/* David Nganga – site styles */
:root{color-scheme:light;padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}body{margin:0}img{max-width:100%}[hidden]{display:none!important}

/* Layout: a hazy-sky hero with drifting particles sized by real PM bins, then a single reading column with a mono margin rail for dates and units. */
:root {
  --sky: #e9eef0;
  --paper: #f6f8f8;
  --ink: #16242c;
  --muted: #56666e;
  --line: #cbd5d8;
  --accent: #b5651d;
  --cool: #2f6b7d;
  --particle: 22, 36, 44;
  --display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --body: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --sky: #0f1a20; --paper: #131f26; --ink: #e4ecee; --muted: #93a4ab;
    --line: #2a3a42; --accent: #e09a52; --cool: #7fb7c7; --particle: 210, 228, 234;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --sky: #0f1a20; --paper: #131f26; --ink: #e4ecee; --muted: #93a4ab;
  --line: #2a3a42; --accent: #e09a52; --cool: #7fb7c7; --particle: 210, 228, 234;
  color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  background: var(--paper); color: var(--ink);
  font-family: var(--body); font-size: 1.0625rem; line-height: 1.6;
}
a { color: var(--cool); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

/* Nav */
.nav {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px); border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0.7rem 20px;
  display: flex; gap: 1rem; align-items: center; justify-content: space-between; flex-wrap: wrap;
}
.mark { font-family: var(--display); font-weight: 800; text-decoration: none; color: var(--ink); letter-spacing: -0.01em; }
.links { display: flex; gap: 1.1rem; flex-wrap: wrap; font-family: var(--mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; }
.links a { color: var(--muted); text-decoration: none; }
.links a:hover { color: var(--accent); }

/* Hero */
.hero { position: relative; background: var(--sky); overflow: hidden; border-bottom: 1px solid var(--line); }
#haze { position: absolute; inset: 0; width: 100%; height: 100%; }
.hero-inner { position: relative; max-width: 1080px; margin: 0 auto; padding: 4.5rem 20px 3.5rem; }
.eyebrow { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); margin: 0 0 1.2rem; }
h1 {
  font-family: var(--display); font-weight: 800; font-size: clamp(2.8rem, 9vw, 6.2rem);
  line-height: 0.95; letter-spacing: -0.035em; margin: 0; text-wrap: balance;
}
h1 span { color: var(--cool); }
.lede { max-width: 36rem; font-size: clamp(1.1rem, 2.4vw, 1.3rem); margin: 1.6rem 0 0; }
.lede em { color: var(--accent); font-style: italic; }
.hero-meta { margin-top: 2rem; display: flex; gap: 0.6rem 1.6rem; flex-wrap: wrap; font-family: var(--mono); font-size: 0.8rem; color: var(--muted); }
.cta { margin-top: 2rem; display: flex; gap: 0.8rem; flex-wrap: wrap; }
.btn {
  font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 0.75rem 1.1rem; border: 1px solid var(--ink); color: var(--ink); text-decoration: none; background: transparent; cursor: pointer;
}
.btn.solid { background: var(--ink); color: var(--paper); }
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn.solid:hover { background: var(--accent); color: var(--paper); }
.legend { margin-top: 2.6rem; font-family: var(--mono); font-size: 0.7rem; color: var(--muted); display: flex; gap: 1rem; flex-wrap: wrap; align-items: center; }
.legend i { display: inline-block; border-radius: 50%; background: rgb(var(--particle)); vertical-align: middle; margin-right: 0.35rem; }

/* Sections */
main { max-width: 1080px; margin: 0 auto; padding-inline: 20px; }
section { display: grid; grid-template-columns: 200px minmax(0, 1fr); gap: 2rem; padding-block: 4rem; border-bottom: 1px solid var(--line); }
section:last-of-type { border-bottom: 0; }
.rail { font-family: var(--mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.rail b { display: block; color: var(--accent); font-weight: 500; margin-bottom: 0.3rem; }
h2 { font-family: var(--display); font-weight: 600; font-size: clamp(1.7rem, 4vw, 2.4rem); letter-spacing: -0.02em; line-height: 1.1; margin: 0 0 1.2rem; text-wrap: balance; }
h3 { font-family: var(--display); font-weight: 600; font-size: 1.2rem; margin: 0; line-height: 1.3; }
.prose { max-width: 40rem; }
.prose p { margin: 0 0 1rem; }
.content { min-width: 0; }

