100% { transform: rotate(22deg) scaleY(.9)   scaleX(1.1); }
}
@keyframes flame6 {
  0%   { transform: scaleX(.72) scaleY(1.14) rotate(-6deg); opacity: .72; }
  100% { transform: scaleX(1.28) scaleY(.86) rotate(6deg);  opacity: 1;   }
}

@keyframes flame1 {
  0%   { transform: scaleX(1)    scaleY(1)    rotate(-2deg); }
  100% { transform: scaleX(1.08) scaleY(1.04) rotate(2deg);  }
}
@keyframes flame2 {
  0%   { transform: scaleX(1.05) scaleY(.98) rotate(3deg);  }
  100% { transform: scaleX(.95)  scaleY(1.06) rotate(-3deg); }
}
@keyframes flame3 {
  0%   { transform: scaleX(.97) scaleY(1.05) rotate(-4deg); }
  100% { transform: scaleX(1.08) scaleY(.95) rotate(3deg);  }
}
@keyframes flame4 {
  0%   { transform: scaleX(1.1) scaleY(.93) rotate(5deg);  }
  100% { transform: scaleX(.92) scaleY(1.1) rotate(-4deg); }
}
@keyframes flame5 {
  0%   { transform: scaleX(.9) scaleY(1.15) rotate(-6deg); }
  100% { transform: scaleX(1.15) scaleY(.9) rotate(6deg);  }
}
@keyframes glow-pulse {
  0%   { opacity: .5; transform: scaleX(.9);  }
  100% { opacity: .9; transform: scaleX(1.1); }
}

/* hero content */
.hero-content {
  position: relative;
  z-index: 10;
  width: min(1200px, 100% - 3rem);
  margin-inline: auto;
  padding: 120px 0 200px;
  max-width: 760px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .4rem 1rem;
  border: 1px solid var(--border-r);
  border-radius: 100px;
  font-family: var(--ff-head);
  font-size: .85rem;
  letter-spacing: 1.5px;
  color: var(--red);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero-h1 {
  font-family: var(--ff-head);
  font-size: clamp(2.8rem, 6vw, 5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .5px;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.hero-sub {
  color: var(--txt2);
  font-size: clamp(1rem, 2vw, 1.15rem);
  margin-bottom: 2.5rem;
  max-width: 560px;
}
.hero-btns {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}
.hero-kpis {
  display: flex;
  align-items: center;
  gap: 2rem;
  flex-wrap: wrap;
}
.kpi { display: flex; flex-direction: column; }
.kpi-n {
  font-family: var(--ff-head);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--red-bright);
  line-height: 1;
}
.kpi-s { font-family: var(--ff-head); font-size: 1.5rem; font-weight: 700; color: var(--red-bright); }
.kpi-l { font-size: .82rem; color: var(--txt3); letter-spacing: .5px; text-transform: uppercase; margin-top: .2rem; }
.kpi-div { width: 1px; height: 40px; background: var(--border); }

/* hero scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 2.5rem; left: 50%;
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .5rem;
  color: var(--txt3);
  font-size: .78rem;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.scroll-chevron {
  width: 20px; height: 20px;
  border-right: 2px solid var(--red);
  border-bottom: 2px solid var(--red);
  transform: rotate(45deg);
  animation: chevron-bounce 1.5s ease-in-out infinite;
}
@keyframes chevron-bounce {
  0%,100% { transform: rotate(45deg) translateY(0);   }
  50%      { transform: rotate(45deg) translateY(5px); }
}

/* ── REVEAL ANIMATIONS ── */
.reveal-up { opacity: 0; transform: translateY(30px); animation: revealUp .8s forwards; animation-delay: var(--d, 0s); }
@keyframes revealUp {
  to { opacity: 1; transform: translateY(0); }
}
[data-reveal] { opacity: 0; transform: translateY(40px); transition: opacity .7s ease, transform .7s ease; }
[data-reveal].visible { opacity: 1; transform: translateY(0); }

