/* Reset cơ bản */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #fff8f0;
  color: #4b342f;
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 20px 10px;
  background-color: #f9e6d3;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.header-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 15px;
  margin-bottom: 10px;
}

.logo {
  width: 60px;
  height: 60px;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

header h1 {
  font-size: 2.8rem;
  color: #d33a2c;
}

#banner {
  position: relative;
  display: inline-block;
  max-width: 700px;
  width: 90%;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 6px 15px rgba(211, 58, 44, 0.3);
}

#banner img {
  width: 100%;
  height: auto;
  display: block;
}

nav {
  margin-top: 20px;
}

nav a {
  color: #d33a2c;
  text-decoration: none;
  margin: 0 12px;
  font-weight: 600;
  font-size: 1.1rem;
  transition: color 0.3s ease;
}

nav a:hover {
  color: #b72f22;
}

section {
  max-width: 900px;
  margin: 30px auto;
  padding: 0 15px;
}

section h2 {
  font-size: 2rem;
  margin-bottom: 15px;
  border-bottom: 3px solid #d33a2c;
  display: inline-block;
  padding-bottom: 5px;
}

.product {
  border: 1px solid #d33a2c;
  border-radius: 10px;
  padding: 15px;
  margin-bottom: 20px;
  text-align: center;
  background-color: #fff2e5;
  box-shadow: 2px 2px 6px rgba(211, 58, 44, 0.2);
}

.product img {
  width: 100%;
  max-width: 300px;
  height: auto;
  margin-bottom: 10px;
  border-radius: 10px;
}

.product h3 {
  color: #b72f22;
  margin-bottom: 8px;
}

.product p {
  font-weight: bold;
  margin-bottom: 12px;
}

button {
  background-color: #d33a2c;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 700;
  font-size: 1rem;
  transition: background-color 0.3s ease;
}

button:hover {
  background-color: #b72f22;
}

#contact p {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

footer {
  text-align: center;
  padding: 15px;
  background-color: #f9e6d3;
  color: #d33a2c;
  font-weight: 600;
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.cart-link {
  font-size: 1.5rem;
  font-weight: bold;
  color: #333;
  text-decoration: underline;
  text-underline-offset: 5px;
  cursor: pointer;
}

.cart-link:hover {
  color: #3366cc;
}

#chat-buttons {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#chat-buttons a img {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: white;
  padding: 5px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s;
}

#chat-buttons a img:hover {
  transform: scale(1.1);
}