/* ===========================================================
   老P聊中亚 · 编辑版式（Collab Fund 体）
   无配图、无卡片、无阴影；一条黑线 + 一套字号阶梯。
   层级靠字号与留白，不靠加粗（中文衬线没有 600 字重，
   用 600 会被浏览器合成为伪粗体）。
   =========================================================== */

:root {
  --paper: #f2f1ee;      /* 页面底色：极浅暖灰 */
  --paper-2: #e9e7e2;
  --white: #ffffff;
  --ink: #1a1a1a;
  --ink-2: #4d4d4d;
  --ink-3: #9a9791;
  --ink-4: #b8b5af;
  --rule: #d6d3cc;
  --accent: #a3372a;     /* 只出现在选区与正文链接 */

  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC",
    "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "SimSun", STSong,
    Georgia, serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --w: 1120px;
  --pad: 24px;
  --read: 700px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151412;
    --paper-2: #1e1c19;
    --white: #1c1a17;
    --ink: #f0ede7;
    --ink-2: #c2beb6;
    --ink-3: #8b8780;
    --ink-4: #6a6660;
    --rule: #322f2a;
    --accent: #d4695a;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

::selection {
  background: var(--accent);
  color: #fff;
}

.serif {
  font-family: var(--serif);
}

/* ---------- 骨架 ---------- */

.wrap {
  width: 100%;
  max-width: calc(var(--w) + var(--pad) * 2);
  margin: 0 auto;
  padding: 0 var(--pad);
}

@media (max-width: 640px) {
  :root {
    --pad: 18px;
  }
}

/* ---------- 顶栏 ---------- */

.topbar {
  padding: 20px 0 0;
}

.topbar .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.brandmark {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ink);
}

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

.nav {
  display: flex;
  align-items: baseline;
  gap: 22px;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.nav a {
  transition: color 0.16s ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--ink);
}

.nav a[aria-current="page"] {
  border-bottom: 1px solid var(--ink);
  padding-bottom: 2px;
}

@media (max-width: 640px) {
  .nav {
    gap: 16px;
    font-size: 12px;
  }
}

/* ---------- 首页：作者区 ---------- */

.cover {
  padding: 64px 0 0;
}

.cover-title {
  font-family: var(--sans);
  font-size: clamp(42px, 5.8vw, 72px);
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: 0.01em;
  margin: 0;
}

.cover-handle {
  margin: 16px 0 0;
  font-size: 19.5px;
  letter-spacing: 0.04em;
  color: var(--ink-3);
}

.cover-bio {
  margin-top: 40px;
  max-width: 44em;
}

.cover-bio p {
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1.78;
  margin: 0;
  color: var(--ink);
}

.rule-dark {
  border: 0;
  border-top: 2px solid var(--ink);
  margin: 40px 0 0;
}

@media (max-width: 640px) {
  .cover {
    padding-top: 40px;
  }
  .cover-handle {
    font-size: 15px;
  }
  .cover-bio {
    margin-top: 28px;
  }
  .cover-bio p {
    font-size: 17px;
  }
  .rule-dark {
    margin-top: 32px;
  }
}

/* ---------- 首页：文章流 ---------- */

.post-previews {
  padding: 60px 0 0;
}

.post-preview {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto auto;
  align-items: center;
  margin-bottom: 74px;
}

.post-preview__title {
  grid-column: 1 / -1;
  grid-row: 1;
  font-family: var(--sans);
  font-size: clamp(27px, 3.3vw, 40px);
  font-weight: 400;
  line-height: 1.34;
  letter-spacing: 0.01em;
  margin: 0 0 18px;
  text-wrap: balance;
}

.post-preview__title a {
  transition: color 0.16s ease;
}

.post-preview__title a:hover {
  text-decoration: underline;
  text-decoration-color: var(--ink-4);
  text-decoration-thickness: 1px;
  text-underline-offset: 6px;
}

.post-preview__excerpt {
  grid-column: 1 / -1;
  grid-row: 2;
  font-family: var(--serif);
  font-size: 19.5px;
  line-height: 1.72;
  color: var(--ink-2);
  margin: 0;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--rule);
}

.post-meta {
  grid-row: 3;
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.post-meta__topic {
  color: var(--ink-2);
}

/* 挂在摘要横线下面的按钮：只留三条边 */
.post-preview__button {
  grid-row: 3;
  justify-self: end;
  display: inline-block;
  border: 1px solid var(--rule);
  border-top: 0;
  background: var(--paper);
  color: var(--ink);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  padding: 14px 24px;
  transition: background 0.18s ease, color 0.18s ease;
}

