*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color var(--transition-duration), color var(--transition-duration);
    overflow-x: hidden;
}

.page-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    height: 100vh;
    overflow: hidden;
}

:root {
    --turquoise: #40E0D0;
    --white: #FFFFFF;
    --dark-gray: #2F4F4F;
    --light-gray: #D3D3D3;
    --red: #FF4500;

    --button-bg-primary: var(--turquoise);
    --button-bg-secondary: var(--light-gray);
    --button-text-color: #FFFFFF;
    --input-bg: var(--white);
    --input-border: var(--light-gray);
    --transition-duration: 0.3s;
    --scrollbar-track: var(--light-gray);
    --scrollbar-thumb: var(--turquoise);
    --message-bg-user: #e8f4f8;
    --background-color: #FFFFFF;
    --text-color: var(--dark-gray);
    --header-bg: var(--turquoise);
    --font-primary: 'Roboto', sans-serif;
    --font-secondary: 'Open Sans', sans-serif;
    --font-logo: 'Pacifico', cursive;
    --chat-message-bg: #e8f4f8;
    --chat-message-text: var(--dark-gray);
    --chat-message-border: var(--turquoise);
}

html.dark-theme {
    --background-color: #2F4F4F;
    --white: #E0E0E0;
    --text-color: #FFFFFF;
    --header-bg: #333333;
    --button-bg-primary: #20B2AA;
    --button-bg-secondary: #555555;
    --button-text-color: #E0E0E0;
    --input-bg: #3C3C3C;
    --input-border: #555555;
    --scrollbar-track: #333333;
    --scrollbar-thumb: #20B2AA;
    --message-bg-user: #4A4A4A;
    --logo-color: var(--turquoise);
    --chat-message-bg: #4A4A4A;
    --chat-message-text: #E0E0E0;
    --chat-message-border: var(--turquoise);
}

header {
    background-color: var(--header-bg);
    color: var(--white);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color var(--transition-duration);
}

header h2 {
    margin: 0;
    font-size: 2em;
    font-family: var(--font-logo);
    color: var(--logo-color, var(--white));
}

.header-buttons {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle-label {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-toggle-label input {
    opacity: 0;
    width: 0;
    height: 0;
}

.theme-toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--light-gray);
    transition: background-color var(--transition-duration);
    border-radius: 34px;
}

.theme-toggle-slider::before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: var(--white);
    transition: transform var(--transition-duration);
    border-radius: 50%;
}

input:checked + .theme-toggle-slider {
    background-color: var(--turquoise);
}

input:checked + .theme-toggle-slider::before {
    transform: translateX(26px);
}

.btn,
.btn-primary,
.btn-secondary,
.btn-danger {
    padding: 10px 15px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color var(--transition-duration);
    font-size: 1em;
    font-family: var(--font-secondary);
    word-wrap: break-word;
}

.btn-danger {
    background-color: var(--red);
    color: var(--button-text-color);
}

.btn-danger:hover {
    background-color: #E03E00;
}

html.dark-theme .btn-danger {
    background-color: #FF6347;
    color: #1E1E1E;
}

html.dark-theme .btn-danger:hover {
    background-color: #FF7F50;
}

.btn-primary {
    background-color: var(--button-bg-primary);
    color: var(--button-text-color);
}

.btn-primary:hover {
    background-color: #00CED1;
}

.btn-secondary {
    background-color: var(--button-bg-secondary);
    color: var(--button-text-color);
}

