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

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --bg-dark: #1e293b;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

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

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.login-box h1 {
    text-align: center;
    margin-bottom: 10px;
    color: var(--primary-color);
    font-size: 2rem;
}

.subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.login-info {
    margin-top: 20px;
    text-align: center;
    color: var(--text-secondary);
}

/* Chat Container */
.chat-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.chat-sidebar {
    width: 300px;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.sidebar-header h2 {
    margin-bottom: 10px;
}

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

.username {
    font-weight: 600;
}

.badge {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-admin {
    background: rgba(255, 255, 255, 0.3);
    color: white;
}

.badge-user {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.badge-supervisor {
    background: rgba(245, 158, 11, 0.3);
    color: white;
}

.badge-admin-small {
    background: var(--primary-color);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
}

.sidebar-content {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
}

.search-section {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-search-input {
    width: 100%;
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
    background: var(--bg-color);
}

.sidebar-search-input:focus {
    border-color: var(--primary-color);
    background: var(--bg-card);
}

.channels-section,
.users-section {
    margin-bottom: 15px;
}

.channels-section h3,
.users-section h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-secondary);
    margin-bottom: 5px;
    font-weight: 600;
}

.channels-list,
.users-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.channel-item,
.user-item {
    padding: 6px 10px;
    border-radius: 6px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    font-size: 0.9rem;
    min-height: 32px;
}

.channel-item:hover,
.user-item:hover {
    background: var(--bg-color);
}

.channel-item.active,
.user-item.active {
    background: var(--primary-color);
    color: white;
}

.channel-item.has-new-message,
.user-item.has-new-message {
    background: rgba(99, 102, 241, 0.2);
    border: 2px solid var(--primary-color);
    animation: pulse 2s infinite;
    position: relative;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(99, 102, 241, 0.7);
    }
    50% {
        box-shadow: 0 0 0 8px rgba(99, 102, 241, 0);
    }
}

.unread-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--danger-color);
    color: white;
    border-radius: 10px;
    min-width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0 6px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.channel-icon,
.user-icon {
    font-size: 1.2rem;
}

.no-channels {
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: 10px;
    text-align: center;
}

.no-search-results {
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: 20px;
    text-align: center;
    font-style: italic;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Chat Main */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-color);
}

.chat-header {
    padding: 20px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    position: relative;
}

.chat-header h3 {
    color: var(--text-primary);
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-header h3::after {
    content: '🔍';
    font-size: 1.2rem;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s;
    margin-left: 10px;
}

.chat-header h3:hover::after {
    opacity: 1;
}

.chat-search-container {
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
}

.chat-search-input {
    flex: 1;
    padding: 10px 40px 10px 16px;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s;
}

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

.chat-search-close {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    padding: 4px 8px;
    border-radius: 50%;
    transition: background 0.2s;
    line-height: 1;
}

.chat-search-close:hover {
    background: var(--bg-color);
    color: var(--text-primary);
}

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

.welcome-message {
    text-align: center;
    color: var(--text-secondary);
    padding: 40px;
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 70%;
    animation: slideIn 0.3s ease-out;
}

.message.search-highlight {
    background: rgba(99, 102, 241, 0.1);
    border-left: 3px solid var(--primary-color);
    padding-left: 10px;
}

.message.search-highlight mark {
    background: yellow;
    padding: 2px 4px;
    border-radius: 3px;
}

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

.new-reaction-alert {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--bg-card);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    z-index: 10000;
    min-width: 300px;
    max-width: 400px;
    animation: slideInRight 0.3s ease-out;
}

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

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

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

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

.message-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 5px;
    font-size: 0.875rem;
    position: relative;
}

.message-header .sender {
    font-weight: 600;
    color: var(--primary-color);
}

.message.own .message-header .sender {
    color: var(--secondary-color);
}

.message-header .time {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.btn-delete-message {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.75rem;
    padding: 2px 6px;
    margin-left: auto;
    opacity: 0;
    transition: all 0.2s;
    border-radius: 4px;
    line-height: 1;
}

.message:hover .btn-delete-message {
    opacity: 1;
}

.btn-delete-message:hover {
    color: var(--danger-color);
    background: rgba(239, 68, 68, 0.1);
    transform: scale(1.1);
}

