/* ============================================================
   N'Goran Sylvain N'DRI — site personnel (version multi-pages)
   Design : transition énergétique — une courbe qui décline
   (fossile) croise une courbe qui monte (renouvelables).
   Encre profonde + papier froid + accent voltage.
   ============================================================ */

:root{
  --ink:        #12211d;
  --ink-soft:   #3c4d47;
  --paper:      #eef0e7;
  --paper-2:    #e4e7db;
  --line:       #c9cdba;
  --teal:       #546D79;
  --teal-2:     #204540;
  --paper-on-teal: #dfe6de;
  --amber:       #111827;
  --amber-dim:  #b9822c;
  --fossil:     #8a7a63;
  --renew:      #3f8f68;

  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", serif;
  --font-body: "IBM Plex Sans", -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, monospace;

  --measure: 62ch;
}

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

html{ scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  margin: 0;
}

p{ margin: 0 0 1em; max-width: var(--measure); }

.container{
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}

section{ padding: 96px 0; }

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--amber-dim);
  margin-bottom: 10px;
  display: block;
}

.section-head{
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.section-head h2{ font-size: clamp(1.7rem, 3vw, 2.3rem); }

.section-head p{
  margin: 0;
  color: var(--ink-soft);
  max-width: 40ch;
}

/* -------------------- Skip link -------------------- */
.skip-link{
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--amber);
  color: var(--teal);
  padding: 10px 16px;
  z-index: 200;
  font-weight: 600;
}
.skip-link:focus{ left: 12px; top: 12px; }

/* -------------------- Nav -------------------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--teal);
  color: var(--paper-on-teal);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.nav{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  max-width: 1120px;
  margin: 0 auto;
}

.wordmark{
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.01em;
  display: flex;
  align-items: center;
  gap: 12px;
}

.wordmark-logo{
  height: 22px;
  width: auto;
  display: block;
}

.wordmark small{
  display: block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 400;
  color: var(--amber);
  letter-spacing: 0.08em;
}

.nav-links{
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links li:not(:last-child){ margin-right: 4px; }

.nav-links a{
  text-decoration: none;
  font-size: 0.95rem;
  color: var(--paper-on-teal);
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.nav-links a:hover,
.nav-links a:focus-visible{
  color: var(--amber);
  border-color: var(--amber);
}

.nav-links a[aria-current="page"]{
  color: var(--amber);
  border-color: var(--amber);
}

.lang-link{
  display: inline-block;
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 999px;
  padding: 5px 13px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-decoration: none !important;
}
.lang-link:hover{ border-color: var(--amber); color: var(--amber) !important; }

.nav-toggle{
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.3);
  color: #fff;
  border-radius: 6px;
  padding: 6px 10px;
  font-size: 1rem;
  cursor: pointer;
}

/* -------------------- Bannières photo (hero + pages internes + contact) --------
   Chaque section peut recevoir sa propre photo de fond via un style="" inline
   (background-image). Un dégradé sombre (::before) garde le texte lisible
   par-dessus n'importe quelle image ; tant qu'aucune photo n'est fournie,
   c'est simplement le fond --teal qui s'affiche. */
.banner-photo{
  background-color: var(--teal);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  position: relative;
}

.banner-photo::before{
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(15,26,22,0.88) 0%, rgba(15,26,22,0.6) 45%, rgba(15,26,22,0.3) 100%),
    linear-gradient(180deg, rgba(23,51,46,0.35) 0%, rgba(15,26,22,0.75) 100%);
  pointer-events: none;
}

.banner-photo > .container,
.banner-photo > *{
  position: relative;
  z-index: 1;
}

/* -------------------- Hero (page d'accueil) -------------------- */
.hero{
  color: var(--paper-on-teal);
  padding: 150px 0 96px;
  min-height: 56vh;
  display: flex;
  align-items: flex-end;
}

.hero .container{ max-width: 1120px; }

.hero-text{ max-width: 640px; }

.hero-eyebrow{
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--amber);
  letter-spacing: 0.03em;
  margin-bottom: 18px;
  display: block;
}

.hero h1{
  color: #fff;
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  margin-bottom: 22px;
}

.hero h1 em{ font-style: italic; color: var(--amber); }

.hero-lede{
  color: var(--paper-on-teal);
  font-size: 1.08rem;
  max-width: 46ch;
  margin-bottom: 34px;
}

.hero-actions{ display: flex; gap: 14px; flex-wrap: wrap; }

.btn{
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  padding: 12px 22px;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.15s ease, color 0.15s ease, border-color .15s ease;
}
.btn:hover{ transform: translateY(-1px); }

.btn-primary{ background: var(--amber); color: var(--teal); }
.btn-primary:hover{ background: #eeb355; }

.btn-ghost{ background: transparent; color: #fff; border-color: rgba(255,255,255,0.4); }
.btn-ghost:hover{ border-color: #fff; }

.btn-outline{ background: transparent; color: var(--teal); border-color: var(--teal); }
.btn-outline:hover{ background: var(--teal); color: #fff; }

.home-intro{ padding: 88px 0; }
.home-intro .container{
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
}
.home-intro p{ color: var(--ink-soft); font-size: 1.05rem; }

/* -------------------- Page banner (pages internes) -------------------- */
.page-banner{
  color: var(--paper-on-teal);
  padding: 90px 0 72px;
}
.page-banner .eyebrow{ color: var(--amber); }
.page-banner h1{
  color: #fff;
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
}
.page-banner p{ color: var(--paper-on-teal); margin-top: 14px; max-width: 52ch; }

