/* ================================================================
   SEPTRA — Bioseptic Systems Website
   Modern Eco-Tech Design 2025
   Palette: Deep Ocean Blue + Steel Gray + Aqua + White
================================================================ */

/* ========== CSS CUSTOM PROPERTIES ========== */
:root {
  /* Colors */
  --primary: #0077B6;
  --primary-dark: #023E8A;
  --primary-light: #0096C7;
  --aqua: #00B4D8;
  --aqua-light: #90E0EF;
  --aqua-pale: #CAF0F8;
  --green: #5B6F7A;
  --green-dark: #3D4F58;
  --green-light: #8DA5B0;
  --green-pale: #DDE6EA;
  --yellow: #F4B942;
  --yellow-pale: #FEF3C7;
  --purple: #7B5EA7;
  --teal: #4A7F9B;
  --teal-pale: #D4E8F0;
  --white: #FFFFFF;
  --off-white: #F8FAFC;
  --gray-50: #F9FAFB;
  --gray-100: #F3F4F6;
  --gray-200: #E5E7EB;
  --gray-300: #D1D5DB;
  --gray-500: #6B7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --dark: #0A1628;
  --dark-blue: #0D2137;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #0077B6 0%, #023E8A 100%);
  --grad-aqua: linear-gradient(135deg, #00B4D8 0%, #0096C7 100%);
  --grad-green: linear-gradient(135deg, #5B6F7A 0%, #3D4F58 100%);
  --grad-hero: linear-gradient(135deg, #0D2137 0%, #023E8A 60%, #2C3E50 100%);
  --grad-card: linear-gradient(135deg, rgba(255,255,255,0.12) 0%, rgba(255,255,255,0.05) 100%);

  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Spacing */
  --section-padding: 100px 0;
  --container-max: 1200px;
  --border-radius: 20px;
  --border-radius-sm: 12px;
  --border-radius-lg: 32px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-md: 0 8px 32px rgba(0,0,0,0.12);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.18);
  --shadow-blue: 0 8px 32px rgba(0,119,182,0.3);
  --shadow-green: 0 8px 32px rgba(91,111,122,0.3);

  /* Transitions */
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== RESET & BASE ========== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--gray-900);
  background: var(--white);
  line-height: 1.6;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

a { text-decoration: none; color: inherit; }

ul { list-style: none; }

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

.section {
  padding: var(--section-padding);
}

.gradient-text {
  background: linear-gradient(90deg, #00B4D8, #5B6F7A);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Glass Card */
.glass-card {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
}

/* ========== NAVBAR ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: var(--transition);
}

.navbar.scrolled {
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 14px 0;
  box-shadow: 0 4px 30px rgba(0,0,0,0.2);
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.logo-icon svg {
  display: block;
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--white);
  letter-spacing: 2px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  color: rgba(255,255,255,0.85);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 50px;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--white);
  background: rgba(255,255,255,0.12);
}

.nav-link.nav-cta {
  background: linear-gradient(135deg, var(--aqua), var(--primary-dark));
  color: var(--white);
  padding: 8px 20px;
  font-weight: 600;
}

.nav-link.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-blue);
  background: linear-gradient(135deg, var(--primary-light), var(--primary-dark));
}

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: white;
  border-radius: 2px;
  transition: var(--transition);
}

/* ========== HERO SECTION ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: var(--grad-hero);
}

/* Water Wave Animation */
.water-waves {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 200px;
  overflow: hidden;
}

.wave {
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 200%;
  height: 120px;
  border-radius: 50% 50% 0 0 / 80px 80px 0 0;
}

.wave-1 {
  background: rgba(0, 180, 216, 0.15);
  animation: waveMove 8s ease-in-out infinite;
}

.wave-2 {
  background: rgba(0, 150, 199, 0.1);
  animation: waveMove 10s ease-in-out infinite reverse;
  animation-delay: -2s;
}

