:root{
  --text: #1a1a1a;
  --muted: rgba(26,26,26,.75);
  --glass: rgba(255,255,255,.55);
  --glass-border: rgba(255,255,255,.35);
}

*{box-sizing:border-box}
html{ scroll-behavior: smooth; }

body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background:#f5f5f5;
}

/* HERO */
.hero{
  min-height: 100vh;
  background-image: url("../assets/fond.png"); /* <-- IMPORTANT : ton image renommée fond.png */
  background-size: cover;
  background-position: center;
  position: relative;
  overflow: hidden;
}

/* couche légère pour lisibilité */
.hero::before{
  content:"";
  position:absolute; inset:0;
  background: radial-gradient(circle at 40% 30%,
    rgba(255,255,255,.55) 0%,
    rgba(255,255,255,.35) 45%,
    rgba(240,240,240,.15) 100%);
  pointer-events:none;
}

.header{
  position: relative;
  z-index: 2;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 28px 56px;
  gap: 24px;
}

.brand{
  font-weight: 700;
  letter-spacing: .5px;
  font-size: 28px;
}
.brand span{
  font-weight: 600;
  opacity: .85;
}

.nav{
  display:flex;
  gap: 18px;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.nav-link{
  text-decoration:none;
  color: var(--text);
  font-weight: 600;
  letter-spacing: .6px;
  font-size: 12px;
  padding: 10px 12px;
  border-radius: 999px;
  text-transform: uppercase;
}
.nav-link:hover{
  background: rgba(255,255,255,.65);
}

/* contenu hero */
.content{
  position: relative;
  z-index: 2;
  max-width: 1100px;
  margin: 0 auto;
  padding: 100px 56px 56px;
  text-align: center;
}

.title{
  font-size: clamp(28px, 4vw, 54px);
  line-height: 1.05;
  margin: 0 auto 14px;
  letter-spacing: .2px;
  max-width: 1000px;
}

.title::after{
  content: '|';
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}

@keyframes blink {
  0%, 50% { opacity: 1; }
  51%, 100% { opacity: 0; }
}

.subtitle{
  font-size: clamp(14px, 1.5vw, 18px);
  max-width: 720px;
  margin: 0;
  color: var(--muted);
}

.cta{
  margin-top: 18px;
  display:flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn{
  display:inline-block;
  padding: 10px 14px;
  border-radius: 12px;
  background: #111;
  color: #fff;
  font-weight: 700;
  text-decoration:none;
  border: 0;
  cursor: pointer;
}
.btn-ghost{
  background: rgba(255,255,255,.7);
  color: #111;
  border: 1px solid rgba(0,0,0,.12);
}

/* sections */
.section{
  padding: 72px 0;
  background: #fff;
}
.section-soft{
  background: #f6f6f6;
}

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

.section-title{
  margin: 0 0 8px;
  font-size: 26px;
  text-align: center;
}
.section-desc{
  margin: 0 auto 22px;
  color: var(--muted);
  text-align: center;
}

/* projets */
.grid{
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.card{
  padding: 18px;
  border-radius: 16px;
  background: rgba(255,255,255,0.85);
  border: 1px solid rgba(0,0,0,0.08);
}
.card h3{
  text-align: center;
}

/* contact */
.form{
  display:grid;
  gap: 12px;
  max-width: 720px;
  margin: 0 auto;
}
.row{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
label{
  display:grid;
  gap: 6px;
  font-weight: 600;
}
input, textarea{
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid rgba(0,0,0,.15);
  background: rgba(255,255,255,.85);
  outline: none;
  font-weight: 500;
}
input:focus, textarea:focus{
  border-color: rgba(0,0,0,.35);
}

.note{
  margin: 6px 0 0;
  color: var(--muted);
  font-size: .95rem;
}

.footer{
  margin-top: 40px;
  color: var(--muted);
  text-align: center;
}

/* Reveal on scroll */
.reveal{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible{
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1; transform:none; transition:none;}
}

/* responsive */
@media (max-width: 720px){
  .header{ padding: 18px 18px; }
  .content{ padding: 70px 18px 24px; }
  .nav{ gap: 10px; }
  .nav-link{ padding: 9px 10px; }
  .row{ grid-template-columns: 1fr; }
}