/* =====================================================================
   Riccardo Marin — website26
   Colours live in the tokens below. Light is the default theme;
   dark is used when the visitor clicks the "dark" toggle.
   To switch to the viridis palette, set data-palette="gradient" on <html>.
   ===================================================================== */

/* ---------- Colour tokens ---------- */
:root {
  --bg: #fbfaf6; --fg: #1b1a18; --muted: #6b6862; --rule: #dcd8cf; --plate: #fbfaf6;
  /* single accent (Okabe–Ito blue) and its 8-step ramp for figures */
  --accent: #0072B2;
  --c0: #a6cbe5; --c1: #86b8dc; --c2: #63a2d0; --c3: #3f8cc3;
  --c4: #1e76b4; --c5: #0d629c; --c6: #0a5082; --c7: #083f68;
}
:root[data-theme="dark"] {
  --bg: #141413; --fg: #e8e5de; --muted: #9c988f; --rule: #3a3834; --plate: #141413;
  --accent: #6cc0ee;
  --c0: #2c5d80; --c1: #3a7098; --c2: #4983ad; --c3: #5c97c2;
  --c4: #72abd4; --c5: #8cbfe2; --c6: #a9d2ee; --c7: #c9e4f7;
}
/* optional viridis palette */
:root[data-palette="gradient"] {
  --accent: #1c7480;
  --c0: #440154; --c1: #482878; --c2: #3e4989; --c3: #31688e;
  --c4: #26828e; --c5: #1f9e89; --c6: #35b779; --c7: #6ece58;
}
:root[data-palette="gradient"][data-theme="dark"] {
  --accent: #5cc88a;
  --c0: #414487; --c1: #355f8d; --c2: #2a788e; --c3: #21918c;
  --c4: #22a884; --c5: #44bf70; --c6: #7ad151; --c7: #fde725;
}
:root { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

/* ---------- Base typography ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: "EB Garamond", Garamond, "Times New Roman", serif;
  font-size: 20px; line-height: 1.5;
  font-variant-numeric: oldstyle-nums proportional-nums;
  font-feature-settings: "kern", "liga", "onum";
  text-rendering: optimizeLegibility; hanging-punctuation: first;
}
main { max-width: 46rem; margin: 0 auto; padding: 3.5rem 1rem 5rem; }
a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
p:not(.contact) a, .links a, .nav a, .posts a, .terms a, .post-body a, .back a {
  text-decoration: underline; text-decoration-thickness: 1px;
  text-underline-offset: .18em; text-decoration-color: var(--accent);
}
h1, h2, h3 { font-weight: 500; margin: 0; }
p { margin: 0 0 .9em; hyphens: auto; }
abbr, .sc { font-variant-caps: all-small-caps; letter-spacing: .04em; text-decoration: none; }
section { margin-top: 3.2rem; }
h2 { font-size: 1rem; font-variant-caps: all-small-caps; letter-spacing: .12em; color: var(--muted); margin-bottom: 1.4rem; }

/* ---------- Header ---------- */
header.top { display: grid; grid-template-columns: 1fr 8rem; gap: 2rem; align-items: start; }
h1 { font-size: 2.6rem; line-height: 1.05; letter-spacing: -.005em; margin-bottom: .6rem; }
.intro { font-size: 1.05rem; }
.contact { margin-top: .8rem; display: flex; flex-wrap: wrap; gap: .35rem 1.05rem; }
.contact a { color: var(--muted); text-decoration: none; display: inline-flex; padding: .15rem 0; }
.contact a:hover { color: var(--accent); }
.icon { width: 1.15rem; height: 1.15rem; fill: currentColor; display: block; }
/* menu, top right */
.nav { display: flex; justify-content: flex-end; align-items: baseline; flex-wrap: wrap; gap: .2rem 1.2em;
  margin: -1.5rem 0 2.5rem; font-size: 1.02rem; font-variant-caps: all-small-caps; letter-spacing: .06em; }
.nav .theme-toggle { margin-left: .4em; padding-left: 1.1em; border-left: 1px solid var(--rule); font-size: 1.02rem; }
.photo { width: 100%; aspect-ratio: 1; object-fit: cover; object-position: 50% 28%; border-radius: 50%; display: block; }
.theme-toggle {
  font: inherit; font-size: .85rem; font-variant-caps: all-small-caps; letter-spacing: .08em;
  color: var(--muted); background: none; border: 0; padding: .2rem 0; cursor: pointer;
}
.theme-toggle:hover { color: var(--accent); }

/* ---------- Eigenfunction dividers (drawn by site.js) ---------- */
.eig { display: block; width: 100%; height: 14px; margin-bottom: .9rem; overflow: visible; }
.eig polyline { fill: none; stroke: var(--accent); stroke-width: 1; vector-effect: non-scaling-stroke; opacity: .75; }
:root[data-palette="gradient"] .eig polyline { stroke: url(#viridis); opacity: 1; }