.post-preview__button::after {
  content: "→";
  margin-left: 10px;
}

.post-preview__button:hover {
  background: var(--ink);
  color: var(--paper);
}

@media (max-width: 640px) {
  .post-previews {
    padding-top: 40px;
  }
  .post-preview {
    margin-bottom: 48px;
  }
  .post-preview__excerpt {
    font-size: 17px;
  }
  .post-preview__button {
    padding: 10px 16px;
    font-size: 11px;
  }
}

/* 归档入口：接在文章流末尾 */
.all-link {
  display: inline-block;
  margin: 2px 0 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid var(--ink);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--ink);
  transition: opacity 0.16s ease;
}

.all-link:hover {
  opacity: 0.55;
}

/* ---------- 首页：页脚前的栏目条 ---------- */

.topic-strip {
  border-top: 1px solid var(--ink);
  margin-top: 24px;
  padding: 18px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 22px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

.topic-strip__label {
  color: var(--ink-3);
}

.topic-strip a {
  color: var(--ink-2);
  transition: color 0.16s ease;
}

.topic-strip a:hover {
  color: var(--ink);
}

.topic-strip .count {
  font-size: 10px;
  color: var(--ink-4);
  margin-left: 5px;
  font-variant-numeric: tabular-nums;
}

/* ---------- 文章页 ---------- */

.article-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px 0 0;
}

.article-head {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--ink);
  margin-bottom: 44px;
}

.article-head .topic-line {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  margin-bottom: 16px;
}

.article-head h1 {
  font-family: var(--sans);
  font-weight: 400;
  font-size: clamp(29px, 3.6vw, 40px);
  line-height: 1.3;
  letter-spacing: 0.01em;
  margin: 0;
  text-wrap: balance;
}

.article-head .lede {
  font-family: var(--serif);
  font-size: 19.5px;
  line-height: 1.75;
  color: var(--ink-2);
  margin: 22px 0 0;
  max-width: 36em;
}

.article-meta {
  margin-top: 24px;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
}

.article-meta .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--ink-4);
}

/* 正文 */
.prose {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.95;
  color: var(--ink);
}

.prose > *:first-child {
  margin-top: 0;
}

.prose p {
  margin: 0 0 1.5em;
}

.prose h2 {
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.02em;
  margin: 2.5em 0 0.9em;
}

.prose h3 {
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.6;
  margin: 2em 0 0.7em;
}

.prose ul,
.prose ol {
  margin: 0 0 1.5em;
  padding-left: 1.35em;
}

.prose li {
  margin-bottom: 0.5em;
  line-height: 1.9;
}

.prose li::marker {
  color: var(--ink-3);
}

.prose blockquote {
  margin: 2em 0;
  padding: 2px 0 2px 22px;
  border-left: 2px solid var(--ink);
  color: var(--ink-2);
  font-size: 17px;
}

.prose blockquote p {
  margin-bottom: 0.9em;
}

.prose blockquote p:last-child {
  margin-bottom: 0;
}

.prose hr {
  border: none;
  text-align: center;
  margin: 2.6em 0;
  height: 1em;
  line-height: 1;
}

.prose hr::before {
  content: "· · ·";
  letter-spacing: 0.7em;
  color: var(--ink-3);
  font-size: 13px;
}

.prose strong {
  font-weight: 700;
  color: var(--ink);
}

.prose em {
  font-style: italic;
  color: var(--ink-2);
}

.prose a {
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  transition: border-color 0.16s ease;
}

.prose a:hover {
  border-bottom-color: var(--accent);
}

.prose img {
  margin: 2em 0;
  width: 100%;
}

.prose figure img.tall {
  width: 100%;
  max-width: 380px;
  margin: 0 auto;
}

.prose figure {
  margin: 2em 0;
}

.prose figcaption {
  font-family: var(--sans);
  font-size: 12px;
  color: var(--ink-3);
  text-align: center;
  margin-top: 10px;
  line-height: 1.7;
}

.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--paper-2);
  padding: 0.15em 0.4em;
}

.prose pre {
  background: var(--paper-2);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 2em 0;
  border-left: 2px solid var(--ink);
  font-size: 13px;
  line-height: 1.75;
}

.prose pre code {
  background: none;
  padding: 0;
  font-size: inherit;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 13px;
  margin: 2em 0;
  line-height: 1.65;
}

.prose th {
  text-align: left;
  font-weight: 600;
  border-bottom: 1px solid var(--ink);
  padding: 10px 12px 10px 0;
}

.prose td {
  border-bottom: 1px solid var(--rule);
  padding: 10px 12px 10px 0;
  vertical-align: top;
}

.prose th:last-child,
.prose td:last-child {
  padding-right: 0;
}

/* 文章尾 */
.article-foot {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--ink);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  align-items: center;
  justify-content: space-between;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--ink-3);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.tag {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

.tag:hover {
  color: var(--ink);
}

.aside-link {
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
}

.aside-link:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* 上下篇 */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--rule);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-top: 40px;
}

