:root {
    --bg-color: #19191D;
    --panel-color: #202024;
    --text-primary: #E1E1E6;
    --text-secondary: #8D8D99;
    --border-color: rgba(255, 255, 255, 0.08);
    --accent-color: #00B37E;
    --accent-color-hover: #00A36E;
    --code-bg: #29292E;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    font-weight: 400;
    margin: 0;
    color: var(--text-primary);
    background-color: var(--bg-color);
    background-image: radial-gradient(var(--border-color) 1px, transparent 0);
    background-size: 30px 30px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    display: grid;
    grid-template-columns: 300px 1fr 300px;
    height: 100vh;
    gap: 1px;
    background-color: var(--border-color);
}

.column {
    padding: 35px;
    overflow-y: auto;
    background-color: var(--panel-color);
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

#release-list h2, #table-of-contents h2 {
    margin: 0 0 25px 0;
    padding-bottom: 15px;
    font-weight: 500;
    font-size: 1.1em;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
}

#version-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

#version-links li a {
    display: block;
    padding: 12px 20px;
    text-decoration: none;
    color: var(--text-secondary);
    border-radius: 6px;
    margin-bottom: 8px;
    font-weight: 500;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    left: 0;
}

#version-links li a:hover {
    color: var(--text-primary);
    background-color: var(--code-bg);
    left: 5px;
}

#version-links li a.active {
    color: #ffffff;
    font-weight: 700;
    background-color: var(--accent-color);
    box-shadow: 0 4px 15px -5px var(--accent-color);
}

#release-content {
    padding: 35px 50px;
}

#table-of-contents {
    font-size: 14px;
}

#toc-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

#toc-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 0;
    transition: all 0.2s ease;
    border-left: 2px solid transparent;
    padding-left: 18px;
}

#toc-links a:hover {
    color: var(--text-primary);
    border-left: 2px solid var(--accent-color-hover);
    padding-left: 22px;
}

/* Markdown content styles */
#content-body {
    opacity: 0;
}

#content-body > * {
    max-width: 720px;
}

#content-body h1, #content-body h2, #content-body h3, #content-body h4, #content-body h5, #content-body h6 {
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4em;
    margin-top: 1.8em;
    margin-bottom: 1em;
    letter-spacing: -0.02em;
}
#content-body h1 { font-size: 2.5em; font-weight: 900; }
#content-body h2 { font-size: 2em; font-weight: 700; }
#content-body h3 { font-size: 1.5em; font-weight: 500; }
#content-body h4 { font-size: 1.2em; font-weight: 500; }

#content-body a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s ease;
}

#content-body a:hover {
    color: var(--accent-color-hover);
    text-decoration: underline;
}

#content-body code {
    background-color: var(--code-bg);
    padding: 4px 8px;
    border-radius: 6px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    font-size: 0.9em;
}

#content-body pre {
    background-color: var(--code-bg);
    border: 1px solid var(--border-color);
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    box-shadow: 0 5px 20px -5px var(--shadow-color);
}

#content-body pre code {
    background-color: transparent;
    padding: 0;
}

#content-body blockquote {
    margin: 1.5em 0;
    padding-left: 20px;
    border-left: 3px solid var(--accent-color);
    color: var(--text-secondary);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--panel-color);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
    border: 2px solid var(--panel-color);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}