:root {
    --danger-red: #ff0000;
    --dark-void: #050505;
    --font-main: 'Press Start 2P', cursive;
}

body {
    background-color: var(--dark-void);
    color: var(--danger-red);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
    /* 画面全体がわずかに揺れる */
    animation: shake 0.5s infinite;
}

/* 走査線エフェクト */
.monitor-flicker {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.25) 50%), 
                linear-gradient(90deg, rgba(255, 0, 0, 0.06), rgba(0, 255, 0, 0.02), rgba(0, 0, 255, 0.06));
    background-size: 100% 2px, 3px 100%;
    pointer-events: none;
    z-index: 10;
}

.login-box {
    border: 2px solid var(--danger-red);
    padding: 2rem;
    text-align: center;
    background: rgba(10, 0, 0, 0.9);
    box-shadow: 0 0 20px var(--danger-red);
    z-index: 5;
}

.warning-text {
    font-size: 1.5rem;
    margin: 0;
    text-shadow: 4px 0 blue, -4px 0 green; /* 色ずれエフェクト */
}

.sub-text {
    font-size: 0.6rem;
    margin-top: 10px;
    color: #888;
}

input {
    display: block;
    width: 100%;
    margin: 20px 0;
    background: black;
    border: 1px solid var(--danger-red);
    color: var(--danger-red);
    padding: 10px;
    font-family: var(--font-main);
    font-size: 0.8rem;
    box-sizing: border-box;
}

input:focus {
    background: #1a0000;
    outline: none;
}

.scary-button {
    background: var(--danger-red);
    color: black;
    border: none;
    padding: 10px 20px;
    font-family: var(--font-main);
    cursor: pointer;
    width: 100%;
    transition: 0.1s;
}

.scary-button:hover {
    background: white;
    box-shadow: 0 0 30px white;
}

.footer-msg {
    margin-top: 20px;
    font-size: 0.5rem;
    opacity: 0.5;
}

/* 揺れのアニメーション */
@keyframes shake {
    0% { transform: translate(1px, 1px); }
    10% { transform: translate(-1px, -2px); }
    20% { transform: translate(-3px, 0px); }
    100% { transform: translate(1px, 1px); }
}