/* web学习笔记 —— 站点样式 */
:root {
  --brand: #2b5cff;
  --brand-d: #1e46d6;
  --brand-l: #eef2ff;
  --ink: #101828;
  --ink-2: #344054;
  --ink-3: #667085;
  --ink-4: #98a2b3;
  --line: #e6e9f0;
  --bg: #f6f7fb;
  --card: #fff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px -12px rgba(16, 24, 40, .12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15.5px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 22px; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.bar { display: flex; align-items: center; gap: 26px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo {
  width: 30px; height: 30px; border-radius: 8px; display: grid; place-items: center;
  background: linear-gradient(135deg, #2b5cff, #5b8bff); color: #fff;
  font: 700 16px/1 ui-monospace, SFMono-Regular, Menlo, monospace;
  box-shadow: 0 4px 10px -4px rgba(43, 92, 255, .7);
}
.logo.sm { width: 24px; height: 24px; font-size: 13px; border-radius: 7px; }
.bt { display: flex; flex-direction: column; line-height: 1.25; }
.bt b { font-size: 15.5px; letter-spacing: .2px; }
.bt i { font-style: normal; font-size: 11.5px; color: var(--ink-4); }
.nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav a {
  padding: 7px 12px; border-radius: 8px; font-size: 14px; color: var(--ink-2);
  transition: .16s;
}
.nav a:hover { background: #f2f4f9; color: var(--ink); }
.nav a.on { color: var(--brand); background: var(--brand-l); font-weight: 600; }
.menu-btn {
  display: none; margin-left: auto; background: #fff; border: 1px solid var(--line);
  border-radius: 8px; width: 36px; height: 34px; font-size: 16px; cursor: pointer;
}

/* ---------- 首页 hero ---------- */
.hero {
  background:
    radial-gradient(900px 300px at 12% -10%, #dfe7ff 0%, rgba(223, 231, 255, 0) 62%),
    radial-gradient(700px 260px at 88% 0%, #e8f4ff 0%, rgba(232, 244, 255, 0) 60%),
    #fbfcff;
  border-bottom: 1px solid var(--line);
}
.hero-in { padding: 66px 0 58px; max-width: 780px; }
.eyebrow {
  display: inline-block; margin: 0 0 14px; padding: 4px 12px; border-radius: 999px;
  background: #fff; border: 1px solid #dbe3ff; color: var(--brand);
  font-size: 12px; font-weight: 600; letter-spacing: .6px;
}
.hero h1 {
  margin: 0 0 18px; font-size: 42px; line-height: 1.28; letter-spacing: -1px;
  font-weight: 800;
}
.lede { margin: 0; color: var(--ink-3); font-size: 15.5px; line-height: 1.9; }
.hero-stat { display: flex; gap: 40px; margin-top: 30px; }
.hero-stat div { display: flex; align-items: baseline; gap: 7px; }
.hero-stat b { font-size: 24px; font-weight: 800; letter-spacing: -.5px; }
.hero-stat span { color: var(--ink-4); font-size: 13px; }

/* ---------- 区块 ---------- */
.sec { padding: 44px 22px; }
.sec-h {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 16px;
}
.sec-h h2 { margin: 0; font-size: 20px; letter-spacing: -.3px; }
.sec-h h2::before {
  content: ""; display: inline-block; width: 4px; height: 17px; border-radius: 2px;
  background: var(--brand); margin-right: 10px; vertical-align: -2px;
}
.more { font-size: 13px; color: var(--ink-3); }
.more:hover { color: var(--brand); }

/* 文章列表 */
.list {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow);
}
.row {
  display: flex; align-items: flex-start; gap: 18px; padding: 17px 22px;
  border-bottom: 1px solid #f0f2f7; transition: .15s;
}
.row:last-child { border-bottom: 0; }
.row:hover { background: #fafbff; }
.rdate {
  flex: 0 0 48px; font: 500 12.5px/1.9 ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--ink-4); padding-top: 2px;
}
.rmain { flex: 1; min-width: 0; }
.rtitle { font-size: 15.5px; font-weight: 600; letter-spacing: -.1px; }
.row:hover .rtitle { color: var(--brand); }
.rsum {
  margin-top: 3px; font-size: 13.2px; color: var(--ink-3); line-height: 1.65;
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical;
}
.rtag {
  flex: 0 0 auto; font-size: 12px; color: var(--ink-3); background: #f4f6fa;
  border-radius: 999px; padding: 3px 11px; margin-top: 2px;
}

