/* ============================================
   HVAC Landing Page — StaticForge
   Design: Stripe-inspired (trust, blue, clean)
   Zero JavaScript. Pure HTML + CSS.
   ============================================ */

/* 1. Reset + Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

/* 2. CSS Variables (Stripe-inspired) */
:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-primary-light: #DBEAFE;
  --color-secondary: #0F172A;
  --color-accent: #F59E0B;
  --color-accent-hover: #D97706;
  --color-bg: #FFFFFF;
  --color-surface: #F8FAFC;
  --color-surface-alt: #F1F5F9;
  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-muted: #94A3B8;
  --color-border: #E2E8F0;
  --color-success: #10B981;

  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 2rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
}

/* 3. Typography */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-text);
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

p {
  color: var(--color-text-secondary);
}

.text-accent {
  color: var(--color-primary);
}

/* 4. Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* 5. Components */

/* Buttons */
.cta-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: #FFFFFF;
  padding: 0.875rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1.125rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.cta-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.cta-secondary:hover {
  background: var(--color-primary);
  color: #FFFFFF;
}

.cta-phone {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--color-primary);
  color: #FFFFFF;
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: 1.25rem;
  transition: all 0.2s ease;
  text-decoration: none;
}

.cta-phone:hover {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.cta-full {
  width: 100%;
  justify-content: center;
}

/* Cards */
.card, .service-card, .testimonial-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.service-card:hover, .testimonial-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Forms */
.hidden {
  display: none !important;
}

input, textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}

input::placeholder, textarea::placeholder {
  color: var(--color-muted);
}

.form-group {
  margin-bottom: 1rem;
}

/* Section Headers */
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  margin-bottom: 0.5rem;
}

.section-header p {
  font-size: 1.125rem;
}

/* 6. Sections */

/* Hero */
.hero {
  background: var(--color-bg);
  padding: 4rem 0 3rem;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.hero-badge {
  display: inline-block;
  background: var(--color-primary-light);
  color: var(--color-primary-dark);
  padding: 0.375rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.hero-content h1 {
  margin-bottom: 1rem;
}

.hero-sub {
  font-size: 1.125rem;
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-image-placeholder {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--color-muted);
}

/* Trust */
.trust {
  background: var(--color-surface);
  padding: 2.5rem 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.trust-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
}

.trust-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-top: 0.25rem;
}

/* Services */
.services {
  padding: 5rem 0;
  background: var(--color-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.service-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.service-icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1rem;
}

.service-card h3 {
  margin-bottom: 0.5rem;
}

.service-card p {
  font-size: 0.9375rem;
}

/* About */
.about {
  padding: 5rem 0;
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: center;
}

.about-content h2 {
  margin-bottom: 1rem;
}

.about-content p {
  margin-bottom: 1.5rem;
}

.about-list li {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
  color: var(--color-text);
  font-weight: 500;
}

.about-list svg {
  color: var(--color-success);
  flex-shrink: 0;
}

.about-image-placeholder {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 250px;
  color: var(--color-muted);
}

/* Testimonials */
.testimonials {
  padding: 5rem 0;
  background: var(--color-bg);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.testimonial-card {
  padding: 2rem;
}

.stars {
  color: var(--color-accent);
  font-size: 1.25rem;
  margin-bottom: 1rem;
  letter-spacing: 2px;
}

.testimonial-card p {
  font-size: 1rem;
  font-style: italic;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.testimonial-author {
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.875rem;
}

/* Service Area */
.service-area {
  padding: 4rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.areas-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.areas-list span {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
}

/* Final CTA */
.final-cta {
  padding: 5rem 0;
  background: var(--color-secondary);
  color: #FFFFFF;
}

.final-cta h2 {
  color: #FFFFFF;
  margin-bottom: 1rem;
}

.final-cta p {
  color: #CBD5E1;
  margin-bottom: 2rem;
}

.cta-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}

.cta-form {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.cta-form input, .cta-form textarea {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.15);
  color: #FFFFFF;
}

.cta-form input::placeholder, .cta-form textarea::placeholder {
  color: #94A3B8;
}

.cta-form input:focus, .cta-form textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Footer */
.footer {
  background: #0A0F1A;
  color: #CBD5E1;
  padding: 4rem 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.75rem;
}

.footer-contact h4, .footer-links h4 {
  color: #FFFFFF;
  font-size: 1rem;
  margin-bottom: 1rem;
}

.footer-contact p {
  color: #94A3B8;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  font-size: 0.9375rem;
}

.footer-contact a {
  color: #CBD5E1;
  transition: color 0.2s ease;
}

.footer-contact a:hover {
  color: #FFFFFF;
}

.footer-links ul li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: #94A3B8;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: #FFFFFF;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 1.5rem 0;
  text-align: center;
  font-size: 0.875rem;
  color: #64748B;
}

/* 7. Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.hero-content {
  animation: fadeInUp 0.8s ease-out both;
}

.hero-image {
  animation: fadeIn 1s ease-out 0.3s both;
}

.trust-item {
  animation: fadeInUp 0.6s ease-out both;
}

.trust-item:nth-child(1) { animation-delay: 0.1s; }
.trust-item:nth-child(2) { animation-delay: 0.2s; }
.trust-item:nth-child(3) { animation-delay: 0.3s; }
.trust-item:nth-child(4) { animation-delay: 0.4s; }

/* 8. Responsive */
@media (min-width: 640px) {
  .hero .container {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .hero-image-placeholder {
    min-height: 300px;
  }

  .trust-grid {
    grid-template-columns: repeat(4, 1fr);
  }

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

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

  .testimonials-grid .testimonial-card:last-child {
    grid-column: span 2;
  }
}

@media (min-width: 1024px) {
  .hero {
    padding: 6rem 0 4rem;
  }

  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

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

  .testimonials-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .testimonials-grid .testimonial-card:last-child {
    grid-column: auto;
  }

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

  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr;
  }
}