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

/* CSS变量定义 */
:root {
    /* 深色主题配色 */
    --primary-color: #0a0e1a;
    --secondary-color: #ffffff;
    --accent-color: #00d4ff;
    --accent-color-2: #7b2ff7;
    --accent-color-3: #00f5ff;
    --text-color: #e0e6ed;
    --light-text: #a0a8b0;
    --background-color: #0f1419;
    --section-padding: 2rem;
    --transition: all 0.3s ease;
    
    /* 玻璃态效果变量 */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.3);
    
    /* 渐变背景 */
    --gradient-1: linear-gradient(135deg, #0a0e1a 0%, #1a1f3a 50%, #0f1419 100%);
    --gradient-2: linear-gradient(135deg, #1a1f3a 0%, #2a1f4a 50%, #1a1f3a 100%);
    --gradient-accent: linear-gradient(135deg, #00d4ff 0%, #7b2ff7 100%);
    --gradient-text: linear-gradient(135deg, #00d4ff 0%, #00f5ff 50%, #7b2ff7 100%);
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: var(--gradient-1);
    background-attachment: fixed;
    overflow-x: hidden;
    scroll-behavior: smooth;
    position: relative;
}

/* 动态背景效果 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(123, 47, 247, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(0, 245, 255, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
    animation: backgroundShift 20s ease-in-out infinite;
}

@keyframes backgroundShift {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.1);
    }
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 14, 26, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    z-index: 1000;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
}

.navbar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--gradient-accent);
    opacity: 0.5;
}

.navbar-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 70px;
}

.logo {
    height: 70px;
    display: flex;
    align-items: center;
    padding: 5px 0;
}

.logo img {
    height: 70px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.1);
    transition: var(--transition);
}

.logo:hover img {
    filter: brightness(1.3) drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    list-style: none;
}

.nav-item {
    margin-left: 2rem;
}

.nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    position: relative;
    border-radius: 6px;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 6px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
    z-index: -1;
}

.nav-link:hover {
    color: var(--secondary-color);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.nav-link:hover::before {
    opacity: 0.2;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: var(--transition);
    box-shadow: 0 0 10px var(--accent-color);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-actions {
    display: flex;
    align-items: center;
    margin-left: 1.5rem;
}

.language-toggle {
    background: var(--glass-bg);
    backdrop-filter: blur(12px) saturate(160%);
    -webkit-backdrop-filter: blur(12px) saturate(160%);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 0.5rem 0.9rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    letter-spacing: 0.5px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
    transition: var(--transition);
}

.language-toggle:hover {
    color: var(--secondary-color);
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(123, 47, 247, 0.15));
    border-color: rgba(0, 212, 255, 0.4);
    box-shadow: 0 12px 32px rgba(0, 212, 255, 0.25);
}

.language-toggle:focus {
    outline: 2px solid rgba(0, 212, 255, 0.5);
    outline-offset: 2px;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    cursor: pointer;
}

.bar {
    display: block;
    width: 25px;
    height: 3px;
    margin: 5px auto;
    transition: var(--transition);
    background-color: var(--secondary-color);
}

/* 主内容区域 */
main {
    margin-top: 70px;
    position: relative;
    z-index: 1;
}

/* 单页滚动布局 */
.section {
    min-height: calc(100vh - 70px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--section-padding);
    position: relative;
    overflow: hidden;
}

.section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, rgba(0, 212, 255, 0.03) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
}

.section-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

/* 理念区域样式 */
#vision {
    background: transparent;
}

.main-title {
    font-size: 3.5rem;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2rem;
    line-height: 1.35;
    padding: 0.2em 0;
    text-shadow: 0 0 30px rgba(0, 212, 255, 0.3);
    animation: titleGlow 3s ease-in-out infinite;
    box-sizing: border-box;
    overflow: visible;
}

@keyframes titleGlow {
    0%, 100% {
        filter: brightness(1);
    }
    50% {
        filter: brightness(1.2);
    }
}

.vision-image {
    margin-top: 2rem;
    max-width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.vision-image img {
    max-width: 80%;
    height: auto;
    border-radius: 12px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.4),
        0 0 40px rgba(0, 212, 255, 0.2),
        inset 0 0 20px rgba(123, 47, 247, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    transition: var(--transition);
    position: relative;
}

.vision-image img:hover {
    transform: scale(1.02);
    box-shadow: 
        0 25px 70px rgba(0, 0, 0, 0.5),
        0 0 60px rgba(0, 212, 255, 0.4),
        inset 0 0 30px rgba(123, 47, 247, 0.2);
}

/* 功能区域样式 */
#features {
    background: transparent;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 3rem;
    text-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: start;
    text-align: left;
}

