.b4-kicker,
.b4-v50-kicker,
.b4-v50-eyebrow {
  display: inline-block;
  color: var(--b4-color-accent);
  font-size: var(--b4-text-1);
  font-weight: 750;
  line-height: 1.25;
  text-transform: uppercase;
}

.b4-actions,
.b4-v50-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--b4-space-3);
}

.b4-button,
.b4-v50-btn,
.b4-nav-action,
.btn {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  gap: var(--b4-space-2);
  padding: 0.625rem 1rem;
  border: 1px solid transparent;
  border-radius: var(--b4-radius-2);
  font-size: var(--b4-text-3);
  font-weight: 750;
  line-height: 1.2;
  text-align: center;
  cursor: pointer;
  transition:
    background-color var(--b4-duration-base) var(--b4-ease),
    border-color var(--b4-duration-base) var(--b4-ease),
    color var(--b4-duration-base) var(--b4-ease),
    transform var(--b4-duration-base) var(--b4-ease);
}

.b4-button:hover,
.b4-v50-btn:hover,
.b4-nav-action:hover,
.btn:hover {
  transform: translateY(-1px);
}

.b4-button-primary,
.b4-v50-btn-primary,
.b4-nav-action.btn-primary,
.btn-primary {
  border-color: var(--b4-color-accent);
  background: var(--b4-color-accent);
  color: #092219;
}

.b4-button-primary:hover,
.b4-v50-btn-primary:hover,
.b4-nav-action.btn-primary:hover,
.btn-primary:hover {
  border-color: var(--b4-color-accent-hover);
  background: var(--b4-color-accent-hover);
}

.b4-button-secondary,
.b4-v50-btn-secondary,
.b4-nav-action.btn-secondary,
.btn-secondary {
  border-color: var(--b4-color-border-strong);
  background: rgba(255, 255, 255, 0.025);
  color: var(--b4-color-text);
}

.b4-button-secondary:hover,
.b4-v50-btn-secondary:hover,
.b4-nav-action.btn-secondary:hover,
.btn-secondary:hover {
  border-color: rgba(118, 224, 178, 0.55);
  background: rgba(118, 224, 178, 0.07);
}

.b4-nav-action.btn-quiet {
  padding-inline: var(--b4-space-2);
  border-color: transparent;
  background: transparent;
  color: var(--b4-color-text-subtle);
  font-weight: 650;
}

.b4-nav-action.btn-quiet:hover {
  color: var(--b4-color-text);
}

.b4-button-danger,
.b4-v50-btn.is-danger {
  border-color: var(--b4-color-negative);
  background: var(--b4-color-negative);
  color: #2b0d0d;
}

.b4-text-link,
.b4-v50-text-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: var(--b4-space-2);
  border-bottom: 1px solid var(--b4-color-border-strong);
  color: var(--b4-color-text);
  font-size: var(--b4-text-3);
  font-weight: 700;
  transition: color var(--b4-duration-base) var(--b4-ease), border-color var(--b4-duration-base) var(--b4-ease);
}

.b4-text-link:hover,
.b4-v50-text-link:hover {
  border-color: var(--b4-color-accent);
  color: var(--b4-color-accent);
}

.b4-section-heading,
.b4-v50-section-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(18rem, 0.65fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: end;
}

.b4-section-heading h2,
.b4-v50-section-intro h2 {
  max-width: 50rem;
  margin: var(--b4-space-3) 0 0;
  font-family: var(--b4-font-serif);
  font-size: var(--b4-text-8);
  font-weight: 400;
  line-height: var(--b4-leading-tight);
}

.b4-section-heading > p,
.b4-v50-section-intro > p {
  margin-bottom: 0;
  color: var(--b4-color-text-muted);
  font-size: var(--b4-text-4);
}

/* Header */
.site-header.b4-header-v50 {
  position: sticky;
  z-index: 1000;
  top: 0;
  min-height: var(--b4-header-height);
  border-bottom: 1px solid var(--b4-color-border);
  background: rgba(11, 13, 14, 0.94);
  backdrop-filter: blur(16px);
}

.b4-nav-v50 {
  display: grid;
  min-height: var(--b4-header-height);
  grid-template-columns: 11rem minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--b4-space-6);
}

.brand,
.b4-auth-brand,
.b4-product-brand {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: var(--b4-space-2);
  color: var(--b4-color-text);
  font-size: var(--b4-text-5);
  font-weight: 800;
  line-height: 1;
}

