:root {
    --bg-primary: #0b141a;
    --bg-secondary: #1f2c33;
    --bg-tertiary: #2a3942;
    --bg-hover: #2e3e48;
    --accent: #00a884;
    --accent-hover: #039b7b;
    --text-primary: #ffffff;
    --text-secondary: #8696a0;
    --text-muted: #667781;
    --border: #3c4a53;
    --sent-message: #005c4b;
    --received-message: #1f2c33;
    --danger: #df4949;
    --danger-bg: rgba(223, 73, 73, 0.15);
    --success: #00a884;
    --warning: #ffc107;
    --shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
    --radius-lg: 30px;
    --radius-md: 12px;
    --radius-sm: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

body {
    background: linear-gradient(145deg, #0b141a 0%, #0c1218 100%);
    color: var(--text-primary);
    min-height: 100vh;
    font-size: 14px;
    line-height: 1.5;
}

/* Контейнеры */
.container {
    max-width: 1200px;
    margin: 0 auto;
    min-height: 100vh;
    background: var(--bg-primary);
    display: flex;
    flex-direction: column;
}

.app-container {
    display: flex;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    background: var(--bg-primary);
    box-shadow: var(--shadow);
}

/* Аутентификация */
.auth-container {
    max-width: 400px;
    width: 100%;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 40px 30px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo-icon {
    font-size: 48px;
    background: var(--accent);
    width: 80px;
    height: 80px;
    line-height: 80px;
    border-radius: 50%;
    margin: 0 auto 15px;
    color: white;
}

.logo h1 {
    color: var(--text-primary);
    font-size: 28px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

/* Формы */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 16px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 16px;
    transition: var(--transition);
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg-hover);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

/* Кнопки */
.btn {
    padding: 16px 24px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 168, 132, 0.2);
}

.btn-block {
    width: 100%;
}

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

.btn-secondary:hover {
    background: var(--bg-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.btn-danger {
    background: var(--danger);
}

.btn-danger:hover {
    background: #c0392b;
}

.btn-sm {
    padding: 10px 16px;
    font-size: 14px;
}

.btn-icon {
    padding: 10px;
    border-radius: 50%;
    width: 40px;
    height: 40px;
}

/* Ссылки */
.auth-link {
    text-align: center;
    margin-top: 25px;
    color: var(--text-secondary);
    font-size: 15px;
}

.auth-link a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
    margin-left: 5px;
}

.auth-link a:hover {
    text-decoration: underline;
}

/* Сообщения об ошибках */
.error-message,
.alert {
    background: var(--danger-bg);
    color: var(--danger);
    padding: 14px;
    border-radius: var(--radius-md);
    margin-bottom: 25px;
    font-size: 14px;
    text-align: center;
    border: 1px solid rgba(223, 73, 73, 0.3);
}

.success-message {
    background: rgba(0, 168, 132, 0.15);
    color: var(--success);
    border-color: rgba(0, 168, 132, 0.3);
}

/* Навигация */
.sidebar {
    width: 380px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

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

/* Шапка */
.header {
    padding: 15px 20px;
    background: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--accent);
}

.avatar-sm {
    width: 35px;
    height: 35px;
}

.avatar-lg {
    width: 120px;
    height: 120px;
}

.user-details h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.user-details p {
    font-size: 13px;
    color: var(--text-secondary);
}

.status {
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin-right: 5px;
}

.status.online {
    background: var(--success);
}

.status.offline {
    background: var(--text-muted);
}

/* Поиск */
.search-bar {
    padding: 10px 15px;
    background: var(--bg-tertiary);
    margin: 10px 15px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-bar input {
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 100%;
    font-size: 15px;
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.search-bar input:focus {
    outline: none;
}

/* Список чатов */
.chats-list {
    flex: 1;
    overflow-y: auto;
    padding: 10px;
}

.chat-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    border: 1px solid transparent;
}

.chat-item:hover {
    background: var(--bg-hover);
    border-color: var(--accent);
    transform: translateX(5px);
}

.chat-item.active {
    background: var(--bg-hover);
    border-color: var(--accent);
}

.chat-avatar {
    position: relative;
    margin-right: 12px;
}

.chat-avatar img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
}

.group-avatar {
    background: linear-gradient(145deg, #00a884, #008f70);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    color: white;
}

.unread-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    width: 22px;
    height: 22px;
    font-size: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    border: 2px solid var(--bg-secondary);
}

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

.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 5px;
}

.chat-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-time {
    font-size: 11px;
    color: var(--text-muted);
}

.chat-preview {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-preview p {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 200px;
}

.chat-badge {
    background: var(--accent);
    color: white;
    border-radius: 12px;
    padding: 2px 8px;
    font-size: 11px;
    font-weight: 600;
}

/* Контейнер чата */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--bg-primary);
}

.chat-header {
    padding: 15px 20px;
    background: var(--bg-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
}

.chat-user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.chat-user-details h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.chat-user-details p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Сообщения */
.messages-container {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: #0e1c26;
    background-image: radial-gradient(circle at 10% 20%, rgba(0, 168, 132, 0.03) 0%, transparent 20%);
}

