/* 顶部导航栏样式 */
.top-nav {
    position: fixed;
    top: -80px;
    left: 0;
    right: 0;
    height: 70px;
    background: var(--btn-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 2px solid var(--card-border);
    box-shadow: 0 4px 20px var(--shadow-accent);
    z-index: 1000;
    transition: top 0.45s cubic-bezier(0.16, 1, 0.3, 1), 
                opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
}

.top-nav.visible {
    top: 0;
    opacity: 1;
}

.top-nav-content {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    padding: 0 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 20px;
    font-weight: 600;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.nav-logo:hover {
    transform: scale(1.08);
}

.nav-avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: 2px solid var(--border-hover);
    box-shadow: 0 4px 15px var(--shadow-accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 20px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
}

.nav-link:hover {
    background: var(--btn-bg);
    color: var(--text-primary);
    transform: translateY(-3px) scale(1.05);
}

.nav-link.active {
    background: var(--btn-bg-hover);
    color: var(--text-primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #06b6d4, transparent);
}

/* 下拉菜单 */
.nav-dropdown {
    position: relative;
}

.dropdown-btn {
    background: none;
    border: none;
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    background: var(--card-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border: 2px solid var(--card-border);
    border-radius: 12px;
    padding: 8px;
    min-width: 150px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.nav-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 15px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    font-size: 14px;
}

.dropdown-item:hover {
    background: var(--btn-bg-hover);
    transform: translateX(8px) scale(1.02);
}

/* 主内容区域 */
.main-content {
    transition: padding-top 0.45s cubic-bezier(0.16, 1, 0.3, 1);
    min-height: 100vh;
}

.main-content.with-nav {
    padding-top: 70px;
}

/* 页面视图容器 */
.page-view {
    display: none !important;
    opacity: 0;
    min-height: 100vh;
}

.page-view.active {
    display: block !important;
    opacity: 1;
}

/* 首页内容居中 */
#homePage {
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

#homePage.active {
    display: flex !important;
}

/* 其他页面容器样式 */
#projectsPage,
#techStackPage,
#careerPage,
#aboutPage {
    padding: 0;
    width: 100%;
}

/* 确保页面内容容器有正确的布局 */
.projects-content,
.tech-content,
.career-content,
.about-content {
    position: relative;
    z-index: 2;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

/* 移动端页面内容容器优化 */
@media (max-width: 768px) {
    .projects-content,
    .tech-content,
    .career-content,
    .about-content {
        width: 100%;
        padding: 30px 15px;
    }
}

@media (max-width: 480px) {
    .projects-content,
    .tech-content,
    .career-content,
    .about-content {
        padding: 25px 12px;
    }
}

/* 页面切换动画 */
.page-exit {
    animation: pageSlideOut 0.28s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.page-enter {
    animation: pageSlideIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes pageSlideOut {
    0% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 0;
        transform: translateY(-20px) scale(0.96);
    }
}

@keyframes pageSlideIn {
    0% {
        opacity: 0;
        transform: translateY(25px) scale(0.96);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* 响应式 */
@media (max-width: 1024px) {
    .top-nav-content {
        padding: 0 20px;
    }
    
    .nav-links {
        gap: 6px;
    }
    
    .nav-link {
        padding: 8px 15px;
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .top-nav {
        height: auto;
        min-height: 60px;
    }
    
    .top-nav-content {
        padding: 10px 15px;
        flex-wrap: wrap;
        gap: 10px;
    }
    
    .nav-links {
        width: 100%;
        flex-wrap: wrap;
        justify-content: center;
        gap: 6px;
    }
    
    .nav-link {
        padding: 6px 12px;
        font-size: 13px;
    }
    
    .nav-logo {
        font-size: 16px;
    }
    
    .nav-avatar {
        width: 35px;
        height: 35px;
    }
    
    .dropdown-menu {
        right: auto;
        left: 50%;
        transform: translateX(-50%) translateY(-10px);
    }
    
    .nav-dropdown:hover .dropdown-menu {
        transform: translateX(-50%) translateY(0);
    }
    
    .theme-toggle {
        order: 1;
    }
}

@media (max-width: 480px) {
    .top-nav-content {
        padding: 8px 10px;
    }
    
    .nav-logo {
        font-size: 14px;
        gap: 8px;
    }
    
    .nav-logo span {
        display: none;
    }
    
    .nav-avatar {
        width: 32px;
        height: 32px;
    }
    
    .nav-links {
        gap: 4px;
    }
    
    .nav-link {
        padding: 5px 10px;
        font-size: 12px;
    }
    
    .dropdown-item {
        padding: 8px 12px;
        font-size: 13px;
    }
    
    .theme-toggle {
        width: 35px;
        height: 35px;
    }
    
    .theme-icon {
        font-size: 16px;
    }
}

@media (max-width: 360px) {
    .nav-link {
        padding: 4px 8px;
        font-size: 11px;
    }
}