/* mai1015 blog. Tokens and components follow DESIGN.md (shared with /resume/).
   Layout: a fixed identity panel on the left (a sticky bar on phones), writing on the right. */
:root {
  --ground: #ECEEF1; --surface: #F7F8FA; --sunk: #E2E5EA;
  --ink: #14181F; --ink-2: #444C5A; --ink-3: #626B7B;
  --rule: #D3D7DE; --rule-strong: #AEB5C0;
  --signal-tint: #FBE7DB; --signal-soft: #F2B28E; --signal: #E8590C;
  --signal-ink: #AD3A08; --signal-fill: #C8410B; --on-signal: #FFFFFF;
  --shadow: 20 24 31;

  --side-bg: #14181F; --side-ink: #E8EBF0; --side-ink-2: #AAB2BF; --side-ink-3: #838C9C;
  --side-rule: #2A303A; --side-signal: #FF7A33;

  --code-kw: #9C3A0C; --code-str: #2D6A36; --code-com: #6B7280; --code-num: #1D5CA6;
  --code-fn: #6A3D9E; --code-type: #0E6A70; --code-err: #B42318;

  --f-display: "Archivo", "Arial Narrow", "Helvetica Neue", sans-serif;
  --f-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --f-mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, "PingFang SC", monospace;

  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px;
  --s-6: 32px; --s-7: 48px; --s-8: 72px; --s-9: 112px;
  --side-w: 20rem; --col: 52rem; --gutter: 20px; --measure: 44rem; --r-1: 3px; --r-2: 6px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ground: #0F1216; --surface: #161A20; --sunk: #1D222A;
    --ink: #E8EBF0; --ink-2: #AAB2BF; --ink-3: #838C9C;
    --rule: #2A303A; --rule-strong: #414957;
    --signal-tint: #3A2015; --signal-soft: #8A4420; --signal: #FF7A33;
    --signal-ink: #FF9A62; --signal-fill: #F2702B; --on-signal: #14181F;
    --shadow: 0 0 0; --side-bg: #090B0E; --side-rule: #232831;
    --code-kw: #FF9A62; --code-str: #8FD19E; --code-com: #8A93A3; --code-num: #8DB8F2;
    --code-fn: #C9A6F2; --code-type: #6FD3D9; --code-err: #FF8A80;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --ground: #0F1216; --surface: #161A20; --sunk: #1D222A;
  --ink: #E8EBF0; --ink-2: #AAB2BF; --ink-3: #838C9C;
  --rule: #2A303A; --rule-strong: #414957;
  --signal-tint: #3A2015; --signal-soft: #8A4420; --signal: #FF7A33;
  --signal-ink: #FF9A62; --signal-fill: #F2702B; --on-signal: #14181F;
  --shadow: 0 0 0; --side-bg: #090B0E; --side-rule: #232831;
  --code-kw: #FF9A62; --code-str: #8FD19E; --code-com: #8A93A3; --code-num: #8DB8F2;
  --code-fn: #C9A6F2; --code-type: #6FD3D9; --code-err: #FF8A80;
  color-scheme: dark;
}
@media (min-width: 720px) { :root { --gutter: 32px; } }

/* Base */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--ground); color: var(--ink); font: 400 1rem/1.6 var(--f-body); -webkit-font-smoothing: antialiased; }
img { max-width: 100%; height: auto; }
a { color: var(--signal-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: var(--r-1); }
svg { display: block; flex: none; }
.label { margin: 0; font: 500 .875rem/1.4 var(--f-body); color: var(--ink-3); }
.label a { color: inherit; text-decoration: none; }
.label a:hover { color: var(--ink); text-decoration: underline; text-decoration-color: var(--signal); }
.data { margin: 0; font: 400 .8125rem/1.5 var(--f-mono); color: var(--ink-2); }
.data a { color: inherit; }
.skip {
  position: absolute; left: var(--gutter); top: -100px; z-index: 50;
  background: var(--ink); color: var(--ground); padding: var(--s-2) var(--s-3); border-radius: var(--r-1);
}
.skip:focus { top: var(--s-2); }