.wave-3 {
  background: rgba(91, 111, 122, 0.08);
  animation: waveMove 12s ease-in-out infinite;
  animation-delay: -4s;
  bottom: -20px;
}

@keyframes waveMove {
  0%, 100% { transform: translateX(0) scaleY(1); }
  50% { transform: translateX(-25%) scaleY(1.1); }
}

/* Particles */
.particles {
  position: absolute;
  inset: 0;
}

/* Bubbles */
.bubbles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.bubble {
  position: absolute;
  border-radius: 50%;
  background: rgba(144, 224, 239, 0.2);
  border: 1px solid rgba(255,255,255,0.3);
  animation: bubbleRise linear infinite;
}

@keyframes bubbleRise {
  0% { transform: translateY(0) scale(1); opacity: 0.8; }
  100% { transform: translateY(-110vh) scale(0.5); opacity: 0; }
}

.hero-container {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 120px 24px 100px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 180, 216, 0.2);
  border: 1px solid rgba(0, 180, 216, 0.4);
  color: var(--aqua-light);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero-badge i {
  color: var(--green-light);
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 800;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  color: rgba(255,255,255,0.75);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 520px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, var(--aqua) 0%, var(--primary-dark) 100%);
  color: var(--white);
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0, 180, 216, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(0, 119, 182, 0.5);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: var(--white);
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid rgba(255,255,255,0.4);
  transition: var(--transition);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.7);
  transform: translateY(-3px);
}

/* Hero Stats */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.stat-card {
  padding: 16px 12px;
  border-radius: var(--border-radius-sm);
  text-align: center;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  backdrop-filter: blur(10px);
}

.stat-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--white);
  display: inline;
}

.stat-unit {
  font-size: 0.9rem;
  color: var(--aqua-light);
  font-weight: 600;
  display: inline;
}

.stat-label {
  font-size: 0.72rem;
  color: rgba(255,255,255,0.65);
  margin-top: 4px;
  line-height: 1.3;
}

/* Hero Visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-device {
  position: relative;
}

.device-outer {
  position: relative;
  padding: 30px;
  border-radius: 24px;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.2);
  backdrop-filter: blur(20px);
}

.device-label {
  text-align: center;
  font-family: var(--font-heading);
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  font-size: 1.1rem;
  margin-bottom: 12px;
  letter-spacing: 2px;
}

.device-illustration {
  width: 260px;
  height: 340px;
  position: relative;
}

.septra-svg {
  width: 100%;
  height: 100%;
}

.bubble-svg {
  animation: bubbleSvg 3s ease-in-out infinite;
}

.bubble-svg:nth-child(2) { animation-delay: 0.5s; }
.bubble-svg:nth-child(3) { animation-delay: 1s; }
.bubble-svg:nth-child(4) { animation-delay: 1.5s; }
.bubble-svg:nth-child(5) { animation-delay: 2s; }

@keyframes bubbleSvg {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(-8px); opacity: 1; }
}

/* Floating Cards */
.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(15px);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 50px;
  padding: 8px 16px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.float-card i {
  font-size: 0.9rem;
}

.float-card-1 {
  top: -10px;
  right: -30px;
  animation: floatY 4s ease-in-out infinite;
}

.float-card-2 {
  bottom: 40px;
  left: -40px;
  animation: floatY 5s ease-in-out infinite 1s;
}

.float-card-3 {
  bottom: -10px;
  right: -20px;
  animation: floatY 3.5s ease-in-out infinite 0.5s;
}

.float-card-1 i { color: var(--aqua-light); }
.float-card-2 i { color: #B0C4CC; }
.float-card-3 i { color: var(--yellow); }

@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.6);
  font-size: 0.8rem;
  cursor: pointer;
  animation: bounce 2s infinite;
}

.scroll-arrow {
  font-size: 1rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ========== TRUST STRIP ========== */
.trust-strip {
  background: linear-gradient(90deg, #0A1628 0%, #023E8A 60%, #2C3E50 100%);
  padding: 18px 0;
}

