:root {
    --bg-color: #0d0b14;
    --sidebar-bg: #15121e;
    --content-bg: #1a1625;
    --accent: #b388ff;
    --text-main: #e0e0e0;
    --text-dim: #9e9e9e;
    --code-bg: #2d2438;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', 'Noto Sans JP', sans-serif;
    margin: 0;
    display: flex;
    min-height: 100vh;
}

/* Sidebar Navigation */
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid rgba(179, 136, 255, 0.1);
    padding: 2rem 1.5rem;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.sidebar h2 {
    font-size: 1.2rem;
    color: var(--accent);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
}

.sidebar li {
    margin-bottom: 0.8rem;
}

.sidebar a {
    color: var(--text-dim);
    text-decoration: none;
    transition: color 0.3s;
    font-size: 0.95rem;
}

.sidebar a:hover,
.sidebar a.active {
    color: var(--accent);
}

/* Main Content Area */
.main-content {
    flex: 1;
    padding: 4rem 10% 8rem;
    max-width: 900px;
}

.doc-article {
    background: var(--content-bg);
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    line-height: 1.8;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--accent);
    padding-bottom: 0.5rem;
}

h2 {
    font-size: 1.8rem;
    margin-top: 3rem;
    margin-bottom: 1.2rem;
    color: var(--accent);
}

h3 {
    font-size: 1.3rem;
    margin-top: 2rem;
    color: #fff;
}

p {
    margin-bottom: 1.2rem;
}

code {
    background: var(--code-bg);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-family: 'Cascadia Code', monospace;
    font-size: 0.9em;
}

.info-box {
    background: rgba(179, 136, 255, 0.1);
    border-left: 4px solid var(--accent);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
}

footer {
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-dim);
    font-size: 0.85rem;
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--accent);
    text-decoration: none;
}

@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
    }

    .main-content {
        padding: 2rem 5%;
    }
}