/* Mancheng Machinery - Global styles */
:root {
  --primary: #0d3b66;
  --primary-light: #1a5a8c;
  --accent: #e85d04;
  --accent-hover: #d45103;
  --dark: #1a1a2e;
  --gray: #6c757d;
  --light: #f8f9fa;
  --white: #fff;
  --shadow: 0 4px 20px rgba(0,0,0,0.1);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* Header & Nav */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.98);
  box-shadow: var(--shadow);
  transition: background var(--transition);
}

.site-header.scrolled {
  background: var(--white);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 0;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary);
}

.logo span {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.nav-menu a {
  padding: 0.5rem 1rem;
  font-weight: 500;
  border-radius: 6px;
}

.nav-menu a:hover {
  color: var(--accent);
}

/* Header social icons */
.header-social {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-left: 0.25rem;
}

.header-social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  color: var(--primary);
  transition: background var(--transition), color var(--transition);
}

.header-social-icon:hover {
  background: var(--primary);
  color: var(--white);
}

.header-social-icon svg {
  flex-shrink: 0;
}

.lang-switcher {
  display: flex;
  gap: 4px;
  margin-left: 0.5rem;
}

.lang-switcher a {
  padding: 0.35rem 0.6rem;
  font-size: 0.85rem;
  border: 1px solid var(--gray);
  border-radius: 4px;
  background: var(--white);
}

.lang-switcher a:hover,
.lang-switcher a.active {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* Main content - page padding for fixed header */
main {
  padding-top: 70px;
  min-height: calc(100vh - 200px);
}

/* Hero & Carousel */
.hero {
  position: relative;
  height: 360px;
  overflow: hidden;
}

.carousel {
  position: relative;
  height: 100%;
  width: 100%;
}

.carousel-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.6s ease;
  background-size: cover;
  background-position: center;
}

.carousel-slide.active {
  opacity: 1;
  z-index: 1;
}

.carousel-slide:nth-child(1) {
  background-image: linear-gradient(135deg, rgba(13,59,102,0.85) 0%, rgba(26,26,46,0.8) 100%), url('../images/轮播图/2.jfif');
  background-size: cover;
  background-position: center;
}
.carousel-slide:nth-child(2) {
  background-image: linear-gradient(135deg, rgba(13,59,102,0.85) 0%, rgba(26,26,46,0.8) 100%), url('../images/轮播图/5.jfif');
  background-size: cover;
  background-position: center;
}
.carousel-slide:nth-child(3) {
  background-image: linear-gradient(135deg, rgba(13,59,102,0.85) 0%, rgba(26,26,46,0.8) 100%), url('../images/轮播图/Bystronic%20225-ton%20bending%20equipment.jpg');
  background-size: cover;
  background-position: center;
}

.slide-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 3rem 20px 2rem;
  color: var(--white);
  background: linear-gradient(transparent, rgba(0,0,0,0.6));
}

.slide-content h2 {
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  margin-bottom: 0.5rem;
}

.slide-content p {
  font-size: 1rem;
  opacity: 0.95;
  max-width: 600px;
}

.carousel-dots {
  position: absolute;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.carousel-dots button {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--white);
  background: transparent;
  cursor: pointer;
  transition: background var(--transition);
}

.carousel-dots button.active,
.carousel-dots button:hover {
  background: var(--white);
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border: none;
  background: rgba(255,255,255,0.2);
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
  z-index: 2;
  transition: background var(--transition);
  border-radius: 50%;
}

.carousel-arrow:hover {
  background: rgba(255,255,255,0.4);
}

.carousel-arrow.prev { left: 1rem; }
.carousel-arrow.next { right: 1rem; }

/* Sections */
.section {
  padding: 4rem 0;
}

.section-title {
  text-align: center;
  margin-bottom: 2rem;
}

.section-title h2 {
  font-size: 2rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.section-title p {
  color: var(--gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background var(--transition), transform 0.2s;
}

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

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

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

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

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.card-image {
  width: 100%;
  height: 200px;
  min-height: 200px;
  background: var(--light);
  background-size: cover;
  background-position: center;
  display: block;
  flex-shrink: 0;
}

.card-body {
  padding: 1.5rem;
}

.card-body h3 {
  font-size: 1.25rem;
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.card-body p {
  color: var(--gray);
  font-size: 0.95rem;
}

/* Certificates */
.certificates-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 1rem;
  align-items: start;
}

.certificate-item {
  text-align: center;
}

.certificate-link {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.certificate-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}

