/* ============================================================
   秦网科技 — isolated dark nav + footer for product-detail pages.
   Prefixed .sb-* classes so it never collides with the page's
   own Bootstrap (.nav / .btn / .container). Self-contained.
   ============================================================ */
.sb-nav, .sb-nav *, .sb-foot, .sb-foot * { box-sizing: border-box; }
.sb-nav a, .sb-foot a { text-decoration: none; }

.sb-nav {
  --sb-grad: linear-gradient(120deg, #5B8CFF 0%, #22D3EE 52%, #A855F7 100%);
  position: sticky; top: 0; z-index: 1000;
  background: rgba(9,10,17,.82);
  -webkit-backdrop-filter: saturate(150%) blur(14px);
  backdrop-filter: saturate(150%) blur(14px);
  border-bottom: 1px solid rgba(255,255,255,.09);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}
.sb-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; height: 64px; display: flex; align-items: center; gap: 24px; }
.sb-brand { display: inline-flex; align-items: center; gap: 11px; font-weight: 800; font-size: 1.16rem; letter-spacing: -.02em; color: #fff !important; }
.sb-mark { width: 30px; height: 30px; border-radius: 9px; background: var(--sb-grad); flex: none; box-shadow: 0 6px 18px -6px rgba(91,140,255,.8); }
.sb-links { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.sb-link { position: relative; padding: 9px 16px; border-radius: 10px; font-size: .98rem; font-weight: 500; color: rgba(255,255,255,.72) !important; transition: color .2s, background .2s; }
.sb-link:hover { color: #fff !important; background: rgba(255,255,255,.06); }
.sb-link.is-active { color: #fff !important; }
.sb-link.is-active::after { content: ""; position: absolute; left: 16px; right: 16px; bottom: 3px; height: 2px; border-radius: 2px; background: var(--sb-grad); }
.sb-cta { margin-left: 6px; padding: 10px 20px; border-radius: 999px; background: var(--sb-grad); color: #0A0B12 !important; font-weight: 700; }
.sb-cta:hover { opacity: .93; }

.sb-has-menu { position: relative; }
.sb-menu { position: absolute; top: calc(100% + 12px); right: 0; width: min(680px, 86vw); background: #0E101B; border: 1px solid rgba(255,255,255,.09); border-radius: 16px; box-shadow: 0 20px 50px -24px rgba(0,0,0,.7); padding: 14px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px; opacity: 0; visibility: hidden; transform: translateY(8px); transition: opacity .2s, transform .2s, visibility .2s; }
.sb-has-menu:hover .sb-menu, .sb-has-menu:focus-within .sb-menu { opacity: 1; visibility: visible; transform: none; }
.sb-mi { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 12px; color: rgba(255,255,255,.72) !important; font-size: .94rem; }
.sb-mi:hover { background: rgba(255,255,255,.08); color: #fff !important; }
.sb-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--sb-grad); flex: none; }
.sb-toggle { display: none; margin-left: auto; width: 44px; height: 44px; border: 1px solid rgba(255,255,255,.12); background: rgba(255,255,255,.05); border-radius: 12px; color: #fff; cursor: pointer; }
.sb-toggle svg { width: 22px; height: 22px; margin: auto; display: block; }

.sb-foot {
  --sb-grad: linear-gradient(120deg, #5B8CFF, #22D3EE, #A855F7);
  background: #0E1019; color: #A4A8BE; border-top: 1px solid rgba(255,255,255,.09);
  padding: 56px 0 30px; position: relative; margin-top: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}
.sb-foot::before { content: ""; position: absolute; top: -1px; left: 0; right: 0; height: 1px; background: var(--sb-grad); opacity: .6; }
.sb-fwrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.sb-fgrid { display: flex; flex-wrap: wrap; gap: 40px; justify-content: space-between; }
.sb-fbrand { max-width: 320px; }
.sb-fbrand p { color: #6C7088; font-size: .92rem; margin: 14px 0 0; line-height: 1.7; }
.sb-fcol h4 { font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; color: #6C7088; font-weight: 600; margin: 0 0 4px; }
.sb-fcol a { display: block; color: #A4A8BE !important; padding: 6px 0; font-size: .95rem; }
.sb-fcol a:hover { color: #fff !important; }
.sb-fbottom { max-width: 1200px; margin: 44px auto 0; padding: 22px 24px 0; border-top: 1px solid rgba(255,255,255,.09); display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center; justify-content: center; text-align: center; color: #6C7088; font-size: .86rem; }
.sb-fbottom a { color: #6C7088 !important; }
.sb-fbottom a:hover { color: #A4A8BE !important; }

@media (max-width: 860px) {
  .sb-links { position: fixed; inset: 64px 0 auto 0; flex-direction: column; align-items: stretch; gap: 2px; background: #0C0E17; border-bottom: 1px solid rgba(255,255,255,.09); padding: 14px 18px 22px; margin: 0; transform: translateY(-145%); transition: transform .3s ease; max-height: calc(100vh - 64px); overflow-y: auto; }
  .sb-links.open { transform: none; }
  .sb-link { padding: 13px 14px; font-size: 1.05rem; }
  .sb-link.is-active::after { display: none; }
  .sb-cta { margin: 8px 14px 0; text-align: center; }
  .sb-toggle { display: grid; place-items: center; }
  .sb-has-menu .sb-menu { position: static; width: auto; opacity: 1; visibility: visible; transform: none; box-shadow: none; background: transparent; border: 0; padding: 6px 0; grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) { .sb-links, .sb-menu { transition: none !important; } }