/* ---------- tokens ---------- */
:root {
  --bg: #FFFFFF;
  --ink: #1B1F24;
  --ink-2: #4B5560;
  --ink-3: #7B8590;
  --line: #E1E5E9;
  --link: #1F5F8B;
  --code-bg: #F5F7F9;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --mono: "Source Code Pro", ui-monospace, Menlo, monospace;
  /* code */
  --c-kw: #8250DF; --c-str: #0A6E4A; --c-fn: #1F5F8B; --c-cm: #7B8590; --c-num: #B35C00; --c-op: #4B5560;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #14171B; --ink: #E4E7EA; --ink-2: #AEB6BE; --ink-3: #7B8590; --line: #2A3037; --link: #7FB4DC; --code-bg: #1B2027;
    --c-kw: #C39CFF; --c-str: #7DCFA5; --c-fn: #7FB4DC; --c-cm: #7B8590; --c-num: #F0B26B; --c-op: #AEB6BE;
  }
}
:root[data-theme="dark"] {
  --bg: #14171B; --ink: #E4E7EA; --ink-2: #AEB6BE; --ink-3: #7B8590; --line: #2A3037; --link: #7FB4DC; --code-bg: #1B2027;
  --c-kw: #C39CFF; --c-str: #7DCFA5; --c-fn: #7FB4DC; --c-cm: #7B8590; --c-num: #F0B26B; --c-op: #AEB6BE;
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--serif); font-size: 18px; line-height: 1.6;
  font-optical-sizing: auto; -webkit-font-smoothing: antialiased;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--link); outline-offset: 2px; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.005em; text-wrap: balance; line-height: 1.25; }
h1 { font-size: 1.75rem; margin-bottom: 20px; }
h2 { font-size: 1.2rem; margin: 2em 0 0.6em; }
h3 { font-size: 1.05rem; margin: 1.6em 0 0.4em; }
h2 + p, h3 + p, h2 + ul, h3 + ul { margin-top: 0; }
p { margin: 0; }
p + p, ul + p, ol + p, p + ul, p + ol, pre + p, figure + p, .katex-display + p, table + p, blockquote + p { margin-top: 1em; }
ul, ol { margin: 0; padding-left: 1.3em; }
li + li { margin-top: 0.25em; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2em 0; }
img { max-width: 100%; height: auto; }
.note, .lede { color: var(--ink-3); }
.lede { font-size: 1.02rem; margin: -8px 0 28px; }
.note { font-size: 0.9rem; font-style: italic; }
blockquote { margin: 1.3em 0; padding: 0 0 0 16px; border-left: 2px solid var(--line); color: var(--ink-2); font-size: 0.97rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 1.3em 0; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 6px 12px 6px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; }
sup, sub { line-height: 0; }
.footnotes { margin-top: 3em; padding-top: 1em; border-top: 1px solid var(--line); font-size: 0.9rem; color: var(--ink-2); }

/* ---------- shell ---------- */
.layout {
  position: relative; z-index: 1; max-width: 1040px; margin: 0 auto; padding: 48px 28px 80px;
  display: grid; grid-template-columns: 190px minmax(0, 660px); column-gap: 72px; align-items: start;
}
main { min-width: 0; padding-top: 6px; }

/* ---------- sidebar ---------- */
.side { position: sticky; top: 48px; }
.side .mark { display: block; width: 64px; margin-bottom: 18px; color: var(--ink-2); }
.side .mark svg { width: 100%; height: auto; display: block; }
.side .mark .e { fill: none; stroke: currentColor; stroke-width: 1.2; stroke-linecap: round; }
.side .mark .e .d { opacity: 0.45; }
.side .mark .n { fill: currentColor; }
.side .mark .n .h { opacity: 0.4; }
.side .name { display: block; font-size: 1.2rem; font-weight: 600; color: var(--ink); line-height: 1.25; }
.side .name:hover { text-decoration: none; }
.side .role { color: var(--ink-3); font-size: 0.88rem; margin-top: 4px; line-height: 1.45; }
.side nav { margin-top: 28px; display: flex; flex-direction: column; gap: 6px; font-size: 1rem; }
.side nav a { color: var(--ink-2); width: fit-content; }
.side nav a[aria-current] { color: var(--ink); font-weight: 600; }
.side .links { margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--line); display: flex; flex-direction: column; gap: 4px; font-size: 0.88rem; }
.side .links a { color: var(--ink-3); width: fit-content; }
.side .links a:hover { color: var(--link); }
.side .theme { margin-top: 20px; background: none; border: 0; padding: 0; color: var(--ink-3); font: inherit; font-size: 0.82rem; cursor: pointer; width: fit-content; }
.side .theme:hover { color: var(--ink); text-decoration: underline; }

