:root{
  /* Dark (default) — darker grey minimal (tuned) */
  --bg: #0b0c0e;
  --bg-elev: #111317;
  --text: #e8e9ea;
  --muted: #9aa0a7;
  --accent: #3b82f6;
  --card: #0f1115;
  --border: #1e2329;
  --shadow: 0 10px 30px rgba(0,0,0,.30);
}

/* Light theme via data attribute */
[data-theme="light"]{
  --bg: #ffffff;
  --bg-elev: #f6f7f9;
  --text: #0f172a;
  --muted: #475569;
  --accent: #2563eb;
  --card: #ffffff;
  --border: #e5e7eb;
}

/* (Optionnel) Fallback système si aucun choix n’est mémorisé, géré côté JS */

*{ box-sizing:border-box }
html,body{ padding:0; margin:0 }
html{ scroll-behavior:smooth }
body{
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container{
  width: min(1100px, 92%);
  margin: 0 auto;
}

.section{
  padding: 72px 0;
}

.section-title{
  font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2rem);
  margin: 0 0 20px;
}

.lead{
  font-size: clamp(1rem, .95rem + .4vw, 1.15rem);
  color: var(--muted);
  max-width: 70ch;
}

.muted{ color: var(--muted) }

.btn{
  display:inline-flex; align-items:center; justify-content:center;
  gap:.5rem;
  padding:.65rem 1rem;
  border-radius: 0;
  background: var(--accent);
  color: #111;
  font-weight: 600;
  text-decoration: none;
  transition: transform .2s ease, box-shadow .2s ease, opacity .2s ease;
  box-shadow: var(--shadow);
  border: 1px solid transparent;
}
.btn:hover{ transform: translateY(-2px) }
.btn:active{ transform: translateY(0) }

.btn.ghost{
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
  box-shadow: none;
  border-radius: 0;
}
.btn-small{ padding:.45rem .7rem; font-size:.9rem }

.link{
  color: var(--text);
  opacity:.9;
  text-decoration:none;
  border-bottom:1px dashed var(--border);
  padding-bottom:2px;
}
.link:hover{ opacity:1; border-color: var(--accent) }

.badge{
  background: var(--bg-elev);
  border:1px solid var(--border);
  color: var(--muted);
  padding:.25rem .55rem;
  border-radius:0;
  font-size:.8rem;
}

/* Header */
.site-header{
  position: sticky; top:0; z-index:1000;
  background: color-mix(in oklab, var(--bg) 85%, black 0%);
  border-bottom:1px solid var(--border);
  backdrop-filter: saturate(1.1) blur(8px);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding: .8rem 0;
}
.brand{
  font-weight: 700; 
  letter-spacing: 0.5px; 
  color: var(--text); 
  text-decoration: none;
  transition: all 0.3s ease;
}

.brand:hover {
  opacity: 0.8;
}

.brand-name {
  font-size: 1.1rem;
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.5px;
}
.site-nav{
  display:flex; align-items:center; gap:1rem;
}
.site-nav a{
  color:var(--muted); text-decoration:none; padding:.4rem .5rem; border-radius:0;
}
.site-nav a:hover{ color:var(--text); background: var(--bg-elev) }

.nav-toggle{
  display:none; background:none; border:0; padding:.3rem; border-radius:.4rem;
}
.nav-toggle-bar{
  display:block; width:22px; height:2px; background:var(--text); margin:4px 0;
}

/* Hero */
.hero{
  min-height: 68vh;
  display:grid; place-items:center;
}
.hero-content{
  text-align:center;
  max-width:800px;
}
.hero h1{
  font-size: clamp(2rem, 1.4rem + 2.2vw, 3rem);
  line-height:1.1; margin:.2rem 0 .6rem;
}
.hero-cta{ display:flex; justify-content:center; gap:.8rem; margin-top:1rem }

/* Cards */
.card{
  background: var(--card);
  border:1px solid var(--border);
  border-radius: 0;
  padding: 1.1rem 1.1rem .9rem;
  box-shadow: var(--shadow);
  margin: 1rem 0;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease, background-color .25s ease, opacity .25s ease;
}
.card-head{
  display:flex; align-items:flex-start; justify-content:space-between; gap:1rem;
  margin-bottom:.5rem;
}
.card-list{ margin:.3rem 0 0 1rem }
.card-list li{ margin:.35rem 0 }

/* Grid tiles */
.grid{
  display:grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}
.tile{
  grid-column: span 12;
  border:1px solid var(--border);
  border-radius:0;
  background: var(--card);
  padding: 1rem;
  display:flex; flex-direction:column; gap:.8rem;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease, background-color .25s ease, opacity .25s ease;
}
.tile-foot{
  display:flex; gap:1rem; margin-top:auto;
}

/* Chips */
.chip-list{
  display:flex; flex-wrap:wrap; gap:.5rem; padding:0; margin:0; list-style:none;
}
.chip{
  background: var(--bg-elev);
  border:1px solid var(--border);
  color: var(--muted);
  padding:.45rem .6rem;
  border-radius:0;
  font-size:.9rem;
}

/* Skills categories */
.skills-grid{
  display:grid; gap:16px;
  grid-template-columns: repeat(12, 1fr);
}
.skill-cat{
  grid-column: span 12;
  background: var(--card);
  border:1px solid var(--border);
  padding: 1rem;
  box-shadow: var(--shadow);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease, background-color .25s ease, opacity .25s ease;
}
.skill-head{
  display:flex; align-items:center; gap:.6rem; margin-bottom:.6rem;
}
.skill-icon{
  display:inline-grid; place-items:center;
  width:28px; height:28px; color: var(--muted);
  border:none; background: transparent;
}
.skill-cat h3{ margin:0; font-size:1rem }

