/* ==========================================================================
   知序 · 课程详情页（阅读工作台）
   与 site.css 同一套设计变量与语言；正文排版直接复用 site.css 的 .prose
   （模板给正文容器同时挂了 .markdown-body.prose 两个类）
   ========================================================================== */

/* ---------------------------------------------------------------- 进度条 */

.page-curriculum .reading-progress {
    position: fixed;
    left: 0;
    right: 0;
    top: 64px;
    z-index: 55;
    height: 2px;
    pointer-events: none;
}
.page-curriculum #readingProgressBar {
    width: 0;
    height: 100%;
    background: var(--accent);
    transition: width .1s linear;
}

/* ------------------------------------------------------------ 三栏骨架 */

.page-curriculum .page-layout {
    display: flex;
    align-items: flex-start;
    min-height: calc(100vh - 64px);
}

.page-curriculum .sidebar {
    position: sticky;
    top: 64px;
    width: 300px;
    height: calc(100vh - 64px);
    flex-shrink: 0;
    overflow-y: auto;
    border-right: 1px solid var(--line);
    background: var(--surface);
}

.page-curriculum .main-content {
    flex: 1 1 auto;
    width: auto;
    max-width: 1000px;
    min-width: 0;
    margin: 0 auto;
    padding: 34px 40px 80px;
}

.page-curriculum .right-toc {
    position: sticky;
    top: 64px;
    width: 236px;
    height: calc(100vh - 64px);
    flex-shrink: 0;
    overflow-y: auto;
    padding: 34px 22px 32px 0;
    display: none;
}

/* -------------------------------------------------------- 侧栏：课程信息 */

.page-curriculum .sidebar-header {
    padding: 22px 18px 18px;
    border-bottom: 1px solid var(--line);
}
.page-curriculum .sidebar-header h2 {
    margin: 10px 0 0;
    font-family: var(--serif);
    font-size: 1.04rem;
    line-height: 1.45;
}
.page-curriculum .course-back {
    display: inline-flex;
    color: var(--muted);
    font-size: .78rem;
    font-weight: 600;
}
.page-curriculum .course-back:hover { color: var(--accent); }

.page-curriculum .directory-search-wrap { position: relative; margin-top: 14px; }
.page-curriculum .directory-search {
    width: 100%;
    height: 36px;
    padding: 0 46px 0 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    outline: none;
    background: var(--surface-2);
    color: var(--ink);
    font-size: .82rem;
    transition: .18s ease;
}
.page-curriculum .directory-search:focus { border-color: var(--accent); background: var(--surface); }
.page-curriculum .search-count {
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    color: var(--muted);
    font-size: .7rem;
}

.page-curriculum .btn-new-dir {
    width: 100%;
    min-height: 34px;
    margin-top: 10px;
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--muted);
    font-size: .8rem;
    font-weight: 600;
    cursor: pointer;
    transition: .18s ease;
}
.page-curriculum .btn-new-dir:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ---------------------------------------------------- 侧栏：目录树 */

.page-curriculum .chapter-list { padding: 10px 12px 26px; }

.page-curriculum .dir-group { margin: 2px 0; }
.page-curriculum .dir-group-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: .15s ease;
}
.page-curriculum .dir-group-header:hover,
.page-curriculum .dir-group-header.active { background: var(--accent-soft); }

.page-curriculum .dir-icon {
    display: grid;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    place-items: center;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: var(--surface-2);
    color: var(--accent);
    font-size: .68rem;
    font-weight: 700;
}
.page-curriculum .dir-group-header.active .dir-icon { border-color: var(--accent); background: var(--accent); color: #fff; }
.page-curriculum .dir-name {
    flex: 1;
    overflow: hidden;
    font-size: .84rem;
    font-weight: 600;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.page-curriculum .dir-count { color: var(--muted); font-size: .7rem; }
.page-curriculum .dir-arrow { color: var(--muted); font-size: .62rem; transition: transform .2s; }
.page-curriculum .dir-group-header.expanded .dir-arrow { transform: rotate(90deg); }