/* ---------- home ---------- */
.molecular-landscape {
  position: absolute; inset: 0 0 auto; height: 700px; overflow: hidden;
  pointer-events: none; user-select: none; color: var(--ink-3);
  -webkit-mask-image: linear-gradient(to bottom, #000 65%, transparent);
  mask-image: linear-gradient(to bottom, #000 65%, transparent);
}
.molecular-landscape svg {
  position: absolute; top: -24px; left: calc(50% + 140px); width: 760px; height: 700px;
  -webkit-mask-image: linear-gradient(to right, transparent 8%, #000 42%);
  mask-image: linear-gradient(to right, transparent 8%, #000 42%);
}
.molecular-landscape .contours { fill: none; stroke: currentColor; stroke-width: 0.85; opacity: 0.22; }
.molecular-landscape .samples { fill: currentColor; opacity: 0.3; }
.molecular-landscape .trajectory { fill: none; stroke: var(--link); stroke-width: 1.3; stroke-dasharray: 2 7; opacity: 0.45; }
.molecular-landscape .waypoints { fill: var(--bg); stroke: var(--link); stroke-width: 1.1; opacity: 0.55; }
.molecular-landscape .molecules { color: var(--ink-2); opacity: 0.35; }
.molecular-landscape .bonds { fill: none; stroke: currentColor; stroke-width: 1.25; }
.molecular-landscape .atoms { fill: currentColor; font: 11px var(--mono); }
.photo { float: right; width: 150px; margin: 4px 0 12px 28px; border-radius: 3px; shape-outside: margin-box; }
.photo img { display: block; width: 100%; border-radius: 3px; }

/* ---------- timeline ---------- */
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { display: grid; grid-template-columns: 76px 1fr; gap: 16px; margin: 0; padding: 0 0 18px; position: relative; }
.timeline li + li { margin-top: 0; }
.timeline .when { color: var(--ink-3); font-size: 0.9rem; padding-top: 2px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.timeline li > div:last-child { position: relative; padding-left: 18px; border-left: 1px solid var(--line); }
.timeline li:last-child > div:last-child { border-left-color: transparent; }
.timeline li > div:last-child::before { content: ""; position: absolute; left: -4px; top: 0.55em; width: 7px; height: 7px; border-radius: 50%; background: var(--ink-3); }
.timeline li:first-child > div:last-child::before { background: var(--ink); }
.timeline .what { font-weight: 600; }
.timeline .where { font-weight: 400; color: var(--ink-3); }
.timeline .where::before { content: "·"; margin: 0 8px; }
.timeline .detail { color: var(--ink-2); font-size: 0.95rem; margin-top: 2px; }

/* ---------- blog index ---------- */
.year { color: var(--ink-3); font-size: 0.9rem; margin: 2em 0 0.4em; padding-bottom: 6px; border-bottom: 1px solid var(--line); }
h1 + .year, .lede + .year { margin-top: 0; }
.posts { list-style: none; margin: 0; padding: 0; }
.posts li { display: grid; grid-template-columns: 76px 1fr; gap: 16px; padding: 9px 0; margin: 0; }
.posts time { color: var(--ink-3); font-size: 0.9rem; padding-top: 2px; font-variant-numeric: tabular-nums; }
.posts .d { color: var(--ink-2); font-size: 0.95rem; }

/* ---------- publications ---------- */
.pubs { list-style: none; margin: 0; padding: 0; }
.pubs li { padding: 10px 0; margin: 0; }
.pubs li + li { border-top: 1px solid var(--line); }
.pubs .a { color: var(--ink-2); font-size: 0.95rem; }
.pubs .v { color: var(--ink-3); font-size: 0.9rem; font-style: italic; }
.pubs .v a { font-style: normal; margin-left: 8px; font-size: 0.88rem; }

