:root {
  --motion-ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --motion-ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --motion-duration-lg: 900ms;
  --motion-duration-md: 520ms;
  --motion-duration-sm: 220ms;
  --reading-float-y: 8px;
  --reading-float-x: 3px;
  --reading-float-tilt: 1.5deg;
}

@keyframes readingFloat {
  0% {
    transform: translate3d(0, 0, 0) rotateX(1deg) rotateY(calc(var(--reading-float-tilt) * -1));
  }
  25% {
    transform: translate3d(var(--reading-float-x), calc(var(--reading-float-y) * -0.45), 0) rotateX(1.2deg) rotateY(0.75deg);
  }
  50% {
    transform: translate3d(0, calc(var(--reading-float-y) * -1), 0) rotateX(0.65deg) rotateY(var(--reading-float-tilt));
  }
  75% {
    transform: translate3d(calc(var(--reading-float-x) * -1), calc(var(--reading-float-y) * -0.4), 0) rotateX(0.9deg) rotateY(0.35deg);
  }
  100% {
    transform: translate3d(0, 0, 0) rotateX(1deg) rotateY(calc(var(--reading-float-tilt) * -1));
  }
}

@keyframes readingGlowA {
  0%,
  100% {
    opacity: 0.32;
    filter: blur(20px);
  }
  50% {
    opacity: 0.5;
    filter: blur(26px);
  }
}

@keyframes readingGlowB {
  0%,
  100% {
    opacity: 0.42;
    filter: blur(14px);
  }
  50% {
    opacity: 0.58;
    filter: blur(20px);
  }
}

@keyframes overlayBreathe {
  0%,
  100% {
    background: rgba(0, 0, 0, 0.5);
  }
  50% {
    background: rgba(0, 0, 0, 0.56);
  }
}

.motion-ok .glass-card {
  animation: readingFloat 22s ease-in-out infinite;
  transition:
    transform 700ms var(--motion-ease-out),
    box-shadow 700ms var(--motion-ease-out),
    filter var(--motion-duration-md) var(--motion-ease-out);
}

.motion-ok section.glass-card:nth-of-type(2n) {
  animation-duration: 25s;
  animation-delay: -5s;
}

.motion-ok section.glass-card:nth-of-type(3n) {
  animation-duration: 28s;
  animation-delay: -11s;
}

.motion-ok .glass-card::before {
  animation: readingGlowA 14s ease-in-out infinite;
}

.motion-ok .glass-card::after {
  animation: readingGlowB 17s ease-in-out infinite;
}

.motion-ok .glass-card:hover,
.motion-ok .glass-card:focus-within {
  animation-play-state: paused;
  transform: translate3d(0, -4px, 0) rotateX(0.85deg) rotateY(-0.6deg) scale(1.01);
  box-shadow: 0 46px 92px rgba(0, 0, 0, 0.66);
}

.motion-ok #overlay {
  animation: overlayBreathe 18s ease-in-out infinite;
  transition: background var(--motion-duration-md) var(--motion-ease-out);
}

.motion-ok .book-card-face {
  transition:
    box-shadow 700ms var(--motion-ease-out),
    border-color 700ms var(--motion-ease-out);
}

.motion-ok .section-content {
  transition: transform 700ms var(--motion-ease-out);
}

.motion-ok .glass-card:hover .book-card-face,
.motion-ok .glass-card:focus-within .book-card-face {
  box-shadow: 0 46px 105px rgba(0, 0, 0, 0.72), inset 0 0 56px rgba(255, 255, 255, 0.07);
}

.motion-ok .glass-card:hover .section-content,
.motion-ok .glass-card:focus-within .section-content {
  transform: translate3d(0, -2px, 0);
}

/* Stronger scroll-reveal animations (JS adds `.motion-ok` + `[data-reveal]`). */
.motion-ok [data-reveal] {
  opacity: 0;
  filter: blur(12px);
  transition:
    opacity var(--motion-duration-lg) var(--motion-ease-out),
    filter var(--motion-duration-lg) var(--motion-ease-out),
    transform var(--motion-duration-lg) var(--motion-ease-out);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, filter, transform;
}

