/* ─── Custom base styles ─── */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ─── Nav link underline on hover ─── */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 50%;
  width: 0;
  height: 2px;
  background: currentColor;
  opacity: 0.3;
  transition: all 0.2s ease;
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 60%;
  opacity: 0.6;
}

/* ─── Scroll reveal (progressive enhancement) ─── */
.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s ease, transform 0.6s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(24px);
  }

  .reveal.revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Mobile menu transitions ─── */
#mobile-menu {
  animation: slideDown 0.2s ease;
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Back to top button ─── */
#back-to-top {
  transition: opacity 0.3s ease, transform 0.3s ease;
}

#back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

#back-to-top:not(.visible) {
  transform: translateY(8px);
}

/* ─── Form focus ring animation ─── */
input:focus,
textarea:focus {
  box-shadow: 0 0 0 3px rgba(26, 92, 42, 0.15);
}

/* ─── Selection color ─── */
::selection {
  background: rgba(26, 92, 42, 0.2);
  color: inherit;
}

/* ─── Image hover zoom ─── */
img {
  transition: transform 0.4s ease;
}

/* ─── Reduced motion ─── */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  #back-to-top {
    transition: none;
  }
}