/* ===================================
   芯启信息 IoT 官网 - 组件样式
   Component Styles
   =================================== */

/* ---- Navigation (导航栏) ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--color-gray-200);
  z-index: var(--z-fixed);
  transition: all var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.navbar-logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
  border-radius: var(--radius-lg);
}

.navbar-brand-text {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-gray-900);
}

.navbar-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.navbar-link {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-gray-700);
  text-decoration: none;
  position: relative;
  padding: var(--space-2) 0;
  transition: color var(--transition-fast);
}

.navbar-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition-base);
}

.navbar-link:hover {
  color: var(--color-primary);
}

.navbar-link:hover::after {
  width: 100%;
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.lang-switcher {
  display: flex;
  background: var(--color-gray-100);
  border-radius: var(--radius-md);
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  padding: 6px 12px;
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  color: var(--color-gray-600);
}

.lang-btn.active {
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

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

.mobile-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-gray-800);
  border-radius: 2px;
  transition: all var(--transition-base);
}

@media (max-width: 768px) {
  /* Mobile menu: hidden by default, fullscreen overlay when open */
  .navbar-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    bottom: 0;
    background: #ffffff;
    flex-direction: column;
    padding: 0;
    gap: 0;
    z-index: 9998;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  }

  .navbar-menu.open {
    display: flex !important;
  }

  /* Expand navbar to full height when menu is open (parent height was clipping the menu) */
  .navbar.menu-open {
    height: 100vh;
    height: 100dvh;
  }

  .mobile-toggle {
    display: flex;
    z-index: 10000;
    position: relative;
  }

  /* Mobile nav links - full width, clear separation */
  .navbar-link {
    font-size: 16px;
    padding: 14px 20px;
    border-bottom: 1px solid #f1f3f5;
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: #1a202c;
    font-weight: 500;
    min-height: 52px;
  }

  .navbar-link:hover,
  .navbar-link.active {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.04);
  }

  /* First link (home) without bottom border on the dropdown container */
  .navbar-menu > .navbar-link:first-child {
    border-top: 1px solid #f1f3f5;
  }

  .navbar-dropdown > .navbar-link,
  .navbar-dropdown > .dropdown-trigger {
    width: 100%;
    border-bottom: 1px solid #f1f3f5;
  }

  /* Mobile dropdown accordion */
  .navbar-dropdown {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    position: relative;
  }

  .dropdown-arrow {
    transition: transform 0.2s ease;
    opacity: 0.6;
    flex-shrink: 0;
    margin-left: 8px;
  }

  .navbar-dropdown.open > .dropdown-arrow {
    transform: rotate(180deg);
    opacity: 1;
  }

  .dropdown-trigger {
    cursor: pointer;
  }

  /* Sub-menu items: hidden by default, shown when parent has .open */
  .dropdown-menu {
    display: none;
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: none;
    background: #f8fafc;
    padding: 0;
    min-width: auto;
    border-radius: 0;
  }

  .navbar-dropdown.open > .dropdown-menu {
    display: block;
  }

  .dropdown-item {
    font-size: 15px;
    padding: 12px 20px 12px 32px;
    color: #4a5568;
    border-bottom: 1px solid #edf2f7;
    display: block;
    text-decoration: none;
    transition: all 0.15s ease;
  }

  .dropdown-item:last-child {
    border-bottom: none;
  }

  .dropdown-item:hover,
  .dropdown-item.active {
    background: rgba(37, 99, 235, 0.08);
    color: #2563eb;
  }

  /* Lang switcher size adjustment */
  .lang-switcher {
    font-size: var(--text-sm);
  }
}


/* ---- Navbar Dropdown (导航下拉菜单) ---- */
.navbar-dropdown {
  position: relative;
  display: flex;
  align-items: center;
  gap: 2px;
}

.dropdown-arrow {
  flex-shrink: 0;
  color: var(--color-gray-400);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.navbar-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
  color: var(--color-primary);
}

.dropdown-trigger {
  cursor: pointer;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 180px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-3) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: calc(var(--z-fixed) + 10);
  border: 1px solid var(--color-gray-100);
}