.page-curriculum .dir-new-article {
    display: inline-flex;
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    border-radius: 5px;
    background: var(--surface);
    color: var(--muted);
    font-size: .85rem;
    font-weight: 700;
}
.page-curriculum .dir-new-article:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }

.page-curriculum .dir-group-body { display: none; padding: 2px 0 6px; }
.page-curriculum .dir-group-body.show { display: block; }

.page-curriculum .dir-article-item {
    display: flex;
    align-items: baseline;
    gap: 9px;
    margin: 1px 0;
    padding: 8px 10px 8px 34px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: .15s ease;
}
.page-curriculum .dir-article-item:hover { background: var(--surface-2); }
.page-curriculum .dir-article-item.active { background: var(--accent-soft); box-shadow: inset 2px 0 var(--accent); }
.page-curriculum .dir-article-item.active .dir-article-title { color: var(--accent-2); font-weight: 600; }
.page-curriculum .dir-article-num {
    flex: 0 0 auto;
    font-family: var(--serif);
    color: var(--muted);
    font-size: .74rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
}
.page-curriculum .dir-article-item.active .dir-article-num { color: var(--accent); }
.page-curriculum .dir-article-title {
    overflow: hidden;
    color: var(--ink-2);
    font-size: .8rem;
    line-height: 1.5;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* -------------------------------------------------------- 右侧小节目录 */

.page-curriculum .right-toc .toc-group-title {
    padding: 0 0 8px 12px;
    color: var(--muted);
    font-size: .7rem;
    font-weight: 700;
    letter-spacing: .16em;
    text-transform: uppercase;
}
.page-curriculum .right-toc .toc-tree { border-left: 1px solid var(--line); }
.page-curriculum .right-toc .toc-item {
    display: block;
    margin-left: -1px;
    padding: 5px 10px 5px 12px;
    border-left: 2px solid transparent;
    color: var(--muted);
    font-size: .78rem;
    line-height: 1.5;
}
.page-curriculum .right-toc .toc-item:hover { color: var(--ink); }
.page-curriculum .right-toc .toc-item.active { border-left-color: var(--accent); color: var(--accent); font-weight: 600; }
.page-curriculum .right-toc .toc-item.toc-h2 { padding-left: 22px; }
.page-curriculum .right-toc .toc-item.toc-h3 { padding-left: 34px; font-size: .75rem; }
.page-curriculum .right-toc .toc-item.toc-h4 { padding-left: 46px; font-size: .75rem; }

/* ---------------------------------------------------------------- 正文区 */

.page-curriculum .welcome-message,
.page-curriculum .pending-card {
    padding: 64px 36px;
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius-lg);
    color: var(--muted);
    font-size: .92rem;
    text-align: center;
}
.page-curriculum .pending-card .spinner {
    width: 32px;
    height: 32px;
    margin: 0 auto 14px;
    border: 2px solid var(--line);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: page-spin .8s linear infinite;
}
@keyframes page-spin { to { transform: rotate(360deg); } }

.page-curriculum .article-card {
    padding: clamp(30px, 4vw, 54px);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
}
.page-curriculum .article-card .article-header {
    position: relative;
    margin-bottom: 6px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--line);
}
.page-curriculum .article-card h1 {
    margin: 0;
    padding-right: 72px;
    font-size: clamp(1.6rem, 3.4vw, 2.1rem);
    line-height: 1.3;
}
.page-curriculum .article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    margin-top: 12px;
    color: var(--muted);
    font-size: .78rem;
}
.page-curriculum .edit-btn {
    position: absolute;
    top: 0;
    right: 0;
    padding: 5px 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--muted);
    font-size: .78rem;
    font-weight: 600;
}
.page-curriculum .edit-btn:hover { border-color: var(--accent); color: var(--accent); }

/* 正文容器复用 site.css 的 .prose，这里只做课程页的尺寸微调 */
.page-curriculum .prose { max-width: 820px; padding-top: 26px; margin: 0 auto; }

