:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f0f2f5;
    --bg-tertiary: #f0f2f5;
    --bg-hover: #e4e6e9;
    --bg-active: #e8f0fe;
    --bg-input: #f0f2f5;
    --bg-modal: #ffffff;
    --bg-overlay: rgba(0, 0, 0, 0.4);
    --bg-drop: rgba(0, 136, 204, 0.08);
    --bg-reply: #e8f0fe;
    --bg-reply-own: rgba(0, 136, 204, 0.08);
    --bg-attachment: #e8f5e9;
    --bg-message-menu: #ffffff;
    --bg-message-own: #e3f2fd;
    --bg-user-count: #e4e6e9;
    --text-primary: #1a1a1a;
    --text-secondary: #65676b;
    --text-muted: #8a8d91;
    --text-light: #8a8d91;
    --text-inverse: #ffffff;
    --text-link: #0088cc;
    --border-primary: #e4e6e9;
    --border-light: #f0f2f5;
    --border-focus: #0088cc;
    --accent-blue: #0088cc;
    --accent-blue-hover: #006699;
    --accent-blue-light: rgba(0, 136, 204, 0.1);
    --accent-green-hover: #388e3c;
    --accent-green-light: rgba(76, 175, 80, 0.1);
    --accent-red-light: rgba(244, 67, 54, 0.1);
    --accent-yellow: #ffc107;
    --accent-cyan: #00acc1;
    --accent-cyan-hover: #00838f;
    --accent-gray: #8a8d91;
    --accent-gray-hover: #65676b;
    --accent-gray-light: #65676b;
    --header-bg: #0088cc;
    --header-text: #ffffff;
    --user-block-bg: rgba(255, 255, 255, 0.1);
    --user-block-bg-hover: rgba(255, 255, 255, 0.25);
    --user-block-border: rgba(255, 255, 255, 0.3);
    --user-block-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-round: 50%;
    --radius-input: 24px;
    --transition-fast: 0.15s;
    --transition-normal: 0.2s;
    --transition-slow: 0.3s
}

[data-theme=dark] {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #1f1f1f;
    --bg-hover: #2a2a2a;
    --bg-active: #1a3a5c;
    --bg-input: #1f1f1f;
    --bg-modal: #1a1a1a;
    --bg-overlay: rgba(0, 0, 0, 0.7);
    --bg-drop: rgba(0, 136, 204, 0.15);
    --bg-reply: #1a2a3c;
    --bg-reply-own: rgba(77, 163, 255, 0.12);
    --bg-attachment: #1a2a1a;
    --bg-message-menu: #1f1f1f;
    --bg-message-own: #1a2a3c;
    --bg-user-count: #2a2a2a;
    --text-primary: #e4e6eb;
    --text-secondary: #b0b3b8;
    --text-muted: #6b6e73;
    --text-light: #6b6e73;
    --text-inverse: #0f0f0f;
    --text-link: #4da3ff;
    --border-primary: #2a2a2a;
    --border-light: #1f1f1f;
    --border-focus: #4da3ff;
    --accent-blue: #4da3ff;
    --accent-blue-hover: #3d8be0;
    --accent-blue-light: rgba(77, 163, 255, 0.12);
    --accent-green-hover: #3d8b40;
    --accent-green-light: rgba(76, 175, 80, 0.12);
    --accent-red-light: rgba(244, 67, 54, 0.12);
    --header-bg: #1a1a2e;
    --user-block-bg: rgba(0, 0, 0, 0.2);
    --user-block-bg-hover: rgb(0 0 0 / 41%);
    --user-block-border: rgba(255, 255, 255, 0.15);
    --user-block-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5)
}

:root, [data-theme=dark] {
    --accent-green: #4caf50;
    --accent-red: #f44336;
    --accent-red-hover: #d32f2f
}

*, hr {
    margin: 0
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-secondary);
    transition: background-color var(--transition-slow), color var(--transition-slow);
    font-size: 14px;
    line-height: 1.4
}

.auth-action-btn, .header, .theme-toggle-btn {
    color: var(--header-text)
}

.left h2, .room-header h2, .search-wrapper input, body {
    color: var(--text-primary)
}

