/* Основные стили и переменные */
:root {
    --bg-main: #1e1e1e;
    --bg-surface: #2d2d2d;
    --bg-surface-hover: #3a3a3c;
    --border-color: #3e3e42;
    --text-primary: #d4d4d4;
    --text-secondary: #a0a0a0;
    --brand-blue: #007bff;
    --operator-bubble: #004e89;
    --error-red: #d93025;
}

body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    overflow: hidden;
    background-color: var(--bg-main);
    color: var(--text-primary);
}

/* --- Окно авторизации --- */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.login-box {
    background-color: var(--bg-surface);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    text-align: center;
    width: 300px;
    border: 1px solid var(--border-color);
}

.login-box h2 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.login-box input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
    border-radius: 4px;
    box-sizing: border-box;
}

.login-box input::placeholder {
    color: var(--text-secondary);
}

.login-box button {
    width: 100%;
    padding: 10px;
    background-color: var(--brand-blue);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
}

.error-message {
    color: var(--error-red);
    margin-top: 10px;
    height: 1em;
}

/* --- Основной интерфейс --- */
.app-container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 25%;
    max-width: 300px;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 15px;
    font-weight: bold;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-main);
    text-align: center;
}

.chat-item {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-item:hover {
    background-color: var(--bg-surface-hover);
}

.chat-item.active {
    background-color: var(--brand-blue);
    color: white;
}

.unread-badge {
    background-color: var(--error-red);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 12px;
    display: none;
    justify-content: center;
    align-items: center;
}

.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    font-weight: bold;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#close-chat-button {
    padding: 5px 10px;
    background-color: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

.messages-container {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background-color: var(--bg-main);
    display: flex;
    flex-direction: column;
}

.message {
    margin-bottom: 10px;
    padding: 10px 15px;
    border-radius: 18px;
    max-width: 70%;
    line-height: 1.4;
    word-wrap: break-word;
}

.client-message {
    background-color: var(--bg-surface-hover);
    align-self: flex-start;
    margin-right: auto;
}

.operator-message {
    background-color: var(--operator-bubble);
    color: #ffffff;
    align-self: flex-end;
    margin-left: auto;
}

.message-input-container {
    display: flex;
    padding: 10px;
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-surface);
}

#reply-input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface-hover);
    color: var(--text-primary);
    border-radius: 20px;
    resize: none;
    font-size: 14px;
    margin-right: 10px;
}

#send-button {
    padding: 10px 20px;
    background-color: var(--brand-blue);
    color: white;
    border: none;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
}