/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* CSS变量定义 - Material Design 3.0 优化 */
:root {
    /* Material Design 主题色彩 */
    --primary-color: #1976d2;
    --primary-color-rgb: 25, 118, 210; /* 添加RGB格式的primary-color变量 */
    --primary-variant: #1565c0;
    --secondary-color: #03dac6;
    --secondary-variant: #018786;
    --accent-color: #ff4081;
    --background-color: #fafafa;
    --surface-color: #ffffff;
    --surface-color-rgb: 255, 255, 255; /* 添加RGB格式的surface-color变量 */
    --surface-variant: #f5f5f5;
    --text-primary: #212121;
    --text-secondary: #757575;
    --text-muted: #9e9e9e;
    --border-color: #e0e0e0;
    
    /* Material Design 阴影系统 */
    --elevation-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --elevation-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
    --elevation-4: 0 14px 28px rgba(0,0,0,0.25), 0 10px 10px rgba(0,0,0,0.22);
    --elevation-5: 0 19px 38px rgba(0,0,0,0.30), 0 15px 12px rgba(0,0,0,0.22);
    
    /* 兼容性阴影变量 */
    --shadow-light: var(--elevation-1);
    --shadow-medium: var(--elevation-2);
    --shadow-large: var(--elevation-3);
    
    /* Material Design 渐变 */
    --gradient-primary: linear-gradient(135deg, #1976d2 0%, #1565c0 100%);
    --gradient-secondary: linear-gradient(135deg, #03dac6 0%, #018786 100%);
    --gradient-accent: linear-gradient(135deg, #ff4081 0%, #e91e63 100%);
    
    /* 页面特定渐变色 - 便于查找和修改 
     * About页面渐变色: --gradient-about (蓝色到青色)
     * Experience页面渐变色: --gradient-experience (绿色渐变)
     * Articles页面渐变色: --gradient-articles (蓝色到青色)
     * Contact页面渐变色: --gradient-contact (蓝色到青色)
     */
    --gradient-about: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --gradient-experience: linear-gradient(135deg, #00E0EE, #AD00FE);
    --gradient-articles: linear-gradient(135deg, #4063BC 0%, #6B0013 100%);
    --gradient-contact: linear-gradient(135deg, #C5EDF5 0%, #4A879A 100%);
    
    /* Avatar 相关变量 */
    --avatar-size: 300px;
    --avatar-size-tablet: 200px;
    --avatar-size-mobile: 150px;
    --avatar-border-width: 3px;
    --avatar-border-color: rgba(255,255,255,0.3);
    --primary-color-dark: #357abd;
}

/* Material Design 暗色主题 */
[data-theme="dark"] {
    --primary-color: #90caf9;
    --primary-variant: #42a5f5;
    --secondary-color: #80cbc4;
    --secondary-variant: #4db6ac;
    --accent-color: #ff80ab;
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --surface-variant: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --text-muted: #808080;
    --border-color: #373737;
    
    /* 暗色主题阴影系统 */
    --elevation-1: 0 1px 3px rgba(0,0,0,0.2), 0 1px 2px rgba(0,0,0,0.14);
    --elevation-2: 0 3px 6px rgba(0,0,0,0.2), 0 3px 6px rgba(0,0,0,0.14);
    --elevation-3: 0 10px 20px rgba(0,0,0,0.2), 0 6px 6px rgba(0,0,0,0.14);
    --elevation-4: 0 14px 28px rgba(0,0,0,0.2), 0 10px 10px rgba(0,0,0,0.14);
    --elevation-5: 0 19px 38px rgba(0,0,0,0.2), 0 15px 12px rgba(0,0,0,0.14);
    
    /* 兼容性阴影变量 */
    --shadow-light: var(--elevation-1);
    --shadow-medium: var(--elevation-2);
    --shadow-large: var(--elevation-3);
    
    /* 暗黑模式下的 Avatar 变量 */
    --avatar-border-color: rgba(255,255,255,0.2);
    --primary-color-dark: #1e40af;
}

/* Material Design 基础样式 */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

/* Material Design 动画关键帧 */
@keyframes materialFadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes materialSlideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes materialPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes materialRipple {
    0% {
        transform: scale(0);
        opacity: 1;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

/* Material Design 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: var(--surface-color);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: none;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--elevation-2);
}

[data-theme="dark"] .navbar {
    background-color: var(--surface-color);
    box-shadow: var(--elevation-2);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-logo h2 {
    color: var(--primary-color);
    font-weight: 700;
    font-size: 1.6rem;
    letter-spacing: -0.025em;
    margin: 0;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    padding: 0.5rem 0;
}

.nav-link:hover {
    color: var(--primary-color);
    transform: translateY(-1px);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    border-radius: 1px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: var(--primary-color);
}

.nav-link.active::after {
    width: 100%;
}

/* 暗黑模式下导航链接样式 */
[data-theme="dark"] .nav-link {
    color: var(--text-primary) !important;
}

[data-theme="dark"] .nav-link:hover {
    color: var(--primary-color) !important;
}