.features-existing,
.features-planned {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 
        0 8px 32px var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.features-existing::before,
.features-planned::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
}

.features-existing:hover,
.features-planned:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 
        0 12px 40px var(--glass-shadow),
        0 0 30px rgba(0, 212, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: rgba(0, 212, 255, 0.3);
}

.features-existing:hover::before,
.features-planned:hover::before {
    opacity: 1;
}

.features-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.features-list {
    list-style: none;
    margin-bottom: 2rem;
}

.features-list li {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    position: relative;
    padding-left: 2rem;
    transition: var(--transition);
}

.features-list li:hover {
    color: var(--accent-color);
    transform: translateX(5px);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.features-list li::before {
    content: '▸';
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    font-size: 1.2rem;
    line-height: 1;
    text-shadow: 0 0 10px var(--accent-color);
    transition: var(--transition);
}

.features-list li:hover::before {
    transform: translateX(3px);
    color: var(--accent-color-3);
}

.extra-features {
    margin-top: 1rem;
}

.extra-features ul {
    list-style: none;
    margin-left: 1.5rem;
}

.extra-features li {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    color: var(--light-text);
    transition: var(--transition);
}

.extra-features li:hover {
    color: var(--accent-color-2);
    transform: translateX(3px);
}

.extra-features li::before {
    content: '→';
    color: var(--accent-color-2);
    font-weight: normal;
    font-size: 1rem;
    text-shadow: 0 0 8px rgba(123, 47, 247, 0.5);
    transition: var(--transition);
}

.extra-features li:hover::before {
    transform: translateX(3px);
    color: var(--accent-color-3);
}

/* 视频区域样式 */
.video-section {
    margin-top: 2rem;
    width: 100%;
}

/* 视频容器 */
.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16/9;
    overflow: hidden;
    border-radius: 12px;
    margin-bottom: 1rem;
}

/* 视频项 */
.video-item {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.video-item.active {
    opacity: 1;
    pointer-events: auto;
}

/* 视频预览位 */
.video-placeholder {
    background: var(--glass-bg);
    backdrop-filter: blur(10px) saturate(180%);
    -webkit-backdrop-filter: blur(10px) saturate(180%);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px var(--glass-shadow);
}

.video-placeholder::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
    z-index: 0;
}

.video-placeholder:hover {
    transform: scale(1);
    box-shadow: 
        0 12px 40px var(--glass-shadow),
        0 0 30px rgba(0, 212, 255, 0.3);
    border-color: rgba(0, 212, 255, 0.5);
}

.video-placeholder:hover::after {
    opacity: 0.1;
}

.video-placeholder::before {
    content: '▶';
    font-size: 2.5rem;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    color: var(--accent-color);
    text-shadow: 0 0 20px var(--accent-color);
    z-index: 1;
    transition: var(--transition);
}

.video-placeholder:hover::before {
    transform: translate(-50%, -50%) scale(1.2);
    color: var(--accent-color-3);
    text-shadow: 0 0 30px var(--accent-color-3);
}

.video-placeholder span {
    position: relative;
    z-index: 2;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-color);
    transition: var(--transition);
}

.video-placeholder:hover span {
    color: var(--accent-color);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

/* 视频帧 */
.video-frame {
    position: relative;
    width: 100%;
    height: 100%;
    border-radius: 12px;
    overflow: hidden;
}

.video-frame iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
    border-radius: 12px;
}

/* 简化视频区域样式，仅显示单个视频 */
.video-section {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* 视频导航箭头 */
.video-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: rgba(0, 0, 0, 0.5);
    color: var(--secondary-color);
    font-size: 1.3rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease, background 0.3s ease, border-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.video-container:hover .video-nav {
    opacity: 1;
}

.video-nav:hover {
    background: rgba(0, 212, 255, 0.3);
    border-color: var(--accent-color);
}

.video-nav:active {
    background: rgba(0, 212, 255, 0.5);
}

.video-nav-prev {
    left: 8px;
}

.video-nav-next {
    right: 8px;
}

.video-nav.hidden {
    display: none;
}

/* 关于我们区域样式 */
#about, #contact {
    background: transparent;
}

/* 关于我们内容样式 */
.about-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    text-align: left;
    max-width: 900px;
    margin: 0 auto;
}

.about-section {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 16px;
    box-shadow: 
        0 8px 32px var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.about-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
}

.about-section:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 
        0 12px 40px var(--glass-shadow),
        0 0 30px rgba(0, 212, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: rgba(0, 212, 255, 0.3);
}

.about-section:hover::before {
    opacity: 1;
}

.about-subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
    text-align: center;
}

