/* geography.css - Styles for Geography content structure */

/* ===== SUBJECT HERO SECTION ===== */
.subject-hero {
  text-align: center;
  padding: 3rem 1rem;
  background: linear-gradient(135deg, #1a5f7a 0%, #2a9d8f 100%);
  color: white;
  border-radius: 12px;
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.subject-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #ff9a3c, #ff6b6b);
}

.hero-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: #ffd166;
}

.subject-hero h1 {
  font-size: 2.8rem;
  margin-bottom: 0.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  margin-bottom: 1.5rem;
  font-weight: 300;
}

.curriculum-badge {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  padding: 0.5rem 1.5rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* ===== SUBJECT NOTE BOX ===== */
.subject-note-box {
  background: #e8f4fc;
  border-left: 4px solid #1a5f7a;
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.note-icon {
  color: #1a5f7a;
  font-weight: bold;
  font-size: 1.2rem;
  min-width: 24px;
}

.subject-note-box p {
  margin: 0;
  color: #2c3e50;
  line-height: 1.6;
}

/* ===== SUBJECT OVERVIEW ===== */
.subject-overview {
  margin-bottom: 3rem;
  padding: 2rem;
  background: #f8f9fa;
  border-radius: 12px;
  border: 1px solid #e9ecef;
}

.subject-overview h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-icon {
  color: #2a9d8f;
  font-weight: bold;
}

.subject-overview p {
  color: #495057;
  line-height: 1.7;
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
}

.key-concepts {
  margin-top: 2rem;
}

.key-concepts h3 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.3rem;
}

.concepts-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.concept-tag {
  background: #2a9d8f;
  color: white;
  padding: 0.5rem 1.2rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.concept-tag:hover {
  background: #21867a;
  transform: translateY(-2px);
}

/* ===== LAYERS CONTAINER ===== */
.layers-container {
  margin-bottom: 3rem;
}

.layers-container h2 {
  color: #1a5f7a;
  margin-bottom: 1rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-intro {
  color: #6c757d;
  margin-bottom: 2rem;
  font-size: 1.1rem;
  line-height: 1.6;
}

.layer-card {
  background: white;
  border-radius: 12px;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.layer-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
}

.layer-header {
  background: linear-gradient(135deg, #386b80, #2a9d8f);
  color: white;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.layer-number {
  background: rgba(31, 152, 168, 0.808);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
}

.layer-header h3 {
  margin: 0;
  flex-grow: 1;
  font-size: 1.5rem;
}

.layer-altitude {
  background: rgba(19, 201, 247, 0.945);
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
}

.layer-content {
  padding: 1.5rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.layer-characteristics h4,
.layer-importance h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
  border-bottom: 2px solid #e9ecef;
  padding-bottom: 0.5rem;
}

.layer-characteristics ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.layer-characteristics li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
}

.layer-characteristics li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.layer-characteristics strong {
  color: #2c3e50;
}

.layer-importance {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #2a9d8f;
}

.layer-importance p {
  margin: 0;
  color: #495057;
  line-height: 1.6;
}

/* ===== COMPOSITION SECTION ===== */
.composition-section {
  margin-bottom: 3rem;
}

.composition-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.composition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.composition-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.composition-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.gas-percentage {
  font-size: 2.5rem;
  font-weight: bold;
  color: #2a9d8f;
  margin-bottom: 1rem;
}

.composition-card h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.4rem;
}

.composition-card p {
  color: #6c757d;
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.note-small {
  font-size: 0.85rem;
  color: #6c757d;
  font-style: italic;
  margin-top: 0.5rem;
  padding-top: 0.5rem;
  border-top: 1px dashed #dee2e6;
}

/* ===== IMPORTANCE SECTION ===== */
.importance-section {
  margin-bottom: 3rem;
}

.importance-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.importance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.importance-item {
  background: white;
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.importance-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.importance-icon {
  font-size: 2.5rem;
  margin-bottom: 1.2rem;
  color: #2a9d8f;
}

.importance-item h3 {
  color: #264653;
  margin-bottom: 0.8rem;
  font-size: 1.3rem;
}

.importance-item p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

/* ===== HUMAN IMPACT SECTION ===== */
.human-impact {
  margin-bottom: 3rem;
}

.human-impact h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.impact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.impact-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.impact-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.impact-card.negative {
  border-top: 4px solid #e76f51;
}

.impact-card h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.4rem;
}

.impact-source {
  color: #e76f51;
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #e9ecef;
}

.impact-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.impact-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  color: #495057;
  line-height: 1.5;
}

.impact-card li::before {
  content: "—";
  color: #e76f51;
  position: absolute;
  left: 0;
}

/* ===== TEACHING STRATEGIES ===== */
.teaching-strategies {
  margin-bottom: 3rem;
}

.teaching-strategies h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.strategy-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.strategy-card {
  background: white;
  border-radius: 12px;
  padding: 2rem 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.strategy-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #f4a261;
}

.strategy-icon {
  font-size: 2.5rem;
  margin-bottom: 1.2rem;
  color: #f4a261;
}

.strategy-card h4 {
  color: #264653;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
}

.strategy-card p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

/* ===== ASSESSMENT SECTION ===== */
.assessment-section {
  margin-bottom: 3rem;
}

.assessment-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.assessment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
}

.assessment-item {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.assessment-item:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
  border-color: #e9c46a;
}

.assessment-item h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.assessment-item p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

/* ===== CAPS REQUIREMENTS ===== */
.caps-requirements {
  margin-bottom: 3rem;
  padding: 2rem;
  background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
  border-radius: 12px;
  border: 1px solid #dee2e6;
}

.caps-requirements h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.requirements-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.requirement {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: white;
  border-radius: 8px;
  border-left: 4px solid #2a9d8f;
}

.checkmark {
  color: #2a9d8f;
  font-weight: bold;
  font-size: 1.2rem;
  min-width: 24px;
}

