/* Google Fontsの読み込み用スタイル */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&family=Orbitron:wght@400;500;600;700;800;900&display=swap');

:root {
  --primary-color: #ff89a4;
  --secondary-color: #ffd6e0;
  --text-color: #333;
  --background-color: #fafafa;
  --card-background: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --overlay-background: rgb(33 33 33 / 32%);
  --gradient-start: #ff89a4;  /* ピンク */
  --gradient-middle: #9b6b9e; /* 紫 */
  --gradient-end: #4CAF50;    /* 緑 */
  --gradient-1: #ff7993; /* 桜色 - より鮮やか */
  --gradient-2: #36c9ff; /* 水色 */
  --gradient-3: #9b6b9e; /* 紫色 */
  --gradient-4: #4CAF50; /* 緑色 */
  --header-bg: #1a1a1a;
  --header-text: #ffffff;
  --header-subtext: rgba(255, 255, 255, 0.7);
  
  /* グループ別カラーテーマ */
  --nogizaka-primary: #9b6b9e;    /* 紫色 */
  --nogizaka-secondary: #d1c4e9;  /* 薄い紫 */
  --sakurazaka-primary: #ff7993;  /* 桜色 */
  --sakurazaka-secondary: #ffb3c1; /* 薄い桜色 */
  --hinatazaka-primary: #36c9ff;  /* 水色 */
  --hinatazaka-secondary: #b3e5fc; /* 薄い水色 */
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

main {
  position: relative;
  min-height: 70vh;
}

header {
  background: var(--header-bg);
  color: var(--header-text);
  padding: 2.5rem 0 1.5rem;
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

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

/* グラデーション水平線 */
header::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 4rem);
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--gradient-1),
    var(--gradient-2),
    var(--gradient-3),
    var(--gradient-4),
    var(--gradient-1)
  );
  background-size: 300% 100%;
  animation: gradientFlow 12s linear infinite;
}

header h1 {
  font-family: 'Orbitron', monospace;
  font-size: 2.5rem;
  margin-bottom: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--header-text);
}

header p {
  font-family: 'Orbitron', monospace;
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--header-subtext);
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

/* Disclaimer Popup Styles */
.disclaimer-popup {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  font-family: 'Noto Sans JP', sans-serif;
  max-width: 320px;
  animation: slideInUp 0.5s ease-out;
}

.disclaimer-content {
  background: rgba(0, 0, 0, 0.9);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 12px;
  padding: 16px 20px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  position: relative;
}

.disclaimer-content p {
  font-size: 0.65em;
  color: rgb(184, 184, 184);
  line-height: 1.5;
  margin: 0;
  letter-spacing: 0.01em;
  font-weight: 300;
}

/* PC用のスタイル（768px以上） */
@media (min-width: 769px) {
  .disclaimer-popup {
    bottom: 20px;
    right: 20px;
    left: auto;
    width: auto;
    max-width: 320px;
  }
  
  .disclaimer-content {
    padding: 16px 20px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.9);
  }
  
  .disclaimer-content p {
    font-size: 0.65em;
    line-height: 1.5;
  }
  
  .disclaimer-close {
    top: 8px;
    right: 12px;
    transform: none;
    font-size: 20px;
  }
}

.disclaimer-close {
  position: absolute;
  top: 8px;
  right: 12px;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.6);
  font-size: 20px;
  cursor: pointer;
  padding: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.disclaimer-close:hover {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.9);
}

@keyframes slideInUp {
  from {
    transform: translateY(100px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@keyframes slideOutDown {
  from {
    transform: translateY(0);
    opacity: 1;
  }
  to {
    transform: translateY(100px);
    opacity: 0;
  }
}

.group-toggle-buttons {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.group-toggle-btn {
  background-color: transparent;
  color: rgba(255, 255, 255, 0.7);
  border: none;
  padding: 0.7rem 1.5rem;
  border-radius: 25px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
  z-index: 1;
}