.about-list {
    list-style: none;
    padding: 0;
}

.about-list li {
    margin-bottom: 0.75rem;
    color: var(--text-color);
    position: relative;
    padding-left: 2rem;
    line-height: 1.5;
    transition: var(--transition);
}

.about-list li:hover {
    color: var(--accent-color);
    transform: translateX(5px);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.about-list li::before {
    content: '▸';
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: 0;
    font-size: 1.2rem;
    line-height: 1.5;
    text-shadow: 0 0 10px var(--accent-color);
    transition: var(--transition);
}

.about-list li:hover::before {
    transform: translateX(3px);
    color: var(--accent-color-3);
}

/* 联系我们内容样式 */
.contact-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: left;
}

.contact-section {
    margin-bottom: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 
        0 8px 32px var(--glass-shadow),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.contact-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
    opacity: 0;
    transition: var(--transition);
}

.contact-section:hover {
    transform: translateY(-5px);
    box-shadow: 
        0 12px 40px var(--glass-shadow),
        0 0 30px rgba(0, 212, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    border-color: rgba(0, 212, 255, 0.3);
}

.contact-section:hover::before {
    opacity: 1;
}

.contact-subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.contact-info {
    font-size: 1.1rem;
    color: var(--text-color);
    margin: 0;
    font-weight: 500;
}

.contact-list {
    list-style: none;
    padding: 0;
}

.contact-list li {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.1rem;
    line-height: 1.8;
}

/* 多个邮箱上下排列；标签与第一个邮箱按文字基线对齐 */
.contact-list li.contact-email-row {
    display: flex;
    align-items: baseline;
}

.contact-emails {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.contact-link {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    padding: 0.2rem 0;
}

.contact-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-accent);
    transition: var(--transition);
    box-shadow: 0 0 10px var(--accent-color);
}

.contact-link:hover {
    color: var(--accent-color-3);
    text-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    /* 导航栏响应式 */
    .navbar-container {
        padding: 0 1rem;
    }

    .hamburger {
        display: block;
    }

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

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(10, 14, 26, 0.95);
        backdrop-filter: blur(20px) saturate(180%);
        -webkit-backdrop-filter: blur(20px) saturate(180%);
        border-right: 1px solid var(--glass-border);
        width: 100%;
        text-align: center;
        transition: var(--transition);
        box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

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

    .nav-item {
        margin: 1.5rem 0;
    }

    .nav-actions {
        margin-left: 0;
    }

    .language-toggle {
        padding: 0.45rem 0.85rem;
        font-size: 0.95rem;
    }

    /* 单页滚动响应式 */
    .section {
        min-height: calc(100vh - 70px);
        padding: 2rem 1rem;
    }

    /* 理念区域响应式 */
    .main-title {
        font-size: 2rem;
        line-height: 1.35;
        padding: 0.2em 0;
    }

    .vision-image img {
        max-width: 100%;
    }

    /* 功能区域响应式 */
    .section-title {
        font-size: 2rem;
    }

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

    .features-list {
        text-align: left;
    }

    .video-section {
        margin-top: 1.5rem;
    }
    
    .video-placeholder {
        height: 100%;
    }

    .video-nav {
        width: 30px;
        height: 30px;
        font-size: 1.1rem;
        opacity: 0.7;
    }

    /* 关于我们区域响应式 */
    .about-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .about-section,
    .contact-section {
        padding: 1.5rem;
    }
    
    .about-subtitle,
    .contact-subtitle {
        font-size: 1.1rem;
    }
    
    .about-list li,
    .contact-list li {
        font-size: 0.95rem;
    }
}

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

::-webkit-scrollbar-track {
    background: rgba(10, 14, 26, 0.5);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-accent);
    border-radius: 4px;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color-3);
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.7);
}

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

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.section {
    animation: fadeIn 1s ease-out;
}

.features-existing {
    animation: slideInLeft 1s ease-out 0.2s both;
}

.features-planned {
    animation: slideInRight 1s ease-out 0.2s both;
}

.about-section {
    animation: fadeIn 0.8s ease-out both;
}

.about-section:nth-child(1) { animation-delay: 0.1s; }
.about-section:nth-child(2) { animation-delay: 0.2s; }
.about-section:nth-child(3) { animation-delay: 0.3s; }
.about-section:nth-child(4) { animation-delay: 0.4s; }

/* 防止文本选中 */
.no-select {
    user-select: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
}
/* 页脚 */
.site-footer {
    position: relative;
    z-index: 1;
    padding: 1.5rem 1rem 2rem;
    text-align: center;
    border-top: 1px solid var(--glass-border);
}

.footer-company {
    font-size: 0.75rem;
    color: var(--light-text);
    letter-spacing: 0.05em;
    opacity: 0.8;
}