/* ╔══════════════════════════════════════════════╗
   ║   ChinaCNU — Apple-Style Navigation v2      ║
   ╚══════════════════════════════════════════════╝ */

/* ─── Reset header ─────────────────────────────── */
.header_box {
    position: sticky !important;
    top: 0 !important;
    z-index: 9999 !important;
    width: 100% !important;
}

/* ─── Top contact bar: ultra-slim ──────────────── */
.header_t {
    background: #000 !important;
    border-bottom: none !important;
    padding: 0 !important;
    height: 32px !important;
    display: flex !important;
    align-items: center !important;
}
.header_t .sub_wrap {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    max-width: 1200px !important;
    margin: 0 auto !important;
    padding: 0 22px !important;
    width: 100% !important;
}
.header_t_l,
.header_t_r {
    display: flex !important;
    align-items: center !important;
    gap: 18px !important;
}
.header_t_l_item {
    display: flex !important;
    align-items: center !important;
    gap: 5px !important;
    color: rgba(255,255,255,0.55) !important;
    font-size: 11px !important;
    font-weight: 400 !important;
    letter-spacing: 0.3px !important;
    text-decoration: none !important;
    transition: color 0.2s !important;
}
.header_t_l_item:hover { color: rgba(255,255,255,0.9) !important; }
.header_t_l_item .iconfont {
    font-size: 12px !important;
    color: rgba(255,255,255,0.4) !important;
}
.header_t_search,
.header_t_lag_t {
    color: rgba(255,255,255,0.55) !important;
    font-size: 14px !important;
    cursor: pointer !important;
    transition: color 0.2s !important;
}
.header_t_search:hover,
.header_t_lag_t:hover { color: #fff !important; }
.header_t_lag { position: relative !important; }
.header_t_lag_down {
    position: absolute !important;
    top: 100% !important;
    right: 0 !important;
    background: rgba(28,28,30,0.95) !important;
    backdrop-filter: blur(20px) !important;
    border-radius: 8px !important;
    padding: 6px 0 !important;
    min-width: 100px !important;
    display: none !important;
    border: 1px solid rgba(255,255,255,0.1) !important;
}
.header_t_lag:hover .header_t_lag_down { display: block !important; }
.header_t_lag_down a {
    display: block !important;
    padding: 6px 16px !important;
    color: rgba(255,255,255,0.75) !important;
    font-size: 12px !important;
    text-decoration: none !important;
}
.header_t_lag_down a:hover { color: #fff !important; }

/* ─── Main nav bar: Apple style ────────────────── */
.header_b {
    background: rgba(18,18,18,0.92) !important;
    backdrop-filter: saturate(180%) blur(20px) !important;
    -webkit-backdrop-filter: saturate(180%) blur(20px) !important;
    border-bottom: 1px solid rgba(255,255,255,0.08) !important;
    padding: 0 !important;
    height: 52px !important;
    display: flex !important;
    align-items: center !important;
    transition: background 0.3s !important;
}
.header_b .sub_wrap {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    max-width: 1200px !important;
    margin: 0 auto !important;
    padding: 0 22px !important;
    width: 100% !important;
    gap: 0 !important;
}

/* ─── Logo ──────────────────────────────────────── */
.logo {
    display: flex !important;
    align-items: center !important;
    text-decoration: none !important;
    flex-shrink: 0 !important;
}
.logo img {
    height: 30px !important;
    width: auto !important;
}
.logo .pic2 { display: none !important; }

/* ─── Nav menu ──────────────────────────────────── */
.header_b_r {
    display: flex !important;
    align-items: center !important;
    gap: 0 !important;
    flex: 1 !important;
    justify-content: flex-end !important;
}
.menu_dl {
    display: flex !important;
    align-items: center !important;
    list-style: none !important;
    margin: 0 !important;
    padding: 0 !important;
    gap: 0 !important;
}
.menu_dl dd {
    position: relative !important;
    margin: 0 !important;
    padding: 0 !important;
    list-style: none !important;
}
.menu_dl .menu_tt {
    display: flex !important;
    align-items: center !important;
    height: 52px !important;
    padding: 0 13px !important;
    color: rgba(255,255,255,0.75) !important;
    font-size: 12px !important;
    font-weight: 400 !important;
    letter-spacing: 0.5px !important;
    text-decoration: none !important;
    white-space: nowrap !important;
    transition: color 0.2s !important;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif !important;
    text-transform: none !important;
    border-bottom: 2px solid transparent !important;
    box-sizing: border-box !important;
}
.menu_dl dd:hover > .menu_tt,
.menu_dl dd.current > .menu_tt {
    color: #fff !important;
}
.menu_dl dd.current > .menu_tt {
    border-bottom-color: #fff !important;
}

