body {
    margin: 0;
    background: #0b0f1a url("../img/bg-security.svg") no-repeat center;
    background-size: cover;
    color: #e6e6e6;
    font-family: "Segoe UI", sans-serif;
}
.header {
    display: flex;
    justify-content: space-between;
    padding: 20px 40px;
    background: rgba(10,15,30,0.8);
}
.logo span { color: #00f6ff; }
.login-btn {
    border: 1px solid #00f6ff;
    background: none;
    color: #00f6ff;
    padding: 8px 16px;
    border-radius: 6px;
    cursor: pointer;
}
.hero {
    text-align: center;
    margin-top: 120px;
}
.login-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.7);
}
.login-box {
    width: 320px;
    margin: 140px auto;
    background: #0f1528;
    padding: 30px;
    border-radius: 12px;
}