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

:root {
    /* 主色调 - 深蓝色系 */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    
    /* 文字颜色 */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-light: #9ca3af;
    
    /* 背景颜色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-dark: #111827;
    
    /* 边框和阴影 */
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* 过渡动画 */
    --transition: all 0.3s ease;
}

/* 深色主题 */
.dark-theme {
    /* 主色调 - 在深色背景下更明显 */
    --primary-color: #3b82f6;
    
    /* 文字颜色 */
    --text-primary: #f3f4f6;
    --text-secondary: #d1d5db;
    --text-light: #9ca3af;
    
    /* 背景颜色 */
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    
    /* 边框和阴影 */
    --border-color: #374151;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    
    /* 背景颜色 */
    background-color: var(--bg-primary);
}

/* 深色主题下的导航栏 */
.dark-theme .header {
    background-color: rgba(17, 24, 39, 0.95);
    border-bottom: 1px solid var(--border-color);
}

/* 深色主题下的卡片 */
.dark-theme .card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
}

/* 深色主题下的表单 */
.dark-theme .form-group input,
.dark-theme .form-group textarea {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

/* 深色主题下的按钮 */
.dark-theme .btn {
    border: 1px solid var(--border-color);
}

/* 深色主题下的页脚 */
.dark-theme .footer {
    background-color: #000000;
    border-top: 1px solid var(--border-color);
}

/* 深色主题下的英雄区 */
.dark-theme .hero {
    background: var(--bg-primary);
}

/* 深色主题下的body元素 */
.dark-theme body {
    background-color: var(--bg-primary) !important;
}

/* 深色主题下的联系信息链接 */
.dark-theme .contact-link {
    color: white;
    text-shadow: 0 0 2px #3b82f6, 0 0 4px #3b82f6;
}

/* 深色主题下的AI对话 */
.dark-theme .chat-drawer {
    background-color: var(--bg-primary);
    border-left: 1px solid var(--border-color);
}

.dark-theme .chat-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.dark-theme .chat-messages {
    background-color: var(--bg-primary);
}

.dark-theme .message.ai .message-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.dark-theme .chat-input-container {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.dark-theme .chat-input {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.dark-theme .about-text p {
    color: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 顶部导航栏 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-brand a {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.nav-brand a:hover {
    color: var(--primary-color);
}

/* 搜索功能样式 */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
}

.nav-menu-left, .nav-menu-right {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-right: -60px;
}

.nav-menu-right {
    display: flex;
    list-style: none;
    gap: var(--spacing-sm);
    align-items: center;
    justify-content: flex-end;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

/* 主题切换按钮 */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    color: var(--primary-color);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* 全屏按钮 */
.fullscreen-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--text-secondary);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.fullscreen-btn:hover {
    color: var(--primary-color);
}

.fullscreen-btn svg {
    width: 20px;
    height: 20px;
}

/* 时间显示样式 */
.nav-time {
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
}

.dark-theme .nav-time {
    color: #e5e7eb;
}

/* 搜索功能样式 */
.search-container {
    position: relative;
    display: flex;
    align-items: center;
    flex-direction: row-reverse;
}

.search-input {
    padding: 0.5rem 0.75rem 0.5rem 2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: all 0.3s ease;
    width: 0;
    opacity: 0;
    visibility: hidden;
    margin-right: 0.5rem;
}

.search-input.expanded {
    width: 220px;
    opacity: 1;
    visibility: visible;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-btn {
    position: relative;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    z-index: 1;
}

.search-btn:hover {
    color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.1);
}

.search-btn:active {
    transform: scale(0.95);
    transition: transform 0.1s ease;
}

/* 深色主题下的搜索功能 */
.dark-theme .search-input {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

.dark-theme .search-input:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.dark-theme .search-btn {
    color: var(--text-light);
}

.dark-theme .search-btn:hover {
    color: var(--primary-light);
    background-color: rgba(59, 130, 246, 0.1);
}

/* 搜索高亮样式 */
.search-highlight {
    background-color: #fef3c7;
    color: #92400e;
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-weight: 500;
}

/* 深色主题下的搜索高亮 */
.dark-theme .search-highlight {
    background-color: #3b82f6;
    color: white;
}

/* 搜索结果样式 */
.search-results {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 400px;
    max-height: 600px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    overflow: hidden;
    display: none;
}

.search-results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.search-results-header h3 {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.search-results-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.search-results-close:hover {
    background-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
}

.search-results-content {
    padding: var(--spacing-md);
    max-height: 500px;
    overflow-y: auto;
}