/* ---------- posts ---------- */
article .meta { color: var(--ink-3); font-size: 0.9rem; display: flex; gap: 14px; flex-wrap: wrap; }
article .tags span + span::before { content: "·"; margin: 0 6px; }
article h1 { margin: 6px 0 24px; }
.postnav { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; gap: 16px; font-size: 0.92rem; }

.katex { font-size: 1.05em; }
.katex-display { margin: 1.2em 0; overflow-x: auto; overflow-y: hidden; padding: 2px 0; }
.katex-display > .katex { white-space: normal; }

code { font-family: var(--mono); font-size: 0.85em; }
p code, li code, td code { background: var(--code-bg); padding: 1px 5px; border-radius: 3px; }
div.highlighter-rouge { position: relative; margin: 1.3em 0; }
div.highlighter-rouge pre.highlight, pre {
  margin: 0; padding: 14px 16px; background: var(--code-bg); border: 1px solid var(--line); border-radius: 4px;
  overflow-x: auto; font-family: var(--mono); font-size: 0.8rem; line-height: 1.6;
}
pre code { font-size: inherit; background: none; padding: 0; }
.copy {
  position: absolute; top: 8px; right: 8px; background: var(--bg); color: var(--ink-3); border: 1px solid var(--line); border-radius: 3px;
  font: 500 0.68rem var(--mono); letter-spacing: 0.04em; padding: 3px 8px; cursor: pointer; opacity: 0; transition: opacity 120ms;
}
div.highlighter-rouge:hover .copy, .copy:focus-visible { opacity: 1; }
.copy:hover { color: var(--ink); }

/* Rouge token colors */
.highlight .k, .highlight .kd, .highlight .kn, .highlight .kp, .highlight .kr, .highlight .kt, .highlight .ow { color: var(--c-kw); }
.highlight .s, .highlight .s1, .highlight .s2, .highlight .sd, .highlight .sb, .highlight .sh, .highlight .si, .highlight .se, .highlight .sr, .highlight .ss, .highlight .sx { color: var(--c-str); }
.highlight .c, .highlight .c1, .highlight .cm, .highlight .cp, .highlight .cs { color: var(--c-cm); font-style: italic; }
.highlight .nf, .highlight .fm, .highlight .nc, .highlight .nn, .highlight .nd { color: var(--c-fn); }
.highlight .m, .highlight .mi, .highlight .mf, .highlight .mh, .highlight .mo, .highlight .il { color: var(--c-num); }
.highlight .o, .highlight .p { color: var(--c-op); }
.highlight .bp, .highlight .nb { color: var(--ink); }
.highlight .err { color: inherit; background: none; }

figure { margin: 1.5em 0; }
figure img { display: block; margin: 0 auto; border-radius: 3px; }
figcaption { color: var(--ink-3); font-size: 0.9rem; margin-top: 8px; text-align: center; }
.embed { margin: 1.5em 0; border: 1px solid var(--line); border-radius: 3px; overflow: hidden; }
.embed iframe { display: block; width: 100%; border: 0; }

/* ---------- small screens ---------- */
@media (max-width: 760px) {
  body { font-size: 17px; }
  .layout { grid-template-columns: 1fr; row-gap: 32px; padding: 32px 20px 64px; }
  .side { position: static; }
  .side nav { flex-direction: row; flex-wrap: wrap; gap: 6px 18px; margin-top: 16px; }
  .side .links { flex-direction: row; flex-wrap: wrap; gap: 4px 16px; }
  .side .mark { width: 52px; margin-bottom: 12px; }
  .molecular-landscape {
    height: 300px; opacity: 0.75;
    -webkit-mask-image: linear-gradient(to bottom, #000 35%, transparent);
    mask-image: linear-gradient(to bottom, #000 35%, transparent);
  }
  .molecular-landscape svg { left: auto; right: -270px; top: -40px; width: 640px; height: auto; }
  .photo { width: 120px; margin-left: 20px; }
  .posts li { grid-template-columns: 1fr; gap: 2px; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
  .timeline li > div:last-child { border-left: 0; padding-left: 0; }
  .timeline li > div:last-child::before { display: none; }
  .copy { opacity: 1; }
}