:root {
  color-scheme: light;
  --bg: #f7f7f5;
  --surface: #ffffff;
  --surface-muted: #efefec;
  --text: #17191c;
  --muted: #676d73;
  --border: #d9dcde;
  --accent: #ce3f52;
  --accent-strong: #9e2637;
  --header-bg: rgba(247, 247, 245, 0.94);
  --code-bg: #191d22;
  --code-text: #e8edf2;
  --shadow: 0 14px 45px rgba(18, 22, 28, 0.1);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #111315;
  --surface: #181b1e;
  --surface-muted: #202428;
  --text: #f0f2f3;
  --muted: #a4aab0;
  --border: #30353a;
  --accent: #ef6676;
  --accent-strong: #ff8995;
  --header-bg: rgba(17, 19, 21, 0.94);
  --code-bg: #0b0d0f;
  --code-text: #edf2f6;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  transition: background-color 0.4s ease, color 0.4s ease;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: url("/assets/site/hero-alt.jpg") center / cover no-repeat fixed;
  opacity: 0.05;
  content: "";
  transition: opacity 0.5s ease;
}

:root[data-theme="dark"] body::before {
  background-image: url("/assets/site/hero.jpg");
  opacity: 0.08;
}

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

button,
input {
  color: inherit;
  font: inherit;
}

button {
  cursor: pointer;
}

svg {
  width: 1.1rem;
  height: 1.1rem;
  stroke-width: 1.8;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: minmax(12rem, 1fr) auto minmax(8rem, 1fr);
  align-items: center;
  min-height: 4.5rem;
  padding: 0 2rem;
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(14px);
}

.header-profile {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  width: max-content;
}
.header-identity {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 760;
}
.header-avatar {
  width: 2.1rem;
  height: 2.1rem;
  object-fit: cover;
  border-radius: 50%;
}
.header-name {
  font-size: 0.95rem;
}
.header-links {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: 0.25rem;
  padding-left: 0.75rem;
  border-left: 1px solid var(--border);
}
.header-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.45rem;
  color: var(--muted);
  transition: color 0.3s ease, background-color 0.3s ease;
}
.header-links a:hover {
  color: var(--accent);
  background: var(--surface-muted);
}
.header-links svg {
  width: 1.05rem;
  height: 1.05rem;
}

.main-nav {
  display: flex;
  align-items: stretch;
  min-height: 4.5rem;
}

.main-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  padding: 0 1.1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
}

.main-nav a.active::after {
  position: absolute;
  right: 1.1rem;
  bottom: -1px;
  left: 1.1rem;
  height: 2px;
  background: var(--accent);
  content: "";
}

.header-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.35rem;
}

.icon-button {
  display: inline-grid;
  place-items: center;
  width: 2.65rem;
  height: 2.65rem;
  padding: 0;
  border: 0;
  background: transparent;
}

.icon-button:hover {
  background: var(--surface-muted);
}

.nav-toggle {
  display: none;
}

.section-heading p,
.page-heading > p {
  margin: 0 0 0.7rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 760;
  text-transform: uppercase;
}

.section-heading > a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
}

.category-band {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.section-inner {
  width: min(78rem, calc(100% - 4rem));
  margin: 0 auto;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.category-link {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
  padding: 1.25rem 1.4rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.category-link:nth-child(4n) {
  border-right: 0;
}

.category-link:nth-last-child(-n + 4) {
  border-bottom: 0;
}

.category-link:hover {
  background: var(--surface-muted);
}

.category-link > span:nth-child(2) {
  min-width: 0;
}

.category-link strong,
.category-link small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.category-link strong {
  font-size: 0.92rem;
}

.category-link small {
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.category-link b {
  color: var(--muted);
  font-size: 0.8rem;
}

.category-dot {
  display: inline-block;
  flex: 0 0 auto;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--category-color, var(--accent));
}

.posts-section {
  padding: 5rem 0 6rem;
}

.home-feed {
  max-width: 60rem;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.section-heading h2,
.page-heading h1 {
  margin: 0;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 2.2rem;
  line-height: 1.2;
}

.section-heading > a {
  color: var(--muted);
  font-size: 0.85rem;
}

.post-list {
  border-top: 1px solid var(--border);
}

.post-row {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr) 2.7rem;
  gap: 1.5rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--border);
}

.post-date span,
.post-date small {
  display: block;
}

.post-date span {
  font-family: Consolas, monospace;
  font-size: 0.85rem;
  font-weight: 700;
}

