:root {
  --font-serif: "Source Serif 4", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --font-sans: "Source Sans 3", "Segoe UI", system-ui, sans-serif;
  --page: 90rem;
  --gutter: 2.25rem;
  --header-h: 3.6rem;
}

:root,
[data-theme="light"] {
  --bg: #f4f1ea;
  --bg-raised: #fffdf8;
  --text: #1c1b18;
  --muted: #6a655c;
  --faint: #9a9488;
  --stroke: #ddd6c8;
  --accent: #1f4f8a;
  --accent-hover: #163a68;
  --link: #1f4f8a;
  --chip: #ebe6dc;
  --cover-bg: #e7e1d4;
}

[data-theme="dark"] {
  --bg: #141413;
  --bg-raised: #1c1c1a;
  --text: #ece7dc;
  --muted: #9c968a;
  --faint: #6f6a61;
  --stroke: #2c2b28;
  --accent: #8bb6e3;
  --accent-hover: #b3d0ef;
  --link: #8bb6e3;
  --chip: #242320;
  --cover-bg: #242320;
}

* { box-sizing: border-box; }

html {
  color-scheme: light dark;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.7;
  font-optical-sizing: auto;
}

img { max-width: 100%; display: block; }

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 1rem;
  top: 1rem;
  background: var(--bg-raised);
  padding: 0.4rem 0.7rem;
  z-index: 10;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--header-h);
  padding: 0.6rem max(var(--gutter), calc((100% - var(--page)) / 2));
  background: var(--bg);
  border-bottom: 1px solid var(--stroke);
  font-family: var(--font-sans);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem 1.6rem;
  flex: 1;
}

.nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 0.35rem 0 0.45rem;
  border-bottom: 2px solid transparent;
}

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

.nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.subnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 1.4rem;
  margin: 0 0 1.6rem;
  border-bottom: 1px solid var(--stroke);
  font-family: var(--font-sans);
}

.subnav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.2rem 0 0.55rem;
  margin-bottom: -1px;
  border-bottom: 2px solid transparent;
}

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

.subnav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-left: auto;
}

.subscribe {
  display: inline-flex;
  align-items: center;
  height: 2.1rem;
  padding: 0 0.85rem;
  border: 1px solid var(--text);
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.subscribe:hover {
  background: var(--text);
  color: var(--bg);
}

.theme-toggle {
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  border: 1px solid var(--stroke);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
}

.theme-toggle svg {
  width: 0.95rem;
  height: 0.95rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.theme-toggle .icon-moon {
  fill: currentColor;
  stroke: none;
}

[data-theme="light"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: none; }

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

/* Layout */

.wrap {
  width: min(var(--page), calc(100% - 2 * var(--gutter)));
  margin: 0 auto;
  padding: 2.75rem 0 5rem;
}

.wrap:has(.subnav) {
  padding-top: 0.35rem;
}

.wrap.wide {
  width: min(var(--page), calc(100% - 2 * var(--gutter)));
}

.home-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(13rem, 18rem);
  gap: 3.5rem;
  align-items: start;
}

.home-intro {
  min-width: 0;
}

.home-contact {
  min-width: 0;
  margin-top: 0.2rem;
}

.home-contact .subhead {
  margin-top: 1.35rem;
}

.contact-links {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.05rem;
}

.contact-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text);
  text-decoration: none;
}

.contact-links a:hover {
  color: var(--accent);
}

.contact-links svg {
  width: 1.1rem;
  height: 1.1rem;
  fill: currentColor;
  flex-shrink: 0;
}

.home-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 3.5rem;
  margin-top: 3rem;
}

.home-cols .section {
  margin-top: 0;
}

.home-cols .now-read {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem 0.85rem;
}

h1, h2, h3 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin: 0 0 1.25rem;
}

.prose p { margin: 0 0 1.05rem; }
.prose p:last-child { margin-bottom: 0; }

.section {
  margin-top: 2.75rem;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--stroke);
  padding-bottom: 0.4rem;
}

.section-head h2 {
  font-size: 1.15rem;
  margin: 0;
}

.section-head a {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
}

.subhead {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 1.15rem 0 0.45rem;
}

.section-head + .subhead {
  margin-top: 0.35rem;
}

.thought-stars {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin: 0 0 1.85rem;
}

.thought-stars article {
  padding: 0.95rem 1.05rem 1rem;
  background: var(--bg-raised);
  border: 1px solid var(--stroke);
}

.thought-stars h3 {
  margin: 0;
  font-size: 1.28rem;
  line-height: 1.3;
}

.thought-stars h3 a {
  color: var(--text);
  text-decoration: none;
}

.thought-stars h3 a:hover { color: var(--accent); }

.thought-stars .where {
  margin: 0.3rem 0 0;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--muted);
}

.thought-stars .kind {
  color: var(--accent);
}

.thought-recent {
  font-size: 0.98rem;
}

.thought-recent li {
  padding: 0.4rem 0;
}

.thought-recent .feed-title,
.thought-recent .feed-main a {
  color: var(--muted);
}

