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

:root {
    --primary-color: #4361ee;
    --primary-dark: #3a56d4;
    --secondary-color: #7209b7;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --info-color: #3498db;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --gray-color: #6c757d;
    --light-gray: #e9ecef;
    --border-radius: 8px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    direction: rtl;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.main-header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.main-header h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.tagline {
    color: var(--gray-color);
    font-size: 1.1rem;
}

.welcome-section {
    margin-bottom: 40px;
}

.welcome-box {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    text-align: center;
}

.welcome-description {
    color: var(--gray-color);
    margin-bottom: 30px;
    font-size: 1.1rem;
}

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
}

.feature {
    background: var(--light-color);
    padding: 25px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.feature i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}

.action-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 30px;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

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

.btn-secondary {
    background: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--light-color);
}

.btn-block {
    display: block;
    width: 100%;
    justify-content: center;
}

.main-footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px;
    color: var(--gray-color);
}

.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.auth-container {
    width: 100%;
    max-width: 450px;
    padding: 20px;
}

.auth-box {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 15px 35px rgba(50, 50, 93, 0.1), 0 5px 15px rgba(0, 0, 0, 0.07);
    padding: 40px;
}

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

.auth-header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.auth-form .form-group {
    margin-bottom: 20px;
}

.auth-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--dark-color);
}

.auth-form input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.auth-form input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.1);
}

.alert {
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-error {
    background: #fee;
    color: var(--danger-color);
    border: 1px solid #fcc;
}

.alert-success {
    background: #effff0;
    color: var(--success-color);
    border: 1px solid #cfc;
}

.auth-footer {
    text-align: center;
    margin-top: 25px;
    color: var(--gray-color);
}

.auth-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

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

.chat-page {
    background: #f0f2f5;
    min-height: 100vh;
}

.chat-container {
    display: flex;
    height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
}

.sidebar {
    width: 280px;
    background: white;
    border-left: 1px solid var(--light-gray);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--light-gray);
    background: var(--primary-color);
    color: white;
}

.sidebar-header h3 {
    margin-bottom: 20px;
}

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

.user-avatar {
    font-size: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

.user-details {
    flex: 1;
}

.user-details small {
    opacity: 0.8;
}

.sidebar-section {
    padding: 20px;
    border-bottom: 1px solid var(--light-gray);
    flex: 1;
    overflow-y: auto;
}

.sidebar-section h4 {
    margin-bottom: 15px;
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 8px;
}

.online-users-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.online-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.online-user:hover {
    background: var(--light-gray);
}

.online-user.active-chat {
    background: #e3f2fd;
}

.online-status {
    width: 10px;
    height: 10px;
    background: var(--success-color);
    border-radius: 50%;
    display: inline-block;
}

.user-name {
    flex: 1;
}

.private-chat-btn {
    color: var(--primary-color);
    text-decoration: none;
    padding: 5px;
    border-radius: 4px;
    transition: var(--transition);
}

.private-chat-btn:hover {
    background: rgba(67, 97, 238, 0.1);
}

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

.private-chat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    text-decoration: none;
    color: var(--dark-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.private-chat-item:hover {
    background: var(--light-gray);
}

.private-chat-item.active {
    background: #e3f2fd;
    border-left: 3px solid var(--primary-color);
}

.private-chat-item.has-unread {
    font-weight: 600;
}

.chat-info {
    flex: 1;
}

.chat-info small {
    display: block;
    color: var(--gray-color);
    font-size: 0.85rem;
    margin-top: 3px;
}

.unread-count {
    background: var(--primary-color);
    color: white;
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
}

.no-chats {
    text-align: center;
    color: var(--gray-color);
    font-style: italic;
    padding: 20px 0;
}

.sidebar-footer {
    padding: 15px;
    border-top: 1px solid var(--light-gray);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sidebar-btn {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 15px;
    background: var(--light-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--dark-color);
    transition: var(--transition);
}

.sidebar-btn:hover {
    background: var(--light-gray);
}

.sidebar-btn.logout-btn {
    color: var(--danger-color);
    background: #fee;
}

.sidebar-btn.logout-btn:hover {
    background: #fdd;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: white;
}

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

.chat-header h2 {
    color: var(--dark-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.chat-info {
    color: var(--gray-color);
}

.private-header {
    background: #f8f9fa;
}

.private-chat-info {
    flex: 1;
}

.chat-status {
    margin-top: 5px;
}

.status-indicator {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
    padding: 3px 10px;
    border-radius: 12px;
}

.status-indicator.online {
    background: #e8f6ef;
    color: var(--success-color);
}

.status-indicator.online::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--success-color);
    border-radius: 50%;
    display: inline-block;
}

.status-indicator.offline {
    background: #f5f5f5;
    color: var(--gray-color);
}

.chat-actions {
    margin-right: auto;
    margin-left: 20px;
}

.back-to-public {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    background: var(--light-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--dark-color);
    transition: var(--transition);
}

