.article-shell {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #dbe4ee;
  --primary: #0f766e;
  --primary-dark: #115e59;
  --accent: #ecfeff;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
  --radius: 18px;
  --radius-sm: 12px;
  --max-width: 920px;
}

.article-shell {
  box-sizing: border-box;
}

.article-shell {
  scroll-behavior: smooth;
}

.article-shell  {
  margin: 0;
  font-family: Inter, Arial, Helvetica, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: linear-gradient(180deg, #f8fafc 0%, var(--bg) 100%);
}

.article-shell  img {
  max-width: 100%;
  height: auto;
}

.article-shell  a {
  color: var(--primary);
  text-decoration: none;
}

.article-shell  a:hover {
  text-decoration: underline;
}

.article-shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 32px auto 64px;
}

.article-shell .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 0.95rem;
  color: var(--muted);
}

.article-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero-article {
  padding: 48px 48px 32px;
  background: linear-gradient(135deg, #ecfeff 0%, #ffffff 60%);
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  display: inline-block;
  margin: 0 0 12px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(15, 118, 110, 0.12);
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 0.9rem;
}

.article-shell h1, .article-shell h2, .article-shell h3 {
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.article-shell h1 {
  margin: 0 0 16px;
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.article-shell h2 {
  margin: 0 0 16px;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.article-shell h3 {
  margin: 28px 0 10px;
  font-size: 1.2rem;
}

.article-shell  .intro {
  margin: 0;
  font-size: 1.1rem;
  color: #334155;
}

.article-shell.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.article-shell .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.article-shell .btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.article-shell .btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 22px rgba(15, 118, 110, 0.2);
}

.article-shell .btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  background: #fff;
  color: var(--primary-dark);
  border: 1px solid var(--border);
}

.summary-box,
.article-card section {
  padding: 32px 48px;
}

.article-card section + section {
  border-top: 1px solid var(--border);
}

.summary-box {
  background: #fbfdff;
}

.summary-box h2 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.summary-box ol {
  margin: 0;
  padding-left: 20px;
}

.summary-box li + li {
  margin-top: 10px;
}

.key-takeaway,
.note-box,
.conversion-box {
  margin-top: 22px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  background: var(--accent);
  border: 1px solid rgba(15, 118, 110, 0.15);
}

.article-shell ul {
  margin: 16px 0 0;
  padding-left: 22px;
}

.article-shell li + li {
  margin-top: 8px;
}

.article-shell .faq-item + .faq-item {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px dashed var(--border);
}

.conversion-box h2,
.conversion-box p {
  margin-top: 0;
}