/* ---- Variables ---- */
:root {
  --bg: #fefcf6;
  --text: #1a1a1a;
  --muted: #3d3d3d;
  --faint: #777;
  --code-bg: #f2f1eb;
  --border: #ddd;
  --link: #1a4bbf;
  --visited: #54457f;
  --radius: 4px;
  --content-width: 720px;
}

[data-theme="dark"] {
  --bg: #4a525a;
  --text: #e8e8e8;
  --muted: #c0c0c0;
  --faint: #8a8a8a;
  --code-bg: #3e454d;
  --border: #5b636b;
  --link: #8ac4ff;
  --visited: #c9b8ea;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #4a525a;
    --text: #e8e8e8;
    --muted: #c0c0c0;
    --faint: #8a8a8a;
    --code-bg: #3e454d;
    --border: #5b636b;
    --link: #8ac4ff;
    --visited: #c9b8ea;
  }
}

/* ---- Reset & Base ---- */
html {
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  color: var(--text);
  background: var(--bg);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  transition: background-color 0.2s ease, color 0.2s ease;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}

body {
  max-width: 920px;
  margin: 0 auto;
  padding: 1rem;
  line-height: 1.5;
  overflow-wrap: break-word;
  overflow-x: hidden;
}

::selection {
  background: var(--link);
  color: var(--bg);
}

a {
  color: var(--link);
  text-underline-offset: 0.24rem;
}

a:visited {
  color: var(--visited);
}

img {
  border-radius: var(--radius);
}

/* ---- Headings ---- */
h1 { font-size: 1.5rem; margin-top: 0; margin-bottom: 0.25rem; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.1rem; }

/* ---- Header ---- */
.site-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
  max-width: var(--content-width);
  margin-left: auto;
  margin-right: auto;
}

body.home .site-header {
  max-width: none;
  margin-left: 0;
  margin-right: 0;
}

.site-title {
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
  color: var(--text);
}

.site-title:visited {
  color: var(--text);
}

/* ---- Index (homepage two-column) ---- */
.index {
  display: flex;
}

.index .article-list {
  flex-grow: 1;
}

.index aside {
  width: 40%;
  min-width: 0;
}

.index aside .avatar {
  display: block;
  margin: 0 auto 1rem;
  border-radius: 50%;
  object-fit: cover;
}

.index aside dt, .index aside dd {
  font-size: 0.95rem;
}

.index aside dd:not(:last-child) {
  margin-bottom: 0.2rem;
}

aside dl {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.2rem 1rem;
}

dl dt {
  font-weight: 700;
}

dl dd {
  margin: 0;
}

.aside-links {
  text-align: center;
  line-height: 1.8;
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

@media (max-width: 640px) {
  .index { display: block; }
  .index aside { width: 100%; margin-bottom: 2rem; }
}

/* ---- Type label (tags in post list) ---- */
.post-list .date a.type-label,
.post-list .date a.type-label:visited,
.post-list .date a.type-label:hover {
  text-decoration: none;
  color: var(--muted);
}

/* ---- Theme toggle ---- */
.theme-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text);
  padding: 0;
  display: flex;
}

/* ---- Post list (homepage) ---- */
.post-list .post {
  margin-bottom: 1rem;
}

.post-list .post a {
  color: var(--link);
}

.post-list .post a:visited {
  color: var(--visited);
}

.post-list .date {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---- Breadcrumbs ---- */
.breadcrumbs {
  margin-bottom: 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---- Content column (post/page) ---- */
.content-column {
  max-width: var(--content-width);
  margin: 0 auto;
}

.content-column li {
  margin-bottom: 0.5rem;
}

/* ---- Post meta ---- */
.post-meta {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---- Article prose ---- */
article ul, article ol {
  padding-left: 1.5rem;
}

article img, article video, article iframe {
  display: block;
  margin: 0 auto;
  max-width: 100%;
}

article sup {
  line-height: 1;
}

/* ---- Code ---- */
pre, code, code[class*="language-"] {
  font-family: ui-monospace, monospace;
  font-size: 0.85rem;
}

code {
  background-color: var(--code-bg);
  padding: 0.08rem 0.24rem;
  border-radius: var(--radius);
}

pre code {
  padding: 0;
  background: transparent;
}

pre {
  background-color: var(--code-bg);
  padding: 0.4rem 0.8rem;
  margin: 1rem 0;
  max-width: 100%;
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.highlight {
  margin: 1rem 0;
}

