.catalog-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: var(--card-background);
            backdrop-filter: blur(5px);
            z-index: 10000;
            align-items: center;
            justify-content: center;
        }
        
        .catalog-modal.show {
            display: flex;
        }
        
        .catalog-panel {
            background: var(--card-background);
            backdrop-filter: blur(10px);
            border-radius: 16px;
            padding: 25px;
            width: 80%;
            max-width: 400px;
            max-height: 70vh;
            overflow-y: auto;
            border: 1px solid var(--border);
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
        }
        
        .catalog-panel h3 {
            color: var(--text);
            margin: 0 0 20px 0;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
            font-size: 1.4em;
        }
        
        .catalog-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        
        .catalog-list li {
            margin-bottom: 10px;
        }
        
        .catalog-list a {
            display: block;
            padding: 12px 15px;
            color: var(--text);
            text-decoration: none;
            border-radius: 8px;
            transition: all 0.3s;
            background: var(--background);
            border: 1px solid transparent;
        }
        
        .catalog-list a:hover {
            background: var(--button-bg);
            color: white;
            transform: translateX(5px);
            border-color: var(--button-bg);
        }
        
        .catalog-list a.current {
            background: var(--button-bg);
            color: white;
            border-color: var(--button-bg);
            font-weight: 500;
        }
        
        .close-modal {
            display: block;
            width: 100%;
            padding: 12px;
            margin-top: 20px;
            background: var(--bg);
            color: var(--text);
            border: 1px solid var(--border);
            border-radius: 8px;
            cursor: pointer;
            font-size: 1em;
            transition: all 0.3s;
        }
        
        .close-modal:hover {
            background: var(--button-bg);
            color: white;
        }
        
        /* 加载状态 */
        .loading {
            text-align: center;
            padding: 50px;
            color: var(--text-light);
            font-size: 1.2em;
        }
        .chapter-nav {
    margin: 50px 0 50px 0;
    padding-top: 25px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;  /* 确保占满容器宽度 */
}

/* 三个子项都平均分宽度 */
.chapter-nav .prev-chapter,
.chapter-nav .catalog-link,
.chapter-nav .next-chapter {
    flex: 1;  /* 三等分关键！ */
    text-align: center;
    margin: 0;
    min-width: 0;  /* 防止内容溢出 */
}

/* 左边左对齐，右边右对齐 */
.chapter-nav .prev-chapter {
    text-align: left;
}

.chapter-nav .next-chapter {
    text-align: right;
}

/* 链接样式保持不变 */
.chapter-nav a {
    color: var(--button-bg);
    text-decoration: none;
    transition: 0.2s;
    padding: 5px 0;
    border-bottom: 1px solid transparent;
    display: inline-block;
}

.chapter-nav a:hover {
    color: var(--button-hover);
    border-bottom-color: var(--button-hover);
}

/* 没有链接时显示占位符 */
.chapter-nav .prev-chapter:empty::before,
.chapter-nav .next-chapter:empty::before {
    content: "—";
    color: var(--text-light);
    opacity: 0.3;
}

.pure-reader .article-content p {
    font-size: 18px;
    text-indent: 2em;
    line-height: 1.8em;
    user-select: none;
    -webkit-user-select: none;  /* Chrome/Safari */
    -moz-user-select: none;     /* Firefox */
    -ms-user-select: none;      /* IE/Edge */
}