.requirement p {
  margin: 0;
  color: #495057;
  line-height: 1.5;
  flex: 1;
}

/* ===== DOWNLOAD RESOURCES ===== */
.download-resources {
  margin-bottom: 3rem;
}

.download-resources h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.resource-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 2px solid transparent;
  transition: all 0.3s ease;
  display: block;
}

.resource-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: #1a5f7a;
  text-decoration: none;
}

.resource-icon {
  font-size: 2.5rem;
  margin-bottom: 1.2rem;
  color: #1a5f7a;
}

.resource-card h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.resource-card p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

/* ===== SUBJECT NAVIGATION ===== */
.subject-navigation {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid #e9ecef;
}

.nav-button {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem;
  background: white;
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  flex: 1;
  max-width: 48%;
}

.nav-button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
  text-decoration: none;
}

.nav-button.prev {
  text-align: left;
}

.nav-button.next {
  text-align: right;
  justify-content: space-between;
}

.nav-arrow {
  color: #2a9d8f;
  font-size: 1.5rem;
  font-weight: bold;
  min-width: 24px;
}

.nav-content {
  flex: 1;
}

.nav-subject {
  font-size: 0.9rem;
  color: #6c757d;
  margin-bottom: 0.25rem;
  font-weight: 500;
}

.nav-topic {
  font-size: 1.1rem;
  color: #305a5a;
  font-weight: 600;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .subject-hero {
    padding: 2rem 1rem;
  }
  
  .subject-hero h1 {
    font-size: 2.2rem;
  }
  
  .layer-content {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .layer-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
  
  .layer-altitude {
    align-self: flex-start;
  }
  
  .composition-grid,
  .importance-grid,
  .strategy-grid,
  .assessment-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }
  
  .impact-cards {
    grid-template-columns: 1fr;
  }
  
  .subject-navigation {
    flex-direction: column;
  }
  
  .nav-button {
    max-width: 100%;
  }
  
  .concepts-grid {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .subject-hero h1 {
    font-size: 1.8rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .subject-overview,
  .layer-content,
  .composition-card,
  .importance-item,
  .impact-card,
  .strategy-card,
  .assessment-item,
  .resource-card {
    padding: 1.25rem;
  }
  
  .layer-header {
    padding: 1.25rem;
  }
  
  .concept-tag {
    font-size: 0.8rem;
    padding: 0.4rem 0.9rem;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .subject-hero {
    background: white !important;
    color: black !important;
    border: 2px solid #1a5f7a;
  }
  
  .subject-note-box,
  .layer-card,
  .composition-card,
  .importance-item,
  .impact-card,
  .strategy-card,
  .assessment-item,
  .resource-card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
  
  .nav-button,
  .download-resources {
    display: none;
  }
  
  .layer-content {
    grid-template-columns: 1fr;
  }
}

/* Climate Zones Specific Styles */

/* ===== CLIMATE BASICS SECTION ===== */
.climate-basics {
  margin-bottom: 3rem;
}

.climate-basics h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.comparison-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.comparison-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.comparison-card h3 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.comparison-badge {
  display: inline-block;
  background: #2a9d8f;
  color: white;
  padding: 0.3rem 1rem;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-left: auto;
}

.comparison-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.comparison-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
}

.comparison-card li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.climate-elements {
  margin-top: 2rem;
}

.climate-elements h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.elements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.element-item {
  background: white;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  font-weight: 500;
  color: #1a5f7a;
  transition: all 0.3s ease;
}

.element-item:hover {
  background: #2a9d8f;
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* ===== FACTORS SECTION ===== */
.factors-section {
  margin-bottom: 3rem;
}

.factors-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.factors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.factor-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.factor-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.factor-icon {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-bottom: 1rem;
}

.factor-card h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.factor-card > p {
  color: #6c757d;
  margin-bottom: 1rem;
  line-height: 1.5;
  font-size: 0.95rem;
}

.factor-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.9rem;
}

.factor-card li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  line-height: 1.4;
  color: #495057;
}

.factor-card li::before {
  content: "—";
  color: #2a9d8f;
  position: absolute;
  left: 0;
}

/* ===== CLASSIFICATION SECTION ===== */
.classification-section {
  margin-bottom: 3rem;
}

.classification-section h2 {
  color: #1a5f7a;
  margin-bottom: 1rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.classification-intro {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  border-left: 4px solid #2a9d8f;
}

.classification-intro p {
  margin: 0;
  color: #495057;
  line-height: 1.6;
}

.classification-table {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.table-header {
  display: grid;
  grid-template-columns: 80px 120px 1fr 2fr;
  background: #264653;
  color: white;
  font-weight: 600;
  padding: 1rem 1.5rem;
}

.table-row {
  display: grid;
  grid-template-columns: 80px 120px 1fr 2fr;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid #e9ecef;
  transition: background-color 0.3s ease;
}

.table-row:hover {
  background-color: #f8f9fa;
}

.table-row:last-child {
  border-bottom: none;
}

.table-col {
  padding: 0.5rem 0;
}

.table-row:nth-child(even) {
  background-color: #f8f9fa;
}

.table-row:hover {
  background-color: #e9ecef;
}

/* ===== ZONES SECTION ===== */
.zones-section {
  margin-bottom: 3rem;
}

.zones-section h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.zone-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid #e9ecef;
  padding-bottom: 0.5rem;
}

.zone-tab {
  background: #f8f9fa;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-weight: 500;
  color: #6c757d;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  border-bottom: none;
}

.zone-tab:hover {
  background: #e9ecef;
  color: #264653;
}

.zone-tab.active {
  background: white;
  color: #1a5f7a;
  border-color: #e9ecef;
  border-bottom-color: white;
  position: relative;
  bottom: -1px;
}

.zone-content {
  display: none;
  background: white;
  border-radius: 0 12px 12px 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.zone-content.active {
  display: block;
}

