@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@500&display=swap');

body {
    margin: 0;
    padding: 0;
    font-family: 'Orbitron', monospace, Arial, sans-serif;
    background: linear-gradient(135deg, #0f2027, #203a43, #2c5364);
    color: #eee;
    min-height: 100vh;
}

header {
    background: rgba(10, 10, 10, 0.85);
    padding: 25px 40px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

header h1 {
    font-weight: 700;
    font-size: 2.4rem;
    color: #00ffea;
    text-shadow: 0 0 8px #00fff7;
    margin: 0;
}

nav a {
    color: #00ffea;
    margin-left: 25px;
    font-weight: 600;
    text-decoration: none;
    position: relative;
    transition: color 0.3s ease;
}

nav a::after {
    content: '';
    position: absolute;
    width: 0%;
    height: 2px;
    bottom: -6px;
    left: 0;
    background: #00fff7;
    transition: width 0.3s ease;
}

nav a:hover {
    color: #ffffff;
}

nav a:hover::after {
    width: 100%;
}

main {
    max-width: 900px;
    margin: 60px auto 80px;
    padding: 40px 35px;
    background: rgba(15, 30, 40, 0.85);
    border-radius: 12px;
    box-shadow: 0 0 25px #00fff7aa;
    text-align: center;
}

main h2 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    text-shadow: 0 0 10px #00fff7cc;
}

main p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 22px;
    color: #cde9f2;
}

footer {
    background: rgba(10, 10, 10, 0.85);
    text-align: center;
    padding: 18px 0;
    font-size: 0.9rem;
    color: #00ffea;
    box-shadow: inset 0 1px 3px #00fff7;
    position: fixed;
    bottom: 0;
    width: 100%;
}

/* 响应式适配 */
@media (max-width: 600px) {
    header {
        flex-direction: column;
        padding: 20px;
    }
    nav {
        margin-top: 15px;
    }
    main {
        margin: 40px 20px 70px;
        padding: 30px 20px;
    }
}