/* ── SERVICES ── */
.services { background: var(--bg2); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.svc-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  overflow: hidden;
  transition: border-color var(--trans), transform var(--trans), box-shadow var(--trans);
}
.svc-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--red), transparent);
  opacity: 0;
  transition: opacity var(--trans);
}
.svc-card:hover {
  border-color: var(--border-r);
  transform: translateY(-4px);
  box-shadow: var(--shadow-r);
}
.svc-card:hover::before { opacity: 1; }
.svc-icon {
  width: 48px; height: 48px;
  background: var(--red-glow2);
  border: 1px solid var(--border-r);
  border-radius: 10px;
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
  transition: background var(--trans);
}
.svc-icon svg { width: 22px; height: 22px; stroke: var(--red); }
.svc-card:hover .svc-icon { background: var(--red-glow); }
.svc-card h3 {
  font-family: var(--ff-head);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: .3px;
  margin-bottom: .7rem;
}
.svc-card p { color: var(--txt2); font-size: .95rem; line-height: 1.65; }

/* ── ABOUT ── */
.about { background: var(--bg); }
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 5rem;
  align-items: center;
}
.boiler-card {
  position: relative;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.boiler-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(ellipse, rgba(212,43,43,.15) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 40px;
}
.boiler-svg { width: 100%; max-width: 280px; }
.boiler-cert {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-top: 1.5rem;
  padding: .6rem 1rem;
  background: var(--red-glow2);
  border: 1px solid var(--border-r);
  border-radius: 8px;
  font-size: .85rem;
  color: var(--txt2);
}
/* svg inline animations */
.svg-pulse { animation: svgPulse 1.9s ease-in-out infinite alternate; }
.svg-pulse2 { animation: svgPulse2 1.4s ease-in-out infinite alternate; }
.svg-blink { animation: svgBlink 2s ease-in-out infinite; }
.smoke1 { animation: smoke 3s ease-in-out infinite; }
.smoke2 { animation: smoke 3s ease-in-out infinite 1s; }
@keyframes svgPulse {
  0%   { opacity: .58; filter: drop-shadow(0 0 5px rgba(255,60,0,.5));  }
  100% { opacity: 1;   filter: drop-shadow(0 0 14px rgba(255,100,0,.9)); }
}
@keyframes svgPulse2 {
  0%   { opacity: .5;  transform: scaleY(.9);   filter: drop-shadow(0 0 4px rgba(255,160,0,.5));  }
  100% { opacity: .96; transform: scaleY(1.07); filter: drop-shadow(0 0 10px rgba(255,210,0,.9)); }
}
@keyframes svgBlink  { 0%,90%,100% { opacity:1; } 95% { opacity:.2; } }
@keyframes smoke     { 0%,100% { opacity:.35; transform:translateY(0);   }
                       50%     { opacity:.15; transform:translateY(-10px); } }
.about-text-col { }
.about-text-col h2 {
  font-family: var(--ff-head);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: .3px;
  margin: 1rem 0 1.5rem;
}
.about-text-col p { color: var(--txt2); margin-bottom: 1rem; font-size: .98rem; line-height: 1.7; }
.about-features { display: flex; flex-direction: column; gap: .7rem; margin: 1.5rem 0 2rem; }
.af {
  display: flex;
  align-items: center;
  gap: .7rem;
  color: var(--txt2);
  font-size: .95rem;
}
.af svg { width: 16px; height: 16px; flex-shrink: 0; }
.about-stats { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.as-item { display: flex; flex-direction: column; }
.as-n {
  font-family: var(--ff-head);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--red-bright);
  line-height: 1;
}
.as-s { font-family: var(--ff-head); font-size: 1.4rem; font-weight: 700; color: var(--red-bright); }
.as-l { font-size: .78rem; color: var(--txt3); text-transform: uppercase; letter-spacing: .5px; margin-top: .2rem; }