.message, .right {
    position: relative
}

.file-caption, .file-document, .message-text {
    word-break: break-word
}

.input-wrapper input, .modal input, .search-wrapper input {
    background-color: var(--bg-input);
    transition: border-color var(--transition-normal)
}

.header {
    background-color: var(--header-bg);
    padding: 10px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    z-index: 100
}

.header-right {
    display: flex;
    gap: 12px
}

.icon-block {
    font-weight: 600;
    font-size: 16px;
    letter-spacing: -.3px
}

.auth-action-btn, .user-block {
    font-weight: 500;
    cursor: pointer
}

.user-block {
    padding: 6px 14px;
    border-radius: var(--radius-input);
    border: 1.5px solid var(--user-block-border);
    background: var(--user-block-bg);
    font-size: 13px;
    transition: background-color var(--transition-slow)
}

.user-block:hover {
    background: var(--user-block-bg-hover)
}

.theme-toggle-btn {
    width: 34px;
    height: 34px;
    border: 1.5px solid rgba(255, 255, 255, .3);
    border-radius: var(--radius-round);
    background: 0 0;
    cursor: pointer;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-normal)
}

.auth-action-btn, .theme-toggle-btn:hover {
    background: rgba(255, 255, 255, .15)
}

.auth-action-btn {
    border: 1.5px solid rgba(255, 255, 255, .3);
    border-radius: var(--radius-input);
    padding: 6px 16px;
    font-size: 13px;
    transition: background-color var(--transition-slow)
}

.auth-action-btn:hover {
    background: rgba(255, 255, 255, .25)
}

.content {
    display: flex;
    flex: 1;
    overflow: hidden;
    gap: 0
}

.left {
    width: 280px;
    background-color: var(--bg-primary);
    padding: 16px;
    border-right: 1px solid var(--border-primary);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px
}

.left h2 {
    margin-bottom: 4px;
    font-size: 18px;
    font-weight: 600
}

.search-block {
    margin-bottom: 0;
    width: 100%
}

.search-wrapper {
    display: flex;
    gap: 0;
    width: 100%
}

.search-wrapper input {
    flex: 1;
    padding: 8px 12px;
    border: 1.5px solid var(--border-primary);
    border-right: none;
    border-radius: var(--radius-input) 0 0 var(--radius-input);
    outline: 0;
    font-size: 13px
}

.search-wrapper input:focus {
    border-color: var(--border-focus)
}

.search-mode-btn {
    width: 38px;
    min-width: 38px;
    height: 38px;
    border: 1.5px solid var(--border-primary);
    border-radius: 0 var(--radius-input) var(--radius-input) 0;
    background: var(--bg-input);
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal)
}

.file-upload-btn:hover, .search-mode-btn:hover {
    background: var(--bg-hover);
    color: var(--accent-blue);
    border-color: var(--accent-blue)
}

.create-room-btn {
    width: 100%;
    padding: 10px;
    background-color: var(--accent-blue);
    color: var(--text-inverse);
    border: none;
    border-radius: var(--radius-input);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: background-color var(--transition-slow), transform var(--transition-fast)
}

.create-room-btn:hover {
    background-color: var(--accent-blue-hover);
    transform: scale(1.01)
}

.room-section-header {
    padding: 10px 8px 4px;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .5px
}

.room {
    padding: 10px 12px;
    margin-bottom: 2px;
    background-color: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background-color var(--transition-fast)
}

.message:hover, .room:hover {
    background-color: var(--bg-hover)
}

.room.active {
    background-color: var(--bg-active)
}

.room-color-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-round);
    flex-shrink: 0;
    box-shadow: 0 0 0 2px rgba(0, 0, 0, .05)
}

.room>div {
    flex: 1;
    min-width: 0
}

.room-title {
    font-size: 14px;
    font-weight: 500;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap
}

.room-subtitle, .user-count {
    font-size: 11px;
    color: var(--text-muted)
}

.room-subtitle {
    margin-top: 1px
}

.user-count {
    background: var(--bg-user-count);
    border-radius: 10px;
    padding: 2px 8px;
    flex-shrink: 0;
    font-weight: 500
}

.edit-room-btn, .users-btn {
    border-radius: var(--radius-input);
    transition: background-color var(--transition-slow)
}

.right {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-primary)
}

.room-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-primary)
}

.room-header h2 {
    margin-bottom: 0;
    font-size: 16px;
    font-weight: 600
}

