:root {
    --primary-color: #3498db;
    --primary-dark: #2980b9;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --text-color: #2c3e50;
    --text-light: #7f8c8d;
    --bg-color: #f5f7fa;
    --card-color: #ffffff;
    --border-color: #e0e0e0;
    --hover-color: #f1f7fd;
    --even-row: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: var(--card-color);
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

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

h1 {
    color: var(--text-color);
    margin-bottom: 5px;
    font-size: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.subtitle {
    color: var(--text-light);
    font-size: 14px;
    margin-bottom: 15px;
}

.controls {
    display: flex;
    justify-content: space-between;
    margin-bottom: 25px;
    flex-wrap: wrap;
    gap: 15px;
}

.search-container {
    position: relative;
    flex-grow: 1;
    max-width: 400px;
}

.search-container i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
}

.search-box {
    padding: 10px 15px 10px 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    width: 100%;
    font-size: 14px;
    transition: border 0.3s, box-shadow 0.3s;
}

.search-box:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

.refresh-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.refresh-btn:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.table-container {
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    max-height: calc(100vh - 250px);
    overflow-y: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 600px;
}

th, td {
    border: 1px solid var(--border-color);
    padding: 12px 15px;
    text-align: left;
}

th {
    background-color: var(--primary-color);
    color: white;
    position: sticky;
    top: 0;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 13px;
    letter-spacing: 0.5px;
}

tr:nth-child(even) {
    background-color: var(--even-row);
}

tr:hover {
    background-color: var(--hover-color);
}

.loading-message {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.loading-message i {
    font-size: 24px;
    color: var(--primary-color);
}

.error-message {
    text-align: center;
    padding: 30px;
    color: var(--danger-color);
    font-weight: bold;
}

.positive {
    color: var(--success-color);
    font-weight: 500;
}

.negative {
    color: var(--danger-color);
    font-weight: 500;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .container {
        padding: 15px;
        border-radius: 8px;
    }
    
    h1 {
        font-size: 22px;
    }
    
    .controls {
        flex-direction: column;
        gap: 10px;
    }
    
    .search-container {
        max-width: 100%;
    }
    
    .refresh-btn {
        width: 100%;
        justify-content: center;
    }
    
    .table-container {
        border-radius: 6px;
        max-height: calc(100vh - 200px);
    }
    
    th, td {
        padding: 10px 12px;
        font-size: 13px;
    }
}

@media (max-width: 480px) {
    th, td {
        padding: 8px 10px;
        font-size: 12px;
    }
    
    .loading-message {
        padding: 30px 15px;
    }
}