:root {
  --bg-color: #fff0f5;
  --primary-color: #ffb6c1;
  --primary-dark: #ff9db0;
  --secondary-color: #add8e6;
  --note-color: #b19cd9;
  --text-color: #5c4a4f;
  --white: #ffffff;
}

body {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 20px;
  display: flex;
  justify-content: center;
}

.container {
  max-width: 500px;
  width: 100%;
}

/* ヘッダー＆タブ */
.header { text-align: center; margin-bottom: 20px; }
.header h1 { font-size: 1.6rem; color: var(--primary-dark); margin: 0; }
.header p { font-size: 0.9rem; margin-top: 5px; color: #887a7e; }

.tabs { display: flex; gap: 8px; margin-bottom: 20px; }
.tab-btn {
  flex: 1; background: var(--white); border: 2px solid var(--primary-color);
  color: var(--primary-color); padding: 10px 5px; border-radius: 20px;
  cursor: pointer; font-weight: bold; font-family: inherit; transition: 0.3s;
  font-size: 0.82rem; display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.tab-btn i { font-size: 1.1rem; }
.tab-btn.active { background: var(--primary-color); color: var(--white); }

/* カード共通 */
.card {
  background: var(--white); padding: 25px; border-radius: 20px;
  box-shadow: 0 8px 20px rgba(255, 182, 193, 0.25);
  display: none;
}
.card.active { display: block; animation: fadeIn 0.4s; }

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

/* ステップ */
.step { display: none; }
.step.active { display: block; animation: fadeIn 0.3s; }
.step-title {
  font-size: 1.1rem; color: var(--primary-dark);
  margin-bottom: 15px; border-bottom: 2px dashed #f0ecf4; padding-bottom: 10px;
  font-weight: bold;
}

/* フォーム共通 */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-weight: bold; margin-bottom: 6px; font-size: 0.9rem; }

/* 選択肢ボタン */
.choice-grid { display: flex; flex-direction: column; gap: 10px; }
.choice-label {
  display: flex; align-items: center; gap: 10px; padding: 12px 15px;
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px;
  cursor: pointer; transition: 0.2s; font-weight: bold;
}
.choice-label:hover { border-color: var(--primary-color); }
.choice-label:has(input:checked) {
  background: #fff5f7; border-color: var(--primary-color);
}
.choice-label input { display: none; }
.choice-icon { font-size: 1.2rem; width: 30px; text-align: center; }

/* 入力エリア */
textarea, input[type="text"], input[type="password"], input[type="email"] {
  width: 100%; padding: 12px; border: 2px solid #f0ecf4;
  border-radius: 12px; box-sizing: border-box; font-family: inherit; font-size: 0.95rem;
  transition: 0.3s;
}
textarea:focus, input:focus { outline: none; border-color: var(--primary-color); }
textarea { min-height: 120px; resize: vertical; }

/* ボタンエリア */
.nav-buttons { display: flex; gap: 10px; margin-top: 20px; }
.btn {
  flex: 1; padding: 15px; border: none; border-radius: 20px;
  font-size: 1rem; font-weight: bold; font-family: inherit; cursor: pointer;
  transition: 0.2s; box-shadow: 0 4px 0 rgba(0,0,0,0.1);
}
.btn:active { transform: translateY(4px); box-shadow: none; }
.btn-next { background: var(--primary-color); color: var(--white); }
.btn-back { background: #f0ecf4; color: #887a7e; }
.btn-secondary { background: var(--secondary-color); box-shadow: 0 4px 0 #8cbdd0; }

.hint-text { font-size: 0.82rem; color: #887a7e; margin-bottom: 8px; display: block; line-height: 1.4; }
.hidden-option { display: none !important; }

/* お部屋番号の表示 & コピー */
.copy-container {
  display: flex; align-items: center; justify-content: center; gap: 10px; margin: 15px 0;
}
.id-box {
  background: #fdfafb; border: 2px dashed var(--primary-color); padding: 15px;
  text-align: center; border-radius: 15px; font-size: 1.5rem; flex: 1;
  font-weight: bold; color: var(--primary-dark); letter-spacing: 2px;
}
.btn-copy {
  background: var(--secondary-color); color: white; border: none; padding: 18px 15px;
  border-radius: 15px; font-family: inherit; font-weight: bold; cursor: pointer;
  transition: 0.2s; font-size: 0.9rem; box-shadow: 0 4px 0 #8cbdd0;
}
.btn-copy:active { transform: translateY(4px); box-shadow: none; }