/* Shell */
.shell { min-height: 100vh; }
.col { min-width: 0; padding-inline: var(--gutter); display: flex; flex-direction: column; min-height: calc(100vh - 56px); }
main { flex: 1 0 auto; width: 100%; max-width: var(--col); }
@media (min-width: 1024px) {
  .shell { display: grid; grid-template-columns: var(--side-w) minmax(0, 1fr); }
  .col { min-height: 100vh; padding: 0 var(--s-7) 0 clamp(var(--s-7), 5vw, var(--s-8)); }
}

/* Identity panel */
.side {
  position: sticky; top: 0; z-index: 20; color: var(--side-ink); background-color: var(--side-bg);
  border-bottom: 1px solid var(--side-rule);
  view-transition-name: side;
}
.side a { color: var(--side-ink); }
.side-inner { padding: 10px var(--gutter); }
.side-top { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); }
.side-id { display: inline-flex; align-items: center; gap: var(--s-3); text-decoration: none; min-width: 0; }
.avatar {
  width: 36px; height: 36px; flex: none; display: block; border-radius: var(--r-2);
  box-shadow: 0 0 0 1px var(--side-rule);
}
.handle { font: 800 1.375rem/1 var(--f-display); font-variation-settings: "wdth" 70; letter-spacing: -.01em; }
.side-more { display: none; }
.icon-btn {
  display: grid; place-items: center; width: 34px; height: 34px; padding: 0; cursor: pointer; flex: none;
  background: transparent; border: 1px solid var(--side-rule); border-radius: var(--r-1); color: var(--side-ink-2);
  transition: background-color .15s var(--ease), color .15s var(--ease), transform .12s var(--ease);
}
.icon-btn:hover { background: rgb(255 255 255 / .06); color: var(--side-ink); }
.icon-btn:active { transform: scale(.94); }
.icon-btn .moon { display: none; }
:root[data-theme="dark"] .icon-btn .moon { display: block; }
:root[data-theme="dark"] .icon-btn .sun { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .icon-btn .moon { display: block; }
  :root:not([data-theme]) .icon-btn .sun { display: none; }
}

@media (min-width: 1024px) {
  .side { height: 100vh; overflow-y: auto; border-bottom: 0; border-right: 1px solid var(--side-rule); }
  .side-inner { min-height: 100%; display: flex; flex-direction: column; gap: var(--s-5); padding: var(--s-6) var(--s-6) var(--s-5); }
  .side-top { align-items: flex-start; }
  .side-id { flex-direction: column; align-items: flex-start; gap: var(--s-4); }
  .avatar { width: 88px; height: 88px; }
  .handle { font-size: 2.75rem; line-height: .92; letter-spacing: -.02em; }
  .side-more { display: flex; flex-direction: column; gap: var(--s-5); flex: 1; }
}
.side-role { margin: 0; font: 500 .9375rem/1.4 var(--f-body); color: var(--side-ink-2); }
.side-bio { margin: 0; color: var(--side-ink-2); font-size: .9375rem; line-height: 1.55; }
.side-now { margin: 0; display: grid; gap: var(--s-2); padding-block: var(--s-3); border-block: 1px solid var(--side-rule); }
.side-now div { display: grid; grid-template-columns: 4.5rem 1fr; gap: var(--s-2); align-items: baseline; }
.side-now dt { font: 400 .8125rem/1.4 var(--f-body); color: var(--side-ink-3); }
.side-now dd { margin: 0; font-size: .875rem; color: var(--side-ink); }
.side-now dd a { text-decoration-color: var(--side-signal); }
.side-nav { display: grid; }
.side-nav a, .mnav a { text-decoration: none; }
.side-nav a {
  display: flex; align-items: baseline; gap: var(--s-3); padding: 7px 0 7px var(--s-3);
  border-left: 2px solid transparent; font: 500 1rem/1.3 var(--f-body); color: var(--side-ink-2);
  transition: color .15s var(--ease), border-color .15s var(--ease), padding .15s var(--ease);
}
.side-nav .idx { font: 400 .6875rem/1 var(--f-mono); color: var(--side-ink-3); }
.side-nav a:hover { color: var(--side-ink); border-left-color: var(--side-rule); padding-left: var(--s-4); }
.side-nav a[aria-current="page"] { color: var(--side-ink); border-left-color: var(--side-signal); }
.side-nav a[aria-current="page"] .idx { color: var(--side-signal); }
.side-foot { margin-top: auto; display: grid; gap: var(--s-3); }
.social { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 0 var(--s-4); }
.social a { display: inline-block; padding-block: 6px; font-size: .875rem; color: var(--side-ink-2); text-decoration-color: var(--side-rule); }
.social a:hover { color: var(--side-ink); text-decoration-color: var(--side-signal); }
.side-copy { margin: 0; font: 400 .75rem/1.4 var(--f-mono); color: var(--side-ink-3); }