.back-to-public:hover {
    background: var(--light-gray);
}

.chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f0f2f5;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 70%;
    padding: 15px;
    border-radius: var(--border-radius);
    background: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.my-message {
    align-self: flex-end;
    background: #e3f2fd;
    border-bottom-right-radius: 4px;
}

.other-message {
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.message-avatar {
    font-size: 1.5rem;
    color: var(--gray-color);
}

.message-info {
    flex: 1;
}

.message-info strong {
    color: var(--dark-color);
}

.message-info small {
    color: var(--gray-color);
    font-size: 0.85rem;
    margin-right: 10px;
}

.message-content {
    line-height: 1.5;
    color: #333;
}

.message-attachment {
    margin-top: 10px;
}

.message-attachment img,
.message-attachment video {
    max-width: 100%;
    border-radius: 5px;
}

.file-attachment {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--light-color);
    border-radius: 5px;
    border: 1px solid var(--light-gray);
}

.file-attachment a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.file-attachment a:hover {
    text-decoration: underline;
}

.file-attachment small {
    color: var(--gray-color);
    font-size: 0.9rem;
}

.message-status {
    margin-top: 5px;
    font-size: 0.8rem;
    color: var(--gray-color);
    display: flex;
    align-items: center;
    gap: 5px;
}

.message-status.unread {
    color: var(--warning-color);
}

.no-messages {
    text-align: center;
    color: var(--gray-color);
    padding: 50px 20px;
}

.no-messages i {
    font-size: 3rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.chat-input-container {
    padding: 20px;
    border-top: 1px solid var(--light-gray);
    background: white;
}

.input-group {
    display: flex;
    gap: 10px;
}

.input-group input {
    flex: 1;
    padding: 15px;
    border: 2px solid var(--light-gray);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.upload-btn {
    padding: 0 20px;
    background: var(--info-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.upload-btn:hover {
    background: #2980b9;
}

.send-btn {
    padding: 0 30px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.image-modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.9);
    justify-content: center;
    align-items: center;
}

.modal-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
}

.modal-content img {
    max-width: 100%;
    max-height: 90vh;
    display: block;
}

.close {
    position: absolute;
    top: -40px;
    right: 0;
    color: white;
    font-size: 35px;
    font-weight: bold;
    cursor: pointer;
}

.close:hover {
    color: #bbb;
}

.upload-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.upload-container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

.upload-header {
    background: linear-gradient(135deg, #4361ee 0%, #3a0ca3 100%);
    color: white;
    padding: 30px;
    text-align: center;
}

.upload-header h1 {
    margin-bottom: 10px;
    font-size: 2.2rem;
}

.upload-nav {
    background: #f8f9fa;
    padding: 15px 30px;
    display: flex;
    gap: 15px;
    border-bottom: 1px solid #e9ecef;
}

.upload-nav a {
    color: #4361ee;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 5px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.upload-nav a:hover {
    background: #e3f2fd;
}

.upload-main {
    padding: 30px;
}

.upload-box {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 30px;
    margin-bottom: 30px;
}

.upload-info {
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    border-right: 4px solid #4361ee;
}

.upload-info h3 {
    color: #4361ee;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-info ul {
    list-style: none;
    padding: 0;
}

.upload-info li {
    padding: 8px 0;
    border-bottom: 1px solid #eee;
    display: flex;
    align-items: center;
    gap: 10px;
}

.upload-info li:last-child {
    border-bottom: none;
}

.upload-form {
    margin: 30px 0;
}

.file-input-container {
    margin-bottom: 20px;
}

.file-input {
    display: none;
}

.file-input-label {
    display: block;
    padding: 50px 20px;
    background: white;
    border: 3px dashed #4361ee;
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.file-input-label:hover {
    background: #f0f7ff;
    border-color: #3a56d4;
}

.file-input-label i {
    font-size: 3rem;
    color: #4361ee;
    margin-bottom: 15px;
    display: block;
}

.file-input-label span {
    color: #666;
    font-size: 1.1rem;
}

.upload-btn {
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
}

.upload-result {
    background: white;
    border-radius: 10px;
    padding: 25px;
    margin-top: 30px;
    border: 2px solid #4CAF50;
}

.upload-result h3 {
    color: #4CAF50;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.result-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px solid #eee;
}

.result-info {
    flex: 1;
}

.result-actions {
    display: flex;
    gap: 10px;
}

@media (max-width: 768px) {
    .chat-container {
        flex-direction: column;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        max-height: 40vh;
        border-left: none;
        border-bottom: 1px solid var(--light-gray);
    }
    
    .features {
        grid-template-columns: 1fr;
    }
    
    .message {
        max-width: 85%;
    }
    
    .auth-box {
        padding: 30px 20px;
    }
    
    .upload-nav {
        flex-wrap: wrap;
    }
    
    .result-details {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }
}