/* CSS Variables (Custom Properties) */
:root {
  /* カラーパレット */
  --primary-color: #6366f1;
  --secondary-color: #8b5cf6;
  --accent-color: #06b6d4;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  
  /* ライトテーマ */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --shadow-color: rgba(0, 0, 0, 0.1);
  
  /* スペーシング */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* タイポグラフィ */
  --font-family-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* ボーダー半径 */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* アニメーション */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.3s ease-out;
  --transition-slow: 0.5s ease-out;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal: 1040;
  --z-popover: 1050;
  --z-tooltip: 1060;
}

/* ダークテーマ */
.dark-theme {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #64748b;
  --border-color: #334155;
  --shadow-color: rgba(0, 0, 0, 0.3);
}

/* リセットとベーススタイル */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* コンテナ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ヘッダー */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-fixed);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-base);
}

.dark-theme .header {
  background: rgba(15, 23, 42, 0.8);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) var(--spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: var(--font-size-xl);
  color: var(--primary-color);
}

.logo-animation {
  width: 8px;
  height: 8px;
  background: var(--primary-color);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-base);
}

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

.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.theme-toggle {
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  cursor: pointer;
  padding: var(--spacing-sm);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
}

.hamburger {
  display: none;
  flex-direction: column;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  gap: 4px;
}

.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

/* ヒーローセクション */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  overflow: hidden;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(40px);
  opacity: 0.7;
  animation: float 6s ease-in-out infinite;
}

.orb-1 {
  width: 300px;
  height: 300px;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 200px;
  height: 200px;
  background: linear-gradient(45deg, var(--accent-color), var(--success-color));
  top: 60%;
  right: 20%;
  animation-delay: 2s;
}

.orb-3 {
  width: 150px;
  height: 150px;
  background: linear-gradient(45deg, var(--warning-color), var(--error-color));
  bottom: 20%;
  left: 60%;
  animation-delay: 4s;
}

.hero-content {
  text-align: center;
  z-index: 2;
  max-width: 800px;
  padding: var(--spacing-xl);
}

.hero-title {
  font-size: var(--font-size-6xl);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.title-line {
  display: block;
  opacity: 0;
  transform: translateY(30px);
  animation: slideInUp 0.8s ease-out forwards;
}

.title-line:nth-child(2) {
  animation-delay: 0.2s;
}

.title-line:nth-child(3) {
  animation-delay: 0.4s;
}

.highlight {
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  opacity: 0;
  animation: fadeIn 0.8s ease-out 0.6s forwards;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeIn 0.8s ease-out 0.8s forwards;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid var(--text-secondary);
  border-bottom: 2px solid var(--text-secondary);
  transform: rotate(45deg);
}

/* ボタンスタイル */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  overflow: hidden;
  min-width: 140px;
}

.btn-primary {
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.btn-ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: scale(0);
  pointer-events: none;
}

.btn-ripple.animate {
  animation: ripple 0.6s linear;
}

/* 機能セクション */
.features {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  opacity: 0;
  transform: translateY(30px);
  transition: all var(--transition-slow);
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.feature-card {
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  transition: all var(--transition-base);
  opacity: 0;
  transform: translateY(30px);
}

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

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 20px 40px var(--shadow-color);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.card-icon {
  font-size: var(--font-size-2xl);
}

.card-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
}

/* アニメーションデモ */
.animation-demo {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.bouncing-ball {
  width: 20px;
  height: 20px;
  background: var(--primary-color);
  border-radius: 50%;
  animation: bounce 1s infinite;
}

/* 3D変換デモ */
.transform-demo {
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
  margin-top: var(--spacing-lg);
}

.rotating-cube {
  width: 60px;
  height: 60px;
  position: relative;
  transform-style: preserve-3d;
  animation: rotateCube 4s infinite linear;
}

.cube-face {
  position: absolute;
  width: 60px;
  height: 60px;
  background: rgba(99, 102, 241, 0.8);
  border: 1px solid var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xs);
  color: white;
  font-weight: 600;
}

.front { transform: rotateY(0deg) translateZ(30px); }
.back { transform: rotateY(180deg) translateZ(30px); }
.right { transform: rotateY(90deg) translateZ(30px); }
.left { transform: rotateY(-90deg) translateZ(30px); }
.top { transform: rotateX(90deg) translateZ(30px); }
.bottom { transform: rotateX(-90deg) translateZ(30px); }

/* グラデーションデモ */
.gradient-demo {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.gradient-box {
  width: 100px;
  height: 40px;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color), var(--accent-color));
  border-radius: var(--radius-lg);
  animation: gradientShift 3s ease-in-out infinite;
}

/* インタラクティブセクション */
.interactive-section {
  margin: var(--spacing-3xl) 0;
}

.subsection-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.control-group {
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.control-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

/* スライダー */
.slider {
  width: 100%;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  outline: none;
  margin-bottom: var(--spacing-md);
  -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

.slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  border: none;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

/* プログレスバー */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 50%;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

/* トグルスイッチ */
.toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  cursor: pointer;
}

.toggle input {
  display: none;
}

.toggle-slider {
  width: 50px;
  height: 24px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  position: relative;
  transition: background-color var(--transition-base);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-base);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.toggle input:checked + .toggle-slider {
  background: var(--primary-color);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(26px);
}

/* カラーピッカー */
.color-picker {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.color-picker input[type="color"] {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.color-preview {
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  border-radius: var(--radius-md);
  border: 2px solid var(--border-color);
}

