:root {
    --primary-color: #0084ff;
    --primary-dark: #0073e6;
    --secondary-color: #2c3e50;
    --background-dark: #0d1117;
    --background-light: #161b22;
    --surface-color: #21262d;
    --border-color: #30363d;
    --text-primary: #ffffff;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --success-color: #2ea043;
    --danger-color: #f85149;
    --warning-color: #f0883e;
    --online-color: #3fb950;
    --offline-color: #8b949e;
    --message-in: #21262d;
    --message-out: #0084ff;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--background-dark);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* Основной контейнер */
.app-container {
    display: flex;
    height: 100vh;
    background: var(--background-dark);
}

/* Левая панель */
.sidebar {
    width: 320px;
    background: var(--background-light);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.app-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.logo-icon {
    font-size: 24px;
}

.app-logo h2 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.user-info {
    background: var(--surface-color);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.user-info small {
    display: block;
    color: var(--text-secondary);
    font-size: 12px;
    margin-bottom: 4px;
}

.uuid-display {
    font-family: 'Courier New', monospace;
    font-size: 11px;
    color: var(--text-primary);
    word-break: break-all;
}

/* Добавление друга */
.add-friend-section {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.add-friend {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.friend-input {
    flex: 1;
    padding: 10px 12px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.friend-input:focus {
    border-color: var(--primary-color);
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--primary-color);
    border: none;
    color: white;
    font-size: 18px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-icon:hover {
    background: var(--primary-dark);
}

.friend-count {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Список друзей */
.friends-section {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.friends-section h3 {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.friends-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.friend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}

.friend-item:hover {
    background: var(--background-light);
    border-color: var(--primary-color);
}

.friend-item.selected {
    background: rgba(0, 132, 255, 0.1);
    border-color: var(--primary-color);
}

.friend-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 600;
    color: white;
}

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

.friend-name {
    font-weight: 500;
    margin-bottom: 2px;
    color: var(--text-primary);
}

.friend-id {
    font-size: 11px;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
    margin-bottom: 4px;
}

.friend-status {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 11px;
}

.status-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
}

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

.status-dot.offline {
    background: var(--offline-color);
}

.status-text {
    color: var(--text-secondary);
}

.no-friends {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
    font-style: italic;
}

/* Основная область */
.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Шапка чата */
.chat-header {
    padding: 16px 24px;
    background: var(--background-light);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.partner-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--surface-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.partner-details {
    flex: 1;
}

.partner-name {
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 4px;
}

.partner-status {
    display: flex;
    align-items: center;
    gap: 6px;
}

.call-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn-call {
    padding: 10px 20px;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.btn-call:hover:not(:disabled) {
    background: #2c974b;
}

.btn-call:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-end-call {
    width: 44px;
    height: 44px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
    transition: background-color 0.2s;
}

.btn-end-call:hover:not(:disabled) {
    background: #d73a49;
}

.btn-end-call:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Контентная область */
.content-area {
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* Видеозвонок */
.video-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    padding: 20px;
    height: 100%;
    background: #000;
}

.video-wrapper {
    position: relative;
    background: var(--surface-color);
    border-radius: 12px;
    overflow: hidden;
}

video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: #000;
}

.video-label {
    position: absolute;
    top: 12px;
    left: 12px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 2;
}

.video-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--surface-color);
    color: var(--text-secondary);
}

/* Чат */
.chat-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-content {
    text-align: center;
    max-width: 400px;
}

.placeholder-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.placeholder-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.placeholder-text {
    color: var(--text-secondary);
    line-height: 1.5;
}

.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--background-dark);
}

.chat-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    max-width: 70%;
    padding: 12px 16px;
    border-radius: 18px;
    font-size: 14px;
    line-height: 1.4;
    word-wrap: break-word;
    animation: messageAppear 0.3s ease-out;
}

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

.message.incoming {
    align-self: flex-start;
    background: var(--message-in);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.message.outgoing {
    align-self: flex-end;
    background: var(--message-out);
    color: white;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 4px;
}

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

.message-time {
    font-size: 11px;
    opacity: 0.7;
}

.message-text {
    margin-bottom: 4px;
}

.message-input-container {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--background-light);
    display: flex;
    gap: 12px;
}

.message-input-container input {
    flex: 1;
    padding: 12px 16px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.message-input-container input:focus {
    border-color: var(--primary-color);
}

.message-input-container input:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-send {
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-send:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Модальное окно */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: var(--background-light);
    border-radius: 16px;
    padding: 32px;
    max-width: 400px;
    width: 100%;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.modal-body {
    text-align: center;
}

.caller-avatar {
    font-size: 64px;
    margin-bottom: 24px;
}

.caller-info {
    margin-bottom: 32px;
}

.caller-name {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.caller-id {
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
    font-size: 14px;
}

.call-actions {
    display: flex;
    gap: 16px;
}

.btn {
    flex: 1;
    padding: 16px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: transform 0.2s, background-color 0.2s;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

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

.btn-icon {
    font-size: 18px;
}

/* Утилиты */
.hidden {
    display: none !important;
}

/* Скроллбар */
::-webkit-scrollbar {
    width: 8px;
}

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

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

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

/* Адаптивность */
@media (max-width: 1024px) {
    .sidebar {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: 40vh;
    }
    
    .video-container {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }
}
/* Медиа-кнопки в шапке */
.media-controls {
    display: flex;
    gap: 8px;
    align-items: center;
}

.btn-media {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 18px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.btn-media:hover {
    background: var(--background-light);
    transform: translateY(-1px);
}

.btn-media.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Статус "connecting" */
.status-dot.connecting {
    background: var(--warning-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Кнопки звонка в шапке */
.btn-call {
    padding: 10px 20px;
    background: var(--success-color);
    color: white;
    border: none;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.btn-call:hover:not(:disabled) {
    background: #2c974b;
}

.btn-call:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-end-call {
    width: 44px;
    height: 44px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 20px;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-end-call:hover:not(:disabled) {
    background: #d73a49;
}

.btn-end-call:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Утилита для скрытия элементов */
.hidden {
    display: none !important;
}

/* Кнопка отправки сообщения */
.btn-send {
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-send:hover:not(:disabled) {
    background: var(--primary-dark);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}