:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

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

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-lg);
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-refresh {
    background-color: rgba(255, 255, 255, 0.2);
    border: 2px solid white;
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

/* Tabs */
.tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    background-color: var(--card-bg);
    padding: 10px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.tab-btn {
    flex: 1;
    padding: 12px 24px;
    border: none;
    background-color: transparent;
    color: var(--text-muted);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.tab-btn:hover {
    background-color: var(--bg-color);
}

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

/* Tab Content */
.tab-content {
    display: none;
}

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

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-card h3 {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 10px;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

/* Chart Grid */
.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

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

.chart-card h3 {
    margin-bottom: 20px;
    color: var(--text-color);
    font-weight: 600;
}

/* Data Section */
.data-section {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.data-section h2 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.data-section h3 {
    margin-bottom: 15px;
    color: var(--text-color);
    font-weight: 600;
}

/* Period Selector */
.period-selector {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.period-btn {
    padding: 10px 20px;
    border: 2px solid var(--border-color);
    background-color: white;
    color: var(--text-color);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.period-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

/* Projects List */
.projects-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.project-card {
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateX(5px);
}

.project-card h4 {
    color: var(--text-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.project-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.project-info-item {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.project-info-item strong {
    color: var(--text-color);
}

/* Activity Badge */
.activity-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 10px;
}

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

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

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

.status-poor {
    background-color: #fee2e2;
    color: #991b1b;
}

.text-warning {
    color: var(--warning-color) !important;
    font-weight: 700;
}

/* Gateways List */
.gateways-list {
    display: grid;
    gap: 15px;
}

.gateway-card {
    background-color: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 20px;
    align-items: center;
}

.gateway-info h4 {
    color: var(--text-color);
    margin-bottom: 10px;
    font-family: monospace;
}

.gateway-stats {
    display: flex;
    gap: 20px;
}

.gateway-stat {
    text-align: center;
}

.gateway-stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.gateway-stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.coverage-badge {
    display: inline-block;
    padding: 5px 15px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.coverage-excellent {
    background-color: #dcfce7;
    color: #166534;
}

.coverage-good {
    background-color: #dbeafe;
    color: #1e40af;
}

.coverage-fair {
    background-color: #fef3c7;
    color: #92400e;
}

.coverage-poor {
    background-color: #fee2e2;
    color: #991b1b;
}

/* Form Elements */
.form-group {
    margin-bottom: 20px;
}

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

.form-group select {
    width: 100%;
    max-width: 400px;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

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

/* Loading State */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* Responsive Design */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    .tabs {
        flex-direction: column;
    }

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

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

    .gateway-card {
        grid-template-columns: 1fr;
    }

    .gateway-stats {
        justify-content: space-around;
    }
}

/* Utility Classes */
.text-center {
    text-align: center;
}

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}