/* =============================================================
   ProLine Heaters — Shared stylesheet
   Color system:
     navy 900:  #081a2e  (footer, stat strip bg)
     navy 800:  #0e2a44  (brand primary, text)
     navy 600:  #1a4775  (hero gradient end)
     navy 300:  #7eb9f0  (small labels on navy)
     navy 100:  #c8d6e6  (body on navy)
     grey 100:  #f5f6f8  (page bg)
     grey 200:  #e4e6ea  (borders)
     grey 500:  #6a7280  (body text)
     accent:    #c0392b  (red accent line)
   ============================================================= */

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  color: #0e2a44;
  background: #f5f6f8;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============ NAV BAR ============ */
.site-nav {
  background: #ffffff;
  border-bottom: 1px solid #e4e6ea;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-logo img {
  height: 72px;
  width: auto;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  font-size: 14px;
  font-weight: 600;
  color: #6a7280;
  transition: color 0.15s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: #0e2a44;
}
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}
.btn-primary {
  background: #0e2a44;
  color: #ffffff;
  border-color: #0e2a44;
}
.btn-primary:hover { background: #1a4775; border-color: #1a4775; }
.btn-white {
  background: #ffffff;
  color: #0e2a44;
  border-color: #ffffff;
}
.btn-white:hover { background: transparent; color: #ffffff; }
.btn-outline-white {
  background: transparent;
  color: #ffffff;
  border-color: #ffffff;
}
.btn-outline-white:hover { background: #ffffff; color: #0e2a44; }

/* ============ HERO ============ */
.hero {
  background: linear-gradient(135deg, #0e2a44 0%, #1a4775 100%);
  color: #ffffff;
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}
.hero-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}
.hero-eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  color: #7eb9f0;
  margin: 0 0 24px;
  text-transform: uppercase;
}
.hero h1 {
  font-size: clamp(36px, 5vw, 54px);
  font-weight: 700;
  line-height: 1.08;
  margin: 0 0 24px;
}
.hero-subtext {
  font-size: 17px;
  color: #c8d6e6;
  margin: 0 0 32px;
  max-width: 520px;
}
.hero-ctas {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.hero-decoration {
  display: flex;
  flex-direction: column;
  gap: 24px;
  opacity: 0.18;
}
.hero-decoration .pill {
  height: 50px;
  border-radius: 25px;
  background: #ffffff;
}

/* ============ STAT STRIP ============ */
.stat-strip {
  background: #081a2e;
  color: #ffffff;
  border-top: 3px solid #c0392b;
}
.stat-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  align-items: center;
}
.stat {
  text-align: center;
  position: relative;
}
.stat + .stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10%;
  bottom: 10%;
  width: 1px;
  background: #1a4775;
}
.stat-value {
  font-size: clamp(28px, 3.5vw, 44px);
  font-weight: 700;
  line-height: 1;
  margin: 0 0 8px;
}
.stat-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  color: #7eb9f0;
  text-transform: uppercase;
  margin: 0;
}

/* ============ FEATURES ============ */
.features {
  background: #ffffff;
  padding: 60px 0;
}
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.feature {
  background: #f5f6f8;
  border-radius: 6px;
  padding: 32px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}
.feature-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: #0e2a44;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.feature-title {
  font-size: 16px;
  font-weight: 700;
  color: #0e2a44;
  margin: 0 0 8px;
}
.feature-body {
  font-size: 13px;
  color: #6a7280;
  margin: 0;
  line-height: 1.5;
}

/* ============ SPLIT (product + contact) ============ */
.split {
  background: #f5f6f8;
  padding: 60px 0 80px;
}
.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}
.split-card {
  border-radius: 6px;
  padding: 40px;
  min-height: 340px;
  display: flex;
  flex-direction: column;
}
.split-card.product { background: #ffffff; }
.split-card.contact { background: #0e2a44; color: #ffffff; }
.card-eyebrow {
  font-size: 13px;
  letter-spacing: 3px;
  font-weight: 600;
  text-transform: uppercase;
  margin: 0 0 20px;
}
.card-eyebrow.muted { color: #8a95a6; }
.card-eyebrow.light { color: #7eb9f0; }
.card-heading {
  font-size: 28px;
  font-weight: 700;
  margin: 0 0 16px;
}
.card-body {
  font-size: 14px;
  color: #6a7280;
  margin: 0 0 16px;
  line-height: 1.55;
}
.contact .card-body { color: #c8d6e6; }
.card-link {
  font-size: 13px;
  font-weight: 600;
  color: #0e2a44;
  display: inline-block;
  margin-top: 8px;
  transition: color 0.15s ease;
}
.card-link:hover { color: #1a4775; }
.card-links {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cable-visual {
  height: 70px;
  border-radius: 35px;
  background: linear-gradient(180deg, #d4d8dc 0%, #8a8f94 50%, #4a4e52 100%);
  margin-bottom: 12px;
}
.cable-braid {
  height: 6px;
  background: #b87333;
  margin-bottom: 24px;
}
.email-plate {
  margin-top: auto;
  padding: 18px 20px;
  border-radius: 6px;
  border: 1px solid #7eb9f0;
  background: rgba(255,255,255,0.10);
  font-size: 15px;
  font-weight: 600;
  color: #ffffff;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: background 0.15s ease;
}
.email-plate:hover { background: rgba(255,255,255,0.18); }