/* -------------------- About -------------------- */
.about-grid{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 56px;
}

.about-portrait img{ border-radius: 3px; border: 1px solid var(--line); }

.about-credentials{
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 0.88rem;
  color: var(--ink-soft);
}
.about-credentials dt{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--amber-dim);
  margin-top: 12px;
}
.about-credentials dt:first-child{ margin-top: 0; }
.about-credentials dd{ margin: 2px 0 0; }

.about-body p{ color: var(--ink-soft); }
.about-body strong{ color: var(--ink); }

.pull-goal{
  font-family: var(--font-display);
  font-size: 1.3rem;
  line-height: 1.4;
  color: var(--teal);
  border-left: 3px solid var(--amber);
  padding-left: 20px;
  margin: 28px 0 0;
  max-width: 52ch;
}

/* -------------------- Research -------------------- */
.paper-list{ list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }

.paper-item{
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.paper-year{ font-family: var(--font-mono); color: var(--amber-dim); font-size: 0.95rem; padding-top: 3px; }
.paper-title{ font-family: var(--font-display); font-size: 1.18rem; color: var(--ink); margin-bottom: 4px; }
.paper-coauthors{ font-size: 0.9rem; color: var(--ink-soft); margin: 0; }

/* -------------------- Projects -------------------- */
.project-grid{
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 2px;
  background: var(--line);
  border: 1px solid var(--line);
}

.project-card{
  background: var(--paper);
  padding: 28px 26px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.project-tag{ font-family: var(--font-mono); font-size: 0.68rem; color: var(--amber-dim); letter-spacing: 0.02em; }
.project-card h3{ font-size: 1.08rem; font-family: var(--font-display); }
.project-card p{ font-size: 0.9rem; color: var(--ink-soft); margin: 0; flex-grow: 1; }
.project-card a{
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid var(--amber);
  align-self: flex-start;
}
.project-card a:hover{ color: var(--amber-dim); }

/* -------------------- CV -------------------- */
.cv-box{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  background: var(--paper-2);
  border: 1px solid var(--line);
  padding: 36px 40px;
}
.cv-box p{ margin: 0; color: var(--ink-soft); max-width: 46ch; }
.cv-actions{ display: flex; gap: 12px; flex-wrap: wrap; }

.cv-notice{
  margin-top: 28px;
  font-size: 0.88rem;
  color: var(--ink-soft);
  border-left: 3px solid var(--line);
  padding-left: 16px;
}

/* -------------------- Contact -------------------- */
.contact-section{ background: var(--teal); color: var(--paper-on-teal); }
.contact-section h1, .contact-section h2{ color: #fff; }

.contact-grid{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 48px;
  align-items: start;
}

.contact-lede{ max-width: 46ch; color: var(--paper-on-teal); }

.social-list{ list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.social-list a{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 0;
  border-bottom: 1px solid rgba(255,255,255,0.15);
  text-decoration: none;
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.05rem;
}
.social-list a span.hint{ font-family: var(--font-mono); font-size: 0.7rem; color: var(--amber); }
.social-list a:hover{ color: var(--amber); }

/* -------------------- Footer -------------------- */
.site-footer{
  background: var(--teal);
  color: var(--paper-on-teal);
  padding: 26px 0 34px;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.site-footer .container{ display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer a{ color: var(--amber); text-decoration: none; }




.site-footer {
  background-color: #333333;
  color: #FFFFFF;
  text-align: center;
  padding: 2rem 0;
}

.site-footer .container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.footer-info {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.footer-links a {
  display: inline-block;
  padding: 0.45rem 0.9rem;
  border: 1px solid #546D79;
  border-radius: 4px;
  color: #546D79;
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  transition: all 0.2s ease;
}

.footer-links a:hover {
  background-color: #546D79;
  color: #fff;
}

/*--------------------------------- social list ---------------------------*/
.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
}

.footer-links a {
  display: flex;
  align-items: center;
  justify-content: center;

  min-width: 110px;
  height: 34px;
  box-sizing: border-box;

  /* Contour bleu */
  border: 1px solid #546D79;

  /* Fond blanc */
  background-color: #FFFFFF;

  /* Texte bleu */
  color: #546D79;

  border-radius: 4px;
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 500;

  transition: all 0.2s ease;
}

.footer-links a:hover {
  background-color: #546D79;
  color: #FFFFFF;
}


.social-list .hint {
  display: none;
}


/* -------------------- Responsive -------------------- */
@media (max-width: 860px){
  .hero{ padding: 120px 0 72px; min-height: 46vh; }
  .about-grid{ grid-template-columns: 1fr; }
  .about-portrait img{ max-width: 200px; }
  .contact-grid{ grid-template-columns: 1fr; }
  .home-intro .container{ grid-template-columns: 1fr; align-items: start; }
  section{ padding: 64px 0; }
}

@media (max-width: 680px){
  .nav-links{
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--teal);
    flex-direction: column;
    align-items: flex-start;
    padding: 18px 32px 26px;
    gap: 16px;
    display: none;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .nav-links.open{ display: flex; }
  .nav-toggle{ display: inline-block; }
  .cv-box{ flex-direction: column; align-items: flex-start; }
}

a:focus-visible, button:focus-visible{ outline: 2px solid var(--amber); outline-offset: 2px; }