/* 导航右侧控制区域 */
.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

/* Admin Link */
.admin-link {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-size: 0.9rem;
}

.admin-link:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

[data-theme="dark"] .admin-link:hover {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.theme-toggle {
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 10px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

[data-theme="dark"] .theme-toggle:hover {
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.theme-toggle i {
    color: var(--text-secondary);
    font-size: 1.1rem;
    transition: color 0.3s ease;
}

.theme-toggle:hover i {
    color: white;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.5rem;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-toggle:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.bar {
    width: 18px;
    height: 2px;
    background-color: var(--text-secondary);
    margin: 2px 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 1px;
}

.nav-toggle:hover .bar {
    background-color: white;
}

.nav-toggle.active .bar:nth-child(1) {
    transform: rotate(-45deg) translate(-4px, 4px);
}

.nav-toggle.active .bar:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active .bar:nth-child(3) {
    transform: rotate(45deg) translate(-4px, -4px);
}

/* Material Design Hero Section */
.hero {
    padding: 124px 0 80px;
    background: var(--gradient-primary);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.05) 100%);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

/* Material Design 按钮样式 */
.btn {
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 24px;
    font-weight: 500;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    font-size: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
    min-width: 64px;
    height: 48px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: var(--elevation-2);
}

.btn-primary:hover {
    background-color: var(--primary-variant);
    box-shadow: var(--elevation-3);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    color: white;
    border: 2px solid white;
    box-shadow: none;
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.1);
    box-shadow: var(--elevation-1);
    transform: translateY(-1px);
}

.avatar-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.avatar {
    width: var(--avatar-size, 300px);
    height: var(--avatar-size, 300px);
    border-radius: 50%;
    background-image: 
        url('./images/profile/avatar.webp'),
        url('./images/profile/avatar.jpg'),
        linear-gradient(135deg, var(--primary-color) 0%, var(--primary-color-dark, #357abd) 100%);
    background-size: cover, cover, 100% 100%;
    background-position: center;
    background-repeat: no-repeat;
    border: var(--avatar-border-width, 3px) solid var(--avatar-border-color, rgba(255,255,255,0.3));
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.1),
        0 4px 16px rgba(0, 0, 0, 0.05);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.avatar:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 
        0 12px 40px rgba(0, 0, 0, 0.15),
        0 8px 24px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color, rgba(74, 144, 226, 0.6));
}

/* 图片加载状态指示器 */
.avatar::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 24px;
    height: 24px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top: 2px solid rgba(255,255,255,0.8);
    border-radius: 50%;
    animation: avatar-loading 1s linear infinite;
    opacity: 0;
    pointer-events: none;
}

@keyframes avatar-loading {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

/* Section 通用样式 */
.section {
    padding: 80px 0;
}

/* 概要页面特定样式 */
/* Material Design Overview Sections Container */
.overview-sections-container {
    padding: 100px 0 40px;
    background: var(--background-color);
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    align-items: start;
}

/* Material Design 进入动画 */
.overview-card {
    animation: materialFadeIn 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.overview-card:nth-child(1) {
    animation-delay: 0.1s;
}

.overview-card:nth-child(2) {
    animation-delay: 0.2s;
}

.overview-card:nth-child(3) {
    animation-delay: 0.3s;
}

.overview-card:nth-child(4) {
    animation-delay: 0.4s;
}

/* 响应式设计 - 小屏幕单列布局 */
@media (max-width: 768px) {
    .overview-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .overview-sections-container {
        padding: 80px 0 30px;
    }
}

.about-overview,
.experience-overview,
.articles-overview,
.contact-overview {
    padding: 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 600;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* About Section */
.about {
    background-color: var(--surface-color);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-intro {
    font-size: 1.25rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--surface-color);
    border: 4px solid var(--border-color);
    position: relative;
}

.image-placeholder:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease;
}

.profile-image:hover {
    transform: scale(1.1);
}

.detail-item h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.detail-item ul {
    list-style: none;
}

.detail-item li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.detail-item li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--primary-color);
}

.about-vision {
    background-color: var(--background-color);
    padding: 2rem;
    border-radius: 12px;
    border-left: 4px solid var(--primary-color);
}

.about-vision h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
}

.social-link {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}



.project-description {
    margin: 1rem 0;
    color: var(--text-secondary);
    line-height: 1.7;
}

.project-achievements h4 {
    color: var(--text-primary);
    margin: 1.5rem 0 0.5rem;
}

.project-achievements ul {
    list-style: none;
}

.project-achievements li {
    padding: 0.25rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
}

.project-achievements li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.project-tags {
    margin-top: 1rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    background-color: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* Articles Section */
.articles {
    background-color: var(--surface-color);
}

.articles-filter {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.filter-btn {
    padding: 0.5rem 1.5rem;
    border: 2px solid var(--border-color);
    background-color: var(--background-color);
    color: var(--text-secondary);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-btn.active,
.filter-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.article-card, .project-card {
    background-color: var(--background-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-light);
    transition: all 0.3s ease;
}

.article-card:hover, .project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-large);
}

