/**
 * Micro-interactions and Subtle Animations
 * Purposeful, delightful details that enhance user experience
 */

/* ============================================
   SMOOTH TRANSITIONS
   ============================================ */

* {
  transition-property: background-color, border-color, color, fill, stroke;
  transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
  transition-duration: 150ms;
}

/* Disable transitions on page load to prevent flash */
.preload * {
  transition: none !important;
}

/* ============================================
   FOCUS STATES - Enhanced Accessibility
   ============================================ */

/* Remove default outline and add custom focus ring */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: 2px solid var(--color-accent-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Enhanced focus for interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* ============================================
   LINK ANIMATIONS
   ============================================ */

/* Underline animation from left to right */
.nav-primary a,
.fancy-link {
  position: relative;
}

.nav-primary a::after,
.fancy-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent-primary);
  transition: width var(--transition-base);
}

.nav-primary a:hover::after,
.nav-primary a:focus-visible::after,
.fancy-link:hover::after,
.fancy-link:focus-visible::after {
  width: 100%;
}

/* ============================================
   BUTTON INTERACTIONS
   ============================================ */

.btn {
  position: relative;
  overflow: hidden;
  transform: translateY(0);
  transition: all var(--transition-base);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Ripple effect */
.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.5);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:active::before {
  width: 300px;
  height: 300px;
  transition: width 0s, height 0s;
}

/* ============================================
   CARD HOVER EFFECTS
   ============================================ */

.card,
.artifact-card,
.content-card,
.project-card {
  position: relative;
  overflow: hidden;
}

/* Subtle gradient on hover */
.card::before,
.artifact-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--color-accent-primary),
    var(--color-accent-light)
  );
  transform: translateX(-100%);
  transition: transform var(--transition-slow);
}

.card:hover::before,
.artifact-card:hover::before {
  transform: translateX(0);
}

/* Lift effect on hover */
.card,
.artifact-card,
.project-card {
  transform: translateY(0);
  transition: transform var(--transition-base),
              box-shadow var(--transition-base);
}

.card:hover,
.artifact-card:hover,
.project-card:hover {
  transform: translateY(-4px);
}

/* ============================================
   SCROLL PROGRESS INDICATOR
   ============================================ */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--color-accent-primary),
    var(--color-accent-light)
  );
  z-index: var(--z-sticky);
  transition: width var(--transition-fast);
  pointer-events: none;
}

/* Reading progress for articles */
.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-accent-primary);
  z-index: calc(var(--z-sticky) + 1);
  transition: width 100ms linear;
  pointer-events: none;
}

/* ============================================
   SMOOTH REVEAL ANIMATIONS
   ============================================ */

/* Elements fade in and slide up when visible */
[data-animate] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow),
              transform var(--transition-slow);
}

[data-animate].animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered animations for lists */
[data-stagger] {
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity var(--transition-base),
              transform var(--transition-base);
}

[data-stagger].animate-in {
  opacity: 1;
  transform: translateX(0);
}

/* ============================================
   LOADING STATES
   ============================================ */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-tertiary) 0%,
    var(--color-bg-secondary) 50%,
    var(--color-bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

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

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--color-border-default);
  border-top-color: var(--color-accent-primary);
  border-radius: 50%;
  animation: spinner-rotation 0.8s linear infinite;
}

@keyframes spinner-rotation {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================
   TOOLTIP ANIMATIONS
   ============================================ */

.tooltip {
  position: absolute;
  padding: var(--space-2) var(--space-3);
  background: var(--color-text-primary);
  color: var(--color-text-inverse);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  pointer-events: none;
  opacity: 0;
  transform: translateY(5px);
  transition: opacity var(--transition-fast),
              transform var(--transition-fast);
  z-index: var(--z-tooltip);
  white-space: nowrap;
}

.tooltip::before {
  content: '';
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-bottom-color: var(--color-text-primary);
}

.tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   BADGE PULSE ANIMATION
   ============================================ */

