/* ==========================================
   侧边栏 — 频道列表、语音用户、用户状态栏
   ========================================== */
.sidebar {
    width: 260px;
    background: var(--bg-sidebar);
    display: flex;
    flex-direction: column;
    border-right: 1px solid rgba(0,0,0,0.2);
    flex-shrink: 0;
    position: relative;
    z-index: 10;
}

/* 诊断面板区 — 始终固定在频道列表下方 */
.diag-section {
    flex-shrink: 0;
    overflow: hidden;
}

.server-header {
    height: 48px;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    font-weight: bold;
    font-size: var(--font-size-xl);
    border-bottom: 1px solid rgba(0,0,0,0.2);
    box-shadow: var(--shadow-bar);
    justify-content: space-between;
}

/* 汉堡菜单按钮 (移动端可见) */
.hamburger-btn {
    display: none;
    width: 32px;
    height: 32px;
    background: transparent;
    color: var(--text-normal);
    font-size: 1.2rem;
    border-radius: var(--radius-sm);
    align-items: center;
    justify-content: center;
}
.hamburger-btn:hover {
    background: var(--bg-hover);
}

/* 侧边栏遮罩 (移动端) */
.sidebar-overlay {
    display: none;
}

/* 频道列表 */
.channel-list {
    flex: 1;
    overflow: hidden auto;
    padding: var(--space-md) var(--space-sm);
}

.category-title {
    font-size: var(--font-size-sm);
    font-weight: bold;
    color: var(--text-muted);
    padding: 0 var(--space-sm);
    margin-bottom: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 语音频道 */
.voice-channel {
    padding: 6px var(--space-sm);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    color: var(--text-muted);
    transition: background var(--transition-normal),
                color var(--transition-normal);
}
.voice-channel:hover {
    background: var(--bg-hover);
    color: var(--text-normal);
}
.voice-channel.active {
    background: rgba(88, 101, 242, 0.15);
    color: var(--primary);
}

/* 语音用户列表 */
.voice-users {
    margin-left: 20px;
    margin-top: var(--space-xs);
    display: none;
    flex-direction: column;
    gap: 2px;
}
.voice-users.open {
    display: flex;
}

.voice-user {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--font-size-md);
    color: var(--text-muted);
    position: relative;
}
.voice-user:hover {
    background: var(--bg-hover);
    color: var(--text-normal);
}

/* 用户头像 */
.voice-user .avatar,
.msg-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-round);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
    font-weight: bold;
    flex-shrink: 0;
    position: relative;
}

/* 说话指示灯绿点 */
.speaking-dot {
    position: absolute;
    bottom: -1px;
    right: -1px;
    width: 12px;
    height: 12px;
    border-radius: var(--radius-round);
    background: var(--speaking);
    border: 2px solid var(--bg-sidebar);
    opacity: 0;
    transition: opacity var(--transition-fast);
}
.speaking-dot.active {
    opacity: 1;
}

/* 连接质量图标 */
.conn-quality {
    font-size: 0.65rem;
    margin-left: 2px;
    opacity: 0.8;
}

/* 用户状态栏 (底部) */
.user-bar {
    height: 52px;
    background: var(--bg-user-bar);
    padding: 0 var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    min-width: 0;
}
.user-info:hover {
    background: var(--bg-hover);
}

.my-avatar {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-round);
    background: var(--danger);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
    flex-shrink: 0;
}

.my-name {
    font-size: var(--font-size-md);
    font-weight: bold;
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100px;
}

.my-id {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100px;
}
.my-id:hover {
    color: var(--primary);
}

/* 控制按钮组 */
.control-btns {
    display: flex;
    gap: var(--space-xs);
}

/* 侧边栏拖动分隔条 */
.sidebar-resizer {
    width: 4px;
    cursor: col-resize;
    background: transparent;
    flex-shrink: 0;
    transition: background var(--transition-fast);
    position: relative;
    z-index: 20;
}
.sidebar-resizer:hover,
.sidebar-resizer.active {
    background: var(--primary);
}
.sidebar-resizer::after {
    content: '';
    position: absolute;
    left: -4px;
    right: -4px;
    top: 0;
    bottom: 0;
}