:root {
    /* Telegram цвета */
    --tg-blue: #0088cc;
    --tg-blue-hover: #006699;
    --tg-blue-light: #e3f2fd;
    --tg-green: #4caf50;
    --tg-bg: #ffffff;
    --tg-sidebar-bg: #f4f4f5;
    --tg-chat-bg: #e4dfd9;
    --tg-message-in: #ffffff;
    --tg-message-out: #dcf8c6;
    --tg-text: #000000;
    --tg-text-secondary: #707579;
    --tg-border: #dadce0;
    --tg-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    --tg-shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.15);
    --transition: all 0.2s ease;
}

/* Отключаем горизонтальную прокрутку и жест назад */
html, body {
    overflow-x: hidden;
    overscroll-behavior-x: none;
    touch-action: pan-y pinch-zoom;
    max-width: 100vw;
}

/* Стилизация скроллбара в стиле Telegram */
.chat-messages::-webkit-scrollbar,
.chat-sidebar::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track,
.chat-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb,
.chat-sidebar::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover,
.chat-sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

.chat-container {
    display: flex;
    height: 100%;
    background: var(--tg-bg);
    overflow: hidden;
    max-width: 100%;
    margin: 0;
    box-shadow: none;
}

.chat-sidebar {
    width: 320px;
    min-width: 280px;
    background: var(--tg-sidebar-bg);
    border-right: 1px solid var(--tg-border);
    overflow-y: auto;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.chat-sidebar h3 {
    padding: 1.2rem 1.5rem;
    background: var(--tg-blue);
    color: white;
    margin: 0;
    font-weight: 500;
    font-size: clamp(0.95rem, 2vw, 1.1rem);
    letter-spacing: 0.3px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

#usersList {
    padding: 0;
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

/* Стилизация скроллбара для списка пользователей */
#usersList::-webkit-scrollbar {
    width: 6px;
}

#usersList::-webkit-scrollbar-track {
    background: transparent;
}

#usersList::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

#usersList::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

.user-item {
    padding: 0.9rem 1.2rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.9rem;
    background: var(--tg-bg);
    position: relative;
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 500;
    font-size: 1.2rem;
    flex-shrink: 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--tg-text);
    margin-bottom: 0.2rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-status {
    font-size: 0.8rem;
    color: var(--tg-text-secondary);
}

.user-item:hover {
    background: #f0f0f0;
}

.user-item.active {
    background: var(--tg-blue-light);
    border-left: 3px solid var(--tg-blue);
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
    background: var(--tg-chat-bg);
}

.chat-header {
    background: var(--tg-blue);
    padding: 1rem 1.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 10;
    gap: 0.8rem;
}

.chat-header h3 {
    margin: 0;
    color: white;
    font-weight: 500;
    font-size: 1.1rem;
    letter-spacing: 0.3px;
    flex: 1;
}

.btn-toggle-sidebar {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    padding: 0.5rem 0.8rem;
    cursor: pointer;
    font-size: 1.2rem;
    transition: var(--transition);
    display: none;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.btn-toggle-sidebar:hover {
    background: rgba(255, 255, 255, 0.3);
}

.btn-toggle-sidebar:active {
    transform: scale(0.95);
}

.btn-clear {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 8px 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    font-weight: 400;
}

.btn-clear:hover {
    background: rgba(255, 255, 255, 0.3);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1.5rem;
    background: var(--tg-chat-bg);
    background-image: 
        repeating-linear-gradient(
            45deg,
            transparent,
            transparent 10px,
            rgba(255, 255, 255, 0.03) 10px,
            rgba(255, 255, 255, 0.03) 20px
        );
    -webkit-overflow-scrolling: touch;
}

.message {
    margin-bottom: 0.8rem;
    display: flex;
    flex-direction: column;
    animation: messageSlide 0.2s ease;
}

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

.message.own {
    align-items: flex-end;
}

.message-header {
    font-size: 0.8rem;
    color: var(--tg-text-secondary);
    margin-bottom: 0.25rem;
    padding: 0 0.5rem;
    font-weight: 500;
}

.message-content {
    max-width: 65%;
    padding: 0.6rem 0.9rem 0.4rem 0.9rem;
    border-radius: 12px;
    background: var(--tg-message-in);
    box-shadow: var(--tg-shadow);
    word-wrap: break-word;
    overflow-wrap: break-word;
    position: relative;
    line-height: 1.4;
    font-size: 0.95rem;
}

.message-content::before {
    content: '';
    position: absolute;
    width: 0;
    height: 0;
    border-style: solid;
}

.message:not(.own) .message-content::before {
    left: -8px;
    top: 0;
    border-width: 0 8px 8px 0;
    border-color: transparent var(--tg-message-in) transparent transparent;
}

.message.own .message-content {
    background: var(--tg-message-out);
    color: var(--tg-text);
}

.message.own .message-content::before {
    right: -8px;
    top: 0;
    border-width: 0 0 8px 8px;
    border-color: transparent transparent var(--tg-message-out) transparent;
}

.message-image {
    max-width: 100%;
    max-height: 300px;
    border-radius: 8px;
    margin-top: 0.4rem;
    margin-bottom: 0.3rem;
    display: block;
}

