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

:root {
  --primary: #0D47A1;
  --primary-light: #1976D2;
  --accent: #00BCD4;
  --accent-light: #E0F7FA;
  --text: #263238;
  --text-light: #546E7A;
  --bg: #FFFFFF;
  --bg-alt: #F5F8FC;
  --border: #E0E8F0;
  --shadow: 0 4px 20px rgba(13, 71, 161, 0.1);
  --radius: 12px;
  --max-width: 1200px;
  --font: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', -apple-system, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

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

/* Header / Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.3s;
}
.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: 70px;
}
.logo { display: flex; align-items: center; flex-shrink: 0; }
.logo img { height: 48px; width: auto; display: block; }
.logo-text { font-size: 12px; font-weight: 700; color: var(--primary); white-space: nowrap; letter-spacing: 0.5px; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 8px 18px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text);
  border-radius: 8px;
  transition: all 0.25s;
  position: relative;
}
.nav a:hover,
.nav a.active { color: var(--primary-light); background: var(--accent-light); }

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* Hero */
.hero {
  padding: 140px 0 80px;
  background: linear-gradient(135deg, #0D47A1 0%, #1565C0 40%, #1976D2 70%, #42A5F5 100%);
  color: white;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(255,255,255,0.04);
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255,255,255,0.03);
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
  font-size: 44px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: 1px;
}
.hero h1 span { color: var(--accent); }
.hero p {
  font-size: 18px;
  opacity: 0.9;
  max-width: 600px;
  margin-bottom: 32px;
  line-height: 1.8;
}
.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
}
.hero-stat { text-align: center; }
.hero-stat strong {
  display: block;
  font-size: 36px;
  color: var(--accent);
}
.hero-stat span {
  font-size: 14px;
  opacity: 0.8;
}

/* Page banner (inner pages) */
.page-banner {
  padding: 120px 0 50px;
  background: linear-gradient(135deg, #0D47A1, #1976D2);
  color: white;
  text-align: center;
}
.page-banner h1 { font-size: 36px; margin-bottom: 8px; }
.page-banner p { opacity: 0.85; font-size: 16px; }

/* Section common */
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  text-align: center;
  font-size: 30px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 12px;
}
.section-subtitle {
  text-align: center;
  color: var(--text-light);
  font-size: 16px;
  margin-bottom: 48px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Cards grid */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }

.card {
  background: white;
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}
.card:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(13,71,161,0.15); }
.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 24px;
}
.card h3 { font-size: 18px; margin-bottom: 8px; color: var(--primary); }
.card p { font-size: 14px; color: var(--text-light); line-height: 1.7; }

/* About intro */
.about-intro { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-intro-text h2 { font-size: 28px; color: var(--primary); margin-bottom: 20px; }
.about-intro-text p { color: var(--text-light); margin-bottom: 16px; line-height: 1.8; font-size: 15px; }
.about-intro-image { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }

/* Values */
.values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.value-card {
  text-align: center;
  padding: 32px 16px;
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--shadow);
}
.value-card .icon {
  font-size: 36px;
  margin-bottom: 12px;
}
.value-card h4 { font-size: 16px; color: var(--primary); margin-bottom: 6px; }
.value-card p { font-size: 13px; color: var(--text-light); }

/* Product page */
.product-showcase { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.product-gallery { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); }
.product-info h2 { font-size: 28px; color: var(--primary); margin-bottom: 16px; }
.product-info p { color: var(--text-light); margin-bottom: 16px; line-height: 1.8; }
.product-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.product-tag {
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--accent-light);
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
}

/* Suitable for list */
.suitable-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.suitable-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--bg-alt);
  border-radius: 10px;
  font-size: 14px;
}
.suitable-item .check { color: var(--primary-light); font-weight: bold; font-size: 18px; }

/* Clinical studies */
.study-card {
  background: white;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
  border-left: 4px solid var(--primary-light);
}
.study-card h4 { color: var(--primary); font-size: 16px; margin-bottom: 8px; }
.study-card p { color: var(--text-light); font-size: 14px; line-height: 1.7; }
.study-highlight {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 4px;
  background: var(--accent-light);
  color: var(--primary);
  font-weight: 600;
  font-size: 13px;
  margin: 4px 4px 0 0;
}