.trust-items {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: rgba(255,255,255,0.85);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 24px;
  white-space: nowrap;
}

.trust-item i {
  color: var(--aqua-light);
  font-size: 1rem;
}

.trust-divider {
  width: 1px;
  height: 30px;
  background: rgba(255,255,255,0.2);
}

/* ========== SECTION HEADERS ========== */
.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 60px;
}

.section-header.left {
  text-align: left;
  margin: 0 0 36px;
}

.section-tag {
  display: inline-block;
  background: linear-gradient(135deg, rgba(0,180,216,0.15), rgba(91,111,122,0.15));
  border: 1px solid rgba(0,180,216,0.3);
  color: var(--primary-light);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.section-tag.light {
  background: rgba(255,255,255,0.15);
  border-color: rgba(255,255,255,0.3);
  color: var(--aqua-light);
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-title.white { color: var(--white); }

.section-subtitle {
  color: var(--gray-500);
  font-size: 1.05rem;
  line-height: 1.7;
}

/* ========== BENEFITS SECTION ========== */
.benefits {
  background: var(--off-white);
}

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.benefit-card {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 32px 28px;
  transition: var(--transition);
  position: relative;
  border: 1px solid var(--gray-100);
  overflow: hidden;
}

.benefit-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-primary);
  opacity: 0;
  transition: var(--transition);
}

.benefit-card:hover::before {
  opacity: 1;
}

.benefit-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.benefit-card.featured {
  background: linear-gradient(135deg, #F0F6FB, #E8F0F7);
  border-color: rgba(91,111,122,0.2);
}

.benefit-card.featured::before {
  background: linear-gradient(135deg, #5B6F7A, #3D4F58);
  opacity: 1;
}

.benefit-icon-wrap {
  position: relative;
  display: inline-block;
  margin-bottom: 20px;
}

.benefit-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  color: var(--white);
  position: relative;
  z-index: 1;
  box-shadow: 0 4px 16px rgba(0, 119, 182, 0.3);
}

.benefit-icon.aqua {
  background: linear-gradient(135deg, var(--aqua), var(--primary-light));
  box-shadow: 0 4px 16px rgba(0, 180, 216, 0.3);
}

.benefit-icon.green {
  background: linear-gradient(135deg, #5B6F7A, #3D4F58);
  box-shadow: 0 4px 16px rgba(91,111,122,0.3);
}

.benefit-icon.yellow {
  background: linear-gradient(135deg, var(--yellow), #D97706);
  box-shadow: 0 4px 16px rgba(244, 185, 66, 0.3);
}

.benefit-icon.purple {
  background: linear-gradient(135deg, var(--purple), #5B4391);
  box-shadow: 0 4px 16px rgba(123, 94, 167, 0.3);
}

.benefit-icon.teal {
  background: linear-gradient(135deg, #4A7F9B, #2C5F75);
  box-shadow: 0 4px 16px rgba(74,127,155,0.3);
}

.benefit-icon-bg {
  position: absolute;
  top: -4px;
  left: -4px;
  width: 64px;
  height: 64px;
  border-radius: 20px;
  background: rgba(0,119,182,0.1);
  transition: var(--transition);
}

.benefit-icon-bg.aqua { background: rgba(0,180,216,0.1); }
.benefit-icon-bg.green { background: rgba(91,111,122,0.1); }
.benefit-icon-bg.yellow { background: rgba(244,185,66,0.1); }
.benefit-icon-bg.purple { background: rgba(123,94,167,0.1); }
.benefit-icon-bg.teal { background: rgba(74,127,155,0.1); }

.benefit-card:hover .benefit-icon-bg {
  transform: scale(1.2) rotate(10deg);
  opacity: 0.6;
}

.benefit-card h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--gray-900);
  margin-bottom: 12px;
}

.benefit-card p {
  color: var(--gray-500);
  font-size: 0.9rem;
  line-height: 1.65;
  margin-bottom: 20px;
}

