/**
 * ADONG HOMEPAGE - ADVANCED ANIMATIONS
 * 스크롤 애니메이션, 호버 효과, 최종 폴리시
 */

/* ==========================================
 * SCROLL-TRIGGERED ANIMATIONS
 * ========================================== */

/* Base animation states - ALL VISIBLE BY DEFAULT */
.fade-in {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
              transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.fade-in.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.slide-in-left {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.8s ease-out,
              transform 0.8s ease-out;
}

.slide-in-left.animate-in {
  opacity: 1;
  transform: translateX(0);
}

.slide-in-right {
  opacity: 1;
  transform: translateX(0);
  transition: opacity 0.8s ease-out,
              transform 0.8s ease-out;
}

.slide-in-right.animate-in {
  opacity: 1;
  transform: translateX(0);
}

.scale-in {
  opacity: 1;
  transform: scale(1);
  transition: opacity 0.6s ease-out,
              transform 0.6s ease-out;
}

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

/* ==========================================
 * ENHANCED HERO ANIMATIONS
 * ========================================== */

.hero-title {
  animation: hero-title-entrance 1.2s ease-out forwards;
  opacity: 0;
  transform: translateY(40px);
}

.hero-description {
  animation: hero-description-entrance 1.2s ease-out 0.3s forwards;
  opacity: 0;
  transform: translateY(30px);
}

.hero-cta {
  animation: hero-cta-entrance 1.2s ease-out 0.6s forwards;
  opacity: 0;
  transform: translateY(20px);
}

.hero-visual {
  animation: hero-visual-entrance 1.5s ease-out 0.4s forwards;
  opacity: 0;
  transform: scale(0.9);
}

@keyframes hero-title-entrance {
  0% {
    opacity: 0;
    transform: translateY(40px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-description-entrance {
  0% {
    opacity: 0;
    transform: translateY(30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-cta-entrance {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes hero-visual-entrance {
  0% {
    opacity: 0;
    transform: scale(0.9);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

/* ==========================================
 * STAGGERED CARD ANIMATIONS
 * ========================================== */

.feature-card,
.usecase-card {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.8s ease-out,
              transform 0.8s ease-out;
}

.feature-card.animate-in,
.usecase-card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays for cards */
.feature-card:nth-child(1) { transition-delay: 0.1s; }
.feature-card:nth-child(2) { transition-delay: 0.2s; }
.feature-card:nth-child(3) { transition-delay: 0.3s; }

.usecase-card:nth-child(1) { transition-delay: 0.1s; }
.usecase-card:nth-child(2) { transition-delay: 0.2s; }
.usecase-card:nth-child(3) { transition-delay: 0.3s; }

/* ==========================================
 * ENHANCED HOVER EFFECTS
 * ========================================== */

/* Button hover glow effect */
.btn-primary {
  position: relative;
  overflow: hidden;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  transition: left 0.5s ease;
}

.btn-primary:hover::before {
  left: 100%;
}

/* Card hover effects with subtle shadows */
.feature-card,
.usecase-card {
  transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.feature-card:hover,
.usecase-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

/* Navigation link hover effect */
.nav-link {
  position: relative;
  overflow: hidden;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.3s ease;
}

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

/* ==========================================
 * PARALLAX & SCROLL EFFECTS
 * ========================================== */

.parallax-bg {
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
}

/* Section reveal animations */
.section-header {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 1s ease-out,
              transform 1s ease-out;
}

.section-header.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================
 * LOADING ANIMATIONS
 * ========================================== */

.loading-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.loading-dots::after {
  content: '●●●';
  animation: loading-dots 1.5s infinite;
  color: currentColor;
  font-size: 13px;
}

@keyframes loading-dots {
  0%, 20% { opacity: 0.2; }
  50% { opacity: 1; }
  80%, 100% { opacity: 0.2; }
}

/* Spinner animation */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  display: inline-block;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: var(--gradient-primary);
  z-index: var(--z-tooltip);
  transition: width 0.1s ease;
}

/* ==========================================
 * MICRO-INTERACTIONS
 * ========================================== */

/* Focus ring animation */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
  animation: focus-ring 0.3s ease-out;
}

@keyframes focus-ring {
  0% {
    outline-color: transparent;
    outline-offset: 0;
  }
  100% {
    outline-color: var(--color-primary);
    outline-offset: 2px;
  }
}

/* Ripple effect for buttons */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.6s ease, height 0.6s ease;
}

.btn:active::after {
  width: 300px;
  height: 300px;
}

/* ==========================================
 * PERFORMANCE OPTIMIZATIONS
 * ========================================== */

/* Hardware acceleration for animations */
.feature-card,
.usecase-card,
.character-image,
.video-placeholder,
.btn,
.modal-container {
  will-change: transform;
  backface-visibility: hidden;
  perspective: 1000px;
}

/* 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;
    scroll-behavior: auto !important;
  }

  .parallax-bg {
    background-attachment: scroll;
  }

  .hero-title,
  .hero-description,
  .hero-cta,
  .hero-visual {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* ==========================================
 * HIGH-PERFORMANCE SCROLL ANIMATIONS
 * ========================================== */

/* Use CSS scroll-timeline when supported */
@supports (animation-timeline: scroll()) {
  .fade-in {
    animation: fade-in-scroll linear;
    animation-timeline: scroll();
    animation-range: entry 0% entry 50%;
  }

  @keyframes fade-in-scroll {
    0% {
      opacity: 0;
      transform: translateY(30px);
    }
    100% {
      opacity: 1;
      transform: translateY(0);
    }
  }
}

/* ==========================================
 * ENTRANCE ANIMATIONS FOR SECTIONS
 * ========================================== */

.section {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 1.2s ease-out,
              transform 1.2s ease-out;
}

.section.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* Sequential section reveals */
.section:nth-of-type(1) { transition-delay: 0.1s; }
.section:nth-of-type(2) { transition-delay: 0.2s; }
.section:nth-of-type(3) { transition-delay: 0.3s; }
.section:nth-of-type(4) { transition-delay: 0.4s; }

/* ==========================================
 * FOOTER ANIMATION
 * ========================================== */

.footer {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 1s ease-out,
              transform 1s ease-out;
}

.footer.animate-in {
  opacity: 1;
  transform: translateY(0);
}

/* ==========================================
 * MOBILE-SPECIFIC ANIMATIONS
 * ========================================== */

@media (max-width: 767px) {
  /* Simplified animations for mobile performance */
  .feature-card,
  .usecase-card {
    transition-duration: 0.4s;
  }

  .hero-title,
  .hero-description,
  .hero-cta,
  .hero-visual {
    animation-duration: 0.8s;
  }

  /* Reduce transform complexity on mobile */
  .feature-card:hover,
  .usecase-card:hover {
    transform: translateY(-0.1875rem);
  }
}