:root {
    --bg-color: #f4f7fc;
    --card-bg-color: #ffffff;
    --primary-text-color: #1a202c;
    --secondary-text-color: #718096;
    --accent-color-1: #4A55E1;
    --accent-color-2: #38B2AC;
    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.05);
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--primary-text-color);
    line-height: 1.6;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

header {
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

header h1, .card h2, .analysis-section h2, .kpi-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
}

header h1 {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary-text-color);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.btn.download-btn {
    background-color: var(--accent-color-2);
    color: white;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.2s ease;
}

.btn.download-btn:hover {
    background-color: #2c9e99;
}

.filter-container {
    display: flex;
    align-items: center;
    gap: 10px;
    background-color: var(--card-bg-color);
    padding: 8px 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

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

.filter-container select {
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--primary-text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    cursor: pointer;
}

.card {
    background-color: var(--card-bg-color);
    border-radius: 12px;
    padding: 25px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px -1px var(--shadow-color), 0 2px 4px -1px var(--shadow-color);
    transition: transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px var(--shadow-color), 0 4px 6px -2px var(--shadow-color);
}

.card h2 {
    margin-bottom: 20px;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--secondary-text-color);
}

.kpi-grid, .analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.kpi-card h3, .analysis-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--secondary-text-color);
    margin-bottom: 8px;
}

.kpi-card p {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--accent-color-1);
}

.analysis-section {
    margin-bottom: 30px;
}

.analysis-section h2 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.analysis-card {
    padding: 20px;
    background-color: var(--card-bg-color);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.analysis-card .value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-color-2);
}

.analysis-card .label {
    font-size: 0.9rem;
    color: var(--secondary-text-color);
}

.analysis-card .details {
    margin-top: 15px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.full-width {
    grid-column: 1 / -1;
}

.chart-container {
    position: relative;
    height: 350px;
    width: 100%;
}

canvas {
    width: 100% !important;
    height: 100% !important;
}

#salesDataTable {
    border-collapse: collapse !important;
    width: 100% !important;
}

#salesDataTable th, #salesDataTable td {
    color: var(--primary-text-color);
    padding: 12px 15px;
}

#salesDataTable th {
    background-color: var(--bg-color);
    font-weight: 600;
}

#salesDataTable td {
    border-top: 1px solid var(--border-color);
}

.dataTables_wrapper .dataTables_length,
.dataTables_wrapper .dataTables_filter,
.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate {
    color: var(--secondary-text-color) !important;
    margin-bottom: 15px;
}

.dataTables_wrapper .dataTables_length select,
.dataTables_wrapper .dataTables_filter input {
    background-color: var(--bg-color) !important;
    color: var(--primary-text-color) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 6px;
    padding: 5px;
}

.dataTables_wrapper .paginate_button {
    color: var(--secondary-text-color) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 6px !important;
    margin: 0 3px !important;
}

.dataTables_wrapper .paginate_button.current,
.dataTables_wrapper .paginate_button.current:hover {
    background: var(--accent-color-1) !important;
    color: white !important;
    border-color: var(--accent-color-1) !important;
}

.dataTables_wrapper .paginate_button:hover {
    background: var(--bg-color) !important;
    border-color: var(--border-color) !important;
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--secondary-text-color);
}

@media (max-width: 992px) {
    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 20px;
    }
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}