:root {
    --bg-color: #121212;
    --primary-color: #1e1e1e;
    --secondary-color: #2a2a2a;
    --font-color: #e0e0e0;
    --accent-color: #03dac6;
    --accent-hover: #018786;
    --github-color: #333;
    --github-hover: #444;
}

body {
    font-family: 'Noto Sans JP', 'Source Code Pro', sans-serif;
    background-color: var(--bg-color);
    color: var(--font-color);
    line-height: 1.8;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    width: 100%;
    background-color: var(--primary-color);
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s forwards ease-out;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1, h2, h3 {
    color: var(--accent-color);
    border-left: 4px solid var(--accent-color);
    padding-left: 15px;
    margin-top: 40px;
}

h1 {
    text-align: center;
    border-left: none;
    padding-left: 0;
    margin-top: 0;
    margin-bottom: 20px;
}

p {
    margin-bottom: 20px;
}

.code-block {
    background-color: var(--secondary-color);
    border-radius: 8px;
    padding: 20px;
    overflow-x: auto;
    border: 1px solid #444;
}

pre {
    color: #f1f1f1;
    white-space: pre-wrap;
    word-wrap: break-word;
    margin: 0;
    font-family: 'Source Code Pro', monospace; 
    font-size: 0.95em;
    line-height: 1.6;
}

#copy-button {
    display: block;
    width: 100%;
    margin-top: 15px;
    background-color: var(--accent-color);
    color: #000;
    border: none;
    padding: 12px 22px;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1.1em;
    text-align: center;
    transition: background-color 0.3s, transform 0.2s;
}

#copy-button:hover {
    background-color: var(--accent-hover);
    transform: scale(1.01);
}

#copy-button:active {
    transform: scale(0.99);
}

.platform-tabs {
    display: flex;
    border-bottom: 1px solid #444;
    margin-bottom: 20px;
}

.tab-button {
    padding: 10px 20px;
    cursor: pointer;
    background-color: transparent;
    border: none;
    color: var(--font-color);
    font-size: 1em;
    border-bottom: 3px solid transparent;
    transition: all 0.3s;
}

.tab-button.active {
    color: var(--accent-color);
    border-bottom: 3px solid var(--accent-color);
}

.instructions {
    display: none;
}

.instructions.active {
    display: block;
    animation: slideIn 0.5s forwards ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(10px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

ol, ul {
    background-color: var(--secondary-color);
    padding: 20px 20px 20px 40px;
    border-radius: 8px;
    border: 1px solid #444;
}

li {
    margin-bottom: 15px;
}

.highlight {
    color: var(--accent-color);
    font-weight: 700;
}

.note {
    font-style: italic;
    color: #aaa;
    background-color: var(--secondary-color);
    padding: 10px;
    border-left: 3px solid #666;
    border-radius: 4px;
}

.github-button {
    display: inline-block;
    padding: 12px 25px;
    background-color: var(--github-color);
    color: #fff;
    text-decoration: none;
    border-radius: 5px;
    font-weight: bold;
    text-align: center;
    transition: background-color 0.3s, transform 0.2s;
    border: 1px solid #555;
}

.github-button:hover {
    background-color: var(--github-hover);
    transform: scale(1.02);
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    .platform-tabs {
        flex-direction: column;
    }
    .tab-button {
        width: 100%;
        text-align: left;
    }
}