/* ---------- Publications & teaching ---------- */
.pub { display: grid; grid-template-columns: 11rem minmax(0, 1fr); gap: 1.4rem; margin-bottom: 2rem; align-items: start; }
.pub > * { min-width: 0; }
.thumb { display: block; aspect-ratio: 16 / 10; overflow: hidden; background: #fff; border-radius: 2px; }
.thumb img, .thumb video { width: 100%; height: 100%; object-fit: contain; display: block; }
.pub h3 { font-size: 1.08rem; line-height: 1.3; margin-bottom: .25rem; }
.pub h3 a:hover { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .18em; }
.pub p { margin: 0 0 .15rem; font-size: .92rem; line-height: 1.4; }
.authors { color: var(--muted); }
.me { color: var(--fg); font-weight: 500; }
.note { font-variant-caps: all-small-caps; letter-spacing: .06em; color: var(--accent); margin-left: .55em; white-space: nowrap; }
.note + .note::before { content: "· "; color: var(--muted); }
.tldr { margin-top: .35rem !important; }
.links { font-variant-caps: all-small-caps; letter-spacing: .05em; }
.links a { margin-right: .7em; }
.links button { font: inherit; letter-spacing: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer;
  text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .18em; text-decoration-color: var(--accent); }
.links button:hover { color: var(--accent); }
/* BibTeX box under a publication */
.bib { position: relative; margin: .5rem 0 .2rem; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.bib pre { margin: 0; padding: .7rem 4.5rem .7rem 0; white-space: pre-wrap; overflow-wrap: anywhere; font-size: .74rem; line-height: 1.45; color: var(--fg);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-variant-numeric: normal; }
.bib .copy { position: absolute; top: .35rem; right: 0; font: inherit; font-size: .85rem; font-variant-caps: all-small-caps;
  letter-spacing: .06em; color: var(--muted); background: var(--bg); border: 1px solid var(--rule); border-radius: 2px;
  padding: 0 .45em; cursor: pointer; }
.bib .copy:hover { color: var(--accent); border-color: var(--accent); }
.terms { color: var(--muted); }
.course .thumb { border: 1px solid var(--rule); background: var(--bg); }
.thumb-svg { width: 100%; height: 100%; display: block; }
.thumb-svg .plate { fill: var(--plate); }
.thumb-svg text { font-family: "EB Garamond", serif; font-size: 17px; fill: var(--fg); letter-spacing: .08em; }
.c0 { fill: var(--c0); } .c1 { fill: var(--c1); } .c2 { fill: var(--c2); } .c3 { fill: var(--c3); }
.c4 { fill: var(--c4); } .c5 { fill: var(--c5); } .c6 { fill: var(--c6); } .c7 { fill: var(--c7); }
.more { font-size: .92rem; }

/* ---------- Blog list ---------- */
.posts { list-style: none; padding: 0; margin: 0 0 .5rem; }
.posts li { display: grid; grid-template-columns: 8.5rem 1fr; column-gap: 1.4rem; margin-bottom: .6rem; }
.posts a { justify-self: start; }
.posts time { color: var(--muted); }
.posts .sub { grid-column: 2; color: var(--muted); font-style: italic; font-size: .92rem; }

/* ---------- Single blog post (post.html) ---------- */
.post-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 3rem; }
.back { font-variant-caps: all-small-caps; letter-spacing: .06em; }
.post-title { font-size: 2.2rem; line-height: 1.12; margin-bottom: .4rem; }
.post-sub { font-style: italic; color: var(--muted); font-size: 1.1rem; margin-bottom: .3rem; }
.post-date { color: var(--muted); font-size: .92rem; margin-bottom: 2rem; }
.post-date + .lang-note { margin-top: -1.4rem; }
.lang-note { color: var(--muted); font-size: .92rem; margin-bottom: 2rem; }
.lang-switch { white-space: nowrap; margin-left: .3em; }
.lang-switch button {
  font: inherit; font-variant-caps: all-small-caps; letter-spacing: .06em; color: var(--fg);
  background: none; border: 0; padding: 0; cursor: pointer;
  text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .18em; text-decoration-color: var(--accent);
}
.lang-switch button:hover { color: var(--accent); }
.lang-switch button[aria-pressed="true"] { color: var(--muted); text-decoration: none; cursor: default; }
.langs { font-variant-caps: all-small-caps; letter-spacing: .06em; color: var(--muted); margin-left: .6em; font-size: .92rem; }
.post-body h2 { font-size: 1.35rem; font-variant-caps: normal; letter-spacing: 0; color: var(--fg); margin: 2rem 0 .8rem; }
.post-body h3 { font-size: 1.12rem; margin: 1.6rem 0 .6rem; }
.post-body img { max-width: 100%; height: auto; }
.post-body blockquote { margin: 1.2rem 0; padding-left: 1rem; border-left: 1px solid var(--accent); color: var(--muted); font-style: italic; }
.post-body code { font-size: .88em; }
.post-body pre { overflow-x: auto; font-size: .85rem; line-height: 1.45; padding: .8rem 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }

/* ---------- Gradient palette: links underlined with viridis ---------- */
:root[data-palette="gradient"] :is(p:not(.contact) a, .links a, .nav a, .posts a, .terms a, .post-body a, .back a) {
  text-decoration: none; background-image: linear-gradient(90deg, var(--c1), var(--c4), var(--c7));
  background-size: 100% 1px; background-repeat: no-repeat; background-position: 0 92%;
}

/* ---------- Footer & misc ---------- */
footer { margin-top: 4rem; padding-top: 1rem; border-top: 1px solid var(--rule); color: var(--muted); font-size: .85rem; }
.error { color: var(--muted); font-style: italic; font-size: .92rem; }

/* ---------- Phones ---------- */
@media (max-width: 640px) {
  body { font-size: 18px; }
  main { padding-top: 2rem; }
  header.top { grid-template-columns: 1fr 5.5rem; gap: 1rem; }
  .nav { margin: -.5rem 0 1.8rem; gap: .2rem .9em; }
  h1 { font-size: 2rem; }
  .pub { grid-template-columns: 1fr; gap: .7rem; }
  .posts li { grid-template-columns: 1fr; }
  .posts .sub { grid-column: 1; }
  .post-title { font-size: 1.8rem; }
}