.post-date small {
  color: var(--muted);
  font-size: 0.72rem;
}

.post-kicker a,
.article-category {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.post-summary h2 {
  margin: 0.35rem 0 0.55rem;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 1.5rem;
  line-height: 1.35;
}

.post-summary h2 a:hover {
  color: var(--accent);
}

.post-summary p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 0.85rem;
}

.tag-list a {
  color: var(--muted);
  font-size: 0.76rem;
}

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

.row-action {
  display: grid;
  place-items: center;
  align-self: center;
  width: 2.7rem;
  height: 2.7rem;
  border: 1px solid var(--border);
}

.row-action:hover {
  border-color: var(--text);
  background: var(--text);
  color: var(--bg);
}

.page-shell {
  width: min(68rem, calc(100% - 4rem));
  min-height: calc(100vh - 9rem);
  margin: 0 auto;
  padding: 5rem 0 7rem;
}

.page-heading {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.page-heading span {
  display: block;
  margin-top: 0.75rem;
  color: var(--muted);
}

.post-list.wide .post-row {
  grid-template-columns: 5rem minmax(0, 1fr) 2.7rem;
}

.directory-list,
.tag-directory {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--border);
  border-left: 1px solid var(--border);
}

.directory-list .category-link {
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.tag-directory a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem;
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.tag-directory a:hover {
  background: var(--surface-muted);
}

.tag-directory b {
  color: var(--muted);
  font-size: 0.8rem;
}

.article-shell {
  display: grid;
  grid-template-columns: minmax(0, 49rem) 14rem;
  gap: 4.5rem;
  width: min(70rem, calc(100% - 4rem));
  margin: 0 auto;
  padding: 5rem 0 7rem;
}

.article-header {
  margin-bottom: 3.5rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid var(--border);
}

.article-header h1 {
  margin: 0.8rem 0 1rem;
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 2.9rem;
  line-height: 1.2;
}

.article-header > p {
  max-width: 42rem;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 0.8rem;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.article-aside {
  min-width: 0;
}

.toc {
  position: sticky;
  top: 6.5rem;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 8rem);
  overflow: auto;
  border-left: 1px solid var(--border);
}

.toc > span {
  margin: 0 0 0.7rem 1rem;
  font-size: 0.75rem;
  font-weight: 760;
}

.toc a,
.toc small {
  padding: 0.35rem 0 0.35rem 1rem;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.45;
}

.toc a:hover,
.toc a.active {
  border-left: 2px solid var(--accent);
  color: var(--text);
}

.toc-level-3 {
  padding-left: 1.8rem !important;
}

.markdown-body {
  color: var(--text);
  font-family: Georgia, "Noto Serif SC", serif;
  font-size: 1rem;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  scroll-margin-top: 6rem;
  line-height: 1.35;
}

.markdown-body h1 {
  margin: 2.8rem 0 1rem;
  font-size: 2rem;
}

.markdown-body h2 {
  margin: 2.6rem 0 1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border);
  font-size: 1.6rem;
}

.markdown-body h3 {
  margin: 2rem 0 0.8rem;
  font-size: 1.25rem;
}

.markdown-body p,
.markdown-body li {
  line-height: 1.9;
}

.markdown-body a {
  color: var(--accent-strong);
  text-decoration: underline;
  text-underline-offset: 0.2rem;
}

.markdown-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.6rem auto;
  border: 1px solid var(--border);
  cursor: zoom-in;
}

.markdown-body blockquote {
  margin: 1.5rem 0;
  padding: 0.5rem 1.2rem;
  border-left: 3px solid var(--accent);
  background: var(--surface-muted);
  color: var(--muted);
}

.markdown-body pre,
.markdown-body figure.highlight {
  max-width: 100%;
  margin: 1.5rem 0;
  overflow: auto;
  border: 1px solid #303740;
  border-radius: 4px;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: Consolas, "Cascadia Code", monospace;
  font-size: 0.82rem;
  line-height: 1.65;
}

.markdown-body pre {
  padding: 1rem 1.15rem;
}

.markdown-body figure.highlight table {
  width: 100%;
  border-collapse: collapse;
}

.markdown-body figure.highlight td {
  padding: 0;
  border: 0;
}

.markdown-body figure.highlight .gutter {
  width: 3rem;
  padding: 1rem 0.7rem;
  color: #7f8994;
  text-align: right;
  user-select: none;
}