.modal-buttons, .room-header-actions {
    display: flex;
    gap: 8px
}

.room-creator {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px
}

.edit-room-btn {
    background-color: var(--accent-blue-light);
    color: var(--accent-blue)
}

#login-btn-modal, #save-profile-btn, #save-room-btn, .btn-primary, .edit-room-btn:hover {
    background-color: var(--accent-blue);
    color: var(--text-inverse)
}

.users-btn {
    background-color: var(--accent-green-light);
    color: var(--accent-green)
}

#register-btn-modal, .btn-success, .users-btn:hover {
    background-color: var(--accent-green);
    color: var(--text-inverse)
}

.edit-room-btn, .leave-room-btn, .users-btn {
    padding: 6px 14px;
    border: none;
    border-radius: var(--radius-input);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    transition: background-color var(--transition-slow)
}

.leave-room-btn {
    background-color: transparent;
    color: var(--accent-red);
    border: 1.5px solid var(--accent-red)
}

.btn-danger, .leave-room-btn:hover {
    background-color: var(--accent-red);
    color: var(--text-inverse)
}

#login-btn-modal:hover, #save-profile-btn:hover, #save-room-btn:hover, .btn-primary:hover, .send-button:hover {
    background-color: var(--accent-blue-hover)
}

.message-mine .reply-quote {
    background: var(--bg-reply-own)
}

.right-content {
    flex: 1;
    overflow-y: auto;
    padding: 16px 20px;
    display: flex;
    flex-direction: column;
    gap: 4px
}

.right-content.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 15px;
    text-align: center
}

.message-menu-btn, .nickname {
    display: flex;
    align-items: center
}

.right-content.empty-state p {
    max-width: 400px;
    line-height: 1.5
}

.message {
    padding: 8px 12px;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    border-left: none;
    max-width: 70%;
    transition: background-color var(--transition-fast)
}

.message-mine, .message-mine:hover {
    background-color: var(--bg-message-own)
}

.message-mine {
    margin-left: auto;
    border-radius: var(--radius-md) 4px var(--radius-md) var(--radius-md)
}

.message-mine:hover {
    filter: brightness(.97)
}

.message:not(.message-mine) {
    border-radius: 4px var(--radius-md) var(--radius-md) var(--radius-md)
}

.system-message {
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    font-style: normal;
    margin: 8px 0;
    padding: 4px 0
}

.nickname {
    font-weight: 600;
    font-size: 13px
}

.nickname .admin-shield {
    margin-left: 5px
}

.admin-shield {
    color: var(--accent-yellow);
    font-size: 12px
}

.msg-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2px
}

.msg-time {
    font-size: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
    margin-left: 12px
}

.input-wrapper input, .message-text {
    font-size: 14px;
    color: var(--text-primary)
}

.msg-body {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 6px
}

.message-text {
    flex: 1;
    line-height: 1.45
}

.message-menu {
    position: absolute;
    top: -20px;
    right: 0;
    display: none;
    background: var(--bg-message-menu);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    z-index: 10;
    overflow: hidden
}

.drop-overlay.active, .message:hover .message-menu {
    display: flex
}

.message-menu-btn {
    padding: 6px 10px;
    background: 0 0;
    border: none;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition-normal);
    gap: 4px
}

.file-upload-btn, .input-block {
    align-items: center;
    display: flex
}

.message-menu-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary)
}

.message-menu-btn.reply-btn {
    color: var(--accent-blue)
}

.message-menu-btn.reply-btn:hover {
    background-color: var(--bg-reply)
}

.char-counter.warning, .message-menu-btn.delete-btn {
    color: var(--accent-red)
}

.message-menu-btn.delete-btn:hover {
    background-color: #fff5f5
}

.message-menu-separator {
    width: 1px;
    background-color: var(--border-primary)
}

.input-block {
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--border-primary);
    background: var(--bg-primary)
}

.input-wrapper {
    flex: 1;
    position: relative
}

.input-wrapper input {
    width: 100%;
    height: 42px;
    padding: 10px 70px 10px 16px;
    border: 1.5px solid var(--border-primary);
    border-radius: var(--radius-input);
    outline: 0
}

.input-wrapper input:focus {
    border-color: var(--accent-blue)
}

.char-counter {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 11px;
    color: var(--text-muted);
    pointer-events: none;
    background: 0 0
}

