/* ============================================================
   classic-react — 素雅典雅
   无衬线正文 · 衬线仅用于标题 · 固定导航 · 单一白卡层次
   ============================================================ */

/* 标题字体：霞鹜文楷（webfont，加载失败时逐级回退到系统楷/宋体） */
@import url("https://cdn.jsdelivr.net/npm/lxgw-wenkai-webfont@1.7.0/style.css");

/* 页脚社交图标字体（沿用旧主题 iconfont） */
@font-face {
  font-family: "iconfont";
  src: url("../iconfont/iconfont.eot?t=1611314307930");
  src: url("../iconfont/iconfont.eot?t=1611314307930#iefix") format("embedded-opentype"),
    url("../iconfont/iconfont.woff2?t=1611314307930") format("woff2"),
    url("../iconfont/iconfont.woff?t=1611314307930") format("woff"),
    url("../iconfont/iconfont.ttf?t=1611314307930") format("truetype");
  font-display: block;
}

.iconfont {
  font-family: "iconfont" !important;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:root {
  --bg: #f2f1ec;
  --card: #ffffff;
  --ink: #26251f;
  --ink-soft: #4c4a42;
  --muted: #8a877d;
  --faint: #b5b2a8;
  --hairline: #e8e6df;
  --hairline-strong: #dcD9d0;
  --accent: #9c4221;
  --title: "LXGW WenKai GB", "Songti SC", "Noto Serif SC", Georgia, serif;
  --sans: -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  --banner-h: 400px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

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

::selection {
  background: rgba(156, 66, 33, 0.14);
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 固定导航 ---------- */

.nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border-bottom: 1px solid transparent;
}

.nav-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
  position: relative;
}

.nav-brand {
  font-family: var(--title);
  font-size: 17px;
  font-weight: 400;
  letter-spacing: 2px;
  color: #fff;
  transition: opacity 0.3s ease, color 0.3s ease;
}

/* 首页 banner 已有大标题，顶部透明态先藏起站名，滚动变白后再出现 */
body.home .nav-bar:not(.scrolled) .nav-brand {
  opacity: 0;
  pointer-events: none;
}

.nav-menu {
  list-style: none;
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-menu a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.85);
  padding: 6px 0;
  position: relative;
  transition: color 0.25s ease;
}

.nav-menu a:hover {
  color: #fff;
}

.nav-menu .active a {
  color: #fff;
}

.nav-menu .active a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: currentColor;
}

/* 滚动后：白底 */
.nav-bar.scrolled {
  background: rgba(255, 255, 255, 0.97);
  border-bottom-color: var(--hairline);
  box-shadow: 0 1px 12px rgba(38, 37, 31, 0.06);
}

.nav-bar.scrolled .nav-brand {
  color: var(--ink);
  opacity: 1;
  pointer-events: auto;
}

.nav-bar.scrolled .nav-menu a {
  color: var(--muted);
}

.nav-bar.scrolled .nav-menu a:hover {
  color: var(--accent);
}

.nav-bar.scrolled .nav-menu .active a {
  color: var(--accent);
}

.nav-toggle {
  display: none;
  width: 32px;
  height: 32px;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  margin: 0 auto;
  background: #fff;
  transition: transform 0.25s ease, opacity 0.25s ease, background 0.3s ease;
}

.nav-bar.scrolled .nav-toggle span {
  background: var(--ink);
}

.nav-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(4px, 4px);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(4px, -4px);
}

@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: #fff;
    border-bottom: 1px solid var(--hairline);
    box-shadow: 0 12px 24px rgba(38, 37, 31, 0.1);
    padding: 6px 0 12px;
  }

  .nav-menu.open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
    text-align: center;
  }

  .nav-menu a {
    display: block;
    padding: 12px 0;
    color: var(--ink-soft);
  }

  .nav-menu a:hover {
    color: var(--accent);
  }

  .nav-menu .active a {
    color: var(--accent);
  }

  .nav-menu .active a::after {
    display: none;
  }
}

/* ---------- 照片报头 ---------- */

.banner {
  position: relative;
  height: var(--banner-h);
  background-color: #33302b;
  background-position: center;
  background-size: cover;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

/* 背景独立图层：图片加载完成后由模糊逐渐变清晰（onload 内联触发） */
.banner {
  overflow: hidden;
}

.banner-img {
  position: absolute;
  inset: 0;
  background-position: center;
  background-size: cover;
}