.zone-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
}

.zone-header h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
}

.zone-location {
  color: #6c757d;
  font-size: 0.95rem;
  font-style: italic;
}

.zone-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.climate-type {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #2a9d8f;
}

.climate-type h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.climate-type ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.climate-type li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
}

.climate-type li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.climate-type strong {
  color: #2c3e50;
}

/* ===== SKILLS SECTION ===== */
.skills-section {
  margin-bottom: 3rem;
}

.skills-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.skill-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.skill-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #f4a261;
}

.skill-icon {
  width: 50px;
  height: 50px;
  background: #f4a261;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
  font-size: 0.9rem;
}

.skill-card h4 {
  color: #264653;
  margin-bottom: 0.8rem;
  font-size: 1.2rem;
}

.skill-card p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 768px) {
  .comparison-grid {
    grid-template-columns: 1fr;
  }
  
  .factors-grid {
    grid-template-columns: 1fr;
  }
  
  .zone-types {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .classification-table {
    font-size: 0.9rem;
  }
  
  .table-header,
  .table-row {
    grid-template-columns: 60px 100px 1fr 1fr;
    padding: 0.75rem 1rem;
  }
  
  .zone-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 0;
  }
  
  .zone-tab {
    white-space: nowrap;
  }
}

@media (max-width: 480px) {
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .elements-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .table-header,
  .table-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  
  .zone-content {
    padding: 1.25rem;
  }
}

/* Weather Systems Specific Styles */

/* ===== METEOROLOGY BASICS ===== */
.meteorology-basics {
  margin-bottom: 3rem;
}

.meteorology-basics h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.meteorology-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.meteo-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.meteo-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.meteo-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e9ecef;
}

.meteo-header h3 {
  color: #264653;
  margin: 0;
  font-size: 1.3rem;
}

.pressure-badge,
.temp-badge,
.humidity-badge,
.wind-badge {
  background: #2a9d8f;
  color: white;
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}

.meteo-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.meteo-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.meteo-card li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.meteo-card strong {
  color: #2c3e50;
}

/* ===== WEATHER INSTRUMENTS ===== */
.weather-instruments {
  margin-bottom: 3rem;
}

.weather-instruments h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.instruments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.instrument-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.instrument-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.instrument-icon {
  width: 60px;
  height: 60px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
  font-size: 1rem;
}

.instrument-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.instrument-card p {
  color: #6c757d;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.instrument-type {
  background: #f8f9fa;
  color: #495057;
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 500;
  display: inline-block;
}

.weather-maps {
  background: #f8f9fa;
  border-radius: 12px;
  padding: 2rem;
  border-left: 4px solid #2a9d8f;
}

.weather-maps h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
}

.map-elements {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.map-element {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.map-element h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.map-element p {
  color: #6c757d;
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  line-height: 1.5;
}

.map-tip {
  background: #fff3cd;
  color: #856404;
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  border-left: 3px solid #ffc107;
}

/* ===== PRESSURE SYSTEMS ===== */
.pressure-systems {
  margin-bottom: 3rem;
}

.pressure-systems h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.pressure-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.pressure-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.high-pressure {
  border-top: 4px solid #4caf50;
}

.low-pressure {
  border-top: 4px solid #f44336;
}

.pressure-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
}

.pressure-header h3 {
  color: #264653;
  margin: 0;
  font-size: 1.4rem;
}

.pressure-symbol {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
}

.pressure-characteristics h4,
.pressure-impact h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.pressure-characteristics ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem 0;
}

.pressure-characteristics li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
}

.pressure-characteristics li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.pressure-characteristics strong {
  color: #2c3e50;
}

.pressure-impact p {
  color: #495057;
  line-height: 1.6;
  margin: 0;
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 6px;
  border-left: 3px solid #2a9d8f;
}

/* ===== CYCLONE SYSTEMS ===== */
.cyclone-systems {
  margin-bottom: 3rem;
}

.cyclone-systems h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.cyclone-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid #e9ecef;
  padding-bottom: 0.5rem;
}

.cyclone-tab {
  background: #f8f9fa;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-weight: 500;
  color: #6c757d;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  border-bottom: none;
}

.cyclone-tab:hover {
  background: #e9ecef;
  color: #264653;
}

.cyclone-tab.active {
  background: white;
  color: #1a5f7a;
  border-color: #e9ecef;
  border-bottom-color: white;
  position: relative;
  bottom: -1px;
}

.cyclone-content {
  display: none;
  background: white;
  border-radius: 0 12px 12px 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.cyclone-content.active {
  display: block;
}

.cyclone-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
}

.cyclone-header h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
}

.cyclone-location {
  color: #6c757d;
  font-size: 0.95rem;
  font-style: italic;
}

.cyclone-details {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.detail-section h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.detail-section ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.detail-section li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
}

.detail-section li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

/* Fronts Grid */
.fronts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.front-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.cold-front {
  border-left: 4px solid #2196f3;
}

.warm-front {
  border-left: 4px solid #ff9800;
}

.occluded-front {
  border-left: 4px solid #9c27b0;
}

.stationary-front {
  border-left: 4px solid #795548;
}

.front-card h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.front-card p {
  color: #6c757d;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.front-weather {
  background: #f8f9fa;
  color: #495057;
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-top: 0.5rem;
  border-left: 3px solid #2a9d8f;
}

/* Lifecycle Stages */
.lifecycle-stages {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1.5rem;
}

.stage {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.stage:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.stage-number {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
  margin: 0 auto 1rem;
}

.stage h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.stage p {
  color: #6c757d;
  font-size: 0.9rem;
  margin: 0;
}

/* Tropical Cyclone Structure */
.structure-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.structure-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.eye {
  border-top: 4px solid #4caf50;
}

.eyewall {
  border-top: 4px solid #f44336;
}

.rainbands {
  border-top: 4px solid #2196f3;
}

.structure-card h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.structure-card p {
  color: #6c757d;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.structure-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.structure-card li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  font-size: 0.9rem;
  color: #495057;
}