.navbar-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(4px);
}

.dropdown-item {
  display: block;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
  text-decoration: none;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.dropdown-item:hover {
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding-left: var(--space-6);
}


/* ---- Hero Section (首屏区域) ---- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, #F8FAFF 0%, #E6F2FF 50%, #F0F7FF 100%);
}

/* Three.js Particle Canvas */
#particle-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 5;
  max-width: 720px;
  width: 100%;
}

.hero-bg-pattern {
  position: absolute;
  inset: 0;
  opacity: 0.4;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(0, 128, 255, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 80% 30%, rgba(0, 128, 255, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 60% 80%, rgba(0, 128, 255, 0.05) 0%, transparent 45%);
}

.hero-grid-lines {
  position: absolute;
  inset: 0;
  opacity: 0.06;
  background-image:
    linear-gradient(var(--color-primary) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-primary) 1px, transparent 1px);
  background-size: 80px 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-white);
  border: 1px solid var(--color-primary-200);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-primary);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease forwards;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: var(--font-bold);
  line-height: 1.15;
  color: var(--color-gray-900);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease 100ms forwards;
  opacity: 0;
}

.hero-title .highlight {
  background: linear-gradient(135deg, var(--color-primary), #0055CC);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  max-width: 560px;
  margin-bottom: var(--space-10);
  animation: fadeInUp 0.6s ease 200ms forwards;
  opacity: 0;
}

.hero-buttons {
  display: flex;
  gap: var(--space-4);
  animation: fadeInUp 0.6s ease 300ms forwards;
  opacity: 0;
  position: relative;
  z-index: 10;
}

.hero-buttons .btn {
  position: relative;
  z-index: 1;
}

.hero-visual {
  position: absolute;
  right: 5%;
  top: 50%;
  transform: translateY(-50%);
  width: 420px;
  height: 420px;
  opacity: 0.9;
  animation: fadeIn 1s ease 400ms forwards;
}

@media (max-width: 1024px) {
  .hero-visual {
    display: none;
  }
  
  .hero-content {
    max-width: 100%;
    text-align: center;
  }
  
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-buttons {
    justify-content: center;
  }

  /* Full-width safety for all screen sizes below 1024px */
  .hero {
    width: 100%;
    max-width: 100vw;
  }

  #particle-canvas,
  .hero-bg-pattern,
  .hero-grid-lines {
    width: 100%;
    max-width: 100vw;
  }
}

/* ---- Solutions Section (解决方案) ---- */
.solutions-section {
  background: var(--color-white);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.solution-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  transition: all var(--transition-slow);
  position: relative;
  overflow: hidden;
}

.solution-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-200));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.solution-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-200);
}

.solution-card:hover::before {
  transform: scaleX(1);
}

.solution-icon {
  width: 64px;
  height: 64px;
  background: var(--color-primary-50);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
  font-size: 28px;
  color: var(--color-primary);
  transition: all var(--transition-base);
}

.solution-card:hover .solution-icon {
  background: var(--color-primary);
  color: var(--color-white);
  transform: scale(1.05);
}

.solution-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.solution-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

.solution-desc {
  font-size: var(--text-base);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
}

.solution-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}

.feature-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-gray-700);
}

.feature-item svg {
  width: 18px;
  height: 18px;
  color: var(--color-success);
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .solutions-grid {
    grid-template-columns: 1fr;
  }
  
  .solution-features {
    grid-template-columns: 1fr;
  }
}

/* ---- Products Section (产品服务) ---- */
.products-section {
  background: var(--color-gray-50);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  text-align: center;
  transition: all var(--transition-base);
  cursor: pointer;
}

.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-200);
}

.product-icon-wrapper {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--space-5);
  background: linear-gradient(135deg, var(--color-primary-50), var(--color-primary-100));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.product-card:hover .product-icon-wrapper {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  transform: scale(1.08);
}

.product-icon-wrapper svg {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  transition: color var(--transition-base);
}

.product-card:hover .product-icon-wrapper svg {
  color: var(--color-white);
}

.product-name {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-3);
}

.product-desc {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  line-height: var(--leading-relaxed);
}