.message {
    transition: opacity 0.3s, transform 0.3s;
}

/* New Message Alert */
.new-message-alert {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    background: var(--bg-card);
    border: 2px solid var(--primary-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    min-width: 300px;
    max-width: 400px;
    animation: slideInRight 0.3s ease-out;
    transition: all 0.3s;
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.alert-content {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 15px;
}

.alert-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.alert-text {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.alert-text strong {
    color: var(--text-primary);
    font-size: 0.9rem;
}

.alert-text span {
    color: var(--text-secondary);
    font-size: 0.8rem;
}

.alert-close {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.5rem;
    line-height: 1;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
    flex-shrink: 0;
}

.alert-close:hover {
    background: var(--bg-color);
    color: var(--text-primary);
}

.message-content {
    padding: 12px 16px;
    border-radius: 12px;
    background: var(--bg-card);
    box-shadow: var(--shadow);
    word-wrap: break-word;
}

.message.own .message-content {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.message.other .message-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

/* Reply Preview */
.reply-preview {
    padding: 10px 15px;
    background: var(--bg-color);
    border-left: 3px solid var(--primary-color);
    border-radius: 6px;
    margin-bottom: 10px;
}

.reply-preview-content {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.reply-preview-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
}

.reply-preview-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.reply-preview-sender {
    color: var(--primary-color);
    font-weight: 600;
}

.btn-cancel-reply {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    margin-left: auto;
    padding: 0;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

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

.reply-preview-text {
    color: var(--text-primary);
    font-size: 0.875rem;
    font-style: italic;
    padding-left: 10px;
    border-left: 2px solid var(--border-color);
}

/* Message Reply Quote */
.message-reply {
    margin-bottom: 8px;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.05);
    border-left: 3px solid var(--primary-color);
    border-radius: 4px;
}

.message.own .message-reply {
    background: rgba(255, 255, 255, 0.15);
    border-left-color: white;
}

.reply-indicator {
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 4px;
}

.message.own .reply-indicator {
    color: rgba(255, 255, 255, 0.9);
}

.reply-quote {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-style: italic;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message.own .reply-quote {
    color: rgba(255, 255, 255, 0.8);
}

/* Context Menu */
.context-menu {
    position: fixed;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    min-width: 150px;
    padding: 4px;
}

.context-menu-item {
    width: 100%;
    padding: 10px 15px;
    border: none;
    background: transparent;
    text-align: left;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.875rem;
    color: var(--text-primary);
    transition: background 0.2s;
}

.context-menu-item:hover {
    background: var(--bg-color);
}

.context-menu-reactions {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px;
    border-bottom: 1px solid var(--border-color);
}

.context-menu-reaction {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    padding: 0;
}

.context-menu-reaction:hover {
    background: var(--primary-color);
    transform: scale(1.1);
}

.context-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

.message-reactions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border-color);
}

.reaction-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    background: var(--bg-color);
    border-radius: 12px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: background 0.2s;
}

.reaction-item:hover {
    background: var(--primary-color);
    color: white;
}

.message-file {
    margin-top: 8px;
    padding: 8px 12px;
    background: rgba(0, 0, 0, 0.05);
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.message.own .message-file {
    background: rgba(255, 255, 255, 0.2);
}

.file-icon {
    font-size: 1.2rem;
}

.file-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message.own .file-link {
    color: white;
}

.file-link:hover {
    text-decoration: underline;
}

.file-size {
    font-size: 0.75rem;
    color: var(--text-secondary);
    white-space: nowrap;
}

.message.own .file-size {
    color: rgba(255, 255, 255, 0.8);
}

/* File Input */
.input-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    position: relative;
    z-index: 10;
}

.emoji-toggle {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
    flex-shrink: 0;
    position: relative;
    z-index: 101;
    pointer-events: auto;
}

.emoji-toggle:hover {
    background: var(--bg-color);
}

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

.emoji-picker {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 12px;
    width: 300px;
    max-height: 300px;
    overflow-y: auto;
    z-index: 10001;
    pointer-events: auto;
}

.emoji-grid {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 4px;
}

.emoji-item {
    font-size: 1.5rem;
    padding: 6px;
    cursor: pointer;
    text-align: center;
    border-radius: 6px;
    transition: background 0.2s;
    user-select: none;
}