.structure-card li::before {
  content: "—";
  color: #2a9d8f;
  position: absolute;
  left: 0;
}

/* Impacts Grid */
.impacts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.impact-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.impact-card h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.impact-card p {
  color: #6c757d;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.impact-level {
  background: #ffebee;
  color: #c62828;
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  display: inline-block;
}

.safety-measures {
  background: #e8f5e9;
  padding: 1.5rem;
  border-radius: 8px;
  border-left: 4px solid #4caf50;
}

.safety-measures h5 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.safety-measures ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.safety-measures li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
  color: #495057;
}

.safety-measures li::before {
  content: "✓";
  color: #4caf50;
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* ===== LOCAL PHENOMENA ===== */
.local-phenomena {
  margin-bottom: 3rem;
}

.local-phenomena h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.phenomena-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.phenomenon-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.phenomenon-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #f4a261;
}

.phenomenon-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.phenomenon-cause {
  color: #6c757d;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-style: italic;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #e9ecef;
}

.phenomenon-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.phenomenon-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.phenomenon-card li::before {
  content: "•";
  color: #f4a261;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.phenomenon-card strong {
  color: #2c3e50;
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 768px) {
  .meteorology-grid {
    grid-template-columns: 1fr;
  }
  
  .pressure-comparison {
    grid-template-columns: 1fr;
  }
  
  .instruments-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .map-elements {
    grid-template-columns: 1fr;
  }
  
  .fronts-grid,
  .lifecycle-stages,
  .structure-grid,
  .impacts-grid,
  .phenomena-grid {
    grid-template-columns: 1fr;
  }
  
  .cyclone-tabs {
    flex-direction: column;
  }
  
  .cyclone-tab {
    border-radius: 6px;
    margin-bottom: 0.5rem;
    text-align: left;
  }
  
  .cyclone-content {
    border-radius: 12px;
  }
}

@media (max-width: 480px) {
  .instruments-grid {
    grid-template-columns: 1fr;
  }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  
  .meteo-card,
  .pressure-card,
  .cyclone-content,
  .phenomenon-card {
    padding: 1.25rem;
  }
}

/* Atmosphere Landing Page Specific Styles */

/* ===== ATMOSPHERE OVERVIEW ===== */
.atmosphere-overview {
  margin-bottom: 3rem;
}

.atmosphere-overview h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.atmosphere-overview > p {
  color: #495057;
  line-height: 1.6;
  margin-bottom: 2rem;
  font-size: 1.05rem;
}

.overview-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.overview-card {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.overview-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
  text-decoration: none;
}

.overview-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.overview-card h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.overview-card p {
  color: #6c757d;
  line-height: 1.5;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.overview-link {
  color: #2a9d8f;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.overview-link:hover {
  text-decoration: underline;
}

/* ===== DETAILED COMPOSITION ===== */
.detailed-composition {
  margin-bottom: 3rem;
}

.detailed-composition h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.composition-breakdown {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.major-gases, .variable-gases {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.major-gases h3, .variable-gases h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
}

.gas-chart {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.gas-item {
  margin-bottom: 1.5rem;
}

.gas-name {
  color: #264653;
  font-weight: 600;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.gas-percent {
  background: #f8f9fa;
  padding: 0.3rem 0.8rem;
  border-radius: 4px;
  font-weight: 600;
  color: #2a9d8f;
}

.gas-bar {
  height: 8px;
  background: #e9ecef;
  border-radius: 4px;
  margin: 0.5rem 0;
  overflow: hidden;
}

.gas-fill {
  height: 100%;
  border-radius: 4px;
}

.nitrogen .gas-fill {
  background: linear-gradient(90deg, #4a90e2, #357abd);
}

.oxygen .gas-fill {
  background: linear-gradient(90deg, #50e3c2, #39b294);
}

.argon .gas-fill {
  background: linear-gradient(90deg, #b8e986, #8fc86d);
}

.gas-info {
  color: #6c757d;
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

.trace-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.trace-item {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1rem;
  border-left: 4px solid #2a9d8f;
}

.trace-name {
  color: #264653;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.trace-range {
  color: #2a9d8f;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
}

.trace-desc {
  color: #6c757d;
  font-size: 0.9rem;
  line-height: 1.4;
}

/* ===== ATMOSPHERE FUNCTIONS ===== */
.atmosphere-functions {
  margin-bottom: 3rem;
}

.atmosphere-functions h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.functions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.function-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.function-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.function-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.function-card h3 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.function-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.function-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.function-card li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

/* ===== HUMAN IMPACT DETAILED ===== */
.human-impact-detailed {
  margin-bottom: 3rem;
}

.human-impact-detailed h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.impact-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid #e9ecef;
  padding-bottom: 0.5rem;
}

.impact-tab {
  background: #f8f9fa;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-weight: 500;
  color: #6c757d;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  border-bottom: none;
}

.impact-tab:hover {
  background: #e9ecef;
  color: #264653;
}

.impact-tab.active {
  background: white;
  color: #1a5f7a;
  border-color: #e9ecef;
  border-bottom-color: white;
  position: relative;
  bottom: -1px;
}

.impact-content {
  display: none;
  background: white;
  border-radius: 0 12px 12px 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.impact-content.active {
  display: block;
}

.impact-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
}

.impact-header h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
}

.impact-source {
  color: #6c757d;
  font-size: 0.95rem;
  font-style: italic;
}

/* Air Pollution Content */
.pollutants-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.pollutant-card {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1.5rem;
  border-left: 4px solid #e76f51;
}

.pollutant-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.pollutant-size {
  color: #e76f51;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.pollutant-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pollutant-card li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  font-size: 0.9rem;
  color: #495057;
  line-height: 1.4;
}

.pollutant-card li::before {
  content: "—";
  color: #e76f51;
  position: absolute;
  left: 0;
}

