:root {
  --primary: #4caf50;
  --beige: #efe7d9;
  --white: #fff;
  --text: #2d3a3a;
  --border-radius: 22px;
  --transition: all 0.25s cubic-bezier(.4,0,.2,1);
  --papercraft-shadow: 6px 10px 22px rgba(0,0,0,0.12), 0 1px 0 rgba(0,0,0,0.08);
  --paper-texture: url('https://www.transparenttextures.com/patterns/paper-fibers.png');
}

body {
  background: var(--beige) var(--paper-texture);
  color: var(--text);
  font-family: 'Montserrat', Arial, sans-serif;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  background-size: 440px 440px;
}

header, footer {
  background: var(--primary);
  color: var(--white);
  box-shadow: var(--papercraft-shadow);
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  margin-bottom: 32px;
}

header {
  padding: 24px 0 18px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav ul {
  display: flex;
  justify-content: center;
  gap: 32px;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav a {
  color: var(--white);
  font-weight: 600;
  font-size: 1.1rem;
  padding: 10px 18px;
  border-radius: var(--border-radius);
  transition: var(--transition);
  position: relative;
}

nav a:hover, nav a.active {
  background: var(--white);
  color: var(--primary);
  box-shadow: var(--papercraft-shadow);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 16px 0 16px;
}

.section-title {
  font-size: 2.3rem;
  text-align: center;
  margin-bottom: 36px;
  color: var(--primary);
  background: var(--white);
  display: inline-block;
  padding: 12px 32px;
  border-radius: var(--border-radius);
  box-shadow: var(--papercraft-shadow);
  position: relative;
  left: 50%;
  transform: translateX(-50%) rotate(-2deg);
  letter-spacing: 1px;
  background-image: var(--paper-texture);
}

.card-collage,
.domain-card,
.project-card,
.event-card {
  background: var(--white) var(--paper-texture);
  border-radius: var(--border-radius);
  box-shadow: var(--papercraft-shadow);
  margin: 32px 0;
  padding: 32px 28px 28px 28px;
  position: relative;
  z-index: 1;
  overflow: visible;
  transform: rotate(-2deg);
}

.card-collage::before,
.domain-card::before,
.project-card::before,
.event-card::before {
  content: '';
  position: absolute;
  top: 12px;
  left: 18px;
  width: 95%;
  height: 97%;
  background: var(--primary);
  opacity: 0.09;
  border-radius: calc(var(--border-radius) * 1.2);
  filter: blur(2.5px);
  z-index: -1;
  transform: rotate(2.5deg);
}

.card-collage:not(:first-child),
.domain-card:not(:first-child),
.project-card:not(:first-child),
.event-card:not(:first-child) {
  margin-top: -22px;
  box-shadow: var(--papercraft-shadow);
}

h1, h2, h3 {
  font-family: 'Raleway', Arial, sans-serif;
  font-weight: 700;
  margin-top: 0;
  margin-bottom: 18px;
  color: var(--primary);
}

.btn, button, input[type="submit"] {
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 18px;
  padding: 10px 32px;
  font-weight: 600;
  cursor: pointer;
  font-size: 1.1rem;
  box-shadow: var(--papercraft-shadow);
  transition: var(--transition);
  text-decoration: none;
  display: inline-block;
  margin: 10px 0;
}

.btn:hover, button:hover, input[type="submit"]:hover {
  background: #388e3c;
  color: var(--white);
  transform: translateY(-2px) scale(1.04) rotate(-1deg);
}

ul, ol {
  margin: 18px 0 18px 24px;
}

li {
  margin-bottom: 8px;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: underline;
  transition: color .2s;
}

a:hover {
  color: #388e3c;
}

img, .img-collage {
  border-radius: 16px;
  box-shadow: var(--papercraft-shadow);
  margin: 16px 0;
  background: var(--white);
  display: block;
  max-width: 100%;
  background-image: var(--paper-texture);
  background-size: 120%;
}

figure {
  margin: 0;
}

figcaption {
  font-size: 0.97rem;
  color: #555;
  margin-top: 4px;
  text-align: center;
}

footer {
  margin-top: 60px;
  padding: 36px 0 18px 0;
  text-align: center;
  font-size: 1rem;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  background: var(--primary);
  color: var(--white);
  box-shadow: var(--papercraft-shadow);
}

.papercraft-shape {
  position: absolute;
  box-shadow: var(--papercraft-shadow);
  border-radius: 18% 22% 20% 25% / 25% 20% 18% 22%;
  background-blend-mode: multiply;
  background-image: var(--paper-texture);
  background-size: 120%;
  transition: box-shadow 0.18s;
  opacity: 0.5;
  z-index: 0;
}

/* Grilles */
.domains-grid, .projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

/* Responsive */
@media (max-width: 900px) {
  main { padding: 20px 4vw 0 4vw; }
  .section-title { font-size: 1.5rem; padding: 9px 18px; }
  .card-collage { padding: 18px 8px 18px 8px; }
  .domains-grid, .projects-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 600px) {
  nav ul { gap: 14px; }
  .section-title { font-size: 1.2rem; }
  .card-collage { font-size: 0.98rem; }
  .domains-grid, .projects-grid { grid-template-columns: 1fr; }
}