/* トースト通知 */
.toast-container {
  position: fixed; bottom: 20px; right: 20px; left: 20px;
  max-width: 400px; margin: 0 auto; z-index: 9999;
  display: flex; flex-direction: column; gap: 10px; pointer-events: none;
}
.toast {
  background: var(--white); color: var(--text-color);
  padding: 15px 20px; border-radius: 15px; font-weight: bold;
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  display: flex; align-items: center; gap: 10px;
  pointer-events: auto; animation: slideUp 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
  border-left: 6px solid var(--primary-color);
}
.toast.success { border-left-color: #8ce1a7; }
.toast.info { border-left-color: var(--secondary-color); }
.toast.error { border-left-color: #ff9494; }

@keyframes slideUp {
  from { transform: translateY(100%) scale(0.9); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}
.toast.fade-out { animation: fadeOut 0.4s forwards; }
@keyframes fadeOut { to { transform: scale(0.9); opacity: 0; } }

/* 📊 アンケートUI */
.survey-tabs { display: flex; border-bottom: 2px solid #f0ecf4; margin-bottom: 15px; }
.survey-tab-btn {
  flex: 1; background: none; border: none; padding: 10px; font-family: inherit;
  font-weight: bold; color: #887a7e; cursor: pointer; border-bottom: 3px solid transparent;
}
.survey-tab-btn.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }
.survey-sub-content { display: none; }
.survey-sub-content.active { display: block; }

.btn-add-opt {
  background: none; border: 2px dashed var(--secondary-color); color: var(--secondary-color);
  padding: 8px; border-radius: 10px; width: 100%; font-family: inherit; font-weight: bold;
  cursor: pointer; margin-bottom: 15px; transition: 0.2s;
}
.btn-add-opt:hover { background: #f4fafd; }

/* 投票項目カード */
.survey-card {
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 18px;
  padding: 18px; margin-bottom: 15px; position: relative;
}
.survey-card h4 { margin: 0 0 12px 0; font-size: 1rem; color: var(--text-color); }

/* 投票前の選択ボタン */
.survey-vote-option-label {
  display: block; margin-bottom: 8px; padding: 10px 12px;
  border: 2px solid #f0ecf4; background: white; border-radius: 10px;
  cursor: pointer; font-size: 0.88rem; transition: 0.2s;
}
.survey-vote-option-label:hover { border-color: var(--primary-color); }
.survey-vote-option-label input { margin-right: 8px; accent-color: var(--primary-color); }

/* 投票後の結果バー */
.survey-bar-bg {
  background: #f0ecf4; height: 35px; border-radius: 10px; overflow: hidden; position: relative; margin-bottom: 8px;
}
.survey-bar-fill {
  background: #ffe3e7; width: 0%; height: 100%; transition: width 0.6s ease-out;
}
.survey-opt-text {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  font-size: 0.88rem; font-weight: bold; z-index: 2; display: flex; justify-content: space-between; width: calc(100% - 24px);
}

.survey-share-btn {
  background: none; border: none; color: var(--secondary-color); cursor: pointer;
  font-size: 0.85rem; font-weight: bold; float: right; margin-top: 10px; display: flex; align-items: center; gap: 4px;
}

/* 📢 掲示板 */
.board-posts-list { display: flex; flex-direction: column; gap: 15px; }
.board-post {
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 18px;
  padding: 15px; animation: fadeIn 0.3s;
}
.board-post-header {
  display: flex; justify-content: space-between; font-size: 0.8rem; color: #887a7e; margin-bottom: 8px; align-items: center;
}
.board-post-body {
  font-size: 0.93rem; line-height: 1.5; white-space: pre-wrap; margin-bottom: 10px;
}
.btn-delete {
  background: none; border: none; color: #ff9494; cursor: pointer; font-size: 0.95rem; padding: 2px 8px;
  transition: 0.2s;
}
.btn-delete:hover { color: #ff5e5e; transform: scale(1.1); }

/* スレッド内の返信リスト */
.replies-container {
  background: #ffffff; border-radius: 12px; padding: 10px; margin-top: 10px;
  border: 1px dashed #e0e0e0; display: flex; flex-direction: column; gap: 8px;
}
.reply-item {
  border-bottom: 1px solid #f4f4f4; padding-bottom: 8px;
}
.reply-item:last-child { border-bottom: none; padding-bottom: 0; }
.reply-header {
  display: flex; justify-content: space-between; font-size: 0.75rem; color: #999; margin-bottom: 4px; align-items: center;
}
.reply-body { font-size: 0.85rem; line-height: 1.4; white-space: pre-wrap; }

/* 返信投稿フォーム */
.reply-form { display: flex; gap: 6px; margin-top: 10px; }
.reply-form input { flex: 1; padding: 8px 12px; border: 1px solid #f0ecf4; border-radius: 10px; font-size: 0.85rem; }
.btn-reply-send {
  background: var(--note-color); color: white; border: none; border-radius: 10px;
  padding: 8px 12px; font-size: 0.8rem; font-weight: bold; cursor: pointer; transition: 0.2s;
}
.btn-reply-send:hover { background: #967fbf; }

