/* ============================================================================
   博客前台样式 —— 与考试系统共用同一套设计变量，视觉上是同一家族
   ============================================================================ */

:root {
  --brand: #4f46e5;
  --brand-dark: #4338ca;
  --brand-light: #eef2ff;
  --accent: #0ea5e9;
  --ok: #16a34a;
  --warn: #f59e0b;
  --danger: #e11d48;
  --ink: #0f172a;
  --ink-2: #475569;
  --ink-3: #94a3b8;
  --line: #e2e8f0;
  --bg: #f6f7fb;
  --card: #ffffff;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px -12px rgba(15, 23, 42, .18);
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --maxw: 1180px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 16px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  word-wrap: break-word;
}
a { color: var(--brand-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

/* ------------------------------------------------------------ 布局 */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.layout {
  display: grid; grid-template-columns: 230px minmax(0, 1fr) 250px;
  gap: 28px; align-items: start; padding: 26px 0 60px;
}
@media (max-width: 1080px) {
  .layout { grid-template-columns: 200px minmax(0, 1fr); }
  .widgets { display: none; }
}
@media (max-width: 760px) {
  .layout { grid-template-columns: minmax(0, 1fr); gap: 18px; padding-top: 14px; }
  .sidebar { position: static !important; }
}

/* ------------------------------------------------------------ 侧栏 */
.sidebar { position: sticky; top: 22px; }
.sidebar header { margin-bottom: 18px; }
.avatar-row { display: flex; align-items: center; gap: 12px; }
.avatar {
  width: 56px; height: 56px; border-radius: 50%; flex: none; object-fit: cover;
  background: linear-gradient(135deg, var(--brand), #7c3aed); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; font-weight: 700; box-shadow: var(--shadow-sm);
}
.site-name { font-size: 19px; font-weight: 800; margin: 0 0 2px; letter-spacing: -.01em; }
.site-name a { color: var(--ink); }
.site-desc { font-size: 13px; color: var(--ink-2); margin: 0; line-height: 1.55; }

.menu { list-style: none; margin: 18px 0 0; padding: 0; }
.menu a {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 12px; border-radius: var(--radius-sm); color: var(--ink-2);
  font-size: 14.5px; font-weight: 600; transition: background .15s, color .15s;
}
.menu a:hover { background: #fff; color: var(--brand-dark); text-decoration: none; }
.menu a.current { background: var(--brand-light); color: var(--brand-dark); }
.menu .ico { width: 17px; text-align: center; opacity: .8; }
.sidebar-foot { margin-top: 22px; padding-top: 14px; border-top: 1px solid var(--line); font-size: 12px; color: var(--ink-3); }

/* ------------------------------------------------------------ 卡片 */
.card {
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow-sm);
  padding: 20px 22px; margin-bottom: 16px;
}
.card-link:hover { box-shadow: var(--shadow); border-color: #cbd5e1; }
.card-link { display: block; text-decoration: none; transition: box-shadow .18s, border-color .18s; }
.card-link:hover { text-decoration: none; }

.tag-pill {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  background: var(--brand-light); color: var(--brand-dark);
  font-size: 12px; font-weight: 700; margin: 0 6px 6px 0;
}
.card h2 { font-size: 21px; margin: 8px 0 8px; line-height: 1.4; letter-spacing: -.01em; }
.card h2 a { color: var(--ink); }
.card h2 a:hover { color: var(--brand-dark); }
.card .sum { color: var(--ink-2); font-size: 14.5px; margin: 0 0 12px; }
.meta { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; font-size: 12.5px; color: var(--ink-3); }
.meta .pin { color: var(--warn); font-weight: 700; }

