:root {
  --color-primary: #0f2942;
  --color-primary-light: #1a4d7a;
  --color-accent: #0d9488;
  --color-accent-light: #14b8a6;
  --color-accent-bg: #f0fdfa;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0a1929;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-light: #94a3b8;
  --color-border: #e2e8f0;
  --color-white: #ffffff;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.10);
  --transition: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

a {
  text-decoration: none;
  color: inherit;
}

ul { list-style: none; }

img { max-width: 100%; }

/* ===== Header ===== */
#header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: var(--transition);
  background: transparent;
}

#header.scrolled {
  background: rgba(255,255,255,0.97);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(8px);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 20px;
  color: var(--color-white);
  transition: var(--transition);
}

#header.scrolled .logo {
  color: var(--color-primary);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  color: var(--color-white);
  border-radius: var(--radius-sm);
  font-size: 18px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  gap: 36px;
}

.nav-links a {
  font-size: 15px;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  transition: var(--transition);
  position: relative;
}

#header.scrolled .nav-links a {
  color: var(--color-text-muted);
}

.nav-links a:hover {
  color: var(--color-accent-light);
}

#header.scrolled .nav-links a:hover {
  color: var(--color-accent);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: var(--transition);
}

.nav-links a:hover::after {
  width: 100%;
}

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-white);
  transition: var(--transition);
  border-radius: 2px;
}

#header.scrolled .menu-toggle span {
  background: var(--color-primary);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, #0a1929 0%, #0f2942 50%, #0a1929 100%);
  overflow: hidden;
  padding: 120px 0 80px;
}

.hero-pattern {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(circle, rgba(13,148,136,0.08) 1px, transparent 1px);
  background-size: 32px 32px;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 820px;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 20px;
  padding: 6px 16px;
  background: rgba(13,148,136,0.12);
  border-radius: 50px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-white);
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.hero-tagline {
  font-size: 20px;
  font-weight: 500;
  color: var(--color-accent-light);
  margin-bottom: 24px;
}

.hero-description {
  font-size: 16px;
  color: rgba(255,255,255,0.75);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 680px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.btn-primary:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(13,148,136,0.35);
}

.btn-outline {
  background: transparent;
  color: var(--color-white);
  border-color: rgba(255,255,255,0.4);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.1);
  border-color: var(--color-white);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

/* ===== Stats Bar ===== */
.stats-bar {
  background: var(--color-accent);
  padding: 40px 0;
}

.stats-container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-number {
  font-size: 32px;
  font-weight: 700;
  color: var(--color-white);
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: rgba(255,255,255,0.8);
  font-weight: 400;
}

/* ===== Section Header ===== */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.5px;
}

.section-description {
  font-size: 16px;
  color: var(--color-text-muted);
  margin-top: 16px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ===== About ===== */
.about {
  padding: 100px 0;
  background: var(--color-bg);
}

.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.about-text p {
  font-size: 16px;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 20px;
}

.about-list {
  margin-top: 24px;
}

.about-list li {
  position: relative;
  padding-left: 28px;
  margin-bottom: 12px;
  color: var(--color-text);
  font-size: 15px;
}

.about-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 8px;
  width: 18px;
  height: 18px;
  background: var(--color-accent-bg);
  border-radius: 50%;
}

.about-list li::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 12px;
  width: 8px;
  height: 4px;
  border-left: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: rotate(-45deg);
}

.about-features {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.feature-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-bg);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  color: var(--color-accent);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== Products ===== */
.products {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.product-filters {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 8px 20px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid var(--color-border);
  background: var(--color-white);
  color: var(--color-text-muted);
  border-radius: 50px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.filter-btn.active {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: var(--color-accent);
}

.product-table-wrapper {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.product-table {
  width: 100%;
  border-collapse: collapse;
}

.product-table thead {
  background: var(--color-primary);
}

.product-table th {
  padding: 18px 28px;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-white);
  letter-spacing: 0.5px;
}

.product-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition);
}

.product-table tbody tr:last-child {
  border-bottom: none;
}

.product-table tbody tr:hover {
  background: var(--color-accent-bg);
}

.product-table td {
  padding: 16px 28px;
  font-size: 15px;
  color: var(--color-text);
}

