* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* Tema Claro */
body.light-theme {
    --bg-primary: #f0f2f5;
    --bg-secondary: #ffffff;
    --text-primary: #050505;
    --text-secondary: #65676b;
    --border-color: #e4e6eb;
    --message-bg: #e4e6eb;
    --message-own-bg: #0084ff;
    --message-own-text: #ffffff;
    --message-bot-bg: #6441a5;
    --hover-bg: #f0f2f5;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --input-bg: #ffffff;
    --sidebar-bg: #ffffff;
    --online-indicator: #31a24c;
}

/* Tema Escuro */
body.dark-theme {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --border-color: #3e4042;
    --message-bg: #3e4042;
    --message-own-bg: #0084ff;
    --message-own-text: #ffffff;
    --message-bot-bg: #4a2c7a;
    --hover-bg: #3e4042;
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    --input-bg: #3e4042;
    --sidebar-bg: #2d2d2d;
    --online-indicator: #44d62c;
}

/* Telas */
.screen {
    display: none;
    height: 100vh;
    width: 100vw;
}

.screen.active {
    display: block;
}

/* Login Screen */
#login-screen {
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    background-color: var(--bg-secondary);
    padding: 40px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 400px;
    position: relative;
}

.login-container h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--text-primary);
    font-size: 28px;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s;
}

.theme-btn:hover {
    transform: scale(1.1);
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

#login-form input {
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 16px;
}

#login-form input:focus {
    outline: none;
    border-color: #0084ff;
}

#login-form button {
    padding: 14px;
    background-color: #0084ff;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: background-color 0.3s;
}

#login-form button:hover {
    background-color: #0073e6;
}

.hint {
    margin-top: 20px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.6;
}

/* Chat Screen */
.chat-container {
    display: flex;
    height: 100vh;
    background-color: var(--bg-primary);
}

/* Sidebar */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.user-info {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

#current-user {
    font-weight: bold;
    color: var(--text-primary);
    font-size: 16px;
}

.user-role {
    font-size: 12px;
    padding: 4px 10px;
    background-color: var(--message-bg);
    border-radius: 20px;
    color: var(--text-secondary);
    display: inline-block;
    width: fit-content;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

#logout-btn {
    padding: 10px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

#logout-btn:hover {
    background-color: #c82333;
}

.online-users {
    flex: 1;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    overflow-y: auto;
}

.online-users h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
}

#online-count {
    background-color: #0084ff;
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
}

#online-list {
    list-style: none;
}

#online-list li {
    padding: 10px 12px;
    margin-bottom: 5px;
    border-radius: 8px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--message-bg);
    transition: background-color 0.2s;
}

#online-list li:hover {
    background-color: var(--hover-bg);
}

#online-list li::before {
    content: "●";
    color: var(--online-indicator);
    font-size: 14px;
    margin-right: 5px;
}

.admin-panel {
    padding: 20px;
}

.admin-panel h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
    font-size: 16px;
}

.admin-panel button {
    width: 100%;
    padding: 12px;
    margin-bottom: 8px;
    background-color: var(--message-bg);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    text-align: left;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
}

.admin-panel button:hover {
    background-color: var(--hover-bg);
    transform: translateX(5px);
}

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

.chat-header {
    padding: 20px;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h2 {
    color: var(--text-primary);
    font-size: 20px;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.message {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    background-color: var(--message-bg);
    color: var(--text-primary);
    align-self: flex-start;
    word-wrap: break-word;
    position: relative;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.message.own {
    background-color: var(--message-own-bg);
    color: var(--message-own-text);
    align-self: flex-end;
}

.message.bot {
    background-color: var(--message-bot-bg);
    color: white;
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    font-size: 12px;
    gap: 10px;
}

.message-username {
    font-weight: bold;
    color: inherit;
    opacity: 0.9;
}

.message-time {
    font-size: 10px;
    opacity: 0.7;
}

.message-content {
    line-height: 1.5;
    font-size: 14px;
}

.message-content a {
    color: inherit;
    text-decoration: underline;
    opacity: 0.9;
}

.message-content a:hover {
    opacity: 1;
}

.message-preview {
    margin-top: 10px;
    max-width: 100%;
    border-radius: 8px;
    overflow: hidden;
}

.message-preview img {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s;
}

.message-preview img:hover {
    transform: scale(1.02);
}

.message-preview video {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
}

.message-delete {
    margin-top: 8px;
    text-align: right;
    opacity: 0;
    transition: opacity 0.2s;
}

.message:hover .message-delete {
    opacity: 1;
}

.delete-btn {
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 14px;
    opacity: 0.6;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.delete-btn:hover {
    opacity: 1;
    background-color: rgba(255, 255, 255, 0.2);
}

/* Input Area */
.input-container {
    padding: 20px;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    align-items: flex-end;
}

#message-input {
    flex: 1;
    padding: 14px;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    resize: none;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    transition: border-color 0.2s;
}

#message-input:focus {
    outline: none;
    border-color: #0084ff;
}

#send-btn {
    padding: 14px 28px;
    background-color: #0084ff;
    color: white;
    border: none;
    border-radius: 24px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: all 0.3s;
}

#send-btn:hover {
    background-color: #0073e6;
    transform: scale(1.05);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    width: 90%;
    max-width: 900px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow);
    animation: slideIn 0.3s;
}

@keyframes slideIn {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background-color: var(--bg-secondary);
    z-index: 10;
}

.modal-header h3 {
    color: var(--text-primary);
    font-size: 18px;
}

.close-modal {
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: color 0.2s;
}

.close-modal:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
}

/* Tabelas de gestão */
.users-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

.users-table th,
.users-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.users-table th {
    background-color: var(--message-bg);
    font-weight: bold;
    position: sticky;
    top: 0;
}

.users-table tr:hover {
    background-color: var(--hover-bg);
}

.users-table button {
    padding: 6px 12px;
    margin-right: 5px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.users-table .edit-btn {
    background-color: #28a745;
    color: white;
}

.users-table .edit-btn:hover {
    background-color: #218838;
}

.users-table .delete-btn {
    background-color: #dc3545;
    color: white;
}

.users-table .delete-btn:hover {
    background-color: #c82333;
}

.users-table .permissions-btn {
    background-color: #17a2b8;
    color: white;
}

.users-table .permissions-btn:hover {
    background-color: #138496;
}

/* Formulários de gestão */
.admin-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--message-bg);
    border-radius: 8px;
}

.admin-form h4 {
    color: var(--text-primary);
    margin-bottom: 10px;
}

.admin-form input,
.admin-form select {
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 14px;
}

.admin-form input:focus,
.admin-form select:focus {
    outline: none;
    border-color: #0084ff;
}

.admin-form button {
    padding: 12px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

.admin-form button:hover {
    background-color: #218838;
}

/* Checkbox de permissões */
.permissions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 15px;
    margin: 20px 0;
}

.permission-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-primary);
    padding: 8px;
    border-radius: 6px;
    background-color: var(--input-bg);
}

.permission-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Mensagens de sistema */
.system-message {
    text-align: center;
    color: var(--text-secondary);
    font-size: 13px;
    padding: 20px;
    font-style: italic;
}

/* Scrollbar personalizada */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--text-primary);
}

/* Responsividade */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -300px;
        transition: left 0.3s;
        z-index: 100;
        height: 100vh;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .main-chat {
        width: 100%;
    }
    
    .message {
        max-width: 85%;
    }
    
    .login-container {
        margin: 20px;
        padding: 30px;
    }
}