:root {
  --nav-height: 72px;
}

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: var(--nav-height);
}

.nav-link.active {
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 8px;
}

.gradient-text {
  background: linear-gradient(135deg, #43c5ef, #0969da);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.wave-animation {
  animation: wave 2.5s ease-in-out infinite;
  transform-origin: 70% 70%;
}

@keyframes wave {
  0%,
  100% { transform: rotate(0deg); }
  10%,
  30% { transform: rotate(14deg); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(-4deg); }
  50% { transform: rotate(10deg); }
}

.fade-in {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid #0969da;
  outline-offset: 3px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-youtube {
  background: #ef4444;
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(239, 68, 68, 0.25);
}

.btn-github {
  background: #111827;
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(17, 24, 39, 0.2);
}

.btn-instagram {
  background: linear-gradient(135deg, #ec4899, #8b5cf6);
  color: #ffffff;
  box-shadow: 0 8px 20px rgba(236, 72, 153, 0.25);
}

.btn-dark {
  background: #111827;
  reduce-motion: no-preference;
}

.is-loading [data-skeleton] {
  position: relative;
  overflow: hidden;
}

.is-loading [data-skeleton]::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    110deg,
    rgba(255, 255, 255, 0) 25%,
    rgba(148, 163, 184, 0.25) 50%,
    rgba(255, 255, 255, 0) 75%
  );
  transform: translateX(-100%);
  animation: shimmer 1.2s ease-in-out infinite;
  pointer-events: none;
}

@keyframes shimmer {
  100% {
    transform: translateX(100%);
  }
}