/* Reset & Base */
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  color: #172033;
  background-color: #f8fafc;
  line-height: 1.55;
}
a { color: #0f766e; text-decoration: none; }

/* 1. Thanh điều hướng cố định khi cuộn trang (Sticky Nav) */
nav.sticky-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #0f766e;
  color: #ffffff;
  padding: 12px 24px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}
.nav-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1280px;
  margin: 0 auto;
  flex-wrap: wrap;
  gap: 12px;
}
.brand-logo { font-size: 20px; font-weight: 700; color: #ccfbf1; }
ul.nav-menu {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 16px;
  flex-wrap: wrap;
}
ul.nav-menu li a {
  color: #ffffff;
  font-weight: 600;
  font-size: 13.5px;
  padding: 5px 10px;
  border-radius: 4px;
}
ul.nav-menu li a:hover { background: #115e59; }

/* 2. Main Layout chia cột Flexbox */
main.product-page-main {
  padding: 24px;
  max-width: 1280px;
  margin: 0 auto;
  min-height: 900px;
}
.product-two-cols {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  flex-wrap: wrap;
}
.col-product-details {
  flex: 3.5 1 660px;
}

/* Khối định vị Relative và các phần tử con Absolute */
.product-visual-box {
  position: relative;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 30px 24px;
  margin-bottom: 20px;
}
.abs-badge {
  position: absolute;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}
.badge-discount {
  top: 14px;
  left: 14px;
  background: #dc2626;
  color: #ffffff;
}
.badge-tech {
  top: 14px;
  right: 14px;
  background: #0284c7;
  color: #ffffff;
}
.product-visual-box h2 { margin: 16px 0 8px; font-size: 22px; color: #0f172a; }
.product-tagline { margin: 0 0 12px; font-size: 14px; color: #475569; }
.product-pricing { margin: 0; font-size: 18px; }
.product-pricing del { color: #94a3b8; margin-right: 10px; }
.product-pricing ins { color: #dc2626; font-weight: 700; text-decoration: none; }

/* Nút nổi Absolute */
.abs-btn.floating-buy-action {
  position: absolute;
  bottom: 16px;
  right: 16px;
  background: #0f766e;
  color: #ffffff;
  font-weight: 700;
  font-size: 13.5px;
  padding: 10px 18px;
  border-radius: 6px;
  display: inline-block;
  box-shadow: 0 4px 12px rgba(15, 118, 110, 0.3);
}
.abs-btn.floating-buy-action:hover { background: #115e59; }

/* 3. Khối hover tương tác kết hợp display và position */
.size-guide-interactive {
  position: relative;
  margin-bottom: 20px;
}
.hover-trigger-badge {
  display: inline-block;
  background: #f0fdfa;
  color: #0f766e;
  border: 1px dashed #0f766e;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: help;
}
.hover-popup-table {
  display: none;
  position: absolute;
  top: 110%;
  left: 0;
  z-index: 50;
  background: #1e293b;
  color: #ffffff;
  padding: 16px;
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  width: 320px;
}
.size-guide-interactive:hover .hover-popup-table {
  display: block;
}
.hover-popup-table h4 { margin: 0 0 8px; font-size: 13.5px; color: #ccfbf1; }
.size-data-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.size-data-table th, .size-data-table td { border: 1px solid #475569; padding: 4px 8px; text-align: center; }
.size-data-table th { background: #334155; }

/* 4. 6 Thẻ Flexbox kích thước không đều */
.specs-flex-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  align-items: stretch;
  gap: 16px;
}
.spec-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  padding: 14px 16px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.spec-card.s1 { flex: 2.7 1 330px; }
.spec-card.s2 { flex: 1 1 160px; }
.spec-card.s3 { flex: 1.4 1 200px; align-self: flex-start; }
.spec-card.s4 { flex: 2 1 250px; }
.spec-card.s5 { flex: 1.1 1 170px; }
.spec-card.s6.featured-spec {
  flex: 2.5 1 310px;
  order: -1;
  background: #f0fdfa;
  border-color: #99f6e4;
}
.inline-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  background: #e2e8f0;
  color: #475569;
  margin-bottom: 6px;
}
.highlight-label { background: #ccfbf1; color: #0f766e; }
.spec-card h3 { margin: 0 0 6px; font-size: 15px; color: #0f172a; }
.spec-card p { margin: 0; font-size: 13px; color: #475569; }

/* Display none */
.stock-status-hidden { display: none; }

/* 5. Cột phụ Sticky và Iframe */
aside.col-sticky-review {
  flex: 1 1 280px;
  position: sticky;
  top: 70px;
  align-self: flex-start;
  background: #ffffff;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 18px;
}
aside.col-sticky-review h3 { margin: 0 0 8px; font-size: 15px; color: #0f766e; }
aside.col-sticky-review p { margin: 0 0 12px; font-size: 13px; color: #64748b; }
.embedded-video {
  width: 100%;
  height: 180px;
  border: none;
  border-radius: 6px;
  margin-bottom: 14px;
}
.sidebar-policy-box h4 { margin: 0 0 6px; font-size: 13.5px; color: #1e293b; }
.sidebar-policy-box ul { margin: 0; padding-left: 18px; font-size: 12.5px; color: #475569; }
.sidebar-policy-box li { margin-bottom: 4px; }

/* 6. Footer */
footer.product-footer {
  background: #115e59;
  color: #ccfbf1;
  padding: 28px 24px;
  margin-top: 40px;
}
.footer-wrapper {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
}
.footer-col { flex: 1 1 220px; }
.footer-col h4 { margin: 0 0 10px; font-size: 15px; color: #ffffff; }
.footer-col p { margin: 0; font-size: 13px; color: #ccfbf1; }
.footer-col ul { list-style: none; margin: 0; padding: 0; font-size: 13px; }
.footer-col ul li { margin-bottom: 6px; color: #ccfbf1; }