.hero {
  position: relative;
  min-height: auto;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  padding-bottom: 2rem;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 70% 40%, var(--color-primary-light) 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 20% 80%, var(--color-accent-light) 0%, transparent 50%);
  opacity: 0.6;
}

.hero-content {
  position: relative;
  padding: 2rem 0;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.hero-highlight {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 40rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.hero-actions .btn {
  width: 100%;
  min-height: 48px;
}

.section {
  padding: 2.5rem 0;
}

.section-label {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 1.1rem + 2vw, 2.25rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 2.5rem;
  max-width: 30rem;
}

.about {
  background: var(--color-bg);
}

.about-grid {
  display: grid;
  gap: 2.5rem;
}

.about-text p {
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  max-width: 40rem;
}

.about-text strong {
  color: var(--color-text-primary);
}

.about-status {
  display: grid;
  gap: 0.75rem;
}

.status-card {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  min-height: 44px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.status-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.status-text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.pitfalls {
  background: var(--color-surface);
}

.pitfalls-list {
  display: grid;
  gap: 1.25rem;
}

.pitfall-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.pitfall-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.pitfall-severity {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.1875rem 0.625rem;
  border-radius: var(--radius-full);
  margin-bottom: 0.75rem;
}

.severity-high {
  background: var(--color-danger-light);
  color: var(--color-error);
}

.severity-mid {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.severity-low {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.pitfall-card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.pitfall-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.pitfall-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.pitfall-domain {
  background: var(--color-surface);
  padding: 0.1875rem 0.625rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  font-weight: 500;
}

.insights {
  background: var(--color-bg);
}

.insights-grid {
  display: grid;
  gap: 1.25rem;
}

.insight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.insight-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.insight-card h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.insight-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.progress {
  background: var(--color-surface);
}

.progress-list {
  display: grid;
  gap: 1.5rem;
}

.progress-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: transform var(--transition), box-shadow var(--transition);
}

.progress-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
  gap: 1rem;
}

.progress-header h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
}

.project-status {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.625rem;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.status-active {
  background: var(--color-success-light);
  color: var(--color-success);
}

.status-dev {
  background: var(--color-warning-light);
  color: var(--color-warning);
}

.status-research {
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.progress-card p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1rem;
}

.progress-bar-container {
  width: 100%;
  height: 8px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-full);
  transition: width 0.8s ease-out;
}

.progress-label {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.contact {
  background: var(--color-bg);
  text-align: center;
}

.contact-desc {
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  max-width: 30rem;
  margin-inline: auto;
}

.contact-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  max-width: 32rem;
  margin-inline: auto;
}

.contact-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-height: 44px;
  transition: transform var(--transition), box-shadow var(--transition);
  color: var(--color-text-primary);
}

.contact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  color: var(--color-primary);
}

.contact-icon {
  font-size: 1.75rem;
  color: var(--color-primary);
}

.contact-label {
  font-weight: 600;
  font-size: 0.9375rem;
}

.contact-value {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.wechat-cta {
  background: var(--color-surface);
}

.wechat-cta-content {
  text-align: center;
  max-width: 32rem;
}

.wechat-cta h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.wechat-desc {
  color: var(--color-text-secondary);
  margin-bottom: 1.5rem;
}

.wechat-card {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: 1rem;
}

.wechat-qr {
  display: block;
  margin: 0 auto 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  width: 120px;
  height: 120px;
}

.wechat-hint {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.wechat-contact-list {
  margin-top: 2rem;
  display: grid;
  gap: 0.75rem;
  max-width: 28rem;
  margin-inline: auto;
  text-align: start;
}

@media (min-width: 48rem) {
  .hero {
    min-height: 100vh;
    padding-top: 4rem;
    padding-bottom: 0;
  }

  .hero-content {
    padding: 4rem 0;
  }

  .hero h1 {
    font-size: clamp(2rem, 1.4rem + 3vw, 3.5rem);
  }

  .hero-sub {
    font-size: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
    line-height: 1.8;
  }

  .hero-actions {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .hero-actions .btn {
    width: auto;
  }

  .section {
    padding: clamp(3rem, 8vw, 6rem) 0;
  }

  .about-grid {
    grid-template-columns: 1fr auto;
    gap: 4rem;
    align-items: start;
  }

  .about-status {
    min-width: 240px;
  }

  .status-card {
    padding: 0.875rem 1.25rem;
  }

  .pitfalls-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .pitfall-card {
    padding: 1.75rem;
  }

  .pitfall-meta {
    flex-wrap: nowrap;
    gap: 1rem;
  }

  .insights-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .insight-card {
    padding: 1.75rem;
  }

  .progress-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .progress-card {
    padding: 1.75rem;
  }

  .wechat-card {
    flex-direction: row;
    padding: 1.25rem 2rem;
  }
}

@media (min-width: 64rem) {
  .hero h1 {
    max-width: 36rem;
  }
}