@media (max-width: 1024px) {
  .products-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .products-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Stats Section (数据统计) ---- */
.stats-section {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: var(--color-white);
  padding: var(--space-16) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  text-align: center;
}

.stat-item {
  padding: var(--space-6);
}

.stat-number {
  font-size: var(--text-5xl);
  font-weight: var(--font-bold);
  line-height: 1;
  margin-bottom: var(--space-3);
}

.stat-label {
  font-size: var(--text-base);
  opacity: 0.85;
  font-weight: var(--font-normal);
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .stat-number {
    font-size: var(--text-4xl);
  }
}

/* ---- Cases Section (案例展示) ---- */
.cases-section {
  background: var(--color-white);
}

.case-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-10);
  align-items: center;
  padding: var(--space-10);
  background: var(--color-gray-50);
  border-radius: var(--radius-2xl);
  margin-bottom: var(--space-8);
  transition: all var(--transition-base);
}

.case-card:nth-child(even) {
  direction: rtl;
}

.case-card:nth-child(even) > * {
  direction: ltr;
}

.case-card:hover {
  box-shadow: var(--shadow-lg);
}

.case-category {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-50);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
}

.case-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
  line-height: var(--leading-snug);
}

.case-desc {
  font-size: var(--text-base);
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
}

.case-visual {
  aspect-ratio: 16/10;
  background: linear-gradient(135deg, var(--color-primary-100), var(--color-primary-200));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.case-visual-placeholder {
  font-size: var(--text-4xl);
  color: var(--color-primary);
  opacity: 0.3;
}

@media (max-width: 768px) {
  .case-card,
  .case-card:nth-child(even) {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  
  .case-visual {
    order: -1;
  }
}

/* ---- About Section (关于我们) ---- */
.about-section {
  background: var(--color-gray-50);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.about-text h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-gray-800);
  margin-bottom: var(--space-3);
}

.about-text p {
  color: var(--color-gray-600);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-8);
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.value-item {
  padding: var(--space-5);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  text-align: center;
  font-weight: var(--font-semibold);
  color: var(--color-primary-dark);
  transition: all var(--transition-base);
}

.value-item:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

@media (max-width: 768px) {
  .about-content {
    grid-template-columns: 1fr;
  }
}

/* ---- Contact Section (联系我们) ---- */
.contact-section {
  background: var(--color-white);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
}

.contact-info-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  margin-top: var(--space-8);
}

.contact-info-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}

.contact-info-icon {
  width: 48px;
  height: 48px;
  background: var(--color-primary-50);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-info-icon svg {
  width: 22px;
  height: 22px;
  color: var(--color-primary);
}

.contact-info-label {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-gray-800);
  margin-bottom: var(--space-1);
}

.contact-info-value {
  font-size: var(--text-base);
  color: var(--color-gray-600);
}

.contact-form {
  background: var(--color-gray-50);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-2xl);
  padding: var(--space-8);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-group.full-width {
  grid-column: span 2;
}

.form-label {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-gray-700);
}

.form-input,
.form-textarea {
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-gray-800);
  background: var(--color-white);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 128, 255, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-gray-400);
}

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

/* ---- Manager Cards (经理卡片) ---- */
.manager-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.manager-card {
  background: var(--color-card-background);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  text-align: center;
}

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

.manager-qr {
  width: 150px;
  height: auto;
  max-height: 220px;
  margin: 0 auto var(--space-4);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
}

.manager-qr .qr-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

.manager-info {
  text-align: center;
}

.manager-info h3 {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  margin-bottom: var(--space-2);
  color: var(--color-text-primary);
}

.manager-role {
  display: inline-block;
  padding: 6px 18px;
  background: linear-gradient(135deg, #1a56db 0%, #2563eb 100%);
  color: #ffffff;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  letter-spacing: 0.5px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.manager-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-relaxed);
}

.manager-phone {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-50);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
}

.manager-phone i {
  font-size: var(--text-sm);
}

@media (max-width: 1024px) {
  .manager-grid {
    grid-template-columns: 1fr 1fr;
  }
  .douyin-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .manager-grid {
    grid-template-columns: 1fr;
  }
}

