:root{
  --blue:#133276;
  --blue-2:#0f2a63;
  --gold:#c8a64b;
  --text:#0b1220;
  --muted:#556073;
  --bg:#f4f7ff;
  --card:#ffffff;
  --border: rgba(16, 24, 40, 0.14);
  --shadow: 0 18px 45px rgba(15, 42, 99, 0.14);
  --radius: 26px;
  --max: 1100px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background:
    radial-gradient(900px 420px at 20% 10%, rgba(19,50,118,0.10), transparent 60%),
    radial-gradient(800px 420px at 85% 15%, rgba(200,166,75,0.10), transparent 62%),
    linear-gradient(180deg, #ffffff 0%, var(--bg) 100%);
  overflow-x:hidden;
}

/* micro animation background */
body::before{
  content:"";
  position:fixed;
  inset:-20%;
  background:
    radial-gradient(420px 240px at 30% 40%, rgba(19,50,118,0.12), transparent 60%),
    radial-gradient(360px 220px at 75% 55%, rgba(200,166,75,0.10), transparent 65%);
  filter: blur(18px);
  opacity: .9;
  animation: floatBg 10s ease-in-out infinite;
  pointer-events:none;
  z-index:-1;
}

@keyframes floatBg{
  0%,100%{ transform: translate3d(0,0,0) scale(1); }
  50%{ transform: translate3d(10px,-8px,0) scale(1.02); }
}

/* Header */
.header{
  position: sticky;
  top: 0;
  z-index: 5;
  background: rgba(255,255,255,0.75);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(16, 24, 40, 0.06);
}

.header-container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 18px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}

.brand{ display:inline-flex; align-items:center; text-decoration:none; }
.logo{
  height: 54px;          /* logo un peu plus grand */
  width: auto;
  display:block;
  transform: translateZ(0);
  transition: transform .25s ease;
}
.brand:hover .logo{ transform: scale(1.03); }

.header-contact{
  color: var(--blue);
  font-weight: 700;
  text-decoration: none;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(19,50,118,0.18);
  transition: transform .18s ease, background .18s ease, border-color .18s ease;
}
.header-contact:hover{
  transform: translateY(-1px);
  background: rgba(19,50,118,0.06);
  border-color: rgba(19,50,118,0.30);
}

/* Layout */
.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 56px 18px 70px;
  text-align:center;
}

.hero h1{
  margin: 0 auto;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--blue);
}

.subtitle{
  margin: 18px auto 0;
  font-size: clamp(16px, 2vw, 20px);
  color: var(--muted);
}

.authority{
  margin: 16px auto 0;
  max-width: 820px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

/* Card */
.card{
  margin: 44px auto 0;
  max-width: 760px;
  background: var(--card);
  border: 1px solid rgba(16, 24, 40, 0.08);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 34px 26px 24px;
  text-align:center;
  opacity: 0;
  transform: translateY(10px);
  animation: cardIn .55s ease forwards;
}
@keyframes cardIn{
  to{ opacity:1; transform: translateY(0); }
}

.card h2{
  margin: 0;
  font-size: clamp(24px, 2.8vw, 34px);
  color: #0b1220;
  letter-spacing: -0.01em;
}

.card-subtitle{
  margin: 10px auto 18px;
  max-width: 640px;
  color: var(--muted);
  line-height: 1.55;
}

/* Form */
.lead-form{
  margin: 0 auto;
  max-width: 560px;
  display:flex;
  flex-direction: column;
  gap: 14px;
}

input, select{
  width: 100%;
  padding: 16px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  font-size: 16px;
  outline: none;
  background: #fff;
  transition: border-color .18s ease, box-shadow .18s ease, transform .18s ease;
}

input:focus, select:focus{
  border-color: rgba(19,50,118,0.45);
  box-shadow: 0 0 0 6px rgba(19,50,118,0.10);
}

.btn{
  position: relative;
  width: 100%;
  border: none;
  border-radius: 18px;
  padding: 18px 20px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.4px;
  cursor: pointer;
  color: #fff;
  background: linear-gradient(135deg, #133276 0%, #0f2a63 100%);
  box-shadow: 
    0 18px 40px rgba(19,50,118,0.25),
    inset 0 1px 0 rgba(255,255,255,0.2);
  transition: all 0.25s ease;
  overflow: hidden;
}

.btn:hover{
  transform: translateY(-2px);
  box-shadow: 
    0 22px 50px rgba(19,50,118,0.35),
    0 0 0 2px rgba(200,166,75,0.4);
}

.btn:active{
  transform: translateY(0px);
}

/* Messages */
.form-note{
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.success-message{
  margin: 10px 0 0;
  padding: 12px 12px;
  border-radius: 14px;
  background: rgba(19,50,118,0.06);
  border: 1px solid rgba(19,50,118,0.14);
  color: var(--blue);
  font-weight: 700;
}

.error-message{
  margin: 10px 0 0;
  padding: 12px 12px;
  border-radius: 14px;
  background: rgba(220,38,38,0.06);
  border: 1px solid rgba(220,38,38,0.18);
  color: #b91c1c;
  font-weight: 700;
}

.privacy-note{
  margin: 12px 0 0;
  color: rgba(85,96,115,0.85);
  font-size: 12px;
  line-height: 1.45;
}

/* A11y */
.sr-only{
  position:absolute;
  width:1px;height:1px;
  padding:0;margin:-1px;
  overflow:hidden;clip:rect(0,0,0,0);
  white-space:nowrap;border:0;
}

/* Responsive */
@media (max-width: 520px){
  .header-container{ padding: 12px 14px; }
  .logo{ height: 48px; }
  .container{ padding: 42px 14px 60px; }
  .card{ padding: 26px 16px 18px; border-radius: 22px; }
}