.highlight pre {
  margin: 0;
}

code, blockquote {
  transition: background-color 0.2s ease;
}

/* ---- Blockquote ---- */
blockquote {
  background-color: var(--code-bg);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  border-radius: var(--radius);
  border-left: 5px solid #7c6f9f;
}

blockquote > p:first-child { margin-top: 0; }
blockquote > p:last-child { margin-bottom: 0; }

/* ---- Table ---- */
table {
  color: var(--text);
  border-collapse: collapse;
  width: 100%;
  font-size: 0.85rem;
}

table thead th {
  border-bottom: 2px solid var(--faint);
  text-align: left;
  font-weight: 600;
}

table th, table td {
  padding: 0.4rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

/* ---- Ornament separator ---- */
.post-ornament {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 2rem 0;
  color: var(--muted);
  font-size: 1.3rem;
}

.post-ornament::before, .post-ornament::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(to var(--dir), var(--border), transparent);
}

.post-ornament::before { --dir: left; }
.post-ornament::after { --dir: right; }

hr {
  border: none;
  text-align: center;
  margin: 2rem 0;
}

hr::after {
  content: "* * *";
  color: var(--muted);
}

/* ---- Footer ---- */
footer {
  margin-top: 2rem;
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

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

footer a:visited {
  color: var(--muted);
}

footer a:hover {
  color: var(--text);
}

/* ---- Back to top ---- */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: max(0.75rem, calc(50% - 480px));
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--muted);
  text-decoration: none;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

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

.back-to-top:visited { color: var(--muted); }
.back-to-top:hover { color: var(--link); }

/* ---- Misc ---- */
.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  flex: 1;
}

/* ---- Responsive ---- */
@media (max-width: 640px) {
  body { padding: 0.75rem; }
}

/* ---- Chroma syntax light ---- */
.chroma .lnt, .chroma .ln { color: #7f7f7f; user-select: none; margin-right: 0.4em; padding: 0 0.4em; }
.chroma .k, .chroma .kd, .chroma .kn, .chroma .kp, .chroma .kr { color: #5317ac; }
.chroma .kc { color: #0000c0; }
.chroma .kt { color: #005a5f; }
.chroma .nb, .chroma .bp { color: #8f0075; }
.chroma .nv, .chroma .vc, .chroma .vg, .chroma .vi, .chroma .vm { color: #00538b; }
.chroma .nf, .chroma .fm { color: #721045; }
.chroma .l, .chroma .ld, .chroma .m, .chroma .mb, .chroma .mf, .chroma .mh, .chroma .mi, .chroma .il, .chroma .mo { color: #0000c0; }
.chroma .s, .chroma .sa, .chroma .sb, .chroma .sc, .chroma .dl, .chroma .sd, .chroma .s2, .chroma .se, .chroma .sh, .chroma .si, .chroma .sx, .chroma .sr, .chroma .s1, .chroma .ss { color: #2544bb; }
.chroma .o, .chroma .ow { color: #00538b; }
.chroma .c, .chroma .ch, .chroma .cm, .chroma .c1, .chroma .cs, .chroma .cp, .chroma .cpf { color: #505050; }

