body {
    margin: 0;
    background: #13253C;
    color: #e6e6e6;
    font-family: "Microsoft YaHei", sans-serif;
    line-height: 1.6;
}

a {
    color: #58a6ff;
    text-decoration: none;
}

a:hover {
    color: #79c0ff;
}

.navbar {
    background: #0e1b2c;
    padding: 10px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.navbar .logo {
    font-size: 32px;
    font-weight: bold;
    color: #e100ff;
    letter-spacing: 1px;
}

.navbar nav a {
    margin-left: 25px;
    color: #c9d1d9;
}

.navbar nav a.active {
    color: #58a6ff;
    border-bottom: 2px solid #58a6ff;
    padding-bottom: 3px;
}

.hero {
    text-align: center;
    padding: 120px 30px;
    background: linear-gradient(to bottom, #0d1117, #0f1218);
}

.hero h1 {
    font-size: 48px;
    color: #ffffff;
    margin-bottom: 10px;
}

.hero p {
    font-size: 18px;
    color: #c9d1d9;
}

.btn {
    display: inline-block;
    margin-top: 25px;
    padding: 12px 28px;
    background: #238636;
    color: white;
    border-radius: 6px;
    font-size: 17px;
}

.btn:hover {
    background: #2ea043;
}

.features {
    padding: 60px 30px;
    max-width: 1200px;
    margin: auto;
}

.features h2 {
    text-align: center;
    font-size: 30px;
    margin-bottom: 40px;
    color: #ffffff;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 25px;
}

.card {
    background: #161b22;
    padding: 25px;
    border-radius: 10px;
    border: 1px solid #30363d;
    transition: 0.3s;
}

.card:hover {
    border-color: #58a6ff;
    transform: translateY(-4px);
}

.card h3 {
    margin-top: 0;
    color: #79c0ff;
}

.page {
    padding: 50px 30px;
    max-width: 1000px;
    margin: auto;
}

.page h1 {
    font-size: 36px;
    margin-bottom: 30px;
    color: #ffffff;
}

.page h2 {
    margin-top: 40px;
    font-size: 24px;
    color: #79c0ff;
}

.page p,
.page li {
    color: #c9d1d9;
}

.img {
    width: 100%;
    max-width: 750px;
    border-radius: 8px;
    margin: 20px 0;
    border: 1px solid #30363d;
}

footer {
    text-align: center;
    padding: 25px 0;
    margin-top: 60px;
    background: #161b22;
    color: #8b949e;
    font-size: 14px;
    border-top: 1px solid #30363d;
}