/* 栏目卡片 */
.cgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.ccard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; transition: .18s; box-shadow: 0 1px 2px rgba(16, 24, 40, .03);
}
.ccard:hover {
  border-color: #c7d4ff; transform: translateY(-2px);
  box-shadow: 0 12px 28px -18px rgba(43, 92, 255, .6);
}
.cicon {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: var(--brand-l); color: var(--brand); font-size: 19px; margin-bottom: 13px;
}
.cicon.sm { display: inline-grid; width: 30px; height: 30px; font-size: 15px; margin: 0 10px 0 0; vertical-align: 3px; }
.ccard h3 { margin: 0 0 7px; font-size: 16.5px; }
.ccard p { margin: 0 0 14px; font-size: 13.2px; color: var(--ink-3); line-height: 1.7; min-height: 44px; }
.cnum { font-size: 12.5px; color: var(--brand); font-weight: 600; }

/* 精选 */
.pgrid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.pcard {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; transition: .18s;
}
.pcard:hover { border-color: #c7d4ff; transform: translateY(-2px); }
.ptag {
  display: inline-block; font-size: 11.5px; color: var(--brand); background: var(--brand-l);
  padding: 2px 9px; border-radius: 999px; margin-bottom: 10px;
}
.pcard h3 { margin: 0 0 8px; font-size: 15.5px; line-height: 1.55; }
.pcard p {
  margin: 0 0 14px; font-size: 13px; color: var(--ink-3); line-height: 1.7;
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
}
.pmeta { font-size: 12px; color: var(--ink-4); }

.note-band {
  display: flex; align-items: center; gap: 26px; justify-content: space-between;
  background: linear-gradient(120deg, #eef2ff, #f7f9ff 55%, #eef6ff);
  border: 1px solid #dfe6ff; border-radius: var(--radius); padding: 26px 28px;
}
.note-band h3 { margin: 0 0 6px; font-size: 16px; }
.note-band p { margin: 0; font-size: 13.5px; color: var(--ink-3); line-height: 1.8; max-width: 640px; }
.btn {
  display: inline-block; background: var(--brand); color: #fff; font-size: 13.5px;
  font-weight: 600; padding: 9px 20px; border-radius: 9px; white-space: nowrap;
  transition: .16s; box-shadow: 0 6px 14px -8px rgba(43, 92, 255, .9);
}
.btn:hover { background: var(--brand-d); }

/* ---------- 栏目页 / 归档 ---------- */
.cathero {
  background: linear-gradient(180deg, #fbfcff, #f6f7fb);
  border-bottom: 1px solid var(--line); padding: 34px 0 30px;
}
.cathero h1 { margin: 8px 0 10px; font-size: 30px; letter-spacing: -.6px; }
.cathero p { margin: 0; color: var(--ink-3); font-size: 14.5px; max-width: 720px; }
.cmeta { margin-top: 12px; font-size: 12.5px; color: var(--ink-4); }
.crumb { font-size: 12.5px; color: var(--ink-4); }
.crumb a:hover { color: var(--brand); }

.ablock { margin-bottom: 26px; }
.ablock h2 {
  margin: 0 0 10px; font-size: 17px; display: flex; align-items: baseline; gap: 10px;
}
.ablock h2 small { font-size: 12px; color: var(--ink-4); font-weight: 400; }
.alist {
  list-style: none; margin: 0; padding: 0; background: #fff;
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
}
.alist li {
  display: flex; justify-content: space-between; gap: 16px; padding: 12px 20px;
  border-bottom: 1px solid #f2f4f8; font-size: 14.5px;
}
.alist li:last-child { border-bottom: 0; }
.alist li a:hover { color: var(--brand); }
.alist li span {
  font: 400 12.5px/1.9 ui-monospace, Menlo, monospace; color: var(--ink-4); flex-shrink: 0;
}

