/* ENGINEERED TEMPERATURE SOLUTIONS LLC — Site 391 */
/* Dark theme with warm orange (#f97316) accents */

:root {
  --bg-primary: #0c0805;
  --bg-secondary: #140f0a;
  --bg-card: #1a130d;
  --orange: #f97316;
  --orange-light: #fb923c;
  --orange-dark: #ea580c;
  --text-primary: #f5f0eb;
  --text-secondary: #b0a8a0;
  --text-muted: #7a736c;
  --border: #2a221c;
  --border-light: #3d332b;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

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

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

ul, ol {
  list-style: none;
}

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

/* ──────── Buttons ──────── */

.btn {
  display: inline-block;
  padding: 14px 34px;
  font-family: var(--font-main);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition);
  letter-spacing: 0.02em;
}

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

.btn-primary:hover {
  background: var(--orange-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(249, 115, 22, 0.3);
}

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

.btn-secondary:hover {
  background: var(--orange);
  color: #fff;
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--orange);
  color: var(--orange);
}

/* ──────── Header / Nav ──────── */

header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 8, 5, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 42px;
  height: 42px;
  background: var(--orange);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  color: #fff;
}

.logo-text {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  line-height: 1.2;
}

.logo-text span {
  display: block;
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

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

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text-primary);
}

.nav-cta {
  margin-left: 8px;
}

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

.hamburger span {
  display: block;
  width: 26px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition);
  border-radius: 2px;
}

/* ──────── Hero ──────── */

.hero {
  padding: 120px 20px 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  padding: 6px 18px;
  background: rgba(249, 115, 22, 0.1);
  border: 1px solid rgba(249, 115, 22, 0.25);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--orange);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  letter-spacing: -0.03em;
}

.hero h1 .highlight {
  background: linear-gradient(135deg, var(--orange), var(--orange-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 650px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ──────── Section ──────── */

.section {
  padding: 90px 20px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

.section-subtitle {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(249, 115, 22, 0.1);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--orange);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* ──────── Cards ──────── */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 36px 30px;
  transition: all var(--transition);
}

.card:hover {
  border-color: var(--orange);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: rgba(249, 115, 22, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: var(--orange);
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

.card-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--orange);
  transition: gap var(--transition);
}

.card:hover .card-arrow {
  gap: 12px;
}

/* ──────── Stats ──────── */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  text-align: center;
}

.stat-item h3 {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--orange);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-item p {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ──────── About Page ──────── */

.about-content {
  max-width: 800px;
  margin: 0 auto;
}

.about-content p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 36px 0 16px;
  color: var(--text-primary);
}

.values-list {
  display: grid;
  gap: 20px;
  margin: 24px 0;
}

.values-list li {
  display: flex;
  gap: 16px;
  padding: 20px 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.values-list li strong {
  color: var(--orange);
  min-width: 100px;
  font-size: 0.9rem;
}

.values-list li span {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* ──────── Services ──────── */

.services-detail {
  max-width: 800px;
  margin: 0 auto;
}

.service-block {
  padding: 36px 30px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: 24px;
}

.service-block h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--orange);
}

.service-block p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.service-block ul {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.service-block ul li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.service-block ul li::before {
  content: '▸';
  color: var(--orange);
  font-weight: 700;
  flex-shrink: 0;
}

/* ──────── Industries ──────── */

.industries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.industry-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 30px 24px;
  text-align: center;
  transition: all var(--transition);
}

.industry-card:hover {
  border-color: var(--orange);
  transform: translateY(-4px);
}

.industry-card .card-icon {
  margin: 0 auto 16px;
}

.industry-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.industry-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ──────── Projects ──────── */

.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: all var(--transition);
}

.project-card:hover {
  border-color: var(--orange);
  transform: translateY(-4px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.project-card-img {
  height: 200px;
  background: linear-gradient(135deg, rgba(249, 115, 22, 0.08), rgba(249, 115, 22, 0.02));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--orange);
  border-bottom: 1px solid var(--border);
}

.project-card-body {
  padding: 24px;
}

.project-card-body .tag {
  display: inline-block;
  padding: 3px 10px;
  background: rgba(249, 115, 22, 0.1);
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--orange);
  margin-bottom: 10px;
}

.project-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: 8px;
}

.project-card-body p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.6;
}

/* ──────── Legal Pages ──────── */

.legal-content {
  max-width: 850px;
  margin: 0 auto;
}

.legal-content h1 {
  font-size: 2.4rem;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.legal-content .last-updated {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 40px;
}

.legal-content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 36px 0 14px;
  color: var(--text-primary);
}

.legal-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 28px 0 10px;
  color: var(--text-primary);
}

.legal-content p {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.legal-content ul, .legal-content ol {
  margin: 12px 0 20px 20px;
}

.legal-content ul li, .legal-content ol li {
  color: var(--text-secondary);
  font-size: 0.98rem;
  line-height: 1.8;
  margin-bottom: 6px;
}

.legal-content ul li::marker {
  color: var(--orange);
}

.legal-content ol li::marker {
  color: var(--orange);
  font-weight: 600;
}

.legal-content strong {
  color: var(--text-primary);
}

.legal-content .info-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--orange);
  border-radius: 8px;
  padding: 20px 24px;
  margin: 20px 0;
}

.legal-content .info-box p {
  margin-bottom: 0;
}

/* ──────── Contact / CTA ──────── */

.cta-section {
  text-align: center;
  padding: 80px 20px;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 400px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.04) 0%, transparent 70%);
  pointer-events: none;
}

.cta-section h2 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.cta-section p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 550px;
  margin: 0 auto 32px;
}

.contact-details {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.contact-item .icon {
  color: var(--orange);
  font-size: 1.2rem;
}

/* ──────── Footer ──────── */

footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 20px 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 12px;
  line-height: 1.7;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.footer-col a {
  display: block;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 10px;
  transition: color var(--transition);
}

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

.footer-bottom {
  max-width: var(--max-width);
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* ──────── Page Header ──────── */

.page-header {
  padding: 100px 20px 60px;
  text-align: center;
  position: relative;
}

.page-header::before {
  content: '';
  position: absolute;
  top: -30%;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(249, 115, 22, 0.05) 0%, transparent 70%);
  pointer-events: none;
}

.page-header h1 {
  font-size: 2.8rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ──────── Responsive ──────── */

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .page-header h1 {
    font-size: 2.2rem;
  }

  .section-header h2 {
    font-size: 2rem;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 20px;
    gap: 16px;
  }

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

  .nav-links a {
    font-size: 1rem;
  }

  .nav-cta {
    margin-left: 0;
    width: 100%;
  }

  .nav-cta .btn {
    width: 100%;
    text-align: center;
  }

  .hero {
    padding: 80px 20px 60px;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero p {
    font-size: 1rem;
  }

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

  .stat-item h3 {
    font-size: 2rem;
  }

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

  .page-header h1 {
    font-size: 1.8rem;
  }

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

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

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

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

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.6rem;
  }

  .section-header h2 {
    font-size: 1.5rem;
  }

  .btn {
    padding: 12px 24px;
    font-size: 0.85rem;
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .contact-details {
    flex-direction: column;
    align-items: center;
  }
}

/* ──────── Animations ──────── */

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

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ──────── Skip link ──────── */

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  padding: 12px 24px;
  background: var(--orange);
  color: #fff;
  border-radius: 6px;
  font-weight: 600;
  z-index: 1000;
  transition: top 0.3s;
}

.skip-link:focus {
  top: 16px;
}

/* ──────── Scrollbar ──────── */

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}