/* ============================================
   Jinyuan Machinery - Global Stylesheet
   Brand: #0D4C8C (primary) / #DF2127 (accent)
   Fonts: Montserrat (headings) / Inter (body)
   ============================================ */

:root {
  --primary: #0D4C8C;
  --primary-light: #1565C0;
  --primary-dark: #0A3D6B;
  --accent: #DF2127;
  --accent-dark: #B71C1C;
  --text-dark: #1A1A2E;
  --text-gray: #6B7280;
  --text-light: #9CA3AF;
  --bg-light: #F5F7FA;
  --bg-white: #FFFFFF;
  --border: #E0E0E0;
  --success: #27AE60;
  --font-heading: "Montserrat", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;
  --container: 1200px;
  --radius: 8px;
  --shadow: 0 4px 24px rgba(13, 76, 140, 0.08);
  --shadow-hover: 0 8px 40px rgba(13, 76, 140, 0.14);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--text-dark);
  line-height: 1.7;
  background: var(--bg-white);
  -webkit-font-smoothing: antialiased;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-dark);
}

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

/* ====== HEADER / NAVIGATION ====== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

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

.logo img {
  height: 40px;
  width: auto;
}

.logo-text {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
  line-height: 1.2;
}

.logo-text small {
  display: block;
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--text-gray);
  letter-spacing: 0.5px;
}

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

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

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

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

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

.nav-cta {
  background: var(--primary);
  color: #fff !important;
  padding: 10px 24px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
}

.nav-cta:hover {
  background: var(--primary-light);
  color: #fff !important;
}

.nav-cta::after {
  display: none;
}

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

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-dark);
  transition: var(--transition);
}

/* ====== HERO SECTION ====== */
.hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
}

.hero-content {
  position: relative;
  z-index: 1;
  color: #fff;
  max-width: 680px;
  padding-top: 72px;
}

.hero-content h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-content h1 span {
  color: var(--accent);
}

.hero-content p {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 36px;
  line-height: 1.8;
}

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

/* ====== BUTTONS ====== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.95rem;
  font-family: var(--font-heading);
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

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

.btn-primary:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(223, 33, 39, 0.3);
}

.btn-outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
  border-color: #fff;
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

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

.btn-blue:hover {
  background: var(--primary-light);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(13, 76, 140, 0.3);
}

/* ====== SECTIONS ====== */
.section {
  padding: 100px 0;
}

.section-alt {
  background: var(--bg-light);
}

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

.section-header h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.05rem;
  color: var(--text-gray);
  max-width: 640px;
  margin: 0 auto;
}

.section-header .accent-line {
  width: 60px;
  height: 3px;
  background: var(--accent);
  margin: 20px auto 0;
  border-radius: 2px;
}

/* ====== PRODUCT GRID ====== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--primary-light);
}

.product-card .icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 20px;
}

.product-card .icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.product-card h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 10px;
}

.product-card p {
  font-size: 0.85rem;
  color: var(--text-gray);
  line-height: 1.6;
}

.product-card .card-link {
  display: inline-block;
  margin-top: 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}

.product-card .card-link:hover {
  color: var(--accent);
}

/* ====== FEATURES / ADVANTAGES ====== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  padding: 40px 32px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.feature-card .feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
}

.feature-card .feature-icon svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: #fff;
  stroke-width: 2;
}

.feature-card h3 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--text-gray);
}

/* ====== STATS BAR ====== */
.stats-bar {
  background: var(--primary);
  padding: 60px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
  color: #fff;
}

.stat-item .stat-number {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.stat-item .stat-label {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* ====== CASE STUDIES ====== */
.case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.case-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.case-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.case-card .case-img {
  height: 200px;
  overflow: hidden;
}

.case-card .case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

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

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

.case-card .case-body h3 {
  font-size: 1rem;
  margin-bottom: 8px;
}

.case-card .case-body p {
  font-size: 0.85rem;
  color: var(--text-gray);
}

/* ====== CTA SECTION ====== */
.cta-section {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 80px 0;
  text-align: center;
  color: #fff;
}

.cta-section h2 {
  color: #fff;
  font-size: 2rem;
  margin-bottom: 16px;
}

.cta-section p {
  opacity: 0.9;
  margin-bottom: 32px;
  font-size: 1.05rem;
}

/* ====== FOOTER ====== */
.site-footer {
  background: #0F172A;
  color: #CBD5E1;
  padding: 60px 0 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 20px;
}

