/* ══════════════════════════════════════════════════
   HEADER & NAVIGATION
   导航栏样式 - 包含顶部栏、主导航、下拉菜单、移动端菜单
══════════════════════════════════════════════════ */

/* ─── NAVBAR ──────────────────────────────────────────────── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  transition: background .4s, backdrop-filter .4s, box-shadow .4s;
}
#navbar.scrolled {
  background: rgba(248,250,252,.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}

/* ─── TOPBAR ──────────────────────────────────────────────── */
.topbar {
  text-align: right; padding: .4rem var(--px);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--muted);
  transition: max-height .3s, opacity .3s;
  max-height: 2rem; overflow: hidden;
}
#navbar.scrolled .topbar { max-height: 0; opacity: 0; }

/* ─── NAV INNER ───────────────────────────────────────────── */
.nav-inner {
  max-width: var(--max-w); margin: 0 auto;
  padding: 0 var(--px);
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}

/* ─── LOGO ────────────────────────────────────────────────── */
.logo { display: flex; align-items: center; gap: .6rem; }
.logo-icon {
  width: 32px; height: 32px; border-radius: 6px;
  background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; font-size: 13px;
}
.logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700; font-size: 18px; letter-spacing: -.02em;
  color: var(--fg);
}

/* ─── NAV LINKS ───────────────────────────────────────────── */
.nav-links { display: flex; align-items: center; gap: .25rem; }
.nav-links a, .nav-btn {
  padding: .5rem .75rem; font-size: 14px; font-weight: 500;
  color: rgba(30,41,59,.8); border-radius: 8px;
  transition: color .2s, background .2s;
  display: flex; align-items: center; gap: 4px; position: relative;
}
.nav-links a:hover, .nav-btn:hover { color: var(--primary); background: var(--cyan); }
.nav-btn svg { transition: transform .2s; }
.nav-btn:hover svg { transform: rotate(180deg); }

/* ─── DROPDOWN ────────────────────────────────────────────── */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute; top: calc(100% + 4px); left: 0;
  background: rgba(255,255,255,.97); backdrop-filter: blur(20px);
  border: .5px solid var(--border); border-radius: 12px;
  box-shadow: 0 20px 40px rgba(0,0,0,.1);
  min-width: 220px; padding: .5rem;
  opacity: 0; pointer-events: none;
  transform: translateY(8px);
  transition: opacity .2s, transform .2s;
}
.dropdown:hover .dropdown-menu { opacity: 1; pointer-events: auto; transform: none; }
.dropdown-menu a {
  display: block; padding: .5rem .75rem; font-size: 13px;
  color: rgba(30,41,59,.7); border-radius: 8px;
  transition: color .15s, background .15s;
}
.dropdown-menu a:hover { color: var(--primary); background: var(--cyan); }

/* ─── NAV ACTIONS ─────────────────────────────────────────── */
.nav-actions { display: flex; align-items: center; gap: .5rem; }
.icon-btn {
  width: 36px; height: 36px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  transition: background .2s;
}
.icon-btn:hover { background: var(--cyan); }
.icon-btn svg { width: 16px; height: 16px; color: rgba(30,41,59,.7); }

/* ─── MOBILE MENU ─────────────────────────────────────────── */
#mobile-toggle { display: none; }
#mobile-menu {
  display: none; background: rgba(255,255,255,.97); backdrop-filter: blur(20px);
  border-top: .5px solid var(--border); padding: 1rem var(--px);
}
#mobile-menu a {
  display: block; padding: .75rem 1rem; font-size: 14px; font-weight: 500;
  color: rgba(30,41,59,.8); border-radius: 8px;
  transition: color .15s, background .15s;
}
#mobile-menu a:hover { color: var(--primary); background: var(--cyan); }

@media (max-width: 1023px) {
  .nav-links { display: none; }
  #mobile-toggle { display: flex; }
  #mobile-menu.open { display: block; }
}
/* v202604211532 */
/* updated-154632 */