@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@900&display=swap');

/* 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: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--color-bg);
    color: var(--color-text);
    display: flex;
}
a:visited {
    color: var(--color-visited);
}
/* ---------- nav-panel ---------- */
.nav-panel {
    position: fixed;
    left: 0;
    top: 0;
    width: 220px;
    height: 100vh;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: 24px 20px;
    box-sizing: border-box;
    overflow-y: auto;
    z-index: 1000;
    transition: transform 0.3s ease;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
}
.nav-panel::-webkit-scrollbar { width: 4px; }
.nav-panel::-webkit-scrollbar-track { background: transparent; }
.nav-panel::-webkit-scrollbar-thumb { background: var(--color-scrollbar); border-radius: 2px; }
.nav-panel.collapsed {
    transform: translateX(-100%);
}
.nav-panel.collapsed .nav-content {
    display: none;
}
/* ---------- nav-panel toggle ---------- */
.sb-ctrl {
    position: fixed;
    left: 204px;
    top: 20px;
    z-index: 1001;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 32px;
    height: 32px;
    cursor: pointer;
    color: var(--color-text-subtle);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: left 0.3s ease, color 0.2s, background 0.2s, box-shadow 0.2s;
    padding: 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.sb-ctrl:hover {
    color: var(--color-sidebar-sublink-hover);
    background: var(--color-surface-hover);
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.nav-panel.collapsed + .sb-ctrl {
    left: 12px;
}
/* ---------- nav-panel inner ---------- */
.nav-panel h2 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-subtle);
    margin: 0 0 20px 0;
    font-weight: 600;
}
.nav-panel a {
    display: block;
    color: var(--color-sidebar-link);
    text-decoration: none;
    padding: 6px 0;
    font-size: 14px;
    transition: color 0.2s;
}
.nav-panel a:hover {
    color: var(--color-sidebar-link-hover);
}
.nav-panel .comic-list > a {
    font-weight: 500;
    cursor: pointer;
}
.nav-panel .comic-list .sublist {
    margin-left: 12px;
    padding-left: 12px;
    border-left: 1px solid var(--color-border-light);
}
.nav-panel .comic-list .sublist a {
    font-size: 13px;
    color: var(--color-sidebar-sublink);
}
.nav-panel .comic-list .sublist a:hover {
    color: var(--color-sidebar-sublink-hover);
}
/* ---------- content ---------- */
.content {
    margin-left: 220px;
    padding: 0;
    flex: 1;
    box-sizing: border-box;
    transition: margin-left 0.3s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--color-bar-bg);
}
.nav-panel.collapsed ~ .content {
    margin-left: 0;
}
header {
    color: var(--color-bar-text);
    padding: 1rem 1rem 2rem;
}
header h1 {
    margin: 0;
    padding-left: 3rem;
    font-family: 'Noto Sans SC', sans-serif;
    font-weight: 900;
}
/* keeping top nav styles in case they are used elsewhere */
nav a {
    color: var(--color-nav-link);
    text-decoration: none;
    margin: 0 0.5rem;
}
nav a:hover {
    color: var(--color-bar-text);
}
main {
    flex: 1;
    background: var(--color-bg);
    border-radius: 16px;
    position: relative;
    z-index: 1;
}
footer {
    text-align: center;
    padding: 2rem 1rem 1rem;
    color: var(--color-bar-text);
}
.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) 2rem var(--markdown-bottom-margin, 1rem) 2rem;
    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 var(--color-border-medium);
    padding: 0.5rem;
    background: var(--color-surface);
    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 */