.benefit-footer {
  margin-top: auto;
}

.benefit-highlight {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary);
  background: rgba(0,119,182,0.08);
  padding: 4px 12px;
  border-radius: 50px;
}

.benefit-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: #5B6F7A;
  color: white;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ========== HOW IT WORKS ========== */
.how-it-works {
  background: var(--white);
  position: relative;
}

.section-bg-shape {
  position: absolute;
  top: -100px;
  left: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,180,216,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.process-flow {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 64px;
}

.process-step {
  position: relative;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 900;
  background: linear-gradient(135deg, rgba(0,180,216,0.3), rgba(45,155,78,0.3));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  flex-shrink: 0;
  width: 70px;
}

.step-card {
  flex: 1;
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  padding: 24px;
  backdrop-filter: none;
  transition: var(--transition);
}

.step-card:hover {
  background: var(--white);
  border-color: var(--aqua-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.step-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  margin-bottom: 14px;
}

.step-icon.aqua { background: linear-gradient(135deg, var(--aqua), var(--primary-light)); }
.step-icon.green { background: linear-gradient(135deg, #5B6F7A, #3D4F58); }
.step-icon.teal { background: linear-gradient(135deg, #4A7F9B, #2C5F75); }

.step-card h3 {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.step-card p {
  color: var(--gray-500);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.step-progress {
  background: var(--gray-100);
  border-radius: 50px;
  height: 8px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  border-radius: 50px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  font-size: 0.7rem;
  color: transparent;
  position: relative;
  transition: width 1.5s ease;
}

.progress-bar.aqua { background: linear-gradient(90deg, var(--primary-light), var(--aqua)); }
.progress-bar.green { background: linear-gradient(90deg, #5B6F7A, #8DA5B0); }
.progress-bar.teal { background: linear-gradient(90deg, #4A7F9B, #8DA5B0); }

/* SBR Block */
.sbr-block {
  background: linear-gradient(135deg, #EFF6FF, #F0F4F8);
  border-radius: var(--border-radius-lg);
  padding: 56px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  border: 1px solid rgba(0,119,182,0.1);
}

.sbr-badge {
  display: inline-block;
  background: var(--primary);
  color: white;
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.sbr-content h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.sbr-content p {
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 24px;
}

.sbr-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.sbr-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--gray-700);
  font-weight: 500;
}

.sbr-features li i {
  color: #5B6F7A;
  font-size: 0.9rem;
}

/* Cycle Diagram */
.cycle-diagram {
  position: relative;
  width: 280px;
  height: 280px;
  margin: 0 auto;
}

.cycle-ring {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  border: 2px solid rgba(0,119,182,0.2);
  transform: translate(-50%, -50%);
}

.cycle-ring.outer {
  width: 260px;
  height: 260px;
  border-color: rgba(0,180,216,0.2);
  animation: spin 20s linear infinite;
  border-style: dashed;
}

.cycle-ring.inner {
  width: 180px;
  height: 180px;
  border-color: rgba(45,155,78,0.2);
  animation: spin 15s linear infinite reverse;
  border-style: dashed;
}

@keyframes spin {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

.cycle-steps {
  position: absolute;
  inset: 0;
}

.cycle-step {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 70px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  transform-origin: 0 0;
  transform: rotate(calc(var(--angle) - 90deg)) translateX(120px) rotate(calc(-1 * (var(--angle) - 90deg)));
  margin-top: -35px;
  margin-left: -35px;
}

.cycle-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 10px rgba(0,119,182,0.5);
}

.cycle-dot.aqua {
  background: var(--aqua);
  box-shadow: 0 0 10px rgba(0,180,216,0.5);
}

.cycle-dot.green {
  background: #5B6F7A;
  box-shadow: 0 0 10px rgba(91,111,122,0.5);
}

.cycle-dot.yellow {
  background: var(--yellow);
  box-shadow: 0 0 10px rgba(244,185,66,0.5);
}

.cycle-dot.teal {
  background: #4A7F9B;
  box-shadow: 0 0 10px rgba(74,127,155,0.5);
}

