/* =========================================================
   ZHONGBANG PHARM-TECH — BIOPHARMA STATIC SITE STYLESHEET
   Design: Clinical Precision + Organic Science aesthetic
   Palette: Deep teal, warm cream, molecular green accents
   ========================================================= */

:root {
  --c-bg:        #f4f2ec;
  --c-surface:   #ffffff;
  --c-dark:      #0d1f1a;
  --c-teal:      #0a4a3f;
  --c-teal-mid:  #1a6b5c;
  --c-teal-lt:   #2d9c84;
  --c-green:     #4cc98a;
  --c-amber:     #d4a855;
  --c-text:      #1c2b27;
  --c-muted:     #6b8279;
  --c-border:    #d6d0c4;

  --ff-display:  'Cormorant Garamond', Georgia, serif;
  --ff-body:     'DM Sans', sans-serif;
  --ff-mono:     'Space Mono', monospace;

  --radius:      4px;
  --radius-lg:   12px;
  --trans:       0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

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

body {
  font-family: var(--ff-body);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.65;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ── CONTAINER ───────────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

/* ── SECTION SHARED ──────────────────────────────────────── */
.section-tag {
  display: inline-block;
  font-family: var(--ff-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-teal-lt);
  background: rgba(45,156,132,0.08);
  border: 1px solid rgba(45,156,132,0.2);
  padding: 0.3em 0.9em;
  border-radius: 100px;
  margin-bottom: 1rem;
}
.section-header { text-align: center; margin-bottom: 4rem; }
.section-header h2 {
  font-family: var(--ff-display);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  line-height: 1.2;
  margin-bottom: 1rem;
  color: var(--c-dark);
}
.section-header.light h2 { color: #fff; }
.section-header.light p { color: rgba(255,255,255,0.7); }
.section-header p { color: var(--c-muted); max-width: 540px; margin: 0 auto; }

/* ── NAVIGATION ──────────────────────────────────────────── */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(13,31,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(45,156,132,0.15);
  transition: var(--trans);
}
.nav-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 2rem;
  height: 68px;
  display: flex; align-items: center; justify-content: space-between;
}
.logo {
  display: flex; align-items: center; gap: 0.5rem;
  font-family: var(--ff-mono);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  color: #fff;
  font-weight: 400;
}
.logo-hex { color: var(--c-green); font-size: 1.2rem; line-height: 1; }
.logo-text { color: #fff; }
.nav-links {
  display: flex; align-items: center; gap: 2rem;
}
.nav-links a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.04em;
  transition: color var(--trans);
}
.nav-links a:hover { color: var(--c-green); }
.nav-cta {
  background: var(--c-teal-lt);
  color: #fff !important;
  padding: 0.5em 1.2em;
  border-radius: var(--radius);
  transition: background var(--trans) !important;
}
.nav-cta:hover { background: var(--c-green) !important; color: var(--c-dark) !important; }

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: 4px;
}
.hamburger span {
  display: block; width: 22px; height: 1.5px;
  background: rgba(255,255,255,0.8);
  transition: var(--trans);
}
.mobile-menu {
  display: none; flex-direction: column;
  background: var(--c-dark);
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 1rem 2rem 1.5rem;
}
.mobile-menu a {
  color: rgba(255,255,255,0.8);
  padding: 0.6rem 0;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.mobile-menu a:last-child { border-bottom: none; }
.mobile-menu.open { display: flex; }

/* ── HERO ─────────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  background: var(--c-dark);
  display: flex; flex-direction: column;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 120px 2rem 6rem;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
  overflow: hidden;
}
.grid-overlay {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(45,156,132,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45,156,132,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
}
.dna-helix {
  position: absolute; right: -40px; top: 50%; transform: translateY(-50%);
  opacity: 0.12;
  width: 420px; height: 600px;
}
.hero-content {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 0 auto; width: 100%;
}
.hero-tag {
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--c-green);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero-title {
  font-family: var(--ff-display);
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 300;
  color: #fff;
  line-height: 1.05;
  margin-bottom: 1.5rem;
}
.hero-title em {
  font-style: italic;
  color: var(--c-green);
}
.hero-sub {
  max-width: 520px;
  color: rgba(255,255,255,0.6);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 2.5rem;
}
.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 0; }

.btn-primary {
  background: var(--c-teal-lt);
  color: #fff;
  padding: 0.85em 2em;
  border-radius: var(--radius);
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  transition: background var(--trans), transform var(--trans);
  display: inline-block;
  border: none; cursor: pointer; font-family: var(--ff-body);
}
.btn-primary:hover { background: var(--c-green); color: var(--c-dark); transform: translateY(-1px); }
.btn-primary.full { width: 100%; text-align: center; padding: 1em; }