.article-image {
    height: 200px;
    overflow: hidden;
}

.article-placeholder {
    width: 100%;
    height: 100%;
    background: var(--gradient-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.article-placeholder::before {
    content: '📝';
}

.article-content {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.article-date {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.article-category {
    background-color: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.article-title {
    color: var(--text-primary);
    font-size: 1.25rem;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.article-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.article-tags .tag {
    background-color: var(--surface-color);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.read-more:hover {
    gap: 1rem;
}

/* Contact Section */
.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h3 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.contact-info p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: var(--text-secondary);
}

.contact-method i {
    color: var(--primary-color);
    width: 20px;
}

.contact-form {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--background-color);
    color: var(--text-primary);
    transition: border-color 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background-color: var(--text-primary);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: white;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: white;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer-social a:hover {
    background-color: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
}

/* 暗黑模式下的Footer样式 */
[data-theme="dark"] .footer {
    background-color: var(--surface-color);
    color: var(--text-primary);
}

[data-theme="dark"] .footer-section h3,
[data-theme="dark"] .footer-section h4 {
    color: var(--text-primary);
}

[data-theme="dark"] .footer-section p {
    color: var(--text-secondary);
}

[data-theme="dark"] .footer-section ul li a {
    color: var(--text-secondary);
}

[data-theme="dark"] .footer-section ul li a:hover {
    color: var(--text-primary);
}

[data-theme="dark"] .footer-social a {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

[data-theme="dark"] .footer-bottom {
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

/* 暗黑模式下的stat-item样式 */
[data-theme="dark"] .stat-item {
    background: linear-gradient(135deg, rgba(74, 144, 226, 0.15), rgba(74, 144, 226, 0.08));
    border-color: rgba(74, 144, 226, 0.3);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] .stat-item:hover {
    box-shadow: 0 4px 12px rgba(74, 144, 226, 0.25);
    border-color: var(--primary-color);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        height: 64px;
        padding: 0 1.5rem;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 64px;
        flex-direction: column;
        background-color: var(--background-color);
        width: 100%;
        text-align: center;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        padding: 2rem 0;
        border-top: 1px solid var(--border-color);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
    }

    [data-theme="dark"] .nav-menu {
        background-color: rgba(15, 23, 42, 0.95);
        box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 10px 10px -5px rgba(0, 0, 0, 0.2);
        border-top: 1px solid rgba(51, 65, 85, 0.8);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 0.75rem 0;
    }

    .nav-link {
        font-size: 1.1rem;
        padding: 0.75rem 1rem;
        border-radius: 8px;
        margin: 0 1rem;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        color: var(--text-primary);
    }

    .nav-link:hover {
        background-color: var(--surface-color);
        transform: none;
        color: var(--primary-color);
    }

    [data-theme="dark"] .nav-link {
        color: var(--text-primary);
    }

    [data-theme="dark"] .nav-link:hover {
        color: var(--primary-color);
        background-color: var(--surface-color);
    }

    .nav-link::after {
        display: none;
    }

    .nav-controls {
        gap: 0.5rem;
    }

    .nav-toggle {
        display: flex;
    }

    .admin-link,
    .theme-toggle {
        width: 36px;
        height: 36px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }

    .hero-title {
        font-size: 2.5rem;
        white-space: normal;
        overflow: visible;
        text-overflow: unset;
    }

    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }

    .avatar {
        --avatar-size: var(--avatar-size-tablet);
        --avatar-border-width: 2px;
    }

    .about-details {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .timeline {
        padding-left: 0;
    }

    .timeline::before {
        left: 15px;
    }

    .timeline-item {
        padding-left: 50px;
    }

    .timeline-marker {
        left: 5px;
    }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .container {
        padding: 0 1rem;
    }

    .section {
        padding: 60px 0;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 104px 0 60px;
    }

    .hero-title {
        font-size: 1.8rem;
        white-space: normal;
        overflow: visible;
        text-overflow: unset;
        line-height: 1.3;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .avatar {
        --avatar-size: var(--avatar-size-mobile);
        --avatar-border-width: 2px;
    }

    .nav-container {
        padding: 0 1rem;
    }

    .articles-filter {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.4rem 1rem;
        font-size: 0.9rem;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* 选择文本样式 */
::selection {
    background-color: var(--primary-color);
    color: white;
}

/* Material Design 焦点和无障碍样式 */
:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* 改进的焦点状态 */
.btn:focus-visible,
.nav-link:focus-visible,
.overview-link:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px rgba(25, 118, 210, 0.2);
}

/* 减少动画的用户偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
        --text-secondary: #000000;
    }
    
    [data-theme="dark"] {
        --border-color: #ffffff;
        --text-secondary: #ffffff;
    }
}

/* 加载动画 */
.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.loading.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* About Page Styles */
/* 使用 --gradient-about 变量定义渐变背景 */
.about-hero {
    background: var(--gradient-about);
    color: white;
    padding: 120px 0 80px;
    text-align: left;
}

.about-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.about-subtitle {
    font-size: 2rem;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 0 2rem;
    line-height: 1.4;
    font-weight: 500;
    letter-spacing: 0.01em;
}