.markdown-body figure.highlight .code {
  padding: 1rem;
}

.markdown-body figure.highlight pre {
  margin: 0;
  padding: 0;
  overflow: visible;
  border: 0;
}

.markdown-body table:not(.highlight table) {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.markdown-body th,
.markdown-body td {
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--border);
}

.hljs-keyword,
.hljs-selector-tag,
.keyword {
  color: #ff7b8a;
}

.hljs-string,
.string {
  color: #b4d273;
}

.hljs-comment,
.comment {
  color: #81909c;
}

.hljs-number,
.number {
  color: #e7b86c;
}

.article-footer {
  margin-top: 4rem;
  padding: 1.2rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.78rem;
}

.article-footer span,
.article-footer a {
  display: block;
  overflow-wrap: anywhere;
}

.post-navigation {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 2rem;
  background: var(--border);
  border: 1px solid var(--border);
}

.post-navigation > a {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
  padding: 1.2rem;
  background: var(--surface);
}

.post-navigation > a:last-child {
  justify-content: flex-end;
  text-align: right;
}

.post-navigation span {
  min-width: 0;
}

.post-navigation small {
  display: block;
  color: var(--muted);
}

.simple-content {
  max-width: 48rem;
}

.empty-state {
  padding: 3rem 0;
  color: var(--muted);
}

.not-found {
  display: grid;
  place-items: center;
  align-content: center;
  min-height: calc(100vh - 9rem);
  text-align: center;
}

.not-found strong {
  color: var(--accent);
  font-family: Consolas, monospace;
  font-size: 6rem;
}

.not-found h1 {
  margin: 0 0 1rem;
}

.not-found a {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.6rem 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.75rem;
}

.search-inline {
  position: relative;
  display: flex;
  align-items: center;
}
.search-inline input {
  width: 0;
  min-width: 0;
  height: 2.65rem;
  padding: 0;
  border: 0;
  border-bottom: 1px solid transparent;
  outline: 0;
  background: transparent;
  color: var(--text);
  opacity: 0;
  transition: width 0.3s ease, opacity 0.25s ease, padding 0.3s ease, border-color 0.3s ease;
}
.search-inline.expanded input {
  width: 13rem;
  padding: 0 0.5rem;
  border-bottom-color: var(--border);
  opacity: 1;
}
.search-inline.expanded input:focus {
  border-bottom-color: var(--accent);
}
.search-inline .search-results {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  width: min(24rem, calc(100vw - 2rem));
  max-height: 24rem;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-0.4rem);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
}
.search-inline.expanded .search-results:not(:empty) {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.search-result {
  display: block;
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

.search-result:hover {
  background: var(--surface-muted);
}

.search-result strong,
.search-result small {
  display: block;
}

.search-result small {
  margin-top: 0.3rem;
  color: var(--muted);
}

.image-viewer {
  max-width: calc(100vw - 3rem);
  max-height: calc(100vh - 3rem);
  padding: 0;
  border: 0;
  background: transparent;
}

.image-viewer img {
  display: block;
  max-width: calc(100vw - 3rem);
  max-height: calc(100vh - 3rem);
}

@media (max-width: 900px) {
  .site-header {
    grid-template-columns: 1fr auto auto;
    padding: 0 1rem;
  }

  .nav-toggle {
    display: inline-grid;
  }

  .main-nav {
    position: absolute;
    top: 4.5rem;
    right: 0;
    left: 0;
    display: none;
    min-height: auto;
    padding: 0.6rem 1rem 1rem;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
  }

  .main-nav.open {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
  }

  .main-nav a {
    justify-content: center;
    min-height: 3rem;
    padding: 0.4rem;
  }

  .main-nav a.active::after {
    right: 0.5rem;
    left: 0.5rem;
  }

  .profile-drawer {
    display: none;
  }


  .article-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .article-aside {
    display: none;
  }
}

@media (max-width: 680px) {
  .brand > span:last-child {
    display: none;
  }

  .header-actions {
    gap: 0;
  }

  .main-nav.open {
    grid-template-columns: repeat(2, 1fr);
  }

  .section-inner,
  .page-shell,
  .article-shell {
    width: min(100% - 2rem, 78rem);
  }

  .category-grid,
  .directory-list,
  .tag-directory {
    grid-template-columns: 1fr;
  }

  .category-link,
  .category-link:nth-child(3n),
  .category-link:nth-last-child(-n + 3) {
    border-right: 0;
    border-bottom: 1px solid var(--border);
  }