/* Compact nav (phones and tablets, under the bar) */
.mnav {
  display: flex; gap: var(--s-1) var(--s-4); flex-wrap: wrap; padding-block: var(--s-3);
  border-bottom: 1px solid var(--rule); max-width: var(--col);
}
.mnav a { font: 500 .8125rem/1 var(--f-mono); color: var(--ink-2); padding-block: var(--s-2); border-bottom: 2px solid transparent; }
.mnav .idx { display: none; }
.mnav a:hover { color: var(--ink); border-bottom-color: var(--rule-strong); }
.mnav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--signal); }
@media (min-width: 1024px) { .mnav { display: none; } }

/* Page headings */
.h-page {
  margin: 0; font: 800 clamp(2.5rem, 6vw, 4rem)/.95 var(--f-display);
  font-variation-settings: "wdth" 70; letter-spacing: -.02em;
}
.lead { margin: 0; font-size: clamp(1.0625rem, 1.5vw, 1.1875rem); line-height: 1.55; color: var(--ink-2); max-width: 40em; }

/* Home: a dated log */
.home-head { display: grid; gap: var(--s-3); padding-top: var(--s-7); }
@media (min-width: 1024px) { .home-head { padding-top: var(--s-8); } }
.topics {
  display: flex; flex-wrap: wrap; align-items: baseline; gap: var(--s-2) var(--s-4);
  margin-top: var(--s-5); padding-block: var(--s-3); border-block: 1px solid var(--rule-strong);
}
.topics button, .topics a {
  padding: 4px 0; border: 0; background: none; cursor: pointer; text-decoration: none;
  font: 500 .8125rem/1.3 var(--f-mono); color: var(--ink-2); border-bottom: 2px solid transparent;
}
.topics sup { margin-left: 3px; font-size: .6875rem; color: var(--ink-3); vertical-align: super; line-height: 0; }
.topics button:hover { color: var(--ink); border-bottom-color: var(--rule-strong); }
.topics button[aria-pressed="true"] { color: var(--ink); border-bottom-color: var(--signal); }
.topics a { margin-left: auto; color: var(--signal-ink); }
.topics a:hover { text-decoration: underline; }
.log-wrap { padding-bottom: var(--s-8); }
.year { position: relative; padding-top: var(--s-6); }
.year-num {
  margin: 0 0 var(--s-1); font: 800 clamp(3rem, 7vw, 4.5rem)/.85 var(--f-display); font-variation-settings: "wdth" 70;
  letter-spacing: -.03em; color: transparent; -webkit-text-stroke: 1px var(--rule-strong);
}
.log { margin: 0; padding: 0; list-style: none; }
.log-row {
  display: grid; grid-template-columns: 4.25rem minmax(0, 1fr); gap: 2px var(--s-4); align-items: baseline;
  padding: 11px 0; border-bottom: 1px solid var(--rule); color: var(--ink); text-decoration: none; position: relative;
}
.log li:first-child .log-row { border-top: 1px solid var(--rule); }
.log-date { font: 400 .8125rem/1.4 var(--f-mono); color: var(--ink-3); white-space: nowrap; }
.log-title { font-weight: 500; font-size: 1.0625rem; line-height: 1.4; overflow-wrap: anywhere; }
.log-cat { grid-column: 2; font: 400 .75rem/1.4 var(--f-mono); color: var(--ink-3); }
.log-row:hover .log-title { text-decoration: underline; text-decoration-color: var(--signal); text-decoration-thickness: 2px; text-underline-offset: 4px; }
.log-row:hover .log-date { color: var(--signal-ink); }
@media (min-width: 720px) {
  .log-row { grid-template-columns: 4.25rem minmax(0, 1fr) auto; }
  .log-cat { grid-column: 3; text-align: right; }
}
.log-empty { padding-top: var(--s-5); }

