/* Learn-Python 静态站 · 课程页样式 */

/* ---------- 顶栏 ---------- */
.lhead {
  max-width: 1180px; margin: 0 auto; padding: 28px 20px 18px;
  border-bottom: 1px solid var(--border);
}
.lhead .back { font-size: .86rem; color: var(--muted); }
.lhead h1 { font-size: 1.7rem; margin: 12px 0 12px; letter-spacing: -.01em; }
.lmeta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.lmeta .badge { font-size: .76rem; padding: 2px 9px; border-radius: 999px;
                 border: 1px solid var(--border); color: var(--muted); }
.lmeta .pills { display: flex; flex-wrap: wrap; gap: 6px; margin-left: 4px; }
.pill-link {
  font-size: .76rem; padding: 2px 10px; border-radius: 999px;
  border: 1px solid var(--accent); color: var(--accent); text-decoration: none;
}
.pill-link:hover { background: var(--accent); color: #fff; text-decoration: none; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 10px; top: 10px; background: var(--panel); padding: 8px 12px;
              border-radius: 6px; z-index: 99; }

/* ---------- 布局：侧栏 TOC + 正文 ---------- */
.lwrap {
  max-width: 1180px; margin: 0 auto; padding: 28px 20px 40px;
  display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 36px; align-items: start;
}
@media (max-width: 900px) { .lwrap { grid-template-columns: 1fr; gap: 0; } .toc { display: none; } }

.toc { position: sticky; top: 20px; max-height: calc(100vh - 40px); overflow-y: auto;
       font-size: .85rem; border-right: 1px solid var(--border); padding-right: 14px; }
.toc-h { font-weight: 600; margin-bottom: 10px; color: var(--fg); }
.toc a { display: block; color: var(--muted); text-decoration: none;
         padding: 4px 0; line-height: 1.45; }
.toc a:hover { color: var(--accent); }
.toc a.toc-l2 { font-weight: 600; color: var(--fg); margin-top: 8px; }
.toc a.toc-l3 { padding-left: 12px; }

.lbody { min-width: 0; line-height: 1.78; }
.lbody h1 { display: none; }            /* 标题已在 lhead 显示 */
.lbody h2 { font-size: 1.35rem; margin: 38px 0 14px; padding-bottom: 7px;
            border-bottom: 1px solid var(--border); }
.lbody h3 { font-size: 1.08rem; margin: 28px 0 10px; }
.lbody h4 { font-size: .98rem; margin: 22px 0 8px; color: var(--muted); }
.lbody p { margin: 12px 0; }
.lbody ul, .lbody ol { padding-left: 26px; }
.lbody li { margin: 5px 0; }
.lbody blockquote {
  margin: 16px 0; padding: 10px 16px; border-left: 3px solid var(--accent);
  background: var(--panel); border-radius: 0 8px 8px 0; color: var(--muted);
}
.lbody hr { border: 0; border-top: 1px solid var(--border); margin: 32px 0; }
.lbody img { max-width: 100%; }

/* ---------- 表格 ---------- */
.lbody table {
  border-collapse: collapse; width: 100%; margin: 18px 0; font-size: .9rem;
  display: block; overflow-x: auto;              /* 窄屏可横向滚动，不撑破布局 */
}
.lbody th, .lbody td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.lbody th { background: var(--panel); font-weight: 600; white-space: nowrap; }
.lbody tr:nth-child(even) td { background: color-mix(in srgb, var(--panel) 50%, transparent); }

/* ---------- 代码 ---------- */
.lbody code {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 4px; padding: 1px 5px; font-size: .87em;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}
.lbody pre {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 8px; padding: 14px 16px; overflow-x: auto; margin: 16px 0;
}
.lbody pre code { background: none; border: 0; padding: 0; font-size: .86rem; line-height: 1.6; }