/* ── PRODUCTS ── */
.products { background: var(--bg2); }
.feat-product {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border-r);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 3rem;
}
.feat-ribbon {
  position: absolute;
  top: 1.5rem; right: -30px;
  background: var(--red);
  color: #fff;
  font-family: var(--ff-head);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: .3rem 3rem;
  transform: rotate(45deg);
  transform-origin: center;
}
.feat-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
  padding: 3rem;
}
.feat-info h3 {
  font-family: var(--ff-head);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: .5px;
  margin-bottom: .5rem;
}
.feat-tagline { color: var(--txt2); margin-bottom: 2rem; font-size: 1rem; }
.specs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem 2rem;
  margin-bottom: 2rem;
}
.spec {
  display: flex;
  flex-direction: column;
  padding: .75rem;
  background: var(--bg3);
  border-radius: 8px;
  border: 1px solid var(--border);
}
.spec span { font-size: .78rem; color: var(--txt3); text-transform: uppercase; letter-spacing: .5px; margin-bottom: .25rem; }
.spec strong { font-family: var(--ff-head); font-size: 1.05rem; color: var(--txt); font-weight: 600; }
.feat-bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .6rem;
}
.feat-bullets li {
  display: flex;
  align-items: center;
  gap: .65rem;
  color: var(--txt2);
  font-size: .93rem;
}
.feat-bullets li::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--red);
  border-radius: 50%;
  flex-shrink: 0;
}
.feat-vis {
  position: relative;
  flex-shrink: 0;
  width: 240px;
}
.feat-glow {
  position: absolute;
  inset: -30px;
  background: radial-gradient(ellipse, rgba(212,43,43,.2) 0%, transparent 70%);
  pointer-events: none;
  border-radius: 50%;
}
.feat-svg { width: 100%; }
/* prod grid */
.prod-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}
.prod-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--trans), transform var(--trans);
}
.prod-card:hover { border-color: var(--border-r); transform: translateY(-3px); }
.prod-card-top { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: .75rem; }
.prod-card h4 { font-family: var(--ff-head); font-size: 1.05rem; font-weight: 600; }
.prod-range {
  font-family: var(--ff-head);
  font-size: .78rem;
  color: var(--red);
  background: var(--red-glow2);
  padding: .2rem .55rem;
  border-radius: 100px;
  border: 1px solid var(--border-r);
}
.prod-card p { color: var(--txt2); font-size: .9rem; line-height: 1.6; margin-bottom: 1rem; }
.prod-spec {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--border);
  padding-top: .75rem;
  font-size: .85rem;
}
.prod-spec :first-child { color: var(--txt3); }
.prod-spec :last-child { color: var(--txt); font-weight: 500; }

/* ── HOW IT WORKS ── */
.how { background: var(--bg); }
.diagram-wrap {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 3rem;
  overflow: hidden;
}
.diagram-svg { width: 100%; max-height: 440px; }

/* pipe flow animations */
.flow-h  { animation: flowAnim 1.8s linear infinite,        hotGlow 2.5s ease-in-out infinite; }
.flow-h2 { animation: flowAnim 1.8s linear infinite .4s,    hotGlow 2.5s ease-in-out infinite .9s; }
.flow-c  { animation: flowAnim 2.2s linear infinite reverse, coldGlow 3s ease-in-out infinite; }
@keyframes flowAnim { to { stroke-dashoffset: -46; } }
@keyframes hotGlow {
  0%,100% { filter: drop-shadow(0 0 3px rgba(255,60,0,.55)); }
  50%     { filter: drop-shadow(0 0 8px rgba(255,130,0,1)); }
}
@keyframes coldGlow {
  0%,100% { filter: drop-shadow(0 0 2px rgba(50,130,205,.5)); }
  50%     { filter: drop-shadow(0 0 7px rgba(90,185,255,.9)); }
}