.group-toggle-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 25px;
  padding: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    transparent
  );
  background-size: 300% 100%;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
  transition: all 0.3s ease;
}

.group-toggle-btn:hover {
  color: var(--header-text);
  background-color: var(--header-bg);
}

.group-toggle-btn.active {
  color: var(--header-text);
  background-color: var(--header-bg);
  font-weight: 600;
}

.group-toggle-btn.active::before {
  background: linear-gradient(
    90deg,
    var(--gradient-1),
    var(--gradient-2),
    var(--gradient-3),
    var(--gradient-4),
    var(--gradient-1)
  );
  background-size: 300% 100%;
  animation: gradientFlow 12s linear infinite;
}

.controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 1rem;
  padding: 0;
  max-width: 1200px;
  margin: 0 auto;
}

/* 共通のボタンスタイル */
.gradient-border {
  background-color: var(--header-bg);
  color: var(--header-text);
  border: none;
  padding: 0.6rem 2rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
  z-index: 1;
}

/* 共通のグラデーション境界線 */
.gradient-border::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 6px;
  padding: 1px;
  background: linear-gradient(
    90deg,
    var(--gradient-1),
    var(--gradient-2),
    var(--gradient-3),
    var(--gradient-4),
    var(--gradient-1)
  );
  background-size: 300% 100%;
  animation: gradientFlow 12s linear infinite;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
}

.gradient-border:hover {
  background-color: var(--header-bg);
}


/* ソートセレクト */
#sortSelect {
  background-color: var(--header-bg);
  color: var(--header-text);
  border: none;
  padding: 0.6rem 3rem 0.6rem 2rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
  z-index: 1;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1em;
}

#sortSelect::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  border-radius: 6px;
  padding: 1px;
  background: linear-gradient(
    90deg,
    var(--gradient-1),
    var(--gradient-2),
    var(--gradient-3),
    var(--gradient-4),
    var(--gradient-1)
  );
  background-size: 300% 100%;
  animation: gradientFlow 12s linear infinite;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  -webkit-mask-composite: xor;
}

#sortSelect:hover {
  background-color: var(--header-bg);
}

#sortSelect option {
  background-color: var(--header-bg);
  color: var(--header-text);
  padding: 8px;
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

.tweet-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  padding: 0;
  max-width: 1400px;
  margin: 0 auto;
  background-color: #1a1a1a;
  transition: all 0.4s linear;
}

.tweet-card {
  background: var(--card-background);
  overflow: hidden;
  position: relative;
  aspect-ratio: 16/9;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  margin-bottom: 0 !important;
  z-index: 0;
  transform-origin: center center;
  opacity: 0;
}

.tweet-card.loaded {
  animation: fadeInCard 0.15s linear forwards;
}

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

.tweet-card:hover:not(.expanded) {
  transform: scale(1.05);
  z-index: 1;
}

.tweet-card.expanded {
  grid-column: 1 / -1;
  aspect-ratio: unset;
  min-height: 340px;
  max-height: 600px;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  position: relative;
  z-index: 10;
  box-shadow: 0 8px 32px rgba(0,0,0,0.18);
  opacity: 0;
  animation: fadeDetailView 0.4s linear 0.4s forwards;
}

@keyframes fadeDetailView {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.expanded-images-area {
  flex: 0 0 50%;
  width: 50%;
  height: 100%;
  background: #000;
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.expanded-images-inner {
  display: flex;
  align-items: center;
  height: 320px;
  width: max-content;
  transition: transform 0.7s cubic-bezier(.4,2,.6,1);
}

.tweet-card.expanded .tweet-images {
  flex: 0 0 50%;
  height: 100%;
  min-width: 0;
  max-width: none;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
}

.tweet-card.expanded .tweet-image {
  position: relative;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 0;
  background: #000;
}

