/* =============================================
   TR Group Inc. US — Main Stylesheet
   ============================================= */

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

:root {
  --color-primary: #106f83;
  --color-primary-dark: #0a5466;
  --color-primary-light: #e8f4f7;
  --color-secondary: #045cb4;
  --color-text: #1e293b;
  --color-text-muted: #334155;
  --color-border: #d1d5db;
  --color-bg: #ffffff;
  --color-bg-alt: #f0f5fa;
  --color-white: #ffffff;
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 6px 24px rgba(0,0,0,0.14);
  --transition: 0.2s ease;
  --container-width: 1160px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading); }

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* --- Layout --- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 64px 0; }
.section-alt { background: var(--color-bg-alt); }

.section-title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  color: var(--color-text);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.site-logo img { height: 44px; width: auto; }

.logo-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.logo-text span {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 8px;
}

.site-nav a {
  display: block;
  padding: 8px 14px;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text);
  border-radius: var(--radius);
  transition: background var(--transition), color var(--transition);
}

.site-nav a:hover,
.site-nav a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* --- Simplified Header (contact/ad landing) --- */
.header-simplified {
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.header-simplified .header-inner {
  justify-content: center;
}

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: 96px 0;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-text { max-width: 560px; }

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.75);
  margin-bottom: 16px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
  color: #fff;
}

.hero-sub {
  font-size: 1.05rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.75;
}

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

.hero-image {
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image img {
  border-radius: var(--radius);
  max-height: 420px;
  object-fit: contain;
}

.hero-brands {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.2);
  flex-wrap: wrap;
}

.hero-brands-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.6);
  white-space: nowrap;
}

.hero-brands img {
  height: 28px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.8;
}

/* --- Buttons --- */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); text-decoration: none; }

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

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

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

.btn-outline-white {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.6);
}
.btn-outline-white:hover {
  background: rgba(255,255,255,0.15);
  color: #fff;
  text-decoration: none;
}

.btn-link { color: var(--color-primary); font-weight: 600; font-size: 0.9rem; }

.btn-lg { padding: 16px 36px; font-size: 1rem; }

/* --- Card Grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 28px;
}

.categories .card-grid,
.card-grid.categories {
  grid-template-columns: repeat(3, 1fr);
  max-width: 1040px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .categories .card-grid,
  .card-grid.categories { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 580px) {
  .categories .card-grid,
  .card-grid.categories { grid-template-columns: 1fr; }
}

/* --- Category Cards --- */
.category-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  color: var(--color-text);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.category-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  border-color: var(--color-primary);
  text-decoration: none;
  color: var(--color-text);
}

.card-icon {
  width: 100%;
  height: 200px;
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 4px;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.3s ease;
}

.category-card:hover .card-icon img {
  transform: scale(1.05);
}

.card-icon-placeholder {
  font-size: 3rem;
  opacity: 0.4;
}

.category-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
}

.category-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.category-card .card-arrow {
  margin-top: auto;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* --- Product Cards --- */
.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  color: var(--color-text);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  text-decoration: none;
  color: var(--color-text);
}

.product-card-image {
  height: 220px;
  overflow: hidden;
  background: var(--color-bg-alt);
}

.product-card-image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 12px;
  transition: transform 0.3s ease;
}

.product-card:hover .product-card-image img { transform: scale(1.04); }

.product-card-body {
  padding: 20px;
  flex: 1;
}

.product-card-body h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.product-card-body p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.product-card-footer {
  padding: 12px 20px 20px;
  border-top: 1px solid var(--color-border);
}

/* --- Features Grid --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 32px;
}

.feature {
  text-align: center;
  padding: 24px;
}

.feature-icon { font-size: 2.4rem; margin-bottom: 16px; }

.feature h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--color-primary);
}

.feature p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.6; }

/* --- Brand Bar --- */
.brand-bar {
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.brand-bar-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
}

.brand-bar-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.brand-bar img {
  height: 32px;
  width: auto;
  object-fit: contain;
  opacity: 0.7;
  transition: opacity var(--transition);
  filter: grayscale(30%);
}

