* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #f5f5f5; height: 100vh; display: flex; justify-content: center; align-items: center; }
.app { width: 100%; max-width: 420px; height: 100vh; background: #fff; display: flex; flex-direction: column; box-shadow: 0 0 20px rgba(0,0,0,0.1); position: relative; }
.hidden { display: none !important; }

.header { background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%); color: #fff; padding: 0 16px; display: flex; justify-content: space-between; align-items: center; min-height: 48px; }
.header-left { display: flex; align-items: center; gap: 8px; }
.header-left h2 { font-size: 18px; font-weight: 500; }
.icon-btn { background: none; border: none; color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; padding: 4px; border-radius: 50%; }
.icon-btn svg { width: 22px; height: 22px; stroke: #fff; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

#create-room-btn { visibility: hidden; }
#create-room-btn.visible { visibility: visible; }

.chat-list { flex: 1; overflow-y: auto; padding-bottom: 8px; }
.chat-item { padding: 14px 16px; border-bottom: 1px solid #f0f0f0; display: flex; align-items: center; cursor: pointer; }
.chat-item:active { background: #f9f9f9; }
.avatar { width: 44px; height: 44px; border-radius: 50%; background: #e0e0e0; margin-right: 12px; display: flex; align-items: center; justify-content: center; font-size: 18px; font-weight: 600; color: #555; flex-shrink: 0; }
.chat-info { flex: 1; min-width: 0; }
.chat-name { font-size: 16px; font-weight: 500; margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.last-msg { font-size: 14px; color: #888; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-right { display: flex; flex-direction: column; align-items: flex-end; margin-left: 8px; flex-shrink: 0; min-width: 56px; }
.chat-time { font-size: 12px; color: #aaa; white-space: nowrap; }
.room-actions { display: flex; gap: 4px; margin-top: 4px; }
.edit-room-btn { background: none; border: none; cursor: pointer; display: flex; align-items: center; padding: 2px; }
.edit-room-btn svg { width: 16px; height: 16px; stroke: #888; fill: none; stroke-width: 2; }

.summary-card { background: #f0f7ff; margin: 8px; border-radius: 12px; padding: 14px 16px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.summary-card h4 { font-size: 16px; font-weight: 500; }
.summary-card .summary-preview { font-size: 14px; color: #555; }

.chat-window { display: flex; flex-direction: column; height: 100%; }
.chat-header { background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%); color: #fff; padding: 0 16px; display: flex; align-items: center; min-height: 48px; }
.chat-header .back-btn { margin-right: 12px; }
.chat-header .chat-title { font-size: 17px; font-weight: 500; flex: 1; }
.messages { flex: 1; overflow-y: auto; padding: 12px; background: #fafafa; }
.msg { margin-bottom: 12px; display: flex; flex-direction: column; }
.msg.me { align-items: flex-end; }
.msg-bubble { max-width: 75%; padding: 10px 14px; border-radius: 20px; font-size: 16px; line-height: 1.5; word-wrap: break-word; overflow-wrap: break-word; cursor: pointer; }
.msg.me .msg-bubble { background: #d1f0d1; border-bottom-right-radius: 4px; }
.msg.other .msg-bubble { background: #fff; border: 1px solid #eee; border-bottom-left-radius: 4px; }
.msg-user { font-size: 12px; color: #888; margin-bottom: 2px; margin-left: 4px; }
.msg.me .msg-user { text-align: right; margin-right: 4px; }
.msg-time { font-size: 11px; color: #aaa; margin-top: 2px; }
.msg-bubble h1, .msg-bubble h2, .msg-bubble h3 { font-size: 16px; margin: 5px 0; }
.msg-bubble table { width: 100%; border-collapse: collapse; margin: 8px 0; }
.msg-bubble th, .msg-bubble td { border: 1px solid #ddd; padding: 4px; text-align: left; font-size: 14px; }
.msg-bubble th { background: #f0f0f0; }
.msg-bubble pre { background: #f0f0f0; padding: 8px; border-radius: 4px; overflow-x: auto; }
.msg-bubble code { background: #f0f0f0; padding: 2px 4px; border-radius: 3px; font-size: 14px; }

.input-area { padding: 8px 12px; border-top: 1px solid #eee; display: flex; align-items: center; background: #fff; gap: 8px; }
.input-area textarea { flex: 1; border: 1px solid #ddd; border-radius: 12px; padding: 10px 12px; font-size: 16px; outline: none; resize: none; min-height: 40px; max-height: 120px; overflow-y: hidden; line-height: 1.4; }
.file-upload-btn { background: none; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; padding: 4px; }
.file-upload-btn svg { width: 24px; height: 24px; stroke: #666; fill: none; stroke-width: 2; }
.send-btn { background: #3b82f6; border: none; color: #fff; width: 32px; height: 32px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; flex-shrink: 0; }
.send-btn svg { width: 18px; height: 18px; fill: #fff; }