.tweet-detail-area {
  display: none;
  flex: 1 1 50%;
  background: #18181c;
  padding: 2.2rem 2.2rem 2.2rem 1.5rem;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  animation: fadeInDetail 0.35s cubic-bezier(.4,2,.6,1);
  font-family: 'Noto Sans JP', sans-serif;
  color: #f5f5f7;
  overflow-y: auto;
  box-shadow: -2px 0 16px rgba(0,0,0,0.18);
}

.tweet-card.expanded .tweet-detail-area {
  display: flex;
}

.tweet-detail-area .member-info {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 0.7rem;
  opacity: 0;
  animation: fadeInElement 0.4s linear 0.6s forwards;
}

.tweet-detail-area .member-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: #ff89a4;
  letter-spacing: 0.04em;
}

.tweet-detail-area .tweet-date {
  font-size: 0.95rem;
  color: #aaa;
}

.tweet-detail-area .blog-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.1rem;
  color: #fff;
  letter-spacing: 0.03em;
  text-shadow: 0 2px 8px rgba(0,0,0,0.18);
  opacity: 0;
  animation: fadeInElement 0.4s linear 0.6s forwards;
}

.tweet-detail-area .ai-text {
  font-size: 1.13rem;
  color: #f5f5f7;
  margin-bottom: 1.8rem;
  line-height: 1.8;
  white-space: pre-line;
  letter-spacing: 0.01em;
  text-shadow: 0 1px 4px rgba(0,0,0,0.12);
  opacity: 1;
}

.tweet-detail-area .ai-text .text-line {
  display: block;
  opacity: 0;
  animation: fadeInLine 0.4s ease-out forwards;
}

@keyframes fadeInLine {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.tweet-detail-area .tweet-footer {
  display: flex;
  gap: 2.2rem;
  margin-top: 1.5rem;
  margin-bottom: 0.8rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  opacity: 0;
  animation: fadeInElement 0.4s linear forwards;
  justify-content: flex-end;
}

.tweet-detail-area .blog-link, 
.tweet-detail-area .share-link-btn {
  color: #ff89a4;
  font-weight: 600;
  text-decoration: none;
  font-size: 1.13rem;
  transition: all 0.2s;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  gap: 0.5em;
  background: rgba(255,255,255,0.06);
  padding: 0.5em 1.1em;
  border-radius: 1.5em;
  box-shadow: 0 1px 4px rgba(0,0,0,0.10);
  border: none;
  cursor: pointer;
  font-family: inherit;
}

.x-logo {
  width: 1em;
  height: 1em;
  transition: filter 0.2s;
}

.tweet-detail-area .blog-link:hover, 
.tweet-detail-area .share-link-btn:hover {
  color: #fff;
  background: #ff89a4;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(255, 137, 164, 0.3);
}

.tweet-detail-area .share-link-btn:hover .x-logo {
  filter: brightness(0) saturate(100%) invert(100%);
}

/* コピー成功メッセージのスタイルは削除（Twitter シェアでは不要） */

@keyframes fadeInDetail {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: none; }
}

@keyframes fadeInElement {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 通常タイルの画像・オーバーレイ */
.tweet-card .tweet-detail-area {
  display: none;
}

.tweet-card .tweet-images {
  width: 100%;
  height: 100%;
  position: relative;
  aspect-ratio: 16/9;
  display: block;
}

.tweet-card.expanded .image-overlay {
  font-size: 1.1rem;
  padding: 16px 24px;
}

.tweet-card.expanded .blog-title {
  font-size: 1.2rem;
}

.tweet-card.expanded .member-name {
  font-size: 1.05rem;
}

/* グリッドの上下ずれアニメーション - 一時的に無効化 */
.tweet-card {
  /* transition: transform 0.3s cubic-bezier(.4,2,.6,1); */
}

.tweet-images {
  position: relative;
  width: 100%;
  height: 100%;
  background-color: #f0f0f0;
  overflow: hidden;
  cursor: pointer;
}

/* タイトルオーバーレイ */
.image-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--overlay-background);
  backdrop-filter: blur(3px);
  padding: 8px 16px;
  color: white;
  font-family: 'Noto Sans JP', sans-serif;
  display: flex;
  align-items: center;
  gap: 8px;
}