/* Excalidraw 源图入口：保留「点这里去改源图」的提示块外观 */
.page-curriculum .prose blockquote:has(a[href$=".excalidraw"]),
.page-curriculum .prose blockquote:has(a[href^="/excalidraw/edit"]) {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: .7rem 0 1.8rem;
    padding: 10px 14px;
    border: 1px dashed var(--line-strong);
    border-left: 3px solid var(--accent);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    font-size: .88rem;
}
.page-curriculum .prose blockquote:has(a[href$=".excalidraw"]) p,
.page-curriculum .prose blockquote:has(a[href^="/excalidraw/edit"]) p { margin: 0; }

/* 代码块右上角的复制按钮 */
.page-curriculum .prose pre { position: relative; }
.page-curriculum .prose pre .code-copy {
    position: absolute;
    top: 8px;
    right: 8px;
    display: inline-flex;
    width: 28px;
    height: 28px;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: #8b949e;
    cursor: pointer;
    opacity: 0;
    transition: opacity .15s, background .15s, color .15s;
}
.page-curriculum .prose pre:hover .code-copy { opacity: 1; }
.page-curriculum .prose pre .code-copy:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.page-curriculum .prose pre .code-copy.copied { color: #3fb950; }
.page-curriculum .prose pre .code-copy svg { width: 15px; height: 15px; }

/* ------------------------------------------------------------ 上一/下一章 */

.page-curriculum .chapter-nav {
    display: flex;
    gap: 14px;
    margin-top: 44px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
}
.page-curriculum .chapter-nav .nav-card {
    display: flex;
    flex: 1;
    min-height: 74px;
    max-width: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 14px 16px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--ink-2);
    transition: .2s ease;
}
.page-curriculum .chapter-nav .nav-card.next { align-items: flex-end; text-align: right; }
.page-curriculum .chapter-nav .nav-card:hover { border-color: var(--accent); color: var(--ink); box-shadow: var(--shadow); }
.page-curriculum .chapter-nav .nav-label {
    color: var(--muted);
    font-size: .7rem;
    font-weight: 700;
    letter-spacing: .1em;
}
.page-curriculum .chapter-nav .nav-title {
    color: var(--ink);
    font-family: var(--serif);
    font-size: .96rem;
    font-weight: 600;
    line-height: 1.4;
}
.page-curriculum .chapter-complete {
    display: grid;
    flex: 1;
    min-height: 74px;
    padding: 14px 16px;
    place-items: center;
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius);
    color: var(--muted);
    font-size: .82rem;
    text-align: center;
}

/* ---------------------------------------------------------------- 弹窗 */

.page-curriculum .modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
    background: rgba(15, 17, 19, .55);
}
.page-curriculum .modal-card {
    width: min(460px, calc(100% - 32px));
    padding: 26px;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    background: var(--surface);
    box-shadow: var(--shadow-lift);
}
.page-curriculum .modal-card h3 { margin: 0 0 14px; font-size: 1.1rem; }
.page-curriculum .modal-card .hint { margin: 0 0 12px; color: var(--muted); font-size: .85rem; line-height: 1.7; }
.page-curriculum .modal-card input[type="text"] {
    width: 100%;
    height: 40px;
    padding: 0 13px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    outline: none;
    background: var(--surface-2);
    color: var(--ink);
    font-size: .92rem;
}
.page-curriculum .modal-card input[type="text"]:focus { border-color: var(--accent); background: var(--surface); }
.page-curriculum .modal-card .status { margin-top: 8px; color: var(--muted); font-size: .82rem; }
.page-curriculum .modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

.page-curriculum .modal-drop {
    padding: 32px 18px;
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius);
    cursor: pointer;
    text-align: center;
    transition: .18s ease;
}
.page-curriculum .modal-drop:hover { border-color: var(--accent); background: var(--accent-soft); }
.page-curriculum .modal-drop .t { color: var(--muted); font-size: .88rem; }
.page-curriculum .modal-drop .s { margin-top: 4px; color: var(--muted); font-size: .76rem; }