.send-button {
    background-color: var(--accent-blue);
    color: var(--text-inverse);
    padding: 10px 20px;
    border-radius: var(--radius-input);
    cursor: pointer;
    transition: background-color var(--transition-slow), opacity var(--transition-slow);
    white-space: nowrap;
    font-weight: 500;
    font-size: 14px;
    border: none
}

.send-button.disabled, .send-button:disabled {
    opacity: .5;
    pointer-events: none
}

.file-upload-btn {
    width: 42px;
    height: 42px;
    min-width: 42px;
    border: 1.5px solid var(--border-primary);
    border-radius: var(--radius-round);
    background: 0 0;
    cursor: pointer;
    justify-content: center;
    font-size: 18px;
    color: var(--text-secondary);
    transition: var(--transition-normal)
}

.file-document, .file-image, .file-video {
    border-radius: var(--radius-md);
    margin-top: 5px
}

.file-message {
    max-width: 400px;
    min-width: 200px
}

.file-image {
    max-width: 100%;
    max-height: 300px;
    transition: transform var(--transition-normal);
    object-fit: contain;
    cursor: pointer
}

.file-video {
    width: 100%;
    max-width: 400px;
    max-height: 300px
}

.file-audio {
    width: 100%;
    min-width: 250px;
    margin-top: 5px
}

.attachment-info, .reply-block span {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap
}

.file-document {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border-primary);
    text-decoration: none;
    color: var(--text-primary);
    transition: background-color var(--transition-fast)
}

.file-document:hover, .reply-quote:hover {
    background: var(--bg-hover)
}

.file-document i {
    font-size: 22px;
    color: var(--accent-blue);
    flex-shrink: 0
}

.file-media-name {
    font-size: 12px;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 100%
}

.file-caption {
    margin-top: 6px;
    color: var(--text-primary);
    font-size: 14px
}

.file-media-wrapper {
    display: flex;
    flex-direction: column;
    gap: 4px
}

.reply-block {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background: var(--bg-reply);
    border-bottom: 1px solid var(--border-primary);
    font-size: 13px;
    color: var(--text-primary)
}

.reply-block span {
    flex: 1
}

.cancel-attachment-btn, .cancel-reply-btn {
    width: 24px;
    height: 24px;
    border: none;
    background: 0 0;
    cursor: pointer;
    font-size: 16px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-left: 8px;
    border-radius: var(--radius-round);
    transition: var(--transition-normal)
}

.cancel-attachment-btn:hover, .cancel-reply-btn:hover {
    background: rgba(244, 67, 54, .1);
    color: var(--accent-red)
}

.reply-quote.deleted, .reply-quote.deleted i {
    color: var(--text-muted)
}

.attachment-preview {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    background: var(--bg-attachment);
    border-bottom: 1px solid var(--border-primary);
    font-size: 13px;
    color: var(--text-primary)
}

.attachment-info {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1
}

.attachment-info i {
    color: var(--accent-green);
    font-size: 16px;
    flex-shrink: 0
}

.attachment-preview img {
    max-height: 36px;
    max-width: 36px;
    border-radius: var(--radius-sm);
    object-fit: cover
}

.reply-quote {
    display: block;
    font-size: 12px;
    color: var(--accent-gray);
    margin-bottom: 4px;
    padding: 4px 8px;
    background: var(--bg-reply);
    border-radius: var(--radius-sm);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    text-decoration: none;
    cursor: pointer;
    transition: background-color var(--transition-fast);
    border-left: 3px solid var(--accent-blue)
}

.message-mine .reply-quote {
    background: rgba(0, 136, 204, .08)
}

[data-theme=dark] .message-mine .reply-quote {
    background: rgba(77, 163, 255, .12)
}

.reply-quote i {
    margin-right: 4px;
    color: var(--accent-blue)
}

.reply-quote.deleted {
    cursor: default;
    border-left-color: var(--text-muted)
}

.reply-quote.deleted:hover {
    background: var(--bg-reply)
}

.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--bg-modal);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    min-width: 380px;
    animation: .2s modalIn
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: translate(-50%, -50%) scale(.95)
    }

    to {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1)
    }
}

.modal-content {
    padding: 24px
}

.modal h2 {
    margin-bottom: 16px;
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600
}