/* Awards */
.awards-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.award-card {
  text-align: center;
  padding: 32px 16px;
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}
.award-card:hover { transform: translateY(-4px); }
.award-card .badge {
  font-size: 40px;
  margin-bottom: 12px;
}
.award-card h4 { font-size: 15px; color: var(--primary); }

/* News */
.news-card {
  background: white;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}
.news-card:hover { transform: translateY(-4px); }
.news-card-img { height: 200px; overflow: hidden; }
.news-card-body { padding: 20px; }
.news-card-body .date { font-size: 13px; color: var(--text-light); margin-bottom: 6px; }
.news-card-body h3 { font-size: 16px; color: var(--primary); margin-bottom: 8px; }
.news-card-body p { font-size: 14px; color: var(--text-light); line-height: 1.6; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h2 { font-size: 24px; color: var(--primary); margin-bottom: 24px; }
.contact-item { display: flex; gap: 14px; margin-bottom: 20px; align-items: flex-start; }
.contact-item .icon { font-size: 22px; width: 28px; }
.contact-item strong { display: block; font-size: 15px; }
.contact-item span { font-size: 14px; color: var(--text-light); }

.contact-form { background: white; padding: 32px; border-radius: var(--radius); box-shadow: var(--shadow); }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; color: var(--text); }
.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  font-family: inherit;
  transition: border-color 0.3s;
  outline: none;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--primary-light); }
.form-group textarea { resize: vertical; min-height: 120px; }

/* Table */
table { width:100%; border-collapse:collapse; }
th, td { padding:12px 16px; text-align:left; border-bottom:1px solid var(--border); }
thead th { background:var(--primary); color:white; font-weight:600; font-size:14px; }

.btn {
  display: inline-block;
  padding: 12px 32px;
  border: none;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: all 0.3s;
}
.btn-primary { background: var(--primary-light); color: white; }
.btn-primary:hover { background: var(--primary); transform: translateY(-2px); }
.btn-outline { background: transparent; color: var(--primary-light); border: 2px solid var(--primary-light); }
.btn-outline:hover { background: var(--primary-light); color: white; }
.btn-white { background: white; color: var(--primary); }
.btn-white:hover { background: var(--accent-light); }
.btn-lg { padding: 16px 40px; font-size: 16px; }

/* Footer */
.footer {
  background: #0A2540;
  color: rgba(255,255,255,0.7);
  padding: 50px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr 1fr; gap: 32px; }
.footer-brand .logo-text { font-size: 20px; font-weight: 700; color: white; margin-bottom: 12px; }
.footer-brand p { font-size: 14px; line-height: 1.8; max-width: 300px; }
.footer-col h4 { color: white; font-size: 15px; margin-bottom: 16px; }
.footer-col-qr { text-align: center; }
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; text-align: center; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-brand p { margin: 0 auto; }
  .footer-col-qr { display: flex; flex-direction: column; align-items: center; }
}
.footer-col a {
  display: block;
  font-size: 14px;
  padding: 4px 0;
  transition: color 0.2s;
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  margin-top: 40px;
  padding-top: 20px;
  text-align: center;
  font-size: 13px;
}

/* Responsive */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s;
  }
  .nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav a { width: 100%; padding: 12px 16px; }

  .hero { padding: 120px 0 60px; text-align: center; }
  .hero h1 { font-size: 30px; }
  .hero p { font-size: 16px; margin-left: auto; margin-right: auto; }
  .hero-stats { justify-content: center; flex-wrap: wrap; gap: 24px; }

  .section { padding: 50px 0; }
  .section-title { font-size: 24px; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 20px; }
  .values-grid { grid-template-columns: 1fr 1fr; }
  .about-intro { grid-template-columns: 1fr; gap: 32px; }
  .product-showcase { grid-template-columns: 1fr; }
  .suitable-grid { grid-template-columns: 1fr; }
  .awards-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }

  .page-banner { padding: 100px 0 40px; }
  .page-banner h1 { font-size: 28px; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 24px; }
  .hero-stat strong { font-size: 28px; }
  .values-grid { grid-template-columns: 1fr 1fr; }
}

/* Animations */
.fade-in { opacity: 0; transform: translateY(20px); transition: all 0.6s ease-out; }
.fade-in.visible { opacity: 1; transform: translateY(0); }