/* ============================================
   顶部导航栏组件样式
   简约大气商务版（增强兼容 & 交互优化）
   ============================================ */

/* ===== 导航栏容器 ===== */
.premium-navbar {
    height: 100px;
    min-height: 100px;
    max-height: 100px;
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

/* ✅ 滚动时增强阴影（配合 JS 添加 .scrolled 类） */
.premium-navbar.scrolled {
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
}

/* ===== LOGO ===== */
.premium-navbar .navbar-brand {
    font-weight: 800;
    color: #fff !important;
    font-size: 1.6rem;
    letter-spacing: 2px;
    text-decoration: none;
    white-space: nowrap;
    padding: 0;
    flex-shrink: 0;
    /* ✅ 防止 Logo 文字在窄屏溢出 */
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 280px;
}

.premium-navbar .navbar-brand img {
    height: 60px;
    width: auto;
    max-width: 200px; /* ✅ 限制最大宽度防止超宽 Logo 撑破布局 */
    margin-right: 14px;
    object-fit: contain;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

/* ===== 导航链接 ===== */
.premium-navbar .nav-link {
    color: rgba(255, 255, 255, 0.88) !important;
    font-weight: 500;
    font-size: 1.1rem;
    padding: 12px 22px !important;
    margin: 0 6px;
    border-radius: 8px;
    transition: all 0.25s ease;
    white-space: nowrap;
    letter-spacing: 0.5px;
    position: relative;
}

.premium-navbar .nav-link:hover,
.premium-navbar .nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: #ffffff !important;
    transform: translateY(-1px);
}

/* ✅ 键盘焦点可见性（无障碍） */
.premium-navbar .nav-link:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 2px;
    background: rgba(255, 255, 255, 0.15);
}

/* ===== 导航栏布局：LOGO + 居中菜单 + 搜索 ===== */
.premium-navbar .navbar-nav {
    margin: 0 auto;
    /* ✅ 防止菜单过多时挤压搜索框 */
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none; /* Firefox 隐藏滚动条 */
}
.premium-navbar .navbar-nav::-webkit-scrollbar {
    display: none; /* Chrome/Safari 隐藏滚动条 */
}

/* ===== 移动端汉堡按钮 ===== */
.premium-navbar .navbar-toggler {
    border: 1px solid rgba(255, 255, 255, 0.35);
    padding: 8px 12px;
    border-radius: 8px;
    transition: all 0.2s ease;
}
.premium-navbar .navbar-toggler:hover {
    background: rgba(255, 255, 255, 0.1);
}
.premium-navbar .navbar-toggler:focus {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.25);
}
.premium-navbar .navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,1)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* ===== 搜索框样式 ===== */
.navbar-search {
    position: relative;
    margin-left: 16px;
    flex-shrink: 0;
}

.navbar-search .search-input {
    width: 200px;
    padding: 8px 36px 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    outline: none;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    /* ✅ 修复 Safari 下 placeholder 颜色异常 */
    -webkit-text-fill-color: #ffffff;
}

.navbar-search .search-input::placeholder {
    color: rgba(255, 255, 255, 0.6);
    /* ✅ 兼容各浏览器 placeholder 样式 */
    opacity: 1;
}
/* Firefox */
.navbar-search .search-input::-moz-placeholder {
    color: rgba(255, 255, 255, 0.6);
    opacity: 1;
}
/* Safari/Chrome */
.navbar-search .search-input::-webkit-input-placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.navbar-search .search-input:focus {
    width: 260px;
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

/* ✅ 搜索框键盘焦点 */
.navbar-search .search-input:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 1px;
}

.navbar-search .search-btn {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.6);
    padding: 4px 8px;
    cursor: pointer;
    transition: color 0.2s;
    font-size: 1rem;
    border-radius: 4px;
}
.navbar-search .search-btn:hover {
    color: #ffffff;
}
.navbar-search .search-btn:focus-visible {
    outline: 2px solid rgba(255, 255, 255, 0.8);
    outline-offset: 1px;
}

/* ===== 搜索结果下拉 ===== */
.navbar-search .search-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    left: auto;
    background: #ffffff;
    border-radius: 10px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    max-height: 320px;
    overflow-y: auto;
    display: none;
    z-index: 1000;
    min-width: 280px;
    max-width: 400px; /* ✅ 限制最大宽度防止超宽 */
    padding: 6px 0;
    /* ✅ 防止下拉被导航栏 overflow 裁切 */
    will-change: transform, opacity;
}

.navbar-search .search-dropdown.show {
    display: block;
    animation: fadeInDown 0.2s ease;
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ✅ 减少动画偏好（无障碍） */
@media (prefers-reduced-motion: reduce) {
    .navbar-search .search-dropdown.show {
        animation: none;
    }
    .premium-navbar .nav-link,
    .navbar-search .search-input,
    .premium-navbar {
        transition-duration: 0.01ms !important;
    }
}

