/* ========================================
   响应式头部导航组件样式
   ======================================== */

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #fff 0%, #f8f9fa 100%);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(3, 144, 217, 0.1);
}

.navbar .container {
    height: 60px;
}

.navbar-brand img {
    max-height: 45px;
    width: auto;
    transition: transform 0.3s ease;
}

.navbar-brand:hover img {
    transform: scale(1.02);
}

/* PC端导航菜单项样式 */
.nav-menu {
    gap: 8px;
}

.nav-menu li a {
    position: relative;
    padding: 8px 14px;
    color: #444;
    font-size: 14px;
    font-weight: 600;
    border-radius: 6px;
    transition: all 0.25s ease;
    overflow: hidden;
}

.nav-menu li a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #0390d9, #00b4d8);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-menu li a:hover {
    color: #0390d9;
    background: rgba(3, 144, 217, 0.06);
    text-decoration: none;
}

.nav-menu li a:hover::before {
    width: 60%;
}

.nav-menu li a.active {
    color: #fff;
    background: linear-gradient(135deg, #0390d9 0%, #0277b6 100%);
    box-shadow: 0 2px 8px rgba(3, 144, 217, 0.3);
}

.nav-menu li a.active::before {
    display: none;
}

/* 汉堡菜单按钮美化 */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: linear-gradient(135deg, #0390d9 0%, #0277b6 100%);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    z-index: 1001;
    box-shadow: 0 2px 8px rgba(3, 144, 217, 0.25);
    transition: all 0.3s ease;
}

.menu-toggle:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(3, 144, 217, 0.35);
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 2px 0;
    background: #fff;
    border-radius: 2px;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

/* 汉堡菜单动画 */
.menu-toggle.active {
    background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.35);
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(6px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-6px) rotate(-45deg);
}

/* 遮罩层 */
.nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 998;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.nav-overlay.active {
    display: block;
    opacity: 1;
}

/* 移动端导航样式 */
@media screen and (max-width: 991px) {
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 15px;
        background: linear-gradient(180deg, #fff 0%, #f8f9fa 100%);
        transform: translateX(-100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-menu li {
        margin: 0;
        padding: 0;
    }
    
    .nav-menu li a {
        display: flex;
        align-items: center;
        padding: 14px 18px;
        margin: 2px 0;
        font-size: 15px;
        border-radius: 10px;
        border-bottom: none;
        background: #fff;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }
    
    .nav-menu li a::before {
        display: none;
    }
    
    .nav-menu li a:hover {
        background: rgba(3, 144, 217, 0.08);
        transform: translateX(5px);
    }
    
    .nav-menu li a.active {
        background: linear-gradient(135deg, #0390d9 0%, #0277b6 100%);
        color: #fff;
        box-shadow: 0 3px 10px rgba(3, 144, 217, 0.3);
    }
}