/* ---------- 文章页 ---------- */
.article {
  display: grid; grid-template-columns: minmax(0, 1fr) 232px; gap: 40px;
  padding-top: 30px; padding-bottom: 56px; align-items: start;
}
.artmain {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 40px 30px; box-shadow: var(--shadow); min-width: 0;
}
.artmain h1 {
  margin: 14px 0 14px; font-size: 30px; line-height: 1.35; letter-spacing: -.7px;
}
.ameta {
  display: flex; flex-wrap: wrap; gap: 14px; padding-bottom: 18px;
  border-bottom: 1px solid #eef0f5; font-size: 12.5px; color: var(--ink-4);
}
.ameta a { color: var(--brand); }
.content { padding-top: 22px; font-size: 15.5px; color: var(--ink-2); line-height: 1.92; }
.content > :first-child { margin-top: 0; }
.content h2 {
  margin: 34px 0 12px; font-size: 20px; color: var(--ink); letter-spacing: -.3px;
  padding-left: 12px; border-left: 4px solid var(--brand); line-height: 1.45;
}
.content h3 { margin: 24px 0 10px; font-size: 16.5px; color: var(--ink); }
.content p { margin: 0 0 15px; }
.content ul, .content ol { margin: 0 0 16px; padding-left: 24px; }
.content li { margin: 5px 0; }
.content li::marker { color: var(--brand); }
.content blockquote {
  margin: 18px 0; padding: 12px 18px; background: #f7f9fc;
  border-left: 3px solid #c7d4ff; border-radius: 0 8px 8px 0; color: var(--ink-3);
  font-size: 14.5px;
}
.content blockquote p:last-child { margin-bottom: 0; }
.content code {
  font: 13.2px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: #f1f3f9; color: #b4237a; padding: 1.5px 5px; border-radius: 4px;
}
.content pre {
  margin: 0; padding: 16px 18px; overflow: auto;
  background: #1e222b; border-radius: 10px;
}
.content pre code {
  background: none; color: #e6e9ef; padding: 0; font-size: 13px; line-height: 1.72;
}
.codebox { position: relative; margin: 18px 0; }
.codebox .copy {
  position: absolute; top: 8px; right: 8px; opacity: 0; transition: .15s;
  background: rgba(255, 255, 255, .12); color: #cbd5e1; border: 0; border-radius: 6px;
  font-size: 11.5px; padding: 3px 9px; cursor: pointer;
}
.codebox:hover .copy { opacity: 1; }
.content table {
  width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 14px;
}
.content th, .content td { border: 1px solid var(--line); padding: 9px 12px; text-align: left; }
.content th { background: #f7f9fc; font-weight: 600; }
.content hr { border: 0; border-top: 1px solid var(--line); margin: 26px 0; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; }
.chip {
  font-size: 12px; color: var(--ink-3); background: #f4f6fa; border: 1px solid #eef0f5;
  padding: 3px 10px; border-radius: 999px;
}
.pnav {
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px;
  margin-top: 30px; padding-top: 22px; border-top: 1px solid #eef0f5;
}
.pn {
  display: flex; flex-direction: column; gap: 3px; padding: 12px 15px;
  border: 1px solid var(--line); border-radius: 10px; transition: .16s;
}
.pn:hover { border-color: #c7d4ff; background: #fafbff; }
.pn span { font-size: 11.5px; color: var(--ink-4); }
.pn b { font-size: 13.5px; font-weight: 600; line-height: 1.5; }
.pn.r { text-align: right; }

.side { position: sticky; top: 80px; }
.tocbox {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; font-size: 13px;
}
.tocbox b { display: block; margin-bottom: 8px; font-size: 12.5px; color: var(--ink-3); }
.tocbox .toc > ul { list-style: none; margin: 0; padding: 0; }
.tocbox ul ul { list-style: none; padding-left: 12px; margin: 4px 0; }
.tocbox li { margin: 6px 0; line-height: 1.55; }
.tocbox a { color: var(--ink-3); display: block; }
.tocbox a:hover { color: var(--brand); }