/* 🚪 自作の確認モーダル */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.45); display: none; align-items: center; justify-content: center;
  z-index: 10000; backdrop-filter: blur(2px);
}
.modal-overlay.active { display: flex; animation: fadeIn 0.2s forwards; }
.modal-card {
  background: var(--white); padding: 25px; border-radius: 25px; width: 85%; max-width: 350px;
  box-shadow: 0 15px 35px rgba(0,0,0,0.15); text-align: center; border: 3px solid var(--primary-color);
  animation: scaleUp 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
}
@keyframes scaleUp {
  from { transform: scale(0.85); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}
.modal-card h3 { margin: 0 0 10px 0; font-size: 1.2rem; }
.modal-card p { font-size: 0.9rem; margin-bottom: 20px; line-height: 1.5; color: #7c6c70; }

/* チャットウィンドウ */
.chat-window {
  height: 300px; background: #f4f8fa; border-radius: 15px;
  padding: 15px; overflow-y: auto; margin-bottom: 15px;
  display: flex; flex-direction: column; gap: 15px;
}
.chat-bubble { max-width: 80%; padding: 12px 15px; border-radius: 20px; font-size: 0.95rem; line-height: 1.5; }
.chat-bubble.them { align-self: flex-start; background: var(--white); border: 1px solid #e0e0e0; border-bottom-left-radius: 5px; }
.chat-bubble.me { align-self: flex-end; background: var(--primary-color); color: var(--white); border-bottom-right-radius: 5px; }
.chat-input-area { display: flex; gap: 10px; }
.chat-input-area input { flex: 1; padding: 10px 15px; border: 2px solid #f0ecf4; border-radius: 20px; font-family: inherit; }
.chat-input-area button { background: var(--primary-color); border: none; color: white; width: 45px; height: 45px; border-radius: 50%; cursor: pointer; }

:root {
  --bg-color: #fff0f5;
  --primary-color: #ffb6c1;
  --primary-dark: #ff9db0;
  --secondary-color: #add8e6;
  --note-color: #b19cd9;
  --text-color: #5c4a4f;
  --white: #ffffff;
}

/* レスポンシブを意識した基本設定 */
html, body {
  width: 100%;
  box-sizing: border-box;
}

body {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 15px; /* スマホ時の外側余白を少し狭めに */
  display: flex;
  justify-content: center;
}

.container {
  max-width: 500px;
  width: 100%;
}

/* ヘッダー＆タブ */
.header { text-align: center; margin-bottom: 20px; }
.header h1 { font-size: 1.5rem; color: var(--primary-dark); margin: 0; }
.header p { font-size: 0.85rem; margin-top: 5px; color: #887a7e; }

.tabs { display: flex; gap: 6px; margin-bottom: 20px; }
.tab-btn {
  flex: 1; background: var(--white); border: 2px solid var(--primary-color);
  color: var(--primary-color); padding: 8px 3px; border-radius: 18px;
  cursor: pointer; font-weight: bold; font-family: inherit; transition: 0.3s;
  font-size: 0.78rem; display: flex; flex-direction: column; align-items: center; gap: 3px;
}
.tab-btn i { font-size: 1rem; }
.tab-btn.active { background: var(--primary-color); color: var(--white); }

/* カード共通 */
.card {
  background: var(--white); padding: 20px; border-radius: 20px;
  box-shadow: 0 8px 20px rgba(255, 182, 193, 0.25);
  display: none;
  box-sizing: border-box;
}
.card.active { display: block; animation: fadeIn 0.4s; }

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

/* ステップ */
.step { display: none; }
.step.active { display: block; animation: fadeIn 0.3s; }
.step-title {
  font-size: 1rem; color: var(--primary-dark);
  margin-bottom: 12px; border-bottom: 2px dashed #f0ecf4; padding-bottom: 8px;
  font-weight: bold;
}

/* フォーム共通 */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-weight: bold; margin-bottom: 6px; font-size: 0.85rem; }

/* 選択肢ボタン */
.choice-grid { display: flex; flex-direction: column; gap: 8px; }
.choice-label {
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 12px;
  cursor: pointer; transition: 0.2s; font-weight: bold; font-size: 0.88rem;
}
.choice-label:hover { border-color: var(--primary-color); }
.choice-label:has(input:checked) {
  background: #fff5f7; border-color: var(--primary-color);
}
.choice-label input { display: none; }
.choice-icon { font-size: 1.1rem; width: 25px; text-align: center; }

/* 入力エリア */
textarea, input[type="text"], input[type="password"], input[type="email"] {
  width: 100%; padding: 10px 12px; border: 2px solid #f0ecf4;
  border-radius: 10px; box-sizing: border-box; font-family: inherit; font-size: 0.9rem;
  transition: 0.3s;
}
textarea:focus, input:focus { outline: none; border-color: var(--primary-color); }
textarea { min-height: 100px; resize: vertical; }