/* ------------------------------------------------------------ 文章页 */
.article { padding: 26px 30px; }
.article h1 { font-size: 28px; line-height: 1.35; margin: 6px 0 14px; letter-spacing: -.02em; }
.article-body { font-size: 16.5px; line-height: 1.85; color: #1e293b; }
.article-body > *:first-child { margin-top: 0; }
.article-body h2 {
  font-size: 21px; margin: 34px 0 12px; padding-left: 12px;
  border-left: 4px solid var(--brand); line-height: 1.4;
}
.article-body h3 { font-size: 17.5px; margin: 26px 0 10px; color: var(--ink); }
.article-body h4 { font-size: 16px; margin: 20px 0 8px; color: var(--ink-2); }
.article-body p { margin: 0 0 16px; }
.article-body ul, .article-body ol { margin: 0 0 16px; padding-left: 24px; }
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  margin: 0 0 16px; padding: 14px 18px; border-left: 4px solid var(--accent);
  background: #f0f9ff; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: #0c4a6e;
}
.article-body blockquote p:last-child { margin-bottom: 0; }
.article-body code {
  font-family: var(--mono); font-size: .9em; background: #f1f5f9;
  padding: 2px 6px; border-radius: 5px; color: #be185d;
}
.article-body pre.code-block {
  background: #0f172a; color: #e2e8f0; padding: 16px 18px; border-radius: var(--radius-sm);
  overflow-x: auto; margin: 0 0 16px; position: relative;
}
.article-body pre.code-block code { background: none; color: inherit; padding: 0; font-size: 13.5px; line-height: 1.7; }
.article-body pre.code-block[data-lang]::before {
  content: attr(data-lang); position: absolute; top: 8px; right: 12px;
  font-size: 11px; color: #64748b; font-family: var(--mono); text-transform: uppercase;
}
.article-body hr { border: none; border-top: 1px solid var(--line); margin: 28px 0; }
.article-body a { border-bottom: 1px solid #c7d2fe; }
.table-wrap { overflow-x: auto; margin: 0 0 16px; }
.article-body table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
.article-body th { background: #f8fafc; font-weight: 700; }
.article-body img { border-radius: var(--radius-sm); margin: 6px 0; }

.article-foot { margin-top: 30px; padding-top: 18px; border-top: 1px solid var(--line); }
.license { font-size: 12.5px; color: var(--ink-3); margin-top: 14px; }
.prevnext { display: flex; gap: 12px; margin-top: 18px; }
.prevnext a {
  flex: 1; padding: 12px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: #fff; font-size: 13.5px; color: var(--ink-2);
}
.prevnext a:hover { border-color: var(--brand); color: var(--brand-dark); text-decoration: none; }
.prevnext .lbl { display: block; font-size: 11px; color: var(--ink-3); margin-bottom: 3px; }

/* ------------------------------------------------------------ 小组件 */
.widget { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 16px; }
.widget h3 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); margin: 0 0 12px; }
.widget ul { list-style: none; margin: 0; padding: 0; }
.widget li { margin-bottom: 9px; font-size: 14px; }
.widget li a { color: var(--ink-2); display: flex; justify-content: space-between; gap: 8px; }
.widget li a:hover { color: var(--brand-dark); }
.widget .n { color: var(--ink-3); font-size: 12.5px; flex: none; }
.search-box { display: flex; gap: 8px; }
.search-box input {
  flex: 1; min-width: 0; padding: 9px 12px; border: 1px solid var(--line);
  border-radius: var(--radius-sm); font-size: 14px; font-family: inherit;
}
.search-box input:focus { outline: 2px solid var(--brand-light); border-color: var(--brand); }
.search-box button {
  padding: 9px 14px; border: none; border-radius: var(--radius-sm); background: var(--brand);
  color: #fff; font-weight: 700; cursor: pointer; font-family: inherit; font-size: 14px;
}
.search-box button:hover { background: var(--brand-dark); }

/* ------------------------------------------------------------ 页头 */
.topbar { background: #fff; border-bottom: 1px solid var(--line); }
.topbar-in { max-width: var(--maxw); margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; gap: 12px; }
.topbar .brand { font-weight: 800; font-size: 16px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.topbar .brand .dot {
  width: 26px; height: 26px; border-radius: 8px; background: linear-gradient(135deg, var(--brand), #7c3aed);
  color: #fff; display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.topbar .sp { flex: 1; }
.topbar .lnk { font-size: 13.5px; color: var(--ink-2); font-weight: 600; }

/* ------------------------------------------------------------ 空状态 / 分页 */
.empty { text-align: center; padding: 60px 20px; color: var(--ink-3); }
.empty .big { font-size: 40px; margin-bottom: 10px; }
.pager { display: flex; justify-content: center; gap: 8px; margin: 26px 0 0; }
.pager a, .pager span {
  padding: 8px 14px; border: 1px solid var(--line); border-radius: var(--radius-sm);
  background: #fff; font-size: 14px; color: var(--ink-2);
}
.pager .on { background: var(--brand); border-color: var(--brand); color: #fff; font-weight: 700; }
.pager a:hover { border-color: var(--brand); text-decoration: none; color: var(--brand-dark); }

/* ------------------------------------------------------------ 页脚 */
.site-foot { border-top: 1px solid var(--line); background: #fff; padding: 22px 0; margin-top: 20px; }
.site-foot .in { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; display: flex; flex-wrap: wrap; gap: 12px; align-items: center; font-size: 12.5px; color: var(--ink-3); }
.site-foot .sp { flex: 1; }

/* 搜索高亮 */
mark { background: #fef08a; padding: 0 2px; border-radius: 3px; }