/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f8f9fa;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.header {
    background: white;
    border-bottom: 1px solid #e9ecef;
    height: 70px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 1.5rem;
    max-width: 1400px;
    margin: 0 auto;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.menu-btn:hover {
    background: #f8f9fa;
    color: #333;
}

.app-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
}

.app-brand i {
    font-size: 1.8rem;
}

.header-center {
    flex: 1;
    max-width: 500px;
    margin: 0 2rem;
}

.search-container {
    position: relative;
    width: 100%;
}

.search-container i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
}

.search-container input {
    width: 100%;
    padding: 0.8rem 1rem 0.8rem 2.5rem;
    border: 1px solid #e9ecef;
    border-radius: 25px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.search-container input:focus {
    border-color: #667eea;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.notification-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
}

.notification-btn:hover {
    background: #f8f9fa;
    color: #333;
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: #ff4757;
    color: white;
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 50%;
    min-width: 20px;
    text-align: center;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 10px;
    transition: background 0.3s ease;
}

.user-profile:hover {
    background: #f8f9fa;
}

.profile-img {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-info {
    display: flex;
    flex-direction: column;
}

.user-name {
    font-weight: 600;
    color: #333;
    font-size: 0.9rem;
}

.user-status {
    font-size: 0.8rem;
    color: #666;
}

.user-status.online {
    color: #10b981;
}

/* Main Container */
.main-container {
    display: flex;
    height: calc(100vh - 70px);
    margin-top: 70px;
}

/* Sidebar */
.sidebar {
    width: 350px;
    background: white;
    border-right: 1px solid #e9ecef;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
}

.new-chat-btn {
    background: #667eea;
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.new-chat-btn:hover {
    background: #5a6fd8;
    transform: scale(1.1);
}

.conversations-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 0;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    cursor: pointer;
    transition: background 0.3s ease;
    border-bottom: 1px solid #f8f9fa;
}

.conversation-item:hover {
    background: #f8f9fa;
}

.conversation-item.active {
    background: #e3f2fd;
    border-left: 3px solid #667eea;
}

.conversation-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    position: relative;
}

.conversation-avatar.online::after {
    content: '';
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    background: #10b981;
    border: 2px solid white;
    border-radius: 50%;
}

.conversation-content {
    flex: 1;
    min-width: 0;
}

.conversation-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.3rem;
}

.conversation-name {
    font-weight: 600;
    color: #333;
    font-size: 0.95rem;
}

.conversation-time {
    font-size: 0.8rem;
    color: #999;
}

.conversation-message {
    color: #666;
    font-size: 0.9rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-badge {
    background: #667eea;
    color: white;
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid #e9ecef;
}

.user-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem;
    border-radius: 10px;
    transition: background 0.3s ease;
}

.user-card:hover {
    background: #f8f9fa;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.user-details {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.user-email {
    font-size: 0.8rem;
    color: #666;
}

.settings-btn {
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.settings-btn:hover {
    background: #e9ecef;
    color: #333;
}

/* Chat Area */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: #f8f9fa;
}

.welcome-screen {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.welcome-content {
    max-width: 400px;
}

.welcome-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    font-size: 3rem;
    color: white;
}

.welcome-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #333;
}

.welcome-content p {
    color: #666;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: #667eea;
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 25px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
}

/* Active Chat */
.active-chat {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
}

.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: white;
}

.chat-user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.chat-user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.chat-user-details h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #333;
    margin-bottom: 0.2rem;
}

.chat-user-status {
    font-size: 0.9rem;
    color: #10b981;
}

.chat-actions {
    display: flex;
    gap: 0.5rem;
}

.chat-action-btn {
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.chat-action-btn:hover {
    background: #f8f9fa;
    color: #333;
}

/* Messages Container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: #f8f9fa;
}

.messages-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    display: flex;
    gap: 0.5rem;
    max-width: 70%;
}

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

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

.message-avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    object-fit: cover;
    flex-shrink: 0;
}

.message-content {
    background: white;
    padding: 0.8rem 1rem;
    border-radius: 18px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: relative;
}

.message.sent .message-content {
    background: #667eea;
    color: white;
}

.message-text {
    font-size: 0.95rem;
    line-height: 1.4;
}

.message-time {
    font-size: 0.75rem;
    color: #999;
    margin-top: 0.3rem;
    text-align: right;
}

.message.sent .message-time {
    color: rgba(255, 255, 255, 0.8);
}

.message-status {
    font-size: 0.7rem;
    margin-left: 0.5rem;
}

/* Message Input */
.message-input-container {
    padding: 1rem 1.5rem;
    background: white;
    border-top: 1px solid #e9ecef;
}

.message-input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
    background: #f8f9fa;
    border-radius: 25px;
    padding: 0.5rem;
}

.attachment-btn,
.emoji-btn {
    background: none;
    border: none;
    color: #666;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
    flex-shrink: 0;
}

.attachment-btn:hover,
.emoji-btn:hover {
    background: #e9ecef;
    color: #333;
}

.message-input {
    flex: 1;
    display: flex;
    align-items: flex-end;
}

.message-input textarea {
    width: 100%;
    border: none;
    background: none;
    resize: none;
    padding: 0.5rem;
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    max-height: 120px;
    min-height: 20px;
}

.send-btn {
    background: #667eea;
    color: white;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.send-btn:hover {
    background: #5a6fd8;
    transform: scale(1.1);
}

.send-btn:disabled {
    background: #ccc;
    cursor: not-allowed;
    transform: none;
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 2000;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: white;
    border-radius: 15px;
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
}