/* ボタンエリア */
.nav-buttons { display: flex; gap: 8px; margin-top: 15px; }
.btn {
  flex: 1; padding: 12px; border: none; border-radius: 18px;
  font-size: 0.9rem; font-weight: bold; font-family: inherit; cursor: pointer;
  transition: 0.2s; box-shadow: 0 4px 0 rgba(0,0,0,0.1);
}
.btn:active { transform: translateY(4px); box-shadow: none; }
.btn-next { background: var(--primary-color); color: var(--white); }
.btn-back { background: #f0ecf4; color: #887a7e; }
.btn-secondary { background: var(--secondary-color); box-shadow: 0 4px 0 #8cbdd0; }

.hint-text { font-size: 0.78rem; color: #887a7e; margin-bottom: 6px; display: block; line-height: 1.3; }
.hidden-option { display: none !important; }

/* お部屋番号の表示 & コピー */
.copy-container {
  display: flex; align-items: center; justify-content: center; gap: 8px; margin: 15px 0; width: 100%;
}
.id-box {
  background: #fdfafb; border: 2px dashed var(--primary-color); padding: 12px;
  text-align: center; border-radius: 12px; font-size: 1.25rem; flex: 1;
  font-weight: bold; color: var(--primary-dark); letter-spacing: 2px;
}
.btn-copy {
  background: var(--secondary-color); color: white; border: none; padding: 14px 12px;
  border-radius: 12px; font-family: inherit; font-weight: bold; cursor: pointer;
  transition: 0.2s; font-size: 0.82rem; box-shadow: 0 4px 0 #8cbdd0;
}
.btn-copy:active { transform: translateY(4px); box-shadow: none; }

/* トースト通知 */
.toast-container {
  position: fixed; bottom: 15px; right: 15px; left: 15px;
  max-width: 400px; margin: 0 auto; z-index: 9999;
  display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  background: var(--white); color: var(--text-color);
  padding: 12px 15px; border-radius: 12px; font-weight: bold; font-size: 0.85rem;
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  display: flex; align-items: center; gap: 8px;
  pointer-events: auto; animation: slideUp 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
  border-left: 5px solid var(--primary-color);
}
.toast.success { border-left-color: #8ce1a7; }
.toast.info { border-left-color: var(--secondary-color); }
.toast.error { border-left-color: #ff9494; }

@keyframes slideUp {
  from { transform: translateY(100%) scale(0.95); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}
.toast.fade-out { animation: fadeOut 0.4s forwards; }
@keyframes fadeOut { to { transform: scale(0.95); opacity: 0; } }

/* 📊 アンケートUI */
.survey-tabs { display: flex; border-bottom: 2px solid #f0ecf4; margin-bottom: 12px; }
.survey-tab-btn {
  flex: 1; background: none; border: none; padding: 8px; font-family: inherit;
  font-weight: bold; color: #887a7e; cursor: pointer; border-bottom: 3px solid transparent; font-size: 0.85rem;
}
.survey-tab-btn.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }
.survey-sub-content { display: none; }
.survey-sub-content.active { display: block; }

.btn-add-opt {
  background: none; border: 2px dashed var(--secondary-color); color: var(--secondary-color);
  padding: 8px; border-radius: 10px; width: 100%; font-family: inherit; font-weight: bold;
  cursor: pointer; margin-bottom: 15px; transition: 0.2s; font-size: 0.8rem;
}

/* 投票項目カード */
.survey-card {
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px;
  padding: 15px; margin-bottom: 12px; box-sizing: border-box;
}
.survey-card h4 { margin: 0 0 10px 0; font-size: 0.95rem; color: var(--text-color); }

/* 投票前の選択ボタン */
.survey-vote-option-label {
  display: block; margin-bottom: 6px; padding: 8px 10px;
  border: 2px solid #f0ecf4; background: white; border-radius: 10px;
  cursor: pointer; font-size: 0.82rem;
}
.survey-vote-option-label input { margin-right: 6px; }

/* 投票後の結果バー */
.survey-bar-bg {
  background: #f0ecf4; height: 32px; border-radius: 8px; overflow: hidden; position: relative; margin-bottom: 6px;
}
.survey-bar-fill { background: #ffe3e7; width: 0%; height: 100%; transition: width 0.6s ease-out; }
.survey-opt-text {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  font-size: 0.82rem; font-weight: bold; z-index: 2; display: flex; justify-content: space-between; width: calc(100% - 20px);
}

.survey-share-btn {
  background: none; border: none; color: var(--secondary-color); cursor: pointer;
  font-size: 0.8rem; font-weight: bold; float: right; margin-top: 5px; display: flex; align-items: center; gap: 3px;
}

