*{box-sizing: border-box;}
html
body {
    --border-radius: 600px;
    --blue: #7992FF;
    --darkblue:#1C47FF;
    --orange: #FF6600;
    --red: #FE1B00; 
    --green: #F2FFD5;
    --black: #202020;
    --darkgrey: #3F3F3F;
    --gutter: 3.125vw 4.5vw;
    --background: #F0F0F0;
    --lightgreen: #a4ffde;

    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background: var(--darkgrey);
    color: var(--darkblue);
    font-size: 20px;
    font-family: 'Syne', sans-serif;
    font-optical-sizing: auto;
    font-weight: 400;
    font-style: normal;}

main {margin-top: 100px;}

h1 {font-size: 80px;
    margin: 0px;}

h2 {font-size: 60px;
    margin: 0px;}

a {color: var(--orange);
    text-decoration: none;}

section {
    width: 100%;
    display: flex;
    min-height: 80px;
    margin-bottom: 50px}

/* navigation */
nav {position: fixed;
    width: 100%;
    height: 100px;
    top: 0;
    left: 0;
    z-index: 9999;
    margin: 0;
    padding: 0;
    background: var(--darkgrey);}
nav ul {display: inline-flex;
    align-items: center;
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;}
nav ul li {list-style: none;
    margin-left: 45px;}
nav ul li a {
    font-family: 'Doto', sans-serif;
    font-optical-sizing:none;
    font-weight: 200;
    font-style: normal;
    font-variation-settings: "ROND" 100;
    font-size: 30px;
    flex: 1;
    display: flex;
    flex-direction: column;
    flex-basis: 10vw;}
nav ul li a:hover {
    color: var(--darkblue);
    padding: 10px;
    background-color:var(--green);
    border-radius: 40px;}

.line-container {
    width: 100%;           /* largeur de la section */
    height: 1px;
    margin: 0;
    padding: 0;         /* hauteur de la ligne (ou plus fine) */
    overflow: hidden;
    position: relative;}
.fixed-line {
    width: 100%;           /* largeur de la section */
    height: 2px;
    top: 100px;  
    margin: 0;
    padding: 0;         /* hauteur de la ligne (ou plus fine) */
    overflow: hidden;
    position: fixed;}
.animated-line {
    width: 0%;             /* commence à 0 */
    height: 2px;
    margin: 0;
    padding: 0; 
    background-color: var(--green);
    animation: drawLine 2s forwards; /* animation de 2s */}
@keyframes drawLine {
    from {width: 0%;}
    to {width: 100%;}}

/* page */
body {
  background: #f5f5f2;
  overflow-x: hidden;
}

.interactive-form {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  padding: 60px 0;
}

/* Bulles */
.blob {
  margin: 150px 0px 0px 0px;  
  width: 420px;
  height: 220px;
  background: var(--green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    inset 0 0 30px rgba(28,71,255,1),
    0 30px 60px rgba(255, 102, 0, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.2s ease;
  position: relative;
  animation: morph 10s ease-in-out infinite;
}

/* Bulles organiques */
@keyframes morph {
  0% { border-radius: 55% 45% 60% 40% / 50% 55% 45% 50%; }
  50% { border-radius: 45% 55% 50% 50% / 55% 45% 50% 50%; }
  100% { border-radius: 55% 45% 60% 40% / 50% 55% 45% 50%; }
}

.blob input,
.blob textarea {
  background: transparent;
  border: none;
  outline: none;
  text-align: center;
  font-size: 25px;
  width: 70%;
  font-family: inherit;
  color: #111;
}

.blob-message {
  width: 600px;
  height: 600px;
  margin: 0px;
  background: var(--green);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow:
    inset 0 0 30px rgba(28,71,255,1),
    0 30px 60px rgba(255, 102, 0, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform 0.2s ease;
  position: relative;
}


.blob-message textarea {
  height: 140px;
  resize: none;
}

.blob-send {
  width: 160px;
  height: 160px;
  background: var(--darkblue);
  color: var(--green);
  box-shadow:
    inset 0 30px 60px rgba(250, 255, 209, 0.18),0 0 30px rgba(28,71,255, 0.6);
  font-size: 16px;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 16px 40px rgba(0,0,0,0.25);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.blob-send:hover {
  transform: scale(1.08);
  box-shadow: 0 24px 60px rgba(0,0,0,0.35);
}

/* Mobile */
@media (max-width: 768px) {
  .blob {
    width: 180px;
    height: 180px;
  }

  .blob-message {
    width: 220px;
    height: 220px;
  }
}