/* ============================================================
   垣学 · 全站样式
   风格：杂志编辑 / 目录页
   记忆点：宋体刊头 + 编号列 + 纸质暖底
   约束：纯静态、无外部字体、无 CDN、无 JS
   ============================================================ */

:root {
  --paper: #F6F4EF;
  --paper-2: #FFFFFF;
  --ink: #1C1B19;
  --ink-2: #5A5750;
  --ink-3: #928D83;
  --rule: #DED9CE;
  --accent: #9C4A2F;
  --serif: "Source Han Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --col: 780px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 28px;
}

a { color: inherit; }

::selection {
  background: #E3D9C9;
  color: var(--ink);
}

/* ---------------- 刊头 ---------------- */

.site-header {
  padding-top: 46px;
}

.masthead {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
}

/* 刊头装饰短线：编辑设计的起手式，代替大色块 */
.masthead::before {
  content: "";
  position: absolute;
  margin-top: -18px;
  width: 34px;
  height: 2px;
  background: var(--ink);
}

.site-title {
  margin: 0;
  font-family: var(--serif);
  font-size: 33px;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.site-title a {
  text-decoration: none;
}

.site-title a:hover {
  color: var(--accent);
}

.site-sub {
  margin: 6px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  text-transform: uppercase;
}

.masthead-meta {
  flex: none;
  text-align: right;
  font-family: var(--mono);
  font-size: 11.5px;
  line-height: 1.9;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  padding: 14px 0 0;
  font-size: 13px;
  letter-spacing: 0.1em;
}

.site-nav a {
  color: var(--ink-2);
  text-decoration: none;
  padding-bottom: 2px;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  transition: background-size 0.18s ease, color 0.18s ease;
}

.site-nav a:hover {
  color: var(--ink);
  background-size: 100% 1px;
}

.site-nav a[aria-current="page"] {
  color: var(--ink);
  background-size: 100% 1px;
}

/* ---------------- 通用区段标题 ---------------- */

main { padding-top: 4px; }

section { margin-top: 46px; }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.sec-head h2 {
  margin: 0;
  flex: none;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* 标题右侧的延伸细线，制造目录页的骨架感 */
.sec-head::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
  transform: translateY(-4px);
}

p { margin: 0 0 15px; }
p:last-child { margin-bottom: 0; }

/* ---------------- 引言 ---------------- */

.lede {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.95;
  color: var(--ink);
  letter-spacing: 0.02em;
}

.lede span {
  color: var(--ink-2);
}

/* ---------------- 笔记目录 ---------------- */

.entry-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.entry {
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  align-items: baseline;
  gap: 0 16px;
  padding: 20px 0;
  border-top: 1px solid var(--rule);
}

.entry:first-child { border-top: none; padding-top: 4px; }

.entry-idx {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  transition: color 0.18s ease;
}

.entry:hover .entry-idx { color: var(--accent); }

.entry-title {
  font-family: var(--serif);
  font-size: 18.5px;
  line-height: 1.55;
  font-weight: 600;
  text-decoration: none;
  background-image: linear-gradient(var(--accent), var(--accent));
  background-repeat: no-repeat;
  background-size: 0% 1px;
  background-position: 0 100%;
  transition: background-size 0.2s ease;
}

.entry:hover .entry-title { background-size: 100% 1px; }

.entry-note {
  grid-column: 2 / 3;
  margin: 5px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-2);
}

.entry-date {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

/* 标签 */

.tags {
  grid-column: 2 / 4;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 10px;
}

.tags span {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1px;
}

/* ---------------- 项目（非卡片，编辑式条目） ---------------- */

.work-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.work {
  padding: 22px 0;
  border-top: 1px solid var(--rule);
}

.work:first-child { border-top: none; padding-top: 4px; }

.work-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
}

.work-name {
  margin: 0;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.work-kind {
  flex: none;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
}

.work-desc {
  margin: 7px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-2);
  max-width: 60ch;
}