.search-result-item {
    display: flex;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    margin-bottom: var(--spacing-xs);
}

.search-result-item:hover {
    background-color: var(--bg-secondary);
}

.search-result-index {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: var(--spacing-sm);
    flex-shrink: 0;
}

.search-result-content {
    flex: 1;
}

.search-result-context {
    font-size: 0.875rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.4;
}

.search-result-location {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* 深色主题下的搜索结果 */
.dark-theme .search-results {
    background-color: var(--bg-primary);
    border-color: var(--border-color);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

.dark-theme .search-results-header {
    background-color: var(--bg-secondary);
    border-bottom-color: var(--border-color);
}

.dark-theme .search-results-header h3 {
    color: var(--text-primary);
}

.dark-theme .search-results-close {
    color: var(--text-light);
}

.dark-theme .search-results-close:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.dark-theme .search-result-item:hover {
    background-color: var(--bg-secondary);
}

.dark-theme .search-result-context {
    color: var(--text-primary);
}

.dark-theme .search-result-location {
    color: var(--text-light);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .search-results {
        width: calc(100% - 40px);
        right: 20px;
        left: 20px;
    }
    
    .search-input {
        width: 140px;
    }
    
    .search-input:focus {
        width: 180px;
    }
}

/* 暗模式下的微信图标放大 */
.dark-theme .wechat-icon {
    width: 28px !important;
    height: 28px !important;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

/* 首屏英雄区 */
.hero {
    min-height: 100dvh;
    display: flex;
    align-items: center;
    padding: var(--spacing-2xl) var(--spacing-md);
    padding-top: calc(80px + var(--spacing-2xl));
    background: linear-gradient(135deg, #f9fafb 0%, #ffffff 100%);
}

.hero-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.highlight {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.avatar-placeholder {
    width: 240px;
    height: 320px;
    border-radius: 50% / 40%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.avatar-container {
    position: relative;
    display: inline-block;
    text-align: center;
}

.easter-egg-text {
    position: absolute;
    top: -90px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #ff9a9e, #fad0c4, #fad0c4, #fbc2eb, #a18cd1);
    color: white;
    padding: 12px 24px;
    border-radius: 30px;
    font-size: 1.8rem;
    font-weight: 700;
    font-family: 'Comic Sans MS', 'Marker Felt', 'Chalkboard SE', 'YouYuan', sans-serif;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
    border: 2px solid #ff6b9d;
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
    transition: all 0.3s ease;
    z-index: 10;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    background-size: 200% 200%;
    animation: gradientAnimation 3s ease infinite;
}

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

.easter-egg-text.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.image-label {
    display: none;
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-primary);
    font-size: 1.3rem;
    font-weight: 600;
    font-family: 'Comic Sans MS', 'YouYuan', sans-serif;
    background-color: rgba(255, 255, 255, 0.9);
    padding: 6px 16px;
    border-radius: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    z-index: 100;
    white-space: nowrap;
}

.dark-theme .image-label {
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.1);
}

.avatar-image {
    width: 240px;
    height: 320px;
    border-radius: 50% / 40%;
    object-fit: cover;
    object-position: center;
    box-shadow: var(--shadow-lg);
    border: 4px solid white;
    transition: var(--transition);
}

.avatar-image:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

/* 关于我 */
.about {
    padding: calc(var(--spacing-2xl) * 3) 0;
    background-color: var(--bg-primary);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-xl);
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: #000000;
    font-size: 1.25rem;
    line-height: 1.8;
    font-family: '仿宋', 'FangSong', serif;
    font-weight: bold;
    text-indent: 2em;
    margin-top: var(--spacing-md);
}

.skills h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    text-align: center;
}

.skill-tags {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.skill-tag {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: var(--transition);
    width: 120px;
    text-align: center;
}

.skill-tag:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* 简历展示 */
.resume {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-primary);
}

.resume-container {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-xl);
}

.resume-item {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    max-width: 800px;
    width: 100%;
    transition: var(--transition);
}

.resume-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.resume-image {
    position: relative;
    overflow: hidden;
}

.resume-img {
    width: 100%;
    height: auto;
    object-fit: cover;
    cursor: pointer;
    transition: var(--transition);
}

.resume-item:hover .resume-img {
    transform: scale(1.02);
}

.resume-content {
    padding: var(--spacing-lg);
    text-align: center;
}

.resume-title {
    font-size: 1.25rem;
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.resume-description {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.dark-theme .resume-item {
    background-color: var(--bg-secondary);
}

