:root {
  --bg: #0a0a0a;
  --bg-alt: #111110;
  --ink: #ece7db;
  --ink-dim: #a39d8f;
  --gold: #c9a227;
  --gold-soft: rgba(201, 162, 39, 0.35);
  --serif: "Playfair Display", Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  scroll-behavior: smooth;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--ink);
  margin: 0;
}

a {
  color: var(--ink);
}

.rule {
  width: 64px;
  height: 1px;
  margin: 1.5rem auto;
  background: var(--gold);
}

.rule-left {
  margin: 1.1rem 0 2.2rem;
}

/* --- navbar --- */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 2.5rem;
  background: var(--gold);
  border-bottom: 1px solid rgba(10, 10, 10, 0.25);
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  font-family: var(--serif);
  letter-spacing: 0.18em;
  font-size: 0.95rem;
  text-decoration: none;
  color: var(--bg);
}

.admin-link {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--bg);
  opacity: 0.7;
  border: 1px solid rgba(10, 10, 10, 0.35);
  border-radius: 2px;
  padding: 0.2rem 0.5rem;
  transition: opacity 0.2s ease, border-color 0.2s ease;
}

.admin-link:hover {
  opacity: 1;
  border-color: var(--bg);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--bg);
  border-radius: 1px;
}

.navlinks {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.lang-switch select {
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(10, 10, 10, 0.35);
  color: var(--bg);
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.15rem;
  cursor: pointer;
}

.lang-switch select:hover,
.lang-switch select:focus {
  border-bottom-color: var(--bg);
  outline: none;
}

@media (min-width: 901px) {
  .brand-group {
    order: 2;
  }
  .navlinks {
    order: 1;
  }
}

.navlinks a {
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--bg);
  position: relative;
  padding-bottom: 0.2rem;
}

.navlinks a:hover {
  color: var(--bg);
}

.navlinks a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--bg);
  transition: right 0.25s ease;
}

.navlinks a:hover::after {
  right: 0;
}

/* --- hero --- */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 6rem 1.5rem 3rem;
}

.hero h1 {
  font-size: clamp(3rem, 7.5vw, 5rem);
  letter-spacing: 0.06em;
}

.diploma {
  font-family: var(--serif);
  color: var(--ink);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  margin: 0 0 0.5rem;
}

.nationality {
  margin: 0 0 1.3rem;
}

.tagline {
  color: var(--ink-dim);
  font-size: 1.2rem;
  max-width: 30em;
  line-height: 1.7;
}

/* --- sitemap tree (always vertical: works for any number of nodes) --- */

.sitemap {
  padding: 0 1.5rem 6rem;
}

.tree,
.tree ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: block;
}

.tree {
  text-align: left;
  max-width: 320px;
  margin: 0 auto;
}

.tree li {
  display: block;
  position: relative;
  padding: 0.4rem 0 0.4rem 1.1rem;
}

.tree > li {
  padding-left: 0;
}

.tree li ul {
  margin-left: 0.6rem;
  padding-left: 1.1rem;
  border-left: 1px solid var(--gold-soft);
}

/* horizontal tick connecting a child node to its parent's vertical line */
.tree li ul li::before {
  content: "";
  display: block;
  position: absolute;
  top: 1.05rem;
  left: -1.1rem;
  width: 1.1rem;
  border-top: 1px solid var(--gold-soft);
}

.tree a,
.tree summary {
  display: block;
  font-family: var(--serif);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  color: var(--ink);
  text-decoration: none;
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--gold-soft);
  border-radius: 2px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.tree a:hover,
.tree summary:hover {
  border-color: var(--gold);
  color: var(--gold);
}

/* collapsible "Projets" branch */

.tree summary {
  cursor: pointer;
  list-style: none;
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  padding-right: 2.2rem;
}

