:root {
  --blue-light: #87ceeb;
  --dark-green-black: #0d1b1e;
  --text-light: #ffffff;
  --orange: #ff5722;
}

body {
  font-family: "Open Sans", sans-serif;
  background: #f5f5f5;
  margin: 0;
  color: #222;
}

/* ===== Header ===== */
.site-header {
  background: var(--dark-green-black);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 1000;
}
.container {
  width: 90%;
  max-width: 1200px;
  margin: auto;
}
.flex-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--blue-light);
}
.logo span {
  color: var(--text-light);
}
.menu {
  list-style: none;
  display: flex;
  gap: 20px;
}
.menu a {
  text-decoration: none;
  font-weight: 600;
  color: var(--text-light);
  transition: 0.3s;
}
.menu a:hover {
  color: var(--blue-light);
}
.menu-toggle {
  display: none;
  font-size: 24px;
  background: var(--blue-light);
  color: var(--dark-green-black);
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  font-size: 0.9rem;
  margin: 20px auto;
  width: 90%;
  max-width: 1200px;
  color: #555;
}
.breadcrumb a {
  text-decoration: none;
  color: var(--blue-light);
}

/* ===== Layout ===== */
.content {
  display: flex;
  gap: 30px;
  margin: 20px auto 40px;
  width: 90%;
  max-width: 1200px;
}
.main-column {
  flex: 0 0 70%;
}
.sidebar {
  flex: 0 0 30%;
}

/* ===== Bài review ===== */
.post-detail {
  background: #fff;
  border-radius: 10px;
  padding: 20px 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}
.post-detail h1 {
  font-size: 1.8rem;
  color: var(--dark-green-black);
  margin-bottom: 14px;
}
.post-detail h2 {
  font-size: 1.3rem;
  color: var(--orange);
  margin: 22px 0 10px;
}
.post-detail p, .lead {
  line-height: 1.6;
  color: #444;
}
.hero img {
  width: 100%;
  border-radius: 10px;
  margin: 12px 0;
}
.gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 16px 0 22px;
}
.gallery img {
  width: 100%;
  border-radius: 8px;
}
.btn-cta {
  display: inline-block;
  background: var(--orange);
  color: #fff !important;
  padding: 10px 18px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 700;
  transition: 0.2s;
}
.btn-cta:hover {
  background: #e64a19;
  transform: translateY(-2px);
}

/* ===== Sidebar gợi ý ===== */
.sidebar-box {
  background: #fff;
  padding: 15px;
  border-radius: 10px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.sidebar-box h3 {
  font-size: 1.1rem;
  margin-bottom: 15px;
  color: var(--orange);
}
.suggest-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 8px;
  transition: background 0.3s;
}
.suggest-item:hover {
  background: #fafafa;
}
.suggest-item img {
  width: 60px;
  height: 60px;
  border-radius: 8px;
  object-fit: cover;
}
.product-name {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 600;
  color: #333;
  line-height: 1.3;
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .content {
    flex-direction: column;
  }
  .main-column, .sidebar {
    flex: 0 0 100%;
    max-width: 100%;
  }
  .gallery {
    grid-template-columns: 1fr;
  }
}
@media (max-width: 768px) {
  .menu {
    display: none;
    flex-direction: column;
    background: var(--dark-green-black);
    position: absolute;
    top: 60px;
    right: 20px;
    width: 200px;
    padding: 15px;
    border-radius: 6px;
  }
  .menu.show { display: flex; }
  .menu-toggle { display: inline-block; }
}