/* ---- Chroma syntax dark ---- */
[data-theme="dark"] pre, [data-theme="dark"] .chroma { color: #fff; }
[data-theme="dark"] .chroma .lnt, [data-theme="dark"] .chroma .ln { color: #7f7f7f; }
[data-theme="dark"] .chroma .k, [data-theme="dark"] .chroma .kd, [data-theme="dark"] .chroma .kn, [data-theme="dark"] .chroma .kp, [data-theme="dark"] .chroma .kr { color: #b6a0ff; }
[data-theme="dark"] .chroma .kc { color: #00bcff; }
[data-theme="dark"] .chroma .kt { color: #6ae4b9; }
[data-theme="dark"] .chroma .nb, [data-theme="dark"] .chroma .bp { color: #f78fe7; }
[data-theme="dark"] .chroma .nv, [data-theme="dark"] .chroma .vc, [data-theme="dark"] .chroma .vg, [data-theme="dark"] .chroma .vi, [data-theme="dark"] .chroma .vm { color: #00d3d0; }
[data-theme="dark"] .chroma .nf, [data-theme="dark"] .chroma .fm { color: #feacd0; }
[data-theme="dark"] .chroma .l, [data-theme="dark"] .chroma .ld, [data-theme="dark"] .chroma .m, [data-theme="dark"] .chroma .mb, [data-theme="dark"] .chroma .mf, [data-theme="dark"] .chroma .mh, [data-theme="dark"] .chroma .mi, [data-theme="dark"] .chroma .il, [data-theme="dark"] .chroma .mo { color: #00bcff; }
[data-theme="dark"] .chroma .s, [data-theme="dark"] .chroma .sa, [data-theme="dark"] .chroma .sb, [data-theme="dark"] .chroma .sc, [data-theme="dark"] .chroma .dl, [data-theme="dark"] .chroma .sd, [data-theme="dark"] .chroma .s2, [data-theme="dark"] .chroma .se, [data-theme="dark"] .chroma .sh, [data-theme="dark"] .chroma .si, [data-theme="dark"] .chroma .sx, [data-theme="dark"] .chroma .sr, [data-theme="dark"] .chroma .s1, [data-theme="dark"] .chroma .ss { color: #79a8ff; }
[data-theme="dark"] .chroma .o, [data-theme="dark"] .chroma .ow { color: #00d3d0; }
[data-theme="dark"] .chroma .c, [data-theme="dark"] .chroma .ch, [data-theme="dark"] .chroma .cm, [data-theme="dark"] .chroma .c1, [data-theme="dark"] .chroma .cs, [data-theme="dark"] .chroma .cp, [data-theme="dark"] .chroma .cpf { color: #a8a8a8; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) pre, :root:not([data-theme="light"]) .chroma { color: #fff; }
  :root:not([data-theme="light"]) .chroma .k, :root:not([data-theme="light"]) .chroma .kd, :root:not([data-theme="light"]) .chroma .kn, :root:not([data-theme="light"]) .chroma .kp, :root:not([data-theme="light"]) .chroma .kr { color: #b6a0ff; }
  :root:not([data-theme="light"]) .chroma .kc { color: #00bcff; }
  :root:not([data-theme="light"]) .chroma .kt { color: #6ae4b9; }
  :root:not([data-theme="light"]) .chroma .nb, :root:not([data-theme="light"]) .chroma .bp { color: #f78fe7; }
  :root:not([data-theme="light"]) .chroma .nv, :root:not([data-theme="light"]) .chroma .vc, :root:not([data-theme="light"]) .chroma .vg, :root:not([data-theme="light"]) .chroma .vi, :root:not([data-theme="light"]) .chroma .vm { color: #00d3d0; }
  :root:not([data-theme="light"]) .chroma .nf, :root:not([data-theme="light"]) .chroma .fm { color: #feacd0; }
  :root:not([data-theme="light"]) .chroma .l, :root:not([data-theme="light"]) .chroma .ld, :root:not([data-theme="light"]) .chroma .m, :root:not([data-theme="light"]) .chroma .mb, :root:not([data-theme="light"]) .chroma .mf, :root:not([data-theme="light"]) .chroma .mh, :root:not([data-theme="light"]) .chroma .mi, :root:not([data-theme="light"]) .chroma .il, :root:not([data-theme="light"]) .chroma .mo { color: #00bcff; }
  :root:not([data-theme="light"]) .chroma .s, :root:not([data-theme="light"]) .chroma .sa, :root:not([data-theme="light"]) .chroma .sb, :root:not([data-theme="light"]) .chroma .sc, :root:not([data-theme="light"]) .chroma .dl, :root:not([data-theme="light"]) .chroma .sd, :root:not([data-theme="light"]) .chroma .s2, :root:not([data-theme="light"]) .chroma .se, :root:not([data-theme="light"]) .chroma .sh, :root:not([data-theme="light"]) .chroma .si, :root:not([data-theme="light"]) .chroma .sx, :root:not([data-theme="light"]) .chroma .sr, :root:not([data-theme="light"]) .chroma .s1, :root:not([data-theme="light"]) .chroma .ss { color: #79a8ff; }
  :root:not([data-theme="light"]) .chroma .o, :root:not([data-theme="light"]) .chroma .ow { color: #00d3d0; }
  :root:not([data-theme="light"]) .chroma .c, :root:not([data-theme="light"]) .chroma .ch, :root:not([data-theme="light"]) .chroma .cm, :root:not([data-theme="light"]) .chroma .c1, :root:not([data-theme="light"]) .chroma .cs, :root:not([data-theme="light"]) .chroma .cp, :root:not([data-theme="light"]) .chroma .cpf { color: #a8a8a8; }
}

/* ---- Print ---- */
@media print {
  .site-header, footer, .post-ornament { display: none; }
  body { max-width: 100%; }
  a { color: inherit; text-decoration: underline; }
  a[href]::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #555; }
  a[href^="#"]::after, a[href^="/"]::after { content: ""; }
}