.btn-ghost {
  color: rgba(255,255,255,0.7);
  padding: 0.85em 1.5em;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  font-size: 0.9rem;
  transition: border-color var(--trans), color var(--trans);
  display: inline-block;
}
.btn-ghost:hover { border-color: var(--c-green); color: var(--c-green); }

.hero-stats {
  position: relative; z-index: 1;
  max-width: 1200px; margin: 4rem auto 0;
  display: flex; align-items: center; gap: 0;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.stat {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: center;
  padding: 1.8rem 1rem;
}
.stat-num {
  font-family: var(--ff-display);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--c-green);
  line-height: 1;
  margin-bottom: 0.4rem;
}
.stat-label {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.45);
  letter-spacing: 0.05em;
  text-align: center;
}
.stat-divider {
  width: 1px; height: 40px;
  background: rgba(255,255,255,0.08);
  flex-shrink: 0;
}

/* ── MISSION ─────────────────────────────────────────────── */
.mission { padding: 6rem 0; background: var(--c-bg); }
.mission-grid {
  display: grid;
  grid-template-columns: 180px 1fr 320px;
  gap: 3rem;
  align-items: start;
}
.mission-label { padding-top: 0.5rem; }
.mission-text h2 {
  font-family: var(--ff-display);
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  font-weight: 400;
  line-height: 1.25;
  color: var(--c-dark);
  margin-bottom: 1.2rem;
}
.mission-text h2 em { font-style: italic; color: var(--c-teal-lt); }
.mission-text p { color: var(--c-muted); margin-bottom: 1rem; }

.mission-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.8rem;
  display: flex; flex-direction: column; gap: 1.2rem;
  box-shadow: 0 2px 20px rgba(10,74,63,0.06);
}
.address-block {
  display: flex; gap: 0.8rem; align-items: flex-start;
}
.address-icon { font-size: 1rem; margin-top: 0.1rem; flex-shrink: 0; }
.address-block strong {
  display: block; font-size: 0.8rem; font-weight: 500;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--c-teal);
  margin-bottom: 0.25rem;
}
.address-block p, .address-block a {
  font-size: 0.9rem; color: var(--c-muted); line-height: 1.5;
}
.address-block a:hover { color: var(--c-teal-lt); }

/* ── SERVICES ────────────────────────────────────────────── */
.services { padding: 6rem 0; background: #fff; }
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
.service-card {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2.2rem;
  position: relative;
  transition: transform var(--trans), box-shadow var(--trans);
  overflow: hidden;
}
.service-card::before {
  content: attr(data-index);
  position: absolute; top: 1.5rem; right: 1.8rem;
  font-family: var(--ff-mono);
  font-size: 0.65rem;
  color: var(--c-border);
  letter-spacing: 0.1em;
}
.service-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(10,74,63,0.1);
}
.service-card.featured {
  background: var(--c-teal);
  border-color: var(--c-teal);
  color: #fff;
}
.service-card.featured .service-icon { color: var(--c-green); }
.service-card.featured h3 { color: #fff; }
.service-card.featured p, .service-card.featured li { color: rgba(255,255,255,0.7); }
.service-card.featured::before { color: rgba(255,255,255,0.1); }

.service-icon {
  width: 48px; height: 48px;
  color: var(--c-teal-lt);
  margin-bottom: 1.2rem;
}
.service-icon svg { width: 100%; height: 100%; }
.service-card h3 {
  font-family: var(--ff-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--c-dark);
  margin-bottom: 0.8rem;
}
.service-card p { font-size: 0.92rem; color: var(--c-muted); margin-bottom: 1rem; }
.service-card ul {
  list-style: none;
  display: flex; flex-direction: column; gap: 0.4rem;
}
.service-card li {
  font-size: 0.85rem;
  color: var(--c-muted);
  padding-left: 1.1rem;
  position: relative;
}
.service-card li::before {
  content: '—';
  position: absolute; left: 0;
  color: var(--c-teal-lt);
  font-size: 0.75rem;
}
.featured-badge {
  display: inline-block;
  margin-top: 1.2rem;
  background: rgba(76,201,138,0.15);
  border: 1px solid rgba(76,201,138,0.3);
  color: var(--c-green);
  font-family: var(--ff-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  padding: 0.4em 0.9em;
  border-radius: 100px;
}

/* ── PRODUCTS ────────────────────────────────────────────── */
.products {
  padding: 6rem 0;
  background: var(--c-teal);
  position: relative;
  overflow: hidden;
}
.products::before {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 80% 50%, rgba(76,201,138,0.06) 0%, transparent 60%);
}
.products-grid {
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.product-tile {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 2rem 1.8rem;
  transition: background var(--trans), transform var(--trans);
  animation: fadeUp 0.5s ease both;
  animation-delay: var(--delay, 0s);
}
.product-tile:hover {
  background: rgba(255,255,255,0.08);
  transform: translateY(-3px);
}
.product-icon { font-size: 1.8rem; margin-bottom: 0.8rem; }
.product-tile h4 {
  font-family: var(--ff-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.5rem;
}
.product-tile p { font-size: 0.85rem; color: rgba(255,255,255,0.55); margin-bottom: 1.2rem; }
.product-link {
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--c-green);
  transition: opacity var(--trans);
}
.product-link:hover { opacity: 0.75; }

