/* ================================================
   TIANHE MANUFACTURING GROUP — Corporate Stylesheet
   Primary: #1857b6 (brand blue from logo)
   Accent:  #cc2200 (brand red from logo)
   ================================================ */

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

:root {
  --blue-dark:    #0c2952;
  --blue-primary: #1857b6;
  --blue-mid:     #2468cc;
  --red-accent:   #cc2200;
  --charcoal:     #1e2328;
  --text-dark:    #1e2328;
  --text-body:    #3d4148;
  --text-muted:   #6b717a;
  --bg-white:     #ffffff;
  --bg-gray:      #f0f1f3;
  --bg-dark:      #141c28;
  --border-light: #d8dadd;
  --border-mid:   #b8bcc4;
  --nav-height:   68px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: Georgia, 'Times New Roman', serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-body);
  background: var(--bg-white);
  min-width: 320px;
}

h1, h2, h3, h4 {
  font-family: 'Arial Narrow', Arial, Helvetica, sans-serif;
  line-height: 1.2;
  color: var(--text-dark);
}

p {
  margin-bottom: 1rem;
}
p:last-child {
  margin-bottom: 0;
}

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

ul {
  list-style: none;
}

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

address {
  font-style: normal;
  line-height: 1.9;
}

/* ---------- LAYOUT ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

.section {
  padding: 80px 0;
}

.section-white { background: var(--bg-white); }
.section-gray  { background: var(--bg-gray); }
.section-dark  { background: var(--bg-dark); }

/* ---------- SECTION HEADERS ---------- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--red-accent);
  margin-bottom: 10px;
}

.section-label-light {
  color: #e87a60;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--blue-dark);
  margin-bottom: 14px;
}

.section-title-light {
  color: #e8edf5;
}

.title-rule {
  width: 56px;
  height: 3px;
  background: var(--blue-primary);
  margin: 0 auto 20px;
}

.title-rule-light {
  background: var(--blue-mid);
}

.section-intro {
  max-width: 720px;
  margin: 0 auto;
  color: var(--text-muted);
  font-size: 1rem;
}

/* ---------- NAVIGATION ---------- */
#site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
}

.navbar {
  background: #fff;
  border-bottom: 3px solid var(--red-accent);
  height: var(--nav-height);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo {
  height: 48px;
  width: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-links li a {
  display: block;
  padding: 8px 18px;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #415b85;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.nav-links li a:hover,
.nav-links li a.active {
  color: var(--blue-primary);
  border-bottom-color: var(--red-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #c8d6ec;
  transition: background 0.15s;
}

.nav-toggle:hover span {
  background: #ffffff;
}

/* ---------- HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  background-image: url('/public/images/pexels-photo-27382424.jpg');
  background-size: cover;
  background-position: center 40%;
  background-repeat: no-repeat;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(12, 41, 82, 0.88) 0%,
    rgba(12, 41, 82, 0.65) 55%,
    rgba(12, 41, 82, 0.40) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 780px;
  padding: 80px 32px 80px 80px;
}

.hero-tagline-bar {
  display: inline-block;
  background: var(--red-accent);
  color: #ffffff;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 5px 14px;
  margin-bottom: 22px;
}

.hero-title {
  font-family: 'Arial Narrow', Arial, Helvetica, sans-serif;
  font-size: 3.4rem;
  font-weight: 700;
  color: #ffffff;
  line-height: 1.1;
  margin-bottom: 16px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.4);
}

.hero-subtitle {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.2rem;
  font-weight: 400;
  color: #a8c4e8;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-rule {
  width: 60px;
  height: 3px;
  background: var(--red-accent);
  margin-bottom: 20px;
}

.hero-desc {
  font-size: 1rem;
  color: #c0d0e4;
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 560px;
}

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

/* ---------- BUTTONS ---------- */
.btn {
  display: inline-block;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 12px 28px;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--blue-primary);
  color: #ffffff;
  border-color: var(--blue-primary);
}

.btn-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
  color: #ffffff;
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255,255,255,0.65);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.12);
  border-color: #ffffff;
  color: #ffffff;
  text-decoration: none;
}

/* ---------- ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 64px;
  align-items: start;
}

.about-text p {
  font-size: 1rem;
  color: var(--text-body);
  margin-bottom: 1.1rem;
}

.about-highlights {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2px;
  border: 1px solid var(--border-light);
}

.highlight-item {
  background: var(--bg-gray);
  border: 1px solid var(--border-light);
  padding: 24px 16px;
  text-align: center;
}

.highlight-number {
  font-family: 'Arial Narrow', Arial, sans-serif;
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--blue-primary);
  line-height: 1;
  margin-bottom: 6px;
}

.highlight-label {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* ---------- PRODUCTS ---------- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 3px solid var(--blue-primary);
  border-left: 1px solid var(--border-light);
}

.product-card {
  border-right: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  background: var(--bg-white);
}

.product-header {
  background: var(--blue-dark);
  padding: 16px 24px;
}

.product-header h3 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: #c8d8f0;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0;
}

