.challenges-hero {
  background-image: linear-gradient(rgba(10, 20, 50, 0.58), rgba(10, 20, 50, 0.88)), url('Peaks-2.webp');
}

.challenges-content {
  padding: 6rem 0;
  background: transparent;
}

/* Challenges Section */
.challenges-intro {
  text-align: center;
  margin-bottom: 4rem;
}

.challenges-intro h2 {
  font-size: clamp(1.4rem, 2.5vw + 0.6rem, 2rem);
  color: #5AA678;
  margin-bottom: 2rem;
}

.challenges-intro p {
  font-size: 1.2rem;
  line-height: 1.8;
  opacity: 0.8;
  max-width: 700px;
  margin: 0 auto 1.5rem;
}

.challenges-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  margin: 3rem auto 0;
}

@media (min-width: 640px) {
  .challenges-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.challenge-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.07);
  padding: 4rem 2.5rem 3rem;
  border-radius: 12px;
  position: relative;
  text-align: center;
  transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              background-color 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              border-color 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              box-shadow 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: flex;
  flex-direction: column;
}

.challenge-card:hover {
  background: rgba(90, 166, 120, 0.07);
  border-color: rgba(90, 166, 120, 0.3);
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.challenge-badge {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: rgba(90, 166, 120, 0.15);
  color: #5AA678;
  border: 1px solid rgba(90, 166, 120, 0.3);
  user-select: none;
}

.construction-banner {
  margin-top: 3rem;
  display: inline-block;
  padding: 0.8rem 2rem;
  background: rgba(90, 166, 120, 0.1);
  border: 1px solid rgba(90, 166, 120, 0.3);
  border-radius: 50px;
  color: #5AA678;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  user-select: none;
}

@keyframes pulse-banner {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.challenge-icon {
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #5AA678;
}

.challenge-card h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: white;
}

.challenge-card p {
  font-size: 1.05rem;
  opacity: 0.8;
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

.challenge-progress {
  margin-top: auto;
  text-align: left;
}

.progress-bar {
  width: 100%;
  height: 10px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 5px;
  overflow: hidden;
  margin-bottom: 0.8rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(to right, #5AA678, #1E8C5A);
  border-radius: 5px;
  transition: width 1s ease-out;
}

.progress-fill--100 { width: 100%; }
.progress-fill--50 { width: 50%; }
.progress-fill--0 { width: 0%; }

.progress-text {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 600;
  display: block;
  text-align: right;
}
/* "Explore" link on challenge card */
.challenge-card-link {
  display: inline-block;
  margin-top: 1.1rem;
  color: #5AA678;
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.22s ease;
}

.challenge-card-link::after {
  content: ' →';
}

.challenge-card-link:hover {
  color: white;
}

/* Planning challenge card variant */
.challenge-card-planning .challenge-badge {
  background: rgba(100, 160, 220, 0.15);
  color: #64A0DC;
  border-color: rgba(100, 160, 220, 0.3);
}

.challenge-card-planning .challenge-icon {
  color: #64A0DC;
}

.challenge-card-planning:hover {
  background: rgba(100, 160, 220, 0.07);
  border-color: rgba(100, 160, 220, 0.3);
}

.challenge-card-planning .progress-fill {
  background: linear-gradient(to right, #64A0DC, #3880B8);
}

.challenge-card-planning .challenge-card-link {
  color: #64A0DC;
}

.achievement-section {
  margin: 5rem auto 0;
  text-align: center;
  max-width: 900px;
}

.achievement-section h2 {
  font-size: clamp(1.4rem, 2.5vw + 0.6rem, 2rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.achievement-section p {
  opacity: 0.7;
  margin-bottom: 2rem;
  font-size: 1rem;
}

.achievement-photo-wrapper {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.5);
}

.achievement-photo {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
}

@media (max-width: 768px) {
  .challenges-content {
    padding: 2.5rem 0;
  }

  .challenges-hero {
    padding: 3rem 1.5rem;
    min-height: 250px;
  }

  .challenges-hero h1 {
    margin-bottom: 0.8rem;
  }

  .challenges-hero p {
    font-size: 1rem;
  }

  .challenges-grid {
    gap: 1.5rem;
  }

  .challenge-card {
    padding: 2rem;
  }

  .challenge-badge {
    top: 1rem;
    right: 1rem;
    font-size: 0.75rem;
    padding: 0.3rem 0.7rem;
  }

  .challenge-card h3 {
    font-size: 1.3rem;
  }

  .achievement-section {
    margin-top: 3rem;
  }
}

@media (max-width: 480px) {
  .challenge-card {
    padding: 1.5rem 1.2rem;
    padding-top: 2.8rem;
  }

  .challenge-card h3 {
    font-size: 1.15rem;
  }
}

.challenge-icon svg {
  width: 1.6rem;
  height: 1.6rem;
  stroke-width: 1.5;
}