.message {
    max-width: 65%;
    clear: both;
    animation: messageAppear 0.3s ease-out;
}

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

.message.sent {
    align-self: flex-end;
}

.message.received {
    align-self: flex-start;
}

.message-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 8px;
}

.message.sent .message-wrapper {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    object-fit: cover;
}

.message-bubble {
    padding: 12px 16px;
    border-radius: 18px;
    position: relative;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.message.sent .message-bubble {
    background: var(--sent-message);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.received .message-bubble {
    background: var(--received-message);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.message-content {
    margin-bottom: 4px;
    line-height: 1.5;
}

.message-content p {
    margin: 0;
    white-space: pre-wrap;
}

.message-image {
    max-width: 300px;
    max-height: 300px;
    border-radius: 12px;
    cursor: pointer;
    margin-bottom: 5px;
}

.message-meta {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 5px;
    font-size: 11px;
}

.message.sent .message-meta {
    color: rgba(255, 255, 255, 0.7);
}

.message.received .message-meta {
    color: var(--text-muted);
}

/* Файлы в сообщениях */
.file-message {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    min-width: 250px;
}

.file-icon {
    font-size: 32px;
}

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

.file-name {
    font-weight: 600;
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.file-size {
    font-size: 11px;
    color: var(--text-muted);
}

/* Ввод сообщения */
.message-input {
    padding: 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.input-group {
    display: flex;
    gap: 12px;
    align-items: center;
    background: var(--bg-tertiary);
    border-radius: 24px;
    padding: 8px 12px;
}

.input-group input[type="text"] {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 15px;
}

.input-group input[type="text"]:focus {
    outline: none;
}

.input-group button {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    padding: 8px;
    cursor: pointer;
    transition: var(--transition);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-group button:hover {
    color: var(--accent);
    background: rgba(255, 255, 255, 0.1);
}

.send-btn {
    background: var(--accent) !important;
    color: white !important;
}

.send-btn:hover {
    background: var(--accent-hover) !important;
}

/* Предпросмотр файла */
.file-preview {
    margin-top: 10px;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-preview-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.file-preview-remove {
    color: var(--danger);
    cursor: pointer;
    padding: 5px;
}

/* Модальные окна */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 2000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-size: 22px;
    color: var(--text-primary);
}

.close-modal {
    font-size: 30px;
    color: var(--text-muted);
    cursor: pointer;
}

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

/* Профиль */
.profile-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 30px;
}

.profile-header {
    text-align: center;
    margin-bottom: 30px;
}

.profile-avatar {
    position: relative;
    display: inline-block;
    margin-bottom: 20px;
}

.profile-avatar img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--accent);
}

.edit-avatar-btn {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.profile-name {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.profile-bio {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 20px;
    padding: 0 20px;
}

.profile-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 30px;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 24px;
    font-weight: 600;
    color: var(--accent);
}

.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Группы */
.group-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.group-avatar-large {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
}

.group-details h2 {
    font-size: 24px;
    margin-bottom: 5px;
}

.group-meta {
    color: var(--text-secondary);
    font-size: 14px;
    display: flex;
    gap: 15px;
}

.members-list {
    padding: 15px;
}

.member-item {
    display: flex;
    align-items: center;
    padding: 12px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    margin-bottom: 8px;
}

.member-avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 12px;
}

.member-info {
    flex: 1;
}

.member-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.member-role {
    font-size: 12px;
    color: var(--accent);
    background: rgba(0, 168, 132, 0.1);
    padding: 2px 8px;
    border-radius: 12px;
    display: inline-block;
}

.member-role.owner {
    background: rgba(255, 193, 7, 0.1);
    color: #ffc107;
}

.member-role.admin {
    background: rgba(0, 168, 132, 0.1);
    color: var(--accent);
}

.member-actions {
    display: flex;
    gap: 8px;
}

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

    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
    }

    .main-content {
        height: 60vh;
    }

    .message {
        max-width: 85%;
    }

    .auth-container {
        margin: 20px;
        padding: 30px 20px;
    }

    .profile-container {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .message {
        max-width: 95%;
    }

    .chat-header {
        padding: 10px;
    }

    .message-input {
        padding: 10px;
    }

    .input-group {
        padding: 5px 10px;
    }

    .modal-content {
        padding: 20px;
    }
}

/* Скроллбар */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}

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

/* Анимации */
@keyframes slideIn {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes slideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100%);
        opacity: 0;
    }
}

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

/* Утилиты */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.mt-1 { margin-top: 5px; }
.mt-2 { margin-top: 10px; }
.mt-3 { margin-top: 15px; }
.mt-4 { margin-top: 20px; }
.mt-5 { margin-top: 25px; }

.mb-1 { margin-bottom: 5px; }
.mb-2 { margin-bottom: 10px; }
.mb-3 { margin-bottom: 15px; }
.mb-4 { margin-bottom: 20px; }
.mb-5 { margin-bottom: 25px; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 5px; }
.gap-2 { gap: 10px; }
.gap-3 { gap: 15px; }