.message-time {
    font-size: 0.7rem;
    color: var(--tg-text-secondary);
    text-align: right;
    opacity: 0.7;
    margin-top: 0.2rem;
    user-select: none;
}

.message-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.3rem;
    margin-top: 0.2rem;
}

.read-status {
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    user-select: none;
}

.read-status.unread {
    color: var(--tg-text-secondary);
    opacity: 0.6;
}

.read-status.read {
    color: var(--tg-blue);
    font-weight: 600;
}

.message.own .message-content .read-status.read {
    color: #4caf50;
}

.chat-input {
    background: var(--tg-bg);
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--tg-border);
    box-shadow: 0 -2px 4px rgba(0, 0, 0, 0.05);
}

#messageForm {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

#messageText {
    flex: 1;
    padding: 11px 16px;
    border: 1px solid var(--tg-border);
    border-radius: 22px;
    font-size: 0.95rem;
    min-width: 0;
    transition: var(--transition);
    background: var(--tg-bg);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

#messageText:focus {
    outline: none;
    border-color: var(--tg-blue);
    box-shadow: 0 0 0 2px rgba(0, 136, 204, 0.1);
}

.btn-upload {
    background: transparent;
    padding: 10px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.4rem;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    color: var(--tg-text-secondary);
    width: 40px;
    height: 40px;
}

.btn-upload:hover {
    background: rgba(0, 0, 0, 0.05);
}

.btn-upload:active {
    transform: scale(0.9);
}

.btn-send {
    background: var(--tg-blue);
    color: white;
    padding: 0;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
    white-space: nowrap;
    flex-shrink: 0;
    font-weight: 400;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-send:hover {
    background: var(--tg-blue-hover);
}

.btn-send:active {
    transform: scale(0.9);
}

#imagePreview {
    margin-top: 0.8rem;
    position: relative;
    display: inline-block;
}

#imagePreview img {
    max-width: 200px;
    max-height: 150px;
    border-radius: 8px;
    box-shadow: var(--tg-shadow);
    border: 1px solid var(--tg-border);
}

.remove-preview {
    position: absolute;
    top: -8px;
    right: -8px;
    background: #ff4444;
    color: white;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.9rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
}

.remove-preview:hover {
    background: #cc0000;
    transform: scale(1.1);
}

/* Адаптация для средних экранов и увеличенного масштаба */
@media (max-width: 1024px) {
    .chat-sidebar {
        width: 260px;
        min-width: 240px;
    }
    
    .chat-sidebar h3 {
        padding: 1rem 1.2rem;
        font-size: 1rem;
    }
    
    .user-item {
        padding: 0.8rem 1rem;
    }
    
    .user-avatar {
        width: 42px;
        height: 42px;
        font-size: 1.1rem;
    }
    
    .user-name {
        font-size: 0.9rem;
    }
    
    .user-status {
        font-size: 0.75rem;
    }
}

@media (max-width: 900px) {
    .chat-sidebar {
        width: 240px;
        min-width: 220px;
    }
    
    .chat-sidebar h3 {
        padding: 0.9rem 1rem;
        font-size: 0.95rem;
    }
    
    .user-item {
        padding: 0.7rem 0.9rem;
    }
    
    .user-avatar {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
}

@media (max-width: 768px) {
    .chat-sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        width: 280px;
        z-index: 1000;
        transition: left 0.3s ease;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3);
    }
    
    .chat-sidebar.active {
        left: 0;
    }
    
    .btn-toggle-sidebar {
        display: flex !important;
    }
    
    .chat-header {
        padding: 0.9rem 1.2rem;
    }
    
    .chat-header h3 {
        font-size: 1rem;
    }
    
    .btn-clear {
        padding: 6px 12px;
        font-size: 0.8rem;
    }
    
    .chat-messages {
        padding: 1rem;
    }
    
    .message-content {
        max-width: 80%;
        padding: 0.6rem 0.8rem;
        font-size: 0.9rem;
    }
    
    .chat-input {
        padding: 0.8rem 1rem;
    }
    
    #messageForm {
        gap: 0.5rem;
    }
    
    #messageText {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
    
    .btn-upload,
    .btn-send {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
    }
}

/* Оверлей для закрытия сайдбара */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

@media (max-width: 480px) {
    .chat-header {
        padding: 0.8rem 1rem;
        flex-wrap: wrap;
    }
    
    .chat-header h3 {
        font-size: 0.95rem;
    }
    
    .btn-clear {
        padding: 5px 10px;
        font-size: 0.75rem;
    }
    
    .chat-messages {
        padding: 0.8rem;
    }
    
    .message {
        margin-bottom: 0.7rem;
    }
    
    .message-content {
        max-width: 85%;
        padding: 0.5rem 0.7rem;
        font-size: 0.85rem;
    }
    
    .message-header {
        font-size: 0.75rem;
    }
    
    .message-time {
        font-size: 0.65rem;
    }
    
    .chat-input {
        padding: 0.7rem 0.8rem;
    }
    
    #messageText {
        padding: 9px 12px;
        font-size: 0.85rem;
    }
    
    .btn-upload,
    .btn-send {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }
    
    #imagePreview img {
        max-width: 120px;
        max-height: 100px;
    }
}