/* boiler/diagram flame animations */
.d-flame  { animation: dFlame1 1.8s ease-in-out infinite alternate; }
.d-flame2 { animation: dFlame2 1.3s ease-in-out infinite alternate; }
@keyframes dFlame1 {
  0%   { opacity: .6;  filter: drop-shadow(0 0 5px rgba(255,55,0,.5));  }
  100% { opacity: 1;   filter: drop-shadow(0 0 12px rgba(255,90,0,.95)); }
}
@keyframes dFlame2 {
  0%   { opacity: .52; transform: scaleY(.92); filter: drop-shadow(0 0 3px rgba(255,140,0,.5));  }
  100% { opacity: 1;   transform: scaleY(1.1); filter: drop-shadow(0 0 9px rgba(255,200,0,.9));  }
}

/* wave */
.wave { animation: waveAnim 3s ease-in-out infinite; }
@keyframes waveAnim {
  0%,100% { transform: translateX(0);   }
  50%      { transform: translateX(6px); }
}

.diagram-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
}
.leg-item { display: flex; align-items: center; gap: .6rem; font-size: .85rem; color: var(--txt2); }
.leg-line { display: block; width: 36px; height: 4px; border-radius: 2px; }
.leg-r { background: var(--red); }
.leg-b { background: #3388cc; }
.leg-dot {
  display: block;
  width: 14px; height: 14px;
  border-radius: 50%;
  border: 2px solid var(--red);
  background: var(--bg3);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}
.step-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem 1.5rem;
  transition: border-color var(--trans), transform var(--trans);
}
.step-card:hover { border-color: var(--border-r); transform: translateY(-3px); }
.step-n {
  display: block;
  font-family: var(--ff-head);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--red);
  opacity: .4;
  line-height: 1;
  margin-bottom: .75rem;
}
.step-card h4 { font-family: var(--ff-head); font-size: 1.1rem; font-weight: 600; margin-bottom: .5rem; }
.step-card p { color: var(--txt2); font-size: .9rem; line-height: 1.65; }

/* ── BENEFITS ── */
.benefits { background: var(--bg2); }
.ben-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}
.ben-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--trans), transform var(--trans), box-shadow var(--trans);
}
.ben-card:hover {
  border-color: var(--border-r);
  transform: translateY(-4px);
  box-shadow: var(--shadow-r);
}
.ben-icon {
  width: 48px; height: 48px;
  background: var(--red);
  border-radius: 10px;
  display: grid;
  place-items: center;
  margin-bottom: 1.25rem;
  transition: background var(--trans);
}
.ben-icon svg { width: 22px; height: 22px; }
.ben-card:hover .ben-icon { background: var(--red-bright); }
.ben-card h4 { font-family: var(--ff-head); font-size: 1.1rem; font-weight: 600; margin-bottom: .6rem; }
.ben-card p { color: var(--txt2); font-size: .9rem; line-height: 1.65; }

/* ── TESTIMONIALS ── */
.testimonials { background: var(--bg); }
.tes-slider { position: relative; }
.tes-card {
  display: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  max-width: 700px;
  margin-inline: auto;
  animation: fadeIn .4s ease;
}
.tes-card.active { display: block; }
@keyframes fadeIn { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:none; } }
.tes-stars { color: var(--red); font-size: 1.3rem; margin-bottom: 1.25rem; }
.tes-card p {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--txt2);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}
.tes-author { display: flex; align-items: center; gap: .9rem; }
.tes-av {
  width: 44px; height: 44px;
  background: var(--red-glow);
  border: 1.5px solid var(--border-r);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--ff-head);
  font-size: .9rem;
  font-weight: 600;
  flex-shrink: 0;
  color: var(--red);
}
.tes-author strong { display: block; font-weight: 600; margin-bottom: .1rem; }
.tes-author span { font-size: .82rem; color: var(--txt3); }
.tes-dots {
  display: flex;
  justify-content: center;
  gap: .6rem;
  margin-top: 2rem;
}
.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--border);
  transition: background var(--trans), transform var(--trans);
}
.dot.active {
  background: var(--red);
  transform: scale(1.3);
}