.emoji-item:hover {
    background: var(--bg-color);
    transform: scale(1.2);
}

.file-input-label {
    cursor: pointer;
    font-size: 1.5rem;
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    transition: background 0.2s;
    flex-shrink: 0;
}

.file-input-label:hover {
    background: var(--bg-color);
}

.file-preview {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background: var(--bg-color);
    border-radius: 8px;
    margin-bottom: 10px;
    font-size: 0.875rem;
}

#file-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-primary);
}

.btn-remove-file {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    flex-shrink: 0;
}

.btn-remove-file:hover {
    background: #dc2626;
}

.chat-input-container {
    padding: 20px;
    background: var(--bg-card);
    border-top: 1px solid var(--border-color);
    position: relative;
    z-index: 100;
}

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

#message-input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 24px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
    position: relative;
    z-index: 100;
    pointer-events: auto;
}

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

#message-input:disabled {
    background: var(--bg-color);
    cursor: not-allowed;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

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

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

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-block {
    width: 100%;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.75rem;
}

/* Admin Page */
.admin-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

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

.admin-header h1 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

/* Tabs */
.tabs-container {
    background: var(--bg-card);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.tabs-header {
    display: flex;
    border-bottom: 2px solid var(--border-color);
    background: var(--bg-color);
}

.tab-button {
    flex: 1;
    padding: 15px 20px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    transition: all 0.2s;
    border-bottom: 3px solid transparent;
}

.tab-button:hover {
    background: rgba(99, 102, 241, 0.05);
    color: var(--text-primary);
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--bg-card);
}

.tab-content {
    display: none;
    padding: 20px;
}

.tab-content.active {
    display: block;
}

.admin-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.admin-content-compact {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 20px;
}

.admin-section {
    background: var(--bg-card);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.admin-section-compact {
    background: transparent;
    padding: 0;
}

.admin-section-compact h3 {
    margin-bottom: 15px;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

.admin-section h2 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.user-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.user-form-compact {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 10px;
}

.form-group-compact {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group-compact label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.8rem;
}

.form-group-compact input,
.form-group-compact select {
    padding: 8px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group-compact input:focus,
.form-group-compact select:focus {
    border-color: var(--primary-color);
}

.form-group-compact select[multiple] {
    min-height: 80px;
    padding: 6px;
    font-size: 0.875rem;
}

.form-group-compact small {
    color: var(--text-secondary);
    font-size: 0.7rem;
    margin-top: 2px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.form-group input,
.form-group select {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary-color);
}

.form-group select[multiple] {
    min-height: 100px;
    padding: 8px;
}

.form-group select[multiple] option {
    padding: 5px;
    margin: 2px 0;
}

.users-table {
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: 500px;
    overflow-y: auto;
}

.users-table-compact {
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 600px;
    overflow-y: auto;
}

.user-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background: var(--bg-color);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.user-row-compact {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    background: var(--bg-color);
    border-radius: 6px;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
    line-height: 1.4;
}

.user-row-compact:hover {
    background: #f1f5f9;
    border-color: var(--primary-color);
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

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

.user-main-info {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 3px;
}

.user-main-info strong {
    font-size: 0.85rem;
}

.user-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.channels-badge {
    font-size: 0.7rem;
    color: var(--text-secondary);
    background: rgba(99, 102, 241, 0.1);
    padding: 2px 5px;
    border-radius: 3px;
    line-height: 1.3;
}

.user-info small {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

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

.user-actions-compact {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.search-box {
    margin-bottom: 15px;
}

.search-input {
    width: 100%;
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.875rem;
    outline: none;
    transition: border-color 0.2s;
}

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

/* Alerts */
.alert {
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.2s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--bg-card);
    margin: 10% auto;
    padding: 30px;
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    box-shadow: var(--shadow-lg);
    position: relative;
    animation: slideDown 0.3s;
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close {
    position: absolute;
    right: 20px;
    top: 20px;
    font-size: 28px;
    font-weight: bold;
    color: var(--text-secondary);
    cursor: pointer;
}

.close:hover {
    color: var(--text-primary);
}

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

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

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

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

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    position: fixed;
    top: 15px;
    left: 15px;
    z-index: 1001;
    background: var(--primary-color);
    border: none;
    border-radius: 8px;
    width: 44px;
    height: 44px;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 3px;
    background: white;
    border-radius: 2px;
    transition: all 0.3s;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* Responsive - Tablet e Mobile */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .chat-container {
        position: relative;
    }
    