/* Research themes */
.themes { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 1.5rem 2rem; margin-top: 2rem; }
.theme { border-top: 2px solid var(--ink); padding-top: 0.9rem; }
.theme .unit { font-family: var(--mono); font-size: 0.75rem; color: var(--accent); display: block; margin-bottom: 0.4rem; }
.theme p { margin: 0.5rem 0 0; color: var(--muted); font-size: 0.98rem; }

/* Filter strip: one gravimetric filter per publication year */
.filters { display: flex; gap: 0.9rem; margin: 0 0 2rem; flex-wrap: wrap; align-items: flex-end; }
.filter { text-align: center; font-family: var(--mono); font-size: 0.7rem; color: var(--muted); }
.filter span { display: block; width: 38px; height: 38px; border-radius: 50%; border: 1px solid var(--line); margin: 0 auto 0.35rem; transition: transform .15s, border-color .15s; }
a.filter { text-decoration: none; cursor: pointer; }
a.filter:hover span, a.filter.on span { border-color: var(--accent); transform: scale(1.08); }
a.filter:hover, a.filter.on { color: var(--accent); }
.pub { scroll-margin-top: 5rem; transition: background-color .3s; }
.pub.hl { background: color-mix(in srgb, var(--accent) 10%, transparent); outline: 6px solid color-mix(in srgb, var(--accent) 10%, transparent); }
@media (prefers-reduced-motion: reduce) { .filter span, .pub { transition: none; } }

/* Publications */
.pubs { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.6rem; }
.pub { display: grid; grid-template-columns: 3.5rem minmax(0, 1fr); gap: 1rem; }
.pub .yr { font-family: var(--mono); font-size: 0.85rem; color: var(--accent); padding-top: 0.15rem; }
.pub h3 { font-size: 1.12rem; }
.pub .auth { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.95rem; }
.pub .auth strong { color: var(--ink); font-weight: 600; }
.pub .venue { margin: 0.2rem 0 0; font-style: italic; font-size: 0.95rem; }
.pub a.doi { font-family: var(--mono); font-size: 0.75rem; word-break: break-all; }

/* Timeline */
.timeline { list-style: none; padding: 0; margin: 0; display: grid; gap: 1.8rem; }
.timeline li { display: grid; grid-template-columns: 8.5rem minmax(0, 1fr); gap: 1rem; }
.when { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); padding-top: 0.2rem; font-variant-numeric: tabular-nums; }
.timeline p { margin: 0.35rem 0 0; color: var(--muted); font-size: 0.98rem; }
.where { font-family: var(--mono); font-size: 0.75rem; color: var(--cool); text-transform: uppercase; letter-spacing: 0.06em; }

.split { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 2.5rem; }
.sub { font-family: var(--mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--accent); margin: 0 0 1rem; }

.tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0; padding: 0; list-style: none; }
.tags li { font-family: var(--mono); font-size: 0.75rem; padding: 0.35rem 0.6rem; border: 1px solid var(--line); color: var(--ink); }

/* Contact */
.contact-row { display: flex; flex-wrap: wrap; gap: 0.8rem; align-items: center; margin-top: 1.2rem; }
.email { font-family: var(--mono); font-size: clamp(0.95rem, 3vw, 1.25rem); color: var(--ink); user-select: all; word-break: break-all; }
.contacts { margin: 1.4rem 0 0; display: grid; gap: 1.1rem; }
.contacts dt { font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
.contacts dd { margin: 0.2rem 0 0; display: flex; gap: 0.9rem; align-items: baseline; flex-wrap: wrap; min-width: 0; }
.contacts a.email { text-decoration: none; font-variant-numeric: tabular-nums; }
.contacts a.email:hover { color: var(--accent); }
#copied { display: block; min-height: 1.2em; margin-top: 0.8rem; font-family: var(--mono); font-size: 0.75rem; color: var(--accent); }

.portrait { display: block; width: 168px; height: 168px; max-width: 100%; margin-top: 1.2rem; border-radius: 50%; clip-path: circle(48.5%); object-fit: cover; background: var(--sky); }
@media (max-width: 760px) { .portrait { width: 132px; height: 132px; } }

/* Current project */
.current { margin-top: 2rem; padding: 1.5rem; border: 1px solid var(--line); border-left: 3px solid var(--accent); background: var(--sky); }
.current .sub { margin: 0 0 0.5rem; }
.current h3 { font-size: 1.6rem; letter-spacing: -0.01em; }
.current p:not(.sub) { max-width: 40rem; margin: 0.6rem 0 1.1rem; }

