*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --ink: #1E293B;
  --graphite: #475569;
  --light-bg: #F1F5F9;
  --orange: #D97706;
  --gray: #94A3B8;
  --gray-light: #CBD5E1;
  --white: #FFFFFF;
  --charcoal: #64748B;
  --accent-hover: #B45309;
  --border: #E2E8F0;
  --dark: #475569;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.3s ease;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
  --container: 1200px;
  --glass-bg: rgba(241,245,249,0.7);
  --glass-bg-warm: rgba(255,247,237,0.85);
  --glass-border: rgba(148,163,184,0.25);
  --glass-border-warm: rgba(217,119,6,0.3);
  --glass-shadow: 0 4px 20px rgba(0,0,0,0.05);
  --glass-blur: 14px;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--graphite);
  background: var(--white);
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

ul, ol {
  list-style: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 80px 0;
}

.section-light {
  background: var(--light-bg);
}

.section-label {
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--orange);
  margin-bottom: 12px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--ink);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 18px;
  color: var(--gray);
  max-width: 680px;
  line-height: 1.6;
}

.text-center {
  text-align: center;
}

.text-center .section-subtitle {
  margin: 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font);
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1.2;
  white-space: nowrap;
}

.btn-primary {
  background: var(--orange);
  color: var(--white);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--ink);
}

.btn-secondary:hover {
  background: var(--ink);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--charcoal);
  border: 2px solid var(--charcoal);
}

.btn-outline:hover {
  background: var(--charcoal);
  color: var(--white);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 14px;
}

/* ===== ENGINEERING PATTERNS ===== */
.eng-pattern {
  position: relative;
}

.eng-pattern::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cpath d='M10 10 L190 10 M10 30 L190 30 M10 50 L190 50 M10 70 L190 70 M10 90 L190 90 M10 110 L190 110 M10 130 L190 130 M10 150 L190 150 M10 170 L190 170 M10 190 L190 190' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Cpath d='M10 10 L10 190 M30 10 L30 190 M50 10 L50 190 M70 10 L70 190 M90 10 L90 190 M110 10 L110 190 M130 10 L130 190 M150 10 L150 190 M170 10 L170 190 M190 10 L190 190' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Crect x='40' y='40' width='40' height='30' rx='2' stroke='%23475569' stroke-width='0.7' fill='none'/%3E%3Ccircle cx='60' cy='55' r='8' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Cpath d='M120 40 L160 40 L140 70 Z' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Cpath d='M40 120 L80 120 L60 150 Z' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Crect x='110' y='110' width='50' height='40' rx='3' stroke='%23475569' stroke-width='0.7' fill='none'/%3E%3Cpath d='M135 130 L135 150 M120 140 L150 140' stroke='%23475569' stroke-width='0.4' fill='none'/%3E%3C/svg%3E");
  background-size: 280px 280px;
  background-repeat: repeat;
}

.eng-pattern > * {
  position: relative;
  z-index: 1;
}

.eng-pattern-light::before {
  opacity: 0.025;
}

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--white);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--ink);
  flex-shrink: 0;
}

.logo svg {
  display: block;
}

.logo span {
  color: var(--orange);
}

.logo-sub {
  font-size: 10px;
  font-weight: 500;
  color: var(--gray);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: block;
  margin-top: -2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  font-size: 14px;
  font-weight: 500;
  color: var(--graphite);
  position: relative;
}

.nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transition: var(--transition);
}

.nav a:hover::after,
.nav a.active::after {
  transform: scaleX(1);
}

.nav a:hover {
  color: var(--orange);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-phone {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.header-phone:hover {
  color: var(--orange);
}

