/* 全局变量 */
:root {
    --primary-color: #000000;
    --secondary-color: #2d76ee;
    --accent-color: #00bcd4;
    --text-color: #111111;
    --text-light: #777777;
    --background-color: #ffffff;
    --background-light: #f7f9fc;
    --border-color: #eeeeee;
    
    --grid-unit: 8px;
    --spacing-xs: calc(var(--grid-unit) * 1);
    --spacing-sm: calc(var(--grid-unit) * 2);
    --spacing-md: calc(var(--grid-unit) * 3);
    --spacing-lg: calc(var(--grid-unit) * 6);
    --spacing-xl: calc(var(--grid-unit) * 10);
    
    --transition-fast: 0.2s;
    --transition-medium: 0.3s;
    --transition-slow: 0.5s;
    
    --font-sans: 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'Roboto Mono', monospace;
    
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 1px 3px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 20px rgba(0,0,0,0.05), 0 6px 6px rgba(0,0,0,0.06);
}

/* 顶部信息栏样式 */
.top-bar {
    background-color: #1e3d59;
    color: #fff;
    font-size: 14px;
    padding: 8px 0;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.top-bar-item {
    color: #fff;
    text-decoration: none;
    margin-right: 20px;
    transition: color 0.3s ease;
}

.top-bar-item:hover {
    color: #f5f0e1;
}

.top-bar-item i {
    margin-right: 5px;
}

/* 主导航栏样式 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 9999;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform var(--transition-medium) cubic-bezier(0.4, 0, 0.2, 1), 
                background-color var(--transition-medium) ease;
    box-shadow: var(--shadow-sm);
}

body {
    padding-top: 80px; /* 减小头部填充空间 */
}

/* 针对首页特别处理 */
body.home {
    padding-top: 0; /* 首页不需要顶部填充 */
}

.admin-bar .site-header {
    top: 32px; /* 为WordPress管理员工具栏留出空间 */
}

@media screen and (max-width: 782px) {
    .admin-bar .site-header {
        top: 46px;
    }
}

.site-header.header-hidden {
    transform: translateY(-100%);
}

.site-header.header-scrolled {
    box-shadow: var(--shadow-md);
}

.header-wrapper {
    padding: var(--spacing-md) 0;
    transition: padding var(--transition-medium) ease;
}

.site-header.header-scrolled .header-wrapper {
    padding: var(--spacing-sm) 0;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.header-grid {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: var(--spacing-lg);
}

/* Logo样式 */
.site-branding {
    display: flex;
    align-items: center;
}

.site-branding img {
    max-height: 60px;
    width: auto;
}

.site-title {
    margin: 0;
    font-family: var(--font-sans);
    font-weight: 700;
    line-height: 1;
    display: flex;
    flex-direction: column;
}

.site-title a {
    color: var(--primary-color);
    text-decoration: none;
    display: block;
}

.title-part {
    display: block;
}

.title-main {
    font-size: 22px;
    font-weight: 700;
}

.title-secondary {
    font-size: 20px;
    font-weight: 500;
}

.title-tertiary {
    font-size: 20px;
    font-weight: 400;
    color: var(--secondary-color);
}

.custom-logo {
    max-height: 60px;
    width: auto;
    transition: max-height var(--transition-medium) ease;
}

.header-scrolled .custom-logo {
    max-height: 50px;
}

/* 导航菜单样式 */
.main-navigation {
    justify-self: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-md);
}

.nav-menu li {
    position: relative;
}

.nav-menu a {
    position: relative;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 1rem;
    padding: 0.5rem 1rem;
    transition: color 0.3s ease;
    white-space: nowrap; /* 防止文本换行 */
    height: auto; /* 确保高度自适应内容 */
    line-height: 1.5; /* 确保行高适当 */
    display: inline-block; /* 确保块级显示 */
}

.nav-menu a:before {
    content: "";
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--secondary-color);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.nav-menu a:hover {
    color: var(--secondary-color);
}

.nav-menu a:hover:before {
    transform: scaleX(1);
}

.nav-menu .current-menu-item a {
    color: var(--secondary-color);
    font-weight: 600;
}

.nav-menu .current-menu-item a:before {
    transform: scaleX(1);
    opacity: 1;
}

.nav-menu .current-menu-item a:hover:before {
    /* 防止hover时显示两条线 */
    opacity: 1;
    transform: scaleX(1);
}

/* 子菜单 */
.nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background-color: var(--background-color);
    box-shadow: var(--shadow-md);
    min-width: 200px;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-medium) ease;
    z-index: 1000;
}

.nav-menu .menu-item-has-children:hover > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-menu .sub-menu li {
    margin: 0;
}

.nav-menu .sub-menu a {
    padding: var(--spacing-xs) var(--spacing-sm);
    display: block;
}

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

/* 右侧功能区 */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.search-toggle {
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 18px;
    padding: var(--spacing-xs);
    cursor: pointer;
    transition: color var(--transition-fast) ease;
}