.hint-tag {
  color: var(--ink-dim);
  font-size: 0.8em;
}

.tree summary::-webkit-details-marker {
  display: none;
}

.tree summary::after {
  content: "›";
  position: absolute;
  right: 0.9rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--ink-dim);
  transition: transform 0.2s ease;
}

.tree details[open] > summary::after {
  transform: translateY(-50%) rotate(90deg);
}

/* scrollable "carousel": shows 4 projects, scroll for the rest */

.tree-scroll {
  max-height: 11.75rem;
  overflow-y: auto;
  scroll-snap-type: y proximity;
  padding-right: 0.3rem;
}

.tree-scroll li {
  scroll-snap-align: start;
}

.tree-scroll::-webkit-scrollbar {
  width: 5px;
}

.tree-scroll::-webkit-scrollbar-track {
  background: transparent;
}

.tree-scroll::-webkit-scrollbar-thumb {
  background: var(--gold-soft);
  border-radius: 3px;
}

.scroll-hint {
  text-align: center;
  margin: 0.8rem 0 0.5rem;
}

/* --- scroll reveal --- */

.reveal.reveal-ready {
  opacity: 0;
  transform: translateX(70px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.reveal-ready.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* --- content sections --- */

.projets,
.clients,
.collaborateurs,
.contact {
  max-width: 720px;
  margin: 0 auto;
  padding: 5rem 1.5rem;
  text-align: center;
}

.projets h2,
.clients h2,
.collaborateurs h2,
.contact h2 {
  font-size: 1.6rem;
  letter-spacing: 0.04em;
}

.clients p {
  color: var(--ink-dim);
  line-height: 1.7;
}

.collab-card {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  border: 2px solid rgba(201, 162, 39, 0.45);
  padding: 1.5rem 2rem;
  text-align: left;
}

.collab-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--gold-soft);
  flex-shrink: 0;
}

.collab-info h3 {
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
}

.project-card {
  border: 2px solid rgba(201, 162, 39, 0.45);
  padding: 2rem;
  text-align: left;
}

.project-card + .project-card {
  margin-top: 1.5rem;
}

.project-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.8rem;
}

.project-card h3 {
  font-size: 1.15rem;
  margin-bottom: 0;
}

.project-date {
  color: var(--ink-dim);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.project-card p {
  color: var(--ink-dim);
  line-height: 1.7;
  margin: 0 0 1.4rem;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.project-links a {
  color: var(--gold);
  text-decoration: none;
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
}

.project-links a:hover {
  border-bottom-color: var(--gold);
}

.private-tag,
.public-tag {
  color: var(--ink-dim);
  font-size: 0.8em;
}

.contact p a {
  color: var(--gold);
  text-decoration: none;
  font-size: 1.05rem;
  border-bottom: 1px solid var(--gold-soft);
}

.contact p a:hover {
  border-bottom-color: var(--gold);
}

/* --- footer --- */

.site-footer {
  text-align: center;
  padding: 0 1.5rem 3rem;
}

.site-footer p {
  color: var(--ink-dim);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.site-footer .legal-links {
  margin-top: 0.6rem;
  display: flex;
  justify-content: center;
  gap: 1.2rem;
}

.site-footer .legal-links a {
  color: var(--ink-dim);
  font-size: 0.75rem;
  text-decoration: none;
}

.site-footer .legal-links a:hover {
  color: var(--gold);
}

@media (max-width: 900px) {
  .navbar {
    padding: 0.9rem 1.2rem;
    flex-wrap: wrap;
  }

  .nav-toggle {
    display: flex;
  }

  .navlinks {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    background: var(--gold);
    border-bottom: 1px solid rgba(10, 10, 10, 0.25);
    padding: 1.2rem;
  }

  .navlinks.open {
    display: flex;
  }

  .tree a,
  .tree summary {
    font-size: 0.8rem;
    padding: 0.45rem 0.85rem;
  }

  .tree summary {
    padding-right: 2rem;
  }
}