/* 桌面端：图片层以视口为基准定位并钉住，滚动时报头窗口从静止的照片上移过。
   尺寸按满宽报头框算（照片 2048×1152 → 高 = 宽 × 0.5625），取景与线上一致。 */
@media (min-width: 721px) {
  .banner-img {
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-size: 100vw 56.25vw;
    background-position: center calc((var(--banner-h) - 56.25vw) / 2);
  }
}

/* 隐藏的真实 <img>：只负责 load/error 事件探测 */
.banner-preload {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

/* 常驻淡毛玻璃层：保证细体标题在照片上可读 */
.banner-frost {
  position: absolute;
  inset: 0;
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
  background: rgba(20, 18, 16, 0.1);
  pointer-events: none;
}

/* 加载遮罩层：强毛玻璃盖住图，加载完成后渐隐露出清晰照片 */
.banner-glass {
  position: absolute;
  inset: 0;
  -webkit-backdrop-filter: blur(18px) saturate(1.15);
  backdrop-filter: blur(18px) saturate(1.15);
  transition: opacity 1.4s ease-out;
  pointer-events: none;
}

.banner.loaded .banner-glass {
  opacity: 0;
}

/* 图片加载失败时隐藏图层，回退为纯色底 */
.banner.img-error .banner-img {
  visibility: hidden;
}

.banner-shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(24, 22, 20, 0.42), rgba(24, 22, 20, 0.52));
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .banner-glass {
    display: none;
  }
}

.banner-inner {
  position: relative;
  z-index: 2;
  padding: 0 24px;
  max-width: 720px;
}

.banner-title {
  font-family: var(--title);
  font-size: 42px;
  font-weight: 400;
  letter-spacing: 5px;
  color: #faf8f4;
  text-shadow: 0 2px 16px rgba(0, 0, 0, 0.3);
}

.banner-subtitle {
  margin-top: 16px;
  font-size: 14px;
  font-weight: 300;
  letter-spacing: 3px;
  color: rgba(250, 248, 244, 0.85);
}

.banner-page-title {
  font-family: var(--title);
  font-size: 30px;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: 2px;
  color: #faf8f4;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.banner-meta {
  margin-top: 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  color: rgba(250, 248, 244, 0.72);
}

.banner-meta a {
  font-family: var(--sans);
  letter-spacing: 1px;
  color: rgba(250, 248, 244, 0.72);
}

.banner-meta a:hover {
  color: #faf8f4;
}

.banner-meta span + a::before,
.banner-meta a + a::before {
  content: " · ";
}

@media (max-width: 720px) {
  .banner {
    height: 280px;
  }

  .banner-title {
    font-size: 30px;
    letter-spacing: 5px;
  }

  .banner-page-title {
    font-size: 22px;
  }
}

/* ---------- 主体：单一白卡 ---------- */

.main {
  position: relative;
  z-index: 10;
  padding: 0 0 8px;
}

.sheet {
  position: relative;
  margin-top: -56px;
  background: var(--card);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  box-shadow: 0 12px 40px rgba(38, 37, 31, 0.08);
  padding: 48px 52px;
}

@media (max-width: 720px) {
  .sheet {
    margin-top: -36px;
    padding: 32px 20px;
    border-radius: 8px;
  }
}

/* ---------- 首页文章列表 ---------- */

.post-list {
  list-style: none;
}

.post-entry {
  padding: 20px 0;
  border-bottom: 1px solid var(--hairline);
}

.post-entry:first-child {
  padding-top: 0;
}

.post-entry:last-child {
  border-bottom: none;
  padding-bottom: 8px;
}

/* 标题为主体，日期安静地靠右、对齐首行 */
.post-entry-line {
  display: flex;
  align-items: baseline;
  gap: 18px;
}

.post-entry-main {
  flex: 1;
  min-width: 0;
}

.post-entry-title {
  font-family: var(--title);
  font-size: 19px;
  font-weight: 400;
  line-height: 1.5;
  color: var(--ink);
}

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

.post-entry-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  flex-shrink: 0;
}

.post-entry-meta {
  margin-top: 4px;
  font-size: 12px;
  color: var(--faint);
}

.post-entry-meta a:hover {
  color: var(--accent);
}

/* ---------- 分页 ---------- */

.pager {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
  padding: 36px 0 4px;
  font-size: 13px;
}