.page-curriculum .file-info {
    display: none;
    align-items: center;
    gap: 8px;
    margin-top: 12px;
    padding: 10px 13px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--surface-2);
    color: var(--ink-2);
    font-size: .85rem;
}
.page-curriculum .file-info .fname { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.page-curriculum .file-info .rm { cursor: pointer; color: var(--mark); font-weight: 700; }

/* -------------------------------------------------------------- 响应式 */

@media (max-width: 1280px) {
    .page-curriculum .right-toc { display: none !important; }
}

@media (max-width: 980px) {
    .page-curriculum .page-layout { display: block; }
    .page-curriculum .sidebar {
        position: static;
        width: auto;
        height: auto;
        max-height: none;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }
    .page-curriculum .main-content { padding: 22px 20px 60px; }
    .page-curriculum .reading-progress { top: 58px; }
    .page-curriculum .chapter-nav { flex-direction: column; }
}


/* ==========================================================================
   两个弹窗（新建目录 / 上传 Markdown）的 DOM 上带着历史内联样式，
   这里用 !important 统一到新主题，避免为改外观去重写那段含 HTML 实体的标记。
   ========================================================================== */

.page-curriculum .upload-overlay { background: rgba(15, 17, 19, .55) !important; }
.page-curriculum .upload-overlay > div {
    border: 1px solid var(--line) !important;
    border-radius: var(--radius-lg) !important;
    background: var(--surface) !important;
    box-shadow: var(--shadow-lift) !important;
}
.page-curriculum .upload-overlay h3 { color: var(--ink) !important; }
.page-curriculum .upload-overlay p { color: var(--muted) !important; }
.page-curriculum .upload-overlay input[type="text"] {
    border: 1px solid var(--line) !important;
    border-radius: var(--radius-sm) !important;
    background: var(--surface-2) !important;
    color: var(--ink) !important;
}
.page-curriculum .upload-overlay input[type="text"]:focus { border-color: var(--accent) !important; }
.page-curriculum .upload-overlay button {
    min-height: 38px !important;
    padding: 0 20px !important;
    border: 1px solid var(--line-strong) !important;
    border-radius: var(--radius-sm) !important;
    background: var(--surface) !important;
    color: var(--ink-2) !important;
    font-size: .88rem !important;
    font-weight: 600 !important;
}
.page-curriculum .upload-overlay button:hover { border-color: var(--accent) !important; color: var(--accent) !important; }
.page-curriculum #newDirBtn,
.page-curriculum #uploadSubmitBtn {
    border-color: transparent !important;
    background: var(--accent) !important;
    color: #fff !important;
}
.page-curriculum #newDirBtn:hover,
.page-curriculum #uploadSubmitBtn:hover { background: var(--accent-2) !important; color: #fff !important; }
.page-curriculum #uploadDrop { border: 2px dashed var(--line-strong) !important; border-radius: var(--radius) !important; }
.page-curriculum #uploadDrop:hover { border-color: var(--accent) !important; background: var(--accent-soft) !important; }
.page-curriculum #uploadFileInfo {
    border: 1px solid var(--line) !important;
    border-radius: var(--radius-sm) !important;
    background: var(--surface-2) !important;
    color: var(--ink-2) !important;
}

/* ==========================================================================
   只有一个目录的课程：不显示「文件夹」这一层，左侧直接平铺文章列表
   （保留 .dir-group / .dir-group-body 结构，搜索与高亮逻辑仍可复用）
   ========================================================================== */

.page-curriculum .dir-group--single::before {
    content: "文章目录";
    display: block;
    padding: 0 10px 10px;
    color: var(--muted);
    font-size: .7rem;
    font-weight: 700;
    letter-spacing: .16em;
}
.page-curriculum .dir-group--single .dir-group-header { display: none; }
.page-curriculum .dir-group--single .dir-group-body { display: block; }
.page-curriculum .dir-group--single .dir-article-item { padding-left: 10px; }
.page-curriculum .dir-empty { padding: 8px 12px; color: var(--muted); font-size: .8rem; }