@import url("https://fonts.googleapis.com/css2?family=Cormorant+Garamond:wght@600;700&family=Noto+Serif+SC:wght@600;700&display=swap");

:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-soft: #f6f6f6;
  --surface-soft-strong: #ececec;
  --text: #111111;
  --text-muted: #555555;
  --line: #e5e5e5;
  --accent: #111111;
  --post-link: #0b57d0;
  --accent-soft: #f2f2f2;
  --radius: 8px;
  --radius-sm: 6px;
  --shadow: none;
}

body.dark {
  color-scheme: dark;
  --bg: #151415;
  --surface: #252525;
  --surface-soft: #2f2f2f;
  --surface-soft-strong: #262626;
  --text: #f2f2f2;
  --text-muted: #c4c4c4;
  --line: #3e3e3e;
  --accent: #f2f2f2;
  --post-link: #8ab4ff;
  --accent-soft: #303030;
  --shadow: none;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: Inter, "SF Pro Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(920px, calc(100% - 2rem));
  margin: 0 auto;
}

.header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(980px, calc(100% - 2rem));
  margin: 0 auto;
  min-height: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  overflow-y: hidden;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 0 0 auto;
}

.logo-switches {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex: 0 0 auto;
  margin-left: auto;
}

.logo > a {
  font-family:
    "Cormorant Garamond",
    "Noto Serif SC",
    "Times New Roman",
    Georgia,
    serif;
  font-weight: 700;
  font-size: 1.22rem;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--text);
}

/* Subtle metallic gradient on the title; solid color fallback where clip is unsupported */
@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .logo > a {
    background-image: linear-gradient(
      118deg,
      var(--text) 0%,
      var(--text-muted) 48%,
      var(--text) 100%
    );
    background-size: 200% 100%;
    background-position: 0% 50%;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
    transition: background-position 0.45s ease;
  }
}

.logo > a:hover {
  text-decoration: none;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .logo > a:hover {
    background-position: 100% 50%;
  }
}

#menu {
  list-style: none;
  display: flex;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  overflow-x: auto;
  scrollbar-width: thin;
}

#menu li {
  flex: 0 0 auto;
}

#menu a {
  display: inline-flex;
  white-space: nowrap;
  padding: 0.34rem 0.62rem;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background-color 0.16s ease, color 0.16s ease;
}

#menu a:hover {
  text-decoration: none;
  background: var(--surface-soft);
  color: var(--text);
}

#menu .active {
  color: var(--accent);
  background: transparent;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

#menu .menu-icon {
  font-size: 1.05rem;
  vertical-align: middle;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

#theme-toggle {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  border: 0;
  background: var(--surface);
  color: var(--text);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.menu-toggle {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  display: none;
  place-items: center;
  cursor: pointer;
}

.menu-toggle iconify-icon {
  font-size: 1rem;
}

#theme-toggle svg {
  width: 16px;
  height: 16px;
}

body:not(.dark) #moon,
body.dark #sun {
  display: none;
}

.main {
  padding: 2.2rem 0 3rem;
}

.profile {
  margin-top: 1rem;
  padding: 0 0.8rem;
}

.profile_inner {
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 0;
  box-shadow: var(--shadow);
}

.profile_inner > img {
  width: clamp(150px, 28vw, 180px);
  height: auto;
  border-radius: 0;
  border: 3px solid var(--surface-soft);
}

.profile_inner h1 {
  margin: 0.9rem 0 0.5rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-family:
    "Cormorant Garamond",
    "Noto Serif SC",
    "Times New Roman",
    Georgia,
    serif;
  font-weight: 700;
}

.profile_inner > span {
  color: var(--text-muted);
  display: block;
  font-size: 0.99rem;
}

.profile_inner > span iconify-icon {
  vertical-align: -0.14em;
}

.social-icons {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.social-icons a {
  color: var(--text-muted);
  min-height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
  padding: 0.32rem 0.6rem;
  text-decoration: none;
}

.social-icons a iconify-icon {
  font-size: 1.1rem;
}

.social-icons a span {
  font-size: 0.86rem;
  line-height: 1;
}

.social-icons a.icon-only {
  width: 2rem;
  padding: 0;
  justify-content: center;
}

.buttons {
  margin-top: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--surface-soft);
  padding: 0.3rem 0.7rem;
  font-weight: 500;
  text-decoration: none;
}