.product-body {
  padding: 24px;
}

.product-body p {
  font-size: 0.9rem;
  color: var(--text-body);
  margin-bottom: 14px;
}

.product-body ul {
  list-style: none;
  padding: 0;
}

.product-body ul li {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  color: var(--text-dark);
  padding: 4px 0 4px 16px;
  border-bottom: 1px dotted var(--border-light);
  position: relative;
}

.product-body ul li:last-child {
  border-bottom: none;
}

.product-body ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--blue-primary);
  font-size: 12px;
}

/* ---------- APPLICATIONS ---------- */
.applications-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.app-item {
  background: var(--bg-gray);
  border: 1px solid var(--border-light);
}

.app-img-wrap {
  overflow: hidden;
  height: 240px;
}

.app-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.app-caption {
  padding: 20px 24px;
  border-top: 3px solid var(--blue-primary);
}

.app-caption h4 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: var(--blue-dark);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.app-caption p {
  font-size: 0.875rem;
  color: var(--text-body);
  margin: 0;
  line-height: 1.6;
}

/* ---------- QUALITY ---------- */
.section-dark .section-header {
  text-align: center;
}

.quality-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}

.quality-block {
  border-left: 3px solid var(--blue-primary);
  padding: 24px 28px;
  background: rgba(255,255,255,0.04);
}

.quality-block h3 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 14px;
  font-weight: 700;
  color: #c8d8f0;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 12px;
}

.quality-block p {
  font-size: 0.9rem;
  color: #8a9eb8;
  line-height: 1.75;
  margin: 0;
}

.cert-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0;
  border: 1px solid rgba(255,255,255,0.12);
  background: rgba(24, 87, 182, 0.18);
  padding: 18px 24px;
}

.cert-item {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #a0b8d8;
  padding: 4px 16px;
}

.cert-sep {
  color: rgba(255,255,255,0.2);
  font-size: 16px;
}

/* ---------- CONTACT ---------- */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-block {
  border-top: 3px solid var(--blue-primary);
  padding-top: 28px;
}

.contact-group {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-light);
  align-items: start;
}

.contact-label {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding-top: 2px;
}

.contact-value {
  font-size: 0.95rem;
  color: var(--text-dark);
  line-height: 1.6;
}

.contact-value a {
  color: var(--blue-primary);
}

.contact-value a:hover {
  color: var(--blue-dark);
}

.contact-company-name {
  font-family: 'Arial Narrow', Arial, sans-serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--blue-dark);
}

.contact-address {
  line-height: 1.8;
}

.contact-note-block {
  border-top: 3px solid var(--border-mid);
  padding-top: 28px;
}

.contact-note-block h3 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.hours-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
}

.hours-table td {
  padding: 10px 0;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-body);
}

.hours-table td:last-child {
  font-family: Arial, Helvetica, sans-serif;
  font-weight: 700;
  color: var(--text-dark);
  text-align: right;
}

.contact-note {
  background: var(--bg-gray);
  border-left: 3px solid var(--blue-primary);
  padding: 16px 20px;
}

.contact-note p {
  font-size: 0.875rem;
  color: var(--text-body);
  margin: 0;
  line-height: 1.65;
}

/* ---------- FOOTER ---------- */
.site-footer {
  background: var(--charcoal);
  color: #8a96a8;
  padding: 56px 0 0;
  border-top: 3px solid var(--blue-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
  color: #6a7888;
}

.footer-logo {
  height: 52px;
  width: auto;
  margin-bottom: 20px;
  filter: brightness(0.85);
}

.footer-col h4 {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #c0cad8;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 6px;
}

.footer-col ul li a,
.footer-col address a {
  font-size: 13px;
  color: #6a7888;
  text-decoration: none;
}

.footer-col ul li a:hover,
.footer-col address a:hover {
  color: #a8b8cc;
  text-decoration: none;
}

.footer-col address {
  font-size: 13px;
  color: #6a7888;
  line-height: 1.85;
}

.footer-bottom {
  padding: 20px 0;
  text-align: center;
}

.footer-bottom p {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 12px;
  color: #4a5568;
  margin: 0;
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-highlights {
    max-width: 480px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }

  .section {
    padding: 56px 0;
  }

  .container {
    padding: 0 20px;
  }

  .section-title {
    font-size: 1.6rem;
  }

  /* Mobile nav */
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--blue-dark);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  }

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

  .nav-links li a {
    padding: 14px 24px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    border-left: 3px solid transparent;
  }

  .nav-links li a:hover {
    border-left-color: var(--red-accent);
    border-bottom-color: rgba(255,255,255,0.06);
  }

  .hero-content {
    padding: 60px 20px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

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

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

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

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

  .cert-bar {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .cert-sep {
    display: none;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .contact-group {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-col:not(.footer-brand) {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 24px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .hero-tagline-bar {
    font-size: 9px;
  }

  .hero-actions {
    flex-direction: column;
    gap: 12px;
  }

  .btn {
    text-align: center;
  }

  .about-highlights {
    max-width: 100%;
  }
}