  .category-link:last-child {
    border-bottom: 0;
  }

  .posts-section,
  .page-shell,
  .article-shell {
    padding-top: 3rem;
    padding-bottom: 4rem;
  }

  .section-heading {
    align-items: flex-start;
  }

  .section-heading > a {
    margin-top: 0.5rem;
  }

  .post-row,
  .post-list.wide .post-row {
    grid-template-columns: 3.6rem minmax(0, 1fr);
    gap: 0.8rem;
  }

  .post-summary h2 {
    font-size: 1.25rem;
  }

  .row-action {
    display: none;
  }

  .article-header h1 {
    font-size: 2.15rem;
    overflow-wrap: anywhere;
  }

  .markdown-body {
    font-size: 0.95rem;
  }

  .post-navigation {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    padding: 1.4rem 1rem;
  }
}

/* ===== Banner (hexo-theme-yun inspired) ===== */
.banner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 4.5rem);
  background: url("/assets/site/hero-alt.jpg") center / cover no-repeat fixed;
  color: #fff;
  overflow: hidden;
}
:root[data-theme="dark"] .banner {
  background-image: url("/assets/site/hero.jpg");
}
.banner-scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(9, 17, 28, 0.35), rgba(9, 17, 28, 0.6));
}
.banner-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
  padding: 0 2rem;
  text-align: center;
}
.banner-waves {
  position: absolute;
  bottom: 0;
  left: 0;
  z-index: 1;
  display: block;
  width: 100%;
  height: 6rem;
  color: var(--bg);
  transition: color 0.4s ease;
}
.banner-waves .wave-parallax > use {
  animation: wave-move 25s cubic-bezier(0.55, 0.5, 0.45, 0.5) infinite;
}
.banner-waves .wave-parallax > use:nth-child(1) { animation-delay: -2s; animation-duration: 7s; }
.banner-waves .wave-parallax > use:nth-child(2) { animation-delay: -3s; animation-duration: 10s; }
.banner-waves .wave-parallax > use:nth-child(3) { animation-delay: -4s; animation-duration: 13s; }
.banner-waves .wave-parallax > use:nth-child(4) { animation-delay: -5s; animation-duration: 20s; }
@keyframes wave-move {
  0% { transform: translate3d(-90px, 0, 0); }
  100% { transform: translate3d(85px, 0, 0); }
}
.banner-down {
  position: absolute;
  bottom: 6.5rem;
  left: 50%;
  z-index: 2;
  display: inline-flex;
  color: #fff;
  animation: banner-float 2s ease-in-out infinite;
}
.banner-down svg {
  width: 2.2rem;
  height: 2.2rem;
}
@keyframes banner-float {
  0%, 100% { opacity: 1; transform: translateX(-50%) translateY(0); }
  50% { opacity: 0.7; transform: translateX(-50%) translateY(-0.6rem); }
}


/* ===== Scroll reveal + hover micro-interactions ===== */
.post-row {
  opacity: 0;
  transform: translateY(1.2rem);
  transition: opacity 0.55s ease, transform 0.55s ease, background-color 0.35s ease;
}
.post-row.revealed { opacity: 1; transform: none; }
.post-row:hover { background: var(--surface-muted); }
.category-link {
  opacity: 0;
  transform: translateY(1.2rem);
  transition: opacity 0.55s ease, transform 0.3s ease, background-color 0.35s ease;
}
.category-link.revealed { opacity: 1; transform: none; }
.category-link:hover { transform: translateY(-2px); }
.section-heading,
.page-heading,
.article-header {
  opacity: 0;
  transform: translateY(1.2rem);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.section-heading.revealed,
.page-heading.revealed,
.article-header.revealed { opacity: 1; transform: none; }
.directory-list > *,
.tag-directory > * {
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.directory-list > .revealed,
.tag-directory > .revealed { opacity: 1; transform: none; }

/* ===== Misc transitions for theme switch ===== */
.site-header, .category-band, .icon-button, .search-dialog,
.page-shell, .article-shell {
  transition: background-color 0.4s ease, border-color 0.4s ease, color 0.4s ease;
}
.post-summary h2 a { transition: color 0.25s ease; }
.row-action { transition: transform 0.3s ease, border-color 0.3s ease, background-color 0.3s ease, color 0.3s ease; }
.row-action:hover { transform: scale(1.08); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .post-row, .category-link, .section-heading, .page-heading,
  .article-header, .directory-list > *, .tag-directory > * {
    opacity: 1 !important; transform: none !important;
  }
}