body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #fff;
    color: #333;
}
.header {
    display: flex;
    align-items: center;
    padding: 10px 20px;
    border-bottom: 1px solid #ddd;
}
.header-logo {
    font-size: 20px;
    font-weight: bold;
    margin-right: 30px;
}
.header-nav {
    display: flex;
    gap: 20px;
}
.header-nav a {
    text-decoration: none;
    color: #1a73e8;
    font-size: 14px;
    font-weight: bold;
    padding: 20px 5px;
    border-bottom: 3px solid transparent;
}
.header-nav a.active {
    color: #1a73e8;
    border-bottom: 3px solid #1a73e8;
}
.user-info {
    margin-left: auto;
    font-size: 14px;
    font-weight: bold;
}
.container {
    padding: 20px;
    padding-bottom: 100px; /* Space for fixed bottom bar */
    max-width: 1400px;
    margin: auto;
}
.settings-bar {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
    align-items: center;
    background-color: #f8f9fa;
    padding: 15px;
    border-radius: 6px;
    border: 1px solid #ddd;
}
.settings-bar input[type="text"] {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}
.settings-bar button {
    padding: 10px 20px;
    background-color: #1a73e8;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
}
.settings-bar button:hover {
    background-color: #1557b0;
}
.settings-bar button:disabled {
    background-color: #aaa;
    cursor: not-allowed;
}
h2 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #000;
}
.search-box {
    width: 100%;
    padding: 12px;
    background-color: #f8f9fa;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
    margin-bottom: 20px;
    font-size: 14px;
    outline: none;
}
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
th, td {
    border: 1px solid #dee2e6;
    padding: 12px;
    text-align: center;
    vertical-align: middle;
}
th {
    color: #1a73e8;
    font-weight: bold;
    background-color: #fff;
}
td.text-left {
    text-align: left;
}
tr:nth-child(even) {
    background-color: #f8f9fa;
}
.text-blue {
    color: #666;
}
.checkbox-col {
    width: 40px;
}
.highlight-red {
    color: red;
    font-weight: bold;
}
.highlight-green {
    color: green;
    font-weight: bold;
}

/* CSS cho nút xoá lớp */
.btn-delete {
    background: #dc3545;
    color: white;
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 16px;
    line-height: 1;
}
.btn-delete:hover {
    background: #c82333;
}

/* Bottom Selected Bar */
.selected-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #fdfdfd;
    padding: 10px 20px;
    border-top: 1px solid #ddd;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    display: none; /* Hide when nothing selected */
    align-items: center;
    justify-content: space-between;
    z-index: 100;
}
.selected-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    flex: 1;
    margin-right: 20px;
    max-height: 80px;
    overflow-y: auto;
}
.chip {
    border: 1px solid #ccc;
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 13px;
    background: #fff;
    display: flex;
    align-items: center;
    gap: 6px;
    color: #555;
}
.chip-close {
    cursor: pointer;
    color: #999;
    font-weight: bold;
    font-size: 14px;
}
.chip-close:hover {
    color: red;
}
.btn-register-teal {
    background: #459a8e;
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: bold;
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
}
.btn-register-teal:hover {
    background: #367c72;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    align-items: center;
    justify-content: center;
}
.modal-content {
    background-color: #fff;
    padding: 20px;
    border-radius: 8px;
    width: 500px;
    max-width: 90%;
    position: relative;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
    color: #888;
}
.modal-close:hover {
    color: #000;
}
.modal h3 {
    text-align: center;
    margin-top: 0;
    font-size: 18px;
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
}
.result-group {
    margin-top: 15px;
}
.result-title {
    font-weight: bold;
    font-size: 15px;
    margin-bottom: 5px;
}
.result-title.success { color: #1a73e8; }
.result-title.error { color: #dc3545; }
.result-list {
    font-size: 14px;
    color: #555;
    margin-left: 10px;
    line-height: 1.6;
}