.challenges-page {
  padding: 9rem 0;
  background: linear-gradient(
    135deg,
    var(--bg-color) 0%,
    var(--bg-secondary) 100%
  );
  position: relative;
  overflow: hidden;
}

.challenges-page::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="stars" width="20" height="20" patternUnits="userSpaceOnUse"><circle cx="10" cy="10" r="1" fill="%23e5e7eb" opacity="0.2"/></pattern></defs><rect width="100" height="100" fill="url(%23stars)"/></svg>');
  opacity: 0.3;
  z-index: 1;
}

.challenges-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
  z-index: 2;
}

.section-tag {
  display: inline-block;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
  padding: 0.5rem 1.5rem;
  border-radius: 25px;
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 1.5rem;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-color);
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

.section-title .highlight-text {
  display: block;
  font-size: 0.7em;
  color: var(--text-secondary);
  font-weight: 400;
  margin-top: 0.5rem;
}

.section-description {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.challenges-header {
  text-align: center;
  margin-bottom: 4rem;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.coming-soon-alert {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2rem;
  align-items: center;
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: white;
  padding: 2rem;
  border-radius: 20px;
  margin-bottom: 4rem;
  box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
}

.alert-icon {
  width: 60px;
  height: 60px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.alert-icon i {
  font-size: 1.8rem;
}

.alert-content h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.alert-content p {
  opacity: 0.95;
  line-height: 1.5;
}

.alert-countdown {
  text-align: center;
  background: rgba(255, 255, 255, 0.15);
  padding: 1rem;
  border-radius: 15px;
  min-width: 120px;
}

.countdown-label {
  display: block;
  font-size: 0.8rem;
  opacity: 0.8;
  margin-bottom: 0.25rem;
}

.countdown-number {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
}

.countdown-unit {
  display: block;
  font-size: 0.9rem;
  opacity: 0.9;
}

.categories-section {
  margin-bottom: 5rem;
}

.categories-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-color);
  text-align: center;
  margin-bottom: 1rem;
}

.categories-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
  margin-bottom: 3rem;
}

.category-card {
  background: white;
  padding: 2.5rem;
  border-radius: 20px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.category-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .category-card {
  background: var(--bg-secondary);
}

.category-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
}

.category-card.space::before {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.category-card.earth::before {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.category-card.climate::before {
  background: linear-gradient(135deg, #10b981, #059669);
}

.category-card.sustainability::before {
  background: linear-gradient(135deg, #84cc16, #65a30d);
}

.category-card.life::before {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.category-card.tech::before {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.category-icon {
  width: 70px;
  height: 70px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.category-card.space .category-icon {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.category-card.earth .category-icon {
  background: linear-gradient(135deg, #06b6d4, #0891b2);
}

.category-card.climate .category-icon {
  background: linear-gradient(135deg, #10b981, #059669);
}

.category-card.sustainability .category-icon {
  background: linear-gradient(135deg, #84cc16, #65a30d);
}

.category-card.life .category-icon {
  background: linear-gradient(135deg, #f59e0b, #d97706);
}

.category-card.tech .category-icon {
  background: linear-gradient(135deg, #ef4444, #dc2626);
}

.category-icon i {
  font-size: 1.8rem;
  color: white;
}

.category-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 1rem;
}

.category-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.category-examples {
  list-style: none;
  margin-bottom: 1.5rem;
}

.category-examples li {
  padding: 0.5rem 0;
  color: var(--text-secondary);
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9rem;
}

.category-examples li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

.category-badge {
  display: inline-block;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.preparation-section {
  margin-bottom: 5rem;
}

.prep-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-color);
  text-align: center;
  margin-bottom: 3rem;
}

.prep-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.prep-card {
  background: white;
  padding: 2rem;
  border-radius: 20px;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  text-align: center;
}

.prep-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .prep-card {
  background: var(--bg-secondary);
}

.prep-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
}

.prep-icon i {
  font-size: 1.5rem;
  color: white;
}

.prep-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 1rem;
}

.prep-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

.prep-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.prep-link:hover {
  gap: 0.75rem;
}

.past-challenges {
  margin-bottom: 5rem;
}

.past-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-color);
  text-align: center;
  margin-bottom: 1rem;
}

.past-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 3rem;
}

.past-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.past-card {
  background: white;
  padding: 2rem;
  border-radius: 16px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
  border-left: 4px solid var(--primary-color);
}

.past-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] .past-card {
  background: var(--bg-secondary);
}

.past-year {
  display: inline-block;
  background: var(--primary-color);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.past-card h4 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-color);
  margin-bottom: 0.75rem;
}

.past-card p {
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.95rem;
}

.challenges-cta {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  border-radius: 25px;
  padding: 4rem 3rem;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  align-items: center;
  color: white;
  position: relative;
  overflow: hidden;
}

.cta-content h3 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
}

.cta-content p {
  font-size: 1.2rem;
  opacity: 0.95;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.cta-primary,
.cta-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2rem;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 700;
  font-size: 1rem;
  transition: all 0.3s ease;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cta-primary {
  background: white;
  color: var(--primary-color);
}

.cta-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 25px rgba(255, 255, 255, 0.3);
}

.cta-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.cta-secondary:hover {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

.floating-challenges {
  position: relative;
  height: 200px;
}

.float-challenge {
  position: absolute;
  font-size: 2rem;
  animation: floatChallenge 4s ease-in-out infinite;
}

.float-challenge:nth-child(1) {
  top: 10%;
  left: 20%;
  animation-delay: 0s;
}

.float-challenge:nth-child(2) {
  top: 60%;
  left: 70%;
  animation-delay: 0.8s;
}

.float-challenge:nth-child(3) {
  top: 30%;
  left: 60%;
  animation-delay: 1.6s;
}

.float-challenge:nth-child(4) {
  top: 80%;
  left: 30%;
  animation-delay: 2.4s;
}

.float-challenge:nth-child(5) {
  top: 50%;
  left: 10%;
  animation-delay: 3.2s;
}

@keyframes floatChallenge {
  0%,
  100% {
    transform: translateY(0px) rotate(0deg);
  }
  25% {
    transform: translateY(-10px) rotate(5deg);
  }
  50% {
    transform: translateY(-20px) rotate(0deg);
  }
  75% {
    transform: translateY(-10px) rotate(-5deg);
  }
}

@media (max-width: 968px) {
  .coming-soon-alert {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1.5rem;
  }

  .challenges-cta {
    grid-template-columns: 1fr;
    text-align: center;
    padding: 3rem 2rem;
  }

  .categories-grid {
    grid-template-columns: 1fr;
  }

  .prep-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .challenges-page {
    padding: 3rem 0;
  }

  .challenges-container {
    padding: 0 1rem;
  }

  .challenges-header {
    margin-bottom: 3rem;
  }

  .coming-soon-alert {
    padding: 1.5rem;
  }

  .category-card {
    padding: 2rem;
  }

  .prep-card {
    padding: 1.5rem;
  }

  .challenges-cta {
    padding: 2rem 1.5rem;
  }

  .cta-content h3 {
    font-size: 1.5rem;
  }

  .cta-content p {
    font-size: 1rem;
  }

  .cta-buttons {
    justify-content: center;
  }

  .past-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .categories-grid {
    grid-template-columns: 1fr;
  }

  .past-grid {
    grid-template-columns: 1fr;
  }

  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
}