:root {
    --primary-color: #000000;
    --secondary-color: #86868b;
    --accent-color: #0071e3;
    --background-color: #ffffff;
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--primary-color);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏样式 */
.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 44px;
    padding: 0 20px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 500;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

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

/* 主要内容区域 */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #000000 0%, #333333 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: 40px;
}

.cta-button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 980px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.cta-button:hover {
    transform: scale(1.05);
    background-color: #0077ed;
}

/* 特性区域 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 100px 20px;
}

.feature-card {
    background: rgba(255, 255, 255, 0.8);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--secondary-color);
}

/* 加载动画 */
.loading-spinner {
    margin-top: 20px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 40px 20px;
    color: var(--secondary-color);
    font-size: 0.9rem;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.2rem;
    }

    .nav-links {
        display: none;
    }

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

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}