.dark-theme .resume-title {
    color: var(--text-primary);
}

.dark-theme .resume-description {
    color: var(--text-secondary);
}

/* 奖状展示 */
.certificates {
    padding: calc(var(--spacing-2xl) * 3) 0;
    background-color: var(--bg-primary);
}

.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.certificate-item {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
}

.certificate-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.certificate-image {
    width: 100%;
    height: 300px;
    overflow: hidden;
}

.certificate-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.certificate-item:hover .certificate-img {
    transform: scale(1.05);
}

.certificate-content {
    padding: var(--spacing-md);
    text-align: center;
}

.certificate-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.certificate-status {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.certificate-placeholder-item {
    background-color: var(--bg-secondary);
    border: 2px dashed var(--border-color);
}

.certificate-placeholder {
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05) 0%, rgba(37, 99, 235, 0.1) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-light);
}

.placeholder-text {
    font-size: 0.875rem;
    font-weight: 500;
}

/* 深色模式下的奖状样式 */
.dark-theme .certificate-item {
    background-color: var(--bg-secondary);
}

.dark-theme .certificate-title {
    color: var(--text-light);
}

/* 下载按钮样式 */
.download-btn {
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
}

.download-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

/* 图片放大模态框 */
.modal {
    display: none;
    position: fixed;
    z-index: 9999;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
    position: relative;
    margin: 5% auto;
    padding: 20px;
    width: 90%;
    max-width: 800px;
    text-align: center;
}

.close-modal {
    position: absolute;
    top: 10px;
    right: 20px;
    color: white;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10000;
}

.close-modal:hover {
    color: #f0f0f0;
}

.modal-image {
    max-width: 100%;
    max-height: 70vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.modal-download-btn {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 36px;
    height: 36px;
    padding: 0;
    background-color: rgba(255, 255, 255, 0.9);
    color: var(--primary-color);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.modal-download-btn:hover {
    background-color: var(--primary-color);
    color: white;
    transform: scale(1.1);
}

/* 作品展示 */
.portfolio {
    padding: calc(var(--spacing-2xl) * 3) 0;
    background-color: var(--bg-primary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
}

.portfolio-item {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.portfolio-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.portfolio-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background-color: var(--bg-secondary);
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    background: linear-gradient(135deg, #e5e7eb, #f3f4f6);
}

.portfolio-content {
    padding: var(--spacing-md);
}

.portfolio-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: white;
    background-color: #2563eb;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    display: block;
}

.portfolio-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.portfolio-certificate {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.certificate-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.portfolio-certificate .certificate-img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.portfolio-certificate .certificate-img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-md);
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.portfolio-document {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.document-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    display: block;
}

.document-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

.document-link:hover {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
}

.document-link svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: rgba(255, 255, 255, 0.2);
    transition: fill 0.3s ease;
}

.document-link:hover svg {
    fill: rgba(255, 255, 255, 0.4);
}

.tag {
    padding: 0.25rem var(--spacing-sm);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.portfolio-links {
    display: flex;
    gap: var(--spacing-md);
}

.link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.link:hover {
    text-decoration: underline;
}

/* 技能介绍 */
.skills-detail {
    padding: calc(var(--spacing-2xl) * 3) 0;
    background-color: var(--bg-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.skill-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
}

.skill-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.skill-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.skill-name {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

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

/* 深色模式下的技能卡片样式 */
.dark-theme .skill-card {
    background-color: var(--bg-secondary);
}

.dark-theme .skill-name {
    color: var(--text-light);
}

.dark-theme .skill-description {
    color: var(--text-muted);
}

/* 生活照 */
.life-photos {
    padding: var(--spacing-2xl) 0;
    background-color: var(--bg-primary);
}

.photos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.photo-item {
    background-color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
}

.photo-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.photo-container {
    position: relative;
    padding-top: 100%; /* 1:1 比例 */
    overflow: hidden;
}

.photo-img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.photo-item:hover .photo-img {
    transform: scale(1.05);
}

.dark-theme .photo-item {
    background-color: var(--bg-secondary);
}

/* 联系 */
.contact {
    padding: calc(var(--spacing-2xl) * 4) 0;
    background-color: var(--bg-primary);
}

.contact-intro {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.contact-info {
    display: flex;
    flex-direction: row;
    justify-content: center;
    gap: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: var(--spacing-xl);
    text-align: left;
    flex-wrap: wrap;
}

.contact-link,
.contact-email {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
    width: auto;
    justify-content: center;
    padding-left: 0;
}

.contact-icon {
    width: 1.5rem;
    height: 1.5rem;
    min-width: 1.5rem;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 0.5rem;
}

