/* ==========================================
   Taikang Chemical — taikangchem.com
   Design System v3 — Blue Industrial, 2026-08-11
   ========================================== */

:root {
  --royal: #0d2b6e;
  --royal-dark: #071c4a;
  --royal-light: #1e4fba;
  --accent: #2563eb;
  --surface: #eef2f8;      /* subtle blue-gray alt bg */
  --white: #fafbfc;
  --gray-50: #f4f6f9;
  --gray-100: #eaedf3;
  --gray-200: #d8dde5;
  --gray-300: #c0c6d1;
  --gray-400: #9199a8;
  --gray-500: #6e7687;
  --gray-600: #525a68;
  --gray-700: #3b424d;
  --gray-800: #272c35;
  --gray-900: #181b22;
  --shadow-sm: 0 1px 3px rgba(13,43,110,0.04);
  --shadow-md: 0 4px 20px rgba(13,43,110,0.06);
  --shadow-lg: 0 8px 36px rgba(13,43,110,0.08);
  --shadow-xl: 0 16px 52px rgba(13,43,110,0.10);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
}

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

html { background: var(--gray-50); }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--gray-700);
  line-height: 1.68;
  font-size: 16px;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Animations ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.97); }
  to   { opacity: 1; transform: scale(1); }
}
@keyframes countUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.anim-fade-up   { animation: fadeInUp 0.8s var(--ease-out) both; }
.anim-fade-in   { animation: fadeIn   0.7s var(--ease-out) both; }
.anim-scale-in  { animation: scaleIn  0.6s var(--ease-out) both; }
.anim-d1 { animation-delay: 0.12s; }
.anim-d2 { animation-delay: 0.24s; }
.anim-d3 { animation-delay: 0.36s; }
.anim-d4 { animation-delay: 0.48s; }

/* ── Navbar underline animation ── */
.navbar .nav-links > li > a {
  position: relative;
}
.navbar .nav-links > li > a::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 0;
  width: 0; height: 2px;
  background: #fff;
  transition: width 0.25s var(--ease-out);
}
.navbar .nav-links > li > a:hover::after,
.navbar .nav-links > li > a.active::after { width: 100%; }

/* ── Card lift + glow ── */
.card-lift {
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.card-lift:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

/* ── Button pulse ── */
.btn-pulse {
  animation: pulse 3s infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(37,99,235,0.35); }
  50%      { box-shadow: 0 0 0 12px rgba(37,99,235,0); }
}

/* ── Stat counter animation (triggered on load) ── */
.stat-number {
  animation: countUp 0.8s var(--ease-out) both;
}
.stat-card:nth-child(1) .stat-number { animation-delay: 0.1s; }
.stat-card:nth-child(2) .stat-number { animation-delay: 0.2s; }
.stat-card:nth-child(3) .stat-number { animation-delay: 0.3s; }
.stat-card:nth-child(4) .stat-number { animation-delay: 0.4s; }

/* ── Image zoom on hover ── */
.img-zoom {
  overflow: hidden;
  border-radius: var(--radius-md);
}
.img-zoom img {
  transition: transform 0.7s var(--ease-out);
}
.img-zoom:hover img {
  transform: scale(1.05);
}

/* ── Section stagger auto-reveal via animation-timeline ── */
.feature-item, .pcard, .prod-card, .adv-card, .app-card, .value-card, .feat-card, .cert-card, .contact-card, .stat-card {
  animation: fadeInUp 0.9s var(--ease-out) both;
  animation-timeline: view();
  animation-range: entry 5% entry 100%;
}
@supports not (animation-timeline: view()) {
  .feature-item, .pcard, .prod-card, .adv-card, .app-card, .value-card, .feat-card, .cert-card, .contact-card, .stat-card {
    animation: none;
    opacity: 1;
  }
}

/* ── Top Banner ── */
.top-banner {
  max-width: 1200px; margin: 0 auto;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 40px;
  border-bottom: 1px solid var(--gray-100);
}
.top-banner .brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.top-banner .brand img {
  height: 38px;
  width: auto;
  display: block;
}
.top-banner .brand .names {
  display: flex;
  flex-direction: column;
  line-height: 1.4;
}
.top-banner .brand .names .cn {
  font-size: 17px;
  font-weight: 700;
  color: var(--royal);
  letter-spacing: 0.03em;
}
.top-banner .brand .names .en {
  font-size: 11px;
  font-weight: 500;
  color: var(--gray-500);
  letter-spacing: 0.02em;
}
.top-banner .header-contact {
  display: flex;
  align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--gray-600);
}
.top-banner .header-contact a {
  color: var(--gray-600);
  text-decoration: none;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 5px;
}
.top-banner .header-contact a:hover { color: var(--royal-light); }