.modal-close {
    background: none;
    border: none;
    color: #666;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: #f8f9fa;
    color: #333;
}

.modal-body {
    padding: 1.5rem;
}

/* New Chat Modal */
.search-users {
    margin-bottom: 1.5rem;
}

.search-users input {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.search-users input:focus {
    border-color: #667eea;
}

.users-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.user-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.user-item:hover {
    background: #f8f9fa;
}

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

.user-item-info {
    flex: 1;
}

.user-item-name {
    font-weight: 600;
    color: #333;
    margin-bottom: 0.2rem;
}

.user-item-status {
    font-size: 0.9rem;
    color: #666;
}

/* Settings Modal */
.settings-section {
    margin-bottom: 2rem;
}

.settings-section h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #333;
}

.profile-settings {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.profile-avatar {
    position: relative;
}

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

.change-avatar-btn {
    position: absolute;
    bottom: 0;
    right: 0;
    background: #667eea;
    color: white;
    border: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
}

.profile-form {
    flex: 1;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: #333;
}

.form-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    border-color: #667eea;
}

.notification-settings,
.appearance-settings {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 10px;
}

.setting-item span {
    font-weight: 500;
    color: #333;
}

/* Switch Toggle */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #667eea;
}

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

.settings-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.btn-secondary {
    background: #f8f9fa;
    color: #333;
    border: 1px solid #e9ecef;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-secondary:hover {
    background: #e9ecef;
}

.btn-danger {
    background: #ff4757;
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-danger:hover {
    background: #e63946;
}

/* Notifications Panel */
.notifications-panel {
    position: fixed;
    top: 0;
    right: -350px;
    width: 350px;
    height: 100vh;
    background: white;
    box-shadow: -5px 0 20px rgba(0, 0, 0, 0.1);
    transition: right 0.3s ease;
    z-index: 1500;
    display: flex;
    flex-direction: column;
}

.notifications-panel.active {
    right: 0;
}

.notifications-header {
    padding: 1.5rem;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notifications-close {
    background: none;
    border: none;
    color: #666;
    font-size: 1.2rem;
    cursor: pointer;
}

.notifications-list {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.notification-item {
    padding: 1rem;
    border-bottom: 1px solid #f8f9fa;
    cursor: pointer;
    transition: background 0.3s ease;
}

.notification-item:hover {
    background: #f8f9fa;
}

.notification-title {
    font-weight: 600;
    color: #333;
    margin-bottom: 0.3rem;
}

.notification-message {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.notification-time {
    font-size: 0.8rem;
    color: #999;
}

/* Emoji Picker */
.emoji-picker {
    position: absolute;
    bottom: 100%;
    left: 0;
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    width: 300px;
    max-height: 300px;
    display: none;
    z-index: 1000;
}

.emoji-picker.active {
    display: block;
}

.emoji-categories {
    display: flex;
    border-bottom: 1px solid #e9ecef;
}

.emoji-category {
    flex: 1;
    background: none;
    border: none;
    padding: 0.8rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.emoji-category.active {
    background: #f8f9fa;
    color: #667eea;
}

.emoji-list {
    padding: 1rem;
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0.5rem;
    max-height: 250px;
    overflow-y: auto;
}

.emoji-item {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 5px;
    transition: background 0.3s ease;
}

.emoji-item:hover {
    background: #f8f9fa;
}

/* Attachment Menu */
.attachment-menu {
    position: absolute;
    bottom: 100%;
    left: 0;
    background: white;
    border: 1px solid #e9ecef;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    width: 200px;
    display: none;
    z-index: 1000;
}

.attachment-menu.active {
    display: block;
}

.attachment-option {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.attachment-option:hover {
    background: #f8f9fa;
}

.attachment-option i {
    color: #667eea;
    font-size: 1.2rem;
}

/* Call Interface */
.call-interface {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    z-index: 3000;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.call-header {
    position: absolute;
    top: 2rem;
    left: 2rem;
    right: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.call-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.call-duration {
    font-size: 1.1rem;
    opacity: 0.8;
}

.call-actions {
    display: flex;
    gap: 1rem;
}

.call-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.call-btn.mute {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.call-btn.video {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.call-btn.speaker {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.call-btn.end {
    background: #ff4757;
    color: white;
}

.call-btn:hover {
    transform: scale(1.1);
}

/* Back to Portfolio Button */
.back-to-portfolio {
    position: fixed;
    bottom: 2rem;
    left: 2rem;
    z-index: 1000;
}

.back-btn {
    background: #667eea;
    color: white;
    text-decoration: none;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

.back-btn:hover {
    background: #5a6fd8;
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header-center {
        display: none;
    }
    
    .sidebar {
        position: fixed;
        top: 70px;
        left: -350px;
        height: calc(100vh - 70px);
        z-index: 1000;
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .chat-area {
        width: 100%;
    }
    
    .message {
        max-width: 85%;
    }
    
    .modal {
        width: 95%;
        margin: 1rem;
    }
    
    .back-to-portfolio {
        bottom: 1rem;
        left: 1rem;
    }
    
    .back-btn {
        padding: 0.8rem 1.2rem;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 1rem;
    }
    
    .app-brand span {
        display: none;
    }
    
    .user-profile .user-info {
        display: none;
    }
    
    .message {
        max-width: 90%;
    }
    
    .chat-actions {
        gap: 0.3rem;
    }
    
    .chat-action-btn {
        padding: 0.3rem;
    }
    
    .call-actions {
        gap: 0.5rem;
    }
    
    .call-btn {
        width: 50px;
        height: 50px;
        font-size: 1rem;
    }
}