/* Estilos Gerais */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

:root {
    --primary-color: #4a76a8;
    --primary-dark: #385d8a;
    --secondary-color: #e1e9f5;
    --success-color: #4CAF50;
    --danger-color: #f44336;
    --text-color: #333;
    --light-text: #777;
    --border-color: #ddd;
    --background-light: #f9f9f9;
}

body {
    background-color: var(--background-light);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

.container {
    height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0;
}

/* Estilos de Login */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.login-box {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-box h2 {
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

.input-group {
    margin-bottom: 1rem;
}

.input-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.login-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    width: 100%;
}

.login-btn:hover {
    background-color: var(--primary-dark);
}

/* Estilos do Chat */
.chat-container {
    display: flex;
    height: 100vh;
}

.chat-sidebar {
    width: 250px;
    background-color: white;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--primary-color);
    color: white;
}

.online-users {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.user-item {
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    cursor: pointer;
    transition: background-color 0.2s;
}

.user-item:hover {
    background-color: var(--secondary-color);
}

.user-item.active {
    background-color: var(--secondary-color);
}

.user-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--success-color);
    margin-right: 10px;
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: white;
}

.chat-header {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--primary-color);
    color: white;
}

.chat-header h2 {
    font-size: 1.2rem;
    font-weight: 500;
}

#chat-status {
    font-size: 0.8rem;
    font-weight: normal;
    margin-left: 0.5rem;
    color: rgba(255, 255, 255, 0.8);
}

.user-info {
    display: flex;
    align-items: center;
}

#current-user {
    margin-right: 1rem;
}

#logout-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 1.2rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
}

.message {
    margin-bottom: 1rem;
    max-width: 70%;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    position: relative;
    word-break: break-word;
}

.message-received {
    align-self: flex-start;
    background-color: var(--secondary-color);
}

.message-sent {
    align-self: flex-end;
    background-color: var(--primary-color);
    color: white;
}

.message-username {
    font-weight: bold;
    font-size: 0.8rem;
    margin-bottom: 0.3rem;
}

.message-text {
    font-size: 0.95rem;
}

.message-time {
    font-size: 0.7rem;
    color: rgba(0, 0, 0, 0.5);
    position: absolute;
    bottom: 0.3rem;
    right: 0.75rem;
}

.message-sent .message-time {
    color: rgba(255, 255, 255, 0.7);
}

.system-message {
    align-self: center;
    background-color: #f0f0f0;
    color: var(--light-text);
    border-radius: 1rem;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    margin: 0.5rem 0;
}

.chat-typing {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    color: var(--light-text);
    min-height: 24px;
}

.chat-form-container {
    padding: 1rem;
    border-top: 1px solid var(--border-color);
}

.chat-input {
    display: flex;
}

.chat-input input {
    flex: 1;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.chat-input button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    margin-left: 0.5rem;
    width: 50px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.chat-input button:hover {
    background-color: var(--primary-dark);
}

/* Estilos Responsivos */
@media (max-width: 768px) {
    .chat-container {
        flex-direction: column;
    }

    .chat-sidebar {
        width: 100%;
        height: 200px;
    }

    .message {
        max-width: 90%;
    }
}