.cycle-step span {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--gray-700);
  text-align: center;
  white-space: nowrap;
}

.cycle-center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
}

.cycle-center span {
  display: block;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--primary);
}

.cycle-center small {
  display: block;
  font-size: 0.75rem;
  color: var(--gray-500);
}

/* ========== MODELS SECTION ========== */
.models {
  background: var(--off-white);
}

.models-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 56px;
}

.model-card {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 32px 28px;
  border: 2px solid var(--gray-100);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.model-card::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--grad-primary);
  opacity: 0;
  transition: var(--transition);
}

.model-card:hover::after {
  opacity: 1;
}

.model-card:hover {
  border-color: var(--aqua-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-8px);
}

.model-card.popular {
  border-color: var(--aqua);
  background: linear-gradient(135deg, #F0F9FF, #FFFFFF);
  box-shadow: 0 8px 40px rgba(0,180,216,0.15);
}

.model-card.popular::after {
  opacity: 1;
  background: linear-gradient(90deg, var(--aqua), var(--primary-dark));
}

.popular-label {
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--aqua), var(--primary-dark));
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 18px;
  border-radius: 0 0 12px 12px;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 4px;
}

.model-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-top: 16px;
}

.model-badge {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--gray-900);
  letter-spacing: 1px;
}

.model-users {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--gray-100);
  padding: 6px 12px;
  border-radius: 50px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--gray-700);
}

.model-users i { color: var(--primary-light); }

/* Tank Visual */
.model-visual {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}

.model-tank {
  position: relative;
  border-radius: 12px;
  border: 2px solid rgba(0,119,182,0.3);
  background: linear-gradient(135deg, #0077B6, #3D4F58);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
}

.model-tank.small { width: 80px; height: 110px; }
.model-tank.medium { width: 110px; height: 140px; }
.model-tank.large { width: 140px; height: 160px; }

.tank-water {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 65%;
  background: linear-gradient(0deg, rgba(0,180,216,0.7), rgba(0,150,199,0.4));
  border-radius: 0;
  animation: waterLevel 4s ease-in-out infinite;
}

@keyframes waterLevel {
  0%, 100% { height: 65%; }
  50% { height: 70%; }
}

.tank-lid {
  position: absolute;
  top: -8px;
  left: 20%;
  width: 60%;
  height: 18px;
  background: linear-gradient(135deg, #90E0EF, #0096C7);
  border-radius: 6px;
  border: 2px solid rgba(255,255,255,0.4);
}

.tank-pipe {
  position: absolute;
  background: rgba(255,255,255,0.4);
  border-radius: 4px;
}

.tank-pipe.inlet {
  left: -10px;
  top: 20%;
  width: 14px;
  height: 8px;
}

.tank-pipe.outlet {
  right: -10px;
  bottom: 35%;
  width: 14px;
  height: 8px;
}

/* Model Specs */
.model-specs {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}

.spec-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--gray-100);
  font-size: 0.875rem;
}

.spec-item:last-child { border-bottom: none; }

.spec-label { color: var(--gray-500); }

.spec-value {
  font-weight: 600;
  color: var(--gray-900);
}

.model-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 12px;
  border-radius: 12px;
  background: var(--gray-100);
  color: var(--gray-700);
  font-weight: 600;
  font-size: 0.875rem;
  transition: var(--transition);
}

.model-btn:hover {
  background: var(--grad-primary);
  color: white;
  transform: translateY(-2px);
}

.model-btn.featured {
  background: linear-gradient(135deg, var(--aqua), var(--primary-dark));
  color: white;
  box-shadow: 0 4px 20px rgba(0,180,216,0.3);
}

.model-btn.featured:hover {
  box-shadow: 0 8px 30px rgba(0,180,216,0.5);
  transform: translateY(-2px);
}

/* Comparison Table */
.comparison-block {
  background: var(--white);
  border-radius: var(--border-radius);
  padding: 40px;
  border: 1px solid var(--gray-100);
}

