:root {
  --zi-accent: #2980b9;
  --zi-accent-rgb: 41, 128, 185;
  --zi-accent-hover: #216ba1;
  --bs-link-color: var(--zi-accent);
  --bs-link-color-rgb: var(--zi-accent-rgb);
  --bs-link-hover-color: var(--zi-accent-hover);
  --bs-link-hover-color-rgb: 33, 107, 161;
  --bs-border-radius: 0.5rem;
  --bs-border-radius-lg: 0.75rem;
  --bs-body-font-family: Helvetica, Arial, sans-serif;
  --bs-body-line-height: 1.6;
}

[data-bs-theme=dark] {
  --zi-accent: #5488e8;
  --zi-accent-rgb: 84, 136, 232;
  --zi-accent-hover: #7aa3ee;
  --bs-link-hover-color-rgb: 122, 163, 238;
  --bs-body-bg: #1e2129;
}

body > .container {
  max-width: 62rem;
}

.btn-primary {
  --bs-btn-bg: #2980b9;
  --bs-btn-border-color: #2980b9;
  --bs-btn-hover-bg: #216ba1;
  --bs-btn-hover-border-color: #216ba1;
  --bs-btn-active-bg: #1c5a86;
  --bs-btn-active-border-color: #1c5a86;
  --bs-btn-disabled-bg: #2980b9;
  --bs-btn-disabled-border-color: #2980b9;
}

.btn-outline-primary {
  --bs-btn-color: var(--zi-accent);
  --bs-btn-border-color: var(--zi-accent);
  --bs-btn-hover-bg: rgba(var(--zi-accent-rgb), 0.12);
  --bs-btn-hover-color: var(--zi-accent);
  --bs-btn-hover-border-color: var(--zi-accent);
  --bs-btn-active-bg: rgba(var(--zi-accent-rgb), 0.2);
  --bs-btn-active-color: var(--zi-accent);
  --bs-btn-active-border-color: var(--zi-accent);
}

/* Tab navigation: underline style for top-level tabs */
.nav-underline {
  border-bottom: 1px solid var(--bs-border-color);
}

.nav-underline .nav-link {
  color: var(--bs-secondary-color);
}

.nav-underline .nav-link:hover {
  color: var(--bs-body-color);
}

.nav-underline .nav-link.active {
  border-bottom-color: var(--zi-accent);
}

/* Tab navigation: segmented-control style for nested tabs */
.nav-pills {
  --bs-nav-pills-link-active-bg: #ffffff;
  --bs-nav-pills-link-active-color: var(--bs-emphasis-color);
  width: fit-content;
  padding: 0.25rem;
  background: var(--bs-secondary-bg);
  border-radius: 0.75rem;
}

[data-bs-theme=dark] .nav-pills {
  --bs-nav-pills-link-active-bg: #495057;
}

.nav-pills .nav-link {
  color: var(--bs-secondary-color);
  padding: 0.25rem 0.75rem;
}

.nav-pills .nav-link.active {
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

.nav-pills .nav-link:hover:not(.active) {
  color: var(--bs-body-color);
}

/* Page header */
.site-header {
  padding: 1.25rem 0;
}

.site-brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--bs-emphasis-color);
}

.site-brand:hover {
  color: var(--bs-emphasis-color);
}

.site-nav .nav-link {
  color: var(--bs-secondary-color);
  font-weight: 500;
  padding: 0.25rem 0.75rem;
}

.site-nav .nav-link:hover {
  color: var(--bs-body-color);
}

.site-nav .nav-link.active {
  color: var(--zi-accent);
}

/* Hero (homepage) */
.hero {
  max-width: 46rem;
  margin: 0 auto;
  padding: 3.5rem 0 3rem;
  text-align: center;
}

.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 2.8rem);
  font-weight: 300;
  letter-spacing: normal;
  margin-bottom: 1rem;
}

/* Feature cards (homepage) */
.feature-card {
  --bs-card-border-color: var(--bs-border-color);
  --bs-card-border-radius: var(--bs-border-radius-lg);
  transition: border-color 0.15s ease-in-out;
}

.feature-card:hover {
  --bs-card-border-color: rgba(var(--zi-accent-rgb), 0.5);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.75rem;
  background: rgba(var(--zi-accent-rgb), 0.12);
  color: var(--zi-accent);
  margin-bottom: 0.75rem;
}

/* News lists */
.news-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.6rem 1.5rem;
  margin: 0;
}

.news-list dt {
  font-weight: 500;
  color: var(--bs-secondary-color);
  white-space: nowrap;
}

.news-list dd {
  margin: 0;
}

@media (max-width: 575px) {
  .news-list {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .news-list dd {
    margin-bottom: 0.75rem;
  }
}

/* Command snippets */
code .form-control-plaintext {
  font-family: var(--bs-font-monospace);
  font-size: 0.875em;
  background: var(--bs-tertiary-bg);
  border-radius: var(--bs-border-radius);
  padding: 0.5rem 0.75rem;
  resize: none;
}

/* Terminal panels */
.terminal {
  background: #11151a;
  border-radius: var(--bs-border-radius);
  padding: 0.625rem 1rem 0.75rem;
  margin-bottom: 1rem;
}

[data-bs-theme=dark] .terminal {
  border: 1px solid var(--bs-border-color);
}

.terminal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #848d97;
  margin-bottom: 0.375rem;
}

.terminal-copy {
  border: 0;
  background: none;
  color: #848d97;
  padding: 0 0.125rem;
}

.terminal-copy:hover {
  color: #e6edf3;
}

.terminal code .form-control-plaintext {
  background: transparent;
  border-radius: 0;
  padding: 0;
  color: #e6edf3;
}

/* Page footer */
.site-footer {
  margin-top: 3rem;
  padding: 1.5rem 0 2rem;
  border-top: 1px solid var(--bs-border-color);
  font-size: 0.875rem;
  color: var(--bs-secondary-color);
}