/* ════════════════════════════════════════════════
   Article Feature Styles
   — Fixed TOC Sidebar, Lightbox, Copy Button, Comments
   ════════════════════════════════════════════════ */

/* ── 固定侧边目录 TOC ───────────────────── */
/* 在所有内容之前，固定在视口左侧 */
.article-toc-wrapper {
    position: fixed;
    left: 0;
    top: 0;
    width: 200px;
    height: 100vh;
    overflow-y: auto;
    padding: 5rem 1rem 2rem 1.5rem;
    z-index: 50;
    background-color: var(--secondary-color);
    border-right: 1px solid var(--border-color);
    backdrop-filter: none;
}

.article-toc {
    font-size: 0.82rem;
}

.toc-header {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.6rem;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.toc-body {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.toc-link {
    color: var(--accent-color);
    text-decoration: none;
    display: block;
    padding: 2px 0;
    line-height: 1.5;
    transition: color 0.15s;
    border-bottom: none !important;
}

.toc-link:hover {
    color: var(--primary-color);
}

.toc-h3 {
    padding-left: 0.75rem;
    font-size: 0.78rem;
}

/* 有侧边栏时：容器偏移200px，但仍居中对齐剩余空间 */
.article-toc-wrapper + .container {
    margin-left: 220px;
    /* 计算居中：(剩余宽度 - 容器宽度) / 2 + 220px 偏移 */
    margin-left: max(220px, calc((100vw - 800px) / 2 + 220px));
    margin-right: auto;
}

/* 桌面端隐藏切换按钮 */
.toc-toggle-btn,
.toc-overlay {
    display: none;
}

/* ── 小屏：悬浮按钮呼出 TOC ──────────────── */
@media (max-width: 960px) {
    .article-toc-wrapper {
        display: none;
    }

    .article-toc-wrapper.mobile-open {
        display: block;
        position: fixed;
        left: 0;
        top: 0;
        width: 260px;
        height: 100vh;
        padding: 5rem 1rem 2rem 1.5rem;
        background: var(--secondary-color);
        border-right: 1px solid var(--border-color);
        z-index: 200;
        overflow-y: auto;
        box-shadow: 4px 0 20px rgba(0,0,0,0.15);
    }

    /* 悬浮按钮 */
    .toc-toggle-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        position: fixed;
        left: 0.75rem;
        bottom: 1.5rem;
        width: 44px;
        height: 44px;
        border-radius: 50%;
        background: var(--primary-color);
        color: #fff;
        border: none;
        font-size: 1.1rem;
        cursor: pointer;
        z-index: 150;
        box-shadow: 0 2px 12px rgba(0,0,0,0.25);
        transition: transform 0.15s, opacity 0.15s;
    }

    .toc-toggle-btn:hover {
        transform: scale(1.05);
    }

    .toc-toggle-btn:active {
        transform: scale(0.95);
    }

    .toc-overlay {
        display: none;
    }

    .toc-overlay.active {
        display: block;
        position: fixed;
        left: 0;
        top: 0;
        width: 100vw;
        height: 100vh;
        background: rgba(0, 0, 0, 0.4);
        z-index: 199;
    }

    .article-toc-wrapper + .container {
        margin-left: 0;
    }

    .article-toc {
        border-left: none;
        padding-left: 0;
    }

    .toc-body {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 0.3rem 1rem;
    }

    .toc-link {
        display: inline-block;
        white-space: nowrap;
    }

    .toc-h3 {
        padding-left: 0;
    }
}

/* ── Lightbox ─────────────────────────────── */
.lightbox-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    cursor: zoom-out;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.lightbox-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-overlay img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 6px;
    box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: transform 0.25s ease;
}

.lightbox-overlay.active img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    background: none;
    border: none;
    opacity: 0.7;
    transition: opacity 0.15s;
}

.lightbox-close:hover {
    opacity: 1;
}

.project-content img {
    cursor: zoom-in;
}

/* ── 代码块复制按钮 ───────────────────────── */
.code-block-wrapper {
    position: relative;
    margin: inherit;
}

/* 保持原有 pre 样式不受 wrapper 影响 */
.code-block-wrapper pre {
    margin: 0 !important;
}

/* 兼容 div.code-block 包裹的旧格式代码块 */
.code-block-wrapper .code-block {
    margin: 0;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    padding: 4px 10px;
    font-size: 0.75rem;
    background: var(--bg-hover);
    color: var(--accent-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background 0.15s;
    line-height: 1.4;
    z-index: 2;
}

.code-block-wrapper:hover .copy-btn {
    opacity: 1;
}

.copy-btn:hover {
    background: var(--primary-color);
    color: #fff;
}

.copy-btn.copied {
    background: #4caf50;
    color: #fff;
    border-color: #4caf50;
}

/* ── 评论系统 ─────────────────────────────── */
.comments-section {
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.comments-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.comments-title i {
    margin-right: 0.4rem;
}

.comment-form {
    margin-bottom: 1.5rem;
}

.comment-form textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--secondary-color);
    color: var(--primary-color);
    font-size: 0.9rem;
    resize: vertical;
    min-height: 80px;
    font-family: inherit;
    transition: border-color 0.15s;
}

.comment-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.comment-form-row {
    display: flex;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.comment-form input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--secondary-color);
    color: var(--primary-color);
    font-size: 0.85rem;
    font-family: inherit;
}

.comment-form input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.comment-submit {
    padding: 0.5rem 1.25rem;
    background: var(--primary-color);
    color: var(--secondary-color);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    white-space: nowrap;
    transition: opacity 0.15s;
}

.comment-submit:hover {
    opacity: 0.85;
}

.comment-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.comment-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.comment-item {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--secondary-color);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.4rem;
    font-size: 0.82rem;
}

.comment-author {
    font-weight: 600;
    color: var(--primary-color);
}

.comment-time {
    color: var(--accent-color);
    font-size: 0.78rem;
}

.comment-body {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--primary-color);
}

.comment-empty {
    text-align: center;
    color: var(--accent-color);
    padding: 2rem 0;
    font-size: 0.9rem;
}