.mk-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.8rem 1.35rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  font-size: 0.92rem;
  letter-spacing: 0.005em;
  text-decoration: none;
  border-radius: 0.65rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
  position: relative;
}

.mk-btn--primary {
  background: var(--mk-bone);
  color: var(--mk-ink);
  border-color: var(--mk-bone);
}
.mk-btn--primary:hover {
  background: #fff;
  border-color: #fff;
  transform: translateY(-1px);
  color: var(--mk-ink);
}
.mk-btn--ghost {
  background: transparent;
  color: var(--mk-bone);
  border-color: rgba(221, 214, 196, 0.35);
}
.mk-btn--ghost:hover {
  background: rgba(221, 214, 196, 0.06);
  color: var(--mk-bone);
  border-color: rgba(221, 214, 196, 0.6);
}
.mk-btn--ink {
  background: var(--mk-ink);
  color: var(--mk-bone);
  border-color: var(--mk-ink);
}
.mk-btn--ink:hover {
  background: var(--mk-ink-3);
  color: var(--mk-bone);
  transform: translateY(-1px);
}
.mk-btn--outline {
  background: transparent;
  color: var(--mk-ink);
  border-color: var(--mk-rule-strong);
}
.mk-btn--outline:hover {
  background: var(--mk-ink);
  color: var(--mk-bone);
  border-color: var(--mk-ink);
  transform: translateY(-1px);
}
.mk-btn .mk-arrow {
  display: inline-block;
  transition: transform 0.18s ease;
}
.mk-btn:hover .mk-arrow { transform: translateX(3px); }

.mk-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: 'Outfit', sans-serif;
  font-weight: 500;
  color: var(--mk-navy);
  text-decoration: none;
  padding-bottom: 2px;
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0 1px;
  transition: color 0.15s ease, background-size 0.28s cubic-bezier(0.25, 1, 0.4, 1);
}
.mk-link:hover,
.mk-link:focus-visible {
  color: var(--mk-emerald);
  background-size: 100% 1px;
}
.mk-link--ondark { color: var(--mk-text-on-dark); }
.mk-link--ondark:hover,
.mk-link--ondark:focus-visible {
  color: var(--mk-bone);
}

.mk-link--script { color: var(--mk-paprika); }
.mk-link--script:hover,
.mk-link--script:focus-visible { color: var(--mk-brick); }

.mk-link--scope { color: var(--mk-emerald); }
.mk-link--scope:hover,
.mk-link--scope:focus-visible { color: var(--mk-emerald-deep); }

.mk-link--scrxiv { color: var(--mk-navy); }
.mk-link--scrxiv:hover,
.mk-link--scrxiv:focus-visible { color: var(--mk-navy-deep); }

.mk-link-row {
  display: block;
  margin-top: 0.85rem;
}

.mk-page .mk-prose a:not(.mk-btn),
.mk-page .mk-stack-cell .name a,
.mk-page .mk-footer a,
.pp-link,
.ab-link {
  text-decoration: none;
  padding-bottom: 2px;
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0 1px;
  transition: color 0.15s ease, background-size 0.28s cubic-bezier(0.25, 1, 0.4, 1);
}
.mk-page .mk-prose a:not(.mk-btn):hover,
.mk-page .mk-prose a:not(.mk-btn):focus-visible,
.mk-page .mk-stack-cell .name a:hover,
.mk-page .mk-stack-cell .name a:focus-visible,
.mk-page .mk-footer a:hover,
.mk-page .mk-footer a:focus-visible,
.pp-link:hover,
.pp-link:focus-visible,
.ab-link:hover,
.ab-link:focus-visible {
  background-size: 100% 1px;
}

.pp-link {
  color: var(--pp-accent);
  font-weight: 500;
  text-decoration: none;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.pp-link:hover {
  color: #1e3a5f;
}

.pp-link-more {
  font-size: 0.9rem;
  margin-top: 0.5rem;
  display: inline-block;
}

.ab-link {
  color: var(--ab-accent);
  font-weight: 500;
  text-decoration: none;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.ab-link:hover {
  color: #1e3a5f;
}

.pp-link,
.ab-link {
  padding-bottom: 2px;
  background-image: linear-gradient(currentColor, currentColor);
  background-position: 0 100%;
  background-repeat: no-repeat;
  background-size: 0 1px;
  transition: color 0.15s ease, background-size 0.28s cubic-bezier(0.25, 1, 0.4, 1);
}
.pp-link:hover,
.pp-link:focus-visible,
.ab-link:hover,
.ab-link:focus-visible {
  background-size: 100% 1px;
}

@media (max-width: 768px) {
  .ab-hero {
    padding: 1.5rem 0 2rem;
  }

  .ab-hero-title {
    font-size: 1.85rem;
  }

  .ab-founders-row {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .ab-founder-card {
    max-width: 100%;
  }
}