.header-phone span {
  display: none;
}

.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ink);
  transition: var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== HERO ===== */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(160deg, #F8FAFC 0%, #E2E8F0 100%);
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cline x1='20' y1='20' x2='280' y2='20' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='50' x2='280' y2='50' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='80' x2='280' y2='80' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='110' x2='280' y2='110' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='140' x2='280' y2='140' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='170' x2='280' y2='170' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='200' x2='280' y2='200' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='230' x2='280' y2='230' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='260' x2='280' y2='260' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='290' x2='280' y2='290' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='20' y1='20' x2='20' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='60' y1='20' x2='60' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='100' y1='20' x2='100' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='140' y1='20' x2='140' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='180' y1='20' x2='180' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='220' y1='20' x2='220' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Cline x1='260' y1='20' x2='260' y2='280' stroke='%23475569' stroke-width='0.5'/%3E%3Crect x='70' y='70' width='60' height='40' rx='2' stroke='%23475569' stroke-width='0.6' fill='none'/%3E%3Ccircle cx='100' cy='90' r='10' stroke='%23475569' stroke-width='0.4' fill='none'/%3E%3Cpath d='M170 70 L230 70 L200 110 Z' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Crect x='70' y='160' width='80' height='50' rx='3' stroke='%23475569' stroke-width='0.7' fill='none'/%3E%3Cpath d='M110 180 L110 210 M90 195 L130 195' stroke='%23475569' stroke-width='0.3' fill='none'/%3E%3Cpath d='M190 180 L230 180 L210 210 Z' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3C/svg%3E");
  background-size: 350px 350px;
  background-repeat: repeat;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(217, 119, 6, 0.15);
  border: 1px solid rgba(217, 119, 6, 0.3);
  padding: 6px 16px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--orange);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-title span {
  color: var(--orange);
}

.hero-desc {
  font-size: 18px;
  line-height: 1.7;
  color: var(--graphite);
  margin-bottom: 32px;
  max-width: 540px;
}

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

.hero-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.hero-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--graphite);
}

.hero-feature svg {
  flex-shrink: 0;
  color: var(--orange);
}

.hero-visual {
  position: relative;
  z-index: 1;
}

.hero-image {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 11;
}

.hero-image video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  position: absolute;
  inset: 0;
}

/* ===== STATS ===== */
.stats {
  padding: 60px 0;
  background: var(--white);
  border-bottom: 1px solid var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 32px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-size: 40px;
  font-weight: 800;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-number span {
  color: var(--orange);
}

.stat-label {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.4;
}

/* ===== SERVICES ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  box-shadow: var(--glass-shadow);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--orange);
  transform: scaleX(0);
  transition: var(--transition);
}

.service-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--glass-border-warm);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(217, 119, 6, 0.1);
  border-radius: var(--radius);
  margin-bottom: 20px;
  color: var(--orange);
}

.service-card-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
}

.service-card-desc {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
  margin-bottom: 20px;
}

.service-card-link {
  font-size: 14px;
  font-weight: 600;
  color: var(--charcoal);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.service-card-link:hover {
  color: var(--orange);
  gap: 8px;
}

/* ===== SOLUTIONS ===== */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.solution-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: var(--transition);
  cursor: default;
  box-shadow: var(--glass-shadow);
}

.solution-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  border-color: var(--glass-border-warm);
  transform: translateY(-3px);
}

.solution-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--light-bg);
  border-radius: 50%;
  color: var(--charcoal);
}

.solution-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.solution-desc {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.5;
}

/* ===== WHY US ===== */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 48px;
}

.why-item {
  display: flex;
  gap: 20px;
}

.why-number {
  font-size: 48px;
  font-weight: 800;
  color: rgba(217, 119, 6, 0.15);
  line-height: 1;
  flex-shrink: 0;
}

.why-content h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.why-content p {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
}

/* ===== STAGES ===== */
.stages {
  position: relative;
}

.stages-timeline {
  position: relative;
  margin-top: 48px;
  padding-left: 40px;
}

.stages-timeline::before {
  content: '';
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--gray-light);
}

.stage-item {
  position: relative;
  padding-bottom: 36px;
}

.stage-item:last-child {
  padding-bottom: 0;
}

.stage-dot {
  position: absolute;
  left: -33px;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--orange);
  border: 4px solid var(--white);
  box-shadow: 0 0 0 2px var(--orange);
}

.stage-number {
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.stage-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.stage-desc {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
  max-width: 600px;
}

/* ===== BOILER TYPES ===== */
.boiler-types-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 48px;
}

.boiler-type-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.boiler-type-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  border-color: var(--glass-border-warm);
  transform: translateY(-3px);
}

.boiler-type-icon {
  font-size: 28px;
  margin-bottom: 12px;
  color: var(--orange);
}

.boiler-type-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.boiler-type-desc {
  font-size: 12px;
  color: var(--gray);
  line-height: 1.5;
}

/* ===== PROJECTS/CASES ===== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.project-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.project-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--glass-border-warm);
}