/* ── CONTACT ── */
.contact { background: var(--bg2); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}
.contact-info h2 {
  font-family: var(--ff-head);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
  margin: 1rem 0 1rem;
}
.contact-info > p { color: var(--txt2); margin-bottom: 2rem; font-size: .98rem; }
.ct-items { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 2rem; }
.ct-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color var(--trans);
}
.ct-item:hover { border-color: var(--border-r); }
.ct-icon {
  width: 40px; height: 40px;
  background: var(--red-glow2);
  border: 1px solid var(--border-r);
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--red);
}
.ct-icon svg { width: 18px; height: 18px; }
.ct-item div:last-child { display: flex; flex-direction: column; }
.ct-item span { font-size: .78rem; color: var(--txt3); text-transform: uppercase; letter-spacing: .5px; }
.ct-item strong { font-size: .95rem; font-weight: 500; color: var(--txt); }
.emerg-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.2rem 1.5rem;
  background: linear-gradient(135deg, rgba(212,43,43,.12), rgba(212,43,43,.05));
  border: 1px solid var(--border-r);
  border-radius: var(--radius);
  flex-wrap: wrap;
}
.emerg-flame { font-size: 1.5rem; }
.emerg-banner > div { flex: 1; }
.emerg-banner strong { display: block; font-size: .95rem; margin-bottom: .2rem; }
.emerg-banner span { font-size: .82rem; color: var(--txt3); }
/* contact form */
.contact-form-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.fg { display: flex; flex-direction: column; gap: .4rem; margin-bottom: 1.25rem; }
.fg label { font-size: .82rem; color: var(--txt3); letter-spacing: .5px; text-transform: uppercase; }
.fg input, .fg select, .fg textarea {
  padding: .8rem 1rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--txt);
  transition: border-color var(--trans);
  appearance: none;
  -webkit-appearance: none;
}
.fg input:focus, .fg select:focus, .fg textarea:focus { border-color: var(--red); }
.fg input::placeholder, .fg textarea::placeholder { color: var(--txt3); }
.form-note { font-size: .75rem; color: var(--txt3); margin-top: .75rem; line-height: 1.5; }

/* ── FOOTER ── */
.footer {
  background: var(--bg);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: .6rem;
  font-family: var(--ff-head);
  font-size: 1.15rem;
  font-weight: 500;
  letter-spacing: 1px;
  margin-bottom: 1rem;
}
.footer-logo strong { color: var(--red); }
.footer-logo .logo-flame { width: 22px; height: 28px; }
.footer-brand p { color: var(--txt3); font-size: .9rem; line-height: 1.6; margin-bottom: 1.25rem; }
.footer-certs { display: flex; flex-direction: column; gap: .4rem; }
.footer-certs span { font-size: .8rem; color: var(--txt3); }
.footer-col h5 {
  font-family: var(--ff-head);
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--txt2);
  margin-bottom: 1.25rem;
}
.footer-col ul { display: flex; flex-direction: column; gap: .6rem; }
.footer-col a { color: var(--txt3); font-size: .9rem; transition: color var(--trans); }
.footer-col a:hover { color: var(--red); }
.footer-col p { color: var(--txt3); font-size: .9rem; line-height: 1.8; }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: .5rem;
  font-size: .82rem;
  color: var(--txt3);
}