.pollutant-card strong {
  color: #2c3e50;
}

/* Climate Change Content */
.climate-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.climate-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.climate-card h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.warming-potential {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.gas-warming {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.gas-warming span:first-child {
  width: 40px;
  font-weight: 600;
  color: #264653;
}

.gas-warming span:last-child {
  width: 40px;
  text-align: right;
  font-weight: 600;
  color: #e76f51;
}

.warming-bar {
  height: 8px;
  background: linear-gradient(90deg, #ff6b6b, #e76f51);
  border-radius: 4px;
  flex: 1;
}

.climate-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.climate-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  color: #495057;
  font-size: 0.95rem;
}

.climate-card li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

/* Ozone Depletion Content */
.ozone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.ozone-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  border-top: 4px solid #4caf50;
}

.ozone-card h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.ozone-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.ozone-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  color: #495057;
  font-size: 0.95rem;
}

.ozone-card li::before {
  content: "•";
  color: #4caf50;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.ozone-card strong {
  color: #2c3e50;
}

/* ===== ATMOSPHERE TEACHING ===== */
.atmosphere-teaching {
  margin-bottom: 3rem;
}

.atmosphere-teaching h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.teaching-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.strategy-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.strategy-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #f4a261;
}

.strategy-icon {
  width: 50px;
  height: 50px;
  background: #f4a261;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.strategy-card h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.strategy-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.strategy-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.strategy-card li::before {
  content: "•";
  color: #f4a261;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

/* ===== CAPS ATMOSPHERE ===== */
.caps-atmosphere {
  margin-bottom: 3rem;
}

.caps-atmosphere h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.requirements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.requirement-category {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  border-top: 4px solid #2a9d8f;
}

.requirement-category h3 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.requirement-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.requirement-category li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.requirement-category li::before {
  content: "✓";
  color: #2a9d8f;
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* ===== ATMOSPHERE RESOURCES ===== */
.atmosphere-resources {
  margin-bottom: 3rem;
}

.atmosphere-resources h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.resource-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.resource-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.resource-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
  text-decoration: none;
}

.resource-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.resource-content {
  flex: 1;
}

.resource-content h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.resource-content p {
  color: #6c757d;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

/* ===== ATMOSPHERE LINKS ===== */
.atmosphere-links {
  margin-bottom: 3rem;
}

.atmosphere-links h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
}

.topic-links {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.topic-link {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.topic-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
  text-decoration: none;
}

.topic-icon {
  width: 60px;
  height: 60px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1rem;
  flex-shrink: 0;
}

.topic-info {
  flex: 1;
}

.topic-info h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.3rem;
}

.topic-info p {
  color: #6c757d;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 768px) {
  .overview-cards {
    grid-template-columns: 1fr;
  }
  
  .functions-grid,
  .teaching-grid,
  .requirements-grid,
  .resource-cards {
    grid-template-columns: 1fr;
  }
  
  .pollutants-grid,
  .climate-grid,
  .ozone-grid {
    grid-template-columns: 1fr;
  }
  
  .impact-tabs {
    flex-direction: column;
  }
  
  .impact-tab {
    border-radius: 6px;
    margin-bottom: 0.5rem;
    text-align: left;
  }
  
  .impact-content {
    border-radius: 12px;
  }
  
  .topic-link {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .topic-icon {
    width: 50px;
    height: 50px;
  }
}

@media (max-width: 480px) {
  .gas-chart,
  .trace-grid {
    grid-template-columns: 1fr;
  }
  
  .resource-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .resource-icon {
    margin: 0 auto;
  }
}

/* Biomes & Ecosystems Specific Styles */

/* ===== BIOMES OVERVIEW ===== */
.biomes-overview {
  margin-bottom: 3rem;
}

.biomes-overview h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.biomes-intro {
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 2rem;
  border-left: 4px solid #2a9d8f;
}

.biomes-intro p {
  margin: 0;
  color: #495057;
  line-height: 1.6;
}

.biomes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.biome-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.biome-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.forest {
  border-top: 4px solid #4caf50;
}

.grassland {
  border-top: 4px solid #ff9800;
}

.desert {
  border-top: 4px solid #ffc107;
}

.aquatic {
  border-top: 4px solid #2196f3;
}

.biome-header {
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e9ecef;
}

.biome-header h3 {
  color: #264653;
  margin-bottom: 0.25rem;
  font-size: 1.4rem;
}

.biome-types {
  color: #6c757d;
  font-size: 0.9rem;
  font-style: italic;
}

.biome-characteristics h4,
.biome-locations h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.biome-characteristics ul {
  list-style: none;
  padding: 0;
  margin: 0 0 1rem 0;
}

.biome-characteristics li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.biome-characteristics li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.biome-characteristics strong {
  color: #2c3e50;
}

.biome-locations p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  padding: 0.5rem;
  background: #f8f9fa;
  border-radius: 4px;
  border-left: 3px solid #2a9d8f;
}

/* ===== ECOSYSTEMS SECTION ===== */
.ecosystems-section {
  margin-bottom: 3rem;
}

.ecosystems-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.ecosystem-components h3,
.energy-flow h3,
.ecological-relationships h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
}

.components-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.component-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.biotic {
  border-top: 4px solid #4caf50;
}

.abiotic {
  border-top: 4px solid #2196f3;
}

.component-card h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.component-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.component-item {
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 8px;
  border-left: 3px solid #2a9d8f;
}

.component-name {
  color: #264653;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.component-desc {
  color: #6c757d;
  font-size: 0.9rem;
  line-height: 1.4;
}

.energy-flow {
  margin-bottom: 2rem;
}

.flow-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 2rem;
  background: #f8f9fa;
  border-radius: 12px;
}

.flow-step {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  min-width: 150px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.step-number {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
}

.flow-step h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.flow-step p {
  color: #6c757d;
  font-size: 0.9rem;
  margin: 0;
}

.flow-arrow {
  color: #2a9d8f;
  font-size: 1.5rem;
  font-weight: bold;
}

.ecological-relationships {
  margin-bottom: 2rem;
}

.relationships-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.relationship-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.relationship-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.relationship-desc {
  color: #6c757d;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  line-height: 1.4;
}

