/* 东创IT顾问 · 全站通用顶栏
 * 官网（/）与弱电工具库（/tools/）共用同一套顶栏，保证品牌与导航一致。
 * 设计令牌（颜色/圆角/宽度）由各页面的 style.css 提供。
 */

.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(250, 250, 250, .92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  padding-top: env(safe-area-inset-top);
}
.site-bar {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 18px;
  height: 64px;
  padding-left: max(22px, env(safe-area-inset-left));
  padding-right: max(22px, env(safe-area-inset-right));
}
.site-logo { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.site-logo-mark {
  width: 34px; height: 34px; border-radius: 9px; flex: none;
  display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 15px;
  background: linear-gradient(135deg, var(--brand), var(--tech));
}
.site-logo b { font-size: 16.5px; letter-spacing: .3px; }
.site-logo small { display: block; font-size: 11px; color: var(--ink-3); font-weight: 400; line-height: 1.2; }

.site-menu { display: flex; gap: 28px; }
.site-menu a { color: var(--ink-2); font-size: 14.5px; padding: 6px 2px; position: relative; text-decoration: none; }
.site-menu a:hover { color: var(--ink); }
.site-menu a.active { color: var(--brand); font-weight: 600; }
.site-menu a.active::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 2px; border-radius: 2px; background: var(--brand);
}
.site-cta {
  display: inline-block; padding: 10px 20px; border-radius: 10px; flex: none;
  background: var(--brand); color: #fff; font-size: 14.5px; font-weight: 600;
  text-decoration: none; transition: background .2s;
}
.site-cta:hover { background: #1749b4; }

@media (pointer: coarse) {
  .site-cta { padding: 13px 20px; }
  .site-menu a { padding: 12px 2px; }
  .site-logo { padding: 5px 0; }
}

@media (max-width: 820px) {
  .site-bar { height: auto; flex-wrap: wrap; padding-top: 9px; padding-bottom: 9px; row-gap: 4px; }
  .site-menu {
    order: 3; width: 100%; gap: 18px;
    overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none;
  }
  .site-menu::-webkit-scrollbar { display: none; }
  .site-menu a { white-space: nowrap; padding: 8px 2px; }
  .site-cta { display: none; }
}

@media (max-width: 480px) {
  .site-bar {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
    gap: 10px;
  }
  .site-logo small { display: none; }
  .site-logo b { font-size: 15.5px; }
}