/* ---- Douyin Cards (抖音卡片) ---- */
.douyin-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.douyin-card {
  background: var(--color-card-background);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

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

.douyin-qr {
  flex-shrink: 0;
  width: 140px;
  height: auto;
  max-height: 200px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
}

.douyin-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: contain;
}

.douyin-info {
  flex: 1;
  min-width: 0;
}

.douyin-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.douyin-logo i {
  color: #000;
  font-size: 1.3em;
}

.douyin-id {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
  font-family: 'SF Mono', 'Monaco', 'Menlo', monospace;
}

.douyin-desc {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3);
  line-height: var(--leading-relaxed);
}

.douyin-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: linear-gradient(135deg, #000, #333);
  color: #fff;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  text-decoration: none;
  transition: all 0.3s ease;
}

.douyin-link:hover {
  background: linear-gradient(135deg, #fe2c55, #ff0050);
  transform: translateY(-1px);
}

@media (max-width: 768px) {
  .douyin-card {
    flex-direction: column;
    text-align: center;
    padding: var(--space-4);
  }
  .douyin-qr {
    width: 130px;
    margin: 0 auto;
  }
  .douyin-logo {
    justify-content: center;
  }
  .douyin-link {
    margin: 0 auto;
  }
}

/* ---- Application Scenarios (应用场景) ---- */
.scenarios-section {
  background: #F6F9FC;
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  align-items: stretch;
}

.scenario-card {
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  padding: var(--space-6);
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.35s ease,
              border-color 0.35s ease;
}

.scenario-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-dark));
  opacity: 0;
  transition: opacity 0.35s ease;
}

.scenario-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-200);
}

.scenario-card:hover::before {
  opacity: 1;
}

/* 卡片头部：图标 + （分类标签 / 标题） */
.scenario-card-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.scenario-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
}

.scenario-icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.scenario-heading {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  min-width: 0;
}

.scenario-category {
  display: inline-block;
  margin-bottom: 6px;
  padding: 2px 10px;
  background: var(--color-primary-50);
  border: 1px solid rgba(0, 128, 255, 0.15);
  border-radius: 999px;
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  line-height: 1.6;
  letter-spacing: 0.3px;
}

.scenario-title {
  margin: 0;
  color: var(--color-gray-900);
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  line-height: 1.35;
}

/* 背景描述：占满剩余高度，使下方「成效」条底部对齐 */
.scenario-bg {
  flex: 1;
  margin: 0 0 var(--space-5);
  color: var(--color-gray-600);
  font-size: var(--text-sm);
  line-height: 1.75;
}

/* 成效：左侧色条 + 淡蓝底 */
.scenario-result {
  position: relative;
  overflow: hidden;
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(135deg, rgba(0, 128, 255, 0.06), rgba(0, 128, 255, 0.02));
  border: 1px solid rgba(0, 128, 255, 0.10);
  border-radius: var(--radius-lg);
}

.scenario-result::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--color-primary), var(--color-primary-dark));
  border-radius: 0 3px 3px 0;
}

.scenario-result-label {
  display: block;
  margin-bottom: 4px;
  color: var(--color-primary);
  font-size: 11px;
  font-weight: var(--font-bold);
  line-height: 1.4;
  letter-spacing: 0.08em;
}

.scenario-result-text {
  display: block;
  color: var(--color-gray-800);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  line-height: 1.7;
}

/* ==================== TECH BACKBONE SECTION ==================== */
.tech-backbone-section {
  background: linear-gradient(180deg, var(--color-background) 0%, var(--color-gray-50) 100%);
}

.tech-backbone-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  max-width: 1100px;
  margin: 0 auto;
}

.tech-card {
  background: var(--color-surface);
  border-radius: var(--radius-2xl);
  padding: var(--space-8) var(--space-6);
  box-shadow: var(--shadow-md);
  transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.tech-card::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 70%);
  pointer-events: none;
  transition: transform 0.6s ease;
}