/* ---------- 关于 ---------- */
.about {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 34px 40px; box-shadow: var(--shadow); max-width: 860px;
}
.about h2 {
  margin: 26px 0 10px; font-size: 19px; padding-left: 12px; border-left: 4px solid var(--brand);
}
.about h2:first-child { margin-top: 0; }
.about p { margin: 0 0 14px; color: var(--ink-2); line-height: 1.9; font-size: 15px; }
.about .note-band { margin-top: 26px; display: block; }

/* ---------- 页脚 ---------- */
.foot { background: #fff; border-top: 1px solid var(--line); margin-top: 20px; }
.fin {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 30px;
  padding: 34px 22px 26px;
}
.fbrand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 15px; margin-bottom: 9px; }
.fcol p { margin: 0; font-size: 12.8px; color: var(--ink-3); line-height: 1.8; max-width: 400px; }
.fcol.links { display: flex; flex-direction: column; gap: 7px; }
.fcol.links b { font-size: 12.5px; color: var(--ink-2); margin-bottom: 3px; }
.fcol.links a { font-size: 12.8px; color: var(--ink-3); }
.fcol.links a:hover { color: var(--brand); }
.copy {
  display: flex; flex-wrap: wrap; gap: 6px 22px; justify-content: center; align-items: center;
  text-align: center;
  padding: 14px 22px 22px; border-top: 1px solid #f0f2f7; font-size: 12.5px; color: var(--ink-4);
}
.beian { display: inline-flex; align-items: center; gap: 2px; }
.icp { color: var(--ink-3); }
.icp:hover { color: var(--brand); text-decoration: underline; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .article { grid-template-columns: 1fr; gap: 22px; }
  .side { display: none; }
  .cgrid, .pgrid { grid-template-columns: repeat(2, 1fr); }
  .fin { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 34px; }
}
@media (max-width: 720px) {
  .menu-btn { display: block; }
  .nav {
    position: absolute; left: 0; right: 0; top: 62px; flex-direction: column;
    align-items: stretch; gap: 2px; background: #fff; border-bottom: 1px solid var(--line);
    padding: 10px 16px 16px; display: none;
  }
  .nav.open { display: flex; }
  .nav a { padding: 9px 12px; }
  .hero-in { padding: 44px 0 40px; }
  .hero h1 { font-size: 27px; }
  .hero-stat { gap: 24px; }
  .cgrid, .pgrid { grid-template-columns: 1fr; }
  .cgrid .ccard p { min-height: 0; }
  .artmain { padding: 24px 20px 22px; }
  .artmain h1 { font-size: 23px; }
  .content { font-size: 15px; }
  .content h2 { font-size: 18px; }
  .note-band { flex-direction: column; align-items: flex-start; gap: 14px; }
  .fin { grid-template-columns: 1fr; gap: 22px; }
  .row { padding: 14px 16px; gap: 12px; }
  .rdate { flex-basis: 40px; }
  .seed { display: none; }
  .about { padding: 24px 20px; }
}