.btn-secondary:hover {
    background-color: #B0BEC5;
}

html.dark-theme .btn-secondary:hover {
    background-color: #999999;
}

html:not(.dark-theme) .logout-button,
html:not(.dark-theme) .leave-lobby-button {
    background-color: var(--light-gray);
    color: var(--button-text-color);
}

html:not(.dark-theme) .logout-button:hover,
html:not(.dark-theme) .leave-lobby-button:hover {
    background-color: var(--light-gray);
    color: var(--button-text-color);
}

html.dark-theme .logout-button,
html.dark-theme .leave-lobby-button {
    background-color: var(--button-bg-primary);
    color: var(--button-text-color);
}

html.dark-theme .logout-button:hover,
html.dark-theme .leave-lobby-button:hover {
    background-color: var(--button-bg-primary);
    color: var(--button-text-color);
}

form {
    background-color: var(--input-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
    transition: background-color var(--transition-duration), border-color var(--transition-duration);
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    font-size: 1em;
    transition: border-color var(--transition-duration), background-color var(--transition-duration), color var(--transition-duration);
    background-color: var(--input-bg);
    color: var(--text-color);
    word-wrap: break-word;
}

html.dark-theme input[type="text"],
html.dark-theme input[type="password"] {
    background-color: #555555;
    border-color: #777777;
    color: var(--text-color);
}

input[type="submit"],
.logout-button {
    padding: 10px 15px;
    background-color: var(--button-bg-primary);
    color: var(--button-text-color);
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    transition: background-color var(--transition-duration), color var(--transition-duration);
    font-family: var(--font-secondary);
    word-wrap: break-word;
}

input[type="submit"]:hover,
.logout-button:hover {
    background-color: #00CED1;
}

.create-lobby-form .action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.container {
    flex: 1;
    display: flex;
    flex-direction: row;
    overflow: hidden;
}

.sidebar {
    width: 250px;
    background-color: var(--input-bg);
    border-right: 1px solid var(--input-border);
    display: flex;
    flex-direction: column;
    padding: 20px;
    overflow-y: auto;
    transition: background-color var(--transition-duration), border-color var(--transition-duration);
}

html.dark-theme .sidebar {
    background-color: #2C2C2C;
    color: var(--white);
    border-color: #555555;
}

.sidebar h3 {
    margin-top: 0;
    color: var(--text-color);
    font-size: 1.2em;
    font-family: var(--font-secondary);
}

.lobby-list {
    flex: 1;
    margin-bottom: 20px;
}

.lobby-item {
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid var(--turquoise);
    border-radius: 5px;
    cursor: pointer;
    transition: background-color var(--transition-duration), transform var(--transition-duration);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--input-bg);
    font-family: var(--font-secondary);
    word-wrap: break-word;
    white-space: normal;
    overflow-wrap: break-word;
}

html.dark-theme .lobby-item {
    background-color: #3C3C3C;
    border-color: var(--turquoise);
    color: var(--white);
}

.lobby-item:hover {
    background-color: #e0f2f1;
    transform: scale(1.02);
}

html.dark-theme .lobby-item:hover {
    background-color: #4C4C4C;
}

.admin-tag {
    background-color: var(--red);
    color: var(--white);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.8em;
    font-family: var(--font-secondary);
    word-wrap: break-word;
}

.create-lobby-form {
    display: none;
    flex-direction: column;
    gap: 10px;
    transition: opacity var(--transition-duration), visibility var(--transition-duration);
    opacity: 0;
    visibility: hidden;
}

#createLobbyButton {
    margin-top: auto;
    margin-bottom: 10px;
}

.create-lobby-form.active {
    display: flex;
    opacity: 1;
    visibility: visible;
}

.create-lobby-form input {
    padding: 10px;
    margin-bottom: 0;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    font-size: 1em;
    font-family: var(--font-primary);
    transition: border-color var(--transition-duration), background-color var(--transition-duration), color var(--transition-duration);
    background-color: var(--input-bg);
    color: var(--text-color);
    white-space: normal;
    word-wrap: break-word;
}

html.dark-theme .create-lobby-form input {
    background-color: #555555;
    border-color: #777777;
    color: var(--text-color);
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 20px;
    box-sizing: border-box;
    background-color: var(--input-bg);
    border-bottom: 1px solid var(--input-border);
    transition: background-color var(--transition-duration), border-color var(--transition-duration);
    overflow: hidden;
}

html.dark-theme .chat-container {
    background-color: #3C3C3C;
    border-color: #555555;
    color: var(--white);
}