/* 📢 掲示板 */
.board-posts-list { display: flex; flex-direction: column; gap: 12px; }
.board-post { background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px; padding: 12px; }
.board-post-header { display: flex; justify-content: space-between; font-size: 0.75rem; color: #887a7e; margin-bottom: 6px; }
.board-post-body { font-size: 0.88rem; line-height: 1.4; margin-bottom: 8px; }
.btn-delete { background: none; border: none; color: #ff9494; cursor: pointer; font-size: 0.85rem; padding: 2px 5px; }

.replies-container { background: #ffffff; border-radius: 10px; padding: 8px; margin-top: 8px; gap: 6px; }
.reply-item { border-bottom: 1px solid #f4f4f4; padding-bottom: 6px; }
.reply-header { display: flex; justify-content: space-between; font-size: 0.7rem; color: #999; }
.reply-body { font-size: 0.8rem; line-height: 1.3; }
.reply-form { display: flex; gap: 4px; margin-top: 8px; }
.reply-form input { padding: 6px 10px; font-size: 0.8rem; border-radius: 8px; }
.btn-reply-send { padding: 6px 10px; font-size: 0.75rem; border-radius: 8px; }

/* 🚪 自作の確認モーダル */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.45); display: none; align-items: center; justify-content: center;
  z-index: 10000; backdrop-filter: blur(2px);
}
.modal-overlay.active { display: flex; }
.modal-card {
  background: var(--white); padding: 20px; border-radius: 20px; width: 85%; max-width: 320px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.15); text-align: center; border: 3px solid var(--primary-color);
}
.modal-card h3 { font-size: 1.1rem; }
.modal-card p { font-size: 0.82rem; margin-bottom: 15px; }

/* 💬 チャットウィンドウ */
.chat-window { height: 260px; padding: 12px; margin-bottom: 12px; }
.chat-bubble { max-width: 85%; padding: 10px 12px; font-size: 0.88rem; }
.chat-input-area input { padding: 8px 12px; font-size: 0.85rem; }
.chat-input-area button { width: 40px; height: 40px; }

/* ⚙️ 管理者専用リスト */
.admin-item {
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px;
  padding: 12px; cursor: pointer; transition: 0.2s; position: relative;
}
.admin-item:hover { border-color: var(--note-color); background: #fbf9ff; }
.admin-item-header { display: flex; justify-content: space-between; font-size: 0.75rem; color:#887a7e; margin-bottom: 5px; }
.admin-item-title { font-weight: bold; font-size: 0.9rem; color: var(--text-color); }
.admin-item-preview { font-size: 0.82rem; color:#7c6c70; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 4px; }
.admin-badge {
  background: var(--note-color); color: white; padding: 2px 6px; border-radius: 8px; font-size: 0.65rem; font-weight: bold;
}
/* 返信投稿フォーム */
.reply-form { display: flex; gap: 6px; margin-top: 10px; align-items: flex-end; }
.reply-form textarea { 
  flex: 1; padding: 8px 12px; border: 1px solid #f0ecf4; border-radius: 10px; 
  font-size: 0.85rem; font-family: inherit; resize: vertical; min-height: 40px; 
}
.btn-reply-send {
  background: var(--note-color); color: white; border: none; border-radius: 10px;
  padding: 8px 12px; font-size: 0.8rem; font-weight: bold; cursor: pointer; transition: 0.2s;
  height: 40px; white-space: nowrap;
}
.btn-reply-send:hover { background: #967fbf; }
/* 📱 スマホ縦画面での微調整 (メディアクエリ) */
@media (max-width: 480px) {
  body { padding: 10px; }
  .card { padding: 15px; border-radius: 15px; }
  .tabs { gap: 4px; margin-bottom: 15px; }
  .tab-btn {
    padding: 6px 2px; border-radius: 12px; font-size: 0.68rem; gap: 2px;
  }
  .tab-btn i { font-size: 0.85rem; }
  .header h1 { font-size: 1.3rem; }
  .header p { font-size: 0.78rem; }
  .btn { padding: 10px; font-size: 0.85rem; border-radius: 15px; }
  .id-box { font-size: 1.15rem; padding: 10px; }
  .btn-copy { padding: 12px 10px; font-size: 0.78rem; border-radius: 10px; }
}

:root {
  --bg-color: #fff0f5;
  --primary-color: #ffb6c1;
  --primary-dark: #ff9db0;
  --secondary-color: #add8e6;
  --note-color: #b19cd9;
  --text-color: #5c4a4f;
  --white: #ffffff;
}

/* レスポンシブを意識した基本設定 */
html, body {
  width: 100%;
  box-sizing: border-box;
}

body {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 15px; 
  display: flex;
  justify-content: center;
}

.container {
  max-width: 500px;
  width: 100%;
}

/* ヘッダー＆タブ */
.header { text-align: center; margin-bottom: 20px; }
.header h1 { font-size: 1.5rem; color: var(--primary-dark); margin: 0; }
.header p { font-size: 0.85rem; margin-top: 5px; color: #887a7e; }

