/* animations.css — Scroll reveals, zooms, transitions, and motion design.
 *
 * Every animation respects prefers-reduced-motion. When the reader has asked
 * their OS to cut motion, these degrade to instant transitions or static.
 */

/* -- Smooth scrolling globally ------------------------------------------- */

html {
  scroll-behavior: smooth;
}

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

/* -- Scroll reveal: elements fade/slide in as they enter the viewport ---- */

.scroll-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.scroll-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delays for sequential cards */
.scroll-reveal[data-delay="1"] { transition-delay: 0.08s; }
.scroll-reveal[data-delay="2"] { transition-delay: 0.16s; }
.scroll-reveal[data-delay="3"] { transition-delay: 0.24s; }
.scroll-reveal[data-delay="4"] { transition-delay: 0.32s; }

/* -- Zoom on hover: subtle scale on interactive elements ----------------- */

.zoom-hover {
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.25s ease;
}

.zoom-hover:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.zoom-hover:active {
  transform: scale(0.97);
}

/* -- Press effect on buttons --------------------------------------------- */

.press {
  transition: transform 0.15s cubic-bezier(0.16, 1, 0.3, 1);
}

.press:active {
  transform: scale(0.96);
}

/* -- Fade-in for screen transitions -------------------------------------- */

.screen-enter {
  animation: screenFadeIn 0.45s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes screenFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* -- Parallax-like subtle float ------------------------------------------ */

.float {
  animation: gentleFloat 6s ease-in-out infinite;
}

@keyframes gentleFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* -- Pulse for loading / attention --------------------------------------- */

.pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

/* -- Shimmer for skeleton loading ---------------------------------------- */

.shimmer {
  background: linear-gradient(
    90deg,
    var(--surface) 25%,
    var(--raised) 50%,
    var(--surface) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease infinite;
}

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* -- Slide-in from sides ------------------------------------------------- */

.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide-in-left.is-visible,
.slide-in-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* -- Scale-in: zoom from center ------------------------------------------ */

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.scale-in.is-visible {
  opacity: 1;
  transform: scale(1);
}

/* -- Focus ring animation for accessibility ------------------------------ */

:focus-visible {
  outline: 3px solid var(--ember);
  outline-offset: 3px;
  border-radius: 4px;
  transition: outline-offset 0.2s ease;
}

/* -- Reduced motion: disable all animation ------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .scroll-reveal,
  .slide-in-left,
  .slide-in-right,
  .scale-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .zoom-hover:hover {
    transform: none;
    box-shadow: none;
  }

  .float,
  .pulse,
  .shimmer {
    animation: none;
  }

  .screen-enter {
    animation: none;
  }

  .press:active {
    transform: none;
  }
}