/* ── CERTIFICATIONS ──────────────────────────────────────── */
.certifications { padding: 6rem 0; background: var(--c-bg); }
.cert-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.cert-card {
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  text-align: center;
  transition: transform var(--trans), box-shadow var(--trans);
}
.cert-card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px rgba(10,74,63,0.08); }
.cert-badge {
  display: inline-block;
  background: var(--c-teal);
  color: var(--c-green);
  font-family: var(--ff-mono);
  font-size: 0.9rem;
  letter-spacing: 0.15em;
  padding: 0.5em 1em;
  border-radius: var(--radius);
  margin-bottom: 1rem;
}
.cert-card h4 {
  font-family: var(--ff-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-dark);
  margin-bottom: 0.5rem;
}
.cert-card p { font-size: 0.85rem; color: var(--c-muted); }

/* ── CONTACT ─────────────────────────────────────────────── */
.contact { padding: 6rem 0; background: #fff; }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: start;
}
.contact-text .section-tag { display: block; margin-bottom: 0.8rem; }
.contact-text h2 {
  font-family: var(--ff-display);
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 400;
  color: var(--c-dark);
  margin-bottom: 1rem;
}
.contact-text p { color: var(--c-muted); margin-bottom: 2rem; }
.contact-details { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 2rem; }
.contact-row {
  display: flex; gap: 1rem; align-items: flex-start;
  font-size: 0.9rem;
}
.contact-label {
  min-width: 70px;
  font-family: var(--ff-mono);
  font-size: 0.72rem;
  color: var(--c-teal-lt);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding-top: 0.15rem;
}
.contact-row a { color: var(--c-teal-lt); }
.contact-row a:hover { color: var(--c-teal); }
.social-links { display: flex; gap: 0.8rem; flex-wrap: wrap; }
.social-btn {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  color: var(--c-text);
  padding: 0.5em 1.1em;
  border-radius: var(--radius);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  transition: border-color var(--trans), color var(--trans);
}
.social-btn:hover { border-color: var(--c-teal-lt); color: var(--c-teal-lt); }

.contact-form {
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}
.contact-form h3 {
  font-family: var(--ff-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--c-dark);
  margin-bottom: 1.5rem;
}
.form-group { margin-bottom: 1.2rem; }
.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-teal);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: #fff;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 0.7em 1em;
  font-family: var(--ff-body);
  font-size: 0.9rem;
  color: var(--c-text);
  transition: border-color var(--trans);
  outline: none;
  -webkit-appearance: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--c-teal-lt);
}
.form-group textarea { resize: vertical; }
.form-success {
  text-align: center;
  color: var(--c-teal-lt);
  font-size: 0.9rem;
  margin-top: 1rem;
}

/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
  background: var(--c-dark);
  padding: 3rem 0 2rem;
}
.footer-inner {
  display: flex; justify-content: space-between; align-items: center;
  flex-wrap: wrap; gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.07);
  margin-bottom: 1.5rem;
}
.footer-brand { display: flex; flex-direction: column; gap: 0.3rem; }
.footer-brand .logo-hex { color: var(--c-green); font-size: 1.3rem; }
.footer-brand .logo-text {
  font-family: var(--ff-mono);
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: #fff;
}
.footer-brand p { font-size: 0.8rem; color: rgba(255,255,255,0.35); margin-top: 0.3rem; }
.footer-links {
  display: flex; gap: 1.5rem; flex-wrap: wrap;
}
.footer-links a {
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
  transition: color var(--trans);
}
.footer-links a:hover { color: var(--c-green); }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem;
}
.footer-bottom p { font-size: 0.78rem; color: rgba(255,255,255,0.25); }
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--c-green); }

/* ── ANIMATIONS ──────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1024px) {
  .mission-grid { grid-template-columns: 1fr 1fr; }
  .mission-label { display: none; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .hero-stats {
    flex-wrap: wrap;
    border-radius: var(--radius);
  }
  .stat { flex: 0 0 50%; border-bottom: 1px solid rgba(255,255,255,0.06); }
  .stat-divider { display: none; }
  .services-grid { grid-template-columns: 1fr; }
  .mission-grid { grid-template-columns: 1fr; }
  .contact-inner { grid-template-columns: 1fr; gap: 2rem; }
  .products-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .cert-grid { grid-template-columns: 1fr; }
  .hero { padding: 100px 1.5rem 4rem; }
  .hero-stats { display: none; }
  .container { padding: 0 1.2rem; }
}