.about-hero-content {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.about-text {
    flex: 1;
    text-align: left;
}

.about-image {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 媒体查询：在小屏幕上将左右布局改为上下布局 */
@media (max-width: 768px) {
    .about-hero-content {
        flex-direction: column;
        gap: 3rem;
    }
    
    .about-text, .about-image {
        flex: none;
        width: 100%;
    }
    
    .about-hero {
        text-align: center;
    }
    
    .about-text {
        text-align: center;
    }
}

.about-description {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-top: 1rem;
    margin-bottom: 2rem;
    opacity: 0.85;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-align: justify;
    letter-spacing: 0.02em;
    word-spacing: 0.1em;
    padding: 0 1rem;
    font-weight: 400;
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.expertise-item {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.expertise-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.expertise-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.expertise-icon i {
    font-size: 1.5rem;
    color: white;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.skill-category {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.skill-category h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: var(--primary-color);
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

.values-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.value-item {
    text-align: center;
    padding: 2rem;
}

.value-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.value-icon i {
    font-size: 2rem;
    color: white;
}

/* Experience Page Styles */
/* 使用 --gradient-experience 变量定义渐变背景 */
.experience-hero {
    background: var(--gradient-experience);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

/* Timeline Layout */
.timeline-section {
    padding: 80px 0;
}

.timeline {
    position: relative;
    max-width: 1600px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    gap: 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 79px;
    top: 2rem;
    bottom: 2rem;
    width: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
    z-index: 1;
}

.timeline-markers {
    width: 160px;
    flex-shrink: 0;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
}

.timeline-content-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

.timeline-item {
    position: relative;
    width: 100%;
}

.timeline-marker {
    position: absolute;
    left: 70px;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    border: 3px solid var(--bg-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    z-index: 3;
}

.timeline-marker::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 4px;
    height: 4px;
    background: var(--bg-primary);
    border-radius: 50%;
    z-index: 4;
}

.timeline-marker:nth-child(1) {
    top: 150px;
}

.timeline-marker:nth-child(2) {
    top: 550px;
}

.timeline-marker:nth-child(3) {
    top: 950px;
}

.timeline-content {
        background: var(--surface-color);
        padding: 2.5rem;
        border-radius: 24px; /* Material Design 3.0 更大的圆角 */
        border: none; /* 移除边框，使用阴影代替 */
        position: relative;
        box-shadow: var(--elevation-2);
        transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); /* Material Design的标准过渡曲线 */
        overflow: hidden;
        width: 100%;
        max-width: 1800px;
    }

.timeline-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1); /* 统一过渡时间 */
    opacity: 0.9; /* 轻微降低不透明度 */
}

.timeline-content:hover::before {
    transform: scaleX(1);
}

.timeline-content:active {
    transform: translateY(-2px); /* 点击时轻微上移 */
    box-shadow: var(--elevation-2); /* 点击时减小阴影 */
}



.timeline-content:hover {
    transform: translateY(-4px); /* 减小上移距离，更符合Material Design的微妙动效 */
    box-shadow: var(--elevation-3); /* 使用适中的阴影层级 */
    background-color: rgba(var(--surface-color-rgb), 0.98); /* 轻微改变背景色 */
}



.project-header {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.project-icon {
    width: 56px; /* Material Design推荐的图标尺寸 */
    height: 56px;
    background: var(--gradient-primary);
    border-radius: 16px; /* 更大的圆角 */
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--elevation-1);
    transition: transform 0.2s ease, box-shadow 0.2s ease; /* 添加过渡效果 */
}

.project-icon:hover {
    transform: scale(1.05); /* 轻微放大效果 */
    box-shadow: var(--elevation-2);
}

.project-icon i {
    font-size: 1.5rem;
    color: white;
}

.project-meta {
    flex: 1;
}

.project-title {
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: 500; /* Material Design推荐使用500作为标题权重 */
    margin: 0 0 0.5rem 0;
    line-height: 1.3;
    letter-spacing: -0.01em; /* 轻微的字母间距调整 */
}

.project-period {
    color: var(--primary-color); /* 使用主色调 */
    font-size: 0.85rem;
    font-weight: 500;
    background: rgba(var(--primary-color-rgb, 25, 118, 210), 0.08); /* 半透明背景 */
    padding: 0.25rem 0.75rem;
    border-radius: 16px; /* Material Design 3.0的芯片圆角 */
    display: inline-flex;
    align-items: center;
    border: 1px solid rgba(var(--primary-color-rgb, 25, 118, 210), 0.12); /* 添加细微边框 */
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.project-period::before {
    content: '\f017'; /* 时钟图标 */
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    margin-right: 0.5rem;
    font-size: 0.8rem;
    opacity: 0.8;
}

.project-period:hover {
    background: rgba(var(--primary-color-rgb, 25, 118, 210), 0.12); /* 悬停时背景色加深 */
    transform: translateY(-1px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1); /* 添加轻微阴影 */
}

