/* 全体のレイアウト */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Poppins', 'Arial', 'Noto Sans JP', sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #333;
}

/* Header Styles */
.header {
  text-align: center;
  color: #555;
}

.title {
  font-size: 2.5em;
  font-weight: 700;
  margin: 30px 0 30px 0;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
  animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  from { text-shadow: 2px 2px 4px rgba(0,0,0,0.3), 0 0 20px rgba(255,255,255,0.3); }
  to { text-shadow: 2px 2px 4px rgba(0,0,0,0.3), 0 0 30px rgba(255,255,255,0.6); }
}

.container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 20px;
  background: #fff;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  margin-bottom: 30px;
}

/* コントロール */
.controls {
  padding: 25px;
}

.color-settings {
  margin: 1.5rem 0;
  padding: 1rem;
  background: #f8f9fa;
  border-radius: 10px;
  border: 1px solid #e9ecef;
}

.color-settings h3 {
  margin: 0 0 1rem 0;
  font-size: 1.1rem;
  color: #495057;
  font-weight: 600;
}

.color-picker-group {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.color-picker {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.color-picker label {
  font-weight: 500;
  min-width: 60px;
}

.color-picker input[type="color"] {
  width: 40px;
  height: 40px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

.color-picker input[type="text"] {
  width: 100px;
  font-family: monospace;
}

.color-preset {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 5px;
}

.color-preset select {
  flex: 1;
  max-width: 200px;
}

/* アクションボタン */
.action-buttons {
  text-align: center;
  margin-top: 1.5rem;
}

.btn {
  padding: 12px 30px;
  border: none;
  border-radius: 8px;
  font-size: 1.1em;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  margin: 0 10px;
  text-decoration: none;
  display: inline-block;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: #fff;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #5a6fd8 0%, #6a4190 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.btn-success {
  background: #6c757d !important;
  color: #fff !important;
  border: none !important;
}

.btn-success:hover {
  background: #5a6268 !important;
  transform: translateY(-2px);
}

.btn-success:focus {
  background: #6c757d !important;
  box-shadow: 0 0 0 0.2rem rgba(108, 117, 125, 0.25) !important;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* 結果表示 */
.results {
  margin-top: 2rem;
  padding: 0 25px 25px;
  display: none; /* 初期状態では非表示 */
}

.results.visible {
  display: block; /* 画像生成後に表示 */
}

.results h2 {
  color: #495057;
  border-bottom: 2px solid #667eea;
  padding-bottom: 0.5rem;
  margin-bottom: 1rem;
}

.generated-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
  /* 大量の要素に対するパフォーマンス最適化 */
  contain: layout style;
  will-change: scroll-position;
}

.image-container {
  background: #f8f9fa;
  border-radius: 10px;
  padding: 1rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.image-container:hover {
  transform: translateY(-5px);
}

.image-container canvas {
  width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 0.5rem 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.image-container input {
  margin-bottom: 0.5rem;
}

.image-container a {
  display: inline-block;
  padding: 8px 16px;
  background: #e0e0e0;
  color: #333;
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.image-container a:hover {
  background: #d5d5d5;
  transform: translateY(-2px);
}

/* Footer Styles */
.content-footer {
  text-align: center;
  color: #666;
  max-width: 800px;
  margin-top: 20px;
}

.footer {
  background: #262626;
  margin-top: 100px;
  padding-top: 30px;
  text-align: center;
  width: 100%;
  margin-left: calc(-50vw + 50%);
  margin-right: calc(-50vw + 50%);
  box-sizing: border-box;
}

.description h3 {
  font-size: 1.8em;
  font-weight: 600;
  margin: 0 0 15px 0;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.description p {
  font-size: 1.1em;
  font-weight: 300;
  margin: 0 0 20px 0;
  opacity: 0.9;
}

.features {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
}

.feature {
  background: rgba(255,255,255,0.2);
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.9em;
  font-weight: 400;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.3);
  transition: all 0.3s ease;
}

.feature:hover {
  background: rgba(255,255,255,0.3);
  transform: translateY(-2px);
}

/* ソーシャルセクション */
.social-section {
  padding-top: 0;
  border-top: none;
}

.social-header {
  text-align: center;
  margin-top: 30px;
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #ccc;
  font-weight: 600;
  font-size: 1.2em;
  transition: all 0.3s ease;
  padding: 8px 16px;
  border-radius: 25px;
  backdrop-filter: blur(10px);
}

.brand-link:hover {
  transform: translateY(-2px);
}

.brand-icon {
  width: 60px;
}

.social-buttons {
  display: flex;
  justify-content: center;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 30px;
  border-radius: 5px;
  text-decoration: none;
  font-weight: 400;
  font-size: 0.95em;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
  background: rgba(225, 224, 224, 0.8);
  color: #fff;
}

.social-btn.twitter,
.social-btn.facebook,
.social-btn.line {
  background: #555;
}

.social-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0,0,0,0.4);
  background: rgba(190,190,190,0.9);
}

.social-btn .icon {
  width: 16px;
  height: 16px;
}

.social-btn .icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

/* コピーライトセクション */
.copyright-section {
  text-align: center;
  padding: 15px 20px;
  background-color: rgba(0, 0, 0, 0.2);
  color: #ccc;
  font-size: 0.9em;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 20px;
}

.copyright-link {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

.copyright-link:hover {
  color: #ddd;
  text-decoration: underline;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .title {
    font-size: 2rem;
  }
  
  .container {
    padding: 1rem;
    margin: 0 10px 1rem 10px;
  }
  
  .controls {
    padding: 15px;
  }
  
  .color-picker-group {
    flex-direction: column;
    gap: 1rem;
  }
  
  .generated-images {
    grid-template-columns: 1fr;
  }
  
  .btn {
    display: block;
    margin: 0.5rem auto;
    max-width: 200px;
  }

  .social-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .social-btn {
    width: 200px;
    justify-content: center;
  }
}