.modal p {
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 13px
}

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

.modal input {
    width: 100%;
    padding: 10px 14px;
    margin-bottom: 10px;
    border: 1.5px solid var(--border-primary);
    border-radius: var(--radius-sm);
    font-size: 14px
}

.full-width-btn, .modal-buttons button {
    padding: 10px;
    font-size: 14px;
    font-weight: 500;
    transition: background-color var(--transition-slow);
    cursor: pointer
}

.modal input:focus {
    outline: 0;
    border-color: var(--accent-blue)
}

.modal-buttons button {
    flex: 1;
    border: none;
    border-radius: var(--radius-sm)
}

.full-width-btn {
    width: 100%;
    margin-top: 8px;
    border: none;
    border-radius: var(--radius-sm)
}

#register-btn-modal:hover, .btn-success:hover {
    background-color: var(--accent-green-hover)
}

#guest-btn, .btn-secondary {
    background-color: var(--accent-gray);
    color: var(--text-inverse)
}

#guest-btn:hover, .btn-secondary:hover {
    background-color: var(--accent-gray-light)
}

.btn-danger:hover {
    background-color: var(--accent-red-hover)
}

.btn-info {
    background-color: var(--accent-cyan);
    color: var(--text-inverse)
}

.btn-info:hover {
    background-color: var(--accent-cyan-hover)
}

.close-modal {
    position: absolute;
    top: 12px;
    right: 16px;
    font-size: 20px;
    cursor: pointer;
    color: var(--text-muted)
}

.drop-overlay, .modal-overlay {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0
}

.modal-overlay {
    display: none;
    position: fixed;
    background: var(--bg-overlay);
    z-index: 1000
}

.color-picker {
    display: flex;
    gap: 8px;
    margin-bottom: 14px;
    flex-wrap: wrap
}

.color-option {
    width: 30px;
    height: 30px;
    border-radius: var(--radius-round);
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform var(--transition-fast)
}

.color-option:hover {
    transform: scale(1.2)
}

.color-option.selected {
    border-color: var(--text-primary);
    box-shadow: 0 0 0 2px var(--bg-primary), 0 0 0 4px var(--text-primary)
}

#users-list {
    max-height: 300px;
    overflow-y: auto
}

.user-item {
    padding: 10px 0;
    border-bottom: 1px solid var(--border-light)
}

.user-item:last-child {
    border-bottom: none
}

hr {
    border: none;
    border-top: 1px solid var(--border-primary)
}

.drop-overlay {
    display: none;
    position: absolute;
    background: var(--bg-drop);
    border: 3px dashed var(--accent-blue);
    border-radius: var(--radius-lg);
    z-index: 999;
    pointer-events: none;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--accent-blue);
    font-weight: 600
}


@media (max-width: 768px) {
    .content {
        position: relative;
    }

    .left {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        width: 85vw;
        max-width: 320px;
        z-index: 200;
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-lg);
        padding: 16px;
    }

    .left.mobile-visible {
        left: 0;
    }

    .mobile-sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--bg-overlay);
        z-index: 199;
    }

    .mobile-sidebar-overlay.active {
        display: block;
    }

    .right {
        width: 100%;
    }

    .mobile-menu-btn {
        position: absolute;
        align-items: center;
        justify-content: center;
        width: 34px;
        height: 34px;
        background: transparent;
        border: 1.5px solid rgba(255, 255, 255, 0.3);
        border-radius: var(--radius-round);
        color: var(--header-text);
        cursor: pointer;
        font-size: 16px;
        transition: background-color var(--transition-normal);
    }

    .mobile-menu-btn:hover {
        background: rgba(255, 255, 255, 0.15);
    }

    .header {
        padding: 8px 12px;
        gap: 8px;
    }

    .header-right {
        gap: 6px;
        align-items: center;
    }

    .icon-block {
        padding-left: 50px;
        font-size: 14px;
        flex-shrink: 0;
    }

    .user-block {
        padding: 5px 8px;
        font-size: 12px;
        max-width: 100px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .auth-action-btn {
        padding: 5px 10px;
        font-size: 12px;
    }

    .theme-toggle-btn {
        width: 30px;
        height: 30px;
        min-width: 30px;
        font-size: 14px;
    }

