* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: #f4f7f9;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 90%;
    max-width: 1200px;
    height: 85vh;
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

/* Login Screen */
#login-screen {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
    padding: 20px;
    background: linear-gradient(135deg, #4CAF50, #2E7D32);
    color: white;
}

#login-screen h1 {
    margin-bottom: 30px;
    font-size: 2.5rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    width: 80%;
    max-width: 350px;
    background-color: rgba(255, 255, 255, 0.9);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.login-form input {
    padding: 15px;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.login-form input:focus {
    border-color: #4CAF50;
    outline: none;
}

.login-form button {
    padding: 15px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
}

.login-form button:hover {
    background-color: #45a049;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Chat Screen */
#chat-screen {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.header {
    background-color: #4CAF50;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    z-index: 10;
}

.header h2 {
    font-size: 1.4rem;
    font-weight: 600;
}

.server-info {
    font-size: 14px;
    display: flex;
    gap: 15px;
    opacity: 0.9;
}

.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 280px;
    display: flex;
    flex-direction: column;
    background-color: #f5f5f5;
    border-right: 1px solid #e0e0e0;
}

.chat-selection {
    padding: 15px;
    border-bottom: 1px solid #e0e0e0;
}

.chat-option {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    margin-bottom: 5px;
    background-color: #e3f2fd; /* Light blue background for public chat */
    border-left: 3px solid #2196F3;
}

.chat-option:hover {
    background-color: #bbdefb;
}

.chat-option.active {
    background-color: #bbdefb;
    color: #1976D2;
    font-weight: bold;
}

.chat-option i {
    margin-right: 10px;
    font-size: 18px;
}

.users-section {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
}

.users-section h3 {
    margin-bottom: 15px;
    color: #333;
    font-size: 0.9rem;
    text-transform: uppercase;
    font-weight: 600;
    color: #666;
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.user-chat-option {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.user-chat-option:hover {
    background-color: #e8e8e8;
}

.user-chat-option.active {
    background-color: #e8f5e9;
    color: #4CAF50;
    font-weight: bold;
}

.user-chat-option .avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: #4CAF50;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    margin-right: 10px;
}

.user-chat-option .user-info {
    flex: 1;
}

.user-chat-option .username {
    font-weight: 500;
}

.user-chat-option .status {
    font-size: 12px;
    color: #666;
}

.user-chat-option .notification {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background-color: #4CAF50;
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12px;
    font-weight: bold;
}

/* Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    display: flex;
    align-items: center;
    background-color: #fff;
}

.chat-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background-color: #f9f9f9;
    display: flex;
    flex-direction: column;
}

.message {
    margin-bottom: 15px;
    padding: 12px 15px;
    border-radius: 12px;
    max-width: 75%;
    word-wrap: break-word;
    position: relative;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.message-self {
    background-color: #e8f5e9;
    border-bottom-right-radius: 2px;
    margin-left: auto;
    color: #333;
}

.message-other {
    background-color: #fff;
    border-bottom-left-radius: 2px;
    margin-right: auto;
}

.message-info {
    background-color: #e3f2fd;
    text-align: center;
    margin: 10px auto;
    padding: 8px 12px;
    border-radius: 20px;
    max-width: 90%;
    font-size: 0.9rem;
    color: #0277bd;
    box-shadow: none;
}

.message .sender {
    font-weight: bold;
    margin-bottom: 5px;
    color: #4CAF50;
}

.message .content {
    margin-bottom: 5px;
    line-height: 1.4;
}

.message .time {
    font-size: 11px;
    color: #999;
    text-align: right;
}

.message-input {
    display: flex;
    padding: 15px 20px;
    background-color: #fff;
    border-top: 1px solid #e0e0e0;
    align-items: center;
}

#message-input {
    flex: 1;
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 24px;
    font-size: 15px;
    transition: border-color 0.3s;
}

#message-input:focus {
    border-color: #4CAF50;
    outline: none;
}

#send-button {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: #4CAF50;
    color: white;
    border: none;
    margin-left: 10px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s;
}

#send-button:hover {
    background-color: #45a049;
    transform: scale(1.05);
}

#send-button i {
    font-size: 18px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        width: 100%;
        height: 100vh;
        border-radius: 0;
        max-width: none;
    }
    
    .sidebar {
        width: 70px;
    }
    
    .chat-option span,
    .user-chat-option .user-info {
        display: none;
    }
    
    .chat-option i {
        margin-right: 0;
        font-size: 22px;
    }
    
    .user-chat-option .avatar {
        margin-right: 0;
    }
}

/* Hide chat conversations by default */
.chat-conversation {
    display: none;
}

/* Only show active conversation */
.chat-conversation.active {
    display: flex;
    flex-direction: column;
    flex: 1;
}

#send-button:hover {
    background-color: #45a049;
}