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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --background: #f1f5f9;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --sidebar-width: 250px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

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

.sidebar-header h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.sidebar-header .date {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 5px;
}

.sidebar-header .user-info {
    color: var(--success-color);
    font-size: 0.8rem;
    margin-top: 8px;
    padding: 5px 10px;
    background: rgba(34, 197, 94, 0.1);
    border-radius: 20px;
    display: inline-block;
}

.nav-menu {
    list-style: none;
    padding: 10px 0;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 100px);
}

.nav-item {
    padding: 15px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s;
    color: var(--text-secondary);
}

.nav-item:hover {
    background: var(--background);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--primary-color);
    color: white;
}

.nav-item .icon {
    font-size: 1.2rem;
}

.nav-item.logout-btn {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    color: var(--danger-color);
}

.nav-item.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

/* Main Content */
.content {
    margin-left: var(--sidebar-width);
    padding: 30px;
    flex: 1;
    width: calc(100% - var(--sidebar-width));
}

.page {
    display: none;
}

.page.active {
    display: block;
}

h1 {
    margin-bottom: 20px;
    color: var(--text-primary);
}

h2 {
    margin-bottom: 15px;
    color: var(--text-primary);
    font-size: 1.2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.stat-icon {
    font-size: 2rem;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--background);
    border-radius: 12px;
}

.stat-info h3 {
    font-size: 1.8rem;
    color: var(--primary-color);
}

.stat-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: var(--background);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

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

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

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

/* Toolbar */
.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

/* Tables */
.contacts-table-container {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background: var(--background);
    font-weight: 600;
    color: var(--text-secondary);
}

.data-table tr:hover {
    background: var(--background);
}

/* Groups Tabs */
.groups-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.group-tab {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    background: var(--card-bg);
    cursor: pointer;
    transition: all 0.2s;
}

.group-tab:hover,
.group-tab.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* Campaigns List */
.campaigns-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.campaign-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.campaign-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.campaign-header h3 {
    font-size: 1.1rem;
}

.campaign-status {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
}

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

.campaign-status.running {
    background: #dcfce7;
    color: #166534;
}

.campaign-status.paused {
    background: #fef3c7;
    color: #92400e;
}

.campaign-status.completed {
    background: #dbeafe;
    color: #1e40af;
}

.campaign-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
}

.campaign-stat {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

/* Progress Bar */
.progress-bar {
    height: 8px;
    background: var(--background);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 15px;
}

.progress-fill {
    height: 100%;
    background: var(--success-color);
    transition: width 0.3s;
}

/* Devices */
.devices-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
}

.device-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.device-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.device-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

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

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

.device-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

/* Info Box */
.info-box {
    background: #dbeafe;
    border: 1px solid #93c5fd;
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
}

.info-box h3 {
    color: #1e40af;
    margin-bottom: 10px;
}

.info-box ol {
    margin-left: 20px;
    color: #1e3a5f;
}

.info-box li {
    margin-bottom: 8px;
}

.info-box code {
    background: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-family: monospace;
}

/* API Info */
.api-info {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.api-endpoint {
    padding: 15px;
    background: var(--background);
    border-radius: 8px;
    margin-bottom: 10px;
}

.api-endpoint code {
    background: white;
    padding: 4px 8px;
    border-radius: 4px;
    font-family: monospace;
}

.api-endpoint p {
    margin-top: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Settings */
.settings-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.settings-section ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.settings-section pre {
    background: var(--background);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: monospace;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-content.modal-large {
    max-width: 700px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

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

/* Forms */
form {
    padding: 20px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
}

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

.char-count {
    text-align: right;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 5px;
}

/* Quick Actions */
.quick-actions {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 30px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.action-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

/* Recent Campaigns */
.recent-campaigns {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: 15px;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 15px 25px;
    border-radius: 8px;
    color: white;
    z-index: 2000;
    animation: slideIn 0.3s ease;
}

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

.toast.error {
    background: var(--danger-color);
}

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

/* Connection Status Box */
.status-box {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 15px 20px;
    margin-bottom: 20px;
    display: flex;
    gap: 30px;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.status-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 500;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #d1d5db;
}

.status-indicator.connected {
    background: var(--success-color);
    box-shadow: 0 0 8px rgba(34, 197, 94, 0.5);
}

.status-indicator.disconnected {
    background: var(--danger-color);
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.5);
}

.status-indicator.warning {
    background: var(--warning-color);
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.5);
}

/* Responsive */
/* History Page */
.history-filters {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.history-filters select,
.history-filters input[type="date"] {
    padding: 10px 15px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    background: var(--card-bg);
}

.history-stats {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.history-stat-item {
    background: var(--card-bg);
    padding: 15px 25px;
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 100px;
}

.history-stat-item .stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
}

.history-stat-item .stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 5px;
}

.history-stat-item.sent .stat-value {
    color: var(--success-color);
}

.history-stat-item.failed .stat-value {
    color: var(--danger-color);
}

.history-table-container {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.message-cell {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: help;
}

.pagination {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}

.pagination-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.pagination-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Status colors for history */
.campaign-status.pending {
    background: #f1f5f9;
    color: #64748b;
}

.campaign-status.sending {
    background: #fef3c7;
    color: #92400e;
}

.campaign-status.sent {
    background: #dcfce7;
    color: #166534;
}

.campaign-status.delivered {
    background: #dbeafe;
    color: #1e40af;
}

.campaign-status.failed {
    background: #fef2f2;
    color: #dc2626;
}

/* Campaign Progress Overlay */
.campaign-progress-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 3000;
}

.campaign-progress-content {
    background: white;
    padding: 30px 50px;
    border-radius: 16px;
    text-align: center;
    max-width: 400px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.campaign-progress-content h3 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.campaign-progress-content .progress-bar {
    background: var(--background);
    border-radius: 10px;
    overflow: hidden;
}

.campaign-progress-content .progress-fill {
    background: linear-gradient(90deg, var(--primary-color), var(--success-color));
    transition: width 0.3s ease;
}

@media (max-width: 768px) {
    .sidebar {
        width: 60px;
    }

    .sidebar-header h2,
    .sidebar-header .date,
    .nav-item span:not(.icon) {
        display: none;
    }

    .content {
        margin-left: 60px;
        width: calc(100% - 60px);
        padding: 15px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .campaign-stats {
        flex-wrap: wrap;
    }
}