.project-image {
  height: 220px;
  background: var(--graphite);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.3);
  position: relative;
  overflow: hidden;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.project-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: var(--orange);
  color: var(--white);
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 600;
}

.project-body {
  padding: 24px;
}

.project-meta {
  display: flex;
  gap: 16px;
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--gray);
}

.project-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.project-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.project-task {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.5;
  margin-bottom: 16px;
}

.project-result {
  font-size: 13px;
  font-weight: 600;
  color: var(--charcoal);
  display: flex;
  align-items: center;
  gap: 4px;
}

.project-result::before {
  content: '✓';
  color: var(--orange);
  font-weight: 700;
}

/* ===== DOCUMENTS ===== */
.documents-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.doc-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.doc-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  border-color: var(--glass-border-warm);
  transform: translateY(-3px);
}

.doc-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: var(--light-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--charcoal);
}

.doc-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 12px;
}

.doc-download {
  font-size: 13px;
  font-weight: 500;
  color: var(--orange);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.doc-download:hover {
  color: var(--accent-hover);
}

/* ===== EQUIPMENT ===== */
.equipment-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
  margin-top: 48px;
}

.equipment-item {
  text-align: center;
  padding: 20px 12px;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.equipment-item:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  border-color: var(--glass-border-warm);
  transform: translateY(-3px);
}

.equipment-icon {
  font-size: 28px;
  margin-bottom: 10px;
  color: var(--charcoal);
}

.equipment-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 800px;
  margin: 48px auto 0;
}

.faq-item {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.faq-item:hover {
  background: var(--glass-bg-warm);
  border-color: var(--glass-border-warm);
}

.faq-question {
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  background: transparent;
  transition: var(--transition);
  user-select: none;
}

.faq-question:hover {
  background: var(--light-bg);
}

.faq-item.active .faq-question {
  background: var(--light-bg);
}

.faq-toggle {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
  color: var(--orange);
}

.faq-item.active .faq-toggle {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  padding: 0 24px;
}

.faq-item.active .faq-answer {
  max-height: 300px;
  padding: 0 24px 20px;
}

.faq-answer p {
  font-size: 15px;
  color: var(--gray);
  line-height: 1.7;
}

/* ===== FINAL CTA ===== */
.cta-final {
  background: linear-gradient(160deg, #F1F5F9 0%, #E2E8F0 100%);
  color: var(--ink);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.cta-final::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(217, 119, 6, 0.06);
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
  position: relative;
  z-index: 1;
}

.cta-title {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-desc {
  font-size: 16px;
  color: var(--graphite);
  line-height: 1.7;
  margin-bottom: 32px;
}

.cta-contacts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.cta-contact {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
  color: var(--graphite);
}

.cta-contact svg {
  flex-shrink: 0;
  color: var(--orange);
}

.cta-contact a {
  color: var(--ink);
  font-weight: 600;
}

.cta-contact a:hover {
  color: var(--orange);
}

/* ===== FORM ===== */
.cta-form {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
}

.cta-form-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 24px;
}

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

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-group .required::after {
  content: '*';
  color: var(--orange);
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
  transition: var(--transition);
  outline: none;
}

.form-control:focus {
  border-color: var(--charcoal);
  box-shadow: 0 0 0 3px rgba(68,64,60,0.1);
}

.form-control::placeholder {
  color: var(--gray-light);
}

textarea.form-control {
  resize: vertical;
  min-height: 100px;
}

.form-file {
  padding: 10px 0;
}

.form-file input[type="file"] {
  font-size: 14px;
  color: var(--gray);
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 20px;
}

.form-checkbox input[type="checkbox"] {
  margin-top: 3px;
  flex-shrink: 0;
  width: 16px;
  height: 16px;
}

.form-checkbox label {
  font-size: 13px;
  color: var(--gray);
  line-height: 1.5;
}

.form-checkbox a {
  color: var(--charcoal);
  text-decoration: underline;
}

.form-submit {
  width: 100%;
  justify-content: center;
  padding: 16px 32px;
  font-size: 16px;
}

.form-hint {
  font-size: 13px;
  color: var(--gray);
  text-align: center;
  margin-top: 12px;
}

.form-success {
  display: none;
  text-align: center;
  padding: 40px 20px;
}

.form-success.show {
  display: block;
}

.form-success-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 16px;
  background: rgba(34, 197, 94, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #22C55E;
}