.footer-col p {
  font-size: 0.85rem;
  line-height: 1.8;
}

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

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: #CBD5E1;
  font-size: 0.85rem;
}

.footer-col ul li a:hover {
  color: #fff;
}

.footer-logo img {
  height: 36px;
  margin-bottom: 16px;
  filter: brightness(0) invert(1);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.7;
}

/* ====== PAGE HERO (inner pages) ====== */
.page-hero {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary));
  padding: 140px 0 80px;
  color: #fff;
  text-align: center;
}

.page-hero h1 {
  color: #fff;
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 16px;
}

.page-hero p {
  opacity: 0.85;
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

.breadcrumb {
  margin-top: 20px;
  font-size: 0.85rem;
  opacity: 0.7;
}

.breadcrumb a {
  color: #fff;
}

/* ====== PRODUCT DETAIL ====== */
.product-detail {
  padding: 60px 0;
}

.product-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.product-gallery {
  position: sticky;
  top: 100px;
}

.product-gallery .main-img {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
  border: 1px solid var(--border);
}

.product-gallery .thumb-row {
  display: flex;
  gap: 12px;
}

.product-gallery .thumb-row img {
  width: 80px;
  height: 60px;
  object-fit: cover;
  border-radius: 6px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: border-color var(--transition);
}

.product-gallery .thumb-row img:hover,
.product-gallery .thumb-row img.active {
  border-color: var(--primary);
}

.product-info h1 {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.product-info .product-desc {
  color: var(--text-gray);
  margin-bottom: 32px;
  line-height: 1.8;
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.spec-table th,
.spec-table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.spec-table th {
  background: var(--bg-light);
  font-weight: 600;
  width: 40%;
}

/* ====== BLOG ====== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.blog-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
  transition: all var(--transition);
}

.blog-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

.blog-card .blog-img {
  height: 200px;
  overflow: hidden;
}

.blog-card .blog-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

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

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

.blog-card .blog-meta {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 10px;
}

.blog-card .blog-body h3 {
  font-size: 1rem;
  margin-bottom: 10px;
  line-height: 1.5;
}

.blog-card .blog-body h3 a {
  color: var(--text-dark);
}

.blog-card .blog-body h3 a:hover {
  color: var(--primary);
}

.blog-card .blog-body p {
  font-size: 0.85rem;
  color: var(--text-gray);
}

/* Blog article */
.article-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 60px 24px;
}

.article-content h1 {
  font-size: 2rem;
  margin-bottom: 16px;
}

.article-content .article-meta {
  color: var(--text-light);
  font-size: 0.85rem;
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 48px 0 20px;
}

.article-content h3 {
  font-size: 1.2rem;
  margin: 32px 0 16px;
}

.article-content p {
  margin-bottom: 20px;
  color: #374151;
}

.article-content ul,
.article-content ol {
  margin: 0 0 20px 24px;
}

.article-content li {
  margin-bottom: 8px;
  color: #374151;
}

.article-content img {
  border-radius: var(--radius);
  margin: 32px 0;
}

.article-content strong {
  color: var(--text-dark);
}

/* ====== CONTACT ====== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info-item {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.contact-info-item .ci-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--bg-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-item .ci-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 2;
}

.contact-info-item h4 {
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.contact-info-item p {
  font-size: 0.85rem;
  color: var(--text-gray);
}

.contact-form {
  background: #fff;
  padding: 40px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  font-family: var(--font-body);
  transition: border-color var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13, 76, 140, 0.1);
}

.form-group textarea {
  min-height: 120px;
  resize: vertical;
}

/* ====== ABOUT PAGE ====== */
.about-intro {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.about-intro .about-img {
  border-radius: var(--radius);
  overflow: hidden;
}

.about-intro .about-text h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
}

.about-intro .about-text p {
  color: var(--text-gray);
  margin-bottom: 16px;
}

/* ====== ANIMATIONS ====== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ====== RESPONSIVE ====== */
@media (max-width: 1024px) {
  .product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  .main-nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition);
  }
  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }
  .hero {
    min-height: 70vh;
  }
  .hero-content h1 {
    font-size: 2rem;
  }
  .product-grid {
    grid-template-columns: 1fr;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .case-grid {
    grid-template-columns: 1fr;
  }
  .blog-grid {
    grid-template-columns: 1fr;
  }
  .product-detail-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .about-intro {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 60px 0;
  }
}