/* ============================================================
   Nicolas Sénécaut — Custom Theme
   Fonts: Fraunces (display) + DM Sans (body)
   Palette: warm off-white bg, deep slate text, muted teal accent
   ============================================================ */

/* ── Reset & base ──────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #F7F5F0;       /* warm off-white */
  --bg-card:     #FFFFFF;
  --bg-subtle:   #EFECE6;
  --text:        #1E1C19;       /* deep warm black */
  --text-2:      #5A574F;       /* muted */
  --text-3:      #8A877F;       /* hint */
  --accent:      #328df5;       /* muted teal */
  --accent-lt:   #e5ebf0;
  --accent-dark: #1a1b44;
  --border:      rgba(30,28,25,.1);
  --border-md:   rgba(30,28,25,.18);

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;

  --max-w:   780px;
  --nav-h:   64px;
  --radius:  10px;
  --radius-lg: 16px;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s;
}
a:hover { color: var(--accent-dark); }

/* ── Typography ────────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.2;
  color: var(--text);
  letter-spacing: -.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); margin-bottom: 1rem; }
h3 { font-size: 1.2rem; font-weight: 600; font-family: var(--font-body); margin-bottom: .5rem; }

p { margin-bottom: 1.1em; color: var(--text-2); }
strong { color: var(--text); font-weight: 500; }

/* ── Layout helpers ────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Navigation ────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  height: var(--nav-h);
  backdrop-filter: blur(8px);
}

.nav-inner {
  max-width: calc(var(--max-w) + 4rem);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.nav-logo {
  display: flex;
  flex-direction: column;
  gap: .05em;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-name {
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 400;
  color: var(--text);
  letter-spacing: -.01em;
  line-height: 1.1;
}
.nav-logo-sub {
  font-size: .7rem;
  color: var(--text-3);
  letter-spacing: .05em;
  text-transform: uppercase;
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: .25rem;
  list-style: none;
}

.nav-links a {
  font-size: .85rem;
  font-weight: 400;
  color: var(--text-2);
  padding: .4rem .7rem;
  border-radius: 6px;
  transition: background .15s, color .15s;
}
.nav-links a:hover,
.nav-links a.active {
  background: var(--bg-subtle);
  color: var(--text);
}

.nav-cta {
  background: var(--text) !important;
  color: var(--bg) !important;
  border-radius: 6px;
  padding: .4rem .9rem !important;
}
.nav-cta:hover {
  background: var(--accent-dark) !important;
  color: var(--bg) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: .4rem;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: transform .2s, opacity .2s;
}

/* ── Main content ──────────────────────────────────────────── */
.site-main {
  min-height: calc(100vh - var(--nav-h) - 160px);
  padding-bottom: 5rem;
}

/* ── Homepage hero ─────────────────────────────────────────── */
.hero {
  padding: 5rem 1.5rem 4rem;
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: start;
}

.hero-content {}

.hero-kicker {
  font-size: .8rem;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.hero h1 {
  margin-bottom: 1.25rem;
  color: var(--text);
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--text-2);
  margin-bottom: 2rem;
  max-width: 52ch;
}

.hero-actions {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: .4em;
  font-family: var(--font-body);
  font-size: .85rem;
  font-weight: 500;
  padding: .55rem 1.2rem;
  border-radius: 7px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all .15s;
  text-decoration: none;
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.btn-primary:hover {
  background: var(--accent-dark);
  border-color: var(--accent-dark);
  color: var(--bg);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border-color: var(--border-md);
}
.btn-outline:hover {
  background: var(--bg-subtle);
  color: var(--text);
}

/* ── Profile links (social row) ────────────────────────────── */
.profile-links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}
.profile-links a {
  font-size: .82rem;
  color: var(--text-3);
  display: flex;
  align-items: center;
  gap: .3em;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
  transition: color .15s, border-color .15s;
}
.profile-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.profile-links a::before {
  content: '↗';
  font-size: .7rem;
}

/* ── Portrait / avatar ─────────────────────────────────────── */
.hero-portrait {
  width: 140px;
  flex-shrink: 0;
}
.hero-portrait-placeholder {
  width: 140px;
  height: 170px;
  background: var(--bg-subtle);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--text-3);
  border: 1px solid var(--border);
  letter-spacing: -.02em;
}
.hero-portrait img {
  width: 140px;
  height: 170px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
}

/* ── Section divider ───────────────────────────────────────── */
.section-divider {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  border-top: 1px solid var(--border);
}

/* ── About / bio section ───────────────────────────────────── */
.bio-section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.bio-section h2 {
  font-size: 1rem;
  font-weight: 500;
  font-family: var(--font-body);
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 1rem;
}

.bio-text p:last-child { margin-bottom: 0; }

/* ── Highlights / chips ────────────────────────────────────── */
.highlights {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.2rem;
}
.chip {
  font-size: .78rem;
  padding: .3rem .75rem;
  border-radius: 20px;
  background: var(--bg-subtle);
  color: var(--text-2);
  border: 1px solid var(--border);
  font-weight: 400;
}
.chip-accent {
  background: var(--accent-lt);
  color: var(--accent-dark);
  border-color: rgba(45,107,90,.18);
}