.comparison-block h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 24px;
}

.table-wrap {
  overflow-x: auto;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.comparison-table th {
  background: var(--gray-50);
  padding: 14px 18px;
  text-align: left;
  font-family: var(--font-heading);
  font-weight: 700;
  color: var(--gray-700);
  border-bottom: 2px solid var(--gray-200);
}

.comparison-table th.highlight-col {
  background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(45,155,78,0.1));
  color: var(--primary);
}

.comparison-table td {
  padding: 12px 18px;
  border-bottom: 1px solid var(--gray-100);
  color: var(--gray-700);
}

.comparison-table td.highlight-col {
  background: rgba(0,180,216,0.05);
  font-weight: 600;
  color: var(--primary-dark);
}

.comparison-table tr:last-child td { border-bottom: none; }

/* ========== INSTALLATION SECTION ========== */
.installation {
  background: var(--white);
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 56px;
}

.install-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  position: relative;
}

.install-step:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 28px;
  right: -8%;
  width: 16%;
  height: 2px;
  background: linear-gradient(90deg, var(--aqua), var(--green));
  opacity: 0.4;
}

.install-num {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: white;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(0,119,182,0.3);
  flex-shrink: 0;
}

.install-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.install-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--primary);
}

.install-icon.aqua { background: rgba(0,180,216,0.1); color: var(--aqua); }
.install-icon.green { background: rgba(91,111,122,0.12); color: #5B6F7A; }
.install-icon.yellow { background: rgba(244,185,66,0.1); color: var(--yellow); }

.install-content h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--gray-900);
}

.install-content p {
  font-size: 0.82rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* Service Grid */
.service-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  padding: 28px 22px;
  text-align: center;
  transition: var(--transition);
  backdrop-filter: none;
}

.service-card:hover {
  background: var(--white);
  border-color: var(--aqua-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

.service-card > i {
  font-size: 2rem;
  background: linear-gradient(135deg, var(--aqua), #5B6F7A);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
  display: block;
}

.service-card h3 {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 10px;
}

.service-card p {
  font-size: 0.82rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ========== ECOLOGY SECTION ========== */
.ecology {
  background: linear-gradient(135deg, #0D2137 0%, #023E8A 60%, #2C3E50 100%);
  position: relative;
  overflow: hidden;
}

.ecology-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.ecology-shape-1 {
  position: absolute;
  top: -150px;
  right: -150px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0,180,216,0.2) 0%, transparent 70%);
}

.ecology-shape-2 {
  position: absolute;
  bottom: -200px;
  left: -100px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(91,111,122,0.2) 0%, transparent 70%);
}

.ecology-layout {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.ecology-text {
  color: rgba(255,255,255,0.75);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 40px;
}

.ecology-stats {
  display: flex;
  gap: 32px;
  margin-bottom: 40px;
}

.eco-stat {}

.eco-stat-num {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--aqua-light), #B0C4CC);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 6px;
}

.eco-stat-label {
  color: rgba(255,255,255,0.65);
  font-size: 0.82rem;
  line-height: 1.3;
}

.cert-list h3 {
  color: rgba(255,255,255,0.9);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 16px;
}

.cert-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cert-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.8);
  font-size: 0.9rem;
}

.cert-item i {
  color: #90E0EF;
  font-size: 0.9rem;
  flex-shrink: 0;
}

/* Earth Globe */
.earth-globe {
  position: relative;
  width: 320px;
  height: 320px;
  margin: 0 auto;
}

.globe-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 200px;
  height: 200px;
}

.globe-svg {
  width: 100%;
  height: 100%;
  animation: globeRotate 20s linear infinite;
}

@keyframes globeRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,0.2);
}

.orbit-1 {
  width: 280px;
  height: 280px;
  margin: -140px;
  animation: orbitRotate1 8s linear infinite;
}

