:root {
  --background-color: #ffffff;
  --text-color: #1f2933;        /* gris anthracite */
  --main-color: #1e3a5f;        /* bleu marine */
  --accent-color: #355f8a;     /* bleu liens */
}

/* HEADER + ABOUT ME à gauche de la photo */
.header-container {
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  padding: 40px; 0; /* plus de padding du tout */
}


.header-left {
  flex: 1;
  min-width: 280px;
}

.header-right {
  flex-shrink: 0;
}

.portrait {
  width: 400px;
  height: 400px;
  object-fit: cover;
  border-radius: 0;
  flex-shrink: 0;
}

/* ABOUT ME */
.about-me {
  margin-top: 20px;
}

/* TITRES */
h1 {
  font-family: 'Libre Baskerville', serif;
  font-size: 2.5em;
  margin: 0;
  color: var(--main-color);
}

.subtitle {
  margin-top: 8px;
  color: var(--accent-color);
  font-size: 1.2em;
}

h2 {
  font-family: 'Libre Baskerville', serif;
  color: var(--main-color);
  margin-top: 40px;
  border-bottom: 2px solid var(--accent-color);
  padding-bottom: 6px;
}

h3 {
  font-size: 1.2em;
  margin-top: 25px;
  color: var(--main-color);
}

/* TEXTE */
body {
  margin: 0;
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: 'Open Sans', 'Source Sans 3', sans-serif;
  line-height: 1.4;
}

ul, ol {
  padding-left: 25px;
}

li {
  margin-bottom: 10px;
}

a {
  color: var(--accent-color);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* FOOTER */
footer {
  margin-top: 60px;
  text-align: center;
  font-size: 0.9em;
  color: #bbbbbb;
}

/* RESPONSIVE */
@media (max-width: 700px) {
  .header-container {
    flex-direction: column;
    align-items: center;
  }

  .header-right {
    margin-top: 20px;
  }

  .about-me {
    margin-top: 20px;
  }

  .portrait {
    width: 200px;
    height: 200px;
  }
}

header,
section,
footer {
  max-width: 1100px;
  margin-left: auto;
  margin-right: auto;
}

.profile-buttons {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

.profile-buttons .btn-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;

  padding: 6px 12px;
  background-color: #f0f0f0;
  border-radius: 6px;

  text-decoration: none;
  color: black;
  font-size: 14px;
  line-height: 1;

  transition: background-color 0.2s;
}

.profile-buttons .btn-link:hover {
  background-color: #ddd;
}

.profile-buttons .btn-link img {
  width: 18px;
  height: 18px;
  object-fit: contain;
}

.profile-buttons .arxiv-logo {
  width: 28px;
  height: 18px;
}