.tech-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-200);
}

.tech-card:hover::after {
  transform: scale(1.5);
}

.tech-card-badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  padding: 4px 12px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-600));
  color: #fff;
  font-size: var(--text-2xs);
  font-weight: var(--font-bold);
  letter-spacing: 1.5px;
  border-radius: 20px;
}

.tech-card-icon {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-primary-50), var(--color-primary-100));
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  color: var(--color-primary-600);
  transition: all 0.4s ease;
}

.tech-card:hover .tech-card-icon {
  background: linear-gradient(135deg, var(--color-primary-100), var(--color-primary-200));
  transform: scale(1.08);
}

.tech-card-icon svg {
  width: 36px;
  height: 36px;
}

.tech-card-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--space-3);
}

.tech-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-6);
  max-width: 400px;
}

.tech-feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.tech-feature-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  text-align: left;
}

.tech-feature-item:hover {
  background: var(--color-primary-50);
}

.tech-feature-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-primary);
}

.tech-feature-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.tech-feature-text strong {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

.tech-feature-text span {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

@media (max-width: 768px) {
  .tech-backbone-grid {
    grid-template-columns: 1fr;
  }

  .tech-card {
    padding: var(--space-6) var(--space-4);
  }

  .tech-card-icon {
    width: 56px;
    height: 56px;
    margin-bottom: var(--space-3);
  }

  .tech-card-icon svg {
    width: 28px;
    height: 28px;
  }

  .tech-card-title {
    font-size: var(--text-xl);
  }

  .tech-card-desc {
    font-size: var(--text-xs);
  }
}

@media (max-width: 1024px) {
  .scenarios-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .scenarios-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .form-grid {
    grid-template-columns: 1fr;
  }
  
  .form-group.full-width {
    grid-column: span 1;
  }
}

/* ---- Footer (页脚) ---- */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-12);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.footer-brand img {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-lg);
}

.footer-brand-text {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-white);
}

.footer-desc {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: var(--color-gray-400);
  max-width: 320px;
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-5);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-link {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--space-8);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

.footer-legal {
  display: flex;
  gap: var(--space-6);
}

.footer-legal a {
  color: var(--color-gray-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-legal a:hover {
  color: var(--color-white);
}

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-4);
    text-align: center;
  }
}

/* ===================================
   3D Product Showcase (3D产品展示区)
   =================================== */
.product-showcase-section {
  position: relative;
  padding: var(--space-20) 0;
  overflow: hidden;
  background: linear-gradient(135deg, #f0f5fb 0%, #e8eff8 30%, #f5f8fd 60%, #eef3fc 100%);
}

.product-showcase-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(0,128,255,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(0,200,255,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(100,100,255,0.03) 0%, transparent 50%);
  pointer-events: none;
}

.showcase-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

/* Viewer Column */
.showcase-viewer-col {
  position: relative;
}

.showcase-viewer-wrapper {
  position: relative;
  width: 100%;
  /* 4:3 横构图：实物是 4:1 的扁平电路板，方形画布上下留白过多（占卡高 ~78%）。
     横构图后卡片矮 25%，产品占比反而更高。素材画布 images/views/*.png 同为 4:3，
     两者一致才能让 object-fit: contain 铺满，否则方形素材会被按高缩放、产品缩小 */
  aspect-ratio: 4 / 3;
  max-width: 600px;
  margin: 0 auto;
  border-radius: 24px;
  overflow: hidden;
  /* 浅色展台：实物是俯拍电路板（绿色阻焊 + 黑色器件），浅底比深底更能分辨层次 */
  background:
    radial-gradient(ellipse at 50% 58%, rgba(0,128,255,0.07) 0%, transparent 62%),
    linear-gradient(160deg, #ffffff 0%, #f1f6fd 100%);
  border: 1px solid rgba(13,21,40,0.08);
  box-shadow:
    0 0 60px rgba(0,128,255,0.10),
    0 18px 50px rgba(13,21,40,0.10);
  transition: box-shadow 0.4s ease;
}

.showcase-viewer-wrapper:hover {
  box-shadow:
    0 0 80px rgba(0,128,255,0.16),
    0 24px 64px rgba(13,21,40,0.14);
}