.brand-bar img:hover { opacity: 1; filter: none; }

/* --- CTA Strip --- */
.cta-strip {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 40px 0;
  text-align: center;
}

.cta-strip .container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.cta-strip p { font-size: 1.1rem; }

/* --- Page Hero --- */
.page-hero {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  padding: 48px 0 36px;
}

.page-hero h1 { font-size: 2.2rem; font-weight: 700; color: var(--color-text); }
.page-hero-sub { margin-top: 12px; font-size: 1.05rem; color: var(--color-text-muted); max-width: 640px; }

.breadcrumb { font-size: 0.9rem; color: var(--color-text-muted); margin-bottom: 8px; }
.breadcrumb a { color: var(--color-primary); }

/* --- Product Layout --- */
.product-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.product-gallery { position: sticky; top: 80px; }

.product-main-image {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.product-thumbs {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.product-thumb {
  width: 72px;
  height: 72px;
  object-fit: cover;
  border-radius: 6px;
  border: 2px solid var(--color-border);
  cursor: pointer;
  transition: border-color var(--transition);
}

.product-thumb:hover { border-color: var(--color-primary); }
.product-thumb.active { border-color: var(--color-primary); box-shadow: 0 0 0 2px var(--color-primary); }

.product-info { display: flex; flex-direction: column; gap: 24px; }

.page-actions { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 24px; }

/* --- Specs Table --- */
.specs-table { margin-bottom: 24px; }
.specs-table h2 { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.specs-table h3 { font-size: 1rem; font-weight: 700; margin: 16px 0 8px; }

.specs-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.specs-table th,
.specs-table td {
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.specs-table th {
  background: var(--color-bg-alt);
  font-weight: 600;
  width: 40%;
  color: var(--color-text-muted);
}

.feature-list { padding-left: 20px; }
.feature-list li { margin-bottom: 6px; font-size: 0.9rem; }

/* --- Prose --- */
.prose h2 { font-size: 1.5rem; font-weight: 700; margin: 36px 0 14px; color: var(--color-text); }
.prose h3 { font-size: 1.2rem; font-weight: 700; margin: 24px 0 10px; color: var(--color-text); }
.prose h4 { font-size: 1rem; font-weight: 700; margin: 18px 0 8px; }
.prose p { margin-bottom: 16px; line-height: 1.75; }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 16px; }
.prose li { margin-bottom: 6px; line-height: 1.6; }
.prose strong { font-weight: 700; }
.prose a { color: var(--color-primary); }
.prose a:hover { text-decoration: underline; }

.prose table { width: 100%; border-collapse: collapse; margin-bottom: 20px; font-size: 0.95rem; }
.prose table th, .prose table td { padding: 10px 14px; text-align: left; border: 1px solid var(--color-border); }
.prose table thead th { background: var(--color-bg-alt); font-weight: 600; }
.prose table tbody tr:nth-child(even) td,
.prose table tbody tr:nth-child(even) th { background: var(--color-bg-alt); }

.page-content { max-width: 820px; }

/* --- Comparison Table --- */
.comparison-table-wrap { max-width: 100%; }
.comparison-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.comparison-table th,
.comparison-table td { padding: 10px 14px; text-align: left; border: 1px solid var(--color-border); }
.comparison-table thead th { background: var(--color-primary); color: #fff; font-weight: 600; }
.comparison-table tbody tr:nth-child(even) td { background: var(--color-bg-alt); }
.comparison-table tbody tr:hover td { background: var(--color-primary-light); }
.comparison-table thead th a { color: #fff; text-decoration: underline; }
.comparison-table td a { color: var(--color-primary); font-weight: 500; }
.comparison-table td strong { color: var(--color-primary-dark); }

/* Pillar page styles */
.pillar-toc {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px 28px;
  margin-bottom: 40px;
}

.pillar-toc h3 {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.pillar-toc ol {
  padding-left: 20px;
  margin: 0;
}

.pillar-toc li { margin-bottom: 6px; font-size: 0.92rem; }
.pillar-toc a { color: var(--color-primary); }