.page-header {
  margin-bottom: 1rem;
}

.page-header h1 {
  margin: 0.3rem 0 0;
  letter-spacing: -0.02em;
}

.breadcrumbs {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.28rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.2;
}

.crumb-separator {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  line-height: 1;
}

.crumb-separator iconify-icon {
  font-size: 0.9em;
}

.post-entry {
  position: relative;
  margin: 0 0 0.9rem;
  background: transparent;
  border: 0;
  border-radius: var(--radius);
  padding: 1.05rem;
  box-shadow: none;
  transition: background-color 0.16s ease;
}

.post-entry:hover {
  background: var(--surface-soft);
}

.post-entry.has-cover {
  display: grid;
  grid-template-columns: clamp(96px, 24vw, 180px) minmax(0, 1fr);
  align-items: stretch;
  gap: 0.9rem;
}

.entry-cover {
  margin-bottom: 0;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  width: 100%;
  align-self: stretch;
}

.entry-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  border: 0;
}

.entry-header h2 {
  margin: 0;
  font-size: 1.14rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text);
}

.entry-content p {
  margin: 0.6rem 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
  overflow-wrap: anywhere;
  word-break: break-word;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 5;
  overflow: hidden;
}

.entry-footer {
  margin-top: 0.85rem;
  color: var(--text-muted);
  font-size: 0.84rem;
}

.entry-link {
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
}

.post-single {
  background: var(--bg);
  border: 0;
  border-radius: var(--radius);
  padding: 1.6rem;
  box-shadow: none;
}

.post-title {
  margin: 0.2rem 0 0.55rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.post-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.toc {
  margin: 1.1rem 0;
  border: 1px solid color-mix(in srgb, var(--line) 90%, transparent);
  border-radius: var(--radius-sm);
  background: transparent;
  overflow: hidden;
}

.toc summary {
  cursor: pointer;
  padding: 0.7rem 0.9rem;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
}

.toc summary::-webkit-details-marker {
  display: none;
}

.toc summary::after {
  content: "";
  width: 0.5rem;
  height: 0.5rem;
  border-right: 1.5px solid var(--text-muted);
  border-bottom: 1.5px solid var(--text-muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
  margin-right: 0.1rem;
}

.toc details[open] summary::after {
  transform: rotate(225deg);
  margin-top: 0.2rem;
}

.toc .inner {
  border-top: 1px solid var(--line);
  padding: 0.6rem 0.95rem 0.75rem;
}

.toc ul {
  margin: 0.25rem 0 0;
  padding-left: 0;
  list-style: none;
}

.toc li {
  margin: 0.22rem 0;
}

.toc li li {
  margin-left: 0.9rem;
}

.toc a {
  color: var(--text-muted);
  font-size: 0.88rem;
  text-decoration: none;
}

.toc a:hover {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.post-content h1,
.post-content h2,
.post-content h3 {
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.post-content a {
  color: var(--post-link);
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

.post-content a:hover {
  opacity: 0.85;
}

/* MathJax CHTML (build-time): match body text scale but read a bit larger */
.post-content mjx-container.MathJax {
  font-size: 1.09em;
}

.post-content img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  margin-left: auto;
  margin-right: auto;
  border-radius: var(--radius-sm);
}

.post-content .image-caption {
  display: block;
  margin-top: 0.45rem;
  margin-bottom: 1rem;
  font-size: 0.84rem;
  color: var(--text-muted);
  text-align: center;
}

.post-content table {
  width: 100%;
  overflow-x: auto;
  display: block;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.post-content th,
.post-content td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.6rem;
}

.post-content code,
.post-content pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.post-content pre {
  position: relative;
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  /* Tight top; extra right padding reserves the copy button column so we do not
     need a tall top pad to clear it vertically */
  padding: 0.7rem 2.65rem 0.8rem 0.8rem;
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.5;
}

body.dark .post-content pre {
  background: #1e1e1e;
}

.post-content pre code {
  font-size: 0.82rem;
  line-height: 1.5;
}

/* Shiki sets per-token colors via inline styles; do not set span { color } here —
   !important would override those inlines and flatten the whole block to one color. */
.post-content pre.astro-code {
  background-color: var(--shiki-light-bg, var(--surface-soft)) !important;
}

body.dark .post-content pre.astro-code {
  background-color: var(--shiki-dark-bg, #1e1e1e) !important;
}