    .search-wrapper input {
        padding: 8px 10px;
        font-size: 13px;
    }

    .search-mode-btn {
        width: 34px;
        min-width: 34px;
        height: 36px;
        font-size: 13px;
    }

    .create-room-btn {
        font-size: 13px;
    }

    .room-header {
        padding: 10px 12px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .room-header h2 {
        font-size: 15px;
    }

    .room-header-actions {
        gap: 4px;
        flex-wrap: wrap;
    }

    .room-header-actions button {
        font-size: 12px;
        padding: 4px 10px;
        white-space: nowrap;
    }

    .room-creator {
        font-size: 11px;
    }

    .right-content {
        padding: 12px 14px;
        gap: 3px;
    }

    .message {
        max-width: 85%;
        padding: 7px 10px;
    }

    .message-text {
        font-size: 14px;
    }

    .nickname {
        font-size: 12px;
    }

    .msg-time {
        font-size: 10px;
        margin-left: 8px;
    }

    .system-message {
        font-size: 11px;
        margin: 6px 0;
    }

    .message-menu {
        top: -28px;
        right: -5px;
    }

    .message-menu-btn {
        padding: 5px 8px;
        font-size: 12px;
    }

    .input-block {
        padding: 10px 12px;
        gap: 6px;
    }

    .input-wrapper input {
        height: 40px;
        padding: 8px 65px 8px 14px;
        font-size: 14px;
    }

    .char-counter {
        right: 12px;
        font-size: 10px;
    }

    .send-button {
        padding: 9px 16px;
        font-size: 13px;
        border-radius: var(--radius-input);
    }

    .file-upload-btn {
        width: 40px;
        height: 40px;
        min-width: 40px;
        font-size: 17px;
    }

    .file-message {
        max-width: 100%;
        min-width: 180px;
    }

    .file-image {
        max-height: 250px;
    }

    .file-video {
        max-height: 250px;
        max-width: 100%;
    }

    .file-audio {
        min-width: 220px;
    }

    .reply-block,
    .attachment-preview {
        padding: 7px 12px;
        font-size: 13px;
    }

    .reply-quote {
        font-size: 11px;
        padding: 3px 7px;
    }

    .modal {
        min-width: 90vw;
        border-radius: var(--radius-md);
    }

    .modal-content {
        padding: 20px;
    }

    .modal h2 {
        font-size: 17px;
    }

    .modal input {
        font-size: 14px;
    }

    .modal-buttons {
        flex-direction: column;
        gap: 6px;
    }

    .modal-buttons button,
    .full-width-btn {
        padding: 10px;
        font-size: 14px;
    }

    .close-modal {
        top: 10px;
        right: 14px;
        font-size: 18px;
    }

    .color-picker {
        gap: 6px;
    }

    .color-option {
        width: 28px;
        height: 28px;
    }

    #users-list {
        max-height: 250px;
    }

    .user-item {
        padding: 8px 0;
        font-size: 13px;
    }

    .drop-overlay {
        font-size: 15px;
    }

    .right-content.empty-state {
        font-size: 14px;
        padding: 24px;
    }
}

@media (max-width: 400px) {
    .header {
        padding: 6px 8px;
    }

    .icon-block {
        font-size: 13px;
    }

    .header-right {
        gap: 4px;
    }

    .theme-toggle-btn {
        width: 28px;
        height: 28px;
        min-width: 28px;
        font-size: 13px;
    }

    .user-block {
        padding: 4px 6px;
        font-size: 11px;
        max-width: 70px;
    }

    .auth-action-btn {
        padding: 4px 7px;
        font-size: 11px;
    }

    .message {
        max-width: 92%;
        padding: 6px 8px;
    }

    .message-text {
        font-size: 13px;
    }

    .send-button {
        padding: 7px 12px;
        font-size: 12px;
    }

    .input-wrapper input {
        height: 38px;
        font-size: 13px;
    }

    .file-upload-btn {
        width: 36px;
        height: 36px;
        min-width: 36px;
        font-size: 15px;
    }

    .room-header h2 {
        font-size: 14px;
    }

    .room-header-actions button {
        font-size: 11px;
        padding: 3px 8px;
    }

    .modal-content {
        padding: 16px;
    }

    .modal h2 {
        font-size: 15px;
    }
}