/* ===================== 导航栏样式（5种，后台可选） ===================== */

/* —— 样式2：居中 Logo（Logo居中，菜单左右分布）—— */
.nav-center .header-bar { position: relative; justify-content: center; }
.nav-center .brand {
    position: absolute; left: 50%; transform: translateX(-50%);
    order: 2;
}
.nav-center .main-nav {
    flex: none; order: 1; justify-content: flex-start;
    position: absolute; left: 0;
}
.nav-center .header-right { order: 3; position: absolute; right: 0; }
@media (max-width: 900px){
    .nav-center .brand { position: static; transform: none; }
    .nav-center .main-nav { position: static; }
}

/* —— 样式3：深色导航（深色背景 + 白字）—— */
.nav-dark.site-header {
    background: #0b1f3a;
    border-bottom: 1px solid rgba(255,255,255,.08);
    backdrop-filter: none;
}
.nav-dark .brand { color: #fff; }
.nav-dark .brand:hover { color: #fff; }
.nav-dark .main-nav a { color: rgba(255,255,255,.78); }
.nav-dark .main-nav a:hover, .nav-dark .main-nav a.active {
    background: rgba(255,255,255,.1); color: #fff;
}
.nav-dark .lang-switch summary { color: rgba(255,255,255,.85); }
.nav-dark .btn-quote {
    background: var(--c-accent, #ff8c42); color: #fff;
}

/* —— 样式4：透明悬浮（透明叠 Hero 上，滚动变白）—— */
.nav-transparent.site-header {
    background: transparent;
    border-bottom: 1px solid rgba(255,255,255,.15);
    backdrop-filter: none;
    transition: all .3s ease;
}
.nav-transparent .brand { color: #fff; }
.nav-transparent .brand:hover { color: #fff; }
.nav-transparent .main-nav a { color: rgba(255,255,255,.85); }
.nav-transparent .main-nav a:hover, .nav-transparent .main-nav a.active {
    background: rgba(255,255,255,.15); color: #fff;
}
.nav-transparent .lang-switch summary { color: #fff; }
.nav-transparent .btn-quote { background: #fff; color: #0b1f3a; }
/* 滚动后变实色（JS 加 .nav-scrolled） */
.nav-transparent.nav-scrolled {
    background: rgba(255,255,255,.97);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--c-border);
}
.nav-transparent.nav-scrolled .brand { color: var(--c-text); }
.nav-transparent.nav-scrolled .main-nav a { color: var(--c-text-muted); }
.nav-transparent.nav-scrolled .main-nav a:hover,
.nav-transparent.nav-scrolled .main-nav a.active {
    background: var(--c-primary-light); color: var(--c-primary);
}
.nav-transparent.nav-scrolled .lang-switch summary { color: var(--c-text); }
.nav-transparent.nav-scrolled .btn-quote {
    background: var(--c-primary); color: #fff;
}

/* —— 样式5：简约（大留白 + 细线 + 字母间距）—— */
.nav-minimal.site-header {
    background: #fff;
    border-bottom: 1px solid #f0f0f0;
    backdrop-filter: none;
}
.nav-minimal .header-bar { height: 84px; gap: 48px; }
.nav-minimal .brand { font-weight: 700; letter-spacing: .5px; }
.nav-minimal .brand .logo-icon { background: #0b1f3a; box-shadow: none; }
.nav-minimal .main-nav { gap: 12px; justify-content: center; }
.nav-minimal .main-nav a {
    color: #1a1a1a; font-size: 14px; font-weight: 500;
    letter-spacing: .8px; text-transform: uppercase;
    border-radius: 0; padding: 6px 4px;
    border-bottom: 2px solid transparent;
}
.nav-minimal .main-nav a:hover, .nav-minimal .main-nav a.active {
    background: transparent; color: #0b1f3a;
    border-bottom-color: #0b1f3a;
}
.nav-minimal .btn-quote {
    background: transparent; color: #0b1f3a;
    border: 1px solid #0b1f3a; border-radius: 0;
    text-transform: uppercase; letter-spacing: .8px; font-size: 13px;
}
.nav-minimal .btn-quote:hover { background: #0b1f3a; color: #fff; }

/* ===================== 用户自定义配色覆盖（优先级最高） ===================== */
.site-header[style*="--nav-bg"] { background: var(--nav-bg) !important; }
.site-header[style*="--nav-text"] .brand,
.site-header[style*="--nav-text"] .main-nav a,
.site-header[style*="--nav-text"] .lang-switch summary { color: var(--nav-text) !important; }
.site-header[style*="--nav-hover-bg"] .main-nav a:hover,
.site-header[style*="--nav-hover-bg"] .main-nav a.active { background: var(--nav-hover-bg) !important; }
.site-header[style*="--nav-btn-bg"] .btn-quote { background: var(--nav-btn-bg) !important; border-color: var(--nav-btn-bg) !important; }
/* 透明样式：仅滚动后应用自定义背景 */
.nav-transparent.site-header[style*="--nav-bg"] { background: transparent !important; }
.nav-transparent.nav-scrolled.site-header[style*="--nav-bg"] { background: var(--nav-bg) !important; }