.contact-link:hover,
.contact-email:hover {
    color: var(--primary-dark);
}

.contact-icon {
    width: 1.5rem;
    height: 1.5rem;
    min-width: 1.5rem;
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.contact-icon svg {
    width: 100%;
    height: 100%;
    stroke: var(--primary-color);
    fill: white;
    filter: drop-shadow(0 0 0.5px var(--primary-color));
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

/* 页脚 */
.footer {
    background-color: var(--primary-dark);
    color: white;
    padding: var(--spacing-xl) 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer-social h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.social-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: white;
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--primary-light);
    color: white;
    transform: translateY(-2px);
}

.social-icon {
    font-size: 0.875rem;
}

.footer-copyright {
    text-align: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

.footer-note {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-icp {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
}
.footer-icp a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-icp a:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* AI对话悬浮按钮 */
.chat-float-btn {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.chat-float-btn:hover {
    background-color: var(--primary-dark);
    transform: scale(1.1);
}

.chat-icon {
    font-size: 1.5rem;
}

/* AI对话界面 */
.chat-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.chat-overlay.active {
    opacity: 1;
    visibility: visible;
}

.chat-drawer {
    position: fixed;
    top: 0;
    right: -450px;
    width: 450px;
    height: 100dvh;
    background-color: var(--bg-primary);
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
    z-index: 1002;
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease;
}

.chat-drawer.active {
    right: 0;
}

.chat-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--bg-secondary);
}

.chat-header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chat-title-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.chat-close {
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.chat-close:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.chat-welcome {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
}

.chat-disclaimer {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--spacing-md);
    font-style: italic;
}

.chat-suggestions {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.suggestion-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    font-size: 0.875rem;
}

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

.message {
    display: flex;
    gap: var(--spacing-sm);
    animation: fadeIn 0.3s ease;
}

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

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 600;
}

.message.user .message-avatar {
    background-color: var(--primary-color);
    color: white;
}

.message.ai .message-avatar {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.message-content {
    max-width: 70%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    line-height: 1.6;
    word-wrap: break-word;
}

.message.user .message-content {
    background-color: var(--primary-color);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.ai .message-content {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.message-loading {
    display: flex;
    gap: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
}

.message-loading span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-light);
    animation: bounce 1.4s infinite ease-in-out;
}

.message-loading span:nth-child(1) {
    animation-delay: -0.32s;
}

.message-loading span:nth-child(2) {
    animation-delay: -0.16s;
}

@keyframes bounce {
    0%, 80%, 100% {
        transform: scale(0);
    }
    40% {
        transform: scale(1);
    }
}

.chat-input-area {
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md);
    background-color: var(--bg-primary);
}

.chat-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
}

.chat-input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-family: inherit;
    font-size: 0.875rem;
    resize: none;
    max-height: 120px;
    transition: var(--transition);
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.chat-send {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
}

.chat-send:hover:not(:disabled) {
    background-color: var(--primary-dark);
}

.chat-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.chat-status {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-light);
    min-height: 16px;
}

/* ==================== AI体验解锁密码弹窗 ==================== */
.password-modal {
    position: fixed;
    z-index: 10001;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: passwordFadeIn 0.2s ease;
}

@keyframes passwordFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.password-modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-lg);
    width: 90%;
    max-width: 380px;
    text-align: center;
    animation: passwordSlideIn 0.25s ease;
}

@keyframes passwordSlideIn {
    from { transform: translateY(-12px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.password-modal-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
}

.password-modal-icon {
    font-size: 1.75rem;
    line-height: 1;
}

.password-modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.password-modal-desc {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0 0 var(--spacing-md);
}

.password-input-wrapper {
    margin-bottom: var(--spacing-sm);
}

.password-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.9rem;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: var(--transition);
    box-sizing: border-box;
}

.password-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.password-error {
    color: #ef4444;
    font-size: 0.75rem;
    margin: 0 0 var(--spacing-sm);
    min-height: 16px;
}

.password-modal-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.password-btn {
    flex: 1;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    opacity: 1;
}

.password-btn-cancel {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.password-btn-cancel:hover {
    background-color: var(--border-color);
}

.password-btn-submit {
    background-color: var(--primary-color);
    color: white;
}

.password-btn-submit:hover {
    background-color: var(--primary-dark);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        transition: left 0.3s ease;
    }

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

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

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

    .chat-drawer {
        width: 100%;
        right: -100%;
    }

    .chat-float-btn {
        bottom: var(--spacing-md);
        right: var(--spacing-md);
        width: 50px;
        height: 50px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }

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

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
        text-align: center;
    }
}