    .chat-sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        width: 280px;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease;
        box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
    }
    
    .chat-sidebar.active {
        left: 0;
    }
    
    .chat-main {
        width: 100%;
    }
    
    .sidebar-header {
        padding: 15px;
    }
    
    .sidebar-header h2 {
        font-size: 1.25rem;
    }
    
    .sidebar-content {
        padding: 15px;
    }
    
    .chat-header {
        padding: 15px;
    }
    
    .chat-header h3 {
        font-size: 1rem;
    }
    
    .chat-messages {
        padding: 15px;
    }
    
    .message {
        max-width: 85%;
    }
    
    .chat-input-container {
        padding: 15px;
    }
    
    .chat-input-form {
        gap: 8px;
    }
    
    #message-input {
        font-size: 16px; /* Previene zoom su iOS */
        padding: 12px;
    }
    
    #send-btn {
        padding: 12px 20px;
        font-size: 0.875rem;
        min-width: 70px;
    }
    
    .admin-content {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .admin-section {
        padding: 20px;
    }
    
    .admin-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }
    
    .admin-header h1 {
        font-size: 1.5rem;
    }
    
    .user-row {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
    }
    
    .user-actions {
        width: 100%;
        justify-content: flex-start;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
        padding: 20px;
        max-height: 90vh;
        overflow-y: auto;
    }
    
    .login-box {
        padding: 30px 20px;
    }
    
    .login-box h1 {
        font-size: 1.75rem;
    }
}

/* Responsive - Smartphone piccolo */
@media (max-width: 480px) {
    .mobile-menu-toggle {
        top: 10px;
        left: 10px;
        width: 40px;
        height: 40px;
    }
    
    .chat-sidebar {
        width: 100%;
    }
    
    .sidebar-header {
        padding: 12px;
    }
    
    .sidebar-header h2 {
        font-size: 1.1rem;
    }
    
    .user-info {
        flex-wrap: wrap;
        gap: 5px;
    }
    
    .badge {
        font-size: 0.7rem;
        padding: 3px 6px;
    }
    
    .channels-section h3,
    .users-section h3 {
        font-size: 0.8rem;
    }
    
    .channel-item,
    .user-item {
        padding: 10px;
        font-size: 0.9rem;
    }
    
    .chat-header {
        padding: 12px;
    }
    
    .chat-header h3 {
        font-size: 0.9rem;
    }
    
    .chat-messages {
        padding: 12px;
    }
    
    .message {
        max-width: 90%;
    }
    
    .message-content {
        padding: 10px 14px;
        font-size: 0.9rem;
    }
    
    .message-header {
        font-size: 0.75rem;
    }
    
    .chat-input-container {
        padding: 12px;
    }
    
    #message-input {
        padding: 10px;
        font-size: 16px;
    }
    
    #send-btn {
        padding: 10px 16px;
        font-size: 0.8rem;
        min-width: 60px;
    }
    
    .admin-container {
        padding: 15px;
    }
    
    .admin-header h1 {
        font-size: 1.25rem;
    }
    
    .admin-section {
        padding: 15px;
    }
    
    .admin-section h2 {
        font-size: 1.1rem;
    }
    
    .form-group input,
    .form-group select {
        padding: 10px;
        font-size: 16px; /* Previene zoom su iOS */
    }
    
    .form-group select[multiple] {
        min-height: 80px;
        font-size: 16px;
    }
    
    .btn {
        padding: 10px 16px;
        font-size: 0.875rem;
    }
    
    .btn-small {
        padding: 6px 10px;
        font-size: 0.7rem;
    }
    
    .login-container {
        padding: 15px;
    }
    
    .login-box {
        padding: 25px 15px;
    }
    
    .login-box h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 0.9rem;
    }
    
    .modal-content {
        width: 100%;
        margin: 0;
        border-radius: 0;
        height: 100vh;
        max-height: 100vh;
    }
}

/* Overlay per mobile quando sidebar è aperta */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 500;
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
}

.sidebar-overlay.active {
    pointer-events: auto;
}

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

@media (max-width: 768px) {
    .sidebar-overlay.active {
        display: block;
    }
}