:root {
  --font-sans: "Inter", Arial, sans-serif;
  --color-text-primary: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #6b7280;
  --color-border-secondary: #d1d5db;
  --color-border-tertiary: #e5e7eb;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --color-background-primary: #ffffff;
  --color-background-secondary: #f9fafb;
}

body.dark-mode {
  --color-text-primary: #f9fafb;
  --color-text-secondary: #d1d5db;
  --color-text-tertiary: #9ca3af;
  --color-border-secondary: #4b5563;
  --color-border-tertiary: #374151;
  --color-background-primary: #111827;
  --color-background-secondary: #1f2937;
}

.hero {
  padding: 4rem 2rem 3rem;
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  font-size: 13px;
  padding: 6px 14px;
  border-radius: 20px;
  background: #E1F5EE;
  color: #0F6E56;
  margin-bottom: 1.5rem;
  font-weight: 600;
}

body.dark-mode .hero-tag {
  background: rgba(29, 158, 117, 0.2);
  color: #34d399;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 2rem;
}

.hero-btns {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-primary {
  background: #1D9E75;
  color: #fff !important;
  border: none;
  padding: 12px 24px;
  border-radius: var(--border-radius-md);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary:hover {
  background: #14805e;
  transform: translateY(-2px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text-primary) !important;
  border: 1px solid var(--color-border-secondary);
  padding: 12px 24px;
  border-radius: var(--border-radius-md);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-secondary:hover {
  background: var(--color-background-secondary);
  transform: translateY(-2px);
}

.section {
  padding: 3rem 2rem;
  max-width: 800px;
  margin: 0 auto;
  text-align: left;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-tertiary);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
}

.section-sub {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.6;
}

.divider {
  border: none;
  border-top: 1px solid var(--color-border-tertiary);
  margin: 0 auto;
  max-width: 800px;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.cat-card {
  background: var(--color-background-primary);
  border: 1px solid var(--color-border-tertiary);
  border-radius: var(--border-radius-lg);
  padding: 1.5rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}

.cat-card:hover {
  border-color: #1D9E75;
  transform: translateY(-4px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
}

body.dark-mode .cat-card:hover {
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

.cat-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 1rem;
}

.cat-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 6px;
}

.cat-card p {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0;
}

.cat-count {
  display: inline-block;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  margin-top: 14px;
  font-weight: 600;
}

.article-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.article-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--color-border-tertiary);
  cursor: pointer;
  transition: all 0.2s;
}

.article-item:hover {
  padding-left: 0.5rem;
  background: var(--color-background-secondary);
}

.article-item:last-child {
  border-bottom: none;
}

.article-meta {
  flex: 1;
  text-align: left;
}

.article-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  display: inline-block;
  margin-bottom: 8px;
}

.article-meta h4 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.article-meta p {
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin-bottom: 0;
}

.article-arrow {
  color: var(--color-text-tertiary);
  font-size: 22px;
  padding-top: 4px;
  transition: transform 0.2s;
}

.article-item:hover .article-arrow {
  transform: translateX(4px);
  color: #1D9E75;
}

.start-bar {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: var(--color-background-secondary);
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--color-border-tertiary);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.disclaimer {
  max-width: 800px;
  margin: 3rem auto;
  padding: 1.5rem;
  background: var(--color-background-secondary);
  border-radius: var(--border-radius-lg);
  border-left: 4px solid #888780;
  text-align: left;
}

.disclaimer-title {
  display: flex;
  align-items: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.disclaimer p {
  font-size: 13px;
  color: var(--color-text-tertiary);
  line-height: 1.6;
  margin-bottom: 0;
}

.hero-illustration {
  width: 100%;
  max-width: 480px;
  height: auto;
  display: block;
  margin: 1rem auto;
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

body.dark-mode .hero-illustration {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .hero {
    padding: 2.5rem 1rem 2rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  .hero p {
    font-size: 1.05rem;
  }

  .section {
    padding: 2.5rem 1rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  .article-item {
    flex-direction: column;
    gap: 0.5rem;
  }

  .article-arrow {
    align-self: flex-end;
    margin-top: -1rem;
  }

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

  .start-bar {
    flex-direction: column;
    text-align: left;
    align-items: flex-start;
  }

  .start-bar>div:last-child {
    width: 100%;
    justify-content: flex-start;
  }
}