/* ==========================================================================
   animations.css
   Keyframes, transitions and hover/active motion used across the app.
   ========================================================================== */

/* ---------------------------------- Keyframes ---------------------------------- */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(14px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.18); }
}

@keyframes gradientPop {
  0% { transform: scale(0.985); }
  100% { transform: scale(1); }
}

/* ------------------------------- Entrance Animations ------------------------------- */

.animate-fade-in-up {
  animation: fadeInUp 0.7s var(--ease-standard);
}

.animate-fade-in {
  animation: fadeIn 0.5s var(--ease-standard);
}

/* ---------------------------------- Hover Motion ------------------------------------ */

.card {
  transition: box-shadow var(--duration-slow) var(--ease-standard),
              transform var(--duration-slow) var(--ease-standard);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.btn {
  transition: transform var(--duration-fast) var(--ease-standard),
              box-shadow var(--duration-base) var(--ease-standard),
              background var(--duration-base) var(--ease-standard),
              filter var(--duration-base) var(--ease-standard),
              border-color var(--duration-base) var(--ease-standard);
}

.btn-primary:hover {
  transform: translateY(-2px);
  filter: brightness(1.05);
  box-shadow: var(--shadow-btn-primary-hover);
}

.btn-primary:active {
  transform: translateY(0) scale(0.97);
  filter: brightness(0.98);
}

.btn-secondary:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
}

.btn-secondary:active {
  transform: translateY(0) scale(0.97);
  background: var(--color-code-bg);
}

.nav-link {
  transition: color var(--duration-base) var(--ease-standard);
}

.nav-link::after {
  transition: width var(--duration-base) var(--ease-standard);
}

.nav-link:hover::after {
  width: 100%;
}

/* ------------------------------- Gradient Preview Motion ---------------------------- */

.preview {
  transition: background var(--duration-gradient) var(--ease-standard);
}

/* Applied briefly via JS (element.classList) each time a new gradient renders */
.preview.pop {
  animation: gradientPop 0.42s var(--ease-standard);
}

.swatch {
  transition: background var(--duration-slow) var(--ease-standard);
}

/* ------------------------------------- Footer --------------------------------------- */

.heart {
  display: inline-block;
  animation: pulse 1.8s ease-in-out infinite;
}

/* -------------------------------------- Toast ---------------------------------------- */

.toast {
  opacity: 0;
  transform: translate(-50%, 16px);
  pointer-events: none;
  transition: opacity var(--duration-slow) var(--ease-standard),
              transform var(--duration-slow) var(--ease-standard);
}

.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}

/* Respect users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}