.wec-timeline {
  --wec-blue: #315f9f;
  --wec-light-blue: #eef5fb;
  --wec-dark: #1d2b3a;
  --wec-border: #d9e4ef;
  --wec-gold: #d7a94b;
  max-width: 1100px;
  margin: 50px auto;
  padding: 0 20px;
}

.wec-timeline * {
  box-sizing: border-box;
}

.wec-timeline__intro {
  text-align: center;
  margin-bottom: 30px;
}

.wec-timeline__intro h2 {
  color: var(--wec-blue);
  font-size: clamp(2rem, 4vw, 3rem);
  margin: 0 0 10px;
}

.wec-timeline__intro p {
  max-width: 720px;
  margin: 0 auto;
  color: var(--wec-dark);
  font-size: 1.1rem;
}

.wec-timeline__filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 35px;
}

.wec-filter {
  border: 1px solid var(--wec-blue);
  background: #fff;
  color: var(--wec-blue);
  padding: 10px 18px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 700;
  transition: all 0.25s ease;
}

.wec-filter:hover,
.wec-filter.active {
  background: var(--wec-blue);
  color: #fff;
}

.wec-timeline__list {
  position: relative;
}

.wec-timeline__list:before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 105px;
  width: 3px;
  background: var(--wec-border);
}

.wec-item {
  position: relative;
  margin-bottom: 18px;
  padding-left: 150px;
}

.wec-item:before {
  content: "";
  position: absolute;
  left: 96px;
  top: 25px;
  width: 21px;
  height: 21px;
  background: var(--wec-gold);
  border: 4px solid #fff;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--wec-border);
  z-index: 2;
}

.wec-item.is-hidden {
  display: none;
}

.wec-item__toggle {
  width: 100%;
  text-align: left;
  border: 1px solid var(--wec-border);
  background: #fff;
  border-radius: 14px;
  padding: 20px 55px 20px 24px;
  cursor: pointer;
  box-shadow: 0 8px 25px rgba(29, 43, 58, 0.08);
  position: relative;
  transition: all 0.25s ease;
}

.wec-item__toggle:hover {
  border-color: var(--wec-blue);
  transform: translateY(-2px);
}

.wec-item__toggle:after {
  content: "+";
  position: absolute;
  right: 24px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--wec-blue);
  font-size: 2rem;
  line-height: 1;
}

.wec-item.is-open .wec-item__toggle {
  border-radius: 14px 14px 0 0;
}

.wec-item.is-open .wec-item__toggle:after {
  content: "−";
}

.wec-year {
  display: block;
  color: var(--wec-blue);
  font-size: 1.65rem;
  line-height: 1.1;
  font-weight: 800;
  margin-bottom: 6px;
}

.wec-title {
  display: block;
  color: var(--wec-dark);
  font-size: 1.05rem;
  font-weight: 700;
}

.wec-item__content {
  display: none;
  background: var(--wec-light-blue);
  border: 1px solid var(--wec-border);
  border-top: 0;
  border-radius: 0 0 14px 14px;
  padding: 22px 28px;
}

.wec-item.is-open .wec-item__content {
  display: block;
}

.wec-item__content ul {
  margin: 0;
  padding-left: 20px;
}

.wec-item__content li {
  margin-bottom: 10px;
  color: var(--wec-dark);
  line-height: 1.55;
}

.wec-item__content li:last-child {
  margin-bottom: 0;
}

@media (max-width: 767px) {
  .wec-timeline {
    margin: 35px auto;
    padding: 0 15px;
  }

  .wec-timeline__list:before {
    left: 15px;
  }

  .wec-item {
    padding-left: 45px;
  }

  .wec-item:before {
    left: 6px;
  }

  .wec-item__toggle {
    padding: 18px 48px 18px 18px;
  }

  .wec-year {
    font-size: 1.4rem;
  }
}