.project-description {
    margin-bottom: 2rem;
}

.project-description p {
    color: var(--text-secondary);
    line-height: 1.6; /* Material Design推荐的行高 */
    font-size: 1rem;
    margin: 0;
    font-weight: 400; /* 正文推荐权重 */
    letter-spacing: 0.01em; /* 轻微增加字母间距提高可读性 */
}

.project-highlights {
    margin-bottom: 2rem;
}

.highlight-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.highlight-item h4 {
    color: var(--primary-color);
    font-size: 1.1rem;
    font-weight: 500; /* Material Design推荐的标题权重 */
    margin: 0 0 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: -0.01em; /* 轻微的字母间距调整 */
    padding: 0.5rem 0; /* 增加上下内边距 */
    position: relative; /* 为底部边框做准备 */
}

.highlight-item h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--primary-color);
    border-radius: 1px;
    opacity: 0.7;
}

.highlight-item h4::before {
    content: '';
    width: 4px;
    height: 24px;
    background: var(--primary-color);
    border-radius: 4px; /* 更圆润的边角 */
    margin-right: 8px; /* 增加间距 */
}

.highlight-item ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.highlight-item li {
    position: relative;
    padding-left: 1.75rem; /* 增加左侧内边距 */
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 0.95rem;
    transition: transform 0.2s ease; /* 添加过渡效果 */
}

.highlight-item li:hover {
    transform: translateX(2px); /* 悬停时轻微右移 */
}

.highlight-item li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.5rem; /* 垂直居中对齐 */
    width: 8px;
    height: 8px;
    background-color: var(--primary-color);
    border-radius: 50%; /* 圆形标记 */
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.project-tags .tag {
    background: rgba(25, 118, 210, 0.12); /* 半透明背景，更符合Material Design芯片设计 */
    color: var(--primary-color); /* 使用主色调作为文字颜色 */
    padding: 0.5rem 1rem;
    border-radius: 8px; /* Material Design 3.0的芯片圆角 */
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(25, 118, 210, 0.2); /* 添加细微边框 */
}

.project-tags .tag:hover {
    background: rgba(25, 118, 210, 0.18); /* 悬停时背景色加深 */
    transform: translateY(-1px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1); /* 添加轻微阴影 */
}

/* Responsive Design for Timeline */
@media (max-width: 768px) {
    .timeline {
        padding: 1rem;
        flex-direction: column;
        gap: 2rem;
        max-width: 100%;
    }
    
    .timeline::before {
        display: none;
    }
    
    .timeline-markers {
        display: none;
    }
    
    .timeline-content-wrapper {
        gap: 2rem;
    }
    
    .timeline-item {
        margin: 0;
    }
    
    .timeline-content {
        padding: 2rem;
        max-width: 100%;
    }
    
    .project-header {
        gap: 1rem;
    }
    
    .project-icon {
        width: 50px;
        height: 50px;
    }
    
    .project-icon i {
        font-size: 1.25rem;
    }
    
    .project-title {
        font-size: 1.3rem;
    }
    
    .highlight-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .project-tags {
        gap: 0.5rem;
    }
    
    .project-tags .tag {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }
}



/* Articles Page Styles */
/* 使用 --gradient-articles 变量定义渐变背景 */
.articles-hero {
    background: var(--gradient-articles);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.filter-tabs, .articles-filter {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.filter-tab, .filter-btn {
    padding: 0.8rem 1.5rem;
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 25px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.filter-tab.active, .filter-btn.active,
.filter-tab:hover, .filter-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.articles-grid, .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
    grid-auto-rows: 1fr; /* 确保每行的卡片高度一致 */
}

/* 响应式调整 */
@media (max-width: 768px) {
    .articles-grid, .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 1.5rem;
    }
    
    .article-image {
        height: 160px;
    }
    
    .article-title {
        font-size: 1.25rem;
    }
    
    .article-excerpt {
        font-size: 0.875rem;
        -webkit-line-clamp: 2;
    }
    
    .read-more {
        padding: 0.4rem 0.75rem;
        font-size: 0.8125rem;
    }
}

@media (max-width: 480px) {
    .articles-grid, .projects-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .article-image {
        height: 140px;
    }
    
    .article-content {
        padding: 1.25rem 1.25rem 1rem;
    }
    
    .article-meta {
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    
    .article-tags {
        margin-bottom: 1rem;
    }
}

.article-card, .project-card {
    background: var(--surface-color);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: var(--elevation-1);
    position: relative;
}

.article-card:hover, .project-card:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: var(--elevation-3);
}

.article-card::after, .project-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--primary-color);
    opacity: 0;
    transition: opacity 0.2s ease;
    pointer-events: none;
    z-index: 1;
}

.article-card:active::after, .project-card:active::after {
    opacity: 0.08; /* 点击时的涟漪效果 */
}

/* Material Design 涟漪效果 */
.ripple-effect {
    position: absolute;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.3);
    transform: scale(0);
    animation: ripple 0.6s linear;
    pointer-events: none;
    z-index: 1;
}

@keyframes ripple {
    to {
        transform: scale(2);
        opacity: 0;
    }
}

