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

body {
  font-family: Arial, Helvetica, sans-serif;
  color: #333;
  background: #fff;
  line-height: 1.6;
}

header {
  background: #fff;
  border-bottom: 1px solid #eee;
}

.logo-bar {
  padding: 20px 40px;
}

.logo-bar {
  background-image: url("ustbg.gif");
  background-repeat: repeat-x;
}

.logo-bar a {
  display: inline-block;
}

.logo-bar img {
  height: 48px;
  display: block;
}

.hero {
  width: 100%;
  height: 320px;
  background-image: url("s1.jpg");
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  text-align: center;
}

.hero.hero-alt {
  background-image: url("s3.jpg");
}

.hero h2 {
  font-size: 24px;
  font-weight: normal;
  padding: 0 20px;
}

nav {
  background: #2e7d6e;
}

nav ul {
  display: flex;
  list-style: none;
  flex-wrap: wrap;
  max-width: 1200px;
  margin: 0 auto;
}

nav li a {
  display: block;
  padding: 16px 24px;
  color: #fff;
  text-decoration: none;
  font-weight: bold;
  font-size: 14px;
  letter-spacing: 1px;
}

nav li a:hover, nav li a.active {
  background: #245d52;
}

main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 40px 20px;
}

main h1 {
  color: #2e7d6e;
  border-bottom: 2px solid #2e7d6e;
  padding-bottom: 10px;
  margin-bottom: 20px;
  font-size: 22px;
}

main p {
  margin-bottom: 16px;
  text-align: justify;
}

.product-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
  list-style: none;
  margin: 20px 0;
}

.product-list li {
  background: #f4f8f7;
  border-left: 4px solid #2e7d6e;
  padding: 10px 14px;
  font-weight: bold;
}

.brand-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 10px;
  list-style: none;
  margin: 10px 0 20px;
}

.brand-list li {
  background: #fff;
  border: 1px solid #ddd;
  padding: 10px 14px;
  text-align: center;
}

.tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

.tabs a {
  padding: 8px 18px;
  background: #f4f8f7;
  border: 1px solid #2e7d6e;
  color: #2e7d6e;
  text-decoration: none;
  font-weight: bold;
  border-radius: 4px;
}

.tabs a.active {
  background: #2e7d6e;
  color: #fff;
}

.contact-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 20px;
}

.contact-table th, .contact-table td {
  text-align: left;
  padding: 8px 12px;
  border-bottom: 1px solid #eee;
  vertical-align: top;
}

.contact-table th {
  width: 140px;
  color: #2e7d6e;
}

.order-form label {
  display: block;
  margin-top: 12px;
  font-weight: bold;
}

.order-form input, .order-form select, .order-form textarea {
  width: 100%;
  padding: 8px;
  margin-top: 4px;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-family: inherit;
}

.order-form button {
  margin-top: 20px;
  padding: 10px 30px;
  background: #2e7d6e;
  color: #fff;
  border: none;
  border-radius: 4px;
  font-weight: bold;
  cursor: pointer;
}

footer {
  text-align: center;
  padding: 20px;
  background: #f4f8f7;
  color: #777;
  font-size: 13px;
  margin-top: 40px;
}