body {
        margin: 0;
        padding: 0;
        background-color: #000;
        color: Lime;
        font-family: "Courier New", Courier, monospace;
        line-height: 1.6;
    }

    .container {
        max-width: 1200px;
        margin: 40px auto;
        padding: 20px;
        border: 1px solid #00ff00;
        box-shadow: 0 0 15px #00ff00;
    }

    h1, h2 {
        text-align: center;
        text-transform: uppercase;
        letter-spacing: 2px;
        color: Lime;
    }

    h1 {
        margin-bottom: 10px;
    }

    .subtitle {
        text-align: center;
        font-size: 0.9em;
        opacity: 0.8;
        margin-bottom: 30px;
    }

    .info {
        border-left: 3px solid #00ff00;
        padding-left: 15px;
        margin-bottom: 30px;
    }

    ol {
        counter-reset: step;
        padding-left: 0;
    }

    ol li {
        list-style: none;
        margin-bottom: 15px;
        padding: 10px;
        border: 1px dashed #00ff00;
    }

    ol li::before {
        counter-increment: step;
        content: "STEP " counter(step) " : ";
        font-weight: bold;
    }

    .credits {
        margin-top: 30px;
        padding: 15px;
        background: rgba(0, 255, 0, 0.05);
        border: 1px solid #00ff00;
        text-align: center;
        font-weight: bold;
    }

    .video {
        margin-top: 40px;
        text-align: center;
    }

    iframe {
        width: 100%;
        height: 500px;
        border: 1px solid #00ff00;
        box-shadow: 0 0 10px #00ff00;
    }

    .note {
        margin-top: 15px;
        font-size: 0.85em;
        opacity: 0.8;
    }

    .blink {
        animation: blink 1.2s infinite;
    }

    @keyframes blink {
        50% { opacity: 0; }
    }
    
    body {
    margin: 0;
    font-family: "Courier New", Courier, monospace;
    background: #0d0f12;
    color: Lime;
}

/* center page */
.container {
    max-width: 900px;
    margin: 20px auto;
    text-align: center;
}

/* title */
h1 {
    font-size: 42px;
    margin-bottom: 5px;
    color: lime;
}

.subtitle {
    color: #888;
    margin-bottom: 40px;
}

/* grid layout */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

/* cards */
.card {
    display: flex;

    justify-content: center;   /* horizontal */
    align-items: center;       /* vertical */

    padding: 30px;
    background: #161a20;
    border-radius: 8px;
    text-decoration: none;
    color: white;
    font-size: 18px;

    text-align: center;        /* multiline safety */

    transition: 0.15s;
}

.card:hover {
    background: #222833;
    transform: translateY(-3px);
}

pre {
    max-width: 100%;       /* never wider than parent */
    box-sizing: border-box; /* include padding in width */
    overflow-x: auto;       /* horizontal scroll if too wide */
    white-space: pre-wrap;  /* wrap lines if possible */
    word-break: break-word; /* break long words or URLs */
}

.code-block {
    background: #111;
    color: #7fd1ff;
    font-family: Consolas, monospace;
    padding: 15px;
    border-radius: 6px;

    max-width: 100%;           /* fit parent */
    box-sizing: border-box;

    overflow: hidden;           /* hide scrollbars */
    white-space: pre-wrap;      /* wrap lines */
    word-wrap: break-word;      /* break long words (older browsers) */
    word-break: break-word;     /* break long words (modern browsers) */
    line-height: 1.4;
}

a {
    color: #00ff00; /* lime */
}

a:visited {
    color: #00cc00; /* darker lime */
}