/* Article (post and page) */
.post, .page { padding-block: var(--s-7) var(--s-8); display: grid; gap: var(--s-5); }
@media (min-width: 1024px) { .post, .page { padding-top: var(--s-8); } }
.post-head, .page-head { display: grid; gap: var(--s-3); }
.title {
  margin: 0; font: 800 clamp(2.125rem, 5vw, 3.5rem)/1 var(--f-display);
  font-variation-settings: "wdth" 75; letter-spacing: -.015em; overflow-wrap: anywhere;
}
.post-meta { display: flex; flex-wrap: wrap; gap: var(--s-1) var(--s-4); color: var(--ink-3); }
.post-head { padding-bottom: var(--s-4); border-bottom: 1px solid var(--rule-strong); }
.tags { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: var(--s-1); }
.tags li {
  font: 400 .75rem/1.4 var(--f-mono); color: var(--ink-2);
  padding: 2px 7px; border: 1px solid var(--rule); border-radius: var(--r-1); background: var(--surface);
}

/* Prose */
.prose { max-width: var(--measure); min-width: 0; font-size: 1.0625rem; line-height: 1.7; color: var(--ink); overflow-wrap: break-word; }
.prose--wide { max-width: none; }
.prose > :first-child { margin-top: 0; }
.prose p, .prose ul, .prose ol, .prose pre, .prose table, .prose blockquote, .prose figure { margin: 0 0 1.1em; }
.prose h2, .prose h3, .prose h4 {
  font-family: var(--f-display); font-variation-settings: "wdth" 88; letter-spacing: -.005em; line-height: 1.2;
  margin: 1.9em 0 .55em;
}
.prose h2 { font-size: 1.625rem; font-weight: 700; }
.prose h3 { font-size: 1.3125rem; font-weight: 700; }
.prose h4 { font-size: 1.0625rem; font-weight: 700; }
.prose ul, .prose ol { padding-left: 1.35em; }
.prose li { margin: .25em 0; }
.prose li::marker { color: var(--ink-3); }
.prose strong { font-weight: 600; }
.prose img { display: block; margin: 1.4em 0; border: 1px solid var(--rule); border-radius: var(--r-2); background: var(--surface); }
.prose hr { border: 0; border-top: 1px solid var(--rule-strong); margin: 2.2em 0; }
.prose blockquote { padding: .1em 0 .1em 1em; border-left: 3px solid var(--rule-strong); color: var(--ink-2); }
.prose blockquote > :last-child { margin-bottom: 0; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; font-size: .9375rem; line-height: 1.5; }
.prose th, .prose td { padding: 8px 12px; border: 1px solid var(--rule); text-align: left; vertical-align: top; }
.prose th { background: var(--sunk); font-weight: 600; }
.prose code { font-family: var(--f-mono); font-size: .86em; }
.prose :not(pre) > code { padding: .12em .38em; border-radius: var(--r-1); background: var(--sunk); overflow-wrap: anywhere; }
.prose td > code, .prose th > code { white-space: nowrap; overflow-wrap: normal; }
.prose pre { font-size: .875rem; line-height: 1.6; tab-size: 4; }
.prose pre {
  overflow-x: auto; padding: var(--s-4); border: 1px solid var(--rule); border-radius: var(--r-2);
  background: var(--surface); color: var(--ink);
}
.prose div.highlighter-rouge, .prose figure.highlight { margin: 0 0 1.1em; }
.prose .highlight pre { margin: 0; }
.prose mjx-container { overflow-x: auto; overflow-y: hidden; max-width: 100%; }

