/* =============================================================================
   ANIMATIONS & UTILITIES — Scroll-reveal, micro-interactions, helpers
   ============================================================================= */

/* ---------------------------------------------------------------------------
   SCROLL-REVEAL ANIMATIONS
--------------------------------------------------------------------------- */

/* Elements animate in when JS adds .is-visible */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Stagger delays for card grids */
.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }

/* Fade only (no translate) */
.reveal--fade {
  transform: none;
}

/* Slide from left */
.reveal--left {
  transform: translateX(-24px);
}

.reveal--left.is-visible {
  transform: translateX(0);
}

/* Slide from right */
.reveal--right {
  transform: translateX(24px);
}

.reveal--right.is-visible {
  transform: translateX(0);
}

/* Reduced motion — respect user preference */
@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal--fade,
  .reveal--left,
  .reveal--right {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------------------------------------------------------------------------
   HERO SECTION
--------------------------------------------------------------------------- */

.hero {
  position: relative;
  background: var(--gradient-hero);
  overflow: hidden;
  padding-block: var(--space-24) var(--space-20);
  text-align: center;
}

/* Animated gradient orbs */
.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  left: -200px;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
  animation: hero-orb 8s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -200px;
  right: -200px;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.25) 0%, transparent 70%);
  animation: hero-orb 10s ease-in-out infinite alternate-reverse;
  pointer-events: none;
}

@keyframes hero-orb {
  0%   { transform: translate(0, 0) scale(1); }
  100% { transform: translate(80px, 60px) scale(1.15); }
}

@media (prefers-reduced-motion: reduce) {
  .hero::before,
  .hero::after {
    animation: none;
  }
}

/* Grid noise texture overlay */
.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

.hero__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(99, 102, 241, 0.2);
  border: 1px solid rgba(99, 102, 241, 0.4);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  color: var(--color-primary-300);
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  margin-bottom: var(--space-6);
  animation: fadeSlideUp 0.6s ease both;
}

.hero__title {
  font-family: var(--font-serif);
  font-size: var(--text-5xl);
  font-weight: var(--font-extrabold);
  color: #F1F5F9;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-6);
  animation: fadeSlideUp 0.6s 0.1s ease both;
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: #94A3B8;
  max-width: 52ch;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: var(--leading-relaxed);
  animation: fadeSlideUp 0.6s 0.2s ease both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: center;
  animation: fadeSlideUp 0.6s 0.3s ease both;
}

/* ---------------------------------------------------------------------------
   KEYFRAMES
--------------------------------------------------------------------------- */

@keyframes fadeSlideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse-glow {
  0%, 100% { box-shadow: var(--glow-brand); }
  50%       { box-shadow: 0 0 60px rgba(99, 102, 241, 0.4); }
}

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

/* Skeleton loading animation */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-border) 25%,
    var(--color-bg-secondary) 50%,
    var(--color-border) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

/* ---------------------------------------------------------------------------
   FLOATING LABEL INPUT ANIMATION (for forms)
--------------------------------------------------------------------------- */

.form-item--float {
  position: relative;
}

.form-item--float label {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  transition: all var(--transition-fast);
  pointer-events: none;
  color: var(--color-text-disabled);
  font-size: var(--text-sm);
  margin: 0;
}

.form-item--float input:focus + label,
.form-item--float input:not(:placeholder-shown) + label {
  top: 0;
  transform: translateY(-50%);
  font-size: var(--text-xs);
  color: var(--color-brand-text);
  background: var(--color-surface);
  padding-inline: var(--space-1);
}

/* ---------------------------------------------------------------------------
   UTILITY CLASSES
--------------------------------------------------------------------------- */

/* Visually hidden (accessible) */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Clearfix */
.clearfix::after {
  content: '';
  display: table;
  clear: both;
}

/* Truncate text */
.truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Gradient border trick */
.gradient-border {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
}

.gradient-border::before {
  content: '';
  position: absolute;
  inset: -1.5px;
  border-radius: calc(var(--radius-xl) + 1.5px);
  background: var(--gradient-brand);
  z-index: -1;
}

/* Section divider */
.section-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  margin-block: var(--space-16);
}

/* Highlighted text */
mark {
  background: linear-gradient(120deg, rgba(99, 102, 241, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
  color: var(--color-text);
  padding: 1px 4px;
  border-radius: var(--radius-sm);
}