.search-toggle:hover {
    color: var(--secondary-color);
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background-color: var(--secondary-color);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    font-weight: 500;
    font-size: 15px;
    text-decoration: none;
    transition: background-color var(--transition-fast) ease, 
                transform var(--transition-fast) ease;
}

.cta-button:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
    color: white;
}

.cta-icon {
    display: inline-flex;
    align-items: center;
    transition: transform var(--transition-fast) ease;
}

.cta-button:hover .cta-icon {
    transform: translateX(3px);
}

/* 搜索按钮和弹窗样式 */
.search-popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-medium) ease, 
                visibility var(--transition-medium) ease;
}

.search-popup.active {
    opacity: 1;
    visibility: visible;
}

.search-popup-inner {
    width: 100%;
    max-width: 800px;
    padding: var(--spacing-lg);
    position: relative;
    transform: translateY(30px);
    opacity: 0;
    transition: transform var(--transition-medium) cubic-bezier(0.4, 0, 0.2, 1), 
                opacity var(--transition-medium) ease;
    transition-delay: 0.1s;
}

.search-popup.active .search-popup-inner {
    transform: translateY(0);
    opacity: 1;
}

.search-title {
    font-size: 36px;
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
    font-weight: 400;
}

.search-form {
    display: flex;
    gap: var(--spacing-sm);
}

.search-form input[type="search"] {
    flex: 1;
    padding: var(--spacing-md);
    font-size: 18px;
    border: none;
    border-bottom: 2px solid var(--border-color);
    background: transparent;
    transition: border-color var(--transition-fast) ease;
}

.search-form input[type="search"]:focus {
    outline: none;
    border-color: var(--secondary-color);
}

.search-form button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 16px;
    cursor: pointer;
    transition: background-color var(--transition-fast) ease;
}

.search-form button:hover {
    background-color: var(--accent-color);
}

.search-close {
    position: absolute;
    top: 0;
    right: var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 24px;
    cursor: pointer;
    padding: var(--spacing-xs);
    transition: color var(--transition-fast) ease, 
                transform var(--transition-fast) ease;
}

.search-close:hover {
    color: var(--accent-color);
    transform: rotate(90deg);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.menu-toggle-inner {
    display: flex;
    flex-direction: column;
    gap: 6px;
    width: 24px;
    height: 18px;
}

.menu-toggle-line {
    width: 100%;
    height: 2px;
    background-color: var(--text-color);
    transition: transform var(--transition-medium) ease, 
                opacity var(--transition-medium) ease;
}

/* 响应式样式 */
@media (max-width: 1200px) {
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-menu a {
        font-size: 15px;
        padding: var(--spacing-xs) var(--spacing-xs);
    }
    
    .title-main {
        font-size: 20px;
    }
    
    .title-secondary, .title-tertiary {
        font-size: 18px;
    }
}

@media (max-width: 992px) {
    .header-grid {
        grid-template-columns: auto auto;
    }
    
    .main-navigation {
        grid-column: 1 / -1;
        grid-row: 2;
        justify-self: start;
        width: 100%;
        overflow: hidden;
        max-height: 0;
        transition: max-height var(--transition-medium) ease;
    }
    
    .main-navigation.active {
        max-height: 500px;
    }
    
    .nav-menu {
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-md) 0;
    }
    
    .nav-menu a {
        padding: var(--spacing-sm) 0;
        display: block;
    }
    
    .nav-menu a:before {
        left: 0;
        right: 0;
    }
    
    .nav-menu .sub-menu {
        position: static;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transform: none;
        background-color: transparent;
        padding: 0 0 0 var(--spacing-md);
        margin-top: 0;
    }
    
    .menu-toggle {
        display: block;
        order: 1;
    }
    
    .header-actions {
        justify-self: end;
    }
    
    .cta-button {
        padding: var(--spacing-xs) var(--spacing-sm);
        font-size: 14px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .title-main {
        font-size: 18px;
    }
    
    .title-secondary, .title-tertiary {
        font-size: 16px;
    }
    
    .search-title {
        font-size: 28px;
    }
    
    .search-form input[type="search"] {
        padding: var(--spacing-sm);
        font-size: 16px;
    }
}

@media (max-width: 576px) {
    .cta-text {
        display: none;
    }
    
    .cta-button {
        padding: var(--spacing-xs);
        border-radius: 50%;
        width: 36px;
        height: 36px;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    
    .cta-icon {
        margin: 0;
    }
    
    .search-popup-inner {
        padding: var(--spacing-md);
    }
    
    .title-part {
        display: inline;
    }
    
    .title-main::after,
    .title-secondary::after {
        content: " ";
    }
}

/* 确保project内容不会被header遮挡 */
.project-hero, .projects-archive-hero {
    padding-top: 7rem;
}

/* 主页header特殊处理 */
body.home .site-header {
    background-color: rgba(255, 255, 255, 0.9); /* 主页更透明的header */
    box-shadow: none; /* 移除阴影 */
}

body.home .site-header.header-scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
}