/* Greener Heating modern responsive styles */
:root {
  --bg: #0b1220;
  --card: #0f172a;
  --muted: #94a3b8;
  --text: #e2e8f0;
  --brand: #0ea5e9;
  --brand-2: #10b981;
  --accent: #38bdf8;
  --danger: #ef4444;
  --ring: 0 0 0 3px rgba(14, 165, 233, 0.35);
  --header-height: 70px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, #082f49 0%, transparent 60%),
              radial-gradient(1000px 700px at 110% 10%, #052e2b 0%, transparent 55%),
              linear-gradient(180deg, #0b1220 0%, #0b1220 100%);
  line-height: 1.6;
}

.container {
  max-width: 1152px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Mobile-first responsive container */
@media (min-width: 640px) {
  .container {
    padding: 0 24px;
  }
}

/* Header and Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 18, 32, 0.95);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0;
}

.logo {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1.1rem;
}

.logo img {
  filter: drop-shadow(0 6px 20px rgba(16, 185, 129, 0.35));
  width: 70px;
  height: 35px;
}

/* Mobile Navigation */
.nav-toggle {
  display: block;
  background: transparent;
  border: 0;
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  z-index: 100;
}

.nav-toggle:focus {
  outline: none;
  box-shadow: var(--ring);
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  margin: 5px 0;
  border-radius: 2px;
  transition: all 0.3s ease;
}

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

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

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

.main-nav {
  position: relative;
}

.main-nav ul {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: var(--card);
  flex-direction: column;
  padding: 20px;
  margin: 0;
  list-style: none;
  border-bottom: 1px solid rgba(148, 163, 184, 0.15);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.main-nav ul.open {
  display: flex;
}

.main-nav li {
  margin: 0;
  padding: 0;
}

.main-nav a {
  color: var(--text);
  text-decoration: none;
  padding: 16px 0;
  border-radius: 8px;
  display: block;
  font-weight: 500;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  transition: all 0.2s ease;
}

.main-nav a:hover {
  background: rgba(148, 163, 184, 0.12);
  color: var(--accent);
}

.main-nav .phone a {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  color: #001b1b;
  font-weight: 700;
  padding: 12px 20px;
  border-radius: 8px;
  text-align: center;
  margin-top: 10px;
}

.main-nav .phone a:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* Desktop Navigation */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }
  
  .main-nav ul {
    position: static;
    display: flex;
    flex-direction: row;
    gap: 20px;
    align-items: center;
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
  }
  
  .main-nav a {
    padding: 10px 12px;
    border: none;
  }
  
  .main-nav .phone a {
    margin-top: 0;
  }
}

/* Hero Section */
.hero {
  padding: 60px 0;
  background: radial-gradient(800px 500px at 10% 20%, rgba(56, 189, 248, 0.15), transparent 60%),
              radial-gradient(600px 400px at 90% 10%, rgba(16, 185, 129, 0.12), transparent 60%);
}

@media (min-width: 768px) {
  .hero {
    padding: 80px 0;
  }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 768px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
  }
}

.hero h1 {
  font-size: 2.5rem;
  line-height: 1.1;
  margin: 0 0 20px;
  font-weight: 800;
}

@media (min-width: 640px) {
  .hero h1 {
    font-size: 3rem;
  }
}

@media (min-width: 768px) {
  .hero h1 {
    font-size: 3.5rem;
  }
}

@media (min-width: 1024px) {
  .hero h1 {
    font-size: 4rem;
  }
}

.hero p {
  font-size: 1.1rem;
  color: var(--muted);
  margin: 0 0 30px;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .hero p {
    font-size: 1.2rem;
  }
}

.hero .cta {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 30px;
}

@media (min-width: 640px) {
  .hero .cta {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border-radius: 10px;
  padding: 14px 20px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  text-align: center;
  min-height: 48px;
}

.btn-primary {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  color: #001b1b;
  font-weight: 700;
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(14, 165, 233, 0.3);
}

.btn-secondary {
  background: rgba(148, 163, 184, 0.12);
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.btn-secondary:hover {
  background: rgba(148, 163, 184, 0.2);
  border-color: rgba(148, 163, 184, 0.4);
  transform: translateY(-1px);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.35);
  color: #bbf7d0;
  padding: 10px 16px;
  border-radius: 999px;
  font-weight: 600;
  margin-bottom: 20px;
  font-size: 0.9rem;
}

.trust {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  color: var(--muted);
  margin-top: 20px;
}

@media (min-width: 640px) {
  .trust {
    flex-direction: row;
    align-items: center;
    gap: 20px;
  }
}

.trust img {
  opacity: 0.9;
  filter: grayscale(1) contrast(1.2);
  height: 28px;
  width: auto;
}

/* Grid Layouts */
.grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 640px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background: var(--card);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 14px;
  padding: 24px;
  transition: all 0.2s ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
  border-color: rgba(148, 163, 184, 0.3);
}