.orbit-2 {
  width: 240px;
  height: 240px;
  margin: -120px;
  animation: orbitRotate2 12s linear infinite reverse;
}

.orbit-3 {
  width: 320px;
  height: 320px;
  margin: -160px;
  animation: orbitRotate3 16s linear infinite;
}

@keyframes orbitRotate1 {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes orbitRotate2 {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes orbitRotate3 {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.orbit-icon {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.8rem;
  backdrop-filter: blur(10px);
}

/* ========== FAQ SECTION ========== */
.faq {
  background: var(--off-white);
}

.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  max-width: 960px;
  margin: 0 auto;
}

.faq-item {
  background: var(--white);
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--aqua-light);
  box-shadow: var(--shadow-sm);
}

.faq-item.active {
  border-color: var(--primary-light);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  cursor: pointer;
  user-select: none;
}

.faq-question span {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--gray-900);
  line-height: 1.4;
}

.faq-question i {
  color: var(--gray-400);
  transition: var(--transition);
  flex-shrink: 0;
  font-size: 0.85rem;
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer p {
  padding: 0 22px 20px;
  color: var(--gray-500);
  font-size: 0.875rem;
  line-height: 1.7;
  border-top: 1px solid var(--gray-100);
  padding-top: 16px;
}

/* ========== CONTACT SECTION ========== */
.contact {
  background: var(--white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 56px;
  align-items: flex-start;
}

/* Contact Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--border-radius-sm);
  font-family: var(--font-body);
  font-size: 0.9rem;
  color: var(--gray-900);
  background: var(--gray-50);
  transition: var(--transition);
  outline: none;
  resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary-light);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(0,150,199,0.1);
}

.form-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px;
  border-radius: var(--border-radius-sm);
  background: linear-gradient(135deg, var(--aqua), var(--primary-dark));
  color: white;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  margin-top: 4px;
}

.form-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0,180,216,0.4);
}

.form-note {
  text-align: center;
  font-size: 0.78rem;
  color: var(--gray-400);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.form-success {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 10px;
  background: #F0F4F8;
  border: 1px solid #5B6F7A;
  color: #3D4F58;
  padding: 14px;
  border-radius: var(--border-radius-sm);
  font-weight: 500;
}

.form-success.visible {
  display: flex;
}

.form-success i { font-size: 1.2rem; }

/* Contact Info */
.contact-info-card {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  padding: 32px;
  margin-bottom: 20px;
  backdrop-filter: none;
}

.contact-info-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 24px;
}

.info-items {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 28px;
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.info-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.info-icon.aqua { background: linear-gradient(135deg, var(--aqua), var(--primary-light)); }
.info-icon.green { background: linear-gradient(135deg, #5B6F7A, #3D4F58); }
.info-icon.yellow { background: linear-gradient(135deg, var(--yellow), #D97706); }

.info-label {
  font-size: 0.75rem;
  color: var(--gray-500);
  margin-bottom: 2px;
}

.info-value {
  font-weight: 600;
  color: var(--gray-900);
  font-size: 0.9rem;
}

.social-links {
  display: flex;
  gap: 10px;
}

.social-link {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-size: 0.9rem;
  transition: var(--transition);
}

.social-link:hover {
  background: var(--primary);
  color: white;
  transform: translateY(-3px);
}

.social-link.viber:hover { background: #7360F2; }
.social-link.telegram:hover { background: #0088CC; }

/* Map Block */
.map-block {
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--border-radius);
  overflow: hidden;
  margin-bottom: 20px;
  padding: 0;
  height: 140px;
  position: relative;
  backdrop-filter: none;
}

.map-placeholder {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #EFF6FF, #F0FDF4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.map-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(rgba(0,119,182,0.1) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,119,182,0.1) 1px, transparent 1px);
  background-size: 30px 30px;
}

.map-pin {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
}

.map-pin i {
  font-size: 2rem;
  color: var(--primary);
  filter: drop-shadow(0 4px 8px rgba(0,119,182,0.4));
}

