/* ============================================================
   招聘雷达 · 全站统一顶栏导航 (site-nav)
   与各页共享 CSS 变量；未定义处用 fallback，保证独立可用。
   ============================================================ */

:root {
  /* 语义 z-index 尺度（避免 9999 魔法值） */
  --z-nav: 900;
  --z-nav-dropdown: 950;
  --z-nav-mobile: 940;
}

/* 顶栏为 fixed，给 body 让出高度 */
body { padding-top: 58px; }

.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 58px;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 20px;
  background: var(--card-solid, #ffffff);
  border-bottom: 1px solid var(--border, rgba(0,0,0,.08));
  font-family: "Hanken Grotesk", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}
[data-theme="dark"] .site-nav { background: var(--card-solid, #0f172a); }

/* --- 品牌区（唯一使用渐变的“签名时刻”）--- */
.sn-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  padding-right: 8px;
  margin-right: 4px;
  flex-shrink: 0;
}
.sn-logo {
  width: 32px; height: 32px;
  border-radius: 9px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #ec4899 100%);
  color: #fff;
  box-shadow: 0 2px 10px -2px rgba(99,102,241,.55);
}
.sn-logo svg { width: 19px; height: 19px; }
.sn-word { display: flex; flex-direction: column; line-height: 1.05; }
.sn-word b {
  font-size: 15px; font-weight: 800; letter-spacing: -.2px;
  color: var(--text, #0f172a);
}
.sn-word span {
  font-size: 9.5px; font-weight: 600; letter-spacing: 1.5px;
  color: var(--text-faint, #94a3b8); text-transform: uppercase;
}

/* --- 主导航组 --- */
.sn-groups { display: flex; align-items: center; gap: 2px; }
.sn-group { position: relative; }

.sn-trigger, .sn-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 38px;
  padding: 0 13px;
  border: none;
  border-radius: 10px;
  background: transparent;
  color: var(--text-soft, #475569);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background .16s ease, color .16s ease;
}
.sn-trigger svg, .sn-link svg { width: 17px; height: 17px; flex-shrink: 0; }
.sn-trigger .sn-caret { width: 14px; height: 14px; opacity: .55; transition: transform .18s ease; }
.sn-group[data-open="true"] .sn-caret { transform: rotate(180deg); }

.sn-trigger:hover, .sn-link:hover,
.sn-trigger:focus-visible, .sn-link:focus-visible {
  background: var(--card-2, rgba(0,0,0,.04));
  color: var(--text, #0f172a);
  outline: none;
}
.sn-trigger:focus-visible, .sn-link:focus-visible {
  box-shadow: 0 0 0 2px var(--accent, #6366f1);
}

/* 当前所在的组 / 链接 高亮 */
.sn-group.is-active > .sn-trigger,
.sn-link.is-active {
  color: var(--accent, #6366f1);
  background: color-mix(in srgb, var(--accent, #6366f1) 12%, transparent);
}

