/* 彩虹渐变和动画效果 */
 :root {
    --primary-gradient: linear-gradient(135deg, #4e54c8, #8f94fb);
    --rainbow-gradient: linear-gradient(90deg, #ff00cc, #333399, #00ccff);
    --success-gradient: linear-gradient(135deg, #11998e, #38ef7d);
    --danger-gradient: linear-gradient(135deg, #f5576c, #f093fb);
    --info-gradient: linear-gradient(135deg, #0093E9, #80D0C7);
    --warning-gradient: linear-gradient(135deg, #f7971e, #ffd200);
    --secondary-gradient: linear-gradient(135deg, #6a11cb, #2575fc);
}

/* 彩虹导航栏 */
.navbar-rainbow {
    position: relative;
    /* overflow: hidden; */
}

.navbar-rainbow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--rainbow-gradient);
    background-size: 300% 100%;
    animation: gradient-shift 10s ease infinite;
    z-index: 1000;
}

@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 导航项悬停效果 */
.nav-item {
    position: relative;
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--rainbow-gradient);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-item:hover::after {
    width: 80%;
}

/* 导航链接和下拉菜单动画 */
.navbar-nav .nav-link {
    transition: color 0.3s ease, transform 0.2s ease;
}

.navbar-nav .nav-link:hover {
    transform: translateY(-2px);
}

.dropdown-menu {
    border: none;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 0.5rem;
    animation: dropdown-fade 0.3s ease;
    transform-origin: top center;
}

@keyframes dropdown-fade {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.dropdown-item {
    transition: all 0.2s ease;
    padding: 0.5rem 1.5rem;
}

.dropdown-item:hover {
    background-color: rgba(78, 84, 200, 0.1);
    transform: translateX(5px);
}

/* 品牌Logo动画 */
.navbar-brand {
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.logo-text {
    background: var(--rainbow-gradient);
    background-size: 300% 100%;
    animation: gradient-shift 10s ease infinite;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 700;
}

/* 语言切换样式 */
.lang-flag {
    width: 24px;
    height: 18px;
    vertical-align: middle;
    border-radius: 2px;
    border: 1px solid rgba(0,0,0,0.1);
}

/* 自定义语言下拉菜单 */
.custom-lang-dropdown {
    position: relative;
    display: inline-block;
    margin-left: auto;
    z-index: 1100;
}

.custom-lang-dropdown-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 4px;
    border: none;
    background: transparent;
    color: #212529;
    z-index: 1100;
}

.custom-lang-dropdown-toggle:hover {
    background-color: rgba(0,0,0,0.05);
}

.custom-lang-dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    background-color: #fff;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border-radius: 0.5rem;
    padding: 8px 0;
    z-index: 1100;
    animation: dropdown-fade 0.3s ease;
    margin-top: 2px;
    min-width: 160px;
}

.custom-lang-dropdown-content a {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    text-decoration: none;
    color: #212529;
    transition: all 0.2s ease;
}

.custom-lang-dropdown-content a:hover {
    background-color: rgba(78, 84, 200, 0.1);
    transform: translateX(5px);
}

.custom-lang-dropdown-content a .lang-text {
    margin-left: 8px;
}

.custom-lang-dropdown.show .custom-lang-dropdown-content {
    display: block;
}

/* 确保导航栏在内容较长时也能正确显示下拉菜单 */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1050;
}



  /* 渐变按钮效果 */
  .btn-gradient-rainbow {
    background: linear-gradient(90deg, #ff00cc, #333399, #00ccff);
    background-size: 300% 100%;
    color: white;
    border: none;
    transition: all 0.3s ease;
}

.btn-gradient-rainbow:hover {
    background-size: 300% 100%;
    animation: gradient-shift 3s ease infinite;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(255, 0, 204, 0.3);
    color: white;
}

/* 按钮闪光效果 */
.animated-btn {
    position: relative;
    overflow: hidden;
}

.animated-btn::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    bottom: -50%;
    left: -50%;
    background: linear-gradient(to bottom, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.4) 100%);
    transform: rotateZ(60deg) translate(-5em, 7.5em);
    animation: shine 5s infinite;
}

@keyframes shine {
    0% {
        transform: rotateZ(60deg) translate(-5em, 7.5em);
    }
    100% {
        transform: rotateZ(60deg) translate(0, -7.5em);
    }
}

.logo-img{
    width: 25px;
    height: 25px;
    margin-right: 5px;
}