/* Icons inside skill icon wrapper */
.skill-icon i{ font-size: 16px }

/* About layout */
.about-grid{
  display:grid; grid-template-columns: 1.3fr .9fr; gap: 28px; align-items: center;
}
.about-photo{
  display:block; width:100%; height:auto; background: var(--bg-elev); border:1px solid var(--border);
  aspect-ratio: 1; 
}
.about-photo img{ display:block; width:100%; height:100%; object-fit: cover }

/* Meta rows for Experience/Education */
.meta-row{
  display:flex; align-items:flex-start; justify-content:space-between; gap:1rem;
}
.meta-left{ display:flex; flex-direction:column; gap:.25rem }
.meta-right{
  color: var(--muted);
  min-width: 180px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}
.org-tag{
  display:inline-block;
  padding:.2rem .5rem;
  border:1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text);
  letter-spacing:.1px;
}
.meta-line{
  color: var(--muted);
  display:flex; align-items:center; gap:.4rem;
}
.meta-line i{ color: var(--muted) }

/* Contact list */
.contact-list{
  list-style:none; padding:0; margin:0; display:grid; gap:.5rem;
}
.contact-list li{
  display:flex; align-items:center; gap:.6rem;
}
.contact-list i{
  width:20px; text-align:center; color: var(--muted);
}
.contact-list a{ color: var(--text); text-decoration:none; border-bottom:1px dashed var(--border) }
.contact-list a:hover{ border-color: var(--accent) }

/* Contact */
.contact-block p{ margin:.2rem 0 }

/* Hover micro-interactions */
.card:hover{ transform: translateY(-3px); box-shadow: 0 16px 40px rgba(0,0,0,.35); border-color: color-mix(in oklab, var(--border) 60%, var(--accent) 40%); }
.skill-cat:hover{ transform: translateY(-2px); box-shadow: 0 14px 36px rgba(0,0,0,.33); border-color: var(--border); }
.tile:hover{ transform: translateY(-2px); box-shadow: 0 14px 36px rgba(0,0,0,.33); border-color: color-mix(in oklab, var(--border) 55%, var(--accent) 45%); }

.chip{ transition: transform .2s ease, border-color .2s ease, color .2s ease, background-color .2s ease }
.chip:hover{ transform: translateY(-1px); border-color: var(--accent); color: var(--text) }

/* Focus visibility for accessibility */
a:focus-visible, button:focus-visible, .chip:focus-visible, .tile:focus-visible, .card:focus-visible, .skill-cat:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Company/School hierarchy */
.card-head h3{
  font-size: clamp(1.05rem, 1rem + .4vw, 1.25rem);
  line-height: 1.2;
  margin: 0 0 .2rem;
}
.card-head .org{
  color: var(--text);
  font-weight: 700;
  letter-spacing: .1px;
}
.card-head .muted{
  color: var(--muted);
}

/* Section title accent underline on section hover */
.section-title{ position: relative; }
.section-title::after{
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 36px; height: 2px;
  background: var(--border);
  transition: background-color .25s ease, width .25s ease;
}
.section:hover .section-title::after{
  background: var(--accent);
  width: 56px;
}

/* Languages */
.lang-grid{
  display:grid; grid-template-columns: repeat(12,1fr); gap: 12px;
}
.lang-item{
  grid-column: span 12;
  display:flex; align-items:center; justify-content:space-between;
  border:1px solid var(--border); background: var(--card); padding:.6rem .8rem;
}
.lang-name{ font-weight:600 }
.lang-level{ color: var(--muted) }

/* Footer */
.site-footer{
  padding: 40px 0;
  border-top:1px solid var(--border);
  background: var(--bg-elev);
}
.site-footer p{ margin:0; text-align:center }

.footer-grid{
  display:grid; grid-template-columns: 1fr 1fr 1fr; align-items:center; gap: 12px;
}
.footer-brand{
  font-weight:700; letter-spacing:.2px;
}
.footer-copy{
  text-align:center;
}
.footer-links{
  display:flex; gap:1rem; justify-content:flex-end;
}
.footer-links a{
  color: var(--muted); text-decoration:none; padding:.2rem .3rem;
  border:1px solid transparent;
}
.footer-links a:hover{
  color: var(--text); border-color: var(--border); background: var(--bg-elev);
}

/* To top */
.to-top{
  position: fixed; right:18px; bottom:18px; z-index:1200;
  width:42px; height:42px; border-radius:999px; border:1px solid var(--border);
  background: var(--bg-elev); color:var(--text);
  display:grid; place-items:center;
  box-shadow: var(--shadow);
  opacity:0; visibility:hidden; transform: translateY(8px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s;
}
.to-top.show{ opacity:1; visibility:visible; transform: translateY(0) }

/* Reveal animations */
.reveal{ opacity:0; transform: translateY(10px); transition: opacity .6s ease, transform .6s ease }
.reveal.in{ opacity:1; transform: translateY(0) }
.delay-1{ transition-delay:.08s }
.delay-2{ transition-delay:.16s }

/* Responsive */
@media (min-width: 720px){
  .tile{ grid-column: span 6 }
  .skill-cat{ grid-column: span 6 }
}
@media (min-width: 980px){
  .tile{ grid-column: span 4 }
  .skill-cat{ grid-column: span 4 }
}

@media (max-width: 900px){
  .site-nav{
    position: absolute; top:58px; right:0; left:0;
    margin: 0 auto; width:min(92%, 1100px);
    background: var(--bg-elev);
    border:1px solid var(--border);
    border-radius:0;
    padding:.6rem;
    display:none; flex-direction:column; gap:.4rem;
  }
  .site-nav.open{ display:flex }
  .nav-toggle{ display:block }
}