.certificate-link img {
  width: 100%;
  height: auto;
  aspect-ratio: 3/4;
  object-fit: cover;
}

.certificate-label {
  margin-top: 0.75rem;
  font-weight: 600;
  color: var(--primary);
  font-size: 1rem;
}

@media (max-width: 768px) {
  .certificates-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* Lead capture popup */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.popup-overlay.open {
  opacity: 1;
  visibility: visible;
}

.popup-box {
  background: var(--white);
  border-radius: 12px;
  max-width: 480px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  transform: scale(0.9);
  transition: transform 0.3s;
}

.popup-overlay.open .popup-box {
  transform: scale(1);
}

.popup-header {
  padding: 1.5rem 1.5rem 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.popup-header h3 {
  font-size: 1.5rem;
  color: var(--primary);
}

.popup-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray);
  line-height: 1;
}

.popup-close:hover {
  color: var(--dark);
}

.popup-body {
  padding: 1rem 1.5rem 1.5rem;
}

.popup-body p {
  color: var(--gray);
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid #dee2e6;
  border-radius: 6px;
  font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(13,59,102,0.15);
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
}

.popup-body .btn {
  width: 100%;
  padding: 0.85rem;
  margin-top: 0.5rem;
}

/* Page titles */
.page-hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--white);
  padding: 3rem 0;
  text-align: center;
}

.page-hero h1 {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.page-hero p {
  opacity: 0.9;
  font-size: 1.05rem;
}

/* Footer */
.site-footer {
  background: var(--dark);
  color: var(--white);
  padding: 3rem 0 1.5rem;
  margin-top: 4rem;
}

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

.footer-brand .logo {
  color: var(--white);
}

.footer-brand .logo span {
  color: var(--accent);
}

.footer-brand p {
  margin-top: 0.5rem;
  opacity: 0.8;
  font-size: 0.95rem;
}

.footer-links h4 {
  font-size: 1rem;
  margin-bottom: 1rem;
  opacity: 0.9;
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
}

.footer-links li {
  margin-bottom: 0;
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: rgba(255,255,255,0.9);
  transition: color var(--transition), background var(--transition), transform 0.2s;
}

.footer-social-icon:hover {
  color: var(--white);
  background: var(--accent);
  transform: translateY(-2px);
}

.footer-social-icon svg {
  flex-shrink: 0;
}

.footer-bottom {
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.9rem;
  opacity: 0.8;
}

/* Social links on Contact page */
.social-links-contact {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-top: 2.5rem;
  padding-top: 2.5rem;
  border-top: 1px solid #dee2e6;
  text-align: center;
}

.social-links-contact .social-label {
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.social-links-contact .social-icons-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2.5rem;
  flex-wrap: wrap;
}

.social-links-contact .social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--light);
  color: var(--primary);
  transition: background var(--transition), color var(--transition), transform 0.2s;
}

.social-links-contact .social-icon:hover {
  background: var(--primary);
  color: var(--white);
  transform: translateY(-2px);
}

.social-links-contact .social-icon svg {
  flex-shrink: 0;
}

/* Contact form (page) */
.contact-form-wrap {
  max-width: 600px;
  margin: 0 auto;
}

.contact-info {
  text-align: left;
  max-width: 600px;
  margin: 3rem auto 0;
  padding-left: 0;
}

.contact-info p {
  margin-bottom: 0.75rem;
  color: var(--dark);
  line-height: 1.6;
}

.contact-form-wrap .form-group {
  margin-bottom: 1.25rem;
}

.contact-form-wrap .btn {
  margin-top: 0.5rem;
}

/* Utility */
.text-center { text-align: center; }
.mt-2 { margin-top: 1rem; }
.mb-2 { margin-bottom: 1rem; }

/* Mobile */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 1rem;
    box-shadow: var(--shadow);
    transform: translateY(-120%);
    transition: transform 0.3s;
    gap: 0;
  }

  .nav-menu.open {
    transform: translateY(0);
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;
    padding: 0.75rem 1rem;
  }

  .header-social {
    margin-left: 0;
    margin-top: 0.5rem;
    justify-content: center;
  }

  .lang-switcher {
    margin-left: 0;
    margin-top: 0.5rem;
  }

  .hero {
    height: 280px;
  }

  .slide-content h2 {
    font-size: 1.35rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

/* RTL / language-specific (e.g. future Arabic) - not required for EN/ES/RU */
[dir="rtl"] .carousel-arrow.prev { left: auto; right: 1rem; }
[dir="rtl"] .carousel-arrow.next { right: auto; left: 1rem; }