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.chat-header h3 {
    margin: 0;
    color: var(--text-color);
    font-size: 1.2em;
    font-family: var(--font-secondary);
}

.chat-header-buttons {
    display: flex;
    align-items: center;
    gap: 10px;
}

.chat-header-buttons .btn-secondary {
    min-width: 120px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    word-wrap: break-word;
}

.chat-messages {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    border: 1px solid var(--chat-message-border);
    border-radius: 5px;
    padding: 10px;
    overflow-y: auto;
    background-color: var(--chat-message-bg);
    margin-bottom: 10px;
    width: 100%;
    box-sizing: border-box;
    transition: border-color var(--transition-duration), background-color var(--transition-duration);
}

html.dark-theme .chat-messages {
    background-color: var(--chat-message-bg);
    color: var(--chat-message-text);
    border-color: var(--chat-message-border);
}

.chat-input {
    display: flex;
    align-items: stretch;
    min-height: 40px;
}

.chat-input input {
    flex: 1;
    padding: 10px;
    border: 1px solid var(--input-border);
    border-radius: 5px 0 0 5px;
    font-size: 1em;
    outline: none;
    font-family: var(--font-primary);
    transition: border-color var(--transition-duration), background-color var(--transition-duration), color var(--transition-duration);
    background-color: var(--input-bg);
    color: var(--text-color);
    overflow-wrap: break-word;
    white-space: pre-wrap;
    max-height: 100px;
    box-sizing: border-box;
    word-wrap: break-word;
    height: 100%; /* Добавлено */
    min-height: 40px; /* Добавлено */
}

html.dark-theme .chat-input input {
    background-color: #555555;
    border-color: #777777;
    color: var(--text-color);
}

.chat-input button {
    padding: 10px 15px;
    border: none;
    background-color: var(--button-bg-primary);
    color: var(--button-text-color);
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    transition: background-color var(--transition-duration);
    font-size: 1em;
    font-family: var(--font-secondary);
    height: auto; /* Изменено с height: 100% */
    align-self: stretch; /* Добавлено */
    box-sizing: border-box;
    word-wrap: break-word;
}

.chat-input button:hover {
    background-color: #00CED1;
}

@media (max-width: 768px) {
    .chat-input input,
    .chat-input button {
        font-size: 0.9em;
    }
}

.message {
    position: relative;
    padding: 12px 20px;
    margin-bottom: 15px;
    max-width: 80%;
    word-wrap: break-word;
    word-break: break-word;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: background-color var(--transition-duration), border-color var(--transition-duration), color var(--transition-duration), box-shadow var(--transition-duration);
    opacity: 0;
    transform: translateY(10px);
    display: inline-block;
}

.message.show {
    opacity: 1;
    transform: translateY(0);
    animation: fadeInUp 0.3s ease forwards;
}

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

.message.user,
.message.user.admin,
.message.user.current {
    background: var(--message-bg-user);
    border: 1px solid var(--turquoise);
    color: var(--chat-message-text);
    font-family: var(--font-primary);
    overflow-wrap: break-word;
    word-break: break-word;
    word-wrap: break-word;
}

html:not(.dark-theme) .message.user,
html:not(.dark-theme) .message.user.admin,
html:not(.dark-theme) .message.user.current {
    background: linear-gradient(135deg, #e8f4f8, #d0f0f7);
}

html.dark-theme .message.user,
html.dark-theme .message.user.admin,
html.dark-theme .message.user.current {
    background: linear-gradient(135deg, #4A4A4A, #3B3B3B);
}

.message.user.current {
    align-self: flex-end;
    border-radius: 15px 15px 0 15px;
}

.message.user,
.message.user.admin {
    align-self: flex-start;
    border-radius: 15px 15px 15px 0;
}