.thought-recent .feed-main a:hover {
  color: var(--accent);
}

.lede {
  color: var(--muted);
  margin: 0 0 1.25rem;
  font-size: 1.05rem;
}

.empty {
  margin: 2rem 0 0;
  padding: 2.75rem 1.5rem;
  border: 1px solid var(--stroke);
  color: var(--muted);
  text-align: center;
  font-size: 1.05rem;
}

/* Lists */

.feed {
  list-style: none;
  margin: 0;
  padding: 0;
}

.feed li {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr) auto;
  align-items: start;
  gap: 0.75rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--stroke);
}

.feed time,
.feed .meta {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--faint);
}

.feed li > a { color: var(--text); text-decoration: none; }
.feed li > a:hover { color: var(--accent); }

.feed-main {
  min-width: 0;
}

.feed-main a {
  color: var(--text);
  text-decoration: none;
}

.feed-main a:hover { color: var(--accent); }

.feed-title {
  min-width: 0;
}

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

.source {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  text-decoration: none;
  width: 1.15rem;
  height: 1.15rem;
}

.source:hover { color: var(--accent); }

.source svg {
  width: 1.05rem;
  height: 1.05rem;
  display: block;
  fill: currentColor;
}

.source-dev {
  width: auto;
  height: 1.15rem;
  padding: 0 0.3rem;
  border: 1.5px solid currentColor;
  border-radius: 0.22rem;
  font-family: var(--font-sans);
  font-size: 0.58rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1;
}

/* Experiments */

.experiment {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--stroke);
}

.experiment.star {
  padding: 0.35rem 0 1.7rem;
}

.experiment.star h2 {
  margin: 0 0 0.45rem;
  font-size: 1.85rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.experiment.star h2 a { color: var(--text); text-decoration: none; }
.experiment.star h2 a:hover { color: var(--accent); }

.experiment.star p {
  font-size: 1.08rem;
  max-width: 40rem;
}

.experiment h3 {
  margin: 0 0 0.25rem;
  font-size: 1.2rem;
}

.experiment h3 a { color: var(--text); text-decoration: none; }
.experiment h3 a:hover { color: var(--accent); }

.experiment .status {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
}

.experiment p {
  margin: 0 0 0.5rem;
  color: var(--muted);
}

.experiment .more {
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

/* Reading */

.now-read {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem 1.25rem;
}

.kind {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 0.2rem;
}

.rec-grid,
.cover-grid {
  display: grid;
  gap: 1.5rem 1.25rem;
}

.rec-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  margin-bottom: 0.25rem;
}

.cover-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.book {
  color: inherit;
  text-decoration: none;
  min-width: 0;
}

.book:hover { color: inherit; }

.cover {
  aspect-ratio: 2 / 3;
  background: var(--cover-bg);
  overflow: hidden;
  margin-bottom: 0.55rem;
}

.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover.fallback {
  display: grid;
  place-items: center;
  padding: 0.75rem;
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--muted);
}

.cover.fallback img { display: none; }

.book .title {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.3;
  font-weight: 600;
  color: var(--text);
}

.book .author {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.book .why {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 0.35rem;
  line-height: 1.45;
}

.paper-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.paper-list li {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--stroke);
}

.paper-list h3 {
  font-size: 1.02rem;
  margin: 0 0 0.2rem;
}

.paper-list p {
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}

.note-item {
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--stroke);
}

.note-item .meta {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  color: var(--faint);
  margin-bottom: 0.2rem;
}

.note-item h3 {
  font-size: 1.05rem;
  margin: 0 0 0.25rem;
  font-weight: 600;
}

.note-item p {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.talk {
  padding: 1rem 0;
  border-bottom: 1px solid var(--stroke);
}

.talk h3 { margin: 0 0 0.2rem; font-size: 1.15rem; }
.talk .where {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--faint);
  margin-bottom: 0.35rem;
}
.talk p { margin: 0; color: var(--muted); }
.talk p + p { margin-top: 0.5rem; }
.talk .more {
  font-family: var(--font-sans);
  font-size: 0.85rem;
}

footer {
  border-top: 1px solid var(--stroke);
  padding: 1.25rem max(var(--gutter), calc((100% - var(--page)) / 2)) 2rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
}

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

@media (max-width: 1100px) {
  .cover-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .home-top,
  .home-cols { grid-template-columns: 1fr; gap: 2.25rem; }
  .contact-links {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.45rem 1.25rem;
  }
  .rec-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .cover-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .site-header {
    flex-wrap: wrap;
    padding: 0.7rem var(--gutter);
  }
  .nav { order: 3; flex-basis: 100%; }
  .wrap, .wrap.wide { width: calc(100% - 2 * var(--gutter)); padding-top: 2rem; }
  .wrap:has(.subnav) { padding-top: 0.25rem; }
  footer { padding-inline: var(--gutter); }
  .feed li {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }
  .feed time { grid-column: 1; }
  .feed li > a,
  .feed-title { grid-column: 1; }
  .sources { grid-column: 2; grid-row: 1 / span 2; align-self: center; }
  .rec-grid, .cover-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 420px) {
  .rec-grid, .cover-grid { grid-template-columns: 1fr 1fr; }
}