/* Journal */
.count { display: block; margin-top: 0.4rem; font-variant-numeric: tabular-nums; }
.composer { display: grid; gap: 0.9rem; padding: 1.4rem; margin: 1.5rem 0 2.2rem; border: 1px solid var(--line); background: var(--sky); }
.composer .sub { margin: 0; }
.composer label { display: grid; gap: 0.35rem; font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); min-width: 0; }
.composer input, .composer select, .composer textarea {
  font: inherit; font-family: var(--body); font-size: 1rem; text-transform: none; letter-spacing: 0;
  color: var(--ink); background: var(--paper); border: 1px solid var(--line); padding: 0.6rem 0.7rem; width: 100%; border-radius: 0;
}
.composer textarea { resize: vertical; line-height: 1.55; }
.composer input:focus, .composer select:focus, .composer textarea:focus { outline: 2px solid var(--cool); outline-offset: 0; }
.composer .row { display: flex; gap: 0.9rem; flex-wrap: wrap; align-items: end; }
.composer .row label { flex: 1 1 160px; }
.status { font-family: var(--mono); font-size: 0.75rem; color: var(--accent); }
.chips { display: flex; gap: 0.5rem; flex-wrap: wrap; margin: 1.5rem 0 1.8rem; }
.chip { font-family: var(--mono); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; padding: 0.4rem 0.8rem; border: 1px solid var(--line); background: transparent; color: var(--muted); cursor: pointer; }
.chip.on { border-color: var(--ink); color: var(--ink); background: var(--sky); }
.entries { list-style: none; padding: 0; margin: 0; display: grid; gap: 2.2rem; }
.entry { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); gap: 1rem; }
.entry .d { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); line-height: 1.35; font-variant-numeric: tabular-nums; }
.entry .d strong { display: block; font-size: 1.6rem; color: var(--ink); font-weight: 500; }
.tag { display: inline-block; font-family: var(--mono); font-size: 0.68rem; text-transform: uppercase; letter-spacing: 0.08em; padding: 0.15rem 0.45rem; margin-bottom: 0.45rem; border: 1px solid currentColor; }
.tag.research { color: var(--cool); }
.tag.general { color: var(--accent); }
.entry h3 { font-size: 1.3rem; }
.entry .body { max-width: 40rem; margin-top: 0.6rem; }
.entry .body p { margin: 0 0 0.8rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.entry .body.clamp { max-height: 9.5em; overflow: hidden; -webkit-mask-image: linear-gradient(#000 60%, transparent); mask-image: linear-gradient(#000 60%, transparent); }
.linkbtn { background: none; border: 0; padding: 0; font-family: var(--mono); font-size: 0.75rem; color: var(--cool); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
.linkbtn.danger { color: var(--accent); }
.tools { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 0.4rem; align-items: center; }
.empty { font-family: var(--mono); font-size: 0.8rem; color: var(--muted); border: 1px dashed var(--line); padding: 1.2rem; margin: 0; }
.more { margin-top: 1.8rem; }

.shots { margin: 1rem 0 0.4rem; max-width: 40rem; display: grid; gap: 0.6rem; }
.shots.multi { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.shots a { display: block; border: 1px solid var(--line); background: var(--sky); }
.shots img { display: block; width: 100%; height: auto; max-height: 520px; object-fit: contain; }
.shots.multi img { aspect-ratio: 4 / 3; object-fit: cover; max-height: none; }
.shots figcaption { grid-column: 1 / -1; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }

footer { max-width: 1080px; margin: 0 auto; padding: 2rem 20px 3rem; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; border-top: 1px solid var(--line); }
footer a { color: var(--muted); }

@media (max-width: 760px) {
  section { grid-template-columns: minmax(0, 1fr); gap: 1rem; padding-block: 3rem; }
  .timeline li { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .hero-inner { padding-top: 3rem; }
}

/* Links to institutions */
a.org { color: inherit; text-decoration: underline; text-decoration-color: color-mix(in srgb, currentColor 35%, transparent); text-decoration-thickness: 1px; text-underline-offset: 3px; transition: color .15s, text-decoration-color .15s; }
a.org:hover, a.org:focus-visible { color: var(--accent); text-decoration-color: currentColor; }
h3 a.org { text-decoration-thickness: 2px; }

/* Research themes: two per row; earlier work quieter */
.themes.pair { grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); }
.themes.earlier .theme { border-top-color: var(--line); }
.themes.earlier h3 { font-size: 1.08rem; }

/* Journal sharing */
.tools .share { display: inline-flex; gap: 0.9rem; align-items: center; flex-wrap: wrap; }
.share-label { font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
a.linkbtn { display: inline-block; }
.entry { scroll-margin-top: 5rem; }
.entry.linked { background: color-mix(in srgb, var(--accent) 8%, transparent); outline: 8px solid color-mix(in srgb, var(--accent) 8%, transparent); }