/* 搜索分区标题 */
.search-section-title {
    font-size: 12px;
    color: #999;
    padding: 4px 14px;
    margin: 4px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.navbar-search .search-dropdown .search-result-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    text-decoration: none;
    color: #1a2332;
    transition: background 0.15s;
    cursor: pointer;
    border-bottom: 1px solid #f1f4f8;
    font-size: 0.88rem;
    gap: 8px;
}
.navbar-search .search-dropdown .search-result-item:last-child {
    border-bottom: none;
}
.navbar-search .search-dropdown .search-result-item:hover,
.navbar-search .search-dropdown .search-result-item.active { /* ✅ 键盘导航高亮 */
    background: #f5f8ff;
}
.navbar-search .search-dropdown .search-result-item .result-name {
    font-weight: 500;
    color: #1a2332;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
    min-width: 0; /* ✅ 允许 flex 子项收缩以显示省略号 */
}
/* ✅ 搜索高亮标记样式 */
.navbar-search .search-dropdown .search-result-item mark {
    background: #fff3cd;
    color: #856404;
    padding: 0 2px;
    border-radius: 2px;
}

.navbar-search .search-dropdown .search-result-item .result-category {
    font-size: 0.7rem;
    color: #8c9aaa;
    background: #f1f4f8;
    padding: 1px 10px;
    border-radius: 12px;
    flex-shrink: 0;
    white-space: nowrap;
}

/* 百度搜索单独样式 */
.baidu-search-item {
    color: #0066ff !important;
}
.baidu-search-item i {
    margin-right: 6px;
}

.navbar-search .search-dropdown .search-empty,
.navbar-search .search-dropdown .search-loading,
.navbar-search .search-dropdown .search-more {
    padding: 16px 14px;
    text-align: center;
    color: #8c9aaa;
    font-size: 0.85rem;
}

/* ===== 搜索下拉滚动条 ===== */
.navbar-search .search-dropdown::-webkit-scrollbar {
    width: 4px;
}
.navbar-search .search-dropdown::-webkit-scrollbar-track {
    background: transparent;
}
.navbar-search .search-dropdown::-webkit-scrollbar-thumb {
    background: #d0d8e0;
    border-radius: 4px;
}
/* ✅ Firefox 滚动条 */
.navbar-search .search-dropdown {
    scrollbar-width: thin;
    scrollbar-color: #d0d8e0 transparent;
}

/* ============================================
   响应式适配
   ============================================ */

/* ✅ 中等屏幕：菜单过多时自动缩小间距 */
@media (max-width: 1199.98px) and (min-width: 992px) {
    .premium-navbar .nav-link {
        padding: 10px 16px !important;
        font-size: 1rem;
        margin: 0 3px;
    }
    .navbar-search .search-input {
        width: 180px;
    }
    .navbar-search .search-input:focus {
        width: 220px;
    }
}

/* 平板及以下 */
@media (max-width: 991.98px) {
    .premium-navbar {
        height: auto;
        min-height: 80px;
        max-height: none;
        padding: 14px 0;
    }
    .premium-navbar .navbar-brand {
        max-width: 200px;
    }
    .premium-navbar .navbar-brand img {
        height: 50px;
        margin-right: 10px;
    }
    .premium-navbar .navbar-collapse {
        background: rgba(22, 50, 114, 0.97);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        border-radius: 12px;
        margin-top: 12px;
        padding: 14px;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    }
    .premium-navbar .nav-link {
        margin: 4px 0;
        padding: 12px 18px !important;
        border-radius: 8px;
        font-size: 1.05rem;
    }
    .premium-navbar .navbar-nav {
        margin: 0;
        width: 100%;
        overflow-x: visible; /* ✅ 移动端不需要横向滚动 */
    }
    .navbar-search {
        margin: 8px 0 4px 0;
        width: 100%;
    }
    .navbar-search .search-input {
        width: 100% !important; /* ✅ 强制覆盖 focus 时的宽度变化 */
        padding: 10px 40px 10px 16px;
    }
    .navbar-search .search-dropdown {
        position: static;
        margin-top: 4px;
        min-width: unset;
        max-width: unset;
        box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    }
    .navbar-search .search-dropdown .search-result-item {
        padding: 10px 14px;
    }
}

/* 手机 */
@media (max-width: 576px) {
    .premium-navbar .navbar-brand {
        font-size: 1.2rem;
        max-width: 160px;
    }
    .premium-navbar .navbar-brand img {
        height: 40px;
    }
    .premium-navbar .navbar-collapse {
        padding: 10px;
        margin-top: 8px;
    }
}