.pager a {
  color: var(--ink-soft);
  padding: 6px 16px;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
}

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

.pager .pager-num {
  font-family: var(--mono);
  color: var(--faint);
}

.pager .pager-disabled {
  color: var(--faint);
  opacity: 0.45;
  padding: 6px 16px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
}

/* ---------- 正文排版 ---------- */

.prose {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.prose p {
  margin: 0 0 1.2em;
}

.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--title);
  color: var(--ink);
  line-height: 1.5;
}

.prose h2 {
  font-size: 21px;
  margin: 2em 0 0.9em;
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--hairline);
}

.prose h3 {
  font-size: 18px;
  margin: 1.7em 0 0.7em;
}

.prose h4 {
  font-size: 16px;
  margin: 1.4em 0 0.6em;
}

.prose img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1.8em auto;
  border-radius: 4px;
}

.prose blockquote {
  margin: 1.5em 0;
  padding: 10px 18px;
  border-left: 3px solid var(--hairline-strong);
  background: #faf9f6;
  color: var(--muted);
  border-radius: 0 4px 4px 0;
}

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

.prose ul,
.prose ol {
  margin: 0 0 1.2em;
  padding-left: 1.5em;
}

.prose li {
  margin-bottom: 0.35em;
}

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

.prose hr {
  border: none;
  border-top: 1px solid var(--hairline);
  margin: 2.4em 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 14px;
}

.prose th {
  font-size: 13px;
  font-weight: 500;
  text-align: left;
  color: var(--muted);
}

.prose th,
.prose td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--hairline);
}

.prose a {
  color: var(--accent);
  border-bottom: 1px solid rgba(156, 66, 33, 0.3);
}

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

.prose code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: rgba(38, 37, 31, 0.05);
  border-radius: 3px;
  padding: 2px 5px;
  color: var(--ink-soft);
}

/* hexo 代码块 */
.prose figure.highlight,
.prose pre {
  margin: 1.5em 0;
  padding: 16px 18px;
  background: #f7f6f2;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  overflow-x: auto;
  line-height: 1.7;
}

.prose figure.highlight pre {
  margin: 0;
  padding: 0;
  border: none;
  background: none;
}

.prose figure.highlight table {
  width: auto;
  margin: 0;
  border: none;
}

.prose figure.highlight td,
.prose figure.highlight th {
  border: none;
  padding: 0;
}

.prose figure.highlight td.gutter {
  padding-right: 14px;
  color: var(--faint);
  font-family: var(--mono);
  font-size: 13px;
  user-select: none;
}

.prose figure.highlight td.gutter pre {
  color: var(--faint);
}

.prose figure.highlight .code pre {
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--ink-soft);
}

.prose pre code {
  background: none;
  padding: 0;
}

.prose figcaption {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 8px;
}

/* 行内高亮 token */
.prose .keyword,
.prose .built_in,
.prose .type {
  color: #7a4a2b;
}

.prose .string,
.prose .attr,
.prose .symbol {
  color: #4a6b4a;
}

.prose .number,
.prose .literal {
  color: #9c4221;
}

.prose .comment {
  color: var(--faint);
  font-style: italic;
}

.prose .function .title,
.prose .title.function_ {
  color: #3d5a80;
}

/* 数学公式 */
mjx-container {
  color: var(--ink-soft) !important;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 2px 0;
}

mjx-container > svg {
  margin: 0 auto;
}

mjx-container[display="true"] {
  display: block;
  margin: 1.5em 0 !important;
  text-align: center;
}

/* ---------- 文章页脚 ---------- */

.article-footer {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 1px solid var(--hairline);
}

.article-tags {
  text-align: center;
  font-size: 13px;
  color: var(--muted);
}

.article-tags a {
  display: inline-block;
  margin: 4px 5px;
  padding: 4px 14px;
  color: var(--ink-soft);
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
}

.article-tags a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.post-nav {
  margin-top: 30px;
}

.post-nav-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--hairline);
}

.post-nav-item:first-child {
  border-top: 1px dashed var(--hairline);
}

.post-nav-label {
  font-size: 12px;
  color: var(--faint);
  flex-shrink: 0;
}

.post-nav-title {
  font-size: 14px;
  color: var(--ink-soft);
  text-align: right;
}

