:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --accent: #d946ef;
  --bg-soft: #fbfbfd;
}

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background-color: var(--bg-soft);
  color: #0f172a;
  line-height: 1.6;
}

.glass-effect {
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.premium-card {
  background: white;
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 1.5rem;
}

.premium-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.08);
  border-color: rgba(99, 102, 241, 0.2);
}

article {
  max-width: 900px;
  margin: 0 auto;
}

h1 {
  font-size: 3rem;
  font-weight: 800;
  color: #0f172a;
  margin-bottom: 2rem;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

h2 {
  font-size: 2.25rem;
  font-weight: 800;
  color: #1e293b;
  margin-top: 4rem;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #334155;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

p {
  margin-bottom: 1.5rem;
  font-size: 1.125rem;
  color: #475569;
  line-height: 1.8;
}

.toc-box {
  background: white;
  border: 1px solid #e2e8f0;
  border-radius: 1.5rem;
  padding: 2rem;
  margin: 3rem 0;
}

.toc-box h2 {
  font-size: 1.25rem;
  margin-top: 0;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid #f1f5f9;
  padding-bottom: 0.75rem;
}

.toc-box ul {
  list-style: none;
  padding: 0;
}

.toc-box li {
  margin-bottom: 0.75rem;
}

.toc-box a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  font-size: 0.95rem;
}

.toc-box a:hover {
  text-decoration: underline;
}

.expert-perspective {
  background: #f8fafc;
  border-left: 4px solid var(--primary);
  padding: 2rem;
  margin: 3rem 0;
  border-radius: 0 1.5rem 1.5rem 0;
}

.expert-perspective blockquote {
  font-style: italic;
  font-size: 1.1rem;
  color: #334155;
  margin-bottom: 1rem;
}

.expert-perspective cite {
  font-style: normal;
  font-weight: 700;
  color: var(--primary);
  font-size: 0.9rem;
}

.faq-section {
  margin-top: 5rem;
  border-top: 1px solid #e2e8f0;
  padding-top: 3rem;
}

.faq-item {
  margin-bottom: 2.5rem;
}

.faq-item h4 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #1e293b;
  margin-bottom: 0.75rem;
}

.author-card {
  border-top: 1px solid #f1f5f9;
  margin-top: 4rem;
  padding-top: 3rem;
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.author-image {
  width: 64px;
  height: 64px;
  background: #f1f5f9;
  border-radius: 1rem;
}

.cta-box {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
  color: white;
  padding: 4rem 3rem;
  border-radius: 3rem;
  text-align: center;
  margin: 5rem 0;
  box-shadow: 0 40px 80px -20px rgba(0, 0, 0, 0.2);
}