.article-image {
    width: 100%;
    height: 180px;
    background: linear-gradient(145deg, var(--primary-color), var(--secondary-variant));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    flex-shrink: 0; /* 防止图片区域被压缩 */
    position: relative;
    overflow: hidden;
}

.article-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, rgba(255,255,255,0.2), transparent 70%);
    z-index: 1;
}

.article-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    background-color: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    backdrop-filter: blur(4px);
    z-index: 2;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.article-card:hover .article-placeholder {
    transform: scale(1.1) translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
}

/* 图标已移除，保留占位符样式 */

.article-content {
    padding: 1.5rem 1.5rem 1.25rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
    position: relative;
    z-index: 2;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

.article-date {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.article-date::before {
    content: '\f073'; /* Font Awesome calendar icon */
    font-family: 'Font Awesome 5 Free';
    font-size: 0.75rem;
    opacity: 0.8;
}

.article-category {
    background-color: rgba(var(--primary-color-rgb), 0.1);
    color: var(--primary-color);
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: background-color 0.2s ease;
}

.article-category:hover {
    background-color: rgba(var(--primary-color-rgb), 0.15);
}

.article-title {
    font-size: 1.375rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.3;
    letter-spacing: -0.01em;
    transition: color 0.2s ease;
}

.article-card:hover .article-title {
    color: var(--primary-color);
}

.article-excerpt {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.25rem;
    flex-grow: 1;
    font-size: 0.9375rem;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.tag {
    background-color: var(--surface-variant);
    color: var(--text-secondary);
    padding: 0.3rem 0.75rem;
    border-radius: 16px;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.01em;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    height: 24px;
}

.tag:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.read-more {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.025em;
    text-transform: uppercase;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
    align-self: flex-start;
    margin-top: auto;
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.read-more::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: currentColor;
    opacity: 0;
    transition: opacity 0.2s ease;
    border-radius: 8px;
    z-index: -1;
}

.read-more i {
    font-size: 0.75rem;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.read-more:hover {
    gap: 0.75rem;
    background-color: rgba(var(--primary-color-rgb), 0.08);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.read-more:hover i {
    transform: translateX(2px);
}

.read-more:active {
    box-shadow: 0 1px 2px rgba(0,0,0,0.05);
    transform: translateY(1px);
}

.read-more:active::after {
    opacity: 0.12;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    margin: 3rem 0;
}

.pagination button {
    padding: 0.8rem 1.2rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.pagination button:hover,
.pagination button.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.newsletter {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.newsletter-form {
    display: flex;
    max-width: 400px;
    margin: 2rem auto 0;
    gap: 1rem;
}

.newsletter-form input {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
}

.newsletter-form button {
    padding: 1rem 2rem;
    background: white;
    color: var(--primary-color);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.newsletter-form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

/* Contact Page Styles */
/* 使用 --gradient-contact 变量定义渐变背景 */
.contact-hero {
    background: var(--gradient-contact);
    color: white;
    padding: 120px 0 60px;
    text-align: center;
}

.contact-hero .hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.contact-hero .hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Quick Contact Section */
.quick-contact {
    padding: 4rem 0;
    background: var(--surface-color);
}

.quick-contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.contact-card {
    background: var(--surface-color);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--elevation-2);
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--elevation-4);
}

.contact-card .contact-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.contact-card .contact-icon i {
    color: white;
    font-size: 1.5rem;
}

.contact-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.contact-card .contact-value {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    display: block;
}

.contact-card .contact-note {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Contact Form Section */
.contact-form-section {
    padding: 4rem 0;
    background: var(--background-color);
}

.form-header {
    text-align: center;
    margin-bottom: 3rem;
}

.form-header .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.form-header .section-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.form-container {
    max-width: 800px;
    margin: 0 auto;
}

.contact-form {
    background: var(--surface-color);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--elevation-2);
    border: 1px solid var(--border-color);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group label {
    display: block;
    margin-bottom: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.2rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    background: var(--surface-color);
    color: var(--text-primary);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(var(--primary-color-rgb), 0.1);
    transform: translateY(-1px);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin: 2rem 0;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
    cursor: pointer;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin: 0;
    accent-color: var(--primary-color);
}

.form-actions {
    text-align: center;
    margin-top: 2rem;
}

.submit-btn {
    padding: 1.2rem 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    min-width: 200px;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--elevation-3);
}

.form-note {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Additional Info Section */
.additional-info {
    padding: 4rem 0;
    background: var(--surface-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.info-card {
    background: var(--background-color);
    padding: 2rem;
    border-radius: 16px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.info-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--elevation-2);
}

.info-card .info-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.info-card .info-icon i {
    color: white;
    font-size: 1.2rem;
}

.info-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.info-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.response-time {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    margin-top: 2rem;
}

.response-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.response-icon i {
    color: white;
    font-size: 1rem;
}

.response-text h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.response-text p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
}

.contact-form-container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    height: fit-content;
}

.form-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(var(--primary-color-rgb), 0.1);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: auto;
    margin: 0;
}

.submit-btn {
    width: 100%;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.form-note {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-align: center;
}