.image-overlay .blog-title {
  font-size: 0.9rem;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  letter-spacing: 0.02em;
  margin: 0;
}

.image-overlay .member-name {
  font-size: 0.85rem;
  font-weight: 300;
  opacity: 0.9;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.tweet-images.multiple-images {
  display: grid;
  gap: 1px;
  background-color: #000;
  position: relative;
}

/* 複数画像時の全体オーバーレイ */
.tweet-images.multiple-images .image-overlay.main-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
}

/* 2枚の場合のレイアウト */
.tweet-images.multiple-images[data-image-count="2"] {
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr;
}

/* 3枚以上の場合のレイアウト */
.tweet-images.multiple-images[data-image-count="3"],
.tweet-images.multiple-images[data-image-count="4"] {
  grid-template-columns: 2fr 1fr;
  grid-template-rows: 1fr 1fr;
}

.tweet-images.multiple-images .image-wrapper {
  position: relative;
  overflow: hidden;
}

/* 3枚以上の場合の最初の画像のスタイル */
.tweet-images.multiple-images[data-image-count="3"] .image-wrapper:first-child,
.tweet-images.multiple-images[data-image-count="4"] .image-wrapper:first-child {
  grid-row: 1 / span 2;
}

/* 残り画像数オーバーレイ */
.more-images-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  font-weight: 600;
  backdrop-filter: blur(2px);
  z-index: 2;
}

.image-wrapper.has-more {
  position: relative;
}

.image-wrapper.has-more::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 1;
}

/* マージン問題の修正 */
.tweet-card {
  margin: 0 !important;
  padding: 0 !important;
}

.tweet-card:not(.expanded) {
  margin: 0 !important;
  padding: 0 !important;
}

/* トランジション中もマージンを強制的にゼロに保つ */
.tweet-card,
.tweet-card:hover,
.tweet-card:focus,
.tweet-card:active {
  margin: 0 !important;
  padding: 0 !important;
}

.tweet-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* モーダル表示の調整 */
.modal-content img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  background-color: #f0f0f0;
}

.tweet-content {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background: var(--card-background);
  padding: 2rem;
  box-shadow: -2px 0 10px var(--shadow-color);
  transition: right 0.3s ease;
  z-index: 1000;
  overflow-y: auto;
}

.tweet-content.active {
  right: 0;
}

.content-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-color);
  padding: 0.5rem;
}

.content-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s;
  z-index: 999;
}

.content-overlay.active {
  opacity: 1;
  visibility: visible;
}

.tweet-content {
  padding: 1.5rem;
}

.member-info {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.member-name {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--primary-color);
}

.tweet-date {
  margin-left: auto;
  font-size: 0.9rem;
  color: #666;
}

.blog-title {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.ai-text {
  font-size: 0.95rem;
  color: #444;
  margin-bottom: 1rem;
  line-height: 1.6;
}

.tweet-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 1rem;
  padding-top: 1.3rem;
  border-top: 1px solid #eee;
}

.blog-link, .twitter-link {
  text-decoration: none;
  color: var(--primary-color);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.2s;
}

.blog-link:hover, .twitter-link:hover {
  color: #ff7090;
}


.error {
  text-align: center;
  padding: 2rem;
  color: #ff4444;
  display: none;
}

/* 画像が複数ある場合のインジケーター */
.image-indicator {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0, 0, 0, 0.6);
  color: white;
  padding: 0.2rem 0.5rem;
  border-radius: 12px;
  font-size: 0.8rem;
}

/* ローディングオーバーレイ */
.loading-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--background-color);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  transition: opacity 0.2s ease;
  min-height: 70vh;
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.loading-content {
  text-align: center;
  padding: 2rem;
  transform: translateY(-15vh);
}

@media (max-width: 768px) {
  .loading-content {
    transform: translateY(-25vh);
    padding: 1.5rem;
  }
}

