:root {
    --bg: #0c0d0f; --surface: #13151a; --surface2: #1a1d24;
    --border: rgba(255,255,255,0.07); --text: #e8eaf0; --muted: #7a7f8e;
    --accent-blue: #3b9eff; --accent-orange: #ff6b35; --accent-teal: #00d4aa;
  }
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body { background: var(--bg); color: var(--text); font-family: 'DM Sans', sans-serif; font-size: 15px; line-height: 1.7; overflow-x: hidden; }
  .btn-green {
    background-color: green;  /* couleur de fond */
    color: white;             /* couleur du texte */
    padding: 5px 10px;
    text-decoration: none;
    border-radius: 5px;
}
  nav {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 2.5rem; height: 60px;
    background: rgba(12,13,15,0.92); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
  }
  .nav-logo { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1rem; color: var(--text); text-decoration: none; }
  .nav-links { display: flex; gap: 0.25rem; list-style: none; align-items: center; }
  .nav-links a { color: var(--muted); text-decoration: none; font-size: 0.82rem; font-weight: 500; padding: 0.35rem 0.9rem; border-radius: 6px; transition: color 0.2s, background 0.2s; }
  .nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.06); }
  .nav-links a.btn-blue { color: var(--accent-blue); border: 1px solid rgba(59,158,255,0.3); background: rgba(59,158,255,0.07); }
  .nav-links a.btn-blue:hover { background: rgba(59,158,255,0.14); }
  .nav-links a.btn-teal { color: var(--accent-teal); border: 1px solid rgba(0,212,170,0.3); background: rgba(0,212,170,0.07); }
  .nav-links a.btn-teal:hover { background: rgba(0,212,170,0.14); }

  .hero {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    padding: 100px 2rem 4rem; position: relative; overflow: hidden;
  }
  .hero::before {
    content: ''; position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
    width: 800px; height: 800px;
    background: radial-gradient(circle, rgba(59,158,255,0.06) 0%, transparent 70%);
    pointer-events: none;
  }
  .hero-inner { max-width: 820px; width: 100%; text-align: center; }
  .hero-eyebrow {
    display: inline-flex; align-items: center; gap: 0.5rem;
    font-size: 0.72rem; font-weight: 600; letter-spacing: 0.12em; text-transform: uppercase;
    color: var(--muted); border: 1px solid var(--border); padding: 0.35rem 1rem;
    border-radius: 100px; margin-bottom: 2rem;
  }
  .hero-eyebrow span { width: 6px; height: 6px; background: var(--accent-blue); border-radius: 50%; }
  .hero h1 { font-family: 'Syne', sans-serif; font-size: clamp(2.8rem, 7vw, 5rem); font-weight: 800; line-height: 1.05; letter-spacing: -0.03em; margin-bottom: 1.5rem; }
  .hero h1 em { font-style: normal; color: var(--muted); }
  .hero-sub { font-size: 1rem; color: var(--muted); max-width: 500px; margin: 0 auto 3.5rem; font-weight: 300; }

  .proj-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
  .proj-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
    padding: 2rem; text-align: left; text-decoration: none; color: var(--text);
    display: flex; flex-direction: column; gap: 1rem;
    transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
    position: relative; overflow: hidden;
  }
  .proj-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 2px; opacity: 0; transition: opacity 0.25s; }
  .proj-card.blue::before { background: linear-gradient(90deg, var(--accent-blue), transparent); }
  .proj-card.teal::before { background: linear-gradient(90deg, var(--accent-teal), transparent); }
  .proj-card:hover { transform: translateY(-4px); box-shadow: 0 20px 50px rgba(0,0,0,0.4); }
  .proj-card.blue:hover { border-color: rgba(59,158,255,0.35); }
  .proj-card.blue:hover::before { opacity: 1; }
  .proj-card.teal:hover { border-color: rgba(0,212,170,0.35); }
  .proj-card.teal:hover::before { opacity: 1; }

  .proj-card-tag { font-size: 0.68rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; padding: 0.25rem 0.65rem; border-radius: 4px; display: inline-block; width: fit-content; }
  .proj-card-tag.blue { background: rgba(59,158,255,0.12); color: var(--accent-blue); }
  .proj-card-tag.teal { background: rgba(0,212,170,0.12); color: var(--accent-teal); }
  .proj-card-header { display: flex; align-items: center; gap: 0.75rem; }
  .proj-card-emoji { font-size: 1.6rem; }
  .proj-card-name { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.3rem; letter-spacing: -0.01em; }
  .proj-card-sub { font-size: 0.78rem; color: var(--muted); }
  .proj-card-desc { font-size: 0.87rem; color: var(--muted); line-height: 1.65; }
  .proj-card-pills { display: flex; flex-wrap: wrap; gap: 0.35rem; }
  .pill { font-size: 0.7rem; font-weight: 500; padding: 0.2rem 0.6rem; border-radius: 100px; border: 1px solid var(--border); color: var(--muted); }
  .proj-card-cta { margin-top: auto; display: inline-flex; align-items: center; gap: 0.4rem; font-size: 0.83rem; font-weight: 600; padding: 0.6rem 1.2rem; border-radius: 8px; width: fit-content; }
  .proj-card-cta.blue { background: rgba(59,158,255,0.12); color: var(--accent-blue); }
  .proj-card-cta.teal { background: rgba(0,212,170,0.12); color: var(--accent-teal); }

  footer { border-top: 1px solid var(--border); padding: 2rem; text-align: center; color: var(--muted); font-size: 0.78rem; }

  @media (max-width: 640px) {
    .proj-cards { grid-template-columns: 1fr; }
    nav { padding: 0 1rem; }
    .nav-links { gap: 0.1rem; }
  }