:root {
  --ab-bg: #f6f5ff;
  --ab-surface: #ffffff;
  --ab-primary: #5a3ee6;
  --ab-primary-dark: #33217d;
  --ab-accent: #00a9a5;
  --ab-text: #1d2340;
  --ab-muted: #5d6484;
  --ab-border: rgba(51, 33, 125, 0.12);
}

body {
  background: var(--ab-bg);
  color: var(--ab-text);
  font-family: "Noto Sans KR", sans-serif;
  line-height: 1.75;
}

.ab-nav {
  background: linear-gradient(135deg, var(--ab-primary-dark), var(--ab-primary));
}

.ab-nav .navbar-brand img {
  max-width: 280px;
}

.ab-nav .nav-link,
.ab-nav .navbar-brand {
  color: #fff;
}

.ab-nav .nav-link.active,
.ab-nav .nav-link:hover {
  color: #fff;
  opacity: 1;
}

.ab-nav .nav-link {
  opacity: 0.85;
}

.ab-nav .navbar-toggler {
  border-color: rgba(255,255,255,0.4);
}

.ab-nav .navbar-toggler-icon {
  filter: invert(1);
}

.ab-hero {
  background: linear-gradient(180deg, #ece8ff 0%, #f6f5ff 100%);
  padding: 4.5rem 0 3rem;
}

.ab-kicker {
  display: inline-block;
  margin-bottom: 1rem;
  padding: 0.45rem 0.8rem;
  border-radius: 999px;
  background: rgba(90, 62, 230, 0.12);
  color: var(--ab-primary-dark);
  font-weight: 700;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
}

#ab-hero-heading,
#hero-heading,
h1,h2,h3 {
  color: var(--ab-primary-dark);
}

#hero-heading {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 800;
}

#hero-lead {
  max-width: 820px;
  margin: 0.9rem auto 0;
  color: var(--ab-muted);
}

.ab-content {
  background: var(--ab-surface);
  border: 1px solid var(--ab-border);
  border-radius: 24px;
  padding: 2rem;
  margin: -1rem auto 3rem;
  box-shadow: 0 18px 40px rgba(44, 33, 97, 0.06);
}

.ab-meta {
  color: var(--ab-muted);
  font-size: 0.95rem;
}

.ab-callout {
  background: rgba(0, 169, 165, 0.08);
  border-left: 4px solid var(--ab-accent);
  padding: 1rem 1.1rem;
  border-radius: 14px;
  margin: 1.4rem 0 1.8rem;
}

.ab-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0 1.75rem;
  overflow: hidden;
  border-radius: 16px;
}

.ab-table th,
.ab-table td {
  border: 1px solid var(--ab-border);
  padding: 0.9rem 1rem;
  vertical-align: top;
}

.ab-table th {
  background: var(--ab-primary-dark);
  color: #fff;
}

.ab-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}

.ab-card {
  background: linear-gradient(180deg, #ffffff 0%, #f7f7ff 100%);
  border: 1px solid var(--ab-border);
  border-radius: 20px;
  padding: 1.4rem;
}

.ab-card a,
.ab-content a,
.ab-footer a {
  color: var(--ab-primary);
  text-decoration: none;
  font-weight: 700;
}

.ab-card a:hover,
.ab-content a:hover,
.ab-footer a:hover {
  text-decoration: underline;
}

.ab-faq details {
  border: 1px solid var(--ab-border);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  background: #fbfbff;
  margin-bottom: 0.9rem;
}

.ab-faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ab-primary-dark);
}

.ab-footer {
  padding: 0 0 3rem;
  color: var(--ab-muted);
}

.ab-footer-links {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1rem;
  padding: 0;
  margin: 0 0 1rem;
  flex-wrap: wrap;
}

@media (max-width: 767px) {
  .ab-hero {
    padding: 3.4rem 0 2.2rem;
  }

  .ab-content {
    padding: 1.3rem;
    border-radius: 18px;
  }

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

  .ab-table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}