/* ── Navbar ── */
.navbar {
  background: var(--royal);
  position: sticky;
  top: 0;
  z-index: 1000;
  max-width: 1200px;
  margin: 0 auto;
}
.navbar .nav-inner {
  display: flex;
  align-items: center;
  height: 48px;
  padding: 0 40px;
}
.navbar .nav-links {
  display: flex;
  gap: 36px;
  list-style: none;
  margin: 0 auto;
}
.navbar .nav-links > li { position: relative; }
.navbar .nav-links > li > a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color 0.2s;
  padding: 4px 0;
}
.navbar .nav-links > li > a:hover,
.navbar .nav-links > li > a.active { color: #fff; }

/* Dropdown */
.navbar .has-dropdown > .dropdown {
  position: absolute;
  top: 100%; left: 50%; transform: translateX(-50%);
  background: #fff; border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  padding: 6px 0; min-width: 180px;
  list-style: none; opacity: 0; visibility: hidden;
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
  z-index: 100;
}
.navbar .has-dropdown:hover > .dropdown { opacity: 1; visibility: visible; }
.navbar .dropdown li a {
  display: block; padding: 10px 20px;
  color: var(--gray-700); font-size: 13px; font-weight: 500;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.navbar .dropdown li a:hover { background: var(--gray-50); color: var(--royal); }

/* Mobile toggle */
.navbar .menu-toggle {
  display: none;
  background: none; border: none;
  font-size: 22px; cursor: pointer;
  color: #fff;
}

/* ── Universal Container ── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 40px;
  padding-right: 40px;
}

/* ── Hero block (shared) ── */
.page-hero {
  background: var(--royal);
  padding: 72px 0 56px;
  text-align: center;
  color: #fff;
  max-width: 1200px; margin: 0 auto;
}
.page-hero h1 {
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.02em;
  animation: fadeInUp 0.5s var(--ease-out) both;
}
.page-hero .subtitle {
  font-size: 16px; opacity: 0.85; max-width: 560px; margin: 10px auto 0;
  animation: fadeInUp 0.5s 0.1s var(--ease-out) both;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--accent); color: #fff;
  padding: 13px 30px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px; text-decoration: none;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out), background 0.2s;
}
.btn-primary:hover { background: var(--royal-light); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 2px solid rgba(255,255,255,0.4); color: #fff;
  padding: 13px 30px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px; text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,0.08); }
.btn-white {
  display: inline-block; background: #fff; color: var(--royal);
  padding: 13px 30px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 14px; text-decoration: none;
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s var(--ease-out);
}
.btn-white:hover { transform: translateY(-1px); box-shadow: var(--shadow-md); }

/* ── Section tags ── */
.section-tag {
  display: inline-block;
  font-size: 11px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 2px;
  color: var(--royal-light);
  margin-bottom: 8px;
}

/* ── Footer ── */
.site-footer {
  max-width: 1200px; margin: 0 auto;
  background: var(--gray-900);
  color: #fff;
  padding: 48px 40px 24px;
}
.site-footer a { color: var(--gray-400); text-decoration: none; transition: color 0.2s; }
.site-footer a:hover { color: #fff; }
.footer-grid {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px; padding-bottom: 32px;
}
.footer-grid h4 { font-size: 12px; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 14px; color: #fff; }
.footer-grid p  { font-size: 13px; color: var(--gray-400); line-height: 1.8; }
.copyright {
  max-width: 1200px; margin: 0 auto; padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 12px; color: var(--gray-500); text-align: center;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding-left: 20px; padding-right: 20px; }
  .navbar .nav-inner { padding: 0 20px; }
  .site-footer { padding: 40px 20px 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .top-banner {
    padding: 10px 20px;
    flex-wrap: wrap; gap: 8px;
  }
  .top-banner .brand img { height: 32px; }
  .top-banner .brand .names .cn { font-size: 15px; }
  .top-banner .header-contact { gap: 12px; font-size: 11px; }
  .navbar .menu-toggle { display: block; }
  .navbar .nav-links {
    display: none;
    position: absolute; top: 48px; left: 0; right: 0;
    background: var(--royal-dark); flex-direction: column;
    padding: 12px 24px; gap: 0;
    box-shadow: var(--shadow-md);
  }
  .navbar .nav-links.open { display: flex; }
  .navbar .nav-links > li > a { padding: 12px 0; display: block; }
}