/* ============================================
   伊莱博瑞 (elab) 官网样式
   ============================================ */

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

:root {
  /* Brand Colors */
  --brand: #0A6EBD;
  --brand-light: #3A8ED6;
  --brand-dark: #085A9A;
  --accent: #00D4AA;
  --accent-light: #33DDBB;
  --accent-dark: #00A886;

  /* Neutral Colors */
  --neutral-dark: #1A1F36;
  --neutral-light: #F7F8FC;
  --text-primary: #2D3142;
  --text-secondary: #6B7280;
  --text-light: #9CA3AF;
  --border-color: #E5E7EB;

  /* Functional */
  --white: #FFFFFF;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-hover: 0 12px 40px rgba(10, 110, 189, 0.15);

  /* Spacing */
  --nav-height: 72px;
  --section-padding: 100px 0;
  --container-max: 1200px;

  /* Typography */
  --font-cn: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-family: var(--font-cn);

  /* Transitions */
  --transition: 300ms ease-out;
}

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

body {
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.lang-en {
  font-family: var(--font-en);
}

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

/* ============================================
   Navigation
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--brand);
}

.nav-logo img {
  height: 40px;
  width: auto;
  border-radius: 6px;
}

.nav-logo-text {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--brand);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--brand);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--brand);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: var(--white);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  transition: all var(--transition);
}

.lang-switch:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.lang-switch .lang-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* Mobile menu */
.nav-mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}

.nav-mobile-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--neutral-dark) 0%, #0D1B3E 50%, #0A2A4A 100%);
}

.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(ellipse at 30% 50%, rgba(10, 110, 189, 0.15) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(0, 212, 170, 0.1) 0%, transparent 50%);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 800px;
  padding: 0 24px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  border: 1px solid rgba(0, 212, 170, 0.3);
  border-radius: 100px;
  font-size: 14px;
  color: var(--accent);
  margin-bottom: 32px;
  background: rgba(0, 212, 170, 0.08);
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.3); }
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  line-height: 1.15;
  color: var(--white);
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero h1 .text-gradient {
  background: linear-gradient(135deg, var(--accent) 0%, var(--brand-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero .subtitle {
  font-size: 20px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 48px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
}

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

.btn-primary:hover {
  background: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 110, 189, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.5);
  font-size: 13px;
  animation: float 3s ease-in-out infinite;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, rgba(255,255,255,0.3), transparent);
}

@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* ============================================
   Products Section
   ============================================ */
.products {
  padding: var(--section-padding);
  background: var(--neutral-light);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--brand);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-tag-line {
  width: 24px;
  height: 2px;
  background: var(--brand);
  border-radius: 1px;
}

.section-title {
  font-size: 42px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 680px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Product Category Tabs */
.product-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 48px;
}

.product-tab {
  padding: 10px 22px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--white);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-family);
  white-space: nowrap;
}

.product-tab:hover {
  border-color: var(--brand);
  color: var(--brand);
}

.product-tab.active {
  background: var(--brand);
  border-color: var(--brand);
  color: var(--white);
  box-shadow: 0 4px 16px rgba(10, 110, 189, 0.3);
}

/* Product Panel (category content) */
.product-panel {
  display: none;
  animation: fadePanel 0.4s ease-out;
}

.product-panel.active {
  display: block;
}

@keyframes fadePanel {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Category header inside panel */
.category-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 32px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.category-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.category-icon svg {
  width: 24px;
  height: 24px;
}

.category-icon.icon-tumor {
  background: rgba(10, 110, 189, 0.1);
  color: var(--brand);
}

.category-icon.icon-chronic {
  background: rgba(0, 212, 170, 0.1);
  color: var(--accent-dark);
}

.category-icon.icon-hospital {
  background: rgba(10, 110, 189, 0.1);
  color: var(--brand-dark);
}

.category-icon.icon-bigdata {
  background: rgba(0, 212, 170, 0.1);
  color: var(--accent);
}