.post-nav-title:hover {
  color: var(--accent);
}

/* ---------- 归档 ---------- */

.archive-year {
  margin-top: 40px;
}

.archive-year:first-of-type {
  margin-top: 0;
}

.archive-year-label {
  font-family: var(--title);
  font-size: 19px;
  font-weight: 400;
  color: var(--ink);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--hairline);
}

.archive-list {
  list-style: none;
}

.archive-item {
  margin-top: 10px;
}

.archive-item a {
  display: flex;
  align-items: baseline;
  gap: 18px;
  padding: 13px 16px;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.archive-item a:hover {
  border-color: var(--hairline-strong);
  box-shadow: 0 4px 14px rgba(38, 37, 31, 0.08);
  transform: translateY(-1px);
}

.archive-item-date {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--faint);
  flex-shrink: 0;
  width: 44px;
}

.archive-item-title {
  font-size: 15px;
  color: var(--ink-soft);
  flex: 1;
}

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

.archive-item-cat {
  font-size: 12px;
  color: var(--faint);
  flex-shrink: 0;
}

/* ---------- 标签 / 分类 ---------- */

.page-heading {
  text-align: center;
  margin-bottom: 36px;
}

.page-heading-title {
  font-family: var(--title);
  font-size: 24px;
  font-weight: 400;
  color: var(--ink);
  letter-spacing: 2px;
}

.cloud .tag-list,
.cloud .category-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 4px 0;
  margin: 0;
}

/* 胶囊整体包住「名称 + 数量」（数量是 <a> 的兄弟节点，所以胶囊画在 li 上） */
.cloud .tag-list-item,
.cloud .category-list-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 7px 16px;
  list-style: none;
  background: #fff;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  transition: border-color 0.2s ease;
}

.cloud .tag-list-item:hover,
.cloud .category-list-item:hover {
  border-color: var(--accent);
}

.cloud .tag-list-link,
.cloud .category-list-link {
  font-size: 14px;
  color: var(--ink-soft);
  transition: color 0.2s ease;
}

.cloud .tag-list-item:hover .tag-list-link,
.cloud .category-list-item:hover .category-list-link {
  color: var(--accent);
}

.cloud .tag-list-count,
.cloud .category-list-count {
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1;
  color: var(--faint);
  padding: 3px 7px;
  background: var(--bg);
  border-radius: 999px;
}

.cloud .category-list-child {
  display: none;
}

/* ---------- 照片页 ---------- */

.photo-section {
  margin: 44px 0 18px;
  text-align: center;
  font-family: var(--title);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 2px;
  color: var(--ink);
}

.photo-section:first-child {
  margin-top: 0;
}

.photo-flow {
  column-count: 3;
  column-gap: 12px;
}

.photo-flow .item {
  display: block;
  margin-bottom: 12px;
  break-inside: avoid;
}

.photo-flow img {
  width: 100%;
  display: block;
  border-radius: 4px;
  transition: opacity 0.2s ease;
}

.photo-flow a:hover img {
  opacity: 0.88;
}

.photo-empty {
  text-align: center;
  color: var(--faint);
  font-size: 13px;
  padding: 60px 0;
}

@media (max-width: 720px) {
  .photo-flow {
    column-count: 2;
  }
}

/* ---------- 页脚 ---------- */

.site-footer {
  max-width: 820px;
  margin: 40px auto 0;
  padding: 0 24px 44px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 26px;
  margin-bottom: 14px;
}

.footer-links a {
  display: inline-flex;
  font-size: 12.5px;
  color: var(--muted);
}

.footer-links a .iconfont {
  font-size: 18px;
  line-height: 1;
}

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

.footer-copy {
  font-size: 12px;
  color: var(--faint);
  line-height: 2;
}

.footer-copy a {
  color: var(--faint);
}

.footer-copy a:hover {
  color: var(--accent);
}

/* ---------- 回到顶部 ---------- */

.back-top {
  position: fixed;
  right: 32px;
  bottom: 40px;
  width: 40px;
  height: 40px;
  line-height: 38px;
  text-align: center;
  background: #fff;
  border: 1px solid var(--hairline);
  border-radius: 50%;
  box-shadow: 0 4px 14px rgba(38, 37, 31, 0.12);
  color: var(--muted);
  font-size: 15px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, color 0.2s ease;
  z-index: 90;
}

.back-top.visible {
  opacity: 1;
  pointer-events: auto;
}

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

@media (max-width: 720px) {
  .back-top {
    right: 18px;
    bottom: 26px;
  }
}