.category-badge {
  display: inline-block;
  padding: 4px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 50px;
}

.badge-antiparasitic { background: #ccfbf1; color: #0f766e; }
.badge-antibiotic { background: #dbeafe; color: #1e40af; }
.badge-fluoroquinolone { background: #ede9fe; color: #6d28d9; }
.badge-feed-additive { background: #fef3c7; color: #92400e; }
.badge-anthelmintic { background: #dcfce7; color: #166534; }
.badge-peptide { background: #fce7f3; color: #9d174d; }

.product-count {
  text-align: center;
  margin-top: 24px;
  font-size: 14px;
  color: var(--color-text-muted);
}

/* ===== Product Tabs ===== */
.product-tabs {
  display: flex;
  gap: 4px;
  justify-content: center;
  margin-bottom: 40px;
  border-bottom: 2px solid var(--color-border);
}

.tab-btn {
  padding: 14px 32px;
  font-size: 16px;
  font-weight: 600;
  background: none;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  margin-bottom: -2px;
}

.tab-btn:hover {
  color: var(--color-accent);
}

.tab-btn.active {
  color: var(--color-accent);
}

.tab-btn.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--color-accent);
  border-radius: 3px 3px 0 0;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

/* ===== Advantages ===== */
.advantages {
  padding: 100px 0;
  background: var(--color-bg);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.advantage-card {
  text-align: center;
  padding: 48px 32px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: var(--transition);
}

.advantage-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.advantage-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-bg);
  border-radius: 50%;
  margin: 0 auto 24px;
  color: var(--color-accent);
}

.advantage-icon svg {
  width: 30px;
  height: 30px;
}

.advantage-card h3 {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.advantage-card p {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ===== Contact ===== */
.contact {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  border-radius: var(--radius-md);
  color: var(--color-white);
  flex-shrink: 0;
}

.contact-icon svg {
  width: 22px;
  height: 22px;
}

.contact-detail h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.contact-detail p {
  font-size: 15px;
  color: var(--color-text-muted);
}

.contact-form {
  background: var(--color-white);
  padding: 40px;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 15px;
  font-family: var(--font-sans);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  background: var(--color-bg-alt);
  transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  background: var(--color-white);
  box-shadow: 0 0 0 3px rgba(13,148,136,0.1);
}

.form-group textarea {
  resize: vertical;
}

/* ===== Footer ===== */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 64px 0 0;
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}

.footer-brand .logo {
  color: var(--color-white);
  margin-bottom: 16px;
}

.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  line-height: 1.6;
}

.footer h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: 20px;
}

.footer-links ul li {
  margin-bottom: 10px;
}

.footer-links ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  transition: var(--transition);
}

.footer-links ul li a:hover {
  color: var(--color-accent-light);
}

.footer-contact p {
  font-size: 14px;
  color: rgba(255,255,255,0.6);
  margin-bottom: 8px;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 24px 0;
  text-align: center;
}

.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ===== Scroll Top ===== */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 999;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background: var(--color-accent-light);
  transform: translateY(-2px);
}

.scroll-top svg {
  width: 22px;
  height: 22px;
}

/* ===== Reveal Animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 32px; }
  .hero-tagline { font-size: 17px; }
  .hero-description { font-size: 15px; }
  .section-header h2 { font-size: 28px; }

  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--color-white);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
    transform: translateY(-150%);
    transition: var(--transition);
  }

  .nav-links.active {
    transform: translateY(0);
  }

  .nav-links a {
    color: var(--color-text);
  }

  .menu-toggle { display: flex; }

  .stats-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .about-content,
  .contact-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .advantages-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .product-table th,
  .product-table td {
    padding: 14px 16px;
    font-size: 14px;
  }

  .product-tabs {
    flex-wrap: wrap;
  }

  .tab-btn {
    padding: 10px 20px;
    font-size: 14px;
  }

  .contact-form {
    padding: 28px;
  }

  .scroll-top {
    bottom: 20px;
    right: 20px;
  }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 26px; }
  .stat-number { font-size: 26px; }
  .section-header h2 { font-size: 24px; }
  .product-filters { gap: 8px; }
  .filter-btn { padding: 6px 14px; font-size: 13px; }
}