/* ============================================================
   Yanmei Bio-Technology (YANMEI COS) - Haute Aesthetic Design System
   Clinical Luxury & Precision Engineering Theme
   Compatible with all mobile, desktop & high-retina displays
   ============================================================ */
:root {
  --plum-dark: #140B13;
  --plum-deep: #22101E;
  --plum-rich: #3A1B32;
  --plum-soft: #5C2B4E;
  --berry-vibrant: #8A2B52;
  --berry-light: #B44A72;
  
  --champ-gold: #C5A059;
  --champ-bright: #E5C37E;
  --champ-pale: #F3E5C8;
  --champ-border: rgba(197, 160, 89, 0.35);
  
  --bg-cleanroom: #FAF8F5;
  --bg-pure: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-tint: #F6F2EA;
  
  --text-dark: #191417;
  --text-body: #383035;
  --text-muted: #73676F;
  --text-light: #ECE4E9;
  
  --border-line: #E8E0D2;
  --border-line-dark: #382534;
  
  --font-serif: 'Playfair Display', Didot, 'Bodoni 72', Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Monaco, Consolas, monospace;
  
  --shadow-sm: 0 2px 8px rgba(34, 16, 30, 0.05);
  --shadow-md: 0 8px 24px rgba(34, 16, 30, 0.08);
  --shadow-lg: 0 16px 40px rgba(34, 16, 30, 0.12);
  --shadow-gold: 0 8px 30px rgba(197, 160, 89, 0.22);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background-color: var(--bg-cleanroom);
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Typography Hierarchy */
h1, h2, h3, h4, .font-serif {
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--plum-dark);
}

a { color: inherit; text-decoration: none; transition: color 0.15s, border-color 0.15s; }

.wrap {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header & Top Navigation */
.header-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 248, 245, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-line);
}
.header-nav .nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-name {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 5px;
  color: var(--plum-dark);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--champ-gold);
  text-transform: uppercase;
  border-left: 1px solid var(--champ-border);
  padding-left: 10px;
  margin-left: 4px;
}
.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 14.5px;
  font-weight: 600;
}
.nav-link {
  color: var(--text-body);
}
.nav-link:hover {
  color: var(--berry-vibrant);
}
.nav-cta-btn {
  background: var(--plum-deep);
  color: #FFFFFF !important;
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 8px;
  border: 1px solid var(--champ-border);
  transition: all 0.2s ease;
}
.nav-cta-btn:hover {
  background: var(--plum-rich);
  box-shadow: var(--shadow-gold);
}

/* Badges & Trust Ribbons */
.badge-cleanroom {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--champ-gold);
  background: rgba(197, 160, 89, 0.12);
  border: 1px solid var(--champ-border);
  padding: 5px 14px;
  border-radius: 24px;
}

.trust-ribbon {
  background: var(--plum-deep);
  color: #F0E8ED;
  padding: 14px 0;
  border-top: 1px solid var(--border-line-dark);
  border-bottom: 1px solid var(--border-line-dark);
}
.trust-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 16px 36px;
  font-size: 13.5px;
  font-family: var(--font-mono);
  letter-spacing: 0.5px;
}
.trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
}
.trust-item b {
  color: var(--champ-bright);
}

/* Standard Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--plum-deep), var(--plum-rich));
  color: #FFFFFF !important;
  font-size: 16px;
  font-weight: 700;
  padding: 16px 32px;
  border-radius: 10px;
  border: 1px solid var(--champ-border);
  box-shadow: var(--shadow-md);
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}
.btn-gold {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, var(--champ-gold), var(--champ-bright));
  color: var(--plum-dark) !important;
  font-size: 16px;
  font-weight: 700;
  padding: 16px 32px;
  border-radius: 10px;
  box-shadow: var(--shadow-md);
  transition: transform 0.15s, box-shadow 0.15s;
}
.btn-gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(197, 160, 89, 0.35);
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: transparent;
  color: var(--plum-dark);
  font-size: 16px;
  font-weight: 600;
  padding: 15px 30px;
  border-radius: 10px;
  border: 1.5px solid var(--border-line);
  transition: all 0.15s;
}
.btn-secondary:hover {
  border-color: var(--champ-gold);
  background: rgba(197, 160, 89, 0.05);
}

/* Sections */
section {
  padding: 80px 0;
}
.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 52px;
}
.section-subtitle {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--berry-vibrant);
  margin-bottom: 12px;
}
.section-title {
  font-size: 38px;
  line-height: 1.2;
  margin: 0 0 16px;
  color: var(--plum-dark);
}
.section-desc {
  font-size: 18px;
  color: var(--text-muted);
  margin: 0;
}

/* 3-Step Sample Kit & RFQ Configurator Box */
.interactive-configurator {
  background: var(--bg-pure);
  border: 1.5px solid var(--champ-border);
  border-radius: 20px;
  padding: 44px;
  box-shadow: var(--shadow-lg);
  margin-top: 40px;
}
.step-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--plum-dark);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--plum-deep);
  color: var(--champ-bright);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}
.options-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 30px;
}
.option-card {
  border: 1.5px solid var(--border-line);
  background: var(--bg-cleanroom);
  border-radius: 12px;
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
.option-card:hover {
  border-color: var(--champ-gold);
  transform: translateY(-2px);
}
.option-card.selected {
  border-color: var(--berry-vibrant);
  background: rgba(138, 43, 82, 0.04);
  box-shadow: 0 0 0 1px var(--berry-vibrant);
}
.option-card-title {
  font-weight: 700;
  font-size: 16px;
  color: var(--plum-dark);
  margin-bottom: 4px;
}
.option-card-sub {
  font-size: 13px;
  color: var(--text-muted);
}

/* Spec Data Tables */
.spec-table {
  width: 100%;
  border-collapse: collapse;
  background: #FFFFFF;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-line);
  box-shadow: var(--shadow-sm);
  margin: 24px 0;
}
.spec-table th {
  background: var(--plum-deep);
  color: #F4E8EE;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 16px 20px;
  text-align: left;
}
.spec-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-line);
  font-size: 15px;
}
.spec-table tr:last-child td {
  border-bottom: none;
}
.spec-table tr:nth-child(even) td {
  background: #FCFAF8;
}

/* FAQ Accordion Styling */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.faq-card {
  background: #FFFFFF;
  border: 1px solid var(--border-line);
  border-radius: 14px;
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
}
.faq-card h3 {
  margin: 0 0 10px;
  font-size: 18px;
  color: var(--plum-dark);
}
.faq-card p {
  margin: 0;
  font-size: 15.5px;
  color: var(--text-body);
}

/* Footer Styling */
.site-footer {
  background: var(--plum-dark);
  color: #C0A8B6;
  padding: 60px 0 40px;
  border-top: 1px solid var(--border-line-dark);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}
.footer-brand h4 {
  font-family: var(--font-serif);
  font-size: 26px;
  letter-spacing: 6px;
  color: #FAF8F5;
  margin: 0 0 14px;
}
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--champ-bright);
  margin: 0 0 18px;
}
.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 14px;
}
.footer-links a:hover {
  color: #FFFFFF;
}
.footer-bottom {
  border-top: 1px solid var(--border-line-dark);
  padding-top: 24px;
  text-align: center;
  font-size: 13px;
  color: #8C7583;
}

/* Responsive */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section-title { font-size: 30px; }
  .header-nav .nav-menu { display: none; }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; }
  .interactive-configurator { padding: 24px; }
  .options-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 26px; }
}