.showcase-canvas {
  width: 100%;
  height: 100%;
  cursor: grab;
  position: relative;
}

.showcase-canvas:active {
  cursor: grabbing;
}

.showcase-canvas canvas {
  display: block;
}

.showcase-canvas .photo-360-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  -webkit-user-select: none;
  user-select: none;
  pointer-events: auto;
}

/* 四向/八向定点查看器 */
.showcase-canvas .snap-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  -webkit-user-select: none;
  user-select: none;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

.showcase-canvas .snap-layer.visible {
  opacity: 1;
}

.showcase-canvas .snap-dots {
  position: absolute;
  left: 50%;
  bottom: 10px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 5;
}

.showcase-canvas .snap-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: none;
  border-radius: 50%;
  /* 浅色卡片上白点不可见，改用深色半透明 */
  background: rgba(13,21,40,0.22);
  cursor: pointer;
  transition: background 0.2s ease;
}

.showcase-canvas .snap-dot.active {
  background: #0080FF;
}

/* Control Hints */
.showcase-control-hints {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-5);
  padding: var(--space-3) var(--space-6);
  background: rgba(0,0,0,0.04);
  border-radius: 50px;
  border: 1px solid rgba(0,0,0,0.06);
  width: fit-content;
  margin-left: auto;
  margin-right: auto;
}

.hint-item {
  font-size: 0.8rem;
  color: var(--color-gray-500);
  letter-spacing: 0.3px;
  transition: color 0.3s ease;
}

.hint-separator {
  color: var(--color-gray-300);
  font-size: 0.7rem;
}

.showcase-viewer-wrapper:hover ~ .showcase-control-hints .hint-item,
.showcase-control-hints:hover .hint-item {
  color: var(--color-gray-700);
}

/* Info Column */
.showcase-info-col {
  color: var(--color-gray-800);
}

.showcase-info-col .section-label {
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  display: inline-block;
}

.showcase-title {
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--space-4);
  background: linear-gradient(135deg, #1a3a5c 0%, #0080FF 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.showcase-desc {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-gray-500);
  margin-bottom: var(--space-8);
}

/* Highlights */
.showcase-highlights {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-bottom: var(--space-8);
}

.highlight-item {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  padding: var(--space-4);
  border-radius: 14px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--color-gray-200);
  transition: all 0.3s ease;
}

.highlight-item:hover {
  background: rgba(0,128,255,0.06);
  border-color: rgba(0,128,255,0.25);
  transform: translateX(4px);
}

.highlight-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0,128,255,0.1), rgba(0,200,255,0.08));
  color: var(--color-primary);
  flex-shrink: 0;
}

.highlight-item h4 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gray-800);
  margin-bottom: 2px;
}

.highlight-item p {
  font-size: 0.85rem;
  color: var(--color-gray-500);
  line-height: 1.5;
}

/* Actions */
.showcase-actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.showcase-actions .btn {
  border-radius: 12px;
  padding: 14px 28px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: none;
}

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

.showcase-actions .btn-primary:hover {
  background: #0066cc;
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,128,255,0.35);
}

.showcase-reset-btn {
  background: #fff !important;
  border: 1px solid var(--color-gray-300) !important;
  color: var(--color-gray-600) !important;
}

.showcase-reset-btn:hover {
  background: var(--color-gray-50) !important;
  border-color: var(--color-primary) !important;
  color: var(--color-primary) !important;
  transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 1024px) {
  .showcase-grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .showcase-viewer-wrapper {
    max-width: 460px;
    aspect-ratio: 4 / 3;
  }

  .showcase-info-col {
    text-align: center;
  }

  .showcase-highlights .highlight-item {
    text-align: left;
  }

  .showcase-actions {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .product-showcase-section {
    padding: var(--space-12) 0;
  }

  .showcase-viewer-wrapper {
    max-width: 340px;
    aspect-ratio: 4 / 3;
  }

  .showcase-control-hints {
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: 0.75rem;
    flex-wrap: wrap;
  }

  .hint-separator {
    display: none;
  }

  .showcase-actions {
    flex-direction: column;
    align-items: center;
  }
}