:root {
    --bg-dark: #121212;
    --bg-darker: #1e1e1e;
    --bg-light: #2d2d2d;
    --text-primary: #e0e0e0;
    --text-secondary: #aaaaaa;
    --accent-color: #ffc107;
    --accent-dark: #2962ff;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    height: 100vh;
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main-container {
    display: flex;
    height: 100vh;
    max-width: 100%;
    margin: 0 auto;
}

.chat-container {
    display: flex;
    flex-direction: column;
    flex: 1;
    height: 100vh;
    border-right: 1px solid var(--bg-light);
}

.user-container {
    width: 220px;
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: #181818;
    border-right: 1.5px solid #222;
    padding: 10px 0;
}

.chat-header, .user-header {
    background-color: var(--bg-darker);
    padding: 15px;
    border-bottom: 1px solid var(--bg-light);
    font-weight: bold;
    text-align: center;
}

.user-header {
    color: var(--accent-color);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background-color: var(--bg-darker);
}

.message {
    margin-bottom: 15px;
    padding: 10px;
    border-radius: 5px;
    background-color: var(--bg-light);
    word-wrap: break-word;
    word-break: break-word;
    overflow-wrap: break-word;
    white-space: normal;
    width: 100%;
    display: flex;
    flex-wrap: wrap;
}

.message-sender {
    color: var(--accent-color);
    cursor: pointer;
    margin-right: 5px;
    font-size: 0.9em;
}

.message-content {
    flex: 1 1 100%;
    min-width: 0;
    word-wrap: break-word;
    word-break: break-word;
    font-size: 0.9em;
}

.message-sender:hover {
    text-decoration: underline;
}

.message-time {
    font-size: 0.8em;
    color: var(--text-secondary);
    margin-left: auto;
    padding-left: 10px;
}

.private-message {
    border-left: 3px solid var(--accent-dark);
    padding-left: 10px;
    color: var(--accent-dark) ;
}

.private-message .message-sender {
    color: var(--accent-dark) !important;
}

.chat-input {
    display: flex;
    padding: 10px;
    background-color: var(--bg-darker);
    border-top: 1px solid var(--bg-light);
}

#messageInput {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--bg-light);
    border-radius: 5px;
    background-color: var(--bg-light);
    color: var(--text-primary);
    font-size: 0.95rem;
}

#sendButton {
    margin-left: 10px;
    padding: 10px 20px;
    background-color: var(--accent-dark);
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.95rem;
}

#sendButton:hover {
    background-color: var(--accent-color);
}

.online-count {
    color: var(--accent-color);
    font-weight: bold;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-dark);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

.online-users-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 0 6px;
}

.user-item {
    background: #232323;
    color: #fff;
    border-radius: 6px;
    padding: 5px 0;
    text-align: center;
    font-size: 0.8em;
    font-weight: 400;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    border: none;
    margin-bottom: 0;
}

.user-item:hover, .user-item:focus {
    background: #3a3a3a;
    color: #ffc107;
}

.user-item.selected, .user-item[aria-current="true"] {
    background: #ffc107;
    color: #fff;
}

.user-item.me {
    font-weight: 600;
}

@media (max-width: 768px) {
    .user-container {
        display: none !important;
    }
}

.chat-header {
    background-color: var(--bg-darker);
    padding: 15px;
    border-bottom: 1px solid var(--bg-light);
    font-weight: bold;
    font-size:0.95rem;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.language-selector {
    position: absolute;
    right: 15px;
}

.language-select {
    background-color: var(--bg-light);
    color: var(--text-primary);
    border: 1px solid var(--bg-light);
    border-radius: 4px;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 0.9em;
}

.language-select:hover {
    border-color: var(--accent-color);
}

.language-select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.language-select option {
    background-color: var(--bg-darker);
    color: var(--text-primary);
}