/* ---------------- 文章页 ---------------- */

.article-head {
  margin-top: 42px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--rule);
}

.article-head h1 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 30px;
  line-height: 1.45;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.article-meta {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.07em;
  color: var(--ink-3);
}

.article-body {
  margin-top: 26px;
  max-width: 41em;
}

.article-body p {
  margin: 0 0 19px;
  font-size: 16.5px;
  line-height: 1.95;
}

/* 首段稍大，接住标题的重量 */
.article-body > p:first-of-type {
  font-size: 17.5px;
  color: var(--ink);
}

.article-body h2 {
  margin: 40px 0 14px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding-left: 14px;
  border-left: 2px solid var(--ink);
  line-height: 1.5;
}

.article-body h3 {
  margin: 28px 0 10px;
  font-size: 16.5px;
  font-weight: 600;
  color: var(--ink);
}

.article-body ul,
.article-body ol {
  margin: 0 0 19px;
  padding-left: 20px;
}

.article-body li {
  margin-bottom: 9px;
  font-size: 16px;
  line-height: 1.9;
}

.article-body code {
  font-family: var(--mono);
  font-size: 0.87em;
  background: #EDEAE2;
  padding: 1px 5px;
  border-radius: 2px;
}

.article-body pre {
  margin: 0 0 22px;
  padding: 16px 18px;
  background: #EDEAE2;
  border-left: 2px solid var(--rule);
  overflow-x: auto;
  line-height: 1.7;
}

.article-body pre code {
  background: none;
  padding: 0;
  font-size: 13px;
}

.article-body blockquote {
  margin: 0 0 20px;
  padding: 0 0 0 16px;
  border-left: 2px solid var(--rule);
  color: var(--ink-2);
}

.article-foot {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  font-size: 14px;
  color: var(--ink-2);
}

/* ---------------- 关于页 ---------------- */

.about-block {
  margin-top: 44px;
}

.about-block p {
  font-size: 16.5px;
  line-height: 1.95;
  max-width: 42em;
}

.fact-list {
  margin: 0;
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 0;
}

.fact-list dt {
  padding: 11px 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-3);
  border-top: 1px solid var(--rule);
}

.fact-list dd {
  margin: 0;
  padding: 11px 0;
  font-size: 15px;
  color: var(--ink);
  border-top: 1px solid var(--rule);
}

/* ---------------- 页脚 ---------------- */

.site-footer {
  margin-top: 64px;
  padding: 22px 0 46px;
  border-top: 1px solid var(--rule);
  font-size: 12.5px;
  line-height: 2;
  color: var(--ink-3);
  letter-spacing: 0.02em;
}

.site-footer p { margin: 0; }

/* 备案号属必看信息，单独提一档颜色，不跟默认的灰 */
.site-footer a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.site-footer a:hover { color: var(--ink); }

/* ---------------- 移动端 ---------------- */

@media (max-width: 680px) {
  body { font-size: 16px; }

  .wrap { padding: 0 20px; }

  .site-header { padding-top: 34px; }

  .masthead {
    display: block;
    padding-bottom: 18px;
  }

  .masthead-meta {
    text-align: left;
    margin-top: 12px;
  }

  .site-title { font-size: 26px; }

  .site-nav { gap: 18px; }

  .entry {
    grid-template-columns: 1.9rem 1fr;
    gap: 0 12px;
  }

  .entry-date {
    grid-column: 2 / 3;
    margin-top: 4px;
    order: 3;
  }

  .entry-title { font-size: 17px; }

  .article-head h1 { font-size: 23px; }

  .article-body { max-width: none; }

  .article-body h2 { font-size: 18.5px; }

  .fact-list {
    grid-template-columns: 1fr;
  }

  .fact-list dt {
    border-top: 1px solid var(--rule);
    padding-bottom: 0;
  }

  .fact-list dd {
    border-top: none;
    padding-top: 2px;
  }

  .lede { font-size: 17px; }
}

/* 降低动效偏好时不保留任何过渡 */
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}