:root {
  --background-color: #ffffff;
  --default-color: #444444;
  --heading-color: #012970;
  --accent-color: #4154f1;
  --contrast-color: #ffffff;
  --surface-color: #f8fbff;
}

body {
  font-family: "Roboto", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--default-color);
  background: var(--surface-color);
  line-height: 1.7;
}

body.article-page {
  background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}

.hero {
  min-height: 30vh;
  padding: 28px 0 48px;
  display: flex;
  align-items: center;
  background: linear-gradient(135deg, rgba(65, 84, 241, 0.95), rgba(13, 110, 253, 0.95)), url("../assets/img/hero-bg.png") top center/cover no-repeat;
  color: var(--contrast-color);
}

.top-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 48px;
}

.brand {
  color: var(--contrast-color);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.section-title h2 {
  font-size: 13px;
  letter-spacing: 1px;
  font-weight: 700;
  padding: 8px 20px;
  margin: 0 0 10px;
  background: rgba(255, 255, 255, 0.16);
  color: var(--contrast-color);
  display: inline-block;
  text-transform: uppercase;
  border-radius: 50px;
}

.section-title p {
  font-size: 2rem;
  font-weight: 700;
  color: var(--contrast-color);
  margin: 0;
}

.lead {
  font-size: 1.1rem;
  max-width: 720px;
  color: rgba(255,255,255,0.92);
}

.btn-primary,
.btn-outline-primary,
.btn-light {
  border-radius: 4px;
  padding: 10px 20px;
  font-weight: 600;
  transition: .3s ease;
}

.btn-primary {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: var(--contrast-color);
}

.btn-primary:hover,
.btn-outline-primary:hover,
.btn-light:hover {
  transform: translateY(-1px);
}

.btn-outline-primary {
  border-color: var(--accent-color);
  color: var(--accent-color);
  background: transparent;
}

.card {
  border: 0;
  border-radius: 16px;
  box-shadow: 0 0 30px rgba(1, 41, 112, 0.08);
  background: var(--background-color);
}

.card-body {
  padding: 1.5rem;
}

.card-title {
  color: var(--heading-color);
  font-weight: 700;
}

.list-unstyled a {
  color: var(--accent-color);
  text-decoration: none;
}

.list-unstyled a:hover {
  color: #2a3cf0;
}

.article-shell {
  background: var(--background-color);
  border-radius: 18px;
  box-shadow: 0 0 30px rgba(1, 41, 112, 0.08);
  padding: 2rem;
  margin-top: -2rem;
}

.article-shell h1,
.article-shell h2,
.article-shell h3 {
  color: var(--heading-color);
  margin-top: 1.5rem;
}

.article-shell p {
  margin-bottom: 1rem;
}

.page-header {
  background: linear-gradient(135deg, rgba(65, 84, 241, 0.95), rgba(13, 110, 253, 0.95));
  color: white;
  padding: 24px 0 48px;
}

.page-header .btn-light {
  color: var(--accent-color);
}

@media (max-width: 767px) {
  .hero {
    min-height: auto;
    padding-top: 24px;
  }

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

  .article-shell {
    padding: 1.25rem;
  }
}