.form-success-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.form-success-desc {
  font-size: 15px;
  color: var(--gray);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--light-bg);
  color: var(--ink);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid var(--border);
}

.footer-about .logo {
  color: var(--ink);
  margin-bottom: 16px;
}

.footer-about p {
  font-size: 14px;
  color: var(--charcoal);
  line-height: 1.7;
  margin-bottom: 20px;
}

.footer-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--ink);
}

.footer-nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-nav a {
  font-size: 14px;
  color: var(--graphite);
  font-weight: 500;
}

.footer-nav a:hover {
  color: var(--orange);
}

.footer-contacts {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-contact {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: 14px;
  color: var(--charcoal);
  line-height: 1.5;
}

.footer-contact svg {
  flex-shrink: 0;
  color: var(--orange);
  margin-top: 2px;
}

.footer-contact a {
  color: var(--ink);
  font-weight: 500;
}

.footer-contact a:hover {
  color: var(--orange);
}

.footer-bottom {
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--charcoal);
}

.footer-bottom a {
  color: var(--charcoal);
}

.footer-bottom a:hover {
  color: var(--orange);
}

/* ===== PAGE HEADER ===== */
.page-header {
  padding: 120px 0 60px;
  background: linear-gradient(160deg, #F8FAFC 0%, #E2E8F0 100%);
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cline x1='10' y1='10' x2='190' y2='10' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='30' x2='190' y2='30' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='50' x2='190' y2='50' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='70' x2='190' y2='70' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='90' x2='190' y2='90' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='110' x2='190' y2='110' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='130' x2='190' y2='130' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='150' x2='190' y2='150' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='170' x2='190' y2='170' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='190' x2='190' y2='190' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='10' x2='10' y2='190' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='110' y1='10' x2='110' y2='190' stroke='%23475569' stroke-width='0.4'/%3E%3Crect x='30' y='30' width='50' height='35' rx='2' stroke='%23475569' stroke-width='0.6' fill='none'/%3E%3Ccircle cx='55' cy='47' r='7' stroke='%23475569' stroke-width='0.3' fill='none'/%3E%3Cpath d='M120 30 L170 30 L145 65 Z' stroke='%23475569' stroke-width='0.5' fill='none'/%3E%3Crect x='30' y='110' width='60' height='45' rx='3' stroke='%23475569' stroke-width='0.6' fill='none'/%3E%3Cpath d='M55 130 L55 155 M40 142 L70 142' stroke='%23475569' stroke-width='0.3' fill='none'/%3E%3C/svg%3E");
  background-size: 250px 250px;
  background-repeat: repeat;
}

.page-header-title {
  font-size: 40px;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.page-header-desc {
  font-size: 18px;
  color: var(--graphite);
  max-width: 640px;
  position: relative;
  z-index: 1;
}

.breadcrumbs {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.breadcrumbs a {
  color: var(--charcoal);
}

.breadcrumbs a:hover {
  color: var(--orange);
}

.breadcrumbs span {
  color: var(--ink);
}

/* ===== CONTENT PAGE ===== */
.content-section {
  padding: 60px 0;
}

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

.content-body h2 {
  font-size: 28px;
  font-weight: 700;
  color: var(--ink);
  margin-top: 40px;
  margin-bottom: 16px;
}

.content-body h2:first-child {
  margin-top: 0;
}

.content-body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin-top: 32px;
  margin-bottom: 12px;
}

.content-body p {
  font-size: 16px;
  color: var(--graphite);
  line-height: 1.7;
  margin-bottom: 16px;
}

.content-body ul,
.content-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.content-body ul li,
.content-body ol li {
  font-size: 15px;
  color: var(--graphite);
  line-height: 1.7;
  margin-bottom: 8px;
  position: relative;
}

.content-body ul li::before {
  content: '';
  position: absolute;
  left: -18px;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--orange);
  border-radius: 50%;
}

.content-sidebar {
  position: sticky;
  top: 100px;
  align-self: start;
}

.sidebar-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  margin-bottom: 24px;
  box-shadow: var(--glass-shadow);
}

.sidebar-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 16px;
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-list a {
  font-size: 14px;
  color: var(--gray);
  padding: 8px 12px;
  border-radius: var(--radius);
  transition: var(--transition);
}

