/* Joelle Mbatchou — personal academic site
   Soft ink-on-cream palette, distinctive type, generous rhythm */

:root {
  --bg: #f6f1ea;
  --bg-elevated: #fffdf9;
  --ink: #1c2430;
  --ink-soft: #4a5563;
  --muted: #6b7280;
  --line: #e4dcd0;
  --accent: #1f6f66;
  --accent-deep: #15564f;
  --accent-soft: #d7ebe7;
  --warm: #b85c38;
  --warm-soft: #f3e0d6;
  --shadow: 0 18px 50px -28px rgba(28, 36, 48, 0.35);
  --radius: 18px;
  --max: 72rem;
  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --font-body: "Source Sans 3", "Source Sans Pro", "Segoe UI", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, #e8f3f0 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #f6e8df 0%, transparent 50%),
    var(--bg);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-weight: 400;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent-deep); text-underline-offset: 0.18em; }
a:hover { color: var(--warm); }
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  border-radius: 999px;
  z-index: 100;
}
.skip-link:focus { top: 1rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--line) 80%, transparent);
}

.nav-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.02em;
}
.brand img {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}
.brand span { font-size: 1.05rem; }
.brand small {
  display: block;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: var(--bg-elevated);
  border-radius: 10px;
  padding: 0.45rem 0.7rem;
  font: inherit;
  cursor: pointer;
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-links {
  display: flex;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  display: inline-block;
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.45rem 0.7rem;
  border-radius: 999px;
}
.nav-links a:hover { color: var(--ink); background: color-mix(in srgb, var(--accent-soft) 55%, transparent); }
.nav-links a[aria-current="page"] {
  color: var(--accent-deep);
  background: var(--accent-soft);
}

.social {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}
.social a {
  width: 2.15rem;
  height: 2.15rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid transparent;
}
.social a:hover {
  color: var(--accent-deep);
  background: var(--bg-elevated);
  border-color: var(--line);
}
.social svg { width: 1.05rem; height: 1.05rem; fill: currentColor; }

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 2.5rem;
  align-items: center;
  margin-bottom: 2.5rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.9rem;
}
.eyebrow::before {
  content: "";
  width: 1.4rem;
  height: 2px;
  background: var(--accent);
  border-radius: 999px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.15;
  margin: 0 0 0.75rem;
}
h1 { font-size: clamp(2.3rem, 4.5vw, 3.4rem); }
h2 { font-size: clamp(1.55rem, 2.6vw, 2rem); }
h3 { font-size: 1.2rem; }

.lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 42rem;
  margin: 0 0 1.5rem;
}

.hero-card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 6px);
  box-shadow: var(--shadow);
  padding: 0.85rem;
  position: relative;
}
.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -0.6rem -0.6rem auto;
  width: 42%;
  height: 42%;
  background: var(--warm-soft);
  border-radius: var(--radius);
  z-index: -1;
}
.hero-photo {
  border-radius: var(--radius);
  aspect-ratio: 4 / 5;
  object-fit: cover;
  width: 100%;
  background: #ddd;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.72rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: var(--accent-deep); color: #fff; }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--bg-elevated); color: var(--ink); }

.section {
  margin: 2.75rem 0;
}
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}
.section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
}
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem 1.35rem;
  box-shadow: 0 1px 0 rgba(255,255,255,0.7) inset;
}
.card .tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--warm);
  background: var(--warm-soft);
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.7rem;
}
.card p { margin: 0; color: var(--ink-soft); font-size: 0.98rem; }

.research-list {
  display: grid;
  gap: 1.1rem;
}
.research-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.4rem;
}
.research-item .mark {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  background: var(--accent);
  font-family: var(--font-display);
}
.research-item:nth-child(2) .mark { background: var(--warm); }
.research-item:nth-child(3) .mark { background: #2f6ea8; }
.research-item h3 { margin-bottom: 0.4rem; }
.research-item p { margin: 0; color: var(--ink-soft); }
.research-item .more { margin-top: 0.75rem; display: inline-block; font-weight: 700; }

.pub-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}
.pub {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.15rem;
  display: grid;
  grid-template-columns: 3.2rem 1fr;
  gap: 0.85rem;
}
.pub .num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--muted);
  padding-top: 0.2rem;
}
.pub .title {
  font-weight: 650;
  color: var(--ink);
  margin: 0 0 0.25rem;
  font-size: 1.02rem;
  line-height: 1.35;
}
.pub .meta {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
}
.pub .venue {
  color: var(--accent-deep);
  font-style: italic;
}
.pub.first-author .title::after {
  content: "First author";
  display: inline-block;
  margin-left: 0.55rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--warm);
  background: var(--warm-soft);
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  vertical-align: middle;
  font-style: normal;
}

.cv-layout {
  display: grid;
  grid-template-columns: 1fr 16rem;
  gap: 1.5rem;
  align-items: start;
}
.cv-side {
  position: sticky;
  top: 5.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.2rem;
}
.cv-side h3 { font-size: 1rem; margin-bottom: 0.6rem; }
.cv-side ul { margin: 0 0 1rem; padding-left: 1.1rem; color: var(--ink-soft); }
.cv-side li { margin: 0.25rem 0; }
.skills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}
.skills span {
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-weight: 650;
  font-size: 0.8rem;
  padding: 0.28rem 0.55rem;
  border-radius: 999px;
}

.timeline {
  display: grid;
  gap: 1rem;
}
.job, .edu, .award, .talk {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
}
.job .when, .edu .when, .award .when, .talk .when {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
}
.job ul { margin: 0.55rem 0 0; padding-left: 1.15rem; color: var(--ink-soft); }
.job li { margin: 0.3rem 0; }

.contact-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.25rem;
}
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}
.contact-list li {
  background: var(--bg-elevated);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  display: grid;
  grid-template-columns: 2.4rem 1fr;
  gap: 0.75rem;
  align-items: center;
}
.contact-list .icon {
  width: 2.4rem;
  height: 2.4rem;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  display: grid;
  place-items: center;
}
.contact-list a { text-decoration: none; font-weight: 700; color: var(--ink); }
.contact-list a:hover { color: var(--accent-deep); }
.contact-list .label {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 0.15rem;
}

.note {
  background: linear-gradient(135deg, var(--accent-soft), #eef6f4);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, var(--line));
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
}
.note p { margin: 0; color: var(--ink-soft); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 1.25rem 2.5rem;
  color: var(--muted);
  font-size: 0.92rem;
}
.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: center;
}
.footer-inner a { color: var(--ink-soft); }

@media (max-width: 900px) {
  .hero, .cv-layout, .contact-grid, .card-grid { grid-template-columns: 1fr; }
  .cv-side { position: static; }
  .hero { gap: 1.5rem; }
  .hero-card { max-width: 22rem; }
}

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; }
  .nav-panel {
    display: none;
    position: absolute;
    left: 1rem;
    right: 1rem;
    top: calc(100% + 0.35rem);
    background: var(--bg-elevated);
    border: 1px solid var(--line);
    border-radius: 16px;
    padding: 0.85rem;
    flex-direction: column;
    align-items: stretch;
    box-shadow: var(--shadow);
  }
  .nav-panel.open { display: flex; }
  .nav-links { flex-direction: column; }
  .social { justify-content: flex-start; padding-top: 0.35rem; }
  .pub { grid-template-columns: 2.4rem 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn:hover { transform: none; }
}