.relationship-example {
  background: #e8f5e9;
  color: #2e7d32;
  padding: 0.5rem;
  border-radius: 4px;
  font-weight: 600;
  text-align: center;
  border-left: 3px solid #4caf50;
}

.symbiosis .relationship-types {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sym-type {
  padding: 0.5rem;
  background: #f8f9fa;
  border-radius: 4px;
  font-size: 0.9rem;
  color: #495057;
}

.sym-type strong {
  color: #264653;
}

/* ===== HUMAN IMPACT SECTION ===== */
.human-impact-section {
  margin-bottom: 3rem;
}

.human-impact-section h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.impact-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid #e9ecef;
  padding-bottom: 0.5rem;
}

.impact-tab {
  background: #f8f9fa;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-weight: 500;
  color: #6c757d;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  border-bottom: none;
}

.impact-tab:hover {
  background: #e9ecef;
  color: #264653;
}

.impact-tab.active {
  background: white;
  color: #1a5f7a;
  border-color: #e9ecef;
  border-bottom-color: white;
  position: relative;
  bottom: -1px;
}

.impact-content {
  display: none;
  background: white;
  border-radius: 0 12px 12px 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.impact-content.active {
  display: block;
}

.impact-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
}

.impact-header h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
}

.impact-subtitle {
  color: #6c757d;
  font-size: 0.95rem;
  font-style: italic;
}

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

.impact-causes h4,
.impact-effects h4,
.impact-solutions h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.impact-causes ul,
.impact-effects ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.impact-causes li,
.impact-effects li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
}

.impact-causes li::before,
.impact-effects li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.impact-causes strong,
.impact-effects strong {
  color: #2c3e50;
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.solution {
  background: white;
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.solution-icon {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 0.5rem;
  font-size: 0.8rem;
}

.solution h5 {
  color: #264653;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.solution p {
  color: #6c757d;
  font-size: 0.85rem;
  margin: 0;
}

/* Pollution Types */
.pollution-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.pollution-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  border-top: 4px solid #ff6b6b;
}

.pollution-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.pollution-sources {
  color: #e76f51;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  font-weight: 600;
}

.pollution-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.pollution-card li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  font-size: 0.9rem;
  color: #495057;
}

.pollution-card li::before {
  content: "—";
  color: #ff6b6b;
  position: absolute;
  left: 0;
}

/* Waste Management */
.waste-hierarchy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  padding: 1rem 0;
}

.waste-step {
  background: white;
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  min-width: 100px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.waste-number {
  width: 30px;
  height: 30px;
  background: #4caf50;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 0.5rem;
  font-size: 0.9rem;
}

.waste-step h5 {
  color: #264653;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

.waste-step p {
  color: #6c757d;
  font-size: 0.8rem;
  margin: 0;
}

.waste-arrow {
  color: #4caf50;
  font-weight: bold;
}

/* Climate Impacts */
.climate-impacts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.impact-area {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.impact-area h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.impact-area ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.impact-area li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  color: #495057;
  font-size: 0.95rem;
}

.impact-area li::before {
  content: "•";
  color: #ff9800;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

.mitigation-section {
  grid-column: 1 / -1;
}

.mitigation-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.mitigation {
  background: white;
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  border-top: 4px solid #4caf50;
}

.mitigation-icon {
  width: 40px;
  height: 40px;
  background: #4caf50;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 0.5rem;
  font-size: 0.8rem;
}

.mitigation h5 {
  color: #264653;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.mitigation p {
  color: #6c757d;
  font-size: 0.85rem;
  margin: 0;
}

/* ===== CONSERVATION SECTION ===== */
.conservation-section {
  margin-bottom: 3rem;
}

.conservation-section h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sustainability-principles h3,
.conservation-strategies h3,
.individual-actions h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.principle-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  text-align: center;
}

.principle-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
}

.principle-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.principle-card p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

.strategies-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.strategy-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.strategy-card h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.strategy-types {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.type-item {
  padding: 0.5rem;
  background: #f8f9fa;
  border-radius: 4px;
  font-size: 0.9rem;
  color: #495057;
}

.type-item strong {
  color: #264653;
}

.strategy-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.strategy-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.strategy-card li::before {
  content: "✓";
  color: #4caf50;
  position: absolute;
  left: 0;
  font-weight: bold;
}

.actions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.action-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.action-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.action-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
}

.action-card h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.action-card p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 768px) {
  .biomes-grid {
    grid-template-columns: 1fr;
  }
  
  .components-grid {
    grid-template-columns: 1fr;
  }
  
  .flow-diagram {
    flex-direction: column;
  }
  
  .flow-arrow {
    transform: rotate(90deg);
  }
  
  .relationships-grid {
    grid-template-columns: 1fr;
  }
  
  .impact-tabs {
    flex-direction: column;
  }
  
  .impact-tab {
    border-radius: 6px;
    margin-bottom: 0.5rem;
    text-align: left;
  }
  
  .impact-content {
    border-radius: 12px;
  }
  
  .impact-details {
    grid-template-columns: 1fr;
  }
  
  .pollution-types,
  .climate-impacts,
  .principles-grid,
  .strategies-grid,
  .actions-grid {
    grid-template-columns: 1fr;
  }
  
  .waste-hierarchy {
    flex-direction: column;
  }
  
  .waste-arrow {
    transform: rotate(90deg);
  }
}

@media (max-width: 480px) {
  .biome-card,
  .component-card,
  .relationship-card,
  .impact-content,
  .principle-card,
  .strategy-card,
  .action-card {
    padding: 1.25rem;
  }
  
  .flow-step {
    min-width: 120px;
    padding: 1rem;
  }
}

/* Major World Biomes Specific Styles */

/* ===== BIOME CONCEPTS ===== */
.biome-concepts {
  margin-bottom: 3rem;
}

.biome-concepts h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.concepts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.concept-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.concept-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
}