.participants-container {
    width: 250px;
    background-color: var(--input-bg);
    border-left: 1px solid var(--input-border);
    padding: 20px;
    box-sizing: border-box;
    overflow-y: auto;
    font-family: var(--font-secondary);
    transition: background-color var(--transition-duration), border-color var(--transition-duration);
}

html.dark-theme .participants-container {
    background-color: #2C2C2C;
    color: var(--white);
    border-color: #555555;
}

.participants-container h4 {
    margin-top: 0;
    color: var(--text-color);
    font-size: 1.2em;
}

.participant-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.participant-list li {
    padding: 8px;
    border-bottom: 1px solid var(--input-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-color);
    font-size: 1em;
    overflow-wrap: break-word;
    word-wrap: break-word;
    transition: background-color var(--transition-duration), color var(--transition-duration);
}

.participant-list li, .message strong {
    word-wrap: break-word;
    word-break: break-word;
    max-width: 100%;
    overflow-wrap: break-word;
    hyphens: auto;
}

html.dark-theme .participant-list li {
    border-color: #777777;
    color: var(--text-color);
}

.participant-list li.admin {
    font-weight: bold;
    color: var(--red);
}

html.dark-theme .participant-list li.admin {
    color: #FFA07A;
}

@media (max-width: 1200px) {
    .sidebar,
    .participants-container {
        width: 200px;
    }
}

@media (max-width: 992px) {
    .sidebar,
    .participants-container {
        width: 150px;
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar,
    .participants-container {
        width: 100%;
        border: none;
    }

    .participants-container {
        border-top: 1px solid var(--input-border);
    }

    .chat-container {
        background-color: var(--input-bg);
        padding: 10px;
    }

    .chat-input input,
    .chat-input button {
        font-size: 0.9em;
    }

    .message.user,
    .message.user.current {
        max-width: 90%;
    }

    .lobby-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .chat-header h3 {
        font-size: 1em;
    }

    .chat-header-buttons button {
        font-size: 0.9em;
        padding: 8px 12px;
    }

    .participants-container h4 {
        font-size: 1em;
    }

    .participant-list li {
        font-size: 0.9em;
    }
}

@media (max-width: 600px) {
    .chat-header-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

    .chat-messages {
        padding: 5px;
    }

    .chat-input input {
        padding: 8px;
    }

    .chat-input button {
        padding: 8px 12px;
    }

    .create-lobby-form {
        width: 100%;
        max-width: 100%;
    }

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

@media (max-width: 480px) {
    header h2.logo {
        font-size: 1.5em;
    }

    .header-buttons {
        flex-direction: column;
        align-items: flex-start;
    }

    .theme-toggle-container {
        margin-bottom: 10px;
    }

    .chat-header-buttons button {
        font-size: 0.8em;
        padding: 6px 10px;
    }

    .chat-input input,
    .chat-input button {
        font-size: 0.8em;
    }
}

a {
    color: var(--turquoise);
    text-decoration: none;
    transition: color var(--transition-duration);
}

a:hover {
    color: #00CED1;
}

::-webkit-scrollbar {
    width: 8px;
}

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

::-webkit-scrollbar-thumb {
    background-color: var(--scrollbar-thumb);
    border-radius: 4px;
    border: 2px solid var(--scrollbar-track);
}

.container.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    position: relative;
    flex-direction: column;
    padding: 20px;
    box-sizing: border-box;
}

.container.auth-container form {
    width: 100%;
    max-width: 400px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    background-color: var(--input-bg);
    margin-bottom: 20px;
}

.container.auth-container p {
    font-size: 1em;
    text-align: center;
    color: var(--text-color);
    font-family: var(--font-secondary);
    word-wrap: break-word;
}

.container.auth-container p a {
    color: var(--turquoise);
    text-decoration: none;
}

.container.auth-container p a:hover {
    color: #00CED1;
}

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

.container.auth-container form h2.logo {
    font-family: var(--font-logo);
    font-size: 2em;
    margin-bottom: 20px;
    text-align: center;
    color: var(--text-color);
}

.message-timestamp {
    font-size: 0.8em;
    color: inherit;
}