/* ⬇️ タブボタンのアニメーション強化 */
.tabs { display: flex; gap: 6px; margin-bottom: 20px; }
.tab-btn {
  flex: 1; background: var(--white); border: 2px solid var(--primary-color);
  color: var(--primary-color); padding: 8px 3px; border-radius: 18px;
  cursor: pointer; font-weight: bold; font-family: inherit; 
  transition: all 0.2s cubic-bezier(0.18, 0.89, 0.32, 1.28); /* ぷるんとする動き */
  font-size: 0.78rem; display: flex; flex-direction: column; align-items: center; gap: 3px;
}
.tab-btn i { font-size: 1rem; }
.tab-btn.active { background: var(--primary-color); color: var(--white); }
.tab-btn:active { transform: scale(0.92); } /* 押した時にキュッと縮む */

/* カード共通 */
.card {
  background: var(--white); padding: 20px; border-radius: 20px;
  box-shadow: 0 8px 20px rgba(255, 182, 193, 0.25);
  display: none;
  box-sizing: border-box;
}
.card.active { display: block; animation: fadeIn 0.4s; }

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

/* ステップ */
.step { display: none; }
.step.active { display: block; animation: fadeIn 0.3s; }
.step-title {
  font-size: 1rem; color: var(--primary-dark);
  margin-bottom: 12px; border-bottom: 2px dashed #f0ecf4; padding-bottom: 8px;
  font-weight: bold;
}

/* フォーム共通 */
.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-weight: bold; margin-bottom: 6px; font-size: 0.85rem; }

/* 選択肢ボタン */
.choice-grid { display: flex; flex-direction: column; gap: 8px; }
.choice-label {
  display: flex; align-items: center; gap: 8px; padding: 10px 12px;
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 12px;
  cursor: pointer; transition: all 0.2s; font-weight: bold; font-size: 0.88rem;
}
.choice-label:hover { border-color: var(--primary-color); }
.choice-label:has(input:checked) {
  background: #fff5f7; border-color: var(--primary-color);
}
.choice-label:active { transform: scale(0.98); } /* タップ時の沈み込み */
.choice-label input { display: none; }
.choice-icon { font-size: 1.1rem; width: 25px; text-align: center; }

/* 入力エリア */
textarea, input[type="text"], input[type="password"], input[type="email"] {
  width: 100%; padding: 10px 12px; border: 2px solid #f0ecf4;
  border-radius: 10px; box-sizing: border-box; font-family: inherit; font-size: 0.9rem;
  transition: 0.3s;
}
textarea:focus, input:focus { outline: none; border-color: var(--primary-color); }
textarea { min-height: 100px; resize: vertical; }

/* ⬇️ 次へボタン等のアニメーション強化 */
.nav-buttons { display: flex; gap: 8px; margin-top: 15px; }
.btn {
  flex: 1; padding: 12px; border: none; border-radius: 18px;
  font-size: 0.9rem; font-weight: bold; font-family: inherit; cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s, background-color 0.2s;
  box-shadow: 0 4px 0 rgba(0,0,0,0.1);
}
.btn:active { 
  transform: translateY(4px) scale(0.98); 
  box-shadow: 0 0 0 rgba(0,0,0,0) !important; /* 影を消して完全に沈む */
}
.btn-next { background: var(--primary-color); color: var(--white); }
.btn-back { background: #f0ecf4; color: #887a7e; }
.btn-secondary { background: var(--secondary-color); box-shadow: 0 4px 0 #8cbdd0; }

/* ⬇️ LINEボタン専用のスタイルとアニメーション */
.btn-line {
  background: #06c755; color: white; padding: 15px; border-radius: 18px; 
  text-align: center; font-weight: bold; margin-bottom: 15px; 
  box-shadow: 0 4px 0 #04a044; transition: transform 0.1s, box-shadow 0.1s;
}
.btn-line:active {
  transform: translateY(4px) scale(0.98);
  box-shadow: 0 0 0 transparent;
}

.hint-text { font-size: 0.78rem; color: #887a7e; margin-bottom: 6px; display: block; line-height: 1.3; }
.hidden-option { display: none !important; }

/* お部屋番号の表示 & コピー */
.copy-container {
  display: flex; align-items: center; justify-content: center; gap: 8px; margin: 15px 0; width: 100%;
}
.id-box {
  background: #fdfafb; border: 2px dashed var(--primary-color); padding: 12px;
  text-align: center; border-radius: 12px; font-size: 1.25rem; flex: 1;
  font-weight: bold; color: var(--primary-dark); letter-spacing: 2px;
}
.btn-copy {
  background: var(--secondary-color); color: white; border: none; padding: 14px 12px;
  border-radius: 12px; font-family: inherit; font-weight: bold; cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s; font-size: 0.82rem; box-shadow: 0 4px 0 #8cbdd0;
}
.btn-copy:active { transform: translateY(4px) scale(0.95); box-shadow: 0 0 0 transparent; }