.badge-new,
.badge-updated {
  position: relative;
}

.badge-new::after {
  content: '';
  position: absolute;
  top: -2px;
  right: -2px;
  width: 8px;
  height: 8px;
  background: var(--color-error);
  border-radius: 50%;
  animation: badge-pulse 2s infinite;
}

@keyframes badge-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.7);
  }
  50% {
    box-shadow: 0 0 0 8px rgba(220, 38, 38, 0);
  }
}

/* ============================================
   DROPDOWN ANIMATIONS
   ============================================ */

.dropdown-menu {
  opacity: 0;
  transform: translateY(-10px) scale(0.95);
  transform-origin: top;
  transition: opacity var(--transition-fast),
              transform var(--transition-base);
  pointer-events: none;
}

.dropdown-menu.active {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

/* ============================================
   MODAL ANIMATIONS
   ============================================ */

.modal {
  opacity: 0;
  transform: scale(0.9);
  transition: opacity var(--transition-base),
              transform var(--transition-base);
  pointer-events: none;
}

.modal.active {
  opacity: 1;
  transform: scale(1);
  pointer-events: all;
}

.modal-backdrop {
  opacity: 0;
  transition: opacity var(--transition-base);
}

.modal-backdrop.active {
  opacity: 1;
}

/* ============================================
   CODE BLOCK ENHANCEMENTS
   ============================================ */

pre {
  position: relative;
}

.copy-code-btn {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  cursor: pointer;
  opacity: 0;
  transform: translateY(-5px);
  transition: all var(--transition-fast);
}

pre:hover .copy-code-btn {
  opacity: 1;
  transform: translateY(0);
}

.copy-code-btn:hover {
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-accent-primary);
}

.copy-code-btn.copied {
  background: var(--color-success);
  color: var(--color-text-inverse);
  border-color: var(--color-success);
}

/* ============================================
   BACK TO TOP BUTTON
   ============================================ */

#back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
  border: none;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px) scale(0.8);
  transition: all var(--transition-base);
  z-index: var(--z-fixed);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
}

#back-to-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-xl);
}

#back-to-top:active {
  transform: scale(0.95);
}

/* ============================================
   THEME TOGGLE ANIMATION
   ============================================ */

.theme-toggle {
  position: fixed;
  bottom: calc(var(--space-8) + 60px);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border-default);
  cursor: pointer;
  z-index: var(--z-fixed);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: var(--shadow-xl);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-toggle.rotating {
  animation: theme-toggle-rotate 0.5s ease;
}

@keyframes theme-toggle-rotate {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ============================================
   IMAGE LOAD ANIMATION
   ============================================ */

img {
  opacity: 1;
  transition: opacity var(--transition-base);
}

img:not(.loaded) {
  opacity: 0.5;
  filter: blur(5px);
}

img.loaded {
  opacity: 1;
  filter: blur(0);
}

/* ============================================
   TABLE INTERACTIONS
   ============================================ */

tbody tr {
  transition: background-color var(--transition-fast);
}

tbody tr:hover {
  background-color: var(--color-bg-secondary);
}

th {
  transition: color var(--transition-fast);
}

th:hover {
  color: var(--color-accent-primary);
}

/* ============================================
   FORM ELEMENT INTERACTIONS
   ============================================ */

input,
textarea,
select {
  transition: all var(--transition-fast);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--color-accent-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* ============================================
   NOTIFICATION ANIMATIONS
   ============================================ */

.notification {
  opacity: 0;
  transform: translateX(100%);
  transition: all var(--transition-slow);
}

.notification.show {
  opacity: 1;
  transform: translateX(0);
}

.notification.hide {
  opacity: 0;
  transform: translateX(100%);
}

/* ============================================
   REDUCED MOTION SUPPORT
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .skeleton {
    animation: none;
  }

  .loading-spinner {
    animation: none;
  }
}

/* ============================================
   HIGH CONTRAST MODE SUPPORT
   ============================================ */

@media (prefers-contrast: high) {
  * {
    border-width: 2px !important;
  }

  button,
  .btn {
    font-weight: var(--weight-bold);
  }
}