/* タブ */
.tabs-section {
  margin: var(--spacing-3xl) 0;
}

.tabs {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.tab-button {
  padding: var(--spacing-md) var(--spacing-lg);
  background: none;
  border: none;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  transition: all var(--transition-fast);
  position: relative;
}

.tab-button.active {
  color: var(--primary-color);
  background: var(--bg-primary);
}

.tab-button.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-color);
}

.tab-content {
  min-height: 200px;
}

.tab-panel {
  display: none;
  padding: var(--spacing-lg);
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

/* グリッドデモ */
.grid-demo {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.grid-item {
  aspect-ratio: 1;
  background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 600;
  transition: transform var(--transition-base);
}

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

/* フレックスデモ */
.flex-demo {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.flex-item {
  flex: 1;
  padding: var(--spacing-lg);
  background: var(--accent-color);
  color: white;
  text-align: center;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: flex var(--transition-base);
}

.flex-item:hover {
  flex: 1.5;
}

/* アニメーションショーケース */
.animation-showcase {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

.pulse-animation {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--success-color);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  animation: pulse 2s infinite;
}

.shake-animation {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--warning-color);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  animation: shake 1s infinite;
}

.rotate-animation {
  padding: var(--spacing-md) var(--spacing-lg);
  background: var(--error-color);
  color: white;
  border-radius: var(--radius-md);
  font-weight: 600;
  animation: rotate 2s linear infinite;
}

/* ギャラリー */
.gallery {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-primary);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.gallery-item {
  aspect-ratio: 4/3;
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-base);
  opacity: 0;
  transform: translateY(30px);
}

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

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

.gallery-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--spacing-lg);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  color: white;
  transform: translateY(100%);
  transition: transform var(--transition-base);
}

.gallery-item:hover .gallery-overlay {
  transform: translateY(0);
}

.gallery-overlay h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* コンタクトフォーム */
.contact {
  padding: var(--spacing-3xl) 0;
  background: var(--bg-secondary);
}

.contact-form {
  max-width: 600px;
  margin: 0 auto;
}

.form-group {
  position: relative;
  margin-bottom: var(--spacing-xl);
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-base);
}

.form-group input:focus + .form-line,
.form-group textarea:focus + .form-line {
  width: 100%;
}

.submit-btn {
  width: 100%;
  position: relative;
}

.submit-btn.loading span {
  opacity: 0;
}

.loading-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid white;
  border-radius: 50%;
  opacity: 0;
  animation: spin 1s linear infinite;
}

.submit-btn.loading .loading-spinner {
  opacity: 1;
}

/* フッター */
.footer {
  background: var(--bg-tertiary);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.footer-section ul {
  list-style: none;
}

.footer-section ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--primary-color);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  font-size: var(--font-size-lg);
  transition: all var(--transition-base);
}

.social-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow-color);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
}

/* モーダル */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
  z-index: var(--z-modal);
  align-items: center;
  justify-content: center;
}

.modal-content {
  background: var(--bg-primary);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  max-width: 500px;
  width: 90%;
  position: relative;
  animation: modalSlideIn 0.3s ease-out;
}

.modal-close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-lg);
  font-size: var(--font-size-2xl);
  cursor: pointer;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.modal-close:hover {
  color: var(--text-primary);
}

/* アニメーション */
@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateY(0);
  }
  40% {
    transform: translateY(-20px);
  }
  60% {
    transform: translateY(-10px);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  50% {
    transform: scale(1.1);
    opacity: 0.7;
  }
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes rotateCube {
  0% {
    transform: rotateX(0deg) rotateY(0deg);
  }
  100% {
    transform: rotateX(360deg) rotateY(360deg);
  }
}

@keyframes gradientShift {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-5px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(5px);
  }
}

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

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

@keyframes spin {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: scale(0.9) translateY(-20px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: var(--spacing-2xl);
    transition: left var(--transition-base);
    border-top: 1px solid var(--border-color);
  }

  .nav-menu.active {
    left: 0;
  }

  .hamburger {
    display: flex;
  }

  .hero-title {
    font-size: var(--font-size-4xl);
  }

  .hero-description {
    font-size: var(--font-size-lg);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .controls-grid {
    grid-template-columns: 1fr;
  }

  .tabs {
    flex-wrap: wrap;
  }

  .animation-showcase {
    flex-direction: column;
    align-items: center;
  }

  .flex-demo {
    flex-direction: column;
  }

  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .social-links {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .section-title {
    font-size: var(--font-size-3xl);
  }

  .modal-content {
    padding: var(--spacing-lg);
  }
}

/* プリント用スタイル */
@media print {
  .header,
  .hamburger,
  .theme-toggle,
  .modal {
    display: none !important;
  }

  body {
    background: white !important;
    color: black !important;
  }

  .hero-background {
    display: none;
  }
}

/* 高コントラストモード対応 */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000000;
    --shadow-color: rgba(0, 0, 0, 0.5);
  }

  .dark-theme {
    --border-color: #ffffff;
    --shadow-color: rgba(255, 255, 255, 0.3);
  }
}

/* 動きを減らす設定 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* フォーカス表示の改善 */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* スクロールバーのスタイリング */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* 選択テキストのスタイル */
::selection {
  background: rgba(99, 102, 241, 0.2);
  color: var(--text-primary);
}

/* ガラス効果 */
.glass-effect {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.dark-theme .glass-effect {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}