.map-pin span {
  background: white;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--gray-700);
  box-shadow: var(--shadow-sm);
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, var(--aqua), var(--primary-dark));
  border-radius: var(--border-radius-sm);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  color: white;
}

.cta-banner > i {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.cta-banner strong {
  display: block;
  font-size: 0.9rem;
  font-weight: 700;
}

.cta-banner span {
  display: block;
  font-size: 0.78rem;
  opacity: 0.85;
}

/* ========== FOOTER ========== */
.footer {
  background: var(--dark);
}

.footer-top {
  padding: 64px 0 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}

.footer-brand .nav-logo {
  margin-bottom: 16px;
  display: inline-flex;
}

.footer-tagline {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  line-height: 1.7;
  max-width: 280px;
}

.footer-nav h4 {
  color: rgba(255,255,255,0.9);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 16px;
  letter-spacing: 0.5px;
}

.footer-nav ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-nav ul li a {
  color: rgba(255,255,255,0.5);
  font-size: 0.875rem;
  transition: var(--transition);
}

.footer-nav ul li a:hover {
  color: var(--aqua-light);
}

.footer-bottom {
  padding: 20px 0;
}

.footer-bottom-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.footer-bottom p,
.footer-meta {
  color: rgba(255,255,255,0.4);
  font-size: 0.8rem;
}

.footer-meta i { color: #FF6B6B; }

/* ========== SCROLL TOP BUTTON ========== */
.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 999;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--aqua), var(--primary-dark));
  color: white;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,180,216,0.4);
  opacity: 0;
  transform: translateY(20px);
  transition: var(--transition);
  pointer-events: none;
}

.scroll-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

.scroll-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,180,216,0.5);
}

/* ========== PARTICLES ========== */
.particle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .models-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto 56px; }
  .install-steps { grid-template-columns: repeat(2, 1fr); }
  .install-step::after { display: none; }
  .service-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .sbr-block { grid-template-columns: 1fr; }
  .cycle-diagram { margin: 0 auto; }
  .process-flow { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 64px 0;
  }

  .navbar {
    padding: 16px 0;
  }

  .nav-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(10,22,40,0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    z-index: 999;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-link {
    font-size: 1.1rem;
    padding: 12px 24px;
  }

  .burger {
    display: flex;
    z-index: 1000;
  }

  .burger.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .burger.active span:nth-child(2) {
    opacity: 0;
  }

  .burger.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero-container {
    grid-template-columns: 1fr;
    padding: 100px 24px 80px;
    gap: 40px;
  }

  .hero-visual {
    display: none;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-primary, .btn-outline {
    justify-content: center;
  }

  .benefits-grid { grid-template-columns: 1fr; }

  .trust-items {
    gap: 4px;
    justify-content: flex-start;
    padding: 0 8px;
  }

  .trust-divider { display: none; }
  .trust-item { padding: 6px 12px; }

  .sbr-block { padding: 32px 24px; }

  .ecology-layout { grid-template-columns: 1fr; gap: 40px; }
  .ecology-visual { display: none; }

  .faq-grid { grid-template-columns: 1fr; }

  .contact-grid { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  .install-steps { grid-template-columns: 1fr; }
  .service-grid { grid-template-columns: 1fr 1fr; }

  .comparison-block { padding: 24px 16px; }

  .ecology-stats { flex-wrap: wrap; gap: 20px; }
}

@media (max-width: 480px) {
  .hero-stats { grid-template-columns: repeat(2, 1fr); }
  .stat-num { font-size: 1.6rem; }
  .service-grid { grid-template-columns: 1fr; }
  .trust-item span { display: none; }
  .trust-item i { font-size: 1.2rem; }
  .trust-items { gap: 16px; }
}

/* ========== AOS Overrides ========== */
[data-aos] {
  pointer-events: none;
}

[data-aos].aos-animate {
  pointer-events: auto;
}

/* ========== Scrollbar ========== */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--primary-light), #5B6F7A);
  border-radius: 3px;
}