/* 导航栏相关样式 */

.navbar {
    background: var(--bg-glass-strong);
    backdrop-filter: var(--glass-backdrop-strong);
    -webkit-backdrop-filter: var(--glass-backdrop-strong);
    border-radius: 16px;
    padding: 15px 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
    border: var(--glass-border-strong);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--glass-highlight-strong);
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.navbar:hover {
    box-shadow: var(--shadow-xl);
}

.navbar:hover::before {
    opacity: 1;
}

.nav-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: 12px;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    position: relative;
    overflow: hidden;
    transform-origin: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--glass-highlight-light);
    border-radius: inherit;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}



.nav-btn:hover {
    background: var(--bg-glass);
    color: var(--accent-color);
    backdrop-filter: var(--glass-backdrop-light);
    -webkit-backdrop-filter: var(--glass-backdrop-light);
    transform: translateY(-1px);
}

.nav-btn:hover::before {
    opacity: 0.6;
}

.nav-btn.active {
    background: var(--accent-color);
    color: var(--text-inverse);
    box-shadow: var(--shadow-colored);
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
}

.nav-btn.active::before {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2) 0%, rgba(255, 255, 255, 0.1) 100%);
    opacity: 0.8;
}

/* 导航按钮点击反馈效果 */
.nav-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-btn.clicked {
    animation: nav-btn-click 0.3s ease-out;
}

@keyframes nav-btn-click {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(0.95);
    }
    100% {
        transform: scale(1);
    }
}

.nav-btn i {
    font-size: 16px;
}

.nav-btn span {
    /* styling for navigation button text */
}

/* 聚焦状态 - 修复点击后变白的问题 */
.nav-btn:focus {
    outline: none;
}

.nav-btn:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* 为激活状态的按钮设置正确的焦点样式 */
.nav-btn.active:focus {
    background: var(--accent-color);
    color: var(--text-inverse);
}

/* 非激活状态按钮的焦点样式 */
.nav-btn:not(.active):focus {
    background: var(--bg-glass);
    color: var(--accent-color);
}



/* 响应式导航 - 优化毛玻璃效果 */
@media (max-width: 768px) {
    .nav-buttons {
        justify-content: center;
    }
    
    .nav-btn span {
        display: none;
    }
    
    .nav-btn {
        padding: 12px;
        min-width: 44px;
        justify-content: center;
    }
    
    /* 移动设备上减少毛玻璃效果强度以提升性能 */
    .navbar {
        backdrop-filter: var(--glass-backdrop-light);
        -webkit-backdrop-filter: var(--glass-backdrop-light);
    }
    
    .nav-btn:hover {
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }
}

@media (max-width: 480px) {
    .nav-btn {
        padding: 10px 12px;
        min-width: 50px;
    }
}