/* トースト通知 */
.toast-container {
  position: fixed; bottom: 15px; right: 15px; left: 15px;
  max-width: 400px; margin: 0 auto; z-index: 9999;
  display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  background: var(--white); color: var(--text-color);
  padding: 12px 15px; border-radius: 12px; font-weight: bold; font-size: 0.85rem;
  box-shadow: 0 8px 20px rgba(0,0,0,0.12);
  display: flex; align-items: center; gap: 8px;
  pointer-events: auto; animation: slideUp 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
  border-left: 5px solid var(--primary-color);
}
.toast.success { border-left-color: #8ce1a7; }
.toast.info { border-left-color: var(--secondary-color); }
.toast.error { border-left-color: #ff9494; }

@keyframes slideUp {
  from { transform: translateY(100%) scale(0.95); opacity: 0; }
  to { transform: translateY(0) scale(1); opacity: 1; }
}
.toast.fade-out { animation: fadeOut 0.4s forwards; }
@keyframes fadeOut { to { transform: scale(0.95); opacity: 0; } }

/* 📊 アンケートUI */
.survey-tabs { display: flex; border-bottom: 2px solid #f0ecf4; margin-bottom: 12px; }
.survey-tab-btn {
  flex: 1; background: none; border: none; padding: 8px; font-family: inherit;
  font-weight: bold; color: #887a7e; cursor: pointer; border-bottom: 3px solid transparent; font-size: 0.85rem;
}
.survey-tab-btn.active { color: var(--primary-color); border-bottom-color: var(--primary-color); }
.survey-sub-content { display: none; }
.survey-sub-content.active { display: block; }

.btn-add-opt {
  background: none; border: 2px dashed var(--secondary-color); color: var(--secondary-color);
  padding: 8px; border-radius: 10px; width: 100%; font-family: inherit; font-weight: bold;
  cursor: pointer; margin-bottom: 15px; transition: all 0.2s; font-size: 0.8rem;
}
.btn-add-opt:active { transform: scale(0.95); }

/* 投票項目カード */
.survey-card {
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px;
  padding: 15px; margin-bottom: 12px; box-sizing: border-box;
}
.survey-card h4 { margin: 0 0 10px 0; font-size: 0.95rem; color: var(--text-color); }

/* 投票前の選択ボタン */
.survey-vote-option-label {
  display: block; margin-bottom: 6px; padding: 8px 10px;
  border: 2px solid #f0ecf4; background: white; border-radius: 10px;
  cursor: pointer; font-size: 0.82rem; transition: 0.2s;
}
.survey-vote-option-label:active { transform: scale(0.98); }
.survey-vote-option-label input { margin-right: 6px; }

/* 投票後の結果バー */
.survey-bar-bg {
  background: #f0ecf4; height: 32px; border-radius: 8px; overflow: hidden; position: relative; margin-bottom: 6px;
}
.survey-bar-fill { background: #ffe3e7; width: 0%; height: 100%; transition: width 0.6s ease-out; }
.survey-opt-text {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  font-size: 0.82rem; font-weight: bold; z-index: 2; display: flex; justify-content: space-between; width: calc(100% - 20px);
}

.survey-share-btn {
  background: none; border: none; color: var(--secondary-color); cursor: pointer;
  font-size: 0.8rem; font-weight: bold; float: right; margin-top: 5px; display: flex; align-items: center; gap: 3px;
  transition: 0.2s;
}
.survey-share-btn:active { transform: scale(0.9); }

/* 📢 掲示板 */
.board-posts-list { display: flex; flex-direction: column; gap: 12px; }
.board-post { background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px; padding: 12px; }
.board-post-header { display: flex; justify-content: space-between; font-size: 0.75rem; color: #887a7e; margin-bottom: 6px; }
.board-post-body { font-size: 0.88rem; line-height: 1.4; margin-bottom: 8px; }
.btn-delete { background: none; border: none; color: #ff9494; cursor: pointer; font-size: 0.85rem; padding: 2px 5px; }

.replies-container { background: #ffffff; border-radius: 10px; padding: 8px; margin-top: 8px; display:flex; flex-direction:column; gap: 6px; }
.reply-item { border-bottom: 1px solid #f4f4f4; padding-bottom: 6px; }
.reply-header { display: flex; justify-content: space-between; font-size: 0.7rem; color: #999; }
.reply-body { font-size: 0.8rem; line-height: 1.3; }