/* Rouge */
.highlight .c, .highlight .ch, .highlight .cm, .highlight .c1, .highlight .cs, .highlight .cpf { color: var(--code-com); font-style: italic; }
.highlight .cp { color: var(--code-com); }
.highlight .k, .highlight .kc, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .ow, .highlight .nt { color: var(--code-kw); }
.highlight .kt, .highlight .nc, .highlight .nn, .highlight .bp { color: var(--code-type); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sb, .highlight .sc, .highlight .sd, .highlight .se, .highlight .sh, .highlight .si, .highlight .sx, .highlight .sr, .highlight .ss, .highlight .dl { color: var(--code-str); }
.highlight .m, .highlight .mf, .highlight .mh, .highlight .mi, .highlight .mo, .highlight .il, .highlight .mb, .highlight .mx { color: var(--code-num); }
.highlight .nf, .highlight .fm, .highlight .nd, .highlight .na, .highlight .nb { color: var(--code-fn); }
.highlight .nv, .highlight .vi, .highlight .vg, .highlight .vc, .highlight .no { color: var(--code-type); }
.highlight .gd { color: var(--code-err); }
.highlight .gi { color: var(--code-str); }
.highlight .gh, .highlight .gu { color: var(--ink-3); font-weight: 600; }
.highlight .err { color: var(--code-err); }
.highlight .p, .highlight .o, .highlight .w { color: inherit; }
.highlight .p, .highlight .o, .highlight .w { color: inherit; }

/* Pager and comments */
.pager { display: grid; gap: var(--s-3); margin-top: var(--s-4); max-width: var(--measure); }
@media (min-width: 720px) { .pager { grid-template-columns: 1fr 1fr; } }
.pager-item {
  display: grid; gap: var(--s-1); padding: var(--s-4); border: 1px solid var(--rule-strong); border-radius: var(--r-2);
  background: var(--surface); color: var(--ink); text-decoration: none;
  transition: border-color .15s var(--ease);
}
.pager-item:hover { border-color: var(--ink-3); }
.pager-next { text-align: right; }
.pager-title { font-weight: 500; line-height: 1.4; }
.comments { margin-top: var(--s-5); min-width: 0; max-width: var(--measure); }
.comments-h { margin: 0 0 var(--s-3); padding-top: var(--s-5); border-top: 1px solid var(--rule-strong); font: 700 1.375rem/1.2 var(--f-display); font-variation-settings: "wdth" 88; }

/* Topics page */
.topic-index { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-4); }
.topic-index a { font: 500 .8125rem/1.6 var(--f-mono); color: var(--ink); text-decoration-color: var(--rule-strong); }
.topic-index a:hover { text-decoration-color: var(--signal); }
.topic-index span { color: var(--ink-3); }
.topic { scroll-margin-top: 72px; }
.prose .log { padding: 0; }
.prose .log li { margin: 0; }
.prose .log-row { color: var(--ink); }

/* Projects */
.projects { display: grid; gap: var(--s-6); margin-bottom: var(--s-7); }
.project { display: grid; gap: var(--s-3); align-content: start; padding-top: var(--s-5); border-top: 1px solid var(--rule-strong); }
.project h2 { margin: 0; font-size: 1.5rem; }
.project h2 a { color: var(--ink); text-decoration-color: var(--rule-strong); }
.project h2 a:hover { text-decoration-color: var(--signal); }
.project p { margin: 0; color: var(--ink-2); }
.project .data { color: var(--ink-3); }
.project-text { display: grid; gap: var(--s-3); align-content: start; }
.plate {
  display: block; overflow: hidden; border: 1px solid var(--rule-strong); border-radius: var(--r-2);
  background: var(--surface); transition: border-color .15s var(--ease);
}
.plate:hover { border-color: var(--ink-3); }
.plate img { display: block; width: 100%; margin: 0; border: 0; border-radius: 0; }
@media (min-width: 720px) {
  .projects { grid-template-columns: 1fr 1fr; column-gap: var(--s-6); }
  .project--fig { grid-column: 1 / -1; }
}

/* Footer */
.foot { max-width: var(--col); padding-block: var(--s-5) var(--s-6); border-top: 1px solid var(--rule); }
.foot .data { color: var(--ink-3); }

/* Page swaps: the identity panel stays put, the column cross-fades */
@view-transition { navigation: auto; }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: .18s; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}

/* Touch: every control is at least 44px tall */
@media (pointer: coarse) {
  .mnav a, .topics button, .topics a, .social a, .foot a, .topic-index a { display: inline-flex; align-items: center; min-height: 44px; }
  .mnav { gap: 0 var(--s-5); padding-block: var(--s-1); }
  .icon-btn { width: 44px; height: 44px; }
  .side-id { min-height: 44px; }
  .side-inner { padding-block: 6px; }
}