/* 图片保护 */
img {
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-user-drag: none;
}
.comic-viewer img {
    pointer-events: none;
}

/* layout and base styles */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
    display: flex;
}
.sidebar {
    width: 200px;
    background-color: #eee;
    padding: 1rem;
    box-sizing: border-box;
    height: 100vh;
    position: fixed;
    overflow-y: auto;
    transition: width 0.3s ease;
}
.sidebar.collapsed {
    width: 40px;
}
.sidebar.collapsed .nav-content {
    display: none;
}
.sidebar-toggle {
    position: absolute;
    right: 5px;
    top: 5px;
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
}
.sidebar h2 {
    margin-top: 0;
}
.sidebar a {
    display: block;
    color: #333;
    text-decoration: none;
    padding: 0.25rem 0;
}
.sidebar a:hover {
    background-color: #ddd;
}
.sidebar .comic-list > a {
    font-weight: bold;
    cursor: pointer;
}
.sidebar .comic-list .sublist {
    margin-left: 1rem;
}
.sidebar .comic-list .sublist a {
    font-size: 0.9rem;
}
.content {
    margin-left: 220px;
    padding: 1rem;
    flex: 1;
    box-sizing: border-box;
    transition: margin-left 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}
.content.sidebar-collapsed {
    margin-left: 60px;
}
header {
    background-color: #444;
    color: white;
    padding: 1rem;
}
/* keeping top nav styles in case they are used elsewhere */
nav a {
    color: #ddd;
    text-decoration: none;
    margin: 0 0.5rem;
}
nav a:hover {
    color: white;
}
main {
    padding: 1rem;
    flex: 1;
}
footer {
    text-align: center;
    padding: 1rem;
    background-color: #444;
    color: white;
}
.comic-viewer {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh; /* 填满视口高度 */
    margin-top: 0; /* 移除顶部边距，因为 header 固定 */
    width: 100%; /* 宽度扩展至父容器 */
}

.comic-viewer .pages {
    display: flex;
    height: 100%;
    gap: 0; /* 移除间隙，让图片紧贴 */
    width: 100%; /* 保证页面容器始终占满可用宽度 */
}

/* 新增 scroll-snap 和 markdown 区域样式 */
main#mainContent {
    scroll-snap-type: y mandatory;
    overflow-y: auto;
    height: 100vh;
}
#mainContent > div {
    scroll-snap-align: start;
    min-height: 100vh; /* 确保每个区块至少占满视口 */
}

.markdown-stage {
    padding: var(--markdown-top-margin, 1rem) 1rem var(--markdown-bottom-margin, 1rem) 1rem;
    max-width: 800px;
    margin: 0 auto;
    box-sizing: border-box;
    overflow-y: auto;
    min-height: 100vh; /* 确保至少占满视口高度 */
}

#preface, #afterword {
    /* 允许内容超出时内部滚动 */
    max-height: 100vh;
}

/* overview cards */
.comic-overview {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}
.comic-card {
    width: 200px;
    border: 1px solid #ccc;
    padding: 0.5rem;
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.comic-card img {
    width: 100%;
    height: auto;
}
.comic-card h3 {
    margin: 0.5rem 0 0.25rem;
}
.comic-card p {
    font-size: 0.9rem;
}
.comic-viewer .pages {
    display: flex;
    height: 100%;
    gap: 0; /* 移除间隙，让图片紧贴 */
    width: 100%; /* 保证页面容器始终占满可用宽度 */
}
.comic-viewer img {
    width: 50%; /* 各占一半宽度 */
    height: 100%; /* 填满高度 */
    object-fit: contain; /* 保持比例，不裁剪 */
    border: none; /* 移除边框 */
}
/* 移除按钮样式，因为不再需要 */