.card h3 {
  margin: 0 0 12px;
  font-size: 1.25rem;
  font-weight: 700;
}

.card p {
  color: var(--muted);
  margin: 0;
  line-height: 1.6;
}

.icon {
  width: 48px;
  height: 48px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  font-size: 1.5rem;
  margin-bottom: 16px;
}

/* Sections */
.section {
  padding: 60px 0;
}

@media (min-width: 768px) {
  .section {
    padding: 80px 0;
  }
}

.section h2 {
  font-size: 2rem;
  margin: 0 0 20px;
  font-weight: 800;
  text-align: center;
}

@media (min-width: 768px) {
  .section h2 {
    font-size: 2.5rem;
  }
}

@media (min-width: 1024px) {
  .section h2 {
    font-size: 3rem;
  }
}

.section p.lead {
  color: var(--muted);
  margin: 0 0 30px;
  text-align: center;
  font-size: 1.1rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Pricing Grid */
.price-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

@media (min-width: 768px) {
  .price-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .price-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.price-card {
  padding: 24px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.12), rgba(148, 163, 184, 0.05));
  border: 1px solid rgba(148, 163, 184, 0.25);
  transition: all 0.2s ease;
}

.price-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.price-card h3 {
  margin: 0 0 12px;
  font-size: 1.5rem;
  font-weight: 700;
}

.price {
  font-weight: 800;
  font-size: 2.5rem;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 16px 0;
  line-height: 1;
}

@media (min-width: 768px) {
  .price {
    font-size: 3rem;
  }
}

.price small {
  color: var(--muted);
  font-size: 1rem;
}

.badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
  justify-content: center;
}

.badge {
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 999px;
  padding: 8px 16px;
  color: var(--muted);
  background: rgba(148, 163, 184, 0.08);
  font-size: 0.9rem;
  font-weight: 500;
}

/* Split Layouts */
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

@media (min-width: 768px) {
  .split {
    grid-template-columns: 1fr 1fr;
  }
}

/* Forms */
form {
  display: grid;
  gap: 16px;
  max-width: 600px;
  margin: 0 auto;
}

label {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
  display: block;
}

input, textarea, select {
  background: var(--card);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  transition: all 0.2s ease;
  width: 100%;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  box-shadow: var(--ring);
  border-color: var(--accent);
  transform: translateY(-1px);
}

textarea {
  min-height: 140px;
  resize: vertical;
}

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

@media (min-width: 640px) {
  .form-row {
    grid-template-columns: 1fr 1fr;
  }
}

/* Footer */
.site-footer {
  padding: 40px 0;
  border-top: 1px solid rgba(148, 163, 184, 0.15);
  background: rgba(2, 6, 23, 0.35);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
  }
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer li {
  margin-bottom: 12px;
}

.site-footer a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer a:hover {
  color: var(--accent);
}

.legal {
  color: var(--muted);
  margin-top: 20px;
  text-align: center;
  font-size: 0.9rem;
}

@media (min-width: 768px) {
  .legal {
    text-align: left;
  }
}

/* Decorative Graphics */
.blob {
  position: absolute;
  inset: auto auto -60px -60px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle at 30% 30%, rgba(56, 189, 248, 0.3), transparent 60%), 
              radial-gradient(circle at 70% 70%, rgba(16, 185, 129, 0.35), transparent 60%);
  filter: blur(18px);
  opacity: 0.65;
  border-radius: 50%;
}

.hero-illustration {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: linear-gradient(180deg, rgba(148, 163, 184, 0.1), transparent);
  min-height: 300px;
}

@media (min-width: 768px) {
  .hero-illustration {
    min-height: 400px;
  }
}

.hero-illustration:before {
  content: "";
  display: block;
  padding-top: 70%;
}

.hero-illustration svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* Service page specific styles */
.service-page .card h3 a {
  color: var(--text);
  text-decoration: none;
  transition: color 0.2s ease;
}

.service-page .card h3 a:hover {
  color: var(--accent);
}

.price-highlight {
  background: linear-gradient(180deg, rgba(56, 189, 248, 0.15), rgba(148, 163, 184, 0.08));
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 12px;
  padding: 24px;
  margin: 24px 0;
}

.price-highlight .price {
  margin: 16px 0;
}

.service-page .card .btn {
  margin-top: 16px;
}

/* Mobile-specific improvements */
@media (max-width: 639px) {
  .hero {
    padding: 40px 0;
  }
  
  .section {
    padding: 40px 0;
  }
  
  .card {
    padding: 20px;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .section h2 {
    font-size: 1.75rem;
  }
  
  .container {
    padding: 0 16px;
  }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --muted: #cbd5e1;
    --text: #ffffff;
    --card: #1e293b;
  }
}

/* Print styles */
@media print {
  .site-header,
  .nav-toggle,
  .cta,
  .site-footer {
    display: none !important;
  }
  
  body {
    background: white !important;
    color: black !important;
  }
  
  .card {
    border: 1px solid #ccc !important;
    background: white !important;
  }
}