.loading-text {
  font-size: 1.1rem;
  color: var(--text-color);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.progress-bar-wrapper {
  width: 200px;
  margin: 0 auto;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: #e0e0e0;
  border-radius: 2px;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.progress-bar-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(
    90deg,
    var(--gradient-1),
    var(--gradient-2),
    var(--gradient-3),
    var(--gradient-4),
    var(--gradient-1)
  );
  background-size: 300% 100%;
  animation: gradientFlow 2s linear infinite;
  transition: width 0.3s ease;
  position: relative;
  border-radius: 2px;
}

.progress-bar-fill::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 20px;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.6),
    transparent
  );
  animation: shimmer 1.5s ease-in-out infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-20px);
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    transform: translateX(20px);
    opacity: 0;
  }
}

/* レスポンシブデザイン */
@media (max-width: 1200px) {
  .tweet-grid {
    grid-template-columns: repeat(2, 1fr); /* タブレットサイズでは2列 */
  }
}

@media (max-width: 768px) {
  .tweet-grid {
    grid-template-columns: 1fr; /* モバイルサイズでは1列 */
  }

  header h1 {
    font-size: 2rem;
  }

  header p {
    font-size: 0.7rem;
  }

  /* モバイル用の帯表示 */
  .disclaimer-popup {
    bottom: 0;
    left: 0;
    right: 0;
    max-width: none;
    width: 100%;
  }
  
  .disclaimer-content {
    padding: 12px 40px 12px 16px;
    border-radius: 0;
    border: none;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(0, 0, 0, 0.95);
  }
  
  .disclaimer-content p {
    white-space: normal;
    display: block;
    animation: none;
    padding-left: 0;
    font-size: 0.6em;
    line-height: 1.4;
  }
  
  .disclaimer-close {
    top: 50%;
    right: 12px;
    transform: translateY(-50%);
    font-size: 18px;
    width: 24px;
    height: 24px;
  }

  .group-toggle-buttons {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .group-toggle-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.8rem;
  }

  .controls {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
  }

  .controls select {
    flex: 1;
    min-width: 100px;
    max-width: 150px;
    font-size: 0.8rem;
    padding: 0.5rem 1rem;
  }

  .tweet-images.multiple-images {
    gap: 1px;
  }

  .tweet-content {
    width: 100%;
    right: -100%;
  }

  /* モバイルでのexpanded表示を縦並びに変更 */
  .tweet-card.expanded {
    flex-direction: column !important;
    min-height: auto !important;
    max-height: none !important;
    display: flex !important;
  }

  /* モバイルでのexpanded時に元の画像エリアを非表示 */
  .tweet-card.expanded .tweet-images {
    display: none !important;
  }

  .tweet-card.expanded .expanded-images-area {
    flex: none !important;
    width: 100% !important;
    height: 40vh !important;
    min-height: 250px !important;
    max-height: 350px !important;
    flex-basis: auto !important;
    position: static !important;
    top: auto !important;
    left: auto !important;
    bottom: auto !important;
    z-index: 1 !important;
    order: 1 !important;
  }

  .tweet-card.expanded .tweet-detail-area {
    flex: none !important;
    width: 100% !important;
    padding: 1.5rem 1.5rem 1rem 1.5rem !important;
    max-height: none !important;
    min-height: auto !important;
    flex-basis: auto !important;
    position: relative !important;
    z-index: 1 !important;
    display: flex !important;
    flex-direction: column !important;
    order: 2 !important;
    overflow-y: auto !important;
  }

  .tweet-detail-area .blog-title {
    font-size: 1.2rem;
    margin-bottom: 0.8rem;
  }

  .tweet-detail-area .ai-text {
    font-size: 1rem;
    line-height: 1.6;
  }

  .tweet-detail-area .tweet-footer {
    gap: 1rem;
    margin-top: 0.6rem;
    margin-bottom: 0.1rem;
  }