/* ============ FOOTER ============ */
.site-footer {
  background: #081a2e;
  color: #7a90aa;
  padding: 48px 0 40px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: start;
}
.footer-brand {
  font-size: 14px;
  font-weight: 700;
  color: #ffffff;
  margin: 0 0 8px;
  letter-spacing: 1px;
}
.footer-tag { font-size: 12px; margin: 0 0 32px; }
.footer-meta { font-size: 12px; margin: 0; }
.footer-right { text-align: right; font-size: 12px; }
.footer-right a { display: block; margin-bottom: 6px; transition: color 0.15s ease; }
.footer-right a:hover { color: #ffffff; }

/* ============ INSTALLATION PAGE ============ */
.page-header {
  background: linear-gradient(135deg, #0e2a44 0%, #1a4775 100%);
  color: #ffffff;
  padding: 72px 0 56px;
}
.page-header h1 {
  font-size: clamp(32px, 4.5vw, 48px);
  font-weight: 700;
  margin: 0 0 12px;
}
.page-header p {
  font-size: 17px;
  color: #c8d6e6;
  margin: 0;
  max-width: 680px;
}
.content-section { padding: 60px 0; background: #ffffff; }
.content-section.alt { background: #f5f6f8; }
.section-eyebrow {
  font-size: 12px;
  letter-spacing: 3px;
  font-weight: 600;
  color: #c0392b;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.section-heading {
  font-size: 32px;
  font-weight: 700;
  color: #0e2a44;
  margin: 0 0 24px;
}
.doc-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 20px;
  margin-top: 32px;
}
.doc-card {
  background: #ffffff;
  border: 1px solid #e4e6ea;
  border-radius: 6px;
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.doc-card:hover {
  border-color: #0e2a44;
  transform: translateY(-2px);
}
.doc-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 6px;
  background: #0e2a44;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 700;
}
.doc-title {
  font-size: 16px;
  font-weight: 700;
  color: #0e2a44;
  margin: 0 0 4px;
}
.doc-meta {
  font-size: 12px;
  color: #6a7280;
  margin: 0 0 8px;
}
.doc-action {
  font-size: 13px;
  font-weight: 600;
  color: #c0392b;
}
.spec-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-top: 32px;
  align-items: start;
}
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.spec-table th, .spec-table td {
  padding: 12px 16px;
  border-bottom: 1px solid #e4e6ea;
  text-align: left;
}
.spec-table th {
  background: #f5f6f8;
  font-weight: 600;
  color: #0e2a44;
  width: 45%;
}
.spec-image {
  background: #f5f6f8;
  border-radius: 6px;
  padding: 24px;
}
.spec-image img {
  width: 100%;
  height: auto;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .nav-inner { padding: 12px 20px; }
  .nav-logo img { height: 52px; }
  .nav-links { display: none; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-decoration { display: none; }
  .hero { padding: 56px 0 72px; }
  .stat-inner { grid-template-columns: 1fr 1fr; gap: 32px 16px; padding: 28px 20px; }
  .stat + .stat::before { display: none; }
  .stat:nth-child(3)::before, .stat:nth-child(4)::before { display: none; }
  .features-grid { grid-template-columns: 1fr; gap: 16px; }
  .features { padding: 40px 0; }
  .split-grid { grid-template-columns: 1fr; }
  .split { padding: 40px 0 56px; }
  .split-card { padding: 28px; min-height: 0; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-right { text-align: left; }
  .spec-grid { grid-template-columns: 1fr; gap: 24px; }
}