.motion-ok [data-reveal="lift"] {
  transform: translate3d(0, 22px, 0) scale(0.985);
}

.motion-ok [data-reveal="pop"] {
  transform: translate3d(0, 18px, 0) scale(0.97);
}

.motion-ok [data-reveal="fade"] {
  transform: none;
}

.motion-ok [data-reveal].is-visible {
  opacity: 1;
  filter: blur(0);
  transform: none;
}

/* Card hover upgrades (keeps existing floating glass panels untouched). */
@media (hover: hover) and (pointer: fine) {
  .motion-ok .project-card,
  .motion-ok .project-category,
  .motion-ok .music-panel {
    position: relative;
    isolation: isolate;
    transform: translateZ(0);
    transition:
      transform var(--motion-duration-md) var(--motion-ease-out),
      box-shadow var(--motion-duration-md) var(--motion-ease-out),
      border-color var(--motion-duration-md) var(--motion-ease-out),
      filter var(--motion-duration-md) var(--motion-ease-out);
    will-change: transform;
  }

  .motion-ok .project-card > *,
  .motion-ok .project-category > *,
  .motion-ok .music-panel > * {
    position: relative;
    z-index: 1;
  }

  .motion-ok .project-card::after,
  .motion-ok .project-category::after,
  .motion-ok .music-panel::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(
      120deg,
      transparent 30%,
      rgba(138, 232, 255, 0.22) 48%,
      transparent 66%
    );
    background-size: 200% 100%;
    background-position: 0% 0%;
    opacity: 0;
    z-index: 0;
    transition:
      opacity var(--motion-duration-sm) ease,
      background-position var(--motion-duration-lg) var(--motion-ease-out);
    pointer-events: none;
  }

  .motion-ok .project-card:hover,
  .motion-ok .music-panel:hover {
    transform: translate3d(0, -10px, 0) scale(1.02);
    filter: brightness(1.06);
    box-shadow: 0 22px 70px rgba(0, 0, 0, 0.55);
  }

  .motion-ok .project-category:hover {
    transform: translate3d(0, -8px, 0) scale(1.01);
    filter: brightness(1.04);
    box-shadow: 0 26px 80px rgba(0, 0, 0, 0.5);
  }

  .motion-ok .project-card:hover::after,
  .motion-ok .project-category:hover::after,
  .motion-ok .music-panel:hover::after {
    opacity: 1;
    background-position: 100% 0%;
  }
}

/* Button micro-interactions (doesn't change your background mp4 or floating panels). */
.motion-ok .btn-outline-light {
  transition:
    color 0.4s ease,
    transform var(--motion-duration-sm) var(--motion-ease-spring),
    box-shadow var(--motion-duration-sm) var(--motion-ease-out),
    filter var(--motion-duration-sm) var(--motion-ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .motion-ok .btn-outline-light:hover {
    transform: translate3d(0, -2px, 0);
    box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
    filter: brightness(1.03);
  }

  .motion-ok .btn-outline-light:active {
    transform: translate3d(0, 0, 0) scale(0.99);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.3);
  }
}

/* Cleaner, animated underline for key links. */
.motion-ok .project-links a,
.motion-ok .back-link,
.motion-ok .navbar .nav-link {
  position: relative;
  text-decoration: none;
}

.motion-ok .project-links a {
  border-bottom: none;
}

.motion-ok .project-links a::after,
.motion-ok .back-link::after,
.motion-ok .navbar .nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--motion-duration-md) var(--motion-ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .motion-ok .project-links a:hover::after,
  .motion-ok .back-link:hover::after,
  .motion-ok .navbar .nav-link:hover::after {
    transform: scaleX(1);
  }
}

/* Visible keyboard focus. */
.motion-ok :focus-visible {
  outline: 2px solid rgba(138, 232, 255, 0.8);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .motion-ok [data-reveal] {
    opacity: 1;
    filter: none;
    transform: none;
    transition: none;
  }

  .motion-ok .glass-card,
  .motion-ok .glass-card::before,
  .motion-ok .glass-card::after,
  .motion-ok .project-card,
  .motion-ok .project-category,
  .motion-ok .music-panel,
  .motion-ok .btn-outline-light {
    animation: none;
    transition: none;
  }
}