/* FAQ Section */
.faq {
    background: var(--background-color);
    padding: 4rem 0;
}

.faq-header {
    text-align: center;
    margin-bottom: 3rem;
}

.faq-header .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.faq-header .section-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item:hover {
    box-shadow: var(--elevation-2);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    cursor: pointer;
    background: var(--surface-color);
    border: none;
    width: 100%;
    text-align: left;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--surface-variant);
}

.faq-question h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin: 0;
    flex: 1;
}

.faq-question i {
    color: var(--primary-color);
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 2rem 1.5rem;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
    font-size: 0.95rem;
}

/* Social Section */
.social-section {
    padding: 4rem 0;
    background: var(--surface-color);
}

.social-header {
    text-align: center;
    margin-bottom: 3rem;
}

.social-header .section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.social-header .section-description {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.social-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.social-card {
    background: var(--background-color);
    padding: 2rem;
    border-radius: 16px;
    text-decoration: none;
    color: var(--text-primary);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
}

.social-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--elevation-3);
    border-color: var(--primary-color);
    text-decoration: none;
    color: var(--text-primary);
}

.social-card .social-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.social-card .social-icon i {
    color: white;
    font-size: 1.5rem;
}

.social-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.social-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

/* Responsive Design for New Pages */
@media (max-width: 768px) {
    /* Contact Page Responsive */
    .contact-hero {
        padding: 3rem 0;
    }
    
    .contact-hero h1 {
        font-size: 2rem;
    }
    
    .contact-hero p {
        font-size: 1rem;
    }
    
    .quick-contact {
        padding: 3rem 0;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .contact-card {
        padding: 1.5rem;
    }
    
    .contact-form-section {
        padding: 3rem 0;
    }
    
    .form-header .section-title {
        font-size: 2rem;
    }
    
    .form-container {
        padding: 2rem 1.5rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .additional-info {
        padding: 3rem 0;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .info-card {
        padding: 1.5rem;
    }
    
    .faq {
        padding: 3rem 0;
    }
    
    .faq-header .section-title {
        font-size: 2rem;
    }
    
    .faq-question {
        padding: 1rem 1.5rem;
    }
    
    .faq-answer {
        padding: 0 1.5rem 1rem;
    }
    
    .social-section {
        padding: 3rem 0;
    }
    
    .social-header .section-title {
        font-size: 2rem;
    }
    
    .social-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .social-card {
        padding: 1.5rem;
    }
    
    /* Other Pages Responsive */
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .filter-tabs {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 1rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
}

/* 概要卡片样式 */
/* Material Design 卡片组件 */
.overview-card {
    background: var(--surface-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--elevation-1);
    border: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 1.5rem;
    width: 100%;
    min-height: 140px;
    height: fit-content;
    position: relative;
    overflow: hidden;
}

.overview-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.overview-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--elevation-4);
}

.overview-card:hover::before {
    transform: scaleX(1);
}

/* Material Design 图标容器 */
.overview-icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    margin-top: 0.25rem;
    box-shadow: var(--elevation-2);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.overview-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    transform: scale(0);
    border-radius: inherit;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.overview-card:hover .overview-icon {
    transform: scale(1.05) rotate(5deg);
    box-shadow: var(--elevation-3);
}

.overview-card:hover .overview-icon::before {
    transform: scale(1);
}

.overview-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 100px;
}

.overview-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

.overview-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 1rem;
    flex-grow: 1;
}

.overview-stats {
    display: flex;
    justify-content: flex-start;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 0.75rem;
}

/* Material Design 统计项 */
.stat-item {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--surface-variant);
    border: none;
    border-radius: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    min-width: 90px;
    box-shadow: var(--elevation-1);
    position: relative;
    overflow: hidden;
}

.stat-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.stat-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--elevation-2);
    background: var(--surface-color);
}

.stat-item:hover::before {
    transform: scaleX(1);
}

.stat-number {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.25rem;
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
    line-height: 1;
}

/* Material Design 链接按钮 */
.overview-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 24px;
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    align-self: flex-start;
    margin-top: auto;
    box-shadow: var(--elevation-1);
    position: relative;
    overflow: hidden;
}

.overview-link::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.overview-link:hover {
    background: var(--primary-variant);
    transform: translateY(-2px);
    box-shadow: var(--elevation-2);
}

.overview-link:hover::before {
    width: 200px;
    height: 200px;
}

.overview-link i {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
    position: relative;
}

.overview-link:hover i {
    transform: translateX(3px);
}

/* 概要高亮标签样式 */
.overview-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin-bottom: 0.75rem;
}

.highlight-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--primary-color-light, rgba(74, 144, 226, 0.1));
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--primary-color-light, rgba(74, 144, 226, 0.2));
}

/* 响应式设计 */
@media (max-width: 768px) {
    .overview-card {
        flex-direction: column;
        padding: 1.5rem;
        gap: 1rem;
        max-width: 100%;
        min-height: auto;
    }
    
    .overview-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
        margin-top: 0;
        align-self: center;
    }
    
