/* ========================================
   Animations & Micro-interactions
   ネイティブアプリレベルのアニメーション
   ======================================== */

/* ========== Spring Animations（バネアニメーション） ========== */

@keyframes spring-in {
  0% {
    transform: scale(0.8);
    opacity: 0;
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes spring-slide-up {
  0% {
    transform: translateY(100%);
    opacity: 0;
  }
  60% {
    transform: translateY(-2%);
  }
  80% {
    transform: translateY(1%);
  }
  100% {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes spring-pop {
  0% {
    transform: scale(0);
    opacity: 0;
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

/* ユーティリティクラス */
.spring-in {
  animation: spring-in 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.spring-slide-up {
  animation: spring-slide-up 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.spring-pop {
  animation: spring-pop 0.35s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ========== Skeleton Loading（シマーアニメーション） ========== */

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-200) 25%,
    var(--bg-300) 50%,
    var(--bg-200) 75%
  );
  background-size: 1000px 100%;
  animation: shimmer 2s infinite linear;
  border-radius: var(--radius-md);
}

.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
}

.skeleton-title {
  height: 1.5rem;
  width: 60%;
  margin-bottom: 1rem;
}

.skeleton-card {
  height: 200px;
  border-radius: var(--radius-lg);
}

.skeleton-circle {
  border-radius: 50%;
  width: 48px;
  height: 48px;
}

/* Dark mode skeleton */
[data-theme="dark"] .skeleton {
  background: linear-gradient(
    90deg,
    rgba(30, 41, 59, 0.8) 25%,
    rgba(51, 65, 85, 0.8) 50%,
    rgba(30, 41, 59, 0.8) 75%
  );
  background-size: 1000px 100%;
}

/* ========== Ripple Effect（波紋エフェクト） ========== */

@keyframes ripple {
  to {
    transform: scale(4);
    opacity: 0;
  }
}

.ripple-container {
  position: relative;
  overflow: hidden;
}

.ripple-effect {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.6) 0%, rgba(255, 255, 255, 0) 70%);
  transform: scale(0);
  animation: ripple 0.6s ease-out;
  pointer-events: none;
}

/* ========== Hover Effects（ホバーエフェクト） ========== */

.hover-lift {
  transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1),
              box-shadow 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--elevation-4);
}

.hover-glow {
  transition: box-shadow 0.3s ease;
}

.hover-glow:hover {
  box-shadow:
    0 0 20px rgba(113, 196, 239, 0.3),
    var(--elevation-3);
}

.hover-scale {
  transition: transform 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.hover-scale:hover {
  transform: scale(1.05);
}

.hover-brightness {
  transition: filter 0.2s ease;
}

.hover-brightness:hover {
  filter: brightness(1.1);
}

/* ========== Press Feedback（プレスフィードバック） ========== */

.press-feedback {
  transition: transform 0.1s cubic-bezier(0.2, 0, 0, 1);
}

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

/* ========== Fade Animations（フェードアニメーション） ========== */

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes fade-out {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

.fade-in {
  animation: fade-in 0.3s ease-out;
}

.fade-out {
  animation: fade-out 0.3s ease-out;
}

/* ========== Slide Animations（スライドアニメーション） ========== */

@keyframes slide-in-right {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slide-in-left {
  from {
    transform: translateX(-100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes slide-in-up {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slide-in-down {
  from {
    transform: translateY(-100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.slide-in-right {
  animation: slide-in-right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in-left {
  animation: slide-in-left 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in-up {
  animation: slide-in-up 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-in-down {
  animation: slide-in-down 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== Spin Animation（回転アニメーション） ========== */

@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.spin {
  animation: spin 1s linear infinite;
}

.spin-slow {
  animation: spin 2s linear infinite;
}

/* ========== Pulse Animation（パルスアニメーション） ========== */

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes pulse-scale {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

.pulse-scale {
  animation: pulse-scale 2s ease-in-out infinite;
}

/* ========== Shake Animation（振動アニメーション） ========== */

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

.shake {
  animation: shake 0.5s;
}

/* ========== Accessibility - Reduced Motion ========== */
/* ユーザーが「視差効果を減らす」を有効にしている場合 */

@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;
  }

  .spring-in,
  .spring-slide-up,
  .spring-pop,
  .fade-in,
  .fade-out,
  .slide-in-right,
  .slide-in-left,
  .slide-in-up,
  .slide-in-down,
  .hover-lift:hover,
  .hover-scale:hover,
  .press-feedback:active {
    animation: none;
    transform: none;
    transition: none;
  }
}

/* ========== Usage Examples ========== */
/*
  基本的な使い方:

  <div class="spring-in">コンテンツ</div>
  <div class="card hover-lift">カード</div>
  <button class="btn press-feedback">ボタン</button>
  <div class="skeleton skeleton-text"></div>

  アニメーションの選び方:
  - spring-in: 要素が最初に表示される時
  - spring-slide-up: ボトムシートなど下から上に出現
  - spring-pop: 小さな要素（バッジ、アイコンなど）
  - hover-lift: カードやボタンのホバー
  - press-feedback: タップ可能な全要素
  - skeleton: ローディング中のプレースホルダー
*/