.purchase-panel-overlay { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: #fff; z-index: 10; display: flex; flex-direction: column; }
.purchase-panel-header { background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%); color: #fff; padding: 0 16px; display: flex; justify-content: space-between; align-items: center; min-height: 48px; }
.purchase-panel-body { flex: 1; overflow-y: auto; padding: 12px; }
.purchase-month-group { margin-bottom: 20px; }
.purchase-month-header { background: #f5f5f5; font-size: 16px; font-weight: 600; padding: 10px 8px; border-radius: 4px; display: flex; justify-content: space-between; }
.purchase-item { padding: 12px 8px; border-bottom: 1px solid #f0f0f0; cursor: pointer; }
.purchase-item:active { background: #f9f9f9; }
.purchase-item .item-main { display: flex; justify-content: space-between; align-items: baseline; }
.purchase-item .item-name { font-size: 16px; font-weight: 500; }
.purchase-item .item-amount { font-size: 16px; font-weight: 600; }
.purchase-item .item-meta { display: flex; justify-content: space-between; margin-top: 4px; font-size: 13px; color: #888; flex-wrap: wrap; gap: 4px; }
.status-badge { background: #fef3c7; padding: 1px 6px; border-radius: 8px; font-size: 12px; }
.status-badge.done { background: #d1fae5; }

.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.5); display: flex; justify-content: center; align-items: center; z-index: 100; }
.modal { background: #fff; width: 90%; max-width: 400px; max-height: 80vh; border-radius: 12px; overflow: auto; padding: 16px; position: relative; }
.modal .modal-close-btn { position: absolute; top: 10px; right: 12px; background: none; border: none; cursor: pointer; }
.modal .modal-close-btn svg { width: 20px; height: 20px; stroke: #888; fill: none; stroke-width: 2; }
.modal h3 { margin-bottom: 12px; font-size: 18px; padding-right: 30px; }
.modal input { width: 100%; padding: 8px; margin: 8px 0; border: 1px solid #ddd; border-radius: 8px; font-size: 16px; }
.modal button { margin-right: 8px; padding: 8px 16px; border-radius: 8px; border: none; cursor: pointer; font-size: 16px; }
.modal .primary-btn { background: #3b82f6; color: #fff; }
.history-list { list-style: none; font-size: 14px; }
.history-list li { padding: 6px 0; border-bottom: 1px solid #f0f0f0; display: flex; }
.history-time { min-width: 80px; color: #888; margin-right: 10px; font-size: 13px; }
.img-thumb { width: 60px; height: 60px; object-fit: cover; border-radius: 4px; margin: 4px; border: 1px solid #eee; }
.attachments { display: flex; flex-wrap: wrap; margin: 8px 0; }
.msg-img { max-width: 200px; border-radius: 8px; margin: 4px 0; }
.msg-placeholder .msg-bubble { opacity: 0.6; }

.version { text-align: center; font-size: 12px; color: #aaa; margin-top: 16px; }

.fullscreen-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9); display: flex; align-items: center; justify-content: center;
    z-index: 200; cursor: pointer;
}
.fullscreen-overlay img { max-width: 100%; max-height: 100%; object-fit: contain; }
.fullscreen-overlay .fullscreen-text {
    background: #fff; padding: 20px; border-radius: 8px; max-width: 90%; max-height: 80%;
    overflow: auto; font-size: 16px; line-height: 1.5; color: #333;
}
.fullscreen-overlay .fullscreen-text img { max-width: 200px; border-radius: 8px; margin: 4px 0; }
.fullscreen-overlay .fullscreen-text table {
    width: 100%;
    border-collapse: collapse;
    margin: 8px 0;
}
.fullscreen-overlay .fullscreen-text th,
.fullscreen-overlay .fullscreen-text td {border: 1px solid #ddd;padding: 4px;text-align: left;font-size: 14px;}
.fullscreen-overlay .fullscreen-text th {background: #f0f0f0;}

.detail-row { margin-bottom: 8px; }

.white-list-tag {
  font-size: 12px;
  color: #555;
  background: #f0f0f0;
  padding: 2px 8px;
  border-radius: 10px;
  margin-right: 6px;
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: inline-block;
  vertical-align: middle;
}