    .overview-content {
        text-align: center;
        min-height: auto;
    }
    
    .overview-title {
        font-size: 1.25rem;
    }
    
    .overview-description {
        font-size: 0.9rem;
    }
    
    .overview-stats {
        justify-content: center;
        gap: 1rem;
    }
    
    .stat-number {
        font-size: 1.1rem;
    }
    
    .overview-highlights {
        justify-content: center;
    }
    
    .overview-link {
        align-self: center;
        margin-top: 0.5rem;
    }
}

/* 暗色主题适配 */
[data-theme="dark"] .overview-card {
    background: var(--surface-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .overview-icon {
    background: var(--gradient-primary);
}

/* About Page - Material Design Styles */

/* 专业领域样式 */
.expertise-areas {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.area-item {
    background: var(--surface-color);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.area-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.area-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.area-item:hover::before {
    transform: scaleX(1);
}

.area-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.area-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.area-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.area-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.skill-tag {
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-color);
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(37, 99, 235, 0.2);
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

/* 核心技能样式 */
.skills-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2.5rem;
    margin-top: 2rem;
}

.skill-category {
    background: var(--surface-color);
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-category::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--gradient-secondary);
    transform: scaleX(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-category:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.skill-category:hover::before {
    transform: scaleX(1);
}

.category-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.category-title::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.2);
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.skill-item {
    background: rgba(37, 99, 235, 0.03);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid rgba(37, 99, 235, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.skill-item:hover {
    background: rgba(37, 99, 235, 0.06);
    border-color: rgba(37, 99, 235, 0.2);
    transform: translateY(-2px);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.skill-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.skill-badge {
    background: var(--gradient-primary);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.skill-badge.cert {
    background: var(--gradient-secondary);
    box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
}

/* 证书图片样式 */
.cert-image-placeholder {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--surface-color);
    border: 2px solid var(--border-color);
}

.cert-image-placeholder:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.cert-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease;
}

.cert-image:hover {
    transform: scale(1.1);
}

/* 图片加载失败时的占位符样式 */
.cert-image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f0f0f0, #e0e0e0);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #999;
    z-index: -1;
}

.cert-image-placeholder {
    position: relative;
}

/* 技能图片样式 */
.skill-image-placeholder {
    width: 50px;
    height: 50px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--surface-color);
    border: 2px solid var(--border-color);
    position: relative;
}

.skill-image-placeholder:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.skill-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease;
}

.skill-image:hover {
    transform: scale(1.1);
}

/* 技能图片加载失败时的占位符样式 */
.skill-image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f8f9fa, #e9ecef);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #6c757d;
    z-index: -1;
}

.skill-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* 教育背景样式 */
.education-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.education-item {
    background: var(--surface-color);
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 2rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.education-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 6px;
    background: var(--gradient-primary);
    transform: scaleY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.education-item:hover {
    transform: translateX(8px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.education-item:hover::before {
    transform: scaleY(1);
}

.education-image-placeholder {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--surface-color);
    border: 3px solid var(--border-color);
    position: relative;
    flex-shrink: 0;
}

.education-image-placeholder:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

.education-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.3s ease;
}

.education-image:hover {
    transform: scale(1.1);
}

/* 教育背景图片加载失败时的占位符样式 */
.education-image-placeholder::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    z-index: -1;
}

.education-content h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    line-height: 1.3;
}

.education-content .institution {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.education-content .year {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.education-content .description {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* 职业理念样式 */
.vision-content {
    margin-top: 2rem;
}

.vision-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.vision-item {
    background: var(--surface-color);
    border-radius: 24px;
    padding: 3rem 2rem;
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.vision-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(14, 165, 233, 0.05));
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.vision-item:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.vision-item:hover::before {
    opacity: 1;
}

.vision-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    font-size: 2.25rem;
    color: white;
    position: relative;
    z-index: 1;
    box-shadow: 0 8px 32px rgba(37, 99, 235, 0.4);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.vision-item:hover .vision-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 0 12px 40px rgba(37, 99, 235, 0.5);
}

.vision-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
}

.vision-description {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
    position: relative;
    z-index: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .expertise-areas {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .skills-categories {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .skill-category {
        padding: 2rem;
    }
    
    .education-item {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
        gap: 1.5rem;
    }
    
    .education-image-placeholder {
        width: 64px;
        height: 64px;
    }
    
    .education-image-placeholder::before {
        font-size: 1.75rem;
    }
    
    .vision-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .vision-item {
        padding: 2.5rem 1.5rem;
    }
    
    .vision-icon {
        width: 64px;
        height: 64px;
        font-size: 1.75rem;
    }
}

/* 暗色主题适配 */
[data-theme="dark"] .area-item,
[data-theme="dark"] .skill-category,
[data-theme="dark"] .education-item,
[data-theme="dark"] .vision-item {
    background: var(--surface-color);
    border-color: var(--border-color);
}

[data-theme="dark"] .skill-tag {
    background: rgba(59, 130, 246, 0.15);
    border-color: rgba(59, 130, 246, 0.3);
}

[data-theme="dark"] .skill-tag:hover {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .skill-bar {
    background: rgba(59, 130, 246, 0.15);
}