.b4-mark {
  width: 1.75rem;
  height: 1.75rem;
  flex: 0 0 auto;
}

.b4-mark-primary {
  fill: var(--b4-color-accent);
}

.b4-mark-path {
  fill: none;
  stroke: var(--b4-color-text-muted);
  stroke-width: 1.5;
}

.b4-mark-node {
  fill: var(--b4-color-info);
}

.primary-nav {
  justify-self: center;
}

.primary-nav .menu {
  display: flex;
  align-items: center;
  gap: var(--b4-space-2);
  padding: 0;
  margin: 0;
  list-style: none;
}

.primary-nav a {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding-inline: var(--b4-space-3);
  color: var(--b4-color-text-muted);
  font-size: var(--b4-text-2);
  font-weight: 650;
  transition: color var(--b4-duration-fast) ease;
}

.primary-nav a:hover,
.primary-nav a[aria-current="page"] {
  color: var(--b4-color-text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--b4-space-2);
}

.nav-actions .b4-nav-action.btn-secondary {
  padding-inline: var(--b4-space-3);
}

.menu-toggle,
.mobile-cta,
.b4-mobile-nav-actions {
  display: none;
}

/* Form controls */
.b4math-theme :where(label) {
  color: var(--b4-color-text-muted);
  font-size: var(--b4-text-2);
  font-weight: 650;
}

.b4math-theme :where(input:not([type="checkbox"]):not([type="radio"]):not([type="range"]), textarea, select) {
  width: 100%;
  min-height: 2.75rem;
  border: 1px solid var(--b4-color-border-strong);
  border-radius: var(--b4-radius-2);
  background: var(--b4-color-canvas);
  color: var(--b4-color-text);
  padding: 0.7rem 0.8rem;
  font-size: var(--b4-text-3);
  line-height: 1.5;
  outline: 0;
  transition: border-color var(--b4-duration-fast) ease, box-shadow var(--b4-duration-fast) ease;
}

.b4math-theme :where(textarea) {
  min-height: 7.5rem;
  resize: vertical;
}

.b4math-theme :where(input:not([type="checkbox"]):not([type="radio"]):not([type="range"]), textarea, select):focus {
  border-color: var(--b4-color-accent);
  box-shadow: 0 0 0 3px rgba(118, 224, 178, 0.12);
}

.b4math-theme :where(input[type="checkbox"], input[type="radio"], input[type="range"]) {
  accent-color: var(--b4-color-accent);
}

.b4-form-error,
.b4-form-success,
.b4m-app-notice,
.b4m-form-note {
  padding: var(--b4-space-3) var(--b4-space-4);
  border: 1px solid var(--b4-color-border-strong);
  border-radius: var(--b4-radius-2);
  background: var(--b4-color-surface);
  color: var(--b4-color-text-muted);
  font-size: var(--b4-text-2);
}

.b4-honeypot {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.b4-form-error {
  border-color: rgba(238, 133, 133, 0.5);
  color: #ffc7c7;
}

.b4-form-success,
.b4m-app-notice {
  border-color: rgba(118, 224, 178, 0.45);
  color: #c9f7e2;
}

/* Footer */
.site-footer.b4-footer-v50 {
  border-top: 1px solid var(--b4-color-border);
  background: #090b0c;
  color: var(--b4-color-text);
}

.b4-footer-lead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--b4-space-8);
  align-items: end;
  padding-block: var(--b4-space-16);
  border-bottom: 1px solid var(--b4-color-border);
}

.b4-footer-lead h2 {
  max-width: 42rem;
  margin: var(--b4-space-6) 0 var(--b4-space-3);
  font-family: var(--b4-font-serif);
  font-size: var(--b4-text-7);
  font-weight: 400;
  line-height: var(--b4-leading-snug);
}

.b4-footer-lead p {
  max-width: 42rem;
  margin-bottom: 0;
  color: var(--b4-color-text-muted);
}

.b4-footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) minmax(17rem, 1.2fr);
  gap: var(--b4-space-8);
  padding-block: var(--b4-space-12);
}

.b4-footer-grid > div {
  display: grid;
  align-content: start;
  gap: var(--b4-space-2);
}

.b4-footer-grid > div > span,
.b4-footer-status > span {
  margin-bottom: var(--b4-space-2);
  color: var(--b4-color-text-subtle);
  font-size: var(--b4-text-1);
  font-weight: 750;
  text-transform: uppercase;
}