/* ⬇️ 返信投稿フォーム（改行・長文対応！） */
.reply-form { display: flex; gap: 6px; margin-top: 10px; align-items: flex-end; }
.reply-form textarea { 
  flex: 1; padding: 8px 12px; border: 1px solid #f0ecf4; border-radius: 10px; 
  font-size: 0.85rem; font-family: inherit; resize: vertical; min-height: 40px; 
}
.btn-reply-send {
  background: var(--note-color); color: white; border: none; border-radius: 10px;
  padding: 8px 12px; font-size: 0.8rem; font-weight: bold; cursor: pointer; transition: 0.2s;
  height: 40px; white-space: nowrap; box-shadow: 0 3px 0 #967fbf;
}
.btn-reply-send:active { transform: translateY(3px) scale(0.95); box-shadow: none; }

/* 🚪 自作の確認モーダル */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0, 0, 0, 0.45); display: none; align-items: center; justify-content: center;
  z-index: 10000; backdrop-filter: blur(2px);
}
.modal-overlay.active { display: flex; }
.modal-card {
  background: var(--white); padding: 20px; border-radius: 20px; width: 85%; max-width: 320px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.15); text-align: center; border: 3px solid var(--primary-color);
}
.modal-card h3 { font-size: 1.1rem; }
.modal-card p { font-size: 0.82rem; margin-bottom: 15px; }

/* 💬 チャットウィンドウ */
.chat-window { height: 260px; padding: 12px; margin-bottom: 12px; }
.chat-bubble { max-width: 85%; padding: 10px 12px; font-size: 0.88rem; }
.chat-input-area input { padding: 8px 12px; font-size: 0.85rem; }
.chat-input-area button { width: 40px; height: 40px; }

/* ⚙️ 管理者専用リスト */
.admin-item {
  background: #fdfafb; border: 2px solid #f0ecf4; border-radius: 15px;
  padding: 12px; cursor: pointer; transition: 0.2s; position: relative;
}
.admin-item:hover { border-color: var(--note-color); background: #fbf9ff; }
.admin-item-header { display: flex; justify-content: space-between; font-size: 0.75rem; color:#887a7e; margin-bottom: 5px; }
.admin-item-title { font-weight: bold; font-size: 0.9rem; color: var(--text-color); }
.admin-item-preview { font-size: 0.82rem; color:#7c6c70; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 4px; }
.admin-badge {
  background: var(--note-color); color: white; padding: 2px 6px; border-radius: 8px; font-size: 0.65rem; font-weight: bold;
}

/* 📱 スマホ縦画面での微調整 */
@media (max-width: 480px) {
  body { padding: 10px; }
  .card { padding: 15px; border-radius: 15px; }
  .tabs { gap: 4px; margin-bottom: 15px; }
  .tab-btn { padding: 6px 2px; border-radius: 12px; font-size: 0.68rem; gap: 2px; }
  .tab-btn i { font-size: 0.85rem; }
  .header h1 { font-size: 1.3rem; }
  .header p { font-size: 0.78rem; }
  .btn { padding: 10px; font-size: 0.85rem; border-radius: 15px; }
  .id-box { font-size: 1.15rem; padding: 10px; }
  .btn-copy { padding: 12px 10px; font-size: 0.78rem; border-radius: 10px; }
}
/* 💬 チャット入力エリア（textarea対応！） */
.chat-input-area { display: flex; gap: 8px; align-items: flex-end; }
.chat-input-area textarea { 
  flex: 1; padding: 10px 15px; border: 2px solid #f0ecf4; border-radius: 15px; 
  font-family: inherit; font-size: 0.9rem; resize: vertical; min-height: 42px; max-height: 120px;
  box-sizing: border-box;
}
.chat-input-area textarea:focus { outline: none; border-color: var(--primary-color); }

/* 送信ボタンの丸みとポコッと沈むアニメーション */
.chat-input-area button { 
  background: var(--primary-color); border: none; color: white; 
  width: 42px; height: 42px; border-radius: 50%; cursor: pointer;
  flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  transition: transform 0.1s; box-shadow: 0 3px 0 var(--primary-dark);
}
.chat-input-area button:active {
  transform: translateY(3px) scale(0.95);
  box-shadow: none;
}
/* 💬 チャット入力エリア（textarea対応！） */
.chat-input-area { display: flex; gap: 8px; align-items: flex-end; }
.chat-input-area textarea { 
  flex: 1; padding: 10px 15px; border: 2px solid #f0ecf4; border-radius: 15px; 
  font-family: inherit; font-size: 0.9rem; resize: vertical; min-height: 42px; max-height: 120px;
  box-sizing: border-box;
}
.chat-input-area textarea:focus { outline: none; border-color: var(--primary-color); }

/* 送信ボタンの丸みとポコッと沈むアニメーション */
.chat-input-area button { 
  background: var(--primary-color); border: none; color: white; 
  width: 42px; height: 42px; border-radius: 50%; cursor: pointer;
  flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  transition: transform 0.1s; box-shadow: 0 3px 0 var(--primary-dark);
}
.chat-input-area button:active {
  transform: translateY(3px) scale(0.95);
  box-shadow: none;
}