/* 左下角转换按钮 */
.convert-btn {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: 0;
    background-color: transparent;
    border: none;
    border-radius: 0;
    cursor: pointer;
    z-index: 998;
    opacity: 0;
    display: block;
    line-height: 0;
    font-size: 0;
    outline: none;
    transform: translate(0, 0);
}

.convert-btn:hover {
    outline: none;
    box-shadow: none;
    opacity: 0;
}

.dark-theme .convert-btn {
    background-color: transparent;
    color: transparent;
    border-color: transparent;
}

.dark-theme .convert-btn:hover {
    background-color: transparent;
    color: transparent;
    border-color: transparent;
    opacity: 0;
}

/* =========================================================================
 * 移动端适配（≤768px）—— 纯 CSS 媒体查询，不改 JS 逻辑
 * 修复：导航菜单折叠、网格 minmax 溢出、字号/间距收紧
 * ========================================================================= */
@media (max-width: 768px) {
    /* —— 导航栏 —— */
    .nav {
        padding: var(--spacing-xs) var(--spacing-md);
    }
    .nav-left {
        gap: var(--spacing-sm);
    }
    .nav-brand {
        gap: var(--spacing-sm);
    }
    /* 隐藏搜索框、时间、全屏按钮，节省空间 */
    .search-container,
    .nav-time,
    .fullscreen-btn {
        display: none;
    }
    /* 修复 nav-right 负边距导致的溢出 */
    .nav-right {
        margin-right: 0;
    }
    /* 导航菜单改为折叠抽屉（覆盖原有 .nav-menu 不匹配的规则） */
    #navMenu.nav-menu-right {
        position: fixed;
        top: 60px;
        left: -100%;
        width: 100%;
        background-color: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        transition: left 0.3s ease;
        gap: var(--spacing-md);
        align-items: flex-start;
    }
    #navMenu.nav-menu-right.active {
        left: 0;
    }
    #navMenu .nav-link {
        font-size: 1.1rem;
    }
    .nav-toggle {
        display: flex;
    }

    /* —— 首屏英雄区 —— */
    .hero {
        padding: var(--spacing-lg) var(--spacing-md);
        padding-top: calc(70px + var(--spacing-lg));
        min-height: auto;
    }
    .hero-content {
        gap: var(--spacing-lg);
    }
    .hero-actions {
        justify-content: center;
    }
    .avatar-placeholder {
        width: 180px;
        height: 240px;
    }

    /* —— 通用容器收紧 —— */
    .container {
        padding: 0 var(--spacing-sm);
    }
    .section-title {
        font-size: 1.75rem;
    }

    /* —— 关于我 —— */
    .about-text p {
        font-size: 1rem;
        line-height: 1.7;
    }

    /* —— 网格：缩小 minmax 避免小屏溢出 —— */
    .certificates-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--spacing-lg);
    }
    .portfolio-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--spacing-lg);
    }
    .skills-grid {
        grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
        gap: var(--spacing-lg);
    }
    .photos-grid {
        gap: var(--spacing-lg);
    }
    .certificate-image {
        height: 220px;
    }

    /* —— 联系方式 —— */
    .contact-info {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-sm);
    }
    .contact-link {
        font-size: 1rem;
    }

    /* —— 图片放大模态框 —— */
    .modal-content {
        margin: 10% auto;
        padding: 12px;
        width: 95%;
    }
    .modal-image {
        max-height: 60vh;
    }
    .close-modal {
        font-size: 30px;
        right: 12px;
        top: 6px;
    }
    .modal-download-btn {
        bottom: 12px;
        right: 12px;
        width: 32px;
        height: 32px;
    }
}

/* 超小屏（≤480px）进一步收紧 */
@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }
    .hero-subtitle {
        font-size: 1rem;
    }
    .hero-description {
        font-size: 0.95rem;
    }
    .section-title {
        font-size: 1.5rem;
    }
    .avatar-placeholder {
        width: 150px;
        height: 200px;
    }
    /* 网格在超小屏强制单列，避免 260px minmax 仍偏宽 */
    .certificates-grid,
    .portfolio-grid,
    .skills-grid,
    .photos-grid {
        grid-template-columns: 1fr;
    }
    .certificate-image {
        height: 200px;
    }
    .skill-card {
        padding: var(--spacing-md);
    }
    .skill-icon {
        font-size: 2.25rem;
    }
    .skill-name {
        font-size: 1.25rem;
    }
    .password-modal-content {
        padding: var(--spacing-md);
    }
    .password-modal-actions {
        flex-direction: column;
    }
    .password-btn {
        width: 100%;
    }
}