/* ── MOBILE NAV ── */
@media (max-width: 900px) {
  .nav-menu {
    position: fixed;
    top: 0; right: -100%;
    width: min(320px, 80vw);
    height: 100vh;
    background: rgba(10,10,10,.98);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: .5rem;
    padding: 2rem;
    transition: right var(--trans);
    border-left: 1px solid var(--border-r);
    z-index: 1000;
  }
  .nav-menu.open { right: 0; }
  .nav-link { font-size: 1.3rem; padding: .5rem 0; min-height: 44px; display: flex; align-items: center; }
  .hamburger { display: flex; min-width: 44px; min-height: 44px; align-items: center; justify-content: center; }
  .hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .hamburger.open span:nth-child(2) { opacity: 0; }
  .hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .about-visual { max-width: 320px; margin-inline: auto; }
  .feat-inner { grid-template-columns: 1fr; }
  .feat-vis { width: 200px; margin-inline: auto; }
  .feat-ribbon { display: none; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .section { padding: 80px 0; }
  .steps-grid { grid-template-columns: 1fr 1fr; }
  .ben-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .section { padding: 64px 0; }
  .hero-content { padding: 100px 0 160px; text-align: center; }
  .hero-sub { max-width: 100%; }
  .hero-btns { flex-direction: column; align-items: center; }
  .hero-btns .btn { width: 100%; max-width: 320px; justify-content: center; }
  .hero-kpis { gap: 1.25rem; justify-content: center; }
  .kpi-div { height: 30px; }
  /* scale flames for smaller screens */
  .flame-group { width: 240px; height: 320px; }
  .fl-0  { width: 300px; height: 140px; }
  .fl-sl { width: 100px; height: 200px; left: 10px; }
  .fl-sr { width: 100px; height: 200px; right: 10px; }
  .fl-1  { width: 160px; height: 270px; }
  .fl-2  { width: 128px; height: 220px; }
  .fl-3  { width: 95px;  height: 185px; }
  .fl-4  { width: 63px;  height: 150px; }
  .fl-5  { width: 40px;  height: 108px; }
  .fl-6  { width: 22px;  height: 100px; }
  .flame-base-glow  { width: 220px; }
  .flame-base-glow2 { width: 380px; }
  /* diagram scrollable */
  .diagram-wrap { padding: .75rem; overflow-x: auto; -webkit-overflow-scrolling: touch; overflow-y: hidden; }
  .diagram-svg  { min-width: 560px; width: 560px; max-height: none; height: 260px; }
  /* misc */
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .feat-inner { padding: 1.5rem; }
  .specs-grid { grid-template-columns: 1fr; }
  .about-stats { gap: 1.5rem; }
  .emerg-banner { flex-direction: column; text-align: center; }
  .steps-grid { grid-template-columns: 1fr 1fr; }
  .ben-grid   { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-content { padding: 88px 0 140px; }
  .hero-h1 { font-size: 2.3rem; }
  .flame-group { width: 200px; height: 280px; }
  .fl-0  { width: 250px; height: 115px; }
  .fl-sl { width: 85px;  height: 175px; left: 6px; }
  .fl-sr { width: 85px;  height: 175px; right: 6px; }
  .fl-1  { width: 140px; height: 235px; }
  .fl-2  { width: 112px; height: 190px; }
  .fl-3  { width: 82px;  height: 158px; }
  .fl-4  { width: 54px;  height: 128px; }
  .fl-5  { width: 34px;  height: 92px;  }
  .fl-6  { width: 18px;  height: 82px;  }
  .flame-base-glow  { width: 190px; }
  .flame-base-glow2 { width: 320px; }
  .steps-grid { grid-template-columns: 1fr; }
  .sec-header { margin-bottom: 48px; }
  .container { width: min(1200px, 100% - 2rem); }
}

/* ── TOAST ── */
.toast {
  position: fixed;
  bottom: 2rem; right: 2rem;
  background: var(--card);
  border: 1px solid var(--border-r);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  gap: .75rem;
  font-size: .9rem;
  color: var(--txt);
  box-shadow: var(--shadow);
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  transition: transform .4s ease, opacity .4s ease;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-icon { color: var(--red); font-size: 1.2rem; }