:root {
  --accent: #2e7dff;
  --accent2: #4bc2ff;
  --bg: #f7f9fc;
  --txt: #111;
  --card-bg: #fff;
  --header-bg: rgba(255,255,255,.75);
}

body.dark {
  --bg: #0d1117;
  --txt: #f0f0f0;
  --card-bg: #161b22;
  --header-bg: rgba(22,27,34,.9);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
  font-family: 'Segoe UI', Roboto, sans-serif;
  transition: background .3s, color .3s;
}

body {
  background: var(--bg);
  color: var(--txt);
  line-height: 1.7;
  font-size: 1rem;
  opacity: 0;
  transition: background-color 0.4s ease, color 0.4s ease, opacity 0.4s ease;
}
body.loaded { opacity: 1; }

header {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: blur(10px);
  background: var(--header-bg);
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.5rem; box-shadow: 0 1px 3px rgba(0,0,0,.08);
}

nav a {
  margin-left: 1rem; text-decoration: none; color: var(--txt);
  font-weight: 500; position: relative;
}
nav a::after {
  content:""; position:absolute; left:0; bottom:-3px;
  width:0; height:2px; background:var(--accent);
  transition:width .3s;
}
nav a:hover::after { width:100%; }

.theme-toggle {
  margin-left: 1rem;
  background: none; border: 2px solid var(--accent);
  color: var(--accent); border-radius: 20px;
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
  cursor: pointer;
}
.theme-toggle:hover { background: var(--accent); color: #fff; }

.hero {
  display:flex; flex-direction:column; justify-content:center; align-items:center;
  text-align:center; padding: 6rem 1rem 5rem;
  background:linear-gradient(135deg,var(--accent) 0%,var(--accent2) 100%);
  color:#fff;
}
.hero h1{ font-size: clamp(2.2rem, 5vw, 3.5rem); margin-bottom:.8rem; font-weight:700; }
.hero p{ font-size: clamp(1rem, 2.5vw, 1.25rem); max-width:40ch; }
.cta{
  margin-top:2rem; padding:1rem 2rem; border:none; border-radius:14px;
  background:#fff; color:var(--accent); font-weight:600; cursor:pointer;
}
.cta:hover{ transform:scale(1.05); box-shadow:0 8px 18px rgba(0,0,0,.15); }

section{ padding:3rem 1rem; max-width:1100px; margin:0 auto; }
section h2{ font-size: clamp(1.5rem,3vw,2rem); margin-bottom:1rem; text-align:center; }

.grid{ display:grid; gap:1.5rem; }
.about-grid{ grid-template-columns:repeat(auto-fit,minmax(250px,1fr)); }

.card{
  background: var(--card-bg); border-radius:14px; padding:1.5rem;
  box-shadow:0 3px 10px rgba(0,0,0,.06);
  opacity: 0; transform: translateY(30px);
}
.card.visible{ opacity:1; transform: translateY(0); transition: transform .6s ease, opacity .6s ease; }
.card:hover{ transform:translateY(-5px); box-shadow:0 10px 18px rgba(0,0,0,.1); }

#contact p{ text-align:center; font-size:1.1rem; }

footer{
  background:#111; color:#ccc; text-align:center;
  padding:1.5rem 1rem; font-size:.9rem;
}
footer a{ color:var(--accent2); }

/* Canvas pour animations Light/Dark */
#themeCanvas {
  position: fixed;
  top:0; left:0;
  width: 100vw; height: 100vh;
  pointer-events: none;
  z-index: 999;
}