.tool-container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 2.2rem;
    background: #fff;
}
.tool-title {
    font-size: 26px;
    font-weight: 600;
    color: #1d2129;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 10px;
}
.tool-title::before {
    content: "🎓";
    font-size: 28px;
}
.filter-group {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 2rem;
    align-items: center;
}
.filter-group select {
    padding: 11px 16px;
    border: 1px solid #e5e6eb;
    border-radius: 10px;
    font-size: 15px;
    outline: none;
    transition: all 0.2s;
    min-width: 180px;
}
.filter-group select:focus {
    border-color: #3370ff;
    box-shadow: 0 0 0 3px rgba(51, 112, 255, 0.12);
}
.table-wrapper {
    width: 100%;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid #f2f3f5;
}
table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}
th {
    background: #f7f8fa;
    padding: 16px;
    text-align: left;
    font-weight: 600;
    color: #4e5969;
    font-size: 15px;
}
td {
    padding: 15px 16px;
    border-top: 1px solid #f2f3f5;
    font-size: 15px;
    color: #1d2129;
}
.tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
}
.tag-blue {
    background: #e8f3ff;
    color: #3370ff;
}
.empty-tip {
    padding: 40px;
    text-align: center;
    color: #86909c;
    font-size: 15px;
}