/* pygments */
pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.codehilite .hll { background-color: #49483e }
.codehilite { background: #272822; color: #F8F8F2 }
.codehilite .c { color: #959077 } /* Comment */
.codehilite .err { color: #ED007E; background-color: #1E0010 } /* Error */
.codehilite .esc { color: #F8F8F2 } /* Escape */
.codehilite .g { color: #F8F8F2 } /* Generic */
.codehilite .k { color: #66D9EF } /* Keyword */
.codehilite .l { color: #AE81FF } /* Literal */
.codehilite .n { color: #F8F8F2 } /* Name */
.codehilite .o { color: #FF4689 } /* Operator */
.codehilite .x { color: #F8F8F2 } /* Other */
.codehilite .p { color: #F8F8F2 } /* Punctuation */
.codehilite .ch { color: #959077 } /* Comment.Hashbang */
.codehilite .cm { color: #959077 } /* Comment.Multiline */
.codehilite .cp { color: #959077 } /* Comment.Preproc */
.codehilite .cpf { color: #959077 } /* Comment.PreprocFile */
.codehilite .c1 { color: #959077 } /* Comment.Single */
.codehilite .cs { color: #959077 } /* Comment.Special */
.codehilite .gd { color: #FF4689 } /* Generic.Deleted */
.codehilite .ge { color: #F8F8F2; font-style: italic } /* Generic.Emph */
.codehilite .ges { color: #F8F8F2; font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.codehilite .gr { color: #FF4689 } /* Generic.Error */
.codehilite .gh { color: #F8F8F2 } /* Generic.Heading */
.codehilite .gi { color: #A6E22E } /* Generic.Inserted */
.codehilite .go { color: #66D9EF } /* Generic.Output */
.codehilite .gp { color: #FF4689; font-weight: bold } /* Generic.Prompt */
.codehilite .gs { color: #F8F8F2; font-weight: bold } /* Generic.Strong */
.codehilite .gu { color: #959077 } /* Generic.Subheading */
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.codehilite .kc { color: #66D9EF } /* Keyword.Constant */
.codehilite .kd { color: #66D9EF } /* Keyword.Declaration */
.codehilite .kn { color: #FF4689 } /* Keyword.Namespace */
.codehilite .kp { color: #66D9EF } /* Keyword.Pseudo */
.codehilite .kr { color: #66D9EF } /* Keyword.Reserved */
.codehilite .kt { color: #66D9EF } /* Keyword.Type */
.codehilite .ld { color: #E6DB74 } /* Literal.Date */
.codehilite .m { color: #AE81FF } /* Literal.Number */
.codehilite .s { color: #E6DB74 } /* Literal.String */
.codehilite .na { color: #A6E22E } /* Name.Attribute */
.codehilite .nb { color: #A6E22E } /* Name.Builtin */
.codehilite .nc { color: #A6E22E } /* Name.Class */
.codehilite .no { color: #66D9EF } /* Name.Constant */
.codehilite .nd { color: #A6E22E } /* Name.Decorator */
.codehilite .ni { color: #F8F8F2 } /* Name.Entity */
.codehilite .ne { color: #A6E22E } /* Name.Exception */
.codehilite .nf { color: #A6E22E } /* Name.Function */
.codehilite .nl { color: #F8F8F2 } /* Name.Label */
.codehilite .nn { color: #F8F8F2 } /* Name.Namespace */
.codehilite .nx { color: #A6E22E } /* Name.Other */
.codehilite .py { color: #F8F8F2 } /* Name.Property */
.codehilite .nt { color: #FF4689 } /* Name.Tag */
.codehilite .nv { color: #F8F8F2 } /* Name.Variable */
.codehilite .ow { color: #FF4689 } /* Operator.Word */
.codehilite .pm { color: #F8F8F2 } /* Punctuation.Marker */
.codehilite .w { color: #F8F8F2 } /* Text.Whitespace */
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.codehilite .mf { color: #AE81FF } /* Literal.Number.Float */
.codehilite .mh { color: #AE81FF } /* Literal.Number.Hex */
.codehilite .mi { color: #AE81FF } /* Literal.Number.Integer */
.codehilite .mo { color: #AE81FF } /* Literal.Number.Oct */
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.codehilite .sc { color: #E6DB74 } /* Literal.String.Char */
.codehilite .dl { color: #E6DB74 } /* Literal.String.Delimiter */
.codehilite .sd { color: #E6DB74 } /* Literal.String.Doc */
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.codehilite .sh { color: #E6DB74 } /* Literal.String.Heredoc */
.codehilite .si { color: #E6DB74 } /* Literal.String.Interpol */
.codehilite .sx { color: #E6DB74 } /* Literal.String.Other */
.codehilite .sr { color: #E6DB74 } /* Literal.String.Regex */
.codehilite .s1 { color: #E6DB74 } /* Literal.String.Single */
.codehilite .ss { color: #E6DB74 } /* Literal.String.Symbol */
.codehilite .bp { color: #A6E22E } /* Name.Builtin.Pseudo */
.codehilite .fm { color: #A6E22E } /* Name.Function.Magic */
.codehilite .vc { color: #F8F8F2 } /* Name.Variable.Class */
.codehilite .vg { color: #F8F8F2 } /* Name.Variable.Global */
.codehilite .vi { color: #F8F8F2 } /* Name.Variable.Instance */
.codehilite .vm { color: #F8F8F2 } /* Name.Variable.Magic */
.codehilite .il { color: #AE81FF } /* Literal.Number.Integer.Long */