/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #f4f7fa;
    color: #333;
    line-height: 1.6;
}

header {
    background-color: #0078d4;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 a {
    color: white;
    text-decoration: none;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 4px;
}

nav ul li a.active,
nav ul li a:hover {
    background-color: #005a9e;
}

main {
    padding: 20px;
}

/* Box tìm kiếm */
.search-box {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.search-box h2 {
    margin-bottom: 10px;
}

.search-box label {
    margin-right: 10px;
}

.search-box button {
    background-color: #0078d4;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
}

.search-box button:hover {
    background-color: #005a9e;
}

/* Table */
.table-section {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

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

.table-section th,
.table-section td {
    padding: 10px;
    border-bottom: 1px solid #ddd;
    text-align: left;
}

/* Biểu đồ */
.chart-section {
    background: #fff;
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.chart-section h2 {
    margin-bottom: 15px;
}

.chart-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.chart-box {
    background: #fafafa;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

/* Tổng tiêu thụ */
.summary-section {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.summary-box {
    flex: 1;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.summary-box h3 {
    margin-bottom: 10px;
    color: #0078d4;
}

.summary-box p {
    font-size: 1.5em;
    font-weight: bold;
    color: #333;
}

#exportReportBtn {
    margin-bottom: 15px;
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
}