.sidebar-list a:hover,
.sidebar-list a.active {
  background: var(--white);
  color: var(--charcoal);
  font-weight: 500;
}

/* ===== PROJECTS PAGE ===== */
.filters {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font);
  border: 1px solid var(--border);
  border-radius: 100px;
  background: var(--white);
  color: var(--gray);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--charcoal);
  border-color: var(--charcoal);
  color: var(--white);
}

/* ===== DOCUMENTS PAGE ===== */
.documents-page-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.doc-page-card {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.doc-page-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  border-color: var(--glass-border-warm);
  transform: translateY(-3px);
}

.doc-page-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
  background: var(--light-bg);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--charcoal);
}

.doc-page-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.doc-page-count {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 16px;
}

.doc-page-btn {
  font-size: 14px;
  font-weight: 600;
  color: var(--orange);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===== BLOG ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.blog-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  transition: var(--transition);
  box-shadow: var(--glass-shadow);
}

.blog-card:hover {
  background: var(--glass-bg-warm);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--glass-border-warm);
}

.blog-image {
  height: 200px;
  background: var(--light-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-light);
}

.blog-body {
  padding: 24px;
}

.blog-meta {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 8px;
}

.blog-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
  display: block;
}

.blog-title:hover {
  color: var(--orange);
}

.blog-excerpt {
  font-size: 14px;
  color: var(--gray);
  line-height: 1.6;
  margin-bottom: 16px;
}

.blog-read {
  font-size: 14px;
  font-weight: 600;
  color: var(--charcoal);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* ===== CONTACTS PAGE ===== */
.contacts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contacts-info {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.contacts-block h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

.contacts-block p {
  font-size: 15px;
  color: var(--gray);
  line-height: 1.7;
}

.contacts-block a {
  color: var(--charcoal);
  font-weight: 500;
}

.contacts-block a:hover {
  color: var(--orange);
}

.contacts-map {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  height: 400px;
  background: var(--light-bg);
  position: relative;
  cursor: pointer;
}

.contacts-map iframe {
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
}

.contacts-map.active iframe {
  pointer-events: auto;
}

.map-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(15, 23, 42, 0.03);
  color: var(--gray);
  font-size: 14px;
  font-weight: 500;
  z-index: 2;
  transition: opacity 0.3s;
  pointer-events: none;
}

.contacts-map.active .map-overlay {
  opacity: 0;
  visibility: hidden;
}

/* ===== ARTICLE PAGE ===== */
.article-header {
  padding: 120px 0 40px;
  background: linear-gradient(160deg, #F8FAFC 0%, #E2E8F0 100%);
  color: var(--ink);
  position: relative;
  overflow: hidden;
}

.article-header::before {
  content: '';
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cline x1='10' y1='10' x2='190' y2='10' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='30' x2='190' y2='30' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='50' x2='190' y2='50' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='70' x2='190' y2='70' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='90' x2='190' y2='90' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='110' x2='190' y2='110' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='130' x2='190' y2='130' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='150' x2='190' y2='150' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='170' x2='190' y2='170' stroke='%23475569' stroke-width='0.4'/%3E%3Cline x1='10' y1='190' x2='190' y2='190' stroke='%23475569' stroke-width='0.4'/%3E%3Cpath d='M30 30 L80 30 L55 65 Z' stroke='%23475569' stroke-width='0.6' fill='none'/%3E%3Crect x='110' y='40' width='60' height='40' rx='2' stroke='%23475569' stroke-width='0.6' fill='none'/%3E%3Ccircle cx='140' cy='60' r='8' stroke='%23475569' stroke-width='0.3' fill='none'/%3E%3C/svg%3E");
  background-size: 250px 250px;
  background-repeat: repeat;
}

.article-meta {
  font-size: 13px;
  color: var(--gray);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.article-title {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.article-desc {
  font-size: 16px;
  color: var(--graphite);
  max-width: 700px;
  position: relative;
  z-index: 1;
}

.article-content {
  padding: 48px 0;
}

.article-body {
  max-width: 780px;
  margin: 0 auto;
}

.article-body h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--ink);
  margin-top: 40px;
  margin-bottom: 16px;
}

.article-body h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink);
  margin-top: 32px;
  margin-bottom: 12px;
}

.article-body p {
  font-size: 16px;
  color: var(--graphite);
  line-height: 1.8;
  margin-bottom: 16px;
}