.b4-footer-grid a,
.b4-footer-status p {
  margin: 0;
  color: var(--b4-color-text-muted);
  font-size: var(--b4-text-2);
}

.b4-footer-grid a {
  min-height: 2rem;
}

.b4-footer-grid a:hover {
  color: var(--b4-color-text);
}

.b4-footer-status p {
  display: flex;
  align-items: center;
  gap: var(--b4-space-2);
}

.b4-footer-status i,
.b4-product-state i {
  width: 0.45rem;
  height: 0.45rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--b4-color-positive);
}

.b4-footer-status i.optional {
  background: var(--b4-color-warning);
}

.b4-footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: var(--b4-space-4);
  padding-block: var(--b4-space-5);
  border-top: 1px solid var(--b4-color-border);
  color: var(--b4-color-text-subtle);
  font-size: var(--b4-text-1);
}

.b4-footer-custom-menu {
  padding-block: var(--b4-space-4);
  border-top: 1px solid var(--b4-color-border);
}

.b4-footer-custom-menu .menu {
  display: flex;
  flex-wrap: wrap;
  gap: var(--b4-space-4);
  padding: 0;
  margin: 0;
  list-style: none;
}

.b4-footer-custom-menu a {
  color: var(--b4-color-text-muted);
  font-size: var(--b4-text-1);
}

@media (max-width: 72rem) {
  .b4-nav-v50 {
    grid-template-columns: 9rem minmax(0, 1fr) auto;
    gap: var(--b4-space-3);
  }

  .primary-nav a {
    padding-inline: var(--b4-space-2);
  }

  .nav-actions .btn-secondary {
    display: none;
  }

  .b4-footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 56rem) {
  .b4-section-heading,
  .b4-v50-section-intro {
    grid-template-columns: 1fr;
    align-items: start;
    gap: var(--b4-space-5);
  }

  .b4-section-heading h2,
  .b4-v50-section-intro h2 {
    font-size: var(--b4-text-7);
  }

  .b4-nav-v50 {
    grid-template-columns: 1fr auto;
  }

  .menu-toggle {
    display: grid;
    width: 2.75rem;
    height: 2.75rem;
    grid-column: 2;
    grid-row: 1;
    place-content: center;
    gap: 0.3rem;
    border: 1px solid var(--b4-color-border-strong);
    border-radius: var(--b4-radius-2);
    background: var(--b4-color-surface);
    cursor: pointer;
  }

  .menu-toggle span {
    width: 1.1rem;
    height: 1px;
    background: var(--b4-color-text);
    transition: transform var(--b4-duration-base) var(--b4-ease), opacity var(--b4-duration-fast) ease;
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(0.375rem) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-0.375rem) rotate(-45deg);
  }

  .primary-nav {
    position: fixed;
    z-index: 999;
    inset: var(--b4-header-height) 0 auto;
    display: none;
    max-height: calc(100dvh - var(--b4-header-height));
    overflow-y: auto;
    border-bottom: 1px solid var(--b4-color-border-strong);
    background: var(--b4-color-canvas-raised);
    padding: var(--b4-space-3) 0 var(--b4-space-5);
  }

  .primary-nav.is-open {
    display: block;
  }

  .primary-nav .menu {
    width: min(100% - 1.5rem, var(--b4-shell));
    margin-inline: auto;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .primary-nav li,
  .primary-nav a {
    width: 100%;
  }

  .primary-nav a {
    min-height: 3.25rem;
    border-bottom: 1px solid var(--b4-color-border);
    font-size: var(--b4-text-3);
  }

  .b4-mobile-nav-actions {
    width: min(100% - 1.5rem, var(--b4-shell));
    display: grid;
    gap: var(--b4-space-2);
    margin: var(--b4-space-3) auto 0;
  }

  .b4-mobile-nav-actions .b4-nav-action {
    width: 100%;
  }

  .nav-actions {
    display: none;
  }

  .b4-footer-lead {
    grid-template-columns: 1fr;
    align-items: start;
  }
}

@media (max-width: 40rem) {
  .b4-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .b4-actions > * {
    width: 100%;
  }

  .b4-footer-grid {
    grid-template-columns: 1fr;
  }

  .b4-footer-bottom {
    flex-direction: column;
  }
}