body {
  margin: 0;
  font-family: "Poppins", Arial, sans-serif;
  background: #e0f7fa;
  color: #004d40;
  scroll-behavior: smooth;
}

/* HEADER */
header {
  text-align: center;
  background: linear-gradient(180deg, #00bcd4, #4dd0e1);
  color: white;
  padding: 1.2em 1em;
  position: sticky; top: 0; z-index: 10;
}

.slogan { font-style: italic; margin: 0.3em 0 1em; }

nav a {
  margin: 0 10px;
  color: white;
  text-decoration: none;
  font-weight: bold;
}
nav a:hover { color: #ffe082; }

.hamburger {
  display: none;
  color: white;
  font-size: 1.8em;
  cursor: pointer;
}

/* HERO */
.hero {
  position: relative;
  background: url('https://i.ibb.co/DYZhLxL/ocean-cleanup.jpg') center/cover no-repeat;
  color: white;
  padding: 6em 1em;
}
.hero-content {
  background: rgba(0, 77, 64, 0.6);
  padding: 2em;
  border-radius: 10px;
  max-width: 700px;
  margin: auto;
}
.cta-btn {
  display: inline-block;
  margin-top: 1em;
  padding: 0.6em 1.4em;
  background: #ff7043;
  color: white;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}
.cta-btn:hover { background: #f4511e; }

/* WAVE */
.wave {
  position: absolute; bottom: 0; left: 0;
  width: 100%; height: 100px;
  background: url('https://svgshare.com/i/ubR.svg');
  background-size: 1000px 100px;
  animation: wave 6s linear infinite;
  opacity: 0.8;
}
@keyframes wave { 0% {background-position-x:0;} 100% {background-position-x:1000px;} }

/* GENERAL SECTIONS */
.section { padding: 3em 1em; text-align: center; }
.light { background: #b2dfdb; }
.about-section { font-size: 1.1em; line-height: 1.6; }

/* CARDS */
.achievement-cards {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 2em; margin-top: 2em;
}
.card {
  background: #ffffff;
  width: 280px;
  border-radius: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  padding: 1em;
  transition: transform 0.3s, box-shadow 0.3s;
}
.card:hover { transform: scale(1.05); box-shadow: 0 4px 10px rgba(0,0,0,0.3); }
.card img { width: 100%; border-radius: 10px; }

/* COUNTERS */
.stats { display: flex; justify-content: center; flex-wrap: wrap; gap: 2em; }
.stat { background: white; padding: 1.5em; border-radius: 8px; width: 180px; box-shadow: 0 2px 5px rgba(0,0,0,0.2); }
.counter { font-size: 2em; color: #00796b; font-weight: bold; }

/* BEFORE / AFTER SLIDER */
.img-compare { position: relative; width: 80%; max-width: 600px; margin: auto; overflow: hidden; border-radius: 10px; }
.img-wrapper img { width: 100%; display: block; }
.img-overlay { position: absolute; top: 0; left: 0; width: 50%; overflow: hidden; border-right: 2px solid #ff7043; transition: width 0.3s; }
.slider { width: 80%; margin-top: 1em; }

/* PLASTIC SIMULATOR */
.plastic-section { text-align: center; }
.plastic-items { display: flex; justify-content: center; gap: 2em; margin-top: 1em; }
.plastic { background: #004d40; color:white; padding: 1em; border-radius:8px; width:150px; opacity: 1; transition: opacity 0.5s; }

/* QUIZ */
.quiz-section { margin-top: 2em; }
.quiz-btn {
  padding: 0.6em 1.2em; background: #00bcd4; border: none; color: white;
  border-radius: 5px; cursor: pointer; font-weight: bold;
}
.quiz-btn:hover { background: #0097a7; }

/* TAKE ACTION */
#take-action ul {
  list-style:none;
  padding:0;
  text-align:left;
  max-width:400px;
  margin:auto;
}
.takeaction ul li { margin-bottom: 0.4em; }

/* FOOTER */
footer {
  text-align: center; background: #004d40; color: white; padding: 1em; font-size: 0.9em;
}
footer a { color: #ffccbc; text-decoration: none; margin: 0 5px; }

/* RESPONSIVE */
@media (max-width: 768px) {
  nav { display: none; flex-direction: column; }
  nav.active { display: flex; }
  .hamburger { display: block; }
  .achievement-cards { flex-direction: column; align-items: center; }
}