*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #020204;
    overflow: hidden;
    font-family: 'Helvetica Neue', 'Hiragino Sans', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}

.container {
    text-align: center;
    max-width: 500px;
    padding: 2rem;
}

.error-code {
    font-size: clamp(4rem, 15vw, 10rem);
    font-weight: 100;
    color: rgba(255, 255, 255, 0.04);
    line-height: 1;
    letter-spacing: 0.1em;
    user-select: none;
}

.lines {
    margin-top: 3rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.line {
    font-size: 0.85rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0);
    font-weight: 300;
    letter-spacing: 0.03em;
    transition: color 3s ease;
}

.line.visible {
    color: rgba(255, 255, 255, 0.6);
}

.line em {
    font-style: normal;
    color: rgba(255, 255, 255, 0.9);
}

.cursor {
    display: inline-block;
    width: 1px;
    height: 1em;
    background: rgba(255, 255, 255, 0.3);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: blink 1.2s step-end infinite;
}

@keyframes blink {
    50% { opacity: 0; }
}