  .tweet-detail-area .blog-link,
  .tweet-detail-area .share-link-btn {
    font-size: 0.9rem;
    padding: 0.4em 0.8em;
  }
}

/* ダークモードサポート */
@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #1a1a1a;
    --card-background: #2d2d2d;
    --text-color: #ffffff;
    --shadow-color: rgba(0, 0, 0, 0.3);
  }

  .tweet-card {
    border: 1px solid #333;
  }

  .ai-text {
    color: #ddd;
  }

  .tweet-date {
    color: #aaa;
  }

}

/* グループ別カラーテーマ */
.tweet-card[data-group="nogizaka46"] .tweet-detail-area .member-name,
.tweet-card[data-group="nogizaka46"] .member-name {
  color: var(--nogizaka-primary) !important;
}

.tweet-card[data-group="nogizaka46"] .tweet-detail-area .blog-link,
.tweet-card[data-group="nogizaka46"] .tweet-detail-area .share-link-btn {
  color: var(--nogizaka-primary) !important;
}

.tweet-card[data-group="nogizaka46"] .tweet-detail-area .blog-link:hover,
.tweet-card[data-group="nogizaka46"] .tweet-detail-area .share-link-btn:hover {
  background: var(--nogizaka-primary) !important;
  box-shadow: 0 4px 12px rgba(155, 107, 158, 0.3) !important;
}

.tweet-card[data-group="nogizaka46"] .tweet-detail-area .share-link-btn:hover .x-logo {
  filter: brightness(0) saturate(100%) invert(100%);
}

.tweet-card[data-group="sakurazaka46"] .tweet-detail-area .member-name,
.tweet-card[data-group="sakurazaka46"] .member-name {
  color: var(--sakurazaka-primary) !important;
}

.tweet-card[data-group="sakurazaka46"] .tweet-detail-area .blog-link,
.tweet-card[data-group="sakurazaka46"] .tweet-detail-area .share-link-btn {
  color: var(--sakurazaka-primary) !important;
}

.tweet-card[data-group="sakurazaka46"] .tweet-detail-area .blog-link:hover,
.tweet-card[data-group="sakurazaka46"] .tweet-detail-area .share-link-btn:hover {
  background: var(--sakurazaka-primary) !important;
  box-shadow: 0 4px 12px rgba(255, 121, 147, 0.3) !important;
}

.tweet-card[data-group="sakurazaka46"] .tweet-detail-area .share-link-btn:hover .x-logo {
  filter: brightness(0) saturate(100%) invert(100%);
}

.tweet-card[data-group="hinatazaka46"] .tweet-detail-area .member-name,
.tweet-card[data-group="hinatazaka46"] .member-name {
  color: var(--hinatazaka-primary) !important;
}

.tweet-card[data-group="hinatazaka46"] .tweet-detail-area .blog-link,
.tweet-card[data-group="hinatazaka46"] .tweet-detail-area .share-link-btn {
  color: var(--hinatazaka-primary) !important;
}

.tweet-card[data-group="hinatazaka46"] .tweet-detail-area .blog-link:hover,
.tweet-card[data-group="hinatazaka46"] .tweet-detail-area .share-link-btn:hover {
  background: var(--hinatazaka-primary) !important;
  box-shadow: 0 4px 12px rgba(54, 201, 255, 0.3) !important;
}

.tweet-card[data-group="hinatazaka46"] .tweet-detail-area .share-link-btn:hover .x-logo {
  filter: brightness(0) saturate(100%) invert(100%);
}

/* タイルオーバーレイのメンバー名にもグループカラーを適用 */
.tweet-card[data-group="nogizaka46"] .image-overlay .member-name {
  color: var(--nogizaka-primary) !important;
}

.tweet-card[data-group="sakurazaka46"] .image-overlay .member-name {
  color: var(--sakurazaka-primary) !important;
}

.tweet-card[data-group="hinatazaka46"] .image-overlay .member-name {
  color: var(--hinatazaka-primary) !important;
}