/* ─── Dropdown menus ────────────────────────────── */
.menu_dl .sub_menu,
.menu_dl .menu_sub {
    display: none !important;
    position: absolute !important;
    top: 100% !important;
    left: 50% !important;
    transform: translateX(-50%) !important;
    background: rgba(28,28,30,0.97) !important;
    backdrop-filter: blur(20px) !important;
    -webkit-backdrop-filter: blur(20px) !important;
    border-radius: 12px !important;
    border: 1px solid rgba(255,255,255,0.1) !important;
    padding: 8px 0 !important;
    min-width: 180px !important;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4) !important;
    z-index: 9999 !important;
}
.menu_dl dd:hover > .sub_menu,
.menu_dl dd:hover > .menu_sub {
    display: block !important;
    animation: fadeDown 0.18s ease !important;
}
@keyframes fadeDown {
    from { opacity:0; transform:translateX(-50%) translateY(-6px); }
    to   { opacity:1; transform:translateX(-50%) translateY(0); }
}
.menu_dl .sub_menu a,
.menu_dl .menu_sub a,
.menu_dl .sub_menu dd a,
.menu_dl .menu_sub dd a {
    display: block !important;
    padding: 8px 18px !important;
    color: rgba(255,255,255,0.7) !important;
    font-size: 12px !important;
    font-weight: 400 !important;
    text-decoration: none !important;
    white-space: nowrap !important;
    transition: color 0.15s, background 0.15s !important;
}
.menu_dl .sub_menu a:hover,
.menu_dl .menu_sub a:hover,
.menu_dl .sub_menu dd:hover a,
.menu_dl .menu_sub dd:hover a {
    color: #fff !important;
    background: rgba(255,255,255,0.06) !important;
}

/* ─── CTA Buttons (DOWNLOADS + CONTACT US) ──────── */
.menu_dl .menu_btn,
.menu_dl dd a.menu_btn,
a.nav_download,
.menu_dl .btn_download,
.menu_dl .btn_contact {
    background: transparent !important;
    color: rgba(255,255,255,0.75) !important;
    border: 1px solid rgba(255,255,255,0.25) !important;
    border-radius: 980px !important;    /* Apple pill shape */
    padding: 6px 14px !important;
    font-size: 12px !important;
    font-weight: 400 !important;
    height: auto !important;
    line-height: 1 !important;
    margin-left: 6px !important;
    text-decoration: none !important;
    display: inline-flex !important;
    align-items: center !important;
    transition: background 0.2s, color 0.2s, border-color 0.2s !important;
    white-space: nowrap !important;
}
.menu_dl .menu_btn:hover {
    background: rgba(255,255,255,0.1) !important;
    color: #fff !important;
    border-color: rgba(255,255,255,0.4) !important;
}
/* CONTACT US — 蓝色 pill */
.menu_dl dd:last-child > a,
a[href*="contact"] .menu_tt,
.menu_dl dd:last-child .menu_tt {
    background: #0071e3 !important;
    color: #fff !important;
    border-radius: 980px !important;
    padding: 7px 16px !important;
    height: auto !important;
    border-bottom: none !important;
    font-size: 12px !important;
    margin-left: 8px !important;
}
.menu_dl dd:last-child .menu_tt:hover {
    background: #0077ed !important;
}

/* ─── Scroll: fully opaque after scroll ─────────── */
.header_b.scrolled {
    background: rgba(18,18,18,0.98) !important;
}

/* ─── Mobile hamburger ──────────────────────────── */
.menu_btn_mb,
.header_mobile { display: none !important; }

@media (max-width: 1024px) {
    .menu_dl .menu_tt { padding: 0 8px !important; font-size: 11px !important; }
}
@media (max-width: 900px) {
    .header_b { height: 48px !important; }
    .menu_dl { display: none !important; }
    .logo img { height: 26px !important; }
}