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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    min-height: 100vh;
    color: #333;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header h1 {
    font-size: 1.8rem;
    margin-bottom: 0.25rem;
}

.header p {
    opacity: 0.9;
    font-size: 0.9rem;
}

.container {
    max-width: 2000px;
    margin: 0 auto;
    padding: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    border-left: 4px solid;
}

.stat-card.total { border-left-color: #3b82f6; }
.stat-card.sent { border-left-color: #10b981; }
.stat-card.pending { border-left-color: #f59e0b; }
.stat-card.failed { border-left-color: #ef4444; }

.stat-card h3 {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.stat-card .number {
    font-size: 2rem;
    font-weight: bold;
    margin-bottom: 0.25rem;
}

.stat-card.total .number { color: #3b82f6; }
.stat-card.sent .number { color: #10b981; }
.stat-card.pending .number { color: #f59e0b; }
.stat-card.failed .number { color: #ef4444; }

.controls {
    background: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    align-items: center;
    flex-wrap: wrap;
}

.refresh-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.refresh-btn:hover {
    transform: translateY(-2px);
}

.search-box {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem;
    border: 2px solid #e5e7eb;
    border-radius: 8px;
    font-size: 1rem;
}

.search-box:focus {
    outline: none;
    border-color: #667eea;
}

.data-table {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    overflow: hidden;
}

.table-header {
    background: #f8fafc;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid #e5e7eb;
    font-weight: 600;
    color: #374151;
}

.table-content {
    max-height: 600px;
    overflow-y: auto;
}

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

th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #f3f4f6;
}

th {
    background: #f8fafc;
    font-weight: 600;
    color: #374151;
    position: sticky;
    top: 0;
    z-index: 10;
}

tbody tr:hover {
    background: #f9fafb;
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.status-sent {
    background: #d1fae5;
    color: #065f46;
}

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

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

.loading {
    text-align: center;
    padding: 2rem;
    color: #666;
}

.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 10px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.last-updated {
    color: #666;
    font-size: 0.9rem;
    margin-left: auto;
}

.qr-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

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

.no-qr {
    color: #666;
    font-style: italic;
}