/* --- 下拉面板 --- */
.sn-menu {
  position: fixed;
  min-width: 264px;
  padding: 8px;
  background: var(--card-solid, #fff);
  border: 1px solid var(--border, rgba(0,0,0,.08));
  border-radius: 14px;
  box-shadow: 0 16px 40px -12px rgba(15,23,42,.28), 0 4px 10px -4px rgba(15,23,42,.12);
  opacity: 0;
  transform: translateY(-6px) scale(.98);
  transform-origin: top left;
  pointer-events: none;
  visibility: hidden;
  transition: opacity .17s ease, transform .17s cubic-bezier(.2,.8,.2,1), visibility .17s;
  z-index: var(--z-nav-dropdown);
}
/* 透明桥：补上触发器与菜单之间的 8px 悬停空隙 */
.sn-menu::after { content: ''; position: absolute; left: 0; right: 0; top: -12px; height: 12px; }
.sn-group[data-open="true"] .sn-menu {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
  visibility: visible;
}
.sn-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 9px 11px;
  border-radius: 10px;
  text-decoration: none;
  color: var(--text, #0f172a);
  transition: background .14s ease;
}
.sn-item:hover, .sn-item:focus-visible {
  background: var(--card-2, rgba(99,102,241,.08));
  outline: none;
}
.sn-item-ico {
  width: 34px; height: 34px;
  flex-shrink: 0;
  border-radius: 9px;
  display: grid; place-items: center;
  background: var(--card-2, rgba(99,102,241,.09));
  color: var(--accent, #6366f1);
}
.sn-item-ico svg { width: 18px; height: 18px; }
.sn-item-tx { display: flex; flex-direction: column; min-width: 0; }
.sn-item-tx b { font-size: 13.5px; font-weight: 700; display: flex; align-items: center; gap: 5px; }
.sn-item-tx b svg { width: 12px; height: 12px; opacity: .5; }
.sn-item-tx small { font-size: 11px; color: var(--text-faint, #94a3b8); font-weight: 500; margin-top: 1px; }
.sn-item.is-active { background: color-mix(in srgb, var(--accent, #6366f1) 12%, transparent); }
.sn-item.is-active .sn-item-ico {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
}

/* --- 右侧工具区 --- */
.sn-spacer { flex: 1; }
.sn-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.sn-icon-btn {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border: 1px solid var(--border, rgba(0,0,0,.08));
  border-radius: 10px;
  background: transparent;
  color: var(--text-soft, #475569);
  cursor: pointer;
  transition: background .16s ease, color .16s ease, border-color .16s ease;
}
.sn-icon-btn:hover { background: var(--card-2, rgba(0,0,0,.04)); color: var(--text, #0f172a); }
.sn-icon-btn:focus-visible { outline: none; box-shadow: 0 0 0 2px var(--accent, #6366f1); }
.sn-icon-btn svg { width: 18px; height: 18px; }
.sn-lang {
  min-width: 44px; width: auto; padding: 0 11px;
  font-family: inherit; font-size: 13px; font-weight: 800;
  letter-spacing: .5px; color: var(--accent, #6366f1);
}

/* --- 移动端汉堡 --- */
.sn-burger { display: none; }
.sn-mobile { display: none; }

@media (max-width: 860px) {
  body { padding-top: 54px; }
  .site-nav { height: 54px; padding: 0 14px; }
  .sn-groups { display: none; }
  .sn-burger {
    display: grid; place-items: center;
    width: 38px; height: 38px; border: none; border-radius: 10px;
    background: transparent; color: var(--text, #0f172a); cursor: pointer;
  }
  .sn-burger svg { width: 22px; height: 22px; }
  .sn-word span { display: none; }

  /* 移动抽屉 */
  .sn-mobile {
    display: block;
    position: fixed;
    top: 54px; left: 0; right: 0; bottom: 0;
    z-index: var(--z-nav-mobile);
    background: var(--bg, #f5f7fb);
    padding: 16px;
    overflow-y: auto;
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
  }
  .sn-mobile.open { opacity: 1; visibility: visible; transform: translateY(0); }
  .sn-mobile h4 {
    font-size: 11px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase;
    color: var(--text-faint, #94a3b8); margin: 18px 6px 8px;
  }
  .sn-mobile h4:first-child { margin-top: 4px; }
  .sn-mobile .sn-item { padding: 12px; }
}

/* --- 隐藏各页遗留的孤立“返回/主题/语言”控件（导航已统一接管）---
   site-nav.css 仅在带导航的页面加载，故可放心按 id 隐藏。 */
.back-btn, .t-back-btn, #theme-btn, #lang-toggle {
  display: none !important;
}

@media (prefers-reduced-motion: reduce) {
  .sn-menu, .sn-caret, .sn-mobile, .sn-icon-btn, .sn-trigger, .sn-link, .sn-item { transition: none !important; }
}