/* --- Contact Form --- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}

.contact-info h2 { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; }
.contact-info p { font-size: 0.95rem; color: var(--color-text-muted); margin-bottom: 12px; line-height: 1.7; }

.contact-detail {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.contact-detail-icon { font-size: 1.1rem; margin-top: 1px; }

.trust-signals {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
}

.trust-signals h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.trust-logos {
  display: flex;
  gap: 20px;
  align-items: center;
  flex-wrap: wrap;
}

.trust-logos img {
  height: 28px;
  width: auto;
  opacity: 0.7;
  filter: grayscale(20%);
}

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-weight: 600; font-size: 0.9rem; margin-bottom: 6px; }

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: var(--font-family);
  font-size: 0.95rem;
  transition: border-color var(--transition);
  background: var(--color-white);
  color: var(--color-text);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(16, 111, 131, 0.12);
}

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

/* Ad landing page contact form */
.contact-landing {
  max-width: 680px;
  margin: 0 auto;
}

.contact-landing-header {
  text-align: center;
  margin-bottom: 40px;
}

.contact-landing-header h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 12px;
}

.contact-landing-header p {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* --- Product Downloads --- */
.product-downloads {
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
  margin-top: 8px;
}

.product-downloads h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.download-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.download-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-bg-alt);
  transition: background var(--transition), border-color var(--transition);
}

.download-link:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  text-decoration: none;
}

.download-icon { font-size: 1.1rem; }

.product-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* --- Reference Card (Rebotec) --- */
.reference-card {
  border: 2px solid var(--color-primary);
  border-radius: var(--radius);
  padding: 32px;
  background: var(--color-primary-light);
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.reference-card h2 { margin-bottom: 12px; font-size: 1.4rem; }
.reference-card p { color: var(--color-text-muted); margin-bottom: 24px; line-height: 1.7; }

/* --- Resources --- */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 28px;
}

.resource-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  color: var(--color-text);
  text-decoration: none;
  transition: box-shadow var(--transition), transform var(--transition);
}

.resource-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  text-decoration: none;
  color: var(--color-text);
}

.resource-card-type {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
}

.resource-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
}

.resource-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  flex: 1;
}

.resource-card-cta {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-primary);
}

/* --- Footer --- */
.site-footer {
  background: #1e293b;
  color: #cbd5e1;
  padding: 56px 0 28px;
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand strong { color: var(--color-white); font-size: 1.05rem; display: block; margin-bottom: 12px; }
.footer-brand p { font-size: 0.87rem; line-height: 1.7; margin-bottom: 4px; }
.footer-brand a { color: #94a3b8; }
.footer-brand a:hover { color: var(--color-white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-bottom p { font-size: 0.82rem; color: #64748b; }
.footer-bottom a { color: #64748b; }
.footer-bottom a:hover { color: #94a3b8; }

.footer-nav h4 { color: var(--color-white); font-size: 0.95rem; margin-bottom: 14px; font-weight: 600; }
.footer-nav ul { list-style: none; }
.footer-nav li { margin-bottom: 8px; }
.footer-nav a { font-size: 0.87rem; color: #94a3b8; }
.footer-nav a:hover { color: var(--color-white); text-decoration: none; }

.footer-note p { font-size: 0.82rem; color: #64748b; line-height: 1.7; margin-bottom: 6px; }

/* --- Responsive --- */
@media (max-width: 900px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-image { display: none; }
  .hero { padding: 72px 0; }
}

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

  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    display: none;
    z-index: 99;
  }

  .site-nav.open { display: block; }
  .site-nav ul { flex-direction: column; padding: 12px 16px 20px; gap: 4px; }
  .site-nav a { padding: 12px 16px; }

  .hero { padding: 56px 0; }
  .section { padding: 48px 0; }

  .product-layout { grid-template-columns: 1fr; }
  .product-gallery { position: static; }

  .contact-layout { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .cta-strip .container { flex-direction: column; gap: 16px; text-align: center; }

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

  .hero-brands { gap: 16px; }
}

@media (max-width: 480px) {
  .card-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: flex-start; }
}