:root {
  --deep: #1a306d;
  --blue: #0066ad;
  --brand-bright: #0b8bd3;
  --gold: #bf9d6d;
  --ink: #172338;
  --muted: #58677a;
  --line: #d5e4ee;
  --soft: #f3f8fb;
  --white: #ffffff;
  color: var(--ink);
  font-family: "Segoe UI", "Microsoft YaHei", Arial, sans-serif;
  scroll-behavior: smooth;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--white); }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  min-height: 76px;
  padding: 14px clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(26, 48, 109, 0.12);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.brand img { width: min(246px, 48vw); }
.site-nav { display: flex; align-items: center; gap: clamp(14px, 2.8vw, 34px); color: var(--deep); font-size: 15px; font-weight: 700; }
.site-nav a { padding: 8px 0; border-bottom: 2px solid transparent; }
.site-nav a.active, .site-nav a:hover { color: var(--blue); border-color: var(--gold); }

.hero {
  position: relative;
  isolation: isolate;
  min-height: min(760px, calc(100vh - 76px));
  display: flex;
  align-items: center;
  padding: clamp(54px, 9vw, 118px) clamp(20px, 7vw, 100px);
  overflow: hidden;
  color: var(--white);
  background: linear-gradient(118deg, #0066ad 0%, #087fbd 56%, #0b8bd3 100%);
}

.hero::before {
  position: absolute;
  inset: 0;
  z-index: -1;
  content: "";
  background: url("./assets/biotech-dna-texture.png") center / cover no-repeat;
  opacity: 0.72;
  filter: invert(1) grayscale(1) brightness(2.4);
  mix-blend-mode: screen;
}
.hero::after {
  position: absolute;
  inset: clamp(24px, 4vw, 52px);
  z-index: -1;
  content: "";
  border: 1px solid rgba(255, 255, 255, 0.16);
  pointer-events: none;
}
.hero-copy { width: min(760px, 100%); }
.eyebrow { margin: 0 0 14px; color: var(--gold); font-size: 13px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.hero .eyebrow { color: rgba(255, 255, 255, 0.82); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 16px; color: var(--white); font-size: clamp(54px, 7vw, 92px); line-height: 1; font-weight: 800; }
.hero-lede { margin-bottom: 20px; color: var(--white); font-size: clamp(24px, 3vw, 36px); line-height: 1.3; font-weight: 700; }
.hero-summary { max-width: 700px; margin-bottom: 0; color: rgba(255, 255, 255, 0.82); font-size: 18px; line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.primary-action, .secondary-action { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 24px; border-radius: 6px; font-weight: 700; }
.primary-action { background: var(--white); color: var(--blue); box-shadow: 0 10px 28px rgba(0, 63, 112, 0.18); }
.secondary-action { border: 1px solid rgba(255, 255, 255, 0.5); color: var(--white); background: rgba(255, 255, 255, 0.08); }
.hero-company { position: absolute; right: clamp(20px, 5vw, 72px); bottom: 28px; margin: 0; color: rgba(255, 255, 255, 0.58); font-size: 13px; }

.section { padding: clamp(64px, 9vw, 112px) clamp(20px, 7vw, 100px); }
.section-heading { max-width: 860px; margin-bottom: 38px; }
h2 { margin-bottom: 16px; color: var(--deep); font-size: clamp(34px, 4.6vw, 58px); line-height: 1.12; font-weight: 750; }
h3 { margin-bottom: 12px; color: var(--deep); font-size: 23px; line-height: 1.4; }
.section-heading > p:not(.eyebrow), .statement p, .model-panel p, .business-grid p, .contact-copy p, .contact-grid p { color: var(--muted); font-size: 16px; line-height: 1.8; }
.about-section, .patent-section {
  background-color: var(--soft);
  background-image: linear-gradient(rgba(243, 248, 251, 0.94), rgba(243, 248, 251, 0.94)), url("./assets/biotech-dna-texture.png");
  background-position: center;
  background-size: cover;
}
.about-grid, .business-grid, .contact-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.statement, .business-grid article, .contact-grid article { min-height: 100%; padding: 28px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); }
.statement span, .business-grid span, .contact-grid span { display: block; margin-bottom: 12px; color: var(--gold); font-size: 13px; font-weight: 800; }

.model-panel { margin-top: 24px; padding: clamp(30px, 5vw, 50px); border-left: 5px solid var(--blue); background: var(--white); }
.model-panel h3 { font-size: clamp(26px, 3vw, 38px); }
.model-panel > p:not(.eyebrow) { max-width: 980px; }
.model-steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; margin-top: 28px; background: var(--line); }
.model-steps span { min-height: 60px; display: grid; place-items: center; padding: 12px; color: var(--deep); background: var(--soft); font-weight: 700; }
.business-grid article { border-top: 4px solid var(--blue); }

.patent-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.patent-grid figure { margin: 0; padding: 20px; border: 1px solid var(--line); border-radius: 6px; background: var(--white); }
.patent-grid img { width: 100%; height: min(64vw, 620px); object-fit: contain; background: #eef2f5; }
.patent-grid figcaption { margin-top: 14px; color: var(--deep); font-weight: 700; }

.contact-section { display: grid; grid-template-columns: minmax(280px, 0.7fr) minmax(0, 1.3fr); gap: 34px; align-items: start; }
.contact-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.contact-grid strong, .contact-grid a { display: block; }
.contact-grid strong { margin: 10px 0 6px; color: var(--ink); }
.contact-grid a { margin: 5px 0; color: var(--blue); overflow-wrap: anywhere; }

.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 28px clamp(20px, 7vw, 100px); background: var(--deep); color: rgba(255, 255, 255, 0.82); }
.site-footer img { width: 48px; }
.site-footer p { margin: 0; font-size: 14px; }

@media (max-width: 980px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: 12px; }
  .site-nav { width: 100%; overflow-x: auto; padding-bottom: 3px; }
  .hero { min-height: 680px; }
  .contact-section { grid-template-columns: 1fr; }
  .about-grid, .business-grid, .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .site-header { padding: 13px 18px; }
  .site-nav { gap: 18px; font-size: 14px; }
  .hero { min-height: 610px; padding: 24px 18px; background-position: 58% center; }
  .hero::after { inset: 12px; }
  .hero-actions a { width: 100%; }
  .hero-company { display: none; }
  .section { padding-right: 18px; padding-left: 18px; }
  .model-steps { grid-template-columns: 1fr; }
  .patent-grid { grid-template-columns: 1fr; }
  .patent-grid img { height: min(126vw, 620px); }
  .statement, .business-grid article, .contact-grid article { padding: 22px; }
  .site-footer { align-items: flex-start; flex-direction: column; }
}