.article-body ul,
.article-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.article-body ul li,
.article-body ol li {
  font-size: 15px;
  color: var(--graphite);
  line-height: 1.7;
  margin-bottom: 8px;
  position: relative;
}

.article-body ul li::before {
  content: '';
  position: absolute;
  left: -18px;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--orange);
  border-radius: 50%;
}

.article-body .highlight-box {
  background: var(--light-bg);
  border-left: 4px solid var(--orange);
  padding: 24px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 24px 0;
}

.article-body .highlight-box p {
  margin-bottom: 0;
  font-size: 15px;
}

.article-body .table-wrap {
  overflow-x: auto;
  margin: 24px 0;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.article-body table th,
.article-body table td {
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--border);
}

.article-body table th {
  background: var(--light-bg);
  font-weight: 600;
  color: var(--ink);
}

.article-body table td {
  color: var(--graphite);
}

.article-body table tr:nth-child(even) td {
  background: var(--light-bg);
}

.article-cta {
  margin-top: 48px;
  padding: 40px;
  background: var(--light-bg);
  border-radius: var(--radius-lg);
  text-align: center;
}

.article-cta h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 12px;
}

.article-cta p {
  font-size: 15px;
  color: var(--gray);
  margin-bottom: 24px;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-title { font-size: 36px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .solutions-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .equipment-grid { grid-template-columns: repeat(3, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .boiler-types-grid { grid-template-columns: repeat(3, 1fr); }
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    padding: 24px 20px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    gap: 16px;
    align-items: stretch;
  }
  .nav.open a { padding: 8px 0; font-size: 16px; }
  .header-actions .btn { display: none; }
  .mobile-toggle { display: flex; }
  .header-phone { font-size: 14px; }
  .hero-grid { grid-template-columns: 1fr; gap: 32px; }
  .hero { padding: 120px 0 60px; }
  .hero-title { font-size: 28px; }
  .hero-desc { font-size: 16px; }
  .hero-features { grid-template-columns: 1fr; }
  .hero-visual { display: none; }
  .section { padding: 60px 0; }
  .section-title { font-size: 26px; }
  .services-grid { grid-template-columns: 1fr; }
  .solutions-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .blog-grid { grid-template-columns: 1fr; }
  .documents-grid { grid-template-columns: repeat(2, 1fr); }
  .equipment-grid { grid-template-columns: repeat(2, 1fr); }
  .cta-grid { grid-template-columns: 1fr; }
  .cta-form { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .stat-number { font-size: 32px; }
  .boiler-types-grid { grid-template-columns: repeat(2, 1fr); }
  .page-header { padding: 100px 0 40px; }
  .page-header-title { font-size: 28px; }
  .article-title { font-size: 28px; }
  .content-grid { grid-template-columns: 1fr; }
  .contacts-grid { grid-template-columns: 1fr; }
  .documents-page-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 24px; }
  .hero-btns { flex-direction: column; }
  .hero-btns .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
  .stat-number { font-size: 28px; }
  .boiler-types-grid { grid-template-columns: 1fr 1fr; }
  .documents-grid { grid-template-columns: 1fr; }
  .article-title { font-size: 24px; }
  .article-cta { padding: 24px; }
  .footer-about .logo svg { width: 180px; height: auto; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.5s; }
.stagger-children.visible > *:nth-child(7) { transition-delay: 0.6s; }
.stagger-children.visible > *:nth-child(8) { transition-delay: 0.7s; }
.stagger-children.visible > *:nth-child(9) { transition-delay: 0.8s; }
.stagger-children.visible > *:nth-child(10) { transition-delay: 0.9s; }

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* ===== ADVANTAGES HIGHLIGHT ===== */
.advantages-highlight {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin: 48px 0;
}

.advantage-block {
  background: var(--glass-bg-warm);
  border: 1px solid var(--glass-border-warm);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  gap: 20px;
  transition: var(--transition);
}

.advantage-block:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.advantage-icon {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  background: rgba(217, 119, 6, 0.15);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--orange);
}

.advantage-body h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 8px;
}

.advantage-body p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--graphite);
  margin-bottom: 12px;
}

.advantage-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 600;
  color: var(--orange);
  text-decoration: none;
}

.advantage-link:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .advantages-highlight {
    grid-template-columns: 1fr;
  }
}