.concept-icon {
  width: 60px;
  height: 60px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
  font-size: 1rem;
}

.concept-card h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.concept-card p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
  font-size: 0.95rem;
}

.factors-section {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.factors-section h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
  text-align: center;
}

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

.factor-type {
  text-align: center;
}

.factor-type h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.1rem;
}

.factor-items {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.factor-item {
  background: #f8f9fa;
  color: #495057;
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s ease;
}

.factor-item:hover {
  background: #2a9d8f;
  color: white;
  transform: translateY(-2px);
}

/* ===== DETAILED BIOMES ===== */
.detailed-biomes {
  margin-bottom: 3rem;
}

.detailed-biomes h2 {
  color: #1a5f7a;
  margin-bottom: 1.5rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.biome-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 2px solid #e9ecef;
  padding-bottom: 0.5rem;
}

.biome-tab {
  background: #f8f9fa;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px 6px 0 0;
  cursor: pointer;
  font-weight: 500;
  color: #6c757d;
  transition: all 0.3s ease;
  border: 1px solid transparent;
  border-bottom: none;
}

.biome-tab:hover {
  background: #e9ecef;
  color: #264653;
}

.biome-tab.active {
  background: white;
  color: #1a5f7a;
  border-color: #e9ecef;
  border-bottom-color: white;
  position: relative;
  bottom: -1px;
}

.biome-content {
  display: none;
  background: white;
  border-radius: 0 12px 12px 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.biome-content.active {
  display: block;
}

.biome-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #e9ecef;
}

.biome-header h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.6rem;
}

.biome-subtitle {
  color: #6c757d;
  font-size: 0.95rem;
  font-style: italic;
}

.biome-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.detail-card {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1.5rem;
  border-left: 4px solid #2a9d8f;
}

.detail-card h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid #e9ecef;
}

.location-map {
  padding: 0.5rem;
}

.map-indicator {
  background: #2a9d8f;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-weight: 600;
  margin-bottom: 1rem;
  display: inline-block;
}

.location-map ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.location-map li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
  color: #495057;
}

.location-map li::before {
  content: "📍";
  position: absolute;
  left: 0;
}

.climate-data {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 1rem;
}

.climate-item {
  background: white;
  border-radius: 6px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.climate-label {
  color: #6c757d;
  font-size: 0.9rem;
  margin-bottom: 0.25rem;
}

.climate-value {
  color: #264653;
  font-weight: 600;
  font-size: 1rem;
}

.adaptation-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.adaptation {
  padding: 1rem;
  background: white;
  border-radius: 6px;
  border-left: 3px solid #4caf50;
}

.adaptation-name {
  color: #264653;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.adaptation-desc {
  color: #6c757d;
  font-size: 0.9rem;
  line-height: 1.4;
}

.adaptation-feature {
  background: #e8f5e9;
  color: #2e7d32;
  padding: 0.75rem;
  border-radius: 4px;
  font-weight: 600;
  margin-top: 1rem;
  border-left: 3px solid #4caf50;
}

.animal-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.animal-group {
  padding: 1rem;
  background: white;
  border-radius: 6px;
  border-left: 3px solid #2196f3;
}

.animal-group h5 {
  color: #264653;
  margin-bottom: 0.25rem;
  font-size: 1rem;
}

.animal-group p {
  color: #6c757d;
  font-size: 0.9rem;
  margin: 0;
}

.impact-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.impact-category {
  padding: 1rem;
  background: white;
  border-radius: 6px;
}

.impact-category.negative {
  border-left: 3px solid #f44336;
}

.impact-category h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.impact-category ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.impact-category li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  color: #495057;
  font-size: 0.9rem;
}

.impact-category li::before {
  content: "—";
  color: #f44336;
  position: absolute;
  left: 0;
}

.type-section,
.climate-comparison,
.vegetation-section,
.animal-comparison {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.grassland-type,
.climate-type {
  padding: 1rem;
  background: white;
  border-radius: 6px;
  border-left: 3px solid #ff9800;
}

.grassland-type h5,
.climate-type h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.grassland-type ul,
.climate-type ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.grassland-type li,
.climate-type li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  color: #495057;
  font-size: 0.9rem;
}

.grassland-type li::before,
.climate-type li::before {
  content: "•";
  color: #ff9800;
  position: absolute;
  left: 0;
}

.vegetation-feature {
  padding: 1rem;
  background: white;
  border-radius: 6px;
  border-left: 3px solid #4caf50;
}

.vegetation-feature h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.vegetation-feature p {
  color: #6c757d;
  font-size: 0.9rem;
  margin: 0;
}

.vegetation-feature ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.vegetation-feature li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  color: #495057;
  font-size: 0.9rem;
}

.vegetation-feature li::before {
  content: "✓";
  color: #4caf50;
  position: absolute;
  left: 0;
  font-weight: bold;
}

.animal-type {
  padding: 1rem;
  background: white;
  border-radius: 6px;
  border-left: 3px solid #2196f3;
}

.animal-type h5 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.animal-type ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.animal-type li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
  color: #495057;
  font-size: 0.9rem;
}

.animal-type li::before {
  content: "🐾";
  position: absolute;
  left: 0;
}

/* ===== LEARNING OBJECTIVES ===== */
.learning-objectives {
  margin-bottom: 3rem;
}

.learning-objectives h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.objectives-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.objective-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  border-top: 4px solid #2a9d8f;
}

.objective-number {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.objective-card h3 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.objective-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.objective-card li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.objective-card li::before {
  content: "✓";
  color: #2a9d8f;
  position: absolute;
  left: 0;
  font-weight: bold;
}

/* ===== ASSESSMENT GUIDELINES ===== */
.assessment-guidelines {
  margin-bottom: 3rem;
}

.assessment-guidelines h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.assessment-type {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.assessment-type h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
  text-align: center;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #e9ecef;
}