/* ── Positions / timeline ──────────────────────────────────── */
.timeline {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.timeline-item {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: .75rem;
  align-items: start;
}
.timeline-year {
  font-size: .75rem;
  font-weight: 500;
  color: var(--text-3);
  padding-top: .2rem;
  letter-spacing: .03em;
}
.timeline-body {}
.timeline-role {
  font-size: .9rem;
  font-weight: 500;
  color: var(--text);
  line-height: 1.3;
}
.timeline-place {
  font-size: .8rem;
  color: var(--text-3);
  margin-top: .1rem;
}

/* ── Generic page content ──────────────────────────────────── */
.page-content {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
}

.page-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}
.page-content h2:first-child { margin-top: 0; }

.page-content h3 {
  margin-top: 1.75rem;
  color: var(--text);
}

.page-content ul {
  padding-left: 1.2rem;
  margin-bottom: 1.1em;
  color: var(--text-2);
}
.page-content ul li { margin-bottom: .35em; }

.page-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

/* ── Publication cards ─────────────────────────────────────── */
.pub-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.pub-item {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: box-shadow .15s, border-color .15s;
}
.pub-item:hover {
  border-color: var(--border-md);
  box-shadow: 0 2px 12px rgba(30,28,25,.06);
}
.pub-authors {
  font-size: .8rem;
  color: var(--text-3);
  margin-bottom: .35rem;
}
.pub-title {
  font-size: .95rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: .3rem;
  line-height: 1.4;
}
.pub-journal {
  font-size: .82rem;
  color: var(--accent);
  font-style: italic;
  margin-bottom: .4rem;
}
.pub-abstract {
  font-size: .82rem;
  color: var(--text-3);
  line-height: 1.55;
  margin-bottom: .6rem;
}
.pub-doi {
  font-size: .78rem;
  color: var(--accent);
  font-family: var(--font-body);
}

/* ── Research cards ────────────────────────────────────────── */
.research-card {
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 1.25rem;
}
.research-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: -.01em;
  margin-bottom: .75rem;
}

.research-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: .75rem;
  margin-top: .75rem;
}
.research-grid-col {}
.research-grid-col .col-label {
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-3);
  margin-bottom: .4rem;
}
.research-grid-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.research-grid-col ul li {
  font-size: .82rem;
  color: var(--text-2);
  padding: .2rem 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.4;
}
.research-grid-col ul li:last-child { border-bottom: none; }

/* ── CV section ────────────────────────────────────────────── */
.cv-section {
  margin-bottom: 2.5rem;
}
.cv-section h2 {
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-3);
  font-family: var(--font-body);
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}

/* ── Contact page ──────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.contact-card {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.contact-card-label {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-3);
  margin-bottom: .4rem;
}
.contact-card-value {
  font-size: .92rem;
  color: var(--text);
}
.contact-card-value a { color: var(--accent); }

/* ── Footer ────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 2rem;
}
.footer-inner {
  max-width: calc(var(--max-w) + 4rem);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.footer-name {
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 400;
  color: var(--text);
  margin-bottom: .2rem;
}
.footer-affil {
  font-size: .78rem;
  color: var(--text-3);
  margin-bottom: 0;
}
.footer-links {
  display: flex;
  gap: 1.2rem;
}
.footer-links a {
  font-size: .82rem;
  color: var(--text-3);
  transition: color .15s;
}
.footer-links a:hover { color: var(--accent); }
.footer-copy {
  font-size: .75rem;
  color: var(--text-3);
  margin-bottom: 0;
}

/* ── Prose content (Markdown-generated pages) ──────────────── */
.prose h1, .prose h2, .prose h3 { font-family: var(--font-display); }
.prose p, .prose li { color: var(--text-2); }
.prose a { color: var(--accent); border-bottom: 1px solid rgba(45,107,90,.3); }
.prose a:hover { border-color: var(--accent); }
.prose blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1.2rem;
  color: var(--text-2);
  font-style: italic;
  margin: 1.5rem 0;
}
.prose code {
  font-size: .85em;
  background: var(--bg-subtle);
  padding: .15em .4em;
  border-radius: 4px;
  color: var(--text);
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 3rem 1.5rem 2.5rem;
    gap: 2rem;
  }
  .hero-portrait { position: relative; width: 100%; max-width: 600px; margin: 0 auto; }
  .hero-portrait-img { display: block; width: 100%; height: auto; border-radius: 8px; }
  .hero-portrait-placeholder { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; font-weight:700; background:#f0f0f0; color:#333; border-radius:8px; }

  /* hide placeholder when image loads */
  .hero-portrait-img + .hero-portrait-placeholder { display: none; }
  .hero-portrait-img[src=""], .hero-portrait-img[aria-hidden="true"] { display: none; }
  .hero-portrait-img:not([src]) + .hero-portrait-placeholder,
  .hero-portrait-img[src=""] + .hero-portrait-placeholder { display: flex; }

  .bio-section {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 2.5rem 1.5rem;
  }

  .research-grid { grid-template-columns: 1fr; }

  .contact-grid { grid-template-columns: 1fr; }

  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
    gap: .25rem;
    align-items: flex-start;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}

@media (max-width: 480px) {
  h1 { font-size: 1.8rem; }
  .hero-actions { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
}