/* 极简、自然、微暗黑风格 */
:root {
    --bg-color: #0d0d0d; /* 非常深的深空灰，比纯黑自然 */
    --text-main: #e0e0e0; /* 柔和的灰白，不刺眼 */
    --text-muted: #666666; 
}

/* 语言切换按钮样式 */
.lang-toggle {
    position: absolute;
    top: 40px;
    right: 50px;
    color: #fff;
    text-decoration: none;
    font-size: 0.85rem;
    letter-spacing: 1px;
    border: 1px solid #555;
    padding: 6px 16px;
    border-radius: 20px;
    transition: all 0.3s ease;
    z-index: 1000; /* 确保它在最上层不被挡住 */
}

.lang-toggle:hover {
    background-color: #ffffff;
    color: #000000;
    border-color: #ffffff;
}

/* 手机端适配：屏幕变小时调整位置 */
@media (max-width: 768px) {
    .lang-toggle {
        top: 20px;
        right: 20px;
    }
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.8;
}

/* 居中首屏 */
.hero-section {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* 顶部居中导航 */
.top-nav-centered {
    position: absolute;
    top: 50px;
    display: flex;
    gap: 40px; /* 链接之间的间距 */
}

.top-nav-centered a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.3s ease;
}

.top-nav-centered a:hover {
    color: var(--text-main);
}

/* 居中大标题 */
.hero-center-content {
    text-align: center;
}

.hero-center-content h1 {
    font-size: 4rem;
    font-weight: 300; /* 使用细体字，更显高级自然 */
    letter-spacing: 4px;
    margin: 0 0 10px 0;
    color: #ffffff;
}

.hero-center-content p {
    color: var(--text-muted);
    font-size: 1rem;
    letter-spacing: 2px;
    margin: 0;
}

/* About 区域排版 */
.about-section {
    padding: 100px 20px;
    display: flex;
    justify-content: center;
}

.about-container-centered {
    max-width: 600px; /* 控制文本宽度，阅读更舒适 */
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.about-portrait-small {
    width: 120px;
    height: 120px;
    border-radius: 50%; /* 把照片变成圆形，显得更自然亲和 */
    object-fit: cover;
    opacity: 0.8;
    filter: grayscale(50%);
}

.about-text p {
    font-size: 1.1rem;
    color: #aaaaaa;
    font-weight: 300;
}