.category-icon.icon-specialist {
  background: rgba(10, 110, 189, 0.1);
  color: var(--brand);
}

.category-header h3 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
}

.category-header p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Product Cards Grid */
.products-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 24px;
}

.product-card {
  background: var(--white);
  border-radius: 16px;
  padding: 32px 28px;
  transition: all var(--transition);
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.product-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(10, 110, 189, 0.1);
}

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

.product-card-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--neutral-light);
  font-size: 14px;
  font-weight: 700;
  color: var(--brand);
  margin-bottom: 16px;
}

.product-card h4 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
  line-height: 1.4;
}

.product-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
}

/* ============================================
   About Section
   ============================================ */
.about {
  padding: var(--section-padding);
  background: var(--white);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-text h2 {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.about-text .about-lead {
  font-size: 18px;
  color: var(--brand);
  font-weight: 500;
  margin-bottom: 20px;
}

.about-text p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.advantages-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.advantage-item {
  padding: 24px;
  border-radius: 12px;
  background: var(--neutral-light);
  transition: all var(--transition);
}

.advantage-item:hover {
  background: var(--white);
  box-shadow: var(--shadow-md);
}

.advantage-icon {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 20px;
  background: rgba(10, 110, 189, 0.1);
  color: var(--brand);
}

.advantage-item h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.advantage-item p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 0;
}

/* Visual side */
.about-visual {
  position: relative;
}

.about-visual-card {
  background: linear-gradient(135deg, var(--neutral-dark) 0%, #0D1B3E 100%);
  border-radius: 20px;
  padding: 48px;
  color: var(--white);
  position: relative;
  overflow: hidden;
}

.about-visual-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.15), transparent);
}

.about-visual-card::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -20%;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(10, 110, 189, 0.2), transparent);
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  position: relative;
  z-index: 1;
}

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

.stat-number {
  font-size: 40px;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
}

/* ============================================
   Contact Section
   ============================================ */
.contact {
  padding: var(--section-padding);
  background: var(--neutral-light);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.contact-info h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.contact-info > p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.7;
}

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.contact-detail-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 110, 189, 0.1);
  color: var(--brand);
  flex-shrink: 0;
}

.contact-detail-icon svg {
  width: 22px;
  height: 22px;
}

.contact-detail-text h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.contact-detail-text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

.contact-detail-text p a {
  color: var(--brand);
  text-decoration: none;
  transition: color var(--transition);
}

.contact-detail-text p a:hover {
  color: var(--brand-dark);
  text-decoration: underline;
}

.contact-form {
  background: var(--white);
  border-radius: 16px;
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

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

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  font-size: 15px;
  font-family: var(--font-family);
  color: var(--text-primary);
  background: var(--neutral-light);
  transition: all var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(10, 110, 189, 0.1);
  background: var(--white);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.btn-submit {
  width: 100%;
  padding: 14px;
  background: var(--brand);
  color: var(--white);
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-family);
}

.btn-submit:hover {
  background: var(--brand-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(10, 110, 189, 0.3);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--neutral-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 60px 0 0;
}

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

.footer-brand .nav-logo {
  margin-bottom: 16px;
}

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

.footer-brand p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
  max-width: 280px;
}

.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color var(--transition);
}

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

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social a {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: all var(--transition);
  font-size: 16px;
}

.footer-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0, 212, 170, 0.1);
}

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

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

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .about-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

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

@media (max-width: 768px) {
  :root {
    --section-padding: 60px 0;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    box-shadow: var(--shadow-md);
  }

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

  .nav-mobile-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero .subtitle {
    font-size: 17px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .section-title {
    font-size: 32px;
  }

  .product-tabs {
    gap: 6px;
  }

  .product-tab {
    padding: 8px 14px;
    font-size: 13px;
  }

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

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

  .footer-content {
    grid-template-columns: 1fr;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: 1fr 1fr;
  }
}

/* ============================================
   Language transition
   ============================================ */
.lang-fade {
  transition: opacity 200ms ease-out;
}

.lang-fade.fading {
  opacity: 0;
}