.pager a {
  background: var(--paper);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: background 0.18s ease;
}

.pager a:hover {
  background: var(--paper-2);
}

.pager .dir {
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
}

.pager .t {
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
}

.pager .next {
  text-align: right;
  align-items: flex-end;
}

.pager .empty {
  background: var(--paper);
}

@media (max-width: 640px) {
  .prose {
    font-size: 17px;
    line-height: 1.9;
  }
  .prose h2 {
    font-size: 18px;
  }
  .article-wrap {
    padding-top: 36px;
  }
  .pager {
    grid-template-columns: 1fr;
  }
}

/* ---------- 归档 / 列表页 ---------- */

.page-head {
  padding: 64px 0 22px;
  border-bottom: 1px solid var(--ink);
}

.page-head h1 {
  font-family: var(--sans);
  font-size: clamp(34px, 4.4vw, 52px);
  font-weight: 400;
  line-height: 1.2;
  letter-spacing: 0.01em;
  margin: 0;
}

.page-head p {
  margin: 16px 0 0;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.8;
  color: var(--ink-2);
  max-width: 40em;
}

.year-group {
  margin-top: 44px;
}

.year-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

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

.archive-list li {
  border-bottom: 1px solid var(--rule);
}

.archive-list a {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: baseline;
  padding: 15px 0;
}

.archive-list a:hover .t {
  color: var(--accent);
}

.archive-list .d {
  font-size: 11.5px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.archive-list .t {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  transition: color 0.16s ease;
}

.archive-list .tp {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  white-space: nowrap;
}

/* 栏目页复用首页索引样式 */
.index-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.index-item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 8px;
  padding: 28px 0;
  border-bottom: 1px solid var(--rule);
}

.index-item .num {
  font-size: 11px;
  color: var(--ink-4);
  letter-spacing: 0.06em;
  padding-top: 5px;
  font-variant-numeric: tabular-nums;
}

.index-item .meta {
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--ink-3);
  margin-bottom: 8px;
}

.index-item .meta .topic {
  color: var(--ink-2);
}

.index-item h3 {
  font-family: var(--sans);
  font-size: 25px;
  font-weight: 400;
  line-height: 1.45;
  margin: 0 0 8px;
}

.index-item h3 a:hover {
  color: var(--accent);
}

.index-item p {
  margin: 0;
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-2);
}

@media (max-width: 640px) {
  .archive-list a {
    grid-template-columns: 58px minmax(0, 1fr);
    gap: 12px;
  }
  .archive-list .tp {
    display: none;
  }
  .archive-list .t {
    font-size: 16px;
  }
  .index-item {
    grid-template-columns: 30px minmax(0, 1fr);
    padding: 22px 0;
  }
  .index-item h3 {
    font-size: 20px;
  }
}

/* ---------- 关于页 ---------- */

.about-body {
  max-width: 680px;
  padding: 40px 0 0;
}

.about-body p {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.95;
  color: var(--ink);
  margin: 0 0 1.5em;
}

/* ---------- 联系方式 ---------- */

.contact-block {
  margin: 40px 0 10px;
  border-top: 1px solid var(--ink);
  padding-top: 24px;
}

.contact-block h2 {
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  margin: 0 0 16px;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.contact-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 16px 10px 13px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink-2);
  font-family: var(--sans);
  font-size: 12.5px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: border-color 0.18s ease, color 0.18s ease, background 0.18s ease;
}

.contact-btn svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex: 0 0 auto;
}

.contact-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.contact-btn:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

.contact-revealed {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px 9px 15px;
  border: 1px solid var(--rule);
  background: var(--white);
  font-family: var(--sans);
  font-size: 12.5px;
  max-width: 100%;
}

.contact-revealed a {
  color: var(--ink);
  border-bottom: 1px solid var(--ink-4);
  padding-bottom: 1px;
  overflow-wrap: anywhere;
}

.contact-revealed a:hover {
  color: var(--accent);
}

.copy-btn {
  flex: 0 0 auto;
  padding: 4px 9px;
  border: 1px solid var(--rule);
  background: var(--paper);
  color: var(--ink-3);
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.copy-btn:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.contact-noscript {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--ink-3);
  margin: 0;
}

/* ---------- 页脚 ---------- */

.footer {
  margin-top: 84px;
  border-top: 1px solid var(--ink);
  padding: 22px 0 44px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  align-items: baseline;
  justify-content: space-between;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}

.footer-inner .brand {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink);
}

.footer-links {
  display: flex;
  gap: 20px;
}

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

@media (max-width: 640px) {
  .footer {
    margin-top: 60px;
  }
}

/* ---------- 空状态 ---------- */

.empty-state {
  padding: 72px 0;
  text-align: center;
  color: var(--ink-3);
  font-family: var(--serif);
  font-size: 16px;
}