.copy-code {
  position: absolute;
  top: 0.45rem;
  right: 0.45rem;
  width: 1.85rem;
  height: 1.85rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--text);
  border-radius: 6px;
  padding: 0;
  font-size: 1.08rem;
  cursor: pointer;
  z-index: 2;
}

.post-tags {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.post-tags li a {
  display: inline-flex;
  font-size: 0.82rem;
  background: color-mix(in srgb, var(--surface-soft) 35%, var(--bg));
  border: 1px solid var(--line);
  color: var(--text-muted);
  border-radius: 999px;
  padding: 0.14rem 0.6rem;
  text-decoration: none;
}

.post-tags li a:hover {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.post-nav {
  margin-top: 1.2rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
}

.post-nav-button {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  /* Blend panel tint toward page bg so blocks don’t float above it */
  background: color-mix(in srgb, var(--surface-soft-strong) 34%, var(--bg));
  color: var(--text);
  padding: 0.55rem 0.65rem;
  text-decoration: none;
  min-height: 4rem;
}

body:not(.dark) .post-nav-button {
  background: var(--bg);
}

.post-nav-button span {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.post-nav-button strong {
  font-size: 0.88rem;
  line-height: 1.35;
}

.post-nav-button.disabled {
  opacity: 0.6;
}

#searchbox {
  background: transparent;
  border: 0;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
}

#searchInput {
  width: 100%;
  border: 1px solid var(--line);
  background: #efefef;
  color: var(--text);
  border-radius: 10px;
  padding: 0.72rem 0.8rem;
  font: inherit;
}

body.dark #searchInput {
  background: #1f1f1f;
}

#searchInput:focus {
  outline: 2px solid var(--line);
  border-color: var(--text-muted);
}

.search-status {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0.65rem 0 0.2rem;
}

#searchResults {
  margin: 0.6rem 0 0;
  padding: 0;
  list-style: none;
}

.search-result-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

.search-result-link:hover {
  text-decoration: none;
}

.archive-year {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.archive-entry {
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
}

.archive-entry:last-child {
  border-bottom: 0;
}

.archive-entry-title {
  margin: 0;
  font-size: 1rem;
}

.archive-meta {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer {
  width: min(980px, calc(100% - 2rem));
  margin: 1.2rem auto 2rem;
  padding-top: 1.35rem;
  padding-bottom: 1rem;
  border-top: 1px solid var(--line);
  /* Softer than --text-muted: blend toward page bg so the line reads as secondary */
  color: color-mix(in srgb, var(--text-muted) 62%, var(--bg));
  font-size: 0.86rem;
  display: block;
  text-align: center;
}

.footer a {
  color: inherit;
}

.top-link {
  position: fixed;
  right: 1.2rem;
  bottom: 1.2rem;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 7px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--surface-soft) 90%, transparent);
  color: var(--text);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.top-link iconify-icon {
  font-size: 1.05rem;
}

.top-link:hover {
  background: var(--surface-soft-strong);
  transform: translateY(-1px);
}

.top-link:hover {
  text-decoration: none;
}

@media (max-width: 760px) {
  .nav {
    height: 64px;
    min-height: 64px;
    padding: 0;
    flex-wrap: nowrap !important;
    gap: 0.5rem;
  }

  .nav-right {
    width: auto;
    margin-left: auto;
    min-width: 0;
    gap: 0.45rem;
  }

  #menu {
    flex-wrap: nowrap;
    white-space: nowrap;
  }

  .profile_inner,
  .post-single {
    padding: 1.2rem;
  }

  .profile {
    padding: 0 0.25rem;
  }

  .post-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .entry-header h2 {
    font-size: 1.02rem;
    line-height: 1.3;
  }

  .entry-content p {
    font-size: 0.88rem;
    margin-top: 0.45rem;
  }

  .entry-footer {
    font-size: 0.78rem;
    margin-top: 0.65rem;
  }
}

@media (max-width: 640px) and (orientation: portrait) {
  .nav {
    position: relative;
    height: 64px;
    min-height: 64px;
    flex-wrap: nowrap !important;
    padding: 0;
  }

  .nav-right {
    width: auto;
    margin-left: auto;
  }

  .menu-toggle {
    display: grid;
  }

  #menu {
    display: none;
    position: absolute;
    top: calc(100% + 0.35rem);
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0.2rem;
    padding: 0.4rem;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    background: var(--bg);
    overflow: visible;
    z-index: 20;
  }

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

  #menu a {
    display: flex;
    width: 100%;
    border-radius: var(--radius-sm);
  }
}