.assessment-methods {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

.method {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  transition: all 0.3s ease;
}

.method:hover {
  transform: translateY(-3px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  background: white;
}

.method-icon {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 0.5rem;
  font-size: 0.9rem;
}

.method h4 {
  color: #264653;
  margin-bottom: 0.25rem;
  font-size: 0.9rem;
}

.method p {
  color: #6c757d;
  font-size: 0.8rem;
  margin: 0;
  line-height: 1.4;
}

.assessment-criteria {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.assessment-criteria h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.3rem;
  text-align: center;
}

.criteria-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
}

.criterion {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.3s ease;
}

.criterion:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  background: white;
}

.criterion-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  margin: 0 auto 1rem;
  font-size: 0.9rem;
}

.criterion h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.criterion p {
  color: #6c757d;
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 0;
}

/* ===== FOOD WEBS & ECOLOGY ===== */
.food-webs {
  margin-bottom: 3rem;
}

.food-webs h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.energy-flow h3,
.interdependence h3 {
  color: #264653;
  margin-bottom: 1.5rem;
  font-size: 1.4rem;
}

.flow-pyramid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 2rem;
  background: #f8f9fa;
  border-radius: 12px;
  padding: 2rem;
}

.pyramid-level {
  padding: 1.5rem;
  border-radius: 8px;
  text-align: center;
  color: white;
  transition: all 0.3s ease;
}

.pyramid-level:hover {
  transform: scale(1.02);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.producers {
  background: linear-gradient(135deg, #4caf50, #2e7d32);
  width: 100%;
}

.primary {
  background: linear-gradient(135deg, #2196f3, #0d47a1);
  width: 70%;
  align-self: center;
}

.secondary {
  background: linear-gradient(135deg, #ff9800, #ef6c00);
  width: 40%;
  align-self: center;
}

.tertiary {
  background: linear-gradient(135deg, #f44336, #b71c1c);
  width: 20%;
  align-self: center;
}

.level-name {
  font-weight: bold;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.level-example {
  font-size: 0.9rem;
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

.level-energy {
  font-weight: 600;
  font-size: 1rem;
}

.relationship-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.relationship {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
}

.relationship h4 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.relationship p {
  color: #6c757d;
  line-height: 1.5;
  margin: 0;
}

.sym-types {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sym-type {
  padding: 0.75rem;
  background: #f8f9fa;
  border-radius: 6px;
  font-size: 0.9rem;
  color: #495057;
}

.sym-type strong {
  color: #264653;
}

/* ===== CAPS ALIGNMENT ===== */
.caps-alignment {
  margin-bottom: 3rem;
}

.caps-alignment h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alignment-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.alignment-area {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  border-top: 4px solid #2a9d8f;
}

.alignment-area h3 {
  color: #264653;
  margin-bottom: 1rem;
  font-size: 1.2rem;
}

.alignment-area ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.alignment-area li {
  margin-bottom: 0.8rem;
  padding-left: 1.5rem;
  position: relative;
  line-height: 1.5;
  color: #495057;
  font-size: 0.95rem;
}

.alignment-area li::before {
  content: "•";
  color: #2a9d8f;
  font-size: 1.5rem;
  position: absolute;
  left: 0;
  top: -3px;
}

/* ===== STUDY RESOURCES ===== */
.study-resources {
  margin-bottom: 3rem;
}

.study-resources h2 {
  color: #1a5f7a;
  margin-bottom: 2rem;
  font-size: 1.8rem;
}

.resource-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.resource-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.resource-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  border-color: #2a9d8f;
  text-decoration: none;
}

.resource-icon {
  width: 50px;
  height: 50px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 0.9rem;
  flex-shrink: 0;
}

.resource-content {
  flex: 1;
}

.resource-content h3 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.1rem;
}

.resource-content p {
  color: #6c757d;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

/* ===== RESPONSIVE ADJUSTMENTS ===== */
@media (max-width: 768px) {
  .concepts-grid {
    grid-template-columns: 1fr;
  }
  
  .biome-tabs {
    flex-direction: column;
  }
  
  .biome-tab {
    border-radius: 6px;
    margin-bottom: 0.5rem;
    text-align: left;
  }
  
  .biome-content {
    border-radius: 12px;
  }
  
  .biome-details {
    grid-template-columns: 1fr;
  }
  
  .objectives-grid {
    grid-template-columns: 1fr;
  }
  
  .assessment-types {
    grid-template-columns: 1fr;
  }
  
  .assessment-methods {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .criteria-grid {
    grid-template-columns: 1fr;
  }
  
  .relationship-types {
    grid-template-columns: 1fr;
  }
  
  .alignment-grid {
    grid-template-columns: 1fr;
  }
  
  .resource-cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .climate-data {
    grid-template-columns: 1fr;
  }
  
  .assessment-methods {
    grid-template-columns: 1fr;
  }
  
  .flow-pyramid {
    padding: 1rem;
  }
  
  .pyramid-level {
    padding: 1rem;
  }
}

/* ===== LANDING PAGE SPECIFIC STYLES ===== */
.study-sequence {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 2rem 0;
}

.sequence-step {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
  border: 1px solid #e9ecef;
  transition: all 0.3s ease;
}

.step-number {
  width: 40px;
  height: 40px;
  background: #2a9d8f;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
}

.step-content h4 {
  color: #264653;
  margin-bottom: 0.5rem;
  font-size: 1.2rem;
}

.step-content p {
  color: #6c757d;
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
}

.nav-intro {
  text-align: center;
  margin-bottom: 2rem;
}

.nav-intro h3 {
  color: #1a5f7a;
  margin-bottom: 0.5rem;
  font-size: 1.5rem;
}

.nav-intro p {
  color: #6c757d;
  margin: 0;
}

/* Responsive adjustments for landing page */
@media (max-width: 768px) {
  .sequence-step {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
  }
  
  .step-content {
    text-align: center;
  }
}