:root {
    --bg-color: #0a0a1a; /* 深海蓝黑色 */
    --text-primary: #ffffff;
    --text-secondary: #8899a6;
    --accent-color: #007aff; /* iOS 蓝 */
    --card-bg: rgba(255, 255, 255, 0.05);
}

body {
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

.logo {
    font-weight: 700;
    font-size: 24px;
    letter-spacing: -0.5px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 20px;
    font-size: 14px;
    transition: color 0.3s;
}

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

/* Hero 区域 */
.hero {
    text-align: center;
    padding: 120px 0 80px;
}

h1 {
    font-size: 64px;
    font-weight: 800;
    margin: 0 0 20px;
    background: linear-gradient(135deg, #fff 0%, #8899a6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -2px;
}

.subtitle {
    font-size: 24px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    font-weight: 400;
}

/* 下载按钮 */
.app-store-btn {
    display: inline-block;
    background: #fff;
    color: #000;
    padding: 12px 24px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s;
}

.app-store-btn:hover {
    transform: scale(1.05);
}

/* 特性网格 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 80px 0;
}

.feature-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.1);
}

.feature-card h3 {
    margin-top: 0;
    font-size: 20px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 60px 0;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: var(--text-secondary);
    font-size: 13px;
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 10px;
}