body {
    font-family: Arial, sans-serif;
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}

.layout {
    display: grid;
    grid-template-columns: 1fr 260px;
    gap: 20px;
    align-items: start;
}

.container {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.sidebar {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 20px;
}

.sidebar h2 {
    margin: 0 0 12px;
    font-size: 16px;
}

.online-list {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 60vh;
    overflow-y: auto;
}

.online-list li {
    padding: 6px 8px;
    border-radius: 4px;
    font-family: ui-monospace, Menlo, Consolas, monospace;
    font-size: 12px;
    word-break: break-all;
    border-left: 3px solid transparent;
}

.online-list li + li { margin-top: 4px; }

.online-list li.online-self {
    background: #e8f5e8;
    border-left-color: #4caf50;
    font-weight: bold;
}

.online-list li.online-empty {
    color: #999;
    font-style: italic;
    font-family: inherit;
}

.sid-badge {
    display: inline-block;
    margin-left: 10px;
    padding: 2px 8px;
    font-size: 12px;
    font-weight: normal;
    color: #555;
    background: #eef;
    border-radius: 4px;
    vertical-align: middle;
}

.sid-badge code {
    font-family: ui-monospace, Menlo, Consolas, monospace;
}

.status {
    padding: 10px;
    margin: 10px 0;
    border-radius: 4px;
    font-weight: bold;
}

.connected {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.disconnected {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.connecting {
    background-color: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
}

#messages {
    border: 1px solid #ddd;
    height: 300px;
    overflow-y: auto;
    padding: 10px;
    margin: 10px 0;
    background-color: #f9f9f9;
    border-radius: 4px;
}

.message {
    margin: 5px 0;
    padding: 6px 3px;
    border-radius: 4px;
    word-wrap: break-word;
    font-size: 12px;
}

.sent {
    background-color: #e3f2fd;
    text-align: right;
    border-left: 3px solid #2196f3;
}

.received {
    background-color: #f3e5f5;
    border-left: 3px solid #9c27b0;
}

.welcome {
    background-color: #e8f5e8;
    border-left: 3px solid #4caf50;
}

.chat-inputs {
    display: flex;
    gap: 7px;
}

.chat-inputs input[type="text"] {
    width: 70%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
    flex: 1;
}

.chat-inputs button {
    padding: 8px 15px;
    background-color: #2196f3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.chat-inputs button:hover {
    background-color: #1976d2;
}

.chat-inputs button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.info {
    background-color: #e1f5fe;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-left: 3px solid #03a9f4;
}