/* 全域設定 */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #313338;
    color: #f2f3f5;
}

/* 主畫面 */
.app {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* 左側伺服器欄 */
.server-sidebar {
    width: 72px;
    background: #1e1f22;
    padding: 15px 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.server-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: #5865f2;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    cursor: pointer;
    transition: 0.2s;
}

.server-icon:hover {
    border-radius: 15px;
    background: #4752c4;
}

/* 頻道列表 */
.channel-sidebar {
    width: 240px;
    background: #2b2d31;
    display: flex;
    flex-direction: column;
}

.server-title {
    padding: 20px;
    font-size: 18px;
    font-weight: bold;
    border-bottom: 1px solid #232428;
}

.channel-title {
    padding: 20px 15px 10px;
    font-size: 13px;
    color: #949ba4;
}

.channel {
    margin: 3px 10px;
    padding: 12px;
    border-radius: 5px;
    cursor: pointer;
    color: #949ba4;
}

.channel:hover,
.channel.active {
    background: #404249;
    color: white;
}

/* 使用者資料 */
.user-panel {
    margin-top: auto;
    padding: 15px;
    background: #232428;
    display: flex;
    align-items: center;
    gap: 10px;
}

.avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #23a559;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* 聊天主區域 */
.chat-container {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.chat-header {
    height: 60px;
    padding: 18px 25px;
    border-bottom: 1px solid #26272b;
    font-weight: bold;
    font-size: 18px;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 25px;
}

.message {
    display: flex;
    gap: 15px;
    margin-bottom: 22px;
}

.message-content {
    flex: 1;
}

.message-author {
    font-weight: bold;
    margin-bottom: 5px;
}

.message-time {
    color: #949ba4;
    font-size: 12px;
    margin-left: 10px;
}

.message-text {
    line-height: 1.6;
    color: #dbdee1;
    overflow-wrap: anywhere;
}

/* 訊息輸入 */
.message-input-area {
    padding: 15px 25px 25px;
    display: flex;
    gap: 10px;
}

.message-input {
    flex: 1;
    min-width: 0;
    padding: 15px;
    border: none;
    border-radius: 8px;
    background: #383a40;
    color: white;
    font-size: 15px;
    outline: none;
}

.send-button {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    background: #5865f2;
    color: white;
    cursor: pointer;
    font-weight: bold;
}

.send-button:hover {
    background: #4752c4;
}

/* 右側成員列表 */
.member-sidebar {
    width: 220px;
    background: #2b2d31;
    padding: 20px 15px;
}

.member-title {
    color: #949ba4;
    font-size: 13px;
    margin-bottom: 20px;
}

.member {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
}

.online-dot {
    width: 10px;
    height: 10px;
    background: #23a559;
    border-radius: 50%;
}

/* 小螢幕適應 */
@media (max-width: 900px) {
    .member-sidebar {
        display: none;
    }
}

@media (max-width: 600px) {
    .channel-sidebar {
        width: 150px;
    }

    .server-sidebar {
        width: 55px;
    }

    .message-input-area {
        padding: 10px;
    }
}

/* 讓左側頻道、好友與群組管理區域可以上下捲動 */
.channel-sidebar {
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
}

/* 美化左側捲軸 */
.channel-sidebar::-webkit-scrollbar {
    width: 6px;
}

.channel-sidebar::-webkit-scrollbar-thumb {
    background-color: #555;
    border-radius: 10px;
}

.channel-sidebar::-webkit-scrollbar-track {
    background-color: #2b2d31;
}

/* =====================================
   介面美化：通知中心與群組管理
===================================== */

/* 左側欄位中的操作按鈕 */
.channel-sidebar button {
    background-color: #404249;
    color: #f2f3f5;
    border: none;
    border-radius: 6px;
    padding: 10px;
    cursor: pointer;
    transition: background-color 0.2s;
}

/* 滑鼠移到按鈕上 */
.channel-sidebar button:hover {
    background-color: #5865f2;
}

/* 左側輸入框與選單 */
.channel-sidebar input,
.channel-sidebar select {
    background-color: #1e1f22;
    color: #f2f3f5;
    border: 1px solid #404249;
    border-radius: 6px;
    padding: 10px;
}

/* 輸入框被選取時 */
.channel-sidebar input:focus,
.channel-sidebar select:focus {
    outline: none;
    border-color: #5865f2;
}

/* 通知中心 */
.notifications-panel {
    background-color: #2b2d31;
    border-radius: 8px;
    margin-bottom: 15px;
}

/* 通知列表 */
#notificationsList {
    line-height: 1.5;
    overflow-wrap: anywhere;
}

/* 群組列表 */
#groupsList {
    margin-top: 10px;
}

/* 左側區塊標題 */
.channel-sidebar .channel-title {
    margin-top: 12px;
    margin-bottom: 10px;
}