.codeblock { margin: 16px 0; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.cb-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 5px 12px; background: color-mix(in srgb, var(--panel) 70%, #000 8%);
  border-bottom: 1px solid var(--border); font-size: .74rem; color: var(--muted);
}
.cb-lang { letter-spacing: .04em; text-transform: uppercase; }
.cb-head .copy {
  background: transparent; border: 1px solid var(--border); color: var(--muted);
  border-radius: 5px; padding: 1px 9px; font-size: .72rem; cursor: pointer;
}
.cb-head .copy:hover { color: var(--accent); border-color: var(--accent); }
.codeblock pre { margin: 0; border: 0; border-radius: 0; }

/* ASCII 图：必须原样，绝不换行、绝不高亮 */
pre.plain {
  white-space: pre; overflow-x: auto; font-size: .82rem; line-height: 1.35;
  background: color-mix(in srgb, var(--panel) 80%, #000 6%);
}

/* pygments 高亮（跟随主题） */
.hl-pre .k, .hl-pre .kd, .hl-pre .kn { color: #ff7b72; }
.hl-pre .s, .hl-pre .s1, .hl-pre .s2, .hl-pre .sb, .hl-pre .sd { color: #a5d6ff; }
.hl-pre .c, .hl-pre .c1, .hl-pre .cm, .hl-pre .ch { color: #8b949e; font-style: italic; }
.hl-pre .nf, .hl-pre .fm { color: #d2a8ff; }
.hl-pre .nc, .hl-pre .nn { color: #7ee787; }
.hl-pre .mi, .hl-pre .mf, .hl-pre .il { color: #79c0ff; }
.hl-pre .nb, .hl-pre .bp { color: #ffa657; }
.hl-pre .o, .hl-pre .ow { color: #ff7b72; }
.hl-pre .p { color: #8b949e; }
.hl-pre .err { color: #ffa198; background: none; }
@media (prefers-color-scheme: light) {
  .hl-pre .k, .hl-pre .kd, .hl-pre .kn, .hl-pre .o, .hl-pre .ow { color: #cf222e; }
  .hl-pre .s, .hl-pre .s1, .hl-pre .s2, .hl-pre .sb, .hl-pre .sd { color: #0a3069; }
  .hl-pre .c, .hl-pre .c1, .hl-pre .cm, .hl-pre .ch { color: #6e7781; }
  .hl-pre .nf, .hl-pre .fm { color: #8250df; }
  .hl-pre .nc, .hl-pre .nn { color: #116329; }
  .hl-pre .mi, .hl-pre .mf, .hl-pre .il { color: #0550ae; }
  .hl-pre .nb, .hl-pre .bp { color: #953800; }
}

/* ---------- mermaid ---------- */
.mermaid-wrap { margin: 20px 0; border: 1px solid var(--border); border-radius: 8px;
                background: var(--panel); padding: 16px; position: relative; }
.mermaid { text-align: center; overflow-x: auto; }
.mermaid svg { max-width: 100%; height: auto; }
.mermaid-raw { position: absolute; top: 8px; right: 8px; font-size: .7rem;
               background: transparent; border: 1px solid var(--border);
               color: var(--muted); border-radius: 5px; padding: 1px 8px; cursor: pointer; }
.mermaid-src { display: none; margin: 12px 0 0; font-size: .78rem; white-space: pre; }
.mermaid-wrap.show-raw .mermaid-src { display: block; }
.mermaid-wrap.show-raw .mermaid { display: none; }

/* ---------- details / summary（仓库里大量使用） ---------- */
.lbody details { margin: 14px 0; border: 1px solid var(--border);
                 border-radius: 8px; background: var(--panel); padding: 10px 14px; }
.lbody summary { cursor: pointer; font-weight: 600; }
.lbody summary::marker { color: var(--muted); }

/* ---------- 上下页 ---------- */
.pager {
  max-width: 1180px; margin: 0 auto; padding: 22px 20px 56px;
  border-top: 1px solid var(--border); display: flex; justify-content: space-between; gap: 16px;
}